KR20150099386A - Washing apparatus and controlling method thereof - Google Patents

Abstract

The present invention relates to a washing apparatus and controlling method thereof comprising: an AC motor which generating turning force; the clutch unit selectively transmitting a rotational forces to the rotating set and a pulsator ; a speed detecting part detecting unit at least one rotation velocity in the AC motor and the clutch unit; ,and a control unit which repeating the supply or interruption of the power to the AC motor according to the rotative velocity. thus, enabling control the supply or interruption of the power of the AC motor on the basis of the rotation velocity.

Description

[0001] WASHING APPARATUS AND CONTROLLING METHOD THEREOF [0002]

The disclosed invention relates to a washing machine and a control method thereof, and is an invention related to a washing machine including a non-controlled type driving motor and a control method thereof.

Generally, a washing machine is a device for washing clothes using frictional force between laundry and water, and can be classified into a front load type washing machine and a top load type washing machine.

The front load type washing machine is washed by using the fall of the laundry while the rotary tub which accommodates the laundry is rotated. The top load type washing machine has a rotary tub which accommodates laundry, and a pulsator which generates water flow on the bottom of the rotary tub , Washing is performed using the water stream generated by the pulsator.

In addition, both the front load type washing machine and the top load type washing machine dehydrate the laundry using the centrifugal force by rotating the rotary tub.

In this way, the washing machine operates by using the rotation of the rotating drum or pulsator, and the washing machine widely uses the motor as a device for providing rotational force to the rotating drum or pulsator.

The motor widely used in the washing machine can be largely divided into a control type motor (so-called servo motor) for precisely controlling the rotation speed of the motor and an uncontrolled type motor for controlling the rotation speed of the motor.

The control type motor includes a speed sensor for detecting the rotational speed of the motor and a current sensor for detecting the driving current of the motor, and precisely controls the driving current according to the rotational speed of the detected motor. This control type motor can precisely control the rotation speed of the motor regardless of the load.

On the contrary, the non-control type motor generally controls the rotation of the motor through the ON time at which the power is supplied to the motor and the OFF time at which the power supply to the motor is interrupted. Such unregulated motors are relatively inexpensive.

When the washing machine includes an uncontrolled motor, it is difficult to precisely control the rotational speed of the motor, and there is a possibility that the resonance phenomenon continuously occurs during the dewatering stroke. Here, the resonance phenomenon refers to a phenomenon in which the rotational frequency of the rotating tub is equal to the rotational frequency of the motor during the spin-drying cycle, and the rotating tub is vibrated very heavily.

Conventionally, in the case of a washing machine using a non-control type motor, since the rotation of the rotating tub is controlled only through the ON time and the OFF time of the motor, the rotational speed of the rotating tub is difficult to avoid resonance transmission of the rotating tub.

In order to solve the above problems, an aspect of the disclosed invention is to provide a washing machine and a control method thereof, which minimizes a resonance phenomenon during a dewatering cycle in a washing machine including an uncontrolled motor.

According to an aspect of the present invention, there is provided a washing machine comprising: an AC motor for generating a rotating force; a clutch unit for selectively transmitting the rotating force to a rotating tank and pulsator; a speed detecting unit for detecting a rotating speed of at least one of the AC motor and the clutch unit; And an intermittent dewatering operation for repeating power supply to the AC motor and interrupting power supply according to the rotation speed.

According to an embodiment of the present invention, the controller may interrupt power supply to the AC motor when the rotation speed is higher than the upper limit speed, and may supply power to the AC motor when the rotation speed is lower than the lower limit speed.

Also, according to the embodiment, the upper limit speed and the lower limit speed may be higher than the resonance speed of the rotating bath.

Also, according to the embodiment, the upper limit speed and the lower limit speed may be a speed between the first resonance speed and the second resonance speed of the rotating bath.

Further, according to the embodiment, the controller may further perform the main dewatering operation in which the power is continuously supplied to the AC motor during a predetermined dewatering time during the dewatering stroke.

According to an embodiment of the present invention, when the washing speed is higher than the reference washing speed, the control unit interrupts the supply of power to the AC motor and, when the reference waiting time elapses, the AC motor is rotated in the opposite direction, So that the washing operation can be performed.

According to an embodiment of the present invention, when the rotational speed is equal to or greater than the reference wash rate, the control unit interrupts power supply to the alternating-current motor, and when the rotational speed becomes "0 & And a washing operation for supplying power to the AC motor can be performed.

According to an embodiment of the present invention, the washing machine further includes a pulley unit including a driving pulley coupled to a rotating shaft of the AC motor, a driven pulley coupled to a rotation shaft of the clutch unit, and a pulley belt transmitting rotational force of the driving pulley to the driven pulley. As shown in FIG.

According to the embodiment, the speed detecting portion may include a position indicating member rotating together with the driven pulley, and a speed detecting sensor fixed to the clutch unit and detecting the position indicating member.

The velocity detecting unit may include a position indicating member rotated together with the driving pulley, and a velocity detecting sensor fixed to the driving unit and detecting the position indicating member.

According to another aspect of the present invention, there is provided a method of controlling a washing machine including an alternating-current motor for generating a rotating force and a clutch unit for selectively transmitting the rotating force to a rotating tank and a pulsator, Detecting at least one rotational speed and repeating power supply to the alternating-current motor and disconnection of the power supply in accordance with the rotational speed during a dehydration stroke.

According to an embodiment of the present invention, power supply to the alternating-current motor and interrupting power supply are interrupted. When the rotational speed is higher than the upper limit speed, power supply to the alternating-current motor is interrupted. Lt; / RTI >

Also, according to the embodiment, the upper limit speed and the lower limit speed may be higher than the resonance speed of the rotating bath.

Also, according to the embodiment, the upper limit speed and the lower limit speed may be a speed between the first resonance speed and the second resonance speed of the rotating bath.

In addition, repeating the power supply to the AC motor and the power supply interception according to the embodiment may further include continuously supplying power to the AC motor during a predetermined dewatering time.

According to another aspect of the present invention, there is provided a control method for a washing machine, comprising: stopping supply of power to the AC motor when the rotation speed is equal to or higher than a reference wash rate during a washing cycle; and supplying power to the AC motor Quot;

According to another aspect of the present invention, there is provided a washing machine including an AC motor for generating a rotating force, a washing mode for transmitting the rotating force to the pulsator, a clutch unit for operating the dewatering mode for transmitting the rotating force to the rotating tank and the pulsator, A drain valve for opening and closing a drain pipe for discharging water; a drain valve for opening and closing the drain valve when the water level of the water tank reaches a reference water level, and switching the operation mode of the clutch unit to a dehydration mode, The reference level may be lower than the bottom of the rotating tub and higher than the bottom of the tub.

The washing machine may further include a drain motor for driving the drain valve, and a mode switching motor for switching an operation mode of the clutch unit.

According to an embodiment of the present invention, the washing machine further includes a speed detecting unit that detects a rotating speed of at least one of the AC motor and the clutch unit, and the control unit reopens the drain valve when the rotating speed reaches a residual water discharging speed .

According to the embodiment, the residual water discharge speed may be changed according to the amount of the laundry accommodated in the rotary tub.

According to an embodiment, the residual water discharge rate may be the same as the resonance frequency of the rotating bath.

According to an embodiment of the present invention, the controller may interrupt power supply to the AC motor when the rotation speed is equal to or higher than the upper limit speed, and the residual discharge speed may be equal to the upper limit speed.

According to an embodiment, the residual water discharge rate may be smaller than the resonance frequency of the rotating bath.

According to an aspect of the disclosed invention, in a washing machine including an uncontrolled motor, the rotation speed of a motor or rotary tub is detected, and on / off of the motor is controlled in accordance with the detected rotation speed to minimize resonance during dehydration A washing machine can be provided.

According to another aspect of the disclosed invention, there is provided a washing machine for reducing vibration of a water tub by rotating a rotating tub by leaving residual water in the tub during a dewatering operation.

1 shows a side cross-section of a washing machine according to an embodiment.
2 shows the bottom of the washing machine according to one embodiment.
Fig. 3 is an enlarged view of the area A in Fig.
Fig. 4 is an enlarged view of the area B in Fig.
5 is a bottom view of a water tank included in a washing machine according to an embodiment of the present invention.
6 shows a driving circuit of the driving motor included in the washing machine according to the embodiment.
7 shows a control configuration of a washing machine according to an embodiment.
FIG. 8 shows a configuration of a speed detector included in the washing machine according to an embodiment.
9 to 13 illustrate an example of the arrangement of the speed detector included in the washing machine according to the embodiment.
14 shows the operation of the washing machine according to an embodiment.
15 shows a washing operation of the washing machine according to an embodiment.
16 shows a driving signal and a rotational speed by the washing operation of the washing machine according to the embodiment.
Fig. 17 shows a driving signal and a rotational speed by an intermittent dewatering operation according to the prior art.
18 shows an intermittent dewatering operation of the washing machine according to an embodiment.
19 shows a driving signal and a rotational speed by the intermittent dewatering operation of the washing machine according to the embodiment.
FIG. 20 shows the rotational speed of the washing machine according to the amount of laundry in an embodiment.
21 shows a side cross-section of a washing machine according to another embodiment.
Fig. 22 shows a bottom portion of a washing machine according to another embodiment.
FIG. 23 shows a ball balancer included in a washing machine according to another embodiment.
Fig. 24 shows the II 'cross-section shown in Fig.
Fig. 25 is an enlarged view of the area C shown in Fig.
26 shows a bottom surface of a water tank included in a washing machine according to another embodiment.
Fig. 27 shows a control configuration of a washing machine according to another embodiment.
28 illustrates a method of washing laundry in a washing machine according to another embodiment.
29 shows the vibration of the water tank during the dehydration and dehydration stages.
30 and 31 show an example of a dewatering cycle of the washing machine according to another embodiment.
Fig. 32 shows the level of the remaining water in the water tank during the dehydration stroke shown in Figs. 30 and 31. Fig.
33 to 35 show an example of the opening / closing of the drain valve according to the rotational speed of the rotating tub during the dewatering process of the washing machine according to another embodiment.
36 and 37 show another example of the dewatering stroke of the washing machine according to another embodiment.
Fig. 38 shows the water level of the water for untangling laundry during the dewatering process shown in Figs. 36 and 37. Fig.
FIG. 39 shows an example of a washing operation in which the washing machine according to another embodiment of the present invention is used to wash the water tub and the rotating tub.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, as claimed, and it is to be understood that the invention is not limited to the disclosed embodiments.

In addition, the same reference numerals or signs shown in the respective figures of the present specification indicate components or components performing substantially the same function.

Also, terms including ordinals such as " first ", " second ", etc. can be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term " and / or " includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Also, the terms used herein are used to illustrate the embodiments and are not intended to limit and / or limit the disclosed invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. Like reference numerals in the drawings denote members performing substantially the same function.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a side sectional view of a washing machine according to an embodiment of the present invention, and FIG. 2 is a bottom view of a washing machine according to an embodiment of the present invention.

1 and 2, a washing machine 1 includes a cabinet 10 for forming an outer appearance, a water tank 20 for containing water, a rotary tub 30 rotatably arranged in the water tub 20, A pulsator 40 for generating a water flow in the tank 30, a water supply unit 50 for supplying water to the water tank 20, a detergent supply unit 60 for supplying detergent to the rotary tank 30, A drainage unit 70 for discharging water contained in the rotary tub 30 and a rotary drive unit 100 for selectively rotating the rotary tub 30 and the pulsator 40.

The cabinet 10 is provided at its upper portion with a charging port 11 for allowing laundry to be charged into the rotary tub 30 and the charging port 11 is opened and closed by a door 13 provided at an upper portion of the cabinet 10. [ do.

The water tank 20 may be configured in a cylindrical shape with its top opened to allow laundry to be introduced later.

A drainage port 20a for discharging the water contained in the water tank 20 is provided on the bottom surface of the water tank 20 and an overflow pipe 20b for draining the water stored at a predetermined level or more is provided on the side surface of the water tank 20 .

The water tub 20 is supported by the damper 21 in a state of being caught in the cabinet 10 and the damper 21 is generated in the water tub 20 when the rotary tub 30 or the pulsator 40 rotates And is provided between the outer surface of the water tub 20 and the inner surface of the cabinet 10. [

A water level sensing pipe 22b and a pressure sensor 22a for determining the level of water contained in the water tank 20 may be installed near the water tank 20. [ The water level sensing pipe 22b extends from the bottom of the water tank 20 to the upper portion of the water tank 20 and a pressure sensor 22a is installed at one end of the water level sensing pipe 22b.

The water level sensing tube 22b receives water of the same level as the water level of the water tank 20 and the pressure inside the water level sensing tube 22b changes according to the water level of the water level sensing tube 22b. Specifically, if the water level in the water level sensing pipe 22b is high, the pressure inside the water level sensing pipe 22b is increased. If the water level in the water level sensing pipe 22b is low, the pressure inside the water level sensing pipe 22b is decreased.

The pressure sensor 22a detects the pressure inside the water level sensing pipe 22b to be converted according to the water level of the water level sensing pipe 22b and outputs an electrical signal corresponding to the detected pressure. The water level of the water level sensing pipe 22b is equal to the water level of the water tank 20 so that the pressure sensor 22a outputs an electrical signal corresponding to the water level of the water tank 20. [

The rotary tub 30 may be formed in a cylindrical shape with its top opened to allow the laundry to be introduced later, and is rotatably provided in the tub 20.

A plurality of dewatering holes 31 are formed in the side surface of the rotary tub 30 so that the inner space of the rotary tub 30 and the inner space of the tub 20 .

A balancer 33 for canceling the unbalanced load generated in the rotary tub 30 during the rotation of the rotary tub 30 is mounted on the upper portion of the rotary tub 30 so that the rotary tub 30 can be rotated stably do.

The pulsator (40) may be provided inside the bottom surface of the rotary tub (30) and rotates in the forward or reverse direction to generate water flow. The laundry in the rotary tub 30 is stirred together with the water by the water stream generated by the pulsator 40 and the laundry is washed by the friction between the laundry and the water.

The water supply unit 50 is provided at an upper portion of the water tank 20 and supplies water into the water tank 20 from an external water supply source (not shown).

The water supply unit 50 includes a water supply pipe 51 for guiding water from an external water supply source (not shown) to the water tank 20 and a water supply valve 53 provided on the water supply pipe 51 for opening and closing the water supply pipe 51 .

Particularly, the water pipe 51 is connected to a detergent supply unit 60, which is one end of the water pipe 51, so that the water guided by the water pipe 51 is supplied to the water tank 20 via the detergent supply unit 60.

The detergent supply part 60 includes a detergent case 63 for receiving the detergent, and a detergent case 61 for receiving the detergent case 63.

The detergent case 61 is fixed to the cabinet 10 and is connected to one end of the water supply pipe 51 described above. The bottom surface of the detergent case 61 is provided with a discharge port 61a for discharging water via the detergent supply unit 60 to the water tank 20. [

The detergent box 63 is provided corresponding to the water supply pipe 51 so that the water supplied through the water supply pipe 51 is mixed with the detergent contained in the detergent box 63.

The detergent box 63 is detachably mounted to the detergent case 61 so that the user can push the detergent box 63 out of the detergent case 61 and inject the detergent into the detergent box 63 .

In this way, the water supplied by the water supply unit 50 is mixed with the detergent contained in the detergent box 63 while passing through the detergent box 63, and the water mixed with the detergent is mixed into the bottom of the detergent case 61 And is supplied to the water tub 20 through the discharge port 61a provided.

The drainage unit 70 may be provided below the water tank 20 to discharge the water contained in the water tank 20 to the outside of the cabinet 10.

The drainage unit 70 includes a first drain pipe 71 for guiding the water contained in the water tank 20 to the outside of the water tank 20, a drain valve 72 for opening and closing the first drain pipe 71, a drain valve 72 A second drain pipe 74 for guiding the water that has passed through the drain motor 73 and the drain valve 72 to the outside of the cabinet 10 to be driven and a third drain pipe 74 for guiding water overflowed over a certain water level to the drain pipe 72, And a drain pipe (75).

One end of the first drain pipe 71 is connected to a drain hole 20a provided on the bottom of the water tank 20 and the other end thereof is connected to the drain valve 72.

The drain valve 72 is provided at one end of the first drain pipe 71 and opens and closes the first drain pipe 71. Specifically, when the drain valve 72 is opened, the water in the water tank 20 can be discharged to the outside through the first drain pipe 71.

The opening and closing of the drain valve 72 can receive the driving force from the drain motor 73 through the link wire.

The drain motor 73 drives the opening and closing of the drain valve 72 through the link wire. For example, when the drain motor 73 is activated, the drain valve 72 is opened, the water in the water tank 20 is drained, and the drain valve 73 is closed, the drain valve 73 can be closed .

One end of the second drain pipe 74 is connected to the drain valve 72 and the other end of the second drain pipe 74 extends to the outside of the cabinet 10. The water discharged through the first drain pipe 71 and the third drain pipe 75, (10).

The third drain pipe (75) is provided on the side surface of the water tank (20) and connects the overflow pipe (20b) and the second drain pipe (74).

The rotary drive unit 100 is provided below the water tub 20 and selectively provides rotational force to the rotary tub 30 or pulsator 40. [ Specifically, the rotary drive unit 100 provides a forward or reverse rotational force to the pulsator 40 in the washing and rinsing cycles, and provides a reverse rotational force to the rotary tub 30 and pulsator 40 in the dehydrating cycle .

The rotation drive unit 100 will be described in detail below.

FIG. 3 is an enlarged view of a region A in FIG. 1, FIG. 4 is an enlarged view of a region B in FIG. 2, and FIG. 5 is a bottom view of a water tank included in a washing machine according to an embodiment. 6 shows the construction of a driving motor included in the washing machine according to an embodiment of the present invention, and FIG. 7 shows a driving circuit of a driving motor included in the washing machine according to an embodiment.

3 to 7, the rotation driving unit 100 includes a driving motor 110 for generating a rotational force, and a driving motor 110 for selectively providing the rotational force transmitted from the driving motor 110 to the rotary tub 30 and the pulsator 40 And a pulley unit 130 for transmitting the rotational force generated by the drive motor 110 to the clutch unit 120. [

The driving motor 110 includes a motor casing 111 that forms an outer surface of the driving motor 110, a stator 112 that generates a rotating magnetic field, a rotor 113 that rotates by a rotating magnetic field, And a motor rotation shaft 115 coupled with the rotor 113 to rotate together with the rotor 113. The drive motor 110 generates a rotational force for rotating the rotary tub 30 and pulsator 40. [

The stator 112 is fixed inside the motor casing 111 and may have a hollow cylindrical shape. Further, the stator 112 includes a coil that generates a rotating magnetic field when electric current is conducted, and the coil is disposed along the inner circumferential surface of the stator 112.

The rotor 113 is rotatably provided inside the stator 112 and rotates by interaction with the rotating magnetic field generated by the stator 112. [

The motor rotating shaft 115 is coupled to the rotor 113 and rotates together with the rotor 113 to transmit the rotational force of the rotor 113 to a pulley unit 130 to be described later.

The driving motor 110 generates an induction current in the rotor 113 by a rotating magnetic field generated by the stator 112 and generates an interaction between a magnetic field generated by the induction current and a rotating magnetic field generated by the stator 112 An induction motor (IM) in which the rotor 113 rotates can be employed.

However, the driving motor 110 included in the washing machine 1 according to the embodiment is not limited to the induction motor. For example, the drive motor 110 may employ a synchronous motor (SM) in which the rotor 113 includes a permanent magnet generating a magnetic field. However, it is assumed that the driving motor 110 included in the washing machine 100 according to an embodiment employs an induction motor.

Further, the washing machine 1 does not include a separate speed control circuit for controlling the rotational speed of the driving motor 110. [ 6, the washing machine 1 supplies the external power source ES to the driving motor 110 directly to the driving motor 110 and drives the driving motor 110 to turn on or off the driving motor 110, (S1).

Specifically, when the drive switch S1 is turned on, power is supplied to the drive motor 110 to drive the drive motor 110. When the drive switch S1 is turned off, The power supply is interrupted and the drive motor 110 stops. In other words, the washing machine 1 can control the driving and stopping of the driving motor 110, and does not control the rotational speed of the driving motor 110. [

The clutch unit 120 includes a clutch housing 121, a switching gear 122, a reduction gear 123, a clutch lever 124, a brake belt 126, and a clutch lever 127. The clutch unit 120 may operate in a washing mode for transmitting the rotational force of the driving motor 120 to the pulsator 40 and a dehydrating mode for transmitting the rotational force to the rotating tub 30 and the pulsator 40 .

The clutch housing 121 forms the outer surface of the clutch unit 120 and accommodates the switching gear 122 and the reduction gear 123 therein.

The clutch rotation shaft 125 receives the rotational force of the driving motor 110 from a pulley unit 130 to be described later and transmits the transmitted rotational force to the switching gear 122.

The switching gear 122 is connected to the rotating shoe rotation shaft 35 connected to the rotary shoe 30 and the pulsator rotation shaft 45 connected to the pulsator 40 according to the operation of the washing machine 1. [ ).

More specifically, the switching gear 122 transmits the rotational force of the clutch rotational shaft 125 to the pulsator rotational shaft 45 or the rotational force of the clutch rotational shaft 125 to the pulsator rotational shaft 45 in accordance with the operation of the clutch lever 124, And the rotary tubular rotary shaft 35, respectively.

The clutch lever 124 is connected to the above-described drain motor 73 to control the operation of the switching gear 122 in accordance with the operation of the drain motor 73.

The clutch lever 124 may be located at the first position P1 or the second position P2 as shown in Fig. 6, depending on the operation of the drain motor 73. Fig. Specifically, when the drain motor 73 is activated, the clutch lever 124 is located at the second position P2, and when the drain motor 73 is not operated, the clutch lever 124 is located at the first position P1 .

Further, the clutch lever 124 can control the operation of the switching gear 122 in accordance with the positions P1 and P2 thereof.

Specifically, when the clutch lever 124 is in the first position P1, the switching gear 122 transmits the rotational force of the clutch rotational shaft 125 to the pulsator rotational shaft 45. [ When the clutch lever 124 is in the second position P2, the switching gear 122 can transmit the rotating force of the clutch rotating shaft 125 to both the pulsator rotation shaft 45 and the rotating shaft rotation shaft 35.

As a result, when the drain motor 73 is operated, only the pulsator 40 rotates, and when the drain motor 73 is not operated, the pulsator 40 and the rotary tub 30 can rotate together.

The decelerating gear 123 decelerates the rotational force of the clutch rotational shaft 125 in the washing mode and provides the rotational speed of the clutch rotational shaft 125 to the pulsator rotational shaft 45 in the dehydrating mode, to provide.

Specifically, when the rotating shafts 35 are fixed, the reduction gear 123 decelerates the rotational force of the clutch rotating shaft 125 to provide the pulsating shafts 45 to the pulsator rotation shafts 45, The reduction gear 123 provides the rotational force of the clutch rotation shaft 125 to the pulsator rotation shaft 45 and the rotation shaft rotation shaft 35 as it is.

The brake belt 126 is used to fix the rotary shaft 35 so that the rotary shaft 35 can not rotate in accordance with the operation of the clutch lever 127, Release the rotary shaft (35).

As described above, the clutch lever 127 is connected to the drain motor 73, and the brake belt 126 can be operated according to the operation of the drain motor 73.

When the clutch lever 127 is in the first position P1, the brake belt 126 fixes the rotary hinge rotation axis 35 and when the clutch lever 127 is in the second position P2, the brake belt 127 ) Releases the rotary shaft (35). If the drain motor 73 is not operated as described above, the clutch lever 124 is located at the first position P1. When the drain motor 73 is operated, the clutch lever 124 is moved to the second position P2. .

Accordingly, when the drain motor 73 is not operated, the brake belt 126 fixes the rotary shaft rotation shaft 35, and when the drain motor 73 is operated, the brake belt 126 releases the rotary shaft rotation shaft 35 .

As a result, if the drain motor 73 is not operated, only the pulsator 40 can rotate, and when the drain motor 73 is operated, the pulsator 40 and the rotary tub 30 can rotate together.

In this manner, the operation mode of the clutch unit 120 'is switched depending on whether the drain motor 73 is operated or not. In other words, when the drain motor 73 is activated, the clutch unit 120 'operates in the dehydration mode, and if the mode switching motor 129 is not operated, the clutch unit 120' operates in the washing mode.

Further, the clutch unit 120 is switched to the operation mode according to the drain operation. Specifically, when the drainage operation is performed, the clutch unit 120 operates in the dewatering mode, and if the drainage operation is not performed, the clutch unit 120 operates in the washing mode.

The pulley unit 130 includes a drive pulley 131 coupled to the motor rotation shaft 115 of the drive motor 110, a driven pulley 133 coupled to the clutch rotation shaft 125 of the clutch unit 120, And a pulley belt 132 for transmitting the rotational force of the driven pulley 133 to the driven pulley 133.

The drive motor 110 generates a rotational force using an AC power supplied from an external power source and transmits the generated rotational force to the pulley unit 130. [ The pulley unit 130 transfers the rotational force transmitted from the drive motor 110 to the clutch unit 120 through the pulley belt 132. [

Since the rotational force generated by the drive motor 110 is transmitted to the clutch unit 120 through the pulley unit 130, the rotational speed of the drive motor 110 and the rotational speed of the clutch unit 120 may be different from each other have.

For example, if the diameter of the drive pulley 131 connected to the drive motor 110 is smaller than the diameter of the driven pulley 133 connected to the clutch unit 120, the rotational force of the drive motor 110 is transmitted to the pulley unit 130, And is transmitted to the clutch unit 120. [

The clutch unit 120 selectively transmits the rotational force transmitted from the pulley unit 130 to the rotary tub 30 and the pulsator 40 as described above. Specifically, during the washing or rinsing cycle, the clutch unit 120 decelerates the rotational force transmitted from the pulley unit 130 and transmits the rotational force to the pulsator 40. In the dehydrating cycle, the clutch unit 120 rotates the pulley unit 130 to the rotary tub 30 and pulsator 40 as it is.

7 shows a control configuration of a washing machine according to an embodiment.

7, the washing machine 1 includes an input unit 210 for receiving a user's control command together with the above-described driving motor 110, a water supply valve 53 and a drain motor 73, A speed detector 230 for detecting the rotational speed of the drive motor 110 or the clutch unit 120; a water level detector 250 for detecting the water level of the water contained in the water tank 20; A storage unit 240 for storing programs and data related to the operation of the washing machine 1, and a controller 200 for collectively controlling the operation of the washing machine 1. [

The input unit 210 includes a plurality of operation buttons for receiving a control command for the washing machine 1 from a user. And a dial for receiving a setting for a washing operation.

For example, the washing machine 1 receives a washing course from a user through a dial, and receives additional washing settings such as a washing temperature, a rinsing frequency, and a dehydration intensity through an operation button.

Such an operation button may be a micro switch, a membrane switch, or a touch pad.

The display unit 220 may include a display for displaying the operation information of the washing machine 1 corresponding to the user's control command to the user as a visual image.

For example, before the washing operation, the washing machine 1 displays additional washing settings such as the washing course selected by the user, the washing temperature input by the user, the number of times of rinsing and dehydration intensity, Can be displayed. During the washing operation, the washing machine 1 can display the ongoing administrative information (for example, whether it is a washing cycle, a rinsing cycle or a dehydration cycle) through the display, a remaining washing time remaining until the washing is completed.

Such a display panel (not shown) may employ a liquid crystal display (LCD) panel, a light emitting diode (LED) panel, or an organic light emitting diode (OLED).

In addition, the input unit 210 and the display unit 220 are not always provided with a separate configuration.

For example, the washing machine 1 may include a touch screen panel in which a touch panel for detecting a user's touch coordinates and a display panel for displaying a visual image are integrally provided.

The touch screen panel displays control commands that the user can select via the display panel. When the user selects one of the control commands displayed on the display panel and touches the touch panel, the touch screen panel detects the touch coordinates of the user through the touch panel, compares the detected touch coordinates with the coordinates of the control command, The control command can be recognized.

The speed detecting unit 230 detects the rotational speed of the driving motor 110 or the clutch unit 120. [

The speed detector 230 will be described in detail below.

The water level detection unit 250 detects the water level of the water contained in the water tank 20. [ Specifically, the water level detector 250 may include the water level sensing pipe 22b and the pressure sensor 22a described above, and may output an electrical signal corresponding to the water level of the water contained in the water tank 20. [

The storage unit 240 may include a control program for controlling the operation of the washing machine 1 and a non-volatile memory (not shown) such as a magnetic disc, a solid-state disk, etc. for permanently storing control data, A volatile memory (not shown) such as a D-RAM or an S-RAM for temporarily storing temporary data generated in the process of controlling the operation of the washing machine 1.

The control unit 200 controls the operation of the washing machine 1 according to the user's control command input through the input unit 210 and the program and data stored in the storage unit 240.

During the washing operation, the controller 200 may control the respective components included in the washing machine 1 to perform the water supply operation, the washing operation, and the intermediate dehydration operation.

Specifically, during the water supply operation, the control unit 200 opens the water supply valve 53 so that water is supplied to the water tank 20, and operates the drive motor 110 to rotate the pulsator 40 during the washing operation.

During the intermediate dewatering operation, the controller 200 operates the drain motor 73 to drain the water in the water tank 20 and drives the drive motor 110 to rotate the rotary tank 30 and pulsator 40 And operates. (When the drain motor 73 is operated as described above, the clutch unit 120 transmits the rotational force of the drive motor 110 to the rotary tank 30 and the pulsator 40.)

Then, during the rinsing cycle, the controller 200 can control the respective configurations included in the washing machine 1 to perform the rinse water supply operation, the rinse operation and the intermediate dehydration operation.

During the dewatering process, the controller 200 controls the washing machine (not shown) to perform the dewatering operation in which both the rotary tub 30 and the pulsator 40 are rotated by operating the driving motor 110 while the drain motor 73 is operated 1 can be controlled.

In addition, various operations of the washing machine 1 described below can be interpreted as a control operation of the control unit 200. [

FIG. 8 illustrates the structure of a speed detector included in the washing machine according to an embodiment of the present invention, and FIGS. 9 to 13 illustrate an example of the arrangement of a speed detector included in the washing machine according to an embodiment of the present invention.

8 to 13, the speed detecting unit 230 includes a position indicating member 231 indicating the rotation of the driving motor 110 or the clutch unit 120, a speed detecting sensor 231 detecting the position indicating member 231, 233).

The position indicating member 231 can be positioned to rotate with the motor rotating shaft 115 or the clutch rotating shaft 125 and the speed detecting sensor 233 can be fixed to the motor casing 111 or the clutch housing 121 Lt; / RTI > configuration.

9, the position indicating member 231 is provided on the driven pulley 133 coupled to the clutch rotating shaft 125, and the speed detecting sensor 233 is provided on the lower portion of the clutch housing 121 .

In this case, the position indicating member 231 rotates with the clutch rotating shaft 125 as the center of rotation together with the driven pulley 133. While the position indicating member 231 rotates, the speed detecting sensor 233 periodically moves to the position The display member 231 can be detected.

The speed detection unit 230 detects the position detection member 231 at a period during which the speed detection sensor 233 detects the position indicating member 231 or a number of times the speed detection sensor 233 detects the position indicating member 231 during a predetermined reference time The rotational speed of the clutch rotating shaft 125 can be calculated.

The washing machine 1 can calculate the rotational speed of the rotary tub 30 or pulsator 40 based on the rotational speed of the clutch rotational shaft 125 detected by the speed detecting unit 230. [

If the position indicating member 231 is provided along the circumferential direction of the driven pulley 133 in accordance with the embodiment of the present invention, the speed detecting unit 230 may detect the rotational speed of the clutch rotating shaft 125 Can also be determined.

The speed detection unit 230 may be provided with a support member 235 for supporting the speed detection sensor 233 so that the speed detection sensor 233 is located further adjacent to the position indicating member 231, As shown in FIG.

The support member 235 may extend from the lower portion of the clutch housing 121 toward the driven pulley 133 so that the speed detecting sensor 233 is positioned adjacent to the position indicating member 231. [

11, the position indicating member 231 is provided on the outer surface of the reduction gear 123 included in the clutch unit 120, and the speed detecting sensor 233 is provided on the outer surface of the clutch housing 120 Can be provided on one side.

In this case, the position indicating member 231 rotates together with the reduction gear 123, and the speed detecting sensor 233 periodically detects the position indicating member 231 while the upper indicating member 231 is rotating have.

The speed detection unit 230 detects the position detection member 231 at a period during which the speed detection sensor 233 detects the position indicating member 231 or a number of times the speed detection sensor 233 detects the position indicating member 231 during a predetermined reference time The rotational speed of the clutch rotating shaft 125 can be calculated.

The washing machine 1 can calculate the rotational speed of the rotary tub 30 or pulsator 40 based on the rotational speed of the clutch rotational shaft 125 detected by the speed detecting unit 230. [

If the position indicating member 231 is provided along the circumferential direction of the outer surface of the reduction gear 123 in accordance with the embodiment of the present invention, the speed detecting unit 230 may detect not only the rotational speed of the clutch rotating shaft 125, 125 can also be determined.

12, the position indicating member 231 is provided on the driving pulley 131 coupled to the motor rotating shaft 115, and the speed detecting sensor 233 is provided on the lower portion of the motor casing 111 .

In this case, the position indicating member 231 rotates together with the drive pulley 131 about the motor rotating shaft 115, and while the position indicating member 231 rotates, the speed detecting sensor 233 periodically displays the position The member 231 can be detected.

The speed detection unit 230 detects the position detection member 231 at a period during which the speed detection sensor 233 detects the position indicating member 231 or a number of times the speed detection sensor 233 detects the position indicating member 231 during a predetermined reference time The rotation speed of the position motor rotary shaft 115 can be calculated.

The washing machine 1 can calculate the rotational speed of the rotary tub 30 or pulsator 40 based on the rotational speed of the motor rotating shaft 115 detected by the speed detecting unit 230. [

If the position indicating member 231 is provided along the circumferential direction of the driving pulley 131 according to the embodiment of the present invention, the speed detecting unit 230 may detect the rotational speed of the motor rotating shaft 115 Can also be determined.

The speed detecting unit 230 may be configured to support the speed detecting sensor 233 such that the speed detecting sensor 233 is located further adjacent to the position indicating member 231 as shown in FIG. And a support member 235 for supporting the support member. The support member 235 may be extended from the lower portion of the motor casing 121 toward the drive pulley 133 such that the speed detection sensor 233 is positioned adjacent to the position indicating member 231. [

Thus, the speed detecting sensor 233 and the position indicating member 231 can be positioned at various positions.

In order to detect the rotational speed of the drive motor 110 or the clutch unit 120, the speed detecting unit 230 may employ various configurations for detecting the rotational displacement or rotational speed of the rotational body.

For example, the velocity detection unit 230 may include a hall sensor and a permanent magnet.

Specifically, the washing machine 1 employs a hall sensor for detecting a magnetic field as the speed detecting sensor 233, and may adopt a permanent magnet for generating a magnetic field with the position indicating member 231. [

Specifically, a permanent magnet may be disposed on the drive pulley 131 or the driven pulley 133 to rotate the permanent magnet together with the motor rotation shaft 115 or the clutch rotation shaft 125, And can be disposed in the clutch housing 121 to detect the permanent magnet.

While the drive pulley 131 or the driven pulley 133 in which the permanent magnets are disposed rotates, the Hall sensor periodically detects the magnetic field generated by the permanent magnets. The speed detector 230 calculates the rotation speed of the motor rotation shaft 115 or the clutch rotation shaft 125 based on the number of times that the Hall sensor detects the magnetic field or the Hall sensor detects the magnetic field for a predetermined reference time .

As another example, the speed detection unit 230 may include an infrared sensor module.

Specifically, the washing machine 10 employs an infrared ray sensor that emits infrared rays as the speed detection sensor 233 and an infrared ray sensor that receives infrared rays, and employs a slit through which the infrared ray can pass as the position indicating member 231 .

More specifically, it is possible to form a slit through which the infrared ray can pass through the driving pulley 131 or the driven pulley 133, and to arrange the infrared LED and the infrared ray sensor with the driving pulley 131 or the driven pulley 133 therebetween have.

The infrared sensor periodically detects the infrared ray emitted from the infrared LED while the driving pulley 131 or the driven pulley 133 with the slit is rotated. In addition, the speed detector 230 may calculate the rotation speed of the motor rotation shaft 115 or the clutch rotation shaft 125 based on the number of times the infrared sensor detects the infrared ray during the period of detecting the infrared ray by the infrared sensor or during the predetermined reference time .

In addition, the speed detector 230 may include an encoder or a resolver in addition to the drive motor 110, the clutch unit 120, and the pulley unit 130.

For example, the motor rotation shaft 115 of the drive motor 110 may be further extended to the lower portion of the drive pulley 131, and an encoder or resolver may be provided at the end of the motor rotation shaft 115.

As another example, the clutch rotation axis 125 of the clutch unit 120 may be further extended to the lower portion of the driven pulley 133, and an encoder or resolver may be provided at the end of the clutch rotation axis 125. [

The structure of the washing machine 1 according to the embodiment has been described above.

Hereinafter, the operation of the washing machine 1 according to the embodiment will be described.

14 shows the operation of the washing machine according to an embodiment.

The user can select a washing course through the input unit 210 and input detailed setting values such as the washing temperature, the number of times of rinsing, and the dehydration intensity according to each washing course. Thereafter, when the user inputs an operation start command through the input unit 210, the washing machine 1 performs a series of operations 1000 described below.

As shown in FIG. 14, the washing machine 1 determines whether an operation start command is input from a user (1010). For example, the washing machine 1 may receive an operation start command from a user through an operation start button included in the input unit 210. [

The operation start command is not input (NO in 1010), and the washing machine 1 waits until an operation start command is input. In addition, the washing machine 1 can receive a washing course or washing set value from the user before the operation start command is input.

When an operation start command is input (YES at 1010), the washing machine 1 detects the amount of laundry (1020).

For example, the washing machine 1 operates the driving motor 110 for a predetermined period of time and controls the rotation of the rotary tub 30 based on the driving current and the change in the rotational speed of the driving motor 110 or the clutch unit 120 It is possible to detect the amount of laundries housed. In other words, the washing machine 1 can calculate the amount of laundry by using a phenomenon that the rotational acceleration of the driving motor 110 or the clutch unit 120 is small as the amount of laundry stored in the rotary tub 30 increases.

As another example, the washing machine 1 may be provided with a weight sensor for sensing the weight of the damper 21 supporting the water tank 20 and directly detecting the amount of laundry contained in the rotary tub 30 based on the output of the weight sensor You may.

When the weight of the laundry is calculated, the washing machine 1 can determine the amount of water supplied to the water tank 20 according to the detected amount of the laundry.

Thereafter, the washing machine 1 can sequentially perform the washing cycle 1030, the rinsing cycle 1040, and the dewatering cycle 1050.

In addition, the washing machine 1 may perform only a part of the washing cycle 1030, the rinsing cycle 1040, and the dewatering cycle 1050 according to the user's selection. For example, the user can operate the washing machine 1 so as to perform only the washing process for washing the clothes, and operate the washing machine 1 so as to perform only the washing process after the hand washing.

The washing cycle 1030, the rinsing cycle 1040 and the dewatering cycle 1050 will be described in detail below.

During the washing cycle, the washing machine (1) separates the foreign matter adhered to the laundry by using the mechanical action between the water and the laundry and the chemical action of the detergent.

For the mechanical action between the water and the laundry, the washing machine 1 supplies water to the water tank 30 and rotates the pulsator 40 clockwise or counterclockwise to generate water flow. Further, for the chemical action of the detergent, the washing machine 1 supplies the detergent to the rotating tub 30 by allowing the water to flow through the detergent supply unit 60.

Specifically, during the washing cycle, the washing machine 1 can perform a water supply operation, a washing operation, a drain operation, and an intermediate dehydration operation.

The water supply operation is an operation in which the washing machine 1 supplies water to the water tank 20 and the washing machine 1 opens the water supply valve 53 of the water supply part 50 for a predetermined water supply time according to the detected amount of laundry .

After the water supply operation is completed, the washing machine 1 performs the washing operation 1100. [ The washing operation 1100 is an operation for rotating the pulsator 40 so that the laundry is washed.

FIG. 15 illustrates a washing operation of the washing machine according to an embodiment of the present invention, and FIG. 16 illustrates a driving signal and a rotating speed of the washing machine according to an embodiment of the present invention.

Referring to FIG. 15, the washing machine 1 rotates the pulsator 40 (1110).

Specifically, the washing machine 1 operates the clutch unit 120 so that the rotational force of the driving motor 110 is transmitted only to the pulsator 40. [ For example, if the washing machine 1 does not operate the drain motor 73 (see Fig. 6), the washing machine 1 transmits the rotational force of the driving motor 110 to the pulsator 40 only It is possible to prevent the rotational force from being transmitted to the rotary tub 30. [

When the clutch unit 120 is operated so that the rotational force of the driving motor 110 is transmitted only to the pulsator 40, the clutch unit 120 reduces the rotational force transmitted from the driving motor 110, 40).

Further, the washing machine 1 operates the driving motor 110 as shown in Fig. 16 (a). In other words, the washing machine 1 turns on a drive switch S1 (see Fig. 6) for supplying power to the drive motor 110. [

As a result, the rotational speed of pulsator 40 gradually increases as shown in Fig. 16 (b). At this time, the rate of increase of the rotating speed of pulsator 40 may vary depending on the amount of laundry and water contained in rotating tub 30.

Then, the washing machine 1 detects the rotational speed (1120), and determines whether the detected rotational speed is equal to or greater than a predetermined reference wash rate (1130).

Specifically, the washing machine 1 detects the rotational speed of the driving motor 110 or the clutch unit 120 using the above-described speed detecting unit 230, and detects the detected driving speed of the driving motor 110 or the clutch unit 120 The rotational speed of the pulsator 40 can be calculated based on the rotational speed as a basis.

The rotational speed of the driving motor 110 and the rotational speed of the clutch unit 120 may be different from each other and the washing machine 1 may be driven by the driving motor 110 or the clutch unit 120 120 can be detected.

If the detected rotational speed is not more than the reference wash rate (NO at 1130), the washing machine 1 detects the rotational speed of the pulsator 40 and repeats the comparison of the detected rotational speed and the reference wash rate.

If the detected rotational speed is equal to or greater than the reference wash rate (YES in 1130), the washing machine 1 stops the rotational drive of the pulsator 40 (1140).

Specifically, the washing machine 1 stops operating the driving motor 110 as shown in FIG. 16 (a). In other words, the washing machine 1 turns off the driving switch S1 (see Fig. 6) for supplying power to the driving motor 110. [

As a result, the rotation speed of pulsator 40 gradually decreases as shown in Fig. 16 (b).

Thereafter, the washing machine 1 waits for a predetermined waiting period after the pulsator 40 stops rotating (1150).

Thereafter, the washing machine 1 determines whether the washing execution time is longer than a reference washing time (1160). Specifically, the washing machine 1 compares the reference wash time determined according to the laundry performing time and the amount of the laundry performed the washing operation 1100 shown in FIG.

If the laundry execution time is not longer than the reference wash time (NO in 1160), the washing machine 1 repeats the washing operation.

At this time, the washing machine 1 may change the rotational direction of the pulsator 40 as shown in FIG. 16 every time the washing operation 1100 is performed.

For example, in the first washing operation 1100, the washing machine 1 rotates the pulsator 40 clockwise, and in the second washing operation 1100, the washing machine 1 rotates the pulsator 40 counterclockwise . Further, in the third washing operation 1100, the washing machine 1 can rotate the pulsator 40 again in the clockwise direction.

Specifically, the washing machine 1 can control the driving motor 110 so that the driving motor 110 alternately rotates in the clockwise direction and the counterclockwise direction during the washing cycle, and as a result, 40 may alternately repeat clockwise rotation and counterclockwise rotation during the washing stroke.

If the laundry execution time is longer than the reference wash time (YES in 1160), the washing machine 1 ends the washing operation.

As described above, the washing machine 1 repeats the washing operation for a predetermined reference washing time according to the amount of laundry.

The washing operation 1100 shown in FIG. 15 controls the driving motor 110 based on the rotational speed of the pulsator 40, but is not limited thereto.

For example, the washing machine 1 may repeat the operation of driving the driving motor 110 for a predetermined ON time and stopping the driving motor 110 for a predetermined OFF time.

In another example, the washing machine 1 stops driving the driving motor 110 after driving the driving motor 110 until the rotational speed of the pulsator 40 reaches a predetermined reference washing speed, The driving motor 110 may be restarted when the rotational speed of the driving motor 40 is "0 ".

The washing machine 1 may perform the washing operation 1100 shown in FIG. 15 during a predetermined washing time according to the amount of the laundry.

After the washing operation 1100 is finished, the washing machine 1 performs a drain operation.

The drainage operation is an operation in which the washing machine 1 discharges the water contained in the water tank 20 to the outside. Specifically, the washing machine 1 can open the drain valve 72 by operating the drain motor 73. [

After the drainage operation, the washing machine 1 can perform the intermediate dewatering operation.

The intermediate dewatering operation is an operation of rotating the rotary tub 30 and pulsator 40 at a high speed and separating water from laundry by using centrifugal force due to high-speed rotation.

The intermediate dewatering operation is the same as the operation of the washing machine 1 in the dewatering stroke to be described later and will be described in detail below.

When the washing cycle is completed, the washing machine 1 performs a rinsing cycle, and during the rinsing cycle, the washing machine 1 removes foreign matter and detergent from the laundry.

Specifically, during the rinsing cycle, the washing machine 1 can perform a water supply operation, a rinsing operation, a drain operation, and an intermediate dehydration operation.

During the rinsing cycle, the washing machine 1 supplies water to the water tank 20 to perform a water supply operation, rotates the pulsator 40 clockwise or counterclockwise to perform a rinsing operation, The rotary tub 30 and the pulsator 40 are rotated at high speed to perform the intermediate dewatering operation.

The water supply operation, the rinse operation, the drain operation and the intermediate dehydration operation of the rinsing cycle are the same as the water supply operation, the washing operation, the drain operation and the intermediate dehydration operation of the washing cycle, A detailed description thereof will be omitted.

When the rinsing cycle is completed, the washing machine 1 performs a dewatering cycle.

During the dewatering cycle, the washing machine 1 rotates the rotary tub 30 and pulsator 40 at a high speed and separates water from the laundry by using centrifugal force due to high-speed rotation.

Specifically, during the dewatering cycle, the washing machine 1 performs an intermittent dewatering operation for gradually increasing the rotational speed of the rotary tub 30 and the pulsator 40, an intermittent dewatering operation for rotating the rotating tub 30 and the pulsator 40 at a high speed of 700 rpm or more Thereby performing a dewatering operation.

During the intermittent dewatering operation, the washing machine 1 repeats the operation and stop of the driving motor 110, and during the main dewatering operation, the washing machine 1 activates the driving motor 110 for a predetermined time.

The washing machine 1 can reduce the load on the driving motor 110 in the main dewatering operation by performing the intermittent dewatering operation. A large amount of water is separated from the laundry during the intermittent dewatering operation, and the weight of the laundry during the dewatering operation is significantly lower than the weight of the laundry during the intermittent dewatering operation.

Further, the washing machine 1 performs an intermittent dewatering operation so that water separated from laundry can be drained.

There is a possibility that the water in the water tray 20 may not smoothly flow while the rotary tub 30 rotates at a high speed. This is because water is continuously supplied between the rotary tub 30 and the water tub 20 by the centrifugal force due to the rotation of the rotary tub 30 and water between the rotary tub 30 and the water tub 20 is supplied to the rotary tub 30, As shown in FIG.

The washing machine 1 drains a large amount of water separated from laundry by rotating the rotary tub 30 at a low speed before rotating the tub 30 at a high speed and then rotates the tub 30 at a high speed, .

At least one resonance region exists in the rotational speed range of the rotary tub 30 during the intermittent dewatering operation.

The resonance is a phenomenon in which the vibration of the water bath 20 becomes very large due to the rotation of the rotary bath 30 when the vibration frequency of the water bath 20 accommodating the rotary bath 30 coincides with the rotation speed of the rotary bath 30 to be.

When the resonance phenomenon occurs, the noise caused by vibration and vibration of the washing machine 1 becomes very large, and if the washing machine 1 is severely damaged, the washing machine 1 may be damaged.

The resonance due to the rotation of the rotary tub 30 can be largely divided into two types. There is a second resonance in which the first resonance occurring at a rotational speed of the rotating tub 30 of approximately 100 rpm and the rotational speed of the rotating tub 30 at approximately 300 rpm occur depending on the size of the rotating tub 30 do.

The first resonance is a phenomenon in which the whole of the water tub 20 accommodating the rotary tub 30 is vigorously vibrated to the left and right while the tub 30 is rotated and the second resonance is repeatedly performed while rotating the tub 30 30 and the upper and lower portions of the water tank 20 are vibrated in directions opposite to each other.

The rotational speed of the rotary tub 30 in which the first resonance and the second resonance are generated may vary depending on the size, shape, and weight of the rotary tub 30, Can vary.

Further, the first resonance and the second resonance do not occur at a specific rotational speed but can occur at a continuous rotational speed range.

Hereinafter, the rotational speed region in which the first resonance occurs is referred to as a first resonance region R1, and the rotational speed region in which the second resonance occurs is referred to as a second resonance region R2.

Such a vibration due to the resonance phenomenon can be minimized by reducing the number of times the rotational speed of the rotary tub 30 passes through the resonance region or by increasing the weight of the water tub 20 accommodating the rotary tub 30. [

First, a method of minimizing the vibration due to the resonance phenomenon by reducing the rotational speed of the rotating tub 30 from passing through the resonance region will be described.

Fig. 17 shows a driving signal and a rotational speed by an intermittent dewatering operation according to the prior art.

In order to perform the intermittent dewatering operation, the conventional washing machine operates the driving motor for a predetermined ON time and then stops the driving motor for a predetermined OFF time.

For example, as shown in FIG. 17, the conventional washing machine operates the driving motor during the first ON time, stops the driving motor during the first OFF time, and stops the driving motor during the second ON time And stops the operation of the drive motor during the second off-time.

As shown in FIG. 17 (b), the rotation speed of the rotating tub 30 is increased by the intermittent dewatering operation when the driving motor is operated and the rotation speed is decreased when the driving motor is stopped .

At this time, by appropriately setting the on-time and the off-time of the drive motor, the rotational speed of the rotating tub is changed from the first resonance region R1 to the second resonance region R1 as shown in the first speed graph (V1) Let the region R2 pass once.

However, when the amount of laundry is increased or the power supply for supplying electric energy to the driving motor is unstable, the rotational speed of the rotating tub is changed from the first resonance region (V2) to the second resonance region R1 and the second resonance region R2, respectively. As a result, the oscillation of the rotating bath during the intermittent dewatering operation can become very large.

Thus, the conventional washing machine has difficulty in avoiding the resonance region by controlling the operation of the driving motor based on the operating time in the intermittent dewatering operation.

On the contrary, the washing machine 1 according to the embodiment can easily avoid the resonance area by controlling the operation of the driving motor 110 based on the rotation speed.

FIG. 18 shows the intermittent dewatering operation of the washing machine according to the embodiment, and FIG. 19 shows the driving signal and the rotational speed by the intermittent dewatering operation of the washing machine according to the embodiment.

18 and 19, the intermittent dewatering operation 1200 of the washing machine 1 according to the embodiment will be described.

During intermittent dewatering, the washing machine 1 rotationally drives the rotary tub 30 and pulsator 40 (1210).

The washing machine 1 operates the clutch unit 120 so that the rotational force of the driving motor 110 is transmitted to both the rotatable tub 30 and the pulsator 40. [ For example, when the washing machine 1 operates the drain motor 73 (see Fig. 6), the washing machine 1 causes the clutch unit 120 to rotate the rotating force of the driving motor 110 to the rotating tub 30 and the pulsator 40).

When the clutch unit 120 is operated so that the rotational force of the driving motor 110 is transmitted to both the rotary tub 30 and the pulsator 40, And transmits the rotational force to both the rotary tub 30 and the pulsator 40 as it is.

Further, the washing machine 1 operates the driving motor 110 as shown in Fig. 19 (a). In other words, the washing machine 1 turns on a drive switch S1 (see Fig. 6) for supplying power to the drive motor 110. [

As a result, the rotational speed of the rotary tub 30 and pulsator 40 increases gradually as shown in Fig. 19 (b). At this time, the increase in the rotational speed of the rotary tub 30 and the pulsator 40 may vary depending on the amount of laundry and water contained in the tub 30.

Further, in the dewatering process, the washing machine 1 can control the driving motor 110 so that the driving motor 110 rotates in either the clockwise direction or the counterclockwise direction, unlike the washing process. As a result, the rotary tub 30 and pulsator 40 rotate in either the clockwise or counterclockwise direction during the dewatering stroke.

Thereafter, the washing machine 1 detects the rotation speed of the rotary tub 30 and pulsator 40 (1220), and determines whether the detected rotation speed is equal to or higher than the upper limit speed (1230).

Specifically, the washing machine 1 detects the rotational speed of the driving motor 110 or the clutch unit 120 through the speed detecting unit 230, and rotates (rotates) based on the detected driving motor 110 or the clutch unit 120 It is possible to calculate the rotation speed of the rotary tub 30 and pulsator 40 based on the speed.

If the detected rotation speed is not higher than the upper limit speed (NO in 1230), the washing machine 1 detects the rotation speed of the rotary tub 30 and pulsator 40 and compares the detected rotation speed and the upper limit speed Repeat.

If the detected rotational speed is equal to or greater than the upper limit speed (YES in 1230), the washing machine 1 stops rotating operation of the rotary tub 30 and pulsator 40 (1240).

Specifically, the washing machine 1 stops operating the driving motor 110 as shown in Fig. 19 (a). In other words, the washing machine 1 turns off the driving switch S1 (see Fig. 6) for supplying power to the driving motor 110. [

As a result, the rotational speed of the rotary tub 30 and pulsator 40 gradually decreases as shown in FIG. 19 (b).

Thereafter, the washing machine 1 detects the rotational speed of the rotary tub 30 and the pulsator 40 (1250), and determines whether the detected rotational speed is lower than the lower limit speed (1260).

More specifically, the washing machine 1 detects the rotational speed of the driving motor 110 or the clutch unit 120 using the speed detecting unit 230 and detects the rotational speed of the driving motor 110 or the clutch unit 120 based on the detected driving motor 110 or clutch unit 120 The rotation speed of the rotary tub 30 and pulsator 40 can be calculated based on the rotation speed.

If the detected rotation speed is not lower than the lower limit speed (NO in 1260), the washing machine 1 detects the rotation speed of the rotary tub 30 and pulsator 40 and compares the detected rotation speed and the lower limit speed Repeat.

If the detected rotational speed is equal to or higher than the upper limit speed (YES in 1260), the washing machine 1 determines whether the number of times of intermittent dewatering is equal to or more than the reference intermittent dewatering frequency (1270).

Specifically, the washing machine 1 compares the number of times of intermittent dewatering performed and the number of times of intermittent dewatering determined according to the amount of laundry, and determines whether the number of times of intermittent dewatering is equal to or greater than the reference intermittent dewatering frequency.

If the number of intermittent dewatering operations is not equal to or more than the reference intermittent dewatering times (NO in 1270), the washing machine 1 repeats the intermittent dewatering operation.

At this time, the upper limit speed and the lower limit speed can be updated with new upper limit speed and lower limit speed.

For example, when performing the first intermittent dewatering operation as shown in FIG. 19 (a), the washing machine 1 'sets the upper limit speed to the first upper limit speed Va1 and the lower limit speed to the first The lower limit speed Vr1 can be set. Specifically, the washing machine 1 operates the driving motor 110 when the rotation speed of the rotary tub 30 and the pulsator 40 becomes the first upper limit speed Va1 or more after the driving motor 110 is operated The drive motor 110 can be restarted when the rotational speed of the rotary tub 30 and pulsator 40 is lower than the first lower limit speed Vr1.

At this time, the first upper limit speed Va1 and the first lower limit speed Vr1 can be determined as the rotation speed between the first resonance region R1 and the second resonance region R2.

When performing the second intermittent dewatering operation, the washing machine 1 can set the upper limit speed to the second upper limit speed Va2 and the lower limit speed to the second lower limit speed Vr2. The washing machine 1 stops the operation of the driving motor 110 when the rotational speed of the rotary tub 30 and the pulsator 40 becomes the second upper limit speed Va2 or more, And the rotational speed of the pulsator 40 becomes the second lower limit speed Vr2 or less, the drive motor 110 can be restarted.

At this time, the second upper limit speed Va2 and the second lower speed limit Vr2 may be larger than the first upper limit speed Va1 and the first lower limit speed Vr1, respectively. The second upper limit speed Va2 is larger than the first lower limit speed Vr2 and the second upper limit speed Va2 and the first lower speed limit Vr2 are larger than the first resonant range R1 and the second resonant range R2 ). ≪ / RTI >

When performing the third intermittent dewatering operation, the upper limit speed may be set to the third upper limit speed Va3, and the lower limit speed may be set to the third lower limit speed Vr3. The washing machine 1 stops the operation of the driving motor 110 when the rotating speed of the rotating tub 30 and the pulsator 40 becomes the third upper limit speed Va3 or more, And the rotational speed of pulsator 40 is equal to or lower than the third lower limit speed Vr3, the driving motor 110 can be restarted.

At this time, the third upper limit speed Va3 and the third lower speed limit Vr3 may be larger than the second upper limit speed Va2 and the second lower speed limit Vr2, respectively.

As such, when the intermittent dewatering operation is repeated, the upper limit speed and the lower limit speed gradually increase, and the rotation speed of the rotary tub 30 and pulsator 40 gradually increases.

If the number of intermittent dewatering operations is equal to or more than the reference intermittent dewatering times (example of 1270), the washing machine 1 ends the intermittent dewatering operation and starts the main dewatering operation.

Specifically, the washing machine 1 can continue to operate the driving motor 110 for a predetermined dewatering time without stopping the driving of the driving motor 110. As a result, the rotational speed of the rotating tub 30 and the pulsator 40 can be rotated at a rotational speed of approximately 720 rpm.

As described above, by repeating turning on / off of the driving motor 110 based on the rotational speeds of the rotary tub 30 and the pulsator 40, rotation (rotation) during the intermittent dewatering operation as shown in FIG. The rotating speed of the tub 30 and pulsator 40 passes through the first resonance region R1 and the second resonance region R2 once.

As a result, during the intermittent dewatering operation 1200, the washing machine 1 can minimize vibration and noise due to resonance, and even if the amount of laundry is changed, the washing machine 1 can minimize vibration and noise due to resonance.

FIG. 20 shows the rotational speed of the washing machine according to the amount of laundry in an embodiment. 20 shows a third speed graph V3 showing the rotation speed of the drive motor 110 or the clutch unit 120 when the amount of laundry is small and the driving speed of the driving motor 110 or And a fourth speed graph (V4) showing the rotational speed of the clutch unit (120).

Referring to FIG. 20, both the third speed graph V3 and the fourth speed graph V4 pass through the first resonance area R1 and the second resonance area R2 only once. This is because the washing machine 1 controls the operation of the driving motor 110 based on the rotational speed of the driving motor 110 or the clutch unit 120.

The washing machine 1 controls the driving motor 110 on the basis of the rotating speed of the rotating tub 30 and the pulsator 40 during the intermittent dewatering operation 1200 so that the washing tub 1 is rotated by the rotating tub 30, The vibration and noise can be minimized irrespective of the amount of laundry contained in the washing machine.

After the intermittent dewatering operation 1200, the washing machine 1 performs the main dewatering operation.

Specifically, the washing machine 1 continuously rotates the driving motor 110 for a predetermined dewatering operation time, thereby causing the rotary tub 30 to rotate at a main dewatering speed of 700 rpm to 800 rpm.

When the intermittent dewatering operation and the main dewatering operation are completed, the washing machine 1 ends its operation and warns the user that all operations have been completed.

The construction and operation of the washing machine 1 according to the embodiment have been described above.

Hereinafter, the construction and operation of the washing machine 1 'according to another embodiment will be described.

FIG. 21 shows a side cross-section of a washing machine according to another embodiment, and FIG. 22 shows a bottom portion of a washing machine according to another embodiment. Fig. 23 shows a ball balancer included in the washing machine according to another embodiment, and Fig. 24 shows a sectional view taken along the line I-I 'shown in Fig.

21 to 24, a washing machine 1 'includes a cabinet 10 for forming an outer appearance, a water tank 20 for containing water, a rotary tub 30 rotatably disposed in the water tank 20, A pulsator 40 for generating a water flow in the rotary tub 30, a water supply unit 50 for supplying water to the water tub 20, a detergent supply unit 60 for supplying detergent to the rotary tub 30, A ball balancer 90 for inducing a stable rotation of the rotary tub 30 and a rotary shaft 90 for selectively rotating the rotary tub 30 and the pulsator 40. [ And a driving unit 100.

The cabinet 10, the water tank 20, the rotary tub 30, the pulsator 40, the water supply unit 50, the detergent supply unit 60, and the drainage unit 70 are installed in the washing machine 1 ), And the description thereof will be omitted.

The ball balancer 90 is provided at the upper end of the rotary tub 30 to compensate the eccentricity of the weight so that the rotary tub 30 rotates smoothly.

The ball balancer 90 includes a balancer housing 91 formed in an annular shape and provided with an annular race 90a therein, a plurality of balls 92 movably installed in the balancer housing 91, And a viscous oil 93 formed to have a predetermined viscosity and filled in the race 90a at a predetermined height. The plurality of balls 92 can move in the circumferential direction of the rotary tub 12 along the races 90a.

The balancer housing 91 includes a first balancer housing 91a and a second balancer housing 91b which are formed in an annular shape and are coupled to each other to form an annular race 90a therebetween. The first balancer housing 91a is formed to have a U-shaped cross section to form an upper surface, an inner circumferential surface and an outer circumferential surface of the race 90a, and the second balancer housing 91b is formed on the upper side of the opened first balancer housing 91a Thereby forming the upper surface of the race 90a.

The race 90a is formed in a toric shape as described above and has a width and height greater than the diameter of the ball 92 so that the circumferential movement of the ball 92 in accordance with the rotation of the rotatable tub 12 Guide. The race 90a is formed to have a width sufficiently larger than the diameter of the ball 92 so that the ball 92 moves radially in accordance with the centrifugal force acting on the ball 92 when the rotary tub 30 is rotated .

The lower surface of the race 90a may extend radially outwardly and be inclined upwardly and the outer circumferential surface of the race 90a may be formed larger than the diameter of the ball 92. [ This is for the purpose of enabling the ball 92 to move radially outward along the lower surface of the race 90a made of an inclined surface only when the centrifugal force acting on the ball 92 is a certain level or more.

The ball 92 is made of a metal material having a spherical shape and is provided with a race 90a so as to cancel an imbalanced load generated in the rotary tub 12 by unbalance of the laundry when the rotary tub 12 is rotated And can be arranged to be movable in the circumferential direction of the rotary tub 12. When the rotary tub 12 rotates, the ball 92 performs a balancing function of the rotary tub 12 while moving along the race 90a.

The viscous oil 93 is filled into the race 90a so as to have a relatively low-height oil surface relative to the diameter of the ball 92. [ The amount of the viscous fluid 93 filled in the race 90a is such that the ball 92 can be completely immersed in the viscous fluid 93 in a state in which the viscous fluid 93 and the ball 92 move radially by centrifugal force Can be set to be positive.

The width of the race 90a may be relatively larger than the depth of the race 90a and the width of the race 90a may be relatively larger than the average depth of the race 90a since the lower surface of the race 90a is formed to be inclined. . When the width and depth of the race 90a are formed in this manner, the width of the viscous oil 93 moved radially by the centrifugal force is increased to the height of the viscous oil 93 filled in the lower portion of the race 90a by its own weight . The upper portion of the ball 92 supported on the lower surface of the race 90a by its own weight projects to the upper surface of the viscous oil 93 while the ball moved radially by the centrifugal force is moved by the viscous oil 93 ).

When the centrifugal force acting on the balls 92 is small due to the rotation of the rotary tub 30 at a low speed, the ball 92 is rotated in the race 90a In the radial direction. In this state, since the upper portion of the ball 92 is exposed to the outside of the viscous oil 93, the viscous force acting on the ball 92 is relatively small, so that the ball 92 can move in the circumferential direction.

The rotary drive unit 100 is provided below the water tub 20 and selectively provides rotational force to the rotary tub 30 or pulsator 40. [ Specifically, in the washing and rinsing stages, the rotation driving unit 100 operates in a washing mode in which a forward or reverse rotational force is applied to the pulsator 40. In the dehydration process, the rotary tub 30 and the pulsator 40 are rotated in a reverse direction To provide a rotational force of the motor.

The rotation drive unit 100 'will be described in detail below.

Fig. 25 is an enlarged view of the area C shown in Fig. 21, and Fig. 26 is a bottom view of a water tank included in the washing machine according to another embodiment.

25 and 26, the rotation driving unit 100 'includes a driving motor 110 for generating a rotational force and a driving motor 110 for selectively generating a rotational force transmitted from the driving motor 110 to the rotational tub 30 and the pulsator 40 And a pulley unit 130 for transmitting the rotational force generated by the drive motor 110 to the clutch unit 120. The clutch unit 120 '

The driving motor 110 includes a motor casing 111 that forms an outer appearance of the driving motor 110, a stator 112 that generates a rotating magnetic field, and a rotor 113 that rotates by a rotating magnetic field, 110 generate a rotational force for rotating the rotary tub 30 and pulsator 40.

The driving motor 110 includes a motor casing 111 that forms an outer surface of the driving motor 110, a stator 112 that generates a rotating magnetic field, a rotor 113 that rotates by a rotating magnetic field, And a motor rotation shaft 115 coupled with the rotor 113 to rotate together with the rotor 113. The drive motor 110 generates a rotational force for rotating the rotary tub 30 and pulsator 40. [

The driving motor 110 generates an induction current in the rotor 113 by a rotating magnetic field generated by the stator 112 and generates an interaction between a magnetic field generated by the induction current and a rotating magnetic field generated by the stator 112 An induction motor (IM) in which the rotor 113 rotates can be employed.

However, the driving motor 110 included in the washing machine 1 according to the embodiment is not limited to the induction motor. For example, the drive motor 110 may employ a synchronous motor (SM) in which the rotor 113 includes a permanent magnet generating a magnetic field. However, it is assumed that the driving motor 110 included in the washing machine 100 according to an embodiment employs an induction motor.

The clutch unit 120 'includes a clutch housing 121, a switching gear 122, a reduction gear 123, a clutch lever 124, a brake belt 126, a clutch lever 127 and a mode switching motor 129 . The clutch unit 120 may operate in a washing mode for transmitting the rotational force of the driving motor 120 to the pulsator 40 and a dehydrating mode for transmitting the rotational force to the rotating tub 30 and the pulsator 40 .

The clutch housing 121 forms the outer surface of the clutch unit 120 'and accommodates the switching gear 122 and the reduction gear 123 therein.

The clutch rotation shaft 125 receives the rotational force of the driving motor 110 from a pulley unit 130 to be described later and transmits the transmitted rotational force to the switching gear 122.

The switching gear 122 is connected to the rotating shoe rotation shaft 35 or pulsator rotation shaft 35 connected to the rotary shoe 30 in accordance with the operation of the washing machine 1 ' 45).

More specifically, the switching gear 122 transmits the rotational force of the clutch rotational shaft 125 to the pulsator rotational shaft 45 or the rotational force of the clutch rotational shaft 125 to the pulsator rotational shaft 45 in accordance with the operation of the clutch lever 124, And the rotary tubular rotary shaft 35, respectively.

The clutch lever 124 controls the operation of the switching gear 122 and the mode switching motor 129 controls the operation of the clutch lever 124 via the link wire.

The clutch lever 124 may be located at the first position P1 or the second position P2 as shown in Fig. 26, depending on the operation of the mode switching motor 129. [ Specifically, when the mode switching motor 129 is activated, the clutch lever 124 is located at the second position P2, and when the mode switching motor 129 is not operated, the clutch lever 124 is moved to the first position P1 Located.

Further, the clutch lever 124 can control the operation of the switching gear 122 in accordance with the positions P1 and P2 thereof.

Specifically, when the clutch lever 124 is in the first position P1, the switching gear 122 transmits the rotational force of the clutch rotational shaft 125 to the pulsator rotational shaft 45. [ When the clutch lever 124 is in the second position P2, the switching gear 122 can transmit the rotating force of the clutch rotating shaft 125 to both the pulsator rotation shaft 45 and the rotating shaft rotation shaft 35.

As a result, when the mode switching motor 129 is activated, only the pulsator 40 rotates, and when the mode switching motor 129 is not operated, the pulsator 40 and the rotary tub 30 can rotate together.

The decelerating gear 123 decelerates the rotational force of the clutch rotational shaft 125 in the washing mode and provides the rotational speed of the clutch rotational shaft 125 to the pulsator rotational shaft 45 in the dehydrating mode, to provide.

Specifically, when the rotating shafts 35 are fixed, the reduction gear 123 decelerates the rotational force of the clutch rotating shaft 125 to provide the pulsating shafts 45 to the pulsator rotation shafts 45, The reduction gear 123 provides the rotational force of the clutch rotation shaft 125 to the pulsator rotation shaft 45 and the rotation shaft rotation shaft 35 as it is.

The brake belt 126 is used to fix the rotary shaft 35 so that the rotary shaft 35 can not rotate in accordance with the operation of the clutch lever 127, Release the rotary shaft (35).

As described above, the clutch lever 127 is connected to the mode switching motor 129 and can operate the brake belt 126 in accordance with the operation of the mode switching motor 129.

When the clutch lever 127 is in the first position P1, the brake belt 126 fixes the rotary hinge rotation axis 35 and when the clutch lever 127 is in the second position P2, the brake belt 127 ) Releases the rotary shaft (35). If the mode switching motor 129 is not operated as described above, the clutch lever 124 is located at the first position P1. When the mode switching motor 129 is operated, the clutch lever 124 is moved to the second position P2.

Accordingly, when the mode switching motor 129 is not operated, the brake belt 126 fixes the rotary shaft 35 and when the mode switching motor 129 is operated, the brake belt 126 rotates the rotary shaft 35 Let it go.

As a result, if the mode switching motor 129 is not operated, only the pulsator 40 can be rotated, and when the mode switching motor 129 is operated, the pulsator 40 and the rotary tub 30 can rotate together.

As described above, the operation mode of the clutch unit 120 'is switched depending on whether the mode switching motor 129 is operated or not. In other words, when the mode switching motor 129 is activated, the clutch unit 120 'operates in the dehydration mode, and when the mode switching motor 129 is not operated, the clutch unit 120' operates in the washing mode.

Further, the clutch unit 120 'operates independently of the drain operation. Specifically, regardless of the operation of the drain motor 73, the operation mode of the clutch unit 120 'is switched according to the operation of the mode switching motor 129 included in the clutch unit 120'.

The pulley unit 130 includes a drive pulley 131 coupled to the motor rotation shaft 115 of the drive motor 110, a driven pulley 133 coupled to the clutch rotation shaft 125 of the clutch unit 120, And a pulley belt 132 for transmitting the rotational force of the driven pulley 133 to the driven pulley 133.

The drive motor 110 generates a rotational force using an AC power supplied from an external power source and transmits the generated rotational force to the pulley unit 130. [ The pulley unit 130 transfers the rotational force transmitted from the drive motor 110 to the clutch unit 120 through the pulley belt 132. [

Fig. 27 shows a control configuration of a washing machine according to another embodiment.

Referring to FIG. 27, the washing machine 1 'includes an input unit 210 for receiving a control command of the user, a washing machine 1 for washing the washing machine 1' together with the driving motor 110, the water supply valve 53 and the drain motor 73, A speed detector 230 for detecting the rotational speed of the drive motor 110 or the clutch unit 120 ', a water level detector 250 for detecting the water level of the water contained in the water tank 20 , And a control unit 200 'for controlling the operation of the washing machine 1 as a whole.

The input unit 210 includes a plurality of operation buttons for receiving a control command for the washing machine 1 from a user. The display unit 220 may include a display for displaying the operation information of the washing machine 1 corresponding to the user's control command to the user as a visual image.

The input unit 210 and the display unit 220 are the same as those of the washing machine 1 (see FIG. 7) according to the embodiment described above, and therefore, detailed description thereof will be omitted.

The speed detecting unit 230 detects the rotational speed of the driving motor 110 or the clutch unit 120. [ The speed detector 230 is also the same as the washing machine 1 (see FIG. 7) according to the embodiment described above, and thus a detailed description thereof will be omitted.

The water level detection unit 250 detects the water level of the water contained in the water tank 20. [ The water level detector 250 is also the same as the washing machine 1 (see FIG. 7) according to the embodiment described above, and thus a detailed description thereof will be omitted.

The control unit 200 'includes a memory 203 for storing programs and data related to the operation of the washing machine 1, and a microprocessor 201 for performing an operation for controlling various included configurations of the washing machine 1' . ≪ / RTI >

The memory 203 stores a control program for controlling the operation of the washing machine 1 and a nonvolatile memory for storing control data and for retaining the stored information even when the power supply is shut off and for temporarily storing various data related to the operation of the washing machine 1 Volatile memory.

The microprocessor 201 processes data stored in the memory 203 in accordance with a control program stored in the memory 203. [ For example, the microprocessor 201 changes the set value for the washing operation according to the washing setting inputted through the input unit 210, and controls the driving motor 110, the water supply valve (not shown) 53, the drain motor 73, and the mode change motor 129. [0064]

The controller 200 'can control the operation of various components included in the washing machine 1'. For example, the controller 200 'controls the driving motor 110, the water supply valve 53, and the water supply valve included in the washing machine 1 to perform a water supply operation, a washing operation, a drain operation, and an intermediate dehydration operation during a washing cycle and a rinsing cycle, The drain motor 73 and the mode switching motor 129 included in the washing machine 1 to control the drain motor 73 and the mode switching motor 129 and to perform the dewatering operation during the dewatering stroke Can be controlled.

In addition, various operations of the washing machine 1 'described below can be interpreted as a control operation of the control unit 200'.

The construction of the washing machine 1 'according to another embodiment has been described above.

Hereinafter, the operation of the washing machine 1 'according to another embodiment will be described.

28 illustrates a method of washing laundry in a washing machine according to another embodiment.

Referring to Fig. 28, a laundry washing method 2000 for the washing machine 1 'to wash laundry will be described.

The washing machine 1 'judges whether to perform washing (2010).

Before operating the washing machine 1 ', the user may select a washing course through the input unit 210 and input detailed settings such as the washing temperature, the number of times of rinsing, and the dehydration intensity. After inputting the washing course and the detailed setting, the user inputs a washing start command through the input unit 210. [

When a washing start command is input from the user, the washing machine 1 'can perform washing.

If it is judged that washing is to be performed (YES in 2010), the washing machine 1 'detects the amount of laundry (2020).

For example, the washing machine 1 'drives the driving motor 110 for a predetermined time, and rotates the rotary tub 30' based on the driving current and the rotational speed of the driving motor 110 or the clutch unit 120 ' The amount of laundry contained in the laundry can be detected. In other words, the washing machine 1 can calculate the amount of laundry by using the smaller rotation acceleration of the driving motor 110 or the clutch unit 120 'as the amount of laundry contained in the rotary tub 30 is larger.

In another example, the washing machine 1 'is provided with a weight sensor for sensing the weight of the damper 21 supporting the water tank 20, and directly detects the amount of laundry contained in the rotary tub 30 based on the output of the weight sensor .

The washing machine 1 can determine the amount of water to be supplied to the water tub 20 during the washing or rinsing cycle depending on the detected amount of laundry.

Thereafter, the washing machine 1 'performs a washing cycle (2030).

The washing process is performed by supplying water to the water tank 20 and rotating the pulsator 40 to discharge water from the water supply and washing operation 2031 and the water tub 30 to rotate the rotary tub 30, And a middle dewatering operation (2033).

Since the washing cycle is the same as the washing cycle of the washing machine 1 according to the embodiment, detailed description thereof will be omitted.

Thereafter, the washing machine 1 'performs a rinsing cycle (2040).

The rinsing cycle is a process of supplying water to the water tank 20 and rotating the pulsator 40 to discharge water from the water tank 30 and water supply and rinsing operation 2041 for rinsing the laundry, A drainage for separating water and a middle dewatering operation 2043.

Since the rinsing cycle is the same as the rinsing cycle of the washing machine 1 according to the embodiment, detailed description is omitted.

Thereafter, the washing machine 1 'performs a dewatering process (2050).

The dewatering step includes an intermittent dewatering operation for gradually increasing the rotation speed of the rotating tub 30 and a main dewatering operation for rotating the rotating tub 30 at a high speed.

The intermediate dewatering operation of the rinsing cycle as well as the dewatering operation described above may include the intermittent dewatering operation and the main dewatering operation.

The intermittent dewatering operation and the main dewatering operation will be described in more detail below.

Although the laundry washing method 2000 has been described as including the washing, rinsing, and dewatering processes, the present invention is not limited thereto.

For example, the washing machine 1 'may perform only a part of the washing, rinsing and dewatering steps depending on the user's selection. Specifically, the user can operate the washing machine 1 to perform only the washing process in order to perform the laundry, and operate the washing machine 1 to perform only the dewatering process after the hand washing.

29 shows the vibration of the water tank during the dehydration and dehydration stages.

29, the dehydration stroke includes an intermittent dehydration operation and a main dehydration operation.

2 (a), during the intermittent dewatering operation, the washing machine 1 'repeats the operation and stoppage of the driving motor 110, and during the main dewatering operation, the washing machine 1, (110) is operated to increase the rotation speed of the rotary tub (30).

The washing machine 1 'can reduce the load of the driving motor 110 in the main dewatering operation by performing the intermittent dewatering operation. A large amount of water is separated from the laundry during the intermittent dewatering operation, so that the weight of the laundry during the dewatering operation can be reduced.

Further, the washing machine 1 can perform the intermittent dewatering operation so that water can be drained smoothly. There is a possibility that the water in the water tray 20 may not smoothly flow while the rotary tub 30 rotates at a high speed. This is because water is continuously supplied between the rotary tub 30 and the water tub 20 by the centrifugal force due to the rotation of the rotary tub 30 and water between the rotary tub 30 and the water tub 20 is supplied to the rotary tub 30, As shown in FIG.

At least one resonance region exists in the rotational speed range of the rotary tub 30 during the intermittent dewatering operation. The resonance is a phenomenon in which the vibration of the water bath 20 becomes very large due to the rotation of the rotary bath 30 when the vibration frequency of the water bath 20 accommodating the rotary bath 30 coincides with the rotation speed of the rotary bath 30 to be.

When the resonance phenomenon occurs, the amplitude of the vibration of the water tub 20 included in the washing machine 1 becomes the maximum as shown in Fig. 29 (b). As a result, the noise of the washing machine 1 'becomes very large, and the washing machine 1' may be damaged by the vibration.

Such a vibration due to the resonance phenomenon can be minimized by reducing the number of times the rotational speed of the rotary tub 30 passes through the resonance region or by increasing the weight of the water tub 20 accommodating the rotary tub 30. [

The number of times the rotational speed of the rotary tub 30 passes through the resonance region is reduced as described above.

Hereinafter, a method of minimizing the vibration due to the resonance phenomenon by increasing the weight of the water tank 20 will be described.

30 and 31 show an example of a dewatering cycle of the washing machine according to another embodiment, and Fig. 32 shows the level of the residual water remaining in the water tank during the dewatering process shown in Figs. 30 and 31. Fig. 33 to 35 show an example of the opening / closing of the drain valve according to the rotational speed of the rotary tub during the dehydration stroke of the washing machine according to another embodiment.

Referring to Figs. 30 to 34, the drainage and dewatering operation 2100 of the washing machine 1 'according to another embodiment will be described. The drainage and dewatering operation 2100 described below can be applied not only to the drainage and dewatering operations in the dewatering process, but also to the drainage and intermediate dewatering operations of the laundry, the drainage of the rinsing operation, and the intermediate dewatering operation.

First, the washing machine 1 'determines whether the washing operation or the rinsing operation is finished (2110).

As described above, the drainage and dewatering operations are performed when the washing operation in the washing cycle and the rinsing cycle in the rinsing cycle are completed. Therefore, the washing machine 1 'can judge whether or not the drainage and dewatering operations are started by judging whether the washing operation or the rinsing operation is finished.

If it is determined that the washing operation or the rinsing operation is completed (YES in step 2110), the washing machine 1 'starts the drain operation (2115).

The washing machine 1 'opens the drain valve 72 to discharge the water contained in the water tank 20 to the outside. Specifically, the controller 200 'of the washing machine 1' can operate the drain motor 73. When the drain motor 73 is activated, the drain valve 72 is opened by the link wire between the drain motor 73 and the drain valve 72, and the water in the water tank 20 is discharged to the outside.

During the draining operation, the washing machine 1 'determines whether the water level of the water tank 20 is lower than the reference water level (2120). If the water level in the water tank 20 is lower than the reference water level (YES in step 2120), the washing machine 1 'stops water drainage (step 2125).

The washing machine 1 'can detect the water level of the water tank 20 based on the detection result of the water level detector 250, and compare the detected water level and the reference water level.

Further, when the detected water level reaches the reference water level, the washing machine 1 'closes the drain valve 72. Specifically, the controller 200 'of the washing machine 1' stops the operation of the drain motor 73. Here, the reference water level can be set to a water level higher than the minimum water level of the water tank 20 and lower than the bottom surface of the rotatable tank 30.

When the water level of the water tank 20 reaches the reference water level, residual water W is left on the bottom surface of the water tank 20 as shown in Fig.

The amount of the residual water W remaining in the water tank 20 after the drainage operation may vary according to the size of the water tank 20 and the water tank 20 may receive the residual water W of about 10 [ . That is, at the start of the dewatering operation after the drainage operation, the weight of the water tank 20 increases by about 10 [kg] to 15 [kg].

By thus leaving the residual water W in the water tank 20, it is possible to reduce the vibration of the water tank 20 due to the rotation of the rotary bath 30 during the dehydration operation. Specifically, by increasing or decreasing the weight of the water tank 20, the amplitude of the vibration of the water tank 20 is reduced.

Particularly, when the rotating speed of the rotating tub 30 passes through the resonance region, by increasing the weight of the tub 20, the washing machine 1 'reduces the vibration of the tub 20 due to the resonance of the rotating tub 20 .

In addition, by setting the level of the residual water W remaining in the water tub 20 to be lower than the bottom surface of the rotary tub 30, the rotation of the rotary tub 30 due to the residual water W in the spin- It is possible to prevent interference.

Thereafter, the washing machine 1 'switches the operation mode of the clutch unit 120' from the laundry mode to the dehydration mode (2130).

The washing machine 1 'activates the mode switching motor 129 to switch the operation mode of the clutch unit 120' to the dehydration mode. When the mode change motor 129 is activated, the clutch lever 127 included in the clutch unit 120 'moves from the first position P1 to the second position P2, The rotational force of the rotary shaft 125 is transmitted to the pulsator rotation shaft 45 and the rotary shaft rotation shaft 35 and the brake belt 126 releases the rotary shaft rotation shaft 35.

As a result, the rotational force of the drive motor 110 can be transmitted to both the pulsator 40 and the rotary tub 30. [

Then, the washing machine 1 'drives the driving motor 110 (2135).

When the washing machine 1 'supplies power to the driving motor 110, the driving motor 110 is rotated by the supplied power. The rotational force of the drive motor 110 is transmitted to both the pulsator 40 and the rotary tub 30 through the pulley unit 130 and the clutch unit 120 '.

As a result, when the drive motor 110 is operated, both the pulsator 40 and the rotary tub 30 rotate.

Thereafter, the washing machine 1 'judges whether the rotational speed of the pulsator 40 and the rotating tub 30 reaches the residual water discharging speed (2140), and determines whether the rotational speed of the pulsator 40 and the rotating tub 30 When the residual water discharge speed is reached (2140), the washing machine (1 ') starts the residual water discharge operation (2145).

The washing machine 1 'can detect the rotating speed of the pulsator 40 and the rotating tub 30 through the speed detecting unit 230 and compare the detected rotating speed with the residual water discharging speed.

When the detected rotation speed reaches the residual water discharge speed, the washing machine 1 'opens the drain valve 72 to discharge the residual water contained in the water tank 20 to the outside. Specifically, the controller 200 'of the washing machine 1' operates the drain motor 73.

When the drain motor 73 is activated, the drain valve 72 is opened by the link wire between the drain motor 73 and the drain valve 72, and the residual water remaining in the water tank 20 is discharged to the outside.

Here, the residual water discharge speed can be set in various ways.

For example, the residual water discharge speed may be set to a value larger than the speed of the first resonance region RR. Specifically, the residual water discharge rate can be set to the first upper limit speed described below.

33, when the rotational speed of the rotary tub 30 reaches the first upper limit speed, the water discharge valve 73 is opened and the water tank 20 is opened as shown in FIG. The remaining amount of water can be discharged.

The vibration of the water bath 20 can be reduced while the rotational speed of the rotary bath 30 passes through the resonance region RR by increasing the weight of the water bath 20 as described above.

Particularly when the amount of laundry contained in the rotary tub 30 is smaller than the capacity of the water tub 20 and the rotary tub 30, before the rotational speed of the rotary tub 30 passes through the resonance region RR, The weight of the water tank 20 for vibration reduction may be insufficient when the water tank 72 is opened.

Therefore, in order to sufficiently maintain the weight of the water tub 20 when the amount of laundry contained in the tub 30 is smaller than the capacity of the tub 20 and the tub 30, the washing machine 1 ' The residual water can be discharged after the rotational speed of the rotor 30 passes through the resonance region RR.

As another example, the residual water discharge speed may be set to the speed of the first resonance region RR.

34, when the rotational speed of the rotatable tub 30 reaches the first resonant region RR when the water discharge speed is set to the speed of the first resonant region RR, And the remaining water of the water tank 20 can be discharged.

The vibration of the water bath 20 can be reduced while the rotational speed of the rotary bath 30 passes through the resonance region RR by increasing the weight of the water bath 20 as described above.

In other words, it is sufficient that residual water remains in the water tub 20 while the rotational speed of the rotating tub 30 passes through the resonance region RR. On the other hand, if the water level of the water tank 20 is increased by the water separated from the laundry while the drain valve 72 is closed and the water level of the water tank 20 is increased, the rotation of the rotating tank 30 may be interrupted .

Particularly, when a proper amount of laundry corresponding to the capacity of the water tub 20 and the rotary tub 30 is accommodated in the rotary tub 30, the rotation speed of the rotary tub 30 is lowered to the drain valve When the drain valve 72 is opened after the rotational speed of the rotary tub 30 passes through the resonance region RR, the water tub 20 May be higher than the bottom surface of the rotary tub 30.

The amount of laundry to be contained in the water tub 20 and the rotary tub 30 is sufficient to maintain the weight of the water tub 20 sufficiently and to prevent the water level of the water tub 20 from reaching the rotating tub 30 The washing machine 1 'can discharge the residual water while the rotational speed of the rotating tub 30 passes through the resonance region RR.

As another example, the residual water discharge speed may be set to a value smaller than the speed of the first resonance region RR.

35, before the rotational speed of the rotatable tub 30 reaches the first resonant region RR when the residual water discharge speed is set to be smaller than the speed of the first resonant region RR, The remaining water of the water tank 20 can be discharged.

In order to reduce the vibration of the water tank 20 while the rotational speed of the rotary tub 30 passes through the resonance region RR, It is enough if there is remaining in the residue. On the other hand, if the water level of the water tank 20 is increased by the water separated from the laundry while the drain valve 72 is closed and the water level of the water tank 20 is increased, the rotation of the rotating tank 30 may be interrupted .

The washing machine 1'detects the water remaining in the water tank 20 before the rotational speed of the rotating bath 30 reaches the speed of the resonance region RR so that water in the water bath 20 does not interfere with the rotation of the rotating bath 30. [ .

Since the water separated from the laundry flows into the water tank 20, the water level of the water tank 20 is drastically lowered so that the water level in the water tank 20 is lowered It does not support.

On the other hand, the time required for the rotational speed of the rotating tub 30 to reach the speed of the resonance region RR due to the rotational force of the driving motor 110 is very short.

Particularly when a large amount of laundry is contained in the rotary tub 30 compared with the capacity of the water tub 20 and the rotary tub 30, after the rotational speed of the rotary tub 30 passes through the resonance region RR, There is a possibility that the water level of the water tank 20 becomes higher than the bottom surface of the rotary tank 30 when the valve 72 is opened.

Therefore, in order to prevent the water level of the water tank 20 from becoming higher than the bottom surface of the rotary tub 30 when a large amount of laundry is accommodated in the rotary tub 30 as compared with the capacity of the water tub 20 and the rotary tub 30 The washing machine 1 'can discharge residual water before the rotational speed of the rotating tub 30 passes through the resonance region RR.

As described above, the washing machine 1 'can adjust the time for discharging the residual water remaining in the water tub 20 according to the amount of laundry contained in the rotary tub 30. [

Specifically, the washing machine 1 'discharges the residual water after the rotating speed of the rotating tub 30 passes through the resonance region RR when the amount of the laundry contained in the rotating tub 30 is small, When the amount of laundry contained in the rotary tub 30 is proper, the residual water is discharged while the rotational speed of the rotary tub 30 passes through the resonance region RR. When the amount of laundry contained in the rotary tub 30 is large, The residual water can be discharged before the speed passes through the resonance region RR.

Thereafter, the washing machine 1 'determines whether the rotational speed of the rotary tub 30 and the pulsator 40 is higher than the upper limit speed (2150).

Specifically, the washing machine 1 'detects the rotational speed of the driving motor 110 or the clutch unit 120' through the speed detecting unit 230, and detects the detected driving motor 110 or the clutch unit 120 The rotation speed of the rotary tub 30 and the pulsator 40 can be calculated based on the rotation speed.

The washing machine 1 'detects the rotational speed of the rotary tub 30 and the pulsator 40, if the rotational speed of the rotary tub 30 and the pulsator 40 is not higher than the upper limit speed (NO in 2150) And the comparison between the detected rotation speed and the upper limit speed is repeated.

If the rotation speed of the rotary tub 30 and pulsator 40 is higher than the upper limit speed (YES in step 2150), the washing machine 1 'stops rotating the rotary tub 30 and pulsator 40 ).

Specifically, the control unit 200 'of the washing machine 1' can stop the operation of the driving motor 110. [ As a result, the rotational speed of the rotary tub 30 and pulsator 40 gradually decreases.

Thereafter, the washing machine 1 'judges whether the rotation speed of the rotary tub 30 and the pulsator 40 is lower than the lower limit speed (2160).

Specifically, the washing machine 1 'detects the rotational speed of the driving motor 110 or the clutch unit 120' using the speed detecting unit 230, and detects the rotational speed of the driving motor 110 or the clutch unit 120 The rotating speed of the rotating tub 30 and pulsator 40 can be calculated based on the rotating speed as a basis.

The washing machine 1 'detects the rotational speed of the rotary tub 30 and the pulsator 40, if the rotational speed of the rotary tub 30 and the pulsator 40 is not lower than the lower limit speed (NO in 2160) And the comparison between the detected rotation speed and the lower limit speed is repeated.

If the rotational speed of the rotary tub 30 and pulsator 40 is equal to or higher than the upper limit speed (YES in step 2160), the washing machine 1 'rotates the rotary tub 30 and the pulsator 40 (step 2165).

More specifically, the controller 200 'of the washing machine 1' can operate the driving motor 110. As a result, the rotational speed of the rotary tub 30 and pulsator 40 increases gradually.

Thereafter, the washing machine 1 'determines whether the number of intermittent dewatering operations is equal to or greater than the reference number (2170).

Specifically, the control unit 200 'of the washing machine 1' compares the reference times determined according to the number of intermittent dewatering operations performed with the intermittent dewatering operation and the amount of laundry, and determines whether the number of intermittent dewatering operations is equal to or greater than the reference number .

If the number of intermittent dewatering operations is smaller than the reference number (NO in 2170), the washing machine 1 'updates the upper limit speed and the lower limit speed to the new upper limit speed and the lower limit speed (2175) Repeat the stop.

For example, when performing the first intermittent dewatering operation, the washing machine 1 'may set the upper limit speed to the first upper limit speed and the lower limit speed to the first lower limit speed. Here, the first upper limit speed and the first lower speed may be greater than the speed of the resonance region RR.

When performing the second intermittent dewatering operation, the washing machine 1 'can set the upper limit speed to the second upper limit speed and the lower limit speed to the second lower limit speed. Here, the second upper limit speed may be larger than the first upper limit speed, and the second lower limit speed may be larger than the first lower limit speed.

When performing the third intermittent dewatering operation, the washing machine 1 'can set the upper limit speed to the third upper limit speed and the lower limit speed to the third lower limit speed. Here, the third upper limit speed may be larger than the second upper limit speed, and the third lower limit speed may be larger than the second lower limit speed.

As such, when the intermittent dewatering operation is repeated, the upper limit speed and the lower limit speed gradually increase, and the rotation speed of the rotary tub 30 and pulsator 40 gradually increases.

If the number of times of intermittent dehydration is equal to or more than the reference number (YES in step 2170), the washing machine 1 'determines whether the time for dehydration is equal to or longer than a reference time (2180). In other words, if the number of intermittent dewatering operations is equal to or greater than the reference number of times, the washing machine 1 'terminates the intermittent dewatering operation and starts the main dewatering operation.

If the time taken for dehydration is less than the reference time (NO in 2180), the washing machine 1 'continues driving the driving motor 110.

During this dewatering operation, the washing machine 1 'can continue to drive the driving motor 110 for a predetermined dewatering time without stopping the driving of the driving motor 110. As a result, the rotational speed of the rotating tub 30 and the pulsator 40 can be rotated at a rotational speed of approximately 720 rpm.

If the dewatering time is longer than the reference time (YES in 2180), the washing machine 1 'stops driving the driving motor 110 (2185).

When the dewatering time is equal to or longer than the reference time, the washing machine 1 'stops all operations for washing the laundry and stops rotating the rotating tub 30.

As described above, in the washing machine 1 'including the drain motor 73 and the mode switching motor 129 separately, residual water is left in the water tank 20 before the intermittent dewatering operation is started, and when the drain valve 72 is closed The rotary tub 30 can be rotated. As a result, the vibration of the water tub 20 is reduced while the rotational speed of the rotating tub 30 passes through the resonance region RR.

Figs. 36 and 37 show another example of the dewatering process of the washing machine according to another embodiment, and Fig. 38 shows the water level of the water for untangling the laundry during the dewatering process shown in Figs. 36 and 37. Fig.

Referring to Figs. 36 to 38, the drainage and dewatering operation 2100 of the washing machine 1 'according to another embodiment will be described. The drainage and dewatering operation 2100 described below can be applied not only to the drainage and dewatering operations in the dewatering process, but also to the drainage and intermediate dewatering operations of the laundry, the drainage of the rinsing operation, and the intermediate dewatering operation.

First, the washing machine 1 'determines whether the washing operation or the rinsing operation is finished (2210).

As described above, the drainage and dewatering operations are performed when the washing operation in the washing cycle and the rinsing cycle in the rinsing cycle are completed. Therefore, the washing machine 1 'can judge whether or not the drainage and dewatering operations are started by judging whether the washing operation or the rinsing operation is finished.

If it is determined that the washing operation or the rinsing operation is completed (YES in step 2210), the washing machine 1 'starts the first drain operation (2215).

The washing machine 1 'opens the drain valve 72 to discharge the water contained in the water tank 20 to the outside. Specifically, the controller 200 'of the washing machine 1' can operate the drain motor 73. When the drain motor 73 is activated, the drain valve 72 is opened by the link wire between the drain motor 73 and the drain valve 72, and the water in the water tank 20 is discharged to the outside.

During the first drainage operation, the washing machine 1 'determines whether the water level of the water tank 20 is equal to or less than the first reference water level 2220. If the water level of the water tank 20 is equal to or less than the first reference water level 2220, The washing machine 1 'stops the first drainage (2225).

The washing machine 1 'can detect the water level of the water tank 20 based on the detection result of the water level detector 250 and compare the detected water level with the first reference water level.

Further, when the detected water level reaches the first reference water level, the washing machine 1 'closes the drain valve 72. Specifically, the controller 200 'of the washing machine 1' stops the operation of the drain motor 73.

Here, the first reference water level may vary depending on the amount of laundry, and the laundry may be set so as to be submerged in water.

When the water level of the water tank 20 reaches the first reference water level, as shown in FIG.

Thereafter, the washing machine 1 'switches the operation mode of the clutch unit 120' from the laundry mode to the dehydration mode (2230), and repeats the operation and stop of the drive motor 110 for the first reference time (2235 ). In other words, the washing machine 1 'performs a pulling-out operation to untangle laundry.

The washing machine 1 'activates the mode switching motor 129 to switch the operation mode of the clutch unit 120' to the dehydration mode. When the mode change motor 129 is activated, the clutch lever 127 included in the clutch unit 120 'moves from the first position P1 to the second position P2, The rotational force of the rotary shaft 125 is transmitted to the pulsator rotation shaft 45 and the rotary shaft rotation shaft 35 and the brake belt 126 releases the rotary shaft rotation shaft 35.

When the drive motor 110 repeats the operation and stoppage after the clutch unit 120 'is switched to the dehydration mode, the rotary tub 30 and the pulsator 40 repeat the rotation and stop, ) Also repeatedly rotate and stop.

While the laundry repeats rotation and stop in the rotary tub 30, the tangles of the laundry naturally loose. The laundry moves to the vicinity of the inner surface of the rotary tub 30 by rotation, and the unbalance of the weight inside the rotary tub 30 is eliminated. That is, the unbalance caused by the bunching of the laundry is eliminated.

Thereafter, the washing machine 1 'starts the second drain operation (2240). Specifically, the washing machine 1 'opens the drain valve 72 to discharge the water contained in the water tub 20 to the outside.

During the second drainage operation, the washing machine 1 'determines whether the water level of the water tank 20 is equal to or lower than the second reference water level 2245, and if the water level of the water tank 20 is lower than the second reference water level The washing machine 1 'stops the second drainage (2250).

The washing machine 1 'can detect the water level of the water tank 20 based on the detection result of the water level detection unit 250 and compare the detected water level with the second reference water level. Further, when the detected water level reaches the second reference water level, the washing machine 1 'closes the drain valve 72. Here, the second reference water level can be set to a water level higher than the minimum water level of the water tank 20 and lower than the bottom surface of the rotatable tub 30.

That is, the washing machine 1 'leaves residual water in the water tub 20 to reduce the vibration of the water bath 20, which occurs during the intermittent dewatering operation.

Then, the washing machine 1 'drives the driving motor 110 (2255). When the drive motor 110 is operated, both the pulsator 40 and the rotary tub 30 rotate.

Thereafter, the washing machine 1 'judges whether the rotational speed of the pulsator 40 and the rotating tub 30 reaches the residual water discharging speed (2260), and determines whether the rotational speed of the pulsator 40 and the rotating tub 30 When the residual water discharge speed is reached (2140), the washing machine 1 'starts the residual water discharge operation (2265).

The washing machine 1 'can detect the rotating speed of the pulsator 40 and the rotating tub 30 through the speed detecting unit 230 and compare the detected rotating speed with the residual water discharging speed. When the detected rotation speed reaches the residual water discharge speed, the washing machine 1 'opens the drain valve 72 to discharge the residual water contained in the water tank 20 to the outside. Specifically, the controller 200 'of the washing machine 1' operates the drain motor 73.

Here, the residual water discharge speed can be set variously according to the amount of laundry as described above.

Thereafter, the washing machine 1 'repeats the operation and stop of the driving motor 110 according to the rotating speed of the rotating tub 30 (2270). In other words, the washing machine 1 'performs an intermittent dewatering operation for high-speed rotation of the rotary tub 30.

Thereafter, the washing machine 1 'continues to operate the driving motor 110 (2275). In other words, the washing machine 1 'performs the main dewatering operation.

As described above, in the washing machine 1 'including the drain motor 73 and the mode switching motor 129 separately, water is left in the water tub 20 before the intermittent dewatering operation is started and the drain valve 72 is closed The rotary tub 30 can be rotated. As a result, the washing machine 1 'can solve the unbalance of laundry by loosening the laundry by rotating the rotary tub 30.

The operation of the washing machine 1 'for washing clothes has been described above.

Hereinafter, the operation of the washing machine 1 'for washing the inside of the washing machine 1' will be described.

Detergent residues and pieces of laundry may be adhered to the inner surface of the water tub 20 and the outer surface of the rotary tub 30. However, since the inner surface of the water tub 20 and the outer surface of the rotary tub 30 are not exposed to the outside, it is difficult for the user to clean the inner surface of the water tub 20 and the outer surface of the rotary tub 30.

FIG. 39 shows an example of a washing operation in which the washing machine according to another embodiment of the present invention is used to wash the water tub and the rotating tub.

First, the washing machine 1 'determines whether to perform cleaning of the water tank 20 and the rotary tub 30 (2310).

The user can input a cleaning command for washing the water tub 20 and the rotary tub 30 through the input unit 210 of the washing machine 1 '. When the washing command for the tub 20 and the rotary tub 30 is input, (1 ') can start the washing of the water tub (20) and the rotary tub (30).

If the wash command is input (YES in step 2310), the washing machine 1 'performs a water supply operation (step 2315). Specifically, the washing machine 1 'opens the water supply valve 53 to supply water to the water tub 20 and the rotary tub 30. [

During the water supply operation, the washing machine 1 'determines whether the water level of the water tank 20 is equal to or higher than the third reference water level 2320, and if the water level of the water tank 20 is equal to or higher than the third reference water level 2320 , The washing machine 1 'stops water supply (step 2325).

The washing machine 1 'can detect the water level of the water tank 20 based on the detection result of the water level detector 250, and can compare the detected water level with the third reference water level. Further, when the detected water level reaches the third reference water level, the washing machine 1 'closes the water supply valve 53.

Thereafter, the washing machine 1 'sets the operation mode of the clutch unit 120' to the dehydration mode (2330) and activates the drive motor 110 (2335).

The washing machine 1 'activates the mode switching motor 129 to switch the operation mode of the clutch unit 120' to the dehydration mode. When the mode change motor 129 is activated, the clutch lever 127 included in the clutch unit 120 'moves from the first position P1 to the second position P2, The rotational force of the rotary shaft 125 is transmitted to the pulsator rotation shaft 45 and the rotary shaft rotation shaft 35 and the brake belt 126 releases the rotary shaft rotation shaft 35.

When the drive motor 110 is operated after the clutch unit 120 'is switched to the dehydration mode, the rotary tub 30 and the pulsator 40 rotate.

In the space between the outer surface of the rotary tub 30 and the inner surface of the water tub 20 during the rotation of the rotary tub 30, a water flow is generated between the rotating tub 30 and the fixed water tub 20, The outer surface of the rotary tub 30 and the inner surface of the water tub 20 are cleaned.

While the driving motor 110 is operating, the washing machine 1 'determines whether the cleaning time is equal to or greater than the third reference time 2340. If the washing time is longer than the third reference time 2340, 1 'stops the operation of the drive motor 110 (2345).

Specifically, when the washing time of the water tub 20 and the rotating tub 30 exceeds the third reference time, the washing machine 1 'cuts off the power supply to the driving motor 110.

Thereafter, the washing machine 1 'performs a drain operation (2350). Specifically, the washing machine 1 'activates the drain motor 73 to open the drain valve 72.

As described above, the washing machine 1 'including the drain motor 73 and the mode switching motor 129 separately rotates the rotary tub 30 in a state in which the drain valve 72 is closed, The water tank 20 can be cleaned.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein; It will be understood that various modifications may be made without departing from the spirit and scope of the invention.

1: Washing machine 10: Cabinet
20: water tank 22a: pressure sensor
22b: Water level sensing tube 30: Rotor tank
35: rotating jig rotating shaft 40: pulsator
45: pulsator rotation shaft 50:
51: Water supply pipe 53: Water supply valve
60: detergent supply part 61: detergent case
63: detergent 70: drainage part
71: first drain pipe 72: drain valve
73: Drain motor 74: Drain hose
75: second drain pipe 100: rotation driving part
110: drive motor 111: motor casing
112: stator 113: rotor
115: motor rotating shaft 120: clutch unit
121: clutch housing 122: switching gear
123: reduction gear 124: clutch lever
125: clutch rotating shaft 126: brake belt
127: brake lever 200:
210: input unit 220:
230: speed detecting unit 231: position indicating member
233: Speed detection sensor 240:
250: water level detector

Claims (23)

An alternating-current motor for generating a rotational force;
A clutch unit for selectively transmitting the rotational force to the rotating tank and the pulsator;
A speed detector for detecting a rotation speed of at least one of the AC motor and the clutch unit;
And an intermittent dewatering operation for repeating supply of power to the AC motor and interruption of power supply in accordance with the rotation speed during a dewatering operation. The method according to claim 1,
Wherein the control unit interrupts power supply to the AC motor when the rotation speed is equal to or higher than the upper limit speed and supplies power to the AC motor when the rotation speed is lower than the lower limit speed. 3. The method of claim 2,
Wherein the upper limit speed and the lower limit speed are larger than the resonance frequency of the rotating tub. 3. The method of claim 2,
Wherein the upper limit speed and the lower limit speed are a speed between a speed of the first resonance region of the rotating tub and a speed of the second resonant region. 3. The method of claim 2,
Wherein the control unit further performs a main dewatering operation in which the power is continuously supplied to the AC motor during a predetermined dewatering time during the dewatering stroke. The method according to claim 1,
When the rotational speed is equal to or greater than the reference wash rate, the control unit interrupts power supply to the AC motor and supplies power to the AC motor such that the AC motor rotates in the opposite direction when the reference waiting time elapses A washing machine for performing an operation. The method according to claim 1,
The control unit interrupts power supply to the AC motor when the rotation speed is equal to or more than the reference wash rate and when the rotation speed is "0 ", the control unit switches the AC power to the AC motor so that the AC motor rotates in the opposite direction The washing machine comprising: The method according to claim 1,
A drive pulley coupled to a rotary shaft of the AC motor;
A driven pulley coupled to a rotational axis of the clutch unit;
And a pulley belt for transmitting the rotational force of the drive pulley to the driven pulley. 9. The method of claim 8,
The speed detector may include:
A position indicating member rotated together with the driven pulley;
And a speed detecting sensor fixed to the clutch unit and detecting the position indicating member. 9. The method of claim 8,
The speed detector may include:
A position indicating member rotated together with the drive pulley;
And a speed detection sensor fixed to the drive unit and detecting the position indicating member. A control method for a washing machine including an alternating-current motor for generating a rotating force and a clutch unit for selectively transmitting the rotating force to a rotating tank and a pulsator,
Detecting rotation speed of at least one of the AC motor and the clutch unit,
And repeating power supply to the alternating-current motor and disconnection of power supply in accordance with the rotation speed at the time of dewatering. 12. The method of claim 11,
Repeating power supply to the alternating-current motor and interrupting power supply,
And stopping power supply to the alternating-current motor when the rotation speed is equal to or higher than the upper limit speed, and supplying power to the alternating-current motor when the rotation speed is lower than the lower limit speed. 13. The method of claim 12,
Wherein the upper limit speed and the lower limit speed are higher than the resonance speed of the rotating tub. 13. The method of claim 12,
Wherein the upper limit speed and the lower limit speed are speeds between a first resonance speed and a second resonance speed of the rotary tub. 13. The method of claim 12,
Repeating power supply to the alternating-current motor and interrupting power supply,
Further comprising continuously supplying power to the AC motor during a predetermined dewatering time. 12. The method of claim 11,
When the rotational speed is equal to or higher than a reference wash rate during a washing cycle, the power supply to the alternating-current motor is cut off;
And supplying power to the AC motor when the reference waiting time has elapsed. An alternating-current motor for generating a rotational force;
A clutch unit operating in a washing mode for transmitting the rotational force to the pulsator and a dehydrating mode for transmitting the rotational force to the rotating tank and the pulsator;
A drain valve for opening / closing a drain pipe for discharging water contained in the water tank;
And a control unit that opens the drain valve, closes the drain valve when the water level of the water tank reaches the reference water level, switches the operation mode of the clutch unit to the dehydration mode, and operates the AC motor,
Wherein the reference water level is lower than the bottom surface of the rotating tub and higher than the bottom surface of the water tub. 18. The method of claim 17,
A drain motor for driving the drain valve;
And a mode switching motor for switching an operation mode of the clutch unit. 18. The method of claim 17,
Further comprising a speed detecting portion for detecting a rotational speed of at least one of the AC motor and the clutch unit,
Wherein the controller reopens the drain valve when the rotational speed reaches a residual water discharge speed. 20. The method of claim 19,
Wherein the residual water discharge speed is changed according to an amount of the laundry accommodated in the rotary tub. 21. The method of claim 20,
And the residual water discharge speed is equal to the resonance frequency of the rotating tub. 21. The method of claim 20,
Wherein the controller is configured to interrupt power supply to the AC motor when the rotation speed is equal to or higher than the upper limit speed,
And the residual water discharge speed is equal to the upper limit speed. 21. The method of claim 20,
And the residual water discharge speed is smaller than the resonance frequency of the rotating tub.

Images