KR100892747B1 - Elevator including elevator rescue system - Google Patents

Abstract

The elevator 2 controls a car 4, a drive motor 10 for driving the car 4, and a motor drive unit 26 for controlling the drive motor 10 and supplying power to the drive motor 10. , An encoder 20 for detecting movement of the car 4, and an elevator rescue system 40 for rescue operations in an emergency situation, wherein the elevator 2 is a stage for normal operation and rescue operation. One encoder 20 is included.

Description

Elevator including elevator rescue system {ELEVATOR INCLUDING ELEVATOR RESCUE SYSTEM}

The present invention is a car, a drive motor for driving the car, a motor drive unit for controlling the drive motor and supplying power to the drive motor, an encoder for detecting the movement of the car (encoder), for emergency rescue work In particular, it relates to an elevator comprising an elevator rescue system for moving a car to landing in an emergency.

Such elevators are known in the art, for example by Applicant's GEN2 ^® elevator system using two encoders, one for steady state and one for rescue operation, which is applied to the service panel board of the elevator rescue system. Connected. This structure encoder is only used for the visualization of the car movement to provide an indication of the direction of movement and possibly warning of overspeed to the person in charge of operating the service panel board in case of emergency. Thus, a low resolution, low cost type encoder is used as the structure encoder.

Most common emergencies are due to power failure of the main power supply to the elevator. In this situation, power to the drive motor is cut off and the brakes fall in to stop the movement of the elevator car regardless of the position of the elevator in the elevator shaft. Thus, passengers are trapped in the elevator car. Another emergency may be due to defects in the elevator itself, such as defects in safety chains, elevator controls, and the like. In this emergency, it is urgent to free the passengers from the elevator as soon as possible.

During normal operation, the encoder is typically a high resolution type encoder in order to provide the elevator control with accurate data about the speed and position of the elevator car. Typically, such an encoder is wired to the motor drive unit, but the service panel board or elevator rescue system is not wired to the other components. Thus, such an elevator system includes two encoders of different functional requirements that are wired to different components of the elevator system.

Therefore, it is an object of the present invention to simplify existing elevator systems, reduce the number of individual parts, and maintain safety standards while reducing costs.

According to one embodiment of the invention, this object is solved by using only one single encoder for normal work and rescue work, preferably the high resolution encoder. "High Resolution Encoder" provides a "low resolution encoder" substantially more pulses. For example, a high resolution encoder can provide 5 times more pulses per revolution than a low resolution encoder, and preferably can provide approximately 5 to 200 times more pulses. Typical low resolution encoders provide approximately 50 to 100 pulses / rotation, while high resolution encoders provide approximately 1000 to 4000 pulses / rotation.

The encoder is preferably connected to the motor drive unit via an elevator rescue system. For rescue operations in rescue mode, the encoder is connected and preferably wired to the elevator rescue system, where the elevator rescue system can transmit the encoder signals or any signals derived from the encoder to the motor drive unit. It is similarly connected to the drive unit. Thus, the motor drive unit will receive encoder signals during normal operation from a connection via an elevator rescue system instead of connecting a separate normal operation encoder.

A further disadvantage of the prior art elevators is that, despite having separate encoders, this concept does not provide redundancy for encoder failure. In particular, the encoder for normal operation only functions during normal operation, while the encoder for rescue operation only operates in rescue mode. Accordingly, according to one embodiment of the present invention, the motor drive unit receives generator power from the drive motor when the drive motor is operated in the generator mode, and is supplied to the drive motor in the drive mode and the generator mode of the drive motor, respectively. Based on the electric power received from the motor, the moving speed of the car, the load condition, and the like are derived. With this kind of configuration, even if the elevator system includes only one encoder, surrogate functionality for encoder failure can be provided. For example, elevator control is provided by motor drive in the event of an encoder failure during normal mode, but the elevator can continue to move to succession so that passengers can exit the car without being trapped in the car somewhere in the elevator shaft. There will be. It should be noted that this is a substantial improvement compared to conventional elevators which stop immediately in case of encoder failure. This feature can also be used if the elevator comprises more than one encoder.

The elevator rescue system preferably includes a service panel board that is spatially separated from the motor drive unit. Such service panel boards are typically arranged outside the elevator shaft and allow the responsible person to operate the elevator in rescue mode in rescue situations.

The encoder is only connected to one single speed control or speed control circuit. Such a speed control can be provided as part of the elevator rescue system and in particular in the service panel board. Alternatively, this speed control may also be provided after the motor drive unit or as part of the motor drive unit. In a first alternative, the encoder data is conveyed in car speed values, which are conveyed from the elevator rescue system to the motor drive unit. In a second alternative, the elevator rescue system uses the encoder data to derive relevant information and provides the encoder data to a single speed control associated with the motor drive unit providing the car speed to the motor drive unit. In this case, the speed controller can be integrated with the motor drive unit.

The emergency rescue system preferably further includes an emergency power supply for supplying emergency power to the motor drive in case of an emergency. The emergency power supply unit may include a storage battery and a voltage booster for increasing the output voltage of the storage battery.

The elevator preferably further comprises a brake to stop the movement of the car in an emergency situation, the elevator rescue system further comprising an emergency brake switch for connecting and shorting the power of the emergency power supply to the brake.

In elevators, including hoists and hoisting ropes that tie cars and counterweights, two different emergencies exist. One emergency situation is that the car and counterweight are in an unbalanced situation, ie when the brake is lifted, the car starts to move by gravity. US 6,196,355 B1 discloses an electric elevator rescue system for evacuating passengers in this situation. However, there is also an unbalanced load situation, ie the car remains in place even after the brake is lifted. Typically, this balanced load situation is not uncommon, due to the fact that elevators are designed to be in a balanced situation for most common operating conditions.

US-A-5,821,476 allows moving elevator cars even under balanced load situations, but this document presents a relatively complex rescue device.

The elevator rescue system further includes an emergency drive switch for connecting and disconnecting power from the emergency power supply to the drive motor to move the car in an "balanced" emergency situation. The elevator rescue system may further comprise a power line connecting the emergency power supply to the motor drive unit and including an emergency drive switch.

Thus, this embodiment uses a motor drive unit already present in the elevator to supply emergency power to the drive motor. Typically, the motor drive unit has an input for an AC main power supply, a rectifier, a DC intermediate circuit and a converter. The emergency power supply line can be connected to an AC input or a DC intermediate circuit, depending on the particular motor drive unit. The converter may be of a variable frequency inverter (VF) type or a variable voltage variable frequency inverter (VVVF) type. By using a conventional motor drive unit of the elevator, the number of additional parts of the elevator rescue system can be reduced.

The switches may be conventional switches or may include other types of switching means, ie form part of the microprocessor control. In particular, the emergency drive switch means may be integral with the motor drive unit. The emergency drive switch means can be designed to automatically switch to an emergency power supply mode in all or specific failure situations. It is also possible to remotely initiate rescue operations, for example, remotely from a central control room in a building or outside a building or even from a building.

The emergency power supply preferably provides at least two different output voltages, the brake being connected to the low voltage output via an emergency brake switch, and the higher voltage output being connected to the motor drive unit.

The emergency power supply unit preferably includes a battery and a voltage booster for increasing the output voltage of the battery. The emergency power supply may further include a battery loading circuit and a supervisor connected to the main power supply. The voltage booster may be a conventional converter that converts the battery voltage to a higher voltage to be supplied to the motor drive unit. In normal operation, a conventional motor drive unit accepts an AC voltage on the order of 380 V. However, the voltage required to drive an elevator car in a balanced load situation is much smaller than the voltage required for normal operation. Thus, particularly with the VVVF inverter type, the drive motor requires low voltages for practical emergency work. On the other hand, the motor drive unit circuit may require a predetermined input voltage independent of the specific output voltage. Therefore, the higher output voltage of the emergency power supply should be at least about 250V, preferably at least 300V, more preferably at least 320V, and most preferably at least about 350V. Thus, the higher voltage may be different depending on the normal voltage required by each of the drive motor and motor drive unit circuit. Lower voltages need to be sufficient to lift the brakes. However, since the brake is preferably connected to the speed control even in the emergency mode, the lower voltage is preferably high enough to be used as an input voltage for the speed control circuit. Typical voltage is approximately 24 V. The DC battery of the emergency power supply may have a nominal voltage of 12 V or 24 V. However, even in the case of a 24 V battery, it is also desirable to use a booster circuit for emitting a lower voltage from the emergency power supply to ensure a constant voltage output.

Alternatively, if the battery voltage is large enough to supply the voltage for the brake lifting, the voltage for the electrical control devices and the voltage for the motor drive unit, it is also possible to use an emergency power supply without a booster. There are motor drive units requiring only 48 V of voltage, so a 48 V supply of batteries is sufficient. In order to supply the required voltage to the emergency brake and / or electrical control devices, it is desirable to provide a voltage reducing means such as a voltage divider in the emergency power supply to supply a low voltage instead of 48 V, for example 24 V and / or 12 V. It may be desirable.

The emergency brake and the motor drive unit are preferably coupled to each other in such a way as to activate the drive motor only when the brake is activated. This coupling ensures that the brake is lifted before powering the drive motor. This can be done, for example, by mechanically or electrically coupling the respective switches. A particularly simple structure is to position the emergency brake switch relative to the emergency drive switch so that it is impossible to switch the emergency drive switch before the emergency brake switch is switched. Those skilled in the art will be able to implement this solution. Coupling of the switches is an easy mechanical solution. However, any other implementation can be used to ensure the lifting of the brake before supplying power to the drive motor. The brake and the motor drive unit are preferably coupled to each other in a manner that enables activation of the brake only when the motor drive unit is activated.

The brake and the motor drive unit are preferably coupled to each other in a manner that enables activation of the brake only when the motor drive unit is activated. The coupling is such that the brake is activated only when the motor drive unit is in the operating mode. Activating the motor drive unit prior to the brake ensures that the motor drive unit can control the movement of the car when the brake is lifted. There are motor drive units that can monitor car movements very closely. Thus, such a motor drive unit can monitor whether the car starts moving after the brake is lifted or whether the car is in a balanced load situation. This motor drive unit can also activate the brake to control the speed of the moving car and to avoid any overspeed situations. Moreover, the motor drive unit is also on the path of the car, such as the data of the system of the elevator just before the failure, ie the current and voltages supplied to the motor in relation to the load situation of the car, the distance to the next landings. It may also include a data storage medium containing data such as the location of the car. For example, this memory may be an EEPROM or the like. The motor drive unit uses the data to determine how to operate the car in an emergency, i.e. to move the car by gravity, to power the drive motor to move the car, in which direction the car is moved, and so on. It is available. In other words, such coupling can be achieved by mechanical or electrical coupling.

It is also possible to activate the brake and the motor drive unit simultaneously or at about the same time.

The elevator preferably further comprises a main power switch for shorting the main power supply and the elevator, wherein the emergency brake and / or emergency drive switches can only activate the brake and / or drive motors respectively if the main power supply is shorted. It is coupled to the main power switch in such a way that it is. In other words, the coupling of the switches can be realized in the manner mentioned above. For safety reasons it is desirable to short the mains power supply before commencing rescue operations. Thus, before main power is reconnected to the elevator, the emergency task can be stopped in a controlled manner. Without this feature, if main power is interrupted during rescue operations, unguaranteed or undefined phenomena may occur, and even if an emergency power supply supplies some of the elevator components, the main power may not be supplied to the elevator. will be.

The elevator preferably further comprises a safety chain connected to the safety chain input of the motor drive unit, wherein the emergency power supply has a safety chain voltage output for providing a safety chain voltage to the safety chain input of the motor drive unit via the emergency drive switch. Include. The safety chain typically includes a plurality of safety contacts such as door contacts arranged in series with each other. The safety chain allows the elevator drive motor to operate only when all safety contacts are closed, ie when the elevator is in a safe state. In the event of an electrical failure, the power supply to the safety chain is also cut off. Thus, no voltage is applied to the safety chain input of the motor drive unit. In order to enable the motor drive unit to drive the drive motor in rescue mode, it is necessary to provide a "faked" safety chain voltage to the safety chain input of the motor drive unit. Such voltage may also be provided by an emergency power supply. The safety chain voltage is typically between a higher voltage and a lower voltage, for example between 48 V DC and 110 V DC. Alternatively, the emergency power supply may supply its own power to the input of the safety chain. In this case, all safety chain contacts need to be closed to allow movement of the elevator car even in rescue mode.

The motor drive unit preferably further comprises a control input connected to the voltage output of the emergency power supply via an emergency drive switch, the motor drive unit being in emergency rescue mode if a predetermined voltage output is applied to its control input. Is designed to provide power to the drive motor. In normal operation, the motor drive unit receives control signals from its elevator control via its own control input. However, since the elevator control unit does not function in the rescue mode, an emergency rescue mode signal needs to be generated and supplied to the control input of the motor drive unit. The preset voltage preferably corresponds to the lower voltage output of the energy power supply. This structure makes a separate emergency elevator control unnecessary.

The elevator preferably further comprises a door zone indicating device, which is connected to an elevator rescue system which stops the car at the landing upon signaling that the car is located at the landing. The door zone indicator device is a common component in an elevator and is necessary for proper operation of the elevator. Typically, the door zone indicator device signals access to the landing and leveling in the landing. Even in the case of rescue operations, door zone marking devices are used in elevator rescue systems to ensure accurate positioning of elevator cars at landings. The door zone indicator device preferably stops the car at the next landing where the elevator door can be manually opened by an operator operating the rescue system or automatically opened by the elevator rescue system.

The elevator preferably further comprises a speed control unit for controlling the speed of the car, which speed control unit is connected to the elevator rescue system and in particular to the brake.

Another common emergency is caused by an encoder failure. Typically, elevator systems do not have a spare encoder. In case of encoder failure, the elevator must be stopped. Thus, if an encoder failure occurs while the elevator car is moving, the power to the drive motor and emergency brake is cut off and the car is stopped immediately. As a result, the passengers are trapped in the car and must be exited by a technician or responsible person who initiates rescue operations and moves the car with the passengers to the next available succession. One alternative is to provide additional encoders and provide sufficient surrogate functionality. However, this will incur additional costs. According to one embodiment of the invention, this problem can be avoided by a method of using information on the movement of the car guided by the motor drive unit as surrogate function in the case of an encoder failure. By doing so, there is no need to stop the car immediately when an encoder failure is identified. Instead, using the information about the movement of the car guided by the motor drive unit controlling the movement, the car can safely continue to the landing. The method according to this embodiment of the invention is disclosed in claim 9. Movement of the car continues until the next available landing. The term "next available" landing can be safely accessed, not if the next landing in space in the direction of travel, especially if the distance required by the car for a stable deceleration is longer than the next landing. Refers to a landing, which may be the next second, then third, etc. landing.

The movement of the car is preferably continued at a reduced speed compared to the normal speed of movement of the car. Thus, if the occurrence of an encoder failure is detected, the speed of movement of the car is reduced from the normal speed to a lower speed suitable for completing the movement in rescue mode. The movement of the car then continues at a reduced speed until the desired succession is reached.

The implementation of this feature substantially improves the elevator system because unnecessary confinement of passengers can be avoided.

Embodiments of the present invention will be described below in more detail with reference to the drawings.

1 is a schematic diagram of elevator parts in accordance with one embodiment of the present invention;

2 is a schematic view of an elevator in accordance with one embodiment of the present invention having more detailed components;

3 is a schematic view similar to that of FIG. 1, showing portions of a prior art elevator.

3 shows a drive motor 10 of an elevator with a main encoder 19 and a structural encoder 20 attached to a shaft 14. The motor drive unit 26 is also connected to the main encoder 19 by line 21. The rescue encoder 20 is connected to the elevator rescue system 40 via a line 22. The elevator rescue system 40 provides power to the motor drive unit 26 via line 41 to drive the drive motor 10. The encoder information of the main encoder 19 provided to the drive 26 is used in the case of normal operation, while the encoder information of the structure encoder 20 provided to the elevator rescue system 40 is used only for rescue operations. .

In comparison, embodiments of the present invention as shown in FIGS. 1 and 2 include only one encoder 20, which provides encoder information to elevator rescue system 40 via line 22. The additional line 23 conveys this encoder information from the encoder 20 to the motor drive unit 26 via the line 22 and the elevator rescue system 40. Line 41 serves to supply power from the elevator rescue system 40 to the motor drive unit 26 during rescue operations.

If encoder 20 requires power supply during operation, power supply to encoder 20 may be provided via line 22, so that power supply to encoder 20 may be any of the normal and rescue operations. In one case it may be provided via an elevator rescue system. Alternatively, a separate power supply may be provided during normal operation (not shown in the figures).

2 shows an elevator 2 comprising a car 4 and a counterweight 6. The car 4 and counterweight 6 are suspended on the hoisting rope 8. The hoisting rope 8 is driven by the drive motor 10 via a traction sheave 12. The brake disc 16 of the brake 18 is attached to the shaft 14 of the drive motor 10. Also attached to the shaft 14 is an encoder 20 that provides speed control information to line speed control 24 via line 22.

The motor drive unit 26 is connected to the main power supply 30 of the elevator 2 via a line 28 and receives control signals from the elevator control 34 via a line 32. According to the control signals of the elevator control unit 34, the motor drive unit 26 supplies the necessary power to the drive motor 10 via the line 36. In particular, motor drive unit 26 includes a rectifier for rectifying AC current received through line 28, an intermediate DC circuit, and a Variable Voltage Variable Frequency (VVVF) inverter. The VVVF inverter changes the voltage and frequency output to the drive motor 12 via the line 36 in accordance with the control signals of the elevator control unit 34.

The elevator 2 is formed, on the one hand, of the conventional components of the elevator system, namely the motor drive unit 26 and the speed control 24, and on the other hand a further configuration specific to the elevator rescue system 40. It further comprises an elevator rescue system 40 formed of elements. These additional components include an emergency power supply 42, an emergency brake switch 44 and an emergency drive switch 46.

The emergency power supply 42 includes a battery 48, a voltage booster 50, and a battery loading and supervising circuit 52. The emergency power supply provides three different output voltages: the lower voltage to the voltage output 54, the higher voltage to the output 56 and the intermediate voltage to the output 58. Depending on the particular elevator, the voltage values can be variable. However, the typical voltage values for lifting the brakes and supplying electrical control devices such as speed control, etc. are 24 V DC, the typical voltage used in elevator safety chains is 110 V, the motor drive unit 26 and eventually Typical voltage for supplying drive motor 10 is 350V. The latter voltage depends on the specific structure of the motor drive unit 26. Typically, such a motor drive unit 26 requires a minimum input voltage, although it is normal for the output voltage to the drive motor 10 to be much smaller in a balanced load emergency operation mode.

The lower voltage is supplied to the emergency brake switch 44 through line 60 and through the solenoid (not shown) of the brake 18. The speed control switch 62 is controlled by the speed control unit 24. The latter receives its own information about the speed of the elevator car from the encoder wheel 20 via line 22. Speed control 24 also receives information from door zone indicator (DZI) 64 via line 66. The door zone indicator 64 is connected with the door zone sensor 68 via a line 70. The door zone sensor 68 signals the speed control 24 when the elevator car approaches and reaches the landing 72. Accordingly, the speed controller can stop the power supply to the brake 18 in the case of overspeed of the elevator car 4 or when the elevator car 4 reaches the landing 72.

The higher voltage is supplied from output 56 via line 74 to power input 76 of motor drive unit 26. Emergency drive switch 46 is disposed in line 74. The intermediate voltage is supplied from the output 58 to the safety chain input 80 of the motor drive unit 26 via line 78. Moreover, the lower voltage from the output 54 is connected via the control signal input 84 of the motor drive unit 26 via line 82.

Emergency drive switch 46 actually includes three switches in lines 82, 74, and 78. Thus, the emergency drive switch 46 jointly switches low voltage, medium voltage and higher voltages to the motor drive unit 26. However, it is not necessary to switch the voltages together with the motor drive unit 26. Thus, three separate switches may be provided instead of the common emergency drive switch 46.

The elevator 2 further comprises a main power switch 86 arranged in the main power supply line 30. Even if the main power supply can be restored during the emergency mode, it is desirable to short the main power supply from the elevator 2 before initiating the emergency drive mode of operation to ensure well defined operating conditions. The main power switch 86 is mechanically or electronically connected with the emergency drive switch 46 and / or the emergency brake switch 44. In this regard, it should be noted that only some of the connections between the main power supply line 30, the elevator control 34 and the individual elevator components are shown in the figures for illustrative purposes. For example, the drawing does not typically show a safety chain that is connected to the elevator control 34. The main focus of FIG. 2 relates to the single encoder concept for an elevator.

The switches 44, 46 and 86 are preferably arranged in a convenient position next to the elevator 2, for example integrated in a control panel (not shown). The switches may also be located away from the elevator, for example in a building control room.

It should be noted that the figures are very schematic and specifically show a variety of separate controls, switches, etc., some or all of which may be integrated into the motor drive unit 26. In particular, the speed control 24, the speed control switch 62 and / or the door zone indicator 64 may also be part of the motor drive unit 26. It may also be possible to employ an emergency brake switch 44 in the motor drive unit 26. In this case, a single manually operated switch, such as switch 46, may be sufficient to activate the motor drive unit and initiate an emergency operation governed and controlled by the motor drive unit.

Operation of the elevator 2 in the event of an encoder failure can be made as follows:

During normal operation, the motor drive unit evaluates a signal indicative of the speed of the elevator car 4 from the available data voltages, currents, frequencies, etc. of the power delivered to or received from the motor 10 in generator mode. Evaluate. If any inconsistency between this data and the data provided by the encoder 20 is detected, especially if the encoder data is stopped, the elevator will switch to the "encoder rescue mode" and will probably slow down the elevator car 4 down. It further moves the elevator car 4 in the direction of movement to the next landing 72 which can be accessed. Only at this landing 72 the car 4 is stopped, the doors are opened to allow passengers to exit the car 4 and the car 4 is stopped by actuating the brake 18.

Operation of the elevator in other emergencies, such as electrical failures, can be made as follows:

Mode 1:

After the elevator failure is detected, the technician or any other responsible person switches the switch 44, thus supplying a lower voltage to the brake 18 and lifting the brake. If the elevator 2 is in an unbalanced state, the elevator car and counterweights 4 and 6 will each start to move. The speed control unit 24 monitors the speed of the elevator car 4 and stops the car 4 if an overspeed condition occurs. Eventually, the sensor 68 has an elevator car 4 in the door zone, each signal being transmitted via line 70 to the door zone indicator 64, the speed control 24 and the speed control switch 62. Sense whether the power supply to the brake 18 is disturbed. Thus, the elevator car 4 is stopped at the landing 72. The responsible person can then manually open the elevator shaft door 86 and the elevator car door. If the car 4 is not moving within a fixed time, the emergency brake switch 44 can be closed. In this case, the rescue operation in mode 1 may be retried once or twice (or several times). As a result, if the elevator car 4 does not reach the landing 72 in the rescue operation in mode 1, the operator will start rescue operation in mode 2.

Mode 2:

In rescue operation of mode 2, the operator switches the emergency drive switch 46, thus switching the motor drive unit 26 to a low voltage, an intermediate voltage and a higher voltage. The low voltage received through the control input 84 signals the motor drive unit 26 to the rescue drive mode, ie low power, slow speed and the like. Moreover, a low voltage is supplied to the brake 18 via line 88 and lifts the brake. Thus, mechanical coupling of emergency brake switch 44 and emergency drive switch 46 is not necessary. The intermediate voltage "fakes" with a positive safety chain signal at the safety chain input 80, ie the motor drive unit 26 acquires the signal as if the safety chain (not shown) is operating properly and all Signals that safety chain contacts are closed. The drive motor 10 slowly moves the elevator car 4 in either direction until the sensor 68 signals the door zone indicator 64 that the elevator car 4 has reached the landing 72. I will. If so, the speed controller 24 will trigger the brake 18 and stop the car 4 at the landing 72. The operator can then manually open the emergency drive switch 46. Alternatively, there is an automatic system that blocks the supply of power to the motor 10 via line 36. The worker reopens the elevator door at the landing 72, allowing trapped people to exit the elevator car 4.

Alternatively, the operation of the elevator 2 in an emergency situation can be as follows:

After the elevator failure is detected, the technician or the responsible person switches the switch 46, thus supplying the lower, intermediate and higher voltages to the motor drive unit 26. The motor drive unit 26 determines the data stored in the storage whether the elevator system is in a balanced load situation or not. The motor drive unit then opens the brake 18 and allows the car 4 to move due to gravity, depending on the load situation, while monitoring or controlling the speed of the car via the speed controller 24, or Power is provided to the motor 10 to move to the next landing. When the door zone indicator 64 signals that the car 4 is in the proper position for escape, the motor drive unit 26 stops the car by the brake 18. Again, the operator opens the door at the landing 72 and allows trapped passengers to exit the elevator car 4.

The present invention simplifies existing elevator systems, reduces the number of discrete components, and saves cost while maintaining safety standards.

Claims (11)

In the elevator (2), A car 4, a drive motor 10 for driving the car 4, a motor drive unit 26 for controlling the drive motor 10 and supplying power to the drive motor 10, the car 4 An encoder 20 for detecting the movement of the car, and an elevator rescue system 40 for rescue work in case of an emergency, The motor drive unit 26 receives generator power from the drive motor 10 when the drive motor 10 is operated in a generator mode, and the motor drive unit 26 receives power of the drive motor 10. It is adapted to derive information about the movement of the car 4 based on the power supplied to or received from the drive motor 10 in each of the powered mode and the generator mode. The elevator rescue system 40 uses information about the movement of the car 4 guided by the motor driver unit 26 that controls the movement of the car 4, so that in case of failure of the encoder, Elevator (2), characterized in that to keep moving the car. The method of claim 1, And the encoder (20) is wired to the motor drive unit (26) via the elevator rescue system (40). The method of claim 1, Elevator (2), characterized in that the encoder (20) is a high resolution encoder. The method according to any one of claims 1 to 3, The elevator rescue system (40) comprises a service panel board spaced apart from the motor drive unit (26). The method according to any one of claims 1 to 3, The encoder (20) is characterized in that it is connected to only one speed control (24). The method according to any one of claims 1 to 3, The elevator rescue system (40) further comprises an emergency power supply (50) for supplying emergency power to the motor drive unit (10) in case of an emergency. The method of claim 6, A brake 18 is further included to stop the movement of the car 4 in an emergency situation, and the elevator rescue system 40 connects and disconnects power from the emergency power supply 50 to the brake 18. Elevator (2) characterized in that it further comprises an emergency brake switch (44). In the method of performing an elevator rescue operation when a failure of an encoder occurs while the elevator car 4 is moving, The elevator 2 includes a car 4, a drive motor 10, a motor drive unit 26 for controlling the drive motor and supplying power to the drive motor, and an encoder 20 for detecting movement of the car 4. Wherein the motor drive unit 26 receives generator power from the drive motor 10 when the drive motor 10 is operated in a generator mode, and the motor drive unit 26 includes the drive motor. Information regarding the movement of the car 4 based on the power supplied to or received from the drive motor 10 in each of the powered mode and the generator mode of 10 is obtained. To induce, (a) identifying a failure of the encoder; (b) using information relating to the movement of the car (4) guided by the motor drive unit (26) to continue the movement of the car and to control the movement. The method of claim 8, The movement of the car (4) is continued until it reaches the next movable landing (72). The method according to claim 8 or 9, The movement of the car (4) is continued at a reduced speed. delete

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