JPS60113643A - Disc type brushless motor with one position detector - Google Patents

Abstract

PURPOSE:To self-start a magnet rotor by suitably disposing calking generating means and an IC for a drive circuit with respect to an armature coil. CONSTITUTION:A square case 9 for a disc brushless fan motor has a central hole 10, and a bearing forming projection 9a is formed on the inner periphery of the hole 10. The rotational shaft 13 of a fan motor FM is supported by bearings 11, 12. An armature 1 has an armature coil 4, and a cup unit 20 with a fan is disposed oppositely to the coil 4. A rotor yoke 27 and a field magnet 2 are fixed to the unit 20. Calking generating means 15 is disposed at the position separated at the prescribed distance from a conductor which contributes to the torque generated from the coil 4 to self-start a field magnet 2, and an IC6 for a drive circuit is disposed out of the armature coil occupying position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk-type brushless motor having one position sensing element and which is energized in one phase.

BACKGROUND ART Conventionally, as various devices have appeared, there has been a demand for brushless motors suitable for these devices, especially disk-type brushless motors. This disc type brushless motor can also be used as a disc type brushless fan motor used in office equipment, etc.
Depending on the device to which it is applied, it is required to be extremely inexpensive, small, and extremely flat.

Here, the one that best satisfies this condition is one armature coil and one position sensing element (one phase (
This motor is a coreless type disc type brushless motor (which is energized), but although this motor can rotate the magnetic rotor over a predetermined range, it cannot be rotated continuously. Building a motor was complicated. Furthermore, even if one armature coil can rotate a brushless motor with one position detection element, a strong rotational force cannot be obtained with only one armature coil.

For this purpose, it is necessary to use two or more armature coils.

Conventionally, a disk-type brushless motor having two armature coils as a stator armature requires two position detection elements. Here, a magneto-electric transducer such as a Hall element or a Pole IC is often used as the position sensing element, but since this position sensing element is expensive, it is preferable to use only one piece because it is inexpensive and small. This is preferable in that the disk type brushless motor can be mass-produced. However, if there is only one position sensing element, if there is only one telephone coil,
When starting the motor, this element
It has a drawback that it cannot self-start if it detects the boundary between k and S pole, that is, a dead point. To this end, it is desirable to obtain a two-coil disc-type brushless motor that can be self-starting even with one position sensing element, has good efficiency, and is inexpensive. Further, in the disk type brushless fan motor, it is desirable that the stator armature having two armature coils is provided with an energization control circuit/(drive circuit), and the stator armature including the circuit is made extremely flat.

The present invention has been made based on the above circumstances, and includes two armature coils that are extremely flat in the axial direction and can self-erect even if there is only one position sensing element, 2p (p is a positive integer of 2 or more). The purpose of this invention is to provide a disc-type brushless (fan) motor that is inexpensive and has excellent mass productivity and has a magnetic rotor with low distortion.

The object of the present invention is to provide a 2p (p is an integer of 2 or more) pole magnet rotor having GJi tM of 1-J and S alternately, and a magnetic rotor with an opening angle width equal to the stem facing the magnet rotor in a plane. A stator armature consisting of two armature coils formed in a stator armature, one position sensing element, and one position sensing element having means for generating coking so that the magnet rotor can start automatically. In a disc-type brushless fan motor, the means for generating L-coking is located approximately 1/4 magnetic pole width in front of the conductor portion that contributes to the generated torque of the L distribution armature coil in the rotational direction of the magnetic rotor. It is provided so as to generate coking at the position or a position under conditions equivalent to the position, and is formed with or without the position detection element listed in L, and is formed to have a thickness equal to or less than the height of the ball distribution pseudo-coil. This is achieved by providing a disk-type brushless motor having one position detection element characterized in that the drive circuit IC is disposed outside the armature coil occupation position on the L distribution armature coil arrangement surface.

Hereinafter, a case will be described in which the disc-type brushless motor of the present invention is applied to a disc-type brushless fan motor as an example.

FIG. 1 is a longitudinal cross-sectional view of a disc-type brushless fan motor FM with one position detection element, two coils, six poles, and one phase of current. The axially flat rectangular case 9 (2 (see Fig. G in S2)) for a cup-shaped disk-shaped brushless fan motor made of, for example, a magnetic material has a central through hole 10, and the inner periphery of the through hole 10 is The portion is provided with a bearing forming protrusion 9a extending upward.

Bearings 11 and 12 are provided at openings at both upper and lower ends of the inner peripheral portion of the protrusion 9a. A rotary shaft 16 is rotatably supported by the bearing if, 12 approximately at the center of the main body of the disc-type brushless fan motor FM.

An E-ring 14 for preventing removal is attached to the lower part of the rotating shaft 16. Reference numeral 21 indicates a recessed portion of the case 9 (see Fig. 2);
22 is an air hole provided at the bottom of the case 9, 23
is a stay, and 24-1 and 24-2 are a positive power cord and a negative power cord, respectively. Reference numeral 9b denotes a column provided in the case 9. On the inner surface of the case 9, which is 180 degrees symmetrical with this column 9b, there is a column 9b (not shown) similar to the column 9b described above.
is provided.

A printed circuit board 6 is fixed to the tops of the two pillars 9b by screws to be described later. Two armature coils 4 are arranged 180 degrees symmetrically on the printed circuit board 3, as shown in FIG. The two armature coils 4-1.4-
2 forms a stator armature 1. At a position facing the stator armature 1, a fan-equipped cup body 20 made of plastic and flat in the axial direction as shown in FIG. 3 is opposed. 25 is a cup body 20 with a fan
A fan is integrally formed with the cup body on the outer periphery of the cup body.

A hahos portion 26 is integrally formed approximately at the center of the inner surface of the L-shaped cup body 20, and the upper end portion of the rotating shaft 16 is fixed to this boss portion 26 so as to rotate integrally therewith. An annular rotor yoke 27 is fixed to the inner surface of the cup body 20. On the lower surface of the rotor yoke 27, an annular field magnet (ball field magnet (magnet rotation f) 2) having N and S magnetic poles alternately as shown in FIG. 5 is fixed.
It is made to face the stator armature 1. On the surface of the printed circuit board B facing the field magnet 2, as shown in FIG. The two armature coils 4 are arranged 180 degrees symmetrically so as not to overlap each other as described above. A drive circuit IC 6 is disposed on the printed circuit board 6 outside the positions occupied by the two armature coils 4-1 and 4-2. The drive circuit IC 6 is connected to the armature coil 4. -1.4-2 or less in size and is for one-phase current conduction. Incidentally, since the conductor portion 4b in the circumferential direction of the armature coil 4 does not contribute to the generated torque, it is sufficient to use a field magnet 2 having a radius as small as the width of the conductor portion 4b. still,
Since the field magnet 2 used has four poles, the armature coil 4 has an opening angle of 90 mm of the conductor portion 4a that contributes to the generated torque.
It is formed into a degree. The most suitable position is to arrange the magnetoelectric transducer 5 such as a Hall element or Hall IC used as a position detection element on the conductor part 4a that contributes to the generated torque. Since the thickness increases by that amount, the air gap between the field magnet 2 and the armature coil 4 increases, making it impossible to obtain a strong rotational torque, and making the arrangement very cumbersome and unsuitable for mass production. Become. Therefore, the element 5 is arranged on the lower surface of the flint board 6 facing the conductor part 4a.In order to do this, the magnetoelectric transducer 5 is housed in the main line of the armature coil hole. In Figure 1, x-x of 412I
'A line cross-sectional view is shown. Said screw 15-1.
15-2 is a shape and size such that the areas facing the respective predetermined N and S magnetic poles of the field magnet (magnet rotor) 2 are approximately equal when the motor is stopped;
I'm using one. Such a screw 15-1.15-
2, the armature coil 4-1. , 4-2(
7) Conduction '2F that contributes to generated torque 6. ”: 4 a
Approximately 1/4 magnetic pole (in this example, 4 (M
Since the field magnet 2 is used, the field magnet 2 is always positioned at the front position (22.5 degrees) when stopped or started. That is, as described above, the screw 15-1.15-2 is provided at a position in front of the quarter magnetic pole from the conductor portion 4a that contributes to the generated torque of the 'ftLIMM child coil 4-1. (See Figure 4).

By providing the screw 15-1.15-2 made of the magnetic material at the above-described position, the screw 15-1.15-2 is attracted to the center of the N pole sS4 of the field magnet 2 and is opposed to it. The field magnet is stopped. Therefore, since the magnetoelectric conversion element 5 always detects N+ffi or S& of the field magnet 2, that is, it does not detect the dead point (does not face the dead point), the armature coil 4-1 or By applying a current in a predetermined direction to 4-2, the rotor having the field magnet 2 can be rotated in a predetermined direction. Screw 1 made of magnetic material
Providing the screw 15-1.15-2 originally causes the occurrence of undesirable coking, but in this disk type brushless fan motor 1) M, the screw 15-1.15
-2's coking is effectively used to enable continuous rotation. Therefore, since only one position sensing element is required, an inexpensive disk-type brushless motor or disk-type brushless fan motor that is energized in one phase can be obtained.

It goes without saying that the screws 15-1, 1', 5-2 may be provided at the positions 16 and 17 surrounded by dotted lines, with reference to Figure 4. In addition, one or more screws 15 is generally sufficient for the purpose, and the number may be appropriately selected based on design specifications, and the above-mentioned positions may be arbitrarily selected.

FIG. 6 is a developed view of a field magnet 2 and a stator 4 in a brushless (fan) motor with 4 poles, 2 coils, and 1 phase reciprocating energization.

The container portions 4a, 4a that contribute to the generated torque of the electric and negative coils 4-1, 4-2 are arranged at equal intervals of 180 electrical degrees, respectively. The local terminal of the conductor portion 4a and the electric machine P coil 4- contribute to the generated torque of the armature coil 4-1.
One terminal of the conductor portion 4a that contributes to the generated torque of the armature coil 4-1 is commonly connected, and one terminal of the conductor portion 4a that contributes to the generated torque of the armature coil 4-1 is connected to the collector of the transistor 18 of the drive circuit IC 6 and the transistor. The other terminal of the conductor portion 4a, which is connected to the connection point 25 with the collector of the transistor 19 and contributes to the torque generated by the armature coil 4-2, is connected to the connection point 28 between the collector of the transistor 26 and the collector of the transistor 27. There is. , the drive circuit IC 6 is formed as a one-phase reciprocating energization control circuit. Transistor 18.
The emitters of transistors 19 and 26 are each connected to a positive power supply terminal 29, and the emitters of transistors 19 and 27 are each connected to ground 60. The output terminal 31-1 of the magnetoelectric conversion element 5 is connected to the transistor 1 constituting the drive circuit IC 6.
8.27, the output terminal 31-2 is connected to the base side of the transistor 19.26. Therefore, when the magnetoelectric conversion element 5 detects the N pole of the field magnet 2, (
(Situation shown in Figure 6).

Via the output terminal 31-1,!・Langister 18°27
conduction, a current in the direction of arrow B can be caused to flow through the armature fill 4-1, 4-2, and a rotational force in the direction of arrow A can be obtained. When the magnetoelectric conversion element 5 detects the S pole of the field magnet 2, it outputs the transistor 19.2 via the output terminal 61-2.
6 becomes conductive, a current in the opposite direction to the above flows through the coils 4-1 and 4-2, and a rotational force in the direction of arrow A can be obtained.

7 and 8 show a second embodiment of the present invention,
When a six-pole field magnet 2' is used as shown in FIG.
This shows that it is sufficient to arrange 1, 4'-2.

In this case, the armature coils 4'-1 and 4'-2 are formed so that the opening angles of the conductor portions 4'a and 4/a, which contribute to the generated torque, are 60 degrees. It should be noted that there are other positions where the screw 15 should be placed, such as the dotted line enclosure positions 32 and 33.

9 to 11 show a third embodiment of the present invention, in which an eight-pole field magnet 7 is used as shown in FIG. 2 armature coils 4'-
1,4"-2 are arranged on the 6th surface of the printed circuit board 180 symmetrically in the same way as above. Armature coil 4"-1,4"
-2 is a conductor portion 4'a that contributes to the generated torque in the radial direction.
It is formed in the shape of a fan frame with an opening angle of 45 degrees. The drive circuit IC6 connects the armature coils 4"-1 and 4.
The IC 6 for the drive circuit is integrally formed including the magnetoelectric conversion element 5 used as a position detection element, and its thickness is less than the thickness of the armature coil 4. Note that this drive circuit IC 6 has the magnetoelectric transducer 5 located at the same position as the conductor portion ea that contributes to the generated torque of the armature coil 4'-1 or 4'-2. It is provided at the IC position for the drive circuit so that it can be placed on the 6th surface of the printed circuit board outside the coil occupied position, and is formed in a size and thickness that allows it to be placed at the printed circuit board position L. The positions to be disposed will be explained using the developed view of the stator armature 1 consisting of the field magnet 2 and two armature coils 4'-1 and 4'-2 in Fig. 11. Referring to the diagram,
For example, as shown in FIG.
It is difficult to locate the part surrounded by the dotted line in 1. Also, armature fill 4'-1.

It is not possible to form the corresponding workpiece C6 with the conductor portion 4''a which contributes to the generated torque of 4'-2.

Therefore, in this example, if the desirable position for arranging the magnetoelectric transducer 5 is the dotted line enclosure position 34, the dotted line enclosure position 34 is located at the N of the field magnet 2'.
Since it corresponds to approximately the middle part of the pole 7e, when searching for a position corresponding to the position 64 and outside the position occupied by the armature coil, it faces the N poles 2'c and 2'g of the field magnet r. This corresponds to positions 35 and 36 surrounded by dotted lines. Therefore, the first
In FIG. 1, the drive circuit IC 6, which is formed so that the magnetoelectric transducer 5 can be disposed at the position 36 surrounded by dotted lines, is connected to the armature coil 4.
'-2 and 4''-1. Even if the magnetoelectric conversion element 5 is arranged at the dotted line enclosure position 35, the drive circuit IC♂ is connected to the armature coil r as shown by the dotted line. -1 and 4'
It can be arranged on the 6th side of the printed circuit board between 2 and 2. Note that even if the dotted line enclosure position 64' is used as a reference, the magnetoelectric transducer 5 can be arranged at the dotted line enclosure position 35 or 66 according to the above method. Furthermore, if the dotted line enclosure position 37.37', which is the position facing the conductor part 4'a that contributes to the other generated torque of the armature coil 4''-1, 4''-2, is taken as a reference, the position 67
.

67' faces the approximately middle part of the S poles 2''b, 2'f of the field magnet 2', so if you search for a similar position, you will find the approximately middle part of the S poles 2d, 2'h. Since the positions 38 and 39 of the dotted line enclosure opposite to correspond to the positions 38 and 39,
Even if the magnetoelectric conversion element 5 is located in the same manner as described above, the drive circuit ICs 6' and 6' including the element 5 can be provided. Returning to FIG. 10 again, the screw 15-1 made of a magnetic material.
The arrangement position of 15-2 will be explained. Screw 15-1.15-
2 are conductor parts 4'a to field magnets z that contribute to the generated torque of the armature coil 4'-1.
The magnetic pole width (11.25 degrees), which is approximately one-quarter of ', is provided at the front position.

In addition, such a position is also suitable for the pond as well as the dotted line enclosure position 40, 4.
1 is applicable, a screw may be provided at the position 40 and 41. Also, the screw 15-1.

Since the condition position equivalent to the position of 15-2 and the dotted line enclosures 40, 41 corresponds to the dotted line enclosure 2 42, .
At the positions 42, . . . , 45, screws made of a magnetic material that generate the coking may be provided. In addition, in FIG. 10, the drive circuit I
An example is shown in which the IC6 overlaps with C6, so if the IC6 is arranged as shown in FIG.
Needless to say, it is not appropriate to provide the above-mentioned screws.

As is clear from the above, the disc-type brushless motor of the present invention can (self-start even with one IHMiH sensing element), (2) has one position sensing water element, two armature coils, and two components. (3) There is no need to use a stator yoke, so if a stator yoke is not used, Since the output waveform of the position sensing element is smooth, this smooth output is used to switch the energization of the armature coil, so the rotor rotates smoothly, eliminating the harsh noise and large rotational noise that occurs with rotation as in conventional methods. Experiments have shown that a quiet disk-type brushless (fan) motor that does not emit any noise is installed. While
You can get a high-speed rotating disc-type brushless motor,
In addition, it has the advantage of requiring a much lower starting voltage than commercially available products, and (5) is a coreless type that is nearly perfect, eliminating the dead reference points mentioned above. (6) The two armature coils are always energized. By using an IC for the drive circuit of the state's party motion circuit (j. (7) A drive circuit IC is formed to be the same or smaller than the stator armature, and the stator By rationally arranging the coils in the armature between the two coils, the disc-type brushless (fan) motor with built-in drive circuit can be made extremely flat in the axial direction and compact. A disk-type brushless (fan) motor with tremendous effects such as the following can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a disk-type brushless fan motor to which a disk-type brushless motor according to one embodiment of the present invention is applied, and FIG. 2 is a perspective view of the case of the disk-type brushless fan motor shown in FIG. 1. , Fig. 3 is a perspective view of the fan-equipped cup body shown in Fig. 1, Fig. 4 is a plan view of the stake <IH2;
Bottom view of the 4-pole field magnet used in the case shown in Fig. 6.
The figure shows a developed view of the stator armature in Fig. 4 and the four-bottle field (Yo magnet) in Fig. 5, Fig. 7 is a plan view of a stator armature as another example of the present invention, and Fig. 8 shows a Fig. 7 is a bottom view of a 6-pole field magnet used for ringing, Fig. 9 is a bottom view of an 8-pole field magnet used in another embodiment, and 1
Figure 0 is a plan view of the stator armature in case i in Figure 9, and Figure 11 is a developed view of the field magnet in Figure 9 and the stator armature in Figure 10. 1... Stator type 1; ζ, 2. z', 2"...
・Field magnet, 4. 4', 4'... Zhs child coil, 5... Magnetoelectric force element (position detection element), 6.
・・Drive circuit IC115-1, 15-2・・Magnetic・1
A screw consisting of one piece. ';'frl-Outputting high school students, righteousness Teru■Yu Figure 9 Erase Q Father's Figure 8 Figure 1O

Claims (1)

[Claims] A 2p (1) is an integer of 2 or more) pole magnet rotor having 1, N, and S magnetic poles alternately, and a magnet rotor provided on the stator side facing the magnet rotor. The stator armature includes a stator armature consisting of two armature coils, one position sensing element, and a means for generating coking so that the magnet rotor can self-start. In the disk-type brushless fan motor, the means for generating coking is located at a position approximately one-fourth of the magnetic pole width in front of the conductor portion that contributes to the generated torque of the Denisogo coil in the direction of rotation of the magnetic rotor. A drive circuit which is provided to generate coking at a position under equal conditions to the position, is formed with or without the position detection element L, and is formed to have a thickness equal to or less than the height of one distribution armature coil. A disc-type brushless motor having one position detection element, characterized in that an IC for the L distribution armature coil is disposed outside the armature coil occupation position on the L distribution armature coil arrangement surface. The means for generating cogging as described in 2 is at a position approximately 1/4 magnetic pole width in front of the conductor portion that contributes to the generated torque of the armature coil in the direction of rotation of the magnet rotor, or under conditions equivalent to this position. 3. A disk type brushless motor having one position sensing element according to claim 2, characterized in that the position sensing element is formed by providing a projection made of a magnetic material at the position. 3. A disc type brushless brushless having one position sensing element according to claim 1 or claim 2, characterized in that no stator yoke is provided on the lower surface of the armature coil forming the L stator armature. motor. 4. One position sensing element according to any one of claims 1 to 3, wherein the screw made of one magnetic hole is for fixing the stator armature to a fixed example. Disc type brushless motor with.