JPS5812567A - Disc-shaped brushless motor - Google Patents

Abstract

PURPOSE:To obtain a motor having strong torque and less ripple without loss of flatness by displacing a plurality of frame-shaped armature coils from each other to planely arranging at upper and lower stages and arranging radially at two stages. CONSTITUTION:Frame-shaped armature coils 2' are arranged at upper and lower stages to dispose a flat field magnet 1 from above and below planely oppositely to the field magnet 1. In this case, the positions of the upper and lower stage frame-shaped armature coils 2' are displaced from each other. Further, armature coils 2'a, 2'b are displaced from each other radially at respective stages to become two stages. Position detectors 10 are arranged at the respective armature coils 2'. In this manner, even if a number of armature coils 2' are used, the respective coils are not superposed. Accordingly, the generated torque can be increased without loss of flatness. Further, torque ripple can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc-type brushless motor that allows the number of phases of the motor to be greatly increased to ensure smooth rotation of the motor.

Motors include AC motors and DC motors, rotary motors that rotate and linear motors that reciprocate in a straight line. Disk (axial gap,
It is well known that there are two types of rotary motors: commutator motors and brushless motors.

The present invention is a DC motor, a rotary motor, a disk type motor, and a brushless motor. It should be noted that the disk type of the present invention can bring out the effects of the present invention even more, whereas the cup type can bring out the intended effects of the present invention, which will become clear from the following explanation. First, the present invention is a disk type commutator motor.

2. Description of the Related Art A disc-type brushless motor in which a field magnet side is used as a rotor and an armature winding group is fixedly installed on a stationary side opposite to the field magnet is known in the art. Here, motors used in special fields such as imaging equipment are preferably disk-type from the viewpoint of shape, and from the viewpoint of performance they are required to have extremely high efficiency and special rotational drive, and in terms of life. Since it is used in very expensive equipment, it must have a long lifespan. Therefore, a disk type brushless motor is desired. This is because it can be made into a disk shape and does not use a commutator, so it can be expected to have a long life.

In order to achieve very high efficiency, a large number of armature windings must be provided. However, most conventional disc-type brushless motors are as shown in FIGS. 1 to 3. This conventionally common disc type brushless motor will be explained with reference to Figs. The opening angle width (180 degrees) is approximately the same as the magnetic pole width (180 degrees) of the two-pole field magnet-h (which is installed vertically on the rotating shaft), which has S and N poles spaced 180 degrees apart on the inner surface of the motor body.
13 bow-shaped armature windings 2 formed with 180 degree back winding
(See FIG. 1) The groups are arranged opposite to each other in the field magnet 1 in a superimposed manner as shown in FIG. In this way, the developed view of the armature winding 2 and the field magnet 1 when the armature winding 2 is arranged in a superimposed manner (l is as shown in Fig. 3). As is clear from FIG. 3, in the conventional disk-type brushless motor, the conductor portion A of the armature winding 2.

Since all the parts B and B' overlap many times, the thickness of the second group of armature windings becomes extremely thick, and as a result, the air gap between field magnet 1 and armature winding 2 becomes long. Strong torque cannot be obtained and high efficiency of the motor cannot be expected. -1"H +1. ′−.

2 overlaps - processing of the coil end is difficult, making it unsuitable for mass production, expensive, and extremely uneven
It is impossible to obtain a similar type brushless motor. In an attempt to solve this problem, the number of magnetic poles of the field magnet was increased to 4 magnetic poles, 6 magnetic poles, etc., and the number of magnetic poles was increased to 4 magnetic poles, 6 magnetic poles, etc., and the armature winding was 2, the winding opening angle is 180 degrees, and as the number of magnetic poles is increased, the winding opening angle width is narrowed, the number of armature windings is increased, and the disks are arranged at an equal pitch to avoid overlapping. Type motor cooling has recently appeared, and various designs have been developed based on its effectiveness in that it can be made into a flat disc type. However, compared to the conventional cup motor with a cylindrical core, its history is short and it has not yet reached the point where it can be said to be perfect.The disc-type cup motor must be further improved in the future. In particular, it can be said to be a brushless (semiconductor) motor. Now, S of the field magnet mentioned above,
Figures 1 to 3 show that this is a conventionally known data in which the number of N magnetic poles is increased, the number of armature windings wound around the magnetic pole width is increased, and the armature windings are not overlapped. This is clear when compared with the motor shown. However, in such a motor, even if the number of S and N magnetic poles of the field magnet is increased, as the number of armature windings increases, the armature windings will inevitably overlap. . for example,
FIGS. 4 and 5 show a cage that has a portion so that the armature winding 2 does not overlap as much as possible, or the number of overlapping portions is reduced. In other words, if the number of S and N magnetic poles of the field magnet is increased and the armature winding 2 is wound with a narrow opening angle width, the armature winding 2ff can be arranged so as not to overlap in the q direction. However, this is not possible when the armature has four magnetic poles and seven armature windings 2. In order to arrange the armature windings 2 of the above-mentioned figures 1 to 3 at equal pitches so that they do not overlap, the S and N poles should be arranged alternately at equal intervals of 20 mm, as shown in Figure 6. A flat donut-shaped field magnet 1 with 20 equally magnetized magnetic poles is formed, and an armature winding 2 is formed.
As shown in FIG. 7, it is necessary to arrange 13 pieces wound in a fan frame shape with approximately the same opening angle width as the magnetic pole width of the field magnet 1 at equal intervals and so as not to overlap each other. 4. Here, as mentioned above, the field magnet 1
When the number of armature windings 2 is set to 20 magnetic poles, if the number of armature windings 2 is further increased, the armature windings 2 naturally tend to overlap.

In order to prevent this from being superimposed, it is necessary to further increase the number of magnetic poles of the field magnet 1, and at the same time, it is necessary to increase the number of armature windings 2 with smaller opening angles.

As the number of these increases, the conditions become more severe and the benefits of the motor decrease. In particular, it is difficult for disc-type motors to be long in the vertical direction, but
In many devices, the length of the radius can be increased. Therefore, it is desirable to make the most of this permissible condition. However, without realizing this permissible condition, conventional research and development has only focused on applying cup-type motors and conventionally known disk-type motors, which are bound to a fixed concept. (2) However, it is desirable to increase the number of armature windings 2 to obtain a high torque and high efficiency disk type motor. Furthermore, we want a motor that can rotate smoothly with little torque ripple.

(3) However, in order to satisfy the conditions (1) and (2) above, it is not desirable to increase the number of magnetic poles of the field magnet 1. Considering the basic conditions (1) to (3) above, (4) Now, if the disc-type brushless motor is large, for example, as large as 40 centimeters in diameter, Forming a flat donut-shaped field magnet 1 with a diameter of 30 centimeters or more as shown in FIG. 6 is very complicated and expensive. In particular, large, special disk-type motors with a diameter of up to 40 centimeters are currently novel, so the places where they can be used are limited, and as a result, the number of units produced is also limited. Therefore, although it is possible to use the field magnet 1 shown in FIG. 6, it is necessary to take into consideration the possibility of using an inexpensive field magnet 1. That is, the sixth
In order to form a field magnet 1 with a diameter of 30 centimeters as shown in @, the cost for this mold would be close to 10 million yen, and when other elements are combined, the cost would be enormous. Become something. However, as mentioned above, the number of motors produced is limited. Therefore, as described above, it is necessary to somehow form the field magnet 1 which is inexpensive. (5) In the above case, a field magnet 1 with a diameter of up to 30 cm
When using the armature winding 2, which faces the armature winding 2 (this electric machine pre-winding a2 is wound in a frame shape with approximately the same opening angle width as the magnetic pole width of the field magnet 1). Each armature winding 2 in the group must also have a large frame shape, and if the conducting wire forming this is extremely thick, this will not cause much of a problem, but the frame may break due to external impact. The armature winding, which is wound in a shape, may become unraveled and damaged. Such a phenomenon damages the credibility of a device using an expensive motor. That is, although such a phenomenon should never occur, it cannot be said that such a phenomenon never occurs in the above case. In order to prevent such a situation from occurring, it is necessary to use self-fusing wire as the conducting wire forming the frame-shaped armature winding 2, or
The wire must be wound into a frame, then molded into plastic and solidified. However, implementing such a measure results in a motor having a very long lifespan, and has the disadvantage that the apparatus equipped with the expensive motor itself becomes expensive.

The disc type brushless motor of the present invention is as described above (1).
It was devised to take into account all the aspects of ~ (5)17, solve these points and generate a synergistic effect, and the above (
This was done in order to solve the disadvantages of 1) to (5) and to obtain an effect that will become clear from the explanation given later.

Hereinafter, the present invention will be explained in detail using the drawings from FIG. 8 onwards.

FIG. 8 is a longitudinal cross-sectional view of a disc type brushless motor M of the present invention as an embodiment of the present invention.
The main body is a rectangular yoke 3 made of a magnetic material such as a mild steel plate.
4 are opposed to each other with a gap between them, and the four corners are supported by pillars 5. The rotating shaft 6 is perpendicular to the center of the brushless motor M formed in this way and rotatably supported by a bearing 7°8.A magnetic material is placed between the yokes 3 and 4 of the rotating shaft 6. A disc-shaped yoke 9 is vertically arranged, and this yoke 9 rotates together with the rotating shaft 6.

On both sides of the yoke 9, an annular field magnet 1 as shown in FIG. On the surface of No. 4 facing the field magnet 1), a conducting wire (fan) is connected with an opening angle width that is approximately the same as the magnetic pole width of the field magnet 1.
An armature winding 21 formed by winding a large number of turns in a frame shape is arranged in two or more stages in the radial direction. In addition, in the case of the one shown in FIG. 8, they are arranged in two stages in the radial direction.

Furthermore, if the field magnet 1 shown in Fig. 6 is used, and the disc-type brushless motor M is as large as 40 centimeters in diameter, the mold cost alone will cost more than 10 million yen. This is very expensive and inconvenient. In particular, the disc-type brushless motor M of the present invention is currently being used in special fields, such as very expensive imaging equipment and medical equipment such as respirators and heart-lung machines that can affect human life. When used, the number of mass-produced motors is small compared to general motors. Therefore, the field magnet 1 must not be expensive. Therefore, in solving this problem, it is convenient to form the magnetic poles forming the S magnetic pole and N magnetic pole shown in FIG. 6 using the field mug pot segments IA and IB. Assuming that the field magnet 1 has 20 magnetic poles, 20 sector-shaped field magnet segments are required, which are divided into 20 equal parts as shown in FIG. However, it is also cumbersome to form the fan frame-shaped field magnet segments that form the field magnet 1 with a diameter of up to 30 centimeters, and like the field magnet 1 described above, it becomes expensive. Therefore, such a fan frame-shaped field magnet segment is replaced with a smaller, square-shaped, inexpensive field magnet segment IA.

1B as shown in FIG. 9. In addition, in Figure 9, all field magnets are included in the drawing.
, not drawing IB. As shown in FIG. 9, two (or three or more) field magnet segments A are arranged in the radial direction so as to satisfy the magnetic pole width.

If the field magnet 1 is formed by firmly adhering IB to the surface of the yoke 9, the field magnet 1 can be formed at low cost, and ultimately the field magnet segments (IA, IB) are formed. It is not necessary to use the same quality.Due to the nature of a rotating motor that requires particularly strong torque in the outer circumferential direction, field magnet segments with stronger magnetic force in the outer circumferential direction are used, for example, as field magnet segments IA. A more synergistic effect can be obtained by using rare earth magnets with weaker magnetic force toward the inner circumference, for example, using inexpensive black ferrite magnets. In addition, in FIG. 9, segment A
, IB are placed in contact with each other, but the parts 2'B and 2'B' that do not contribute to the generated torque of the armature winding 21 are segments) and do not have to face IA and IB. ,
(Essentially segment) IA and IB can be made even smaller, which makes it even better. However, for convenience of the drawing and text created in FIG. 8, the field magnet 1 shown in FIG. 6 is used in the disk type brushless motor M of the present invention. On the surface of the yoke 7.8 facing the field magnet 1, there are provided two steps (although three or more steps may be provided) in the radial direction on the same surface.
Thirteen frame-shaped armature windings 2'a and 2'b are wound in the circumferential direction, each having an opening angle width that is approximately the same as the magnetic pole width of the magnet 1 (that is, it is sufficient to satisfy the same conditions). (See Figure 10). As is clear from FIG. 10, the core armature winding 2/b in the inner circumferential direction is shifted by degrees. Also, as is clear from Fig. 10, the armature windings 2'a, 2
'b are arranged so that they do not overlap each other in the radial direction or the circumferential direction, so the air gap between the yoke 9 and the field magnet 1 can be shortened, so strong torque can be obtained. , a highly efficient disc-type brushless motor M is obtained. Also, armature windings 2'a, 2'
b are arranged so as not to overlap with each other, so that they are disk-shaped and extremely flat in the axial direction. In addition, if the armature windings 2'a and 2'b are arranged over two stages, the E stage and the lower stage, there is a probability that they will overlap even if the number of the electric machine'r-a wires 2 becomes very large. becomes extremely small. Furthermore, with this arrangement, there are 13 windings 2'a and 2'b each in the circumferential direction, resulting in a disc-type brushless motor M with 26 phases, which is twice as many. Winding 2'a on both sides,
2'b similarly has a 46-phase motor M
becomes.

In other words, compared to a conventional disk type motor, it is possible to create a motor M with twice, three times, etc. the number of phases, so it is possible to obtain a high-performance motor M (j) with less torque ripple. Armature windings wound in the shape of a fan frame have low strength, whereas armature windings wound in the shape of a small fan frame are stronger. Position sensing elements such as Hall elements are arranged within the frame cavities of the respective windings 2'a, 2'b. Essentially, the element 10 is arranged in the frame cavity of the respective windings 2'a, 2'b.

The element 10-i is placed at the position of the conductor that contributes to the generated torque, but if the element 10-i is placed at this position, the
The air gap between the windings and the field magnet must be lengthened, which reduces the torque accordingly, and the thickness of the motor must also be increased, which is inconvenient.

Therefore, the element 10 is disposed in the hollow part within the frame of the windings 2'a and 2'b, which is a position that meets the same conditions as the conductor part contributing to the generated torque. FIG. 11 shows a developed view of the field magnet (formed by IA and IB) shown in FIG. 9 and the armature windings 2'a and 2'b shown in FIG. Referring to FIG. 11, the - terminals of the armature windings 2'a and 2'b are commonly connected inside the motor M, and the other terminals are respectively connected to the semiconductor rectifier 11. In the present invention, the reason for this connection will be described later.The semiconductor rectifier 11 is connected to the positive power terminal 12-1 and the negative power terminal 12-2.The semiconductor rectifier 11 is For example, 13 groups of semiconductor rectifiers (windings 12'a and 12/b) shown in FIG.
(the same number of pieces). 'This semiconductor rectifier 13
To explain, the position sensing element 1O-3 (this element 10 is shown in FIG. 11 as the L1 winding 2 for the sake of understanding)
'a, 2! For example, a Hall element with four terminals is used, and the wire is placed at the midpoint between two resistors R1 and R3. This element 10 is a detection element for detecting the N pole and S pole of the field magnet 1 to pass current in an appropriate direction to the armature windings 2'a and 2'b. As is clear from FIG. 11, this element 10-3 faces the S pole of the field magnet segment IA, that is, since the S pole is detected, this element 10-3
The output waveform from -3 appears as shown in FIG. 13(a). Terminal 14a of element 10-3.

14b is connected to the inverting amplifier circuit 15. This inverting amplifier circuit 15 amplifies the output voltage from the element 10-3, and the output waveform from the circuit 15 appears as shown in FIG. 13(b). The signal amplified by the circuit 15 is input to the current amplification circuit 17, and the output waveform from the circuit 17 appears as shown in FIG. 13(c). Since the element 10-3 detects the S pole, the output of the element 10-3 is voltage amplified by the operational amplifier 16 via the resistor R3, and the transistor Tr4 is turned on via the resistor R6. At this time, the transistor Trt pTrs is turned on. ), transistor Tr2 is also turned on, so armature winding 2/a-3 has arrow A.
Current flows in the direction. When the element 10-3 detects the N pole, the output of the element 10-3 flows through the resistor R1 to the operational amplifier 16 and is voltage amplified, and this voltage amplified output turns on the transistor Trs through the resistor R1. Therefore, since the transistor Tr1 is also turned on (transistors Tr, , 'l'r4 are on), current flows in the armature winding 2'a-3 in the four directions opposite to the arrows.

Note that the same applies to the other armature windings 2'a and 2'b, so a description thereof will be omitted. Also, in FIG. 11, element 1'0
-2.10-13, 10-17, 10-19 and 1
Since 0-21 detects the boundary between S and N poles, no output is output from the element, so armature windings 2'a-2, 2
'a-13, 2'b-1, 2'b-3 and 2'b-5
No current flows through.

Now, the reason why the negative terminals of the armature windings 2'a and 2To are commonly connected and the other terminals are connected to the semiconductor rectifier 11 (13) will be described below. The connection method of the present invention is more effective as the number of armature windings increases, and the number of armature windings 2'a and 2'b disposed in the circumferential direction However, if there are only 2 to 5 of them, they cannot fulfill their important functions.
When the number is seven or more, the windings can be energized efficiently, so that an efficient disk-type brushless motor M with increased starting torque can be obtained.

Conventionally, a commutator motor having seven or more armature windings 2 is shown in FIG. 14. This shows a single-port, single-layer winding in which the iron core goes around once to form a closed circuit.

In FIG. 14, reference numeral 18 indicates a commutator, and 19 indicates a brush. In addition to the single-hole single-type winding, a single-hole type winding and a composite two-type winding are also known. Now, this figure 14,
In this case, there are seven electric prewinding #I2 arranged as shown in Fig. 15, and as shown in Fig. 16, there are 10 poles with S poles and N poles alternately magnetized at equal intervals. Taking the case where the field magnet 1 is used as an example and replacing it with a brushless motor, the result will be as shown in FIG. 17. Each armature winding 2
-1. ...2-7, a semiconductor rectifier 13 is connected to a connection point between the windings. Winding group 2-1 arranged in this way. ....

If a current is applied in the direction appropriate for 2-7, the rotor will rotate according to Fleming's left-hand rule. Winding group 2-1. . . , 2-7, the above-mentioned semiconductor rectifier 13 is a detection device for flowing a suitable current. Now, the position detection elements 10 of the semiconductor rectifiers 13-1, 13-2 and 13-3 (note that they are not drawn in FIG. 17)
Assuming that Tr is detecting the N pole, the transistor Tr is turned on. Also devices 13-4, 13-5, 13-6
Assuming that the position detection element 10 of 13-7 is detecting the S pole, the transistor Ifr is turned on. Therefore, it appears that the current in windings #2-1, 2-2 and 2-3 flows to windings 2-4, 2-5, 2-6 and 2-7. However, in a motor using the winding method as shown in FIG. 17, the connection point 20-1. ..., 20-3
are at the same potential, so if a back electromotive force is generated,
The winding 2-1 is short-circuited. ..., no current flows through 2-3. Also, connection point 20-5 and 20-6 are connection points 20-5 and 20-6.
-4.Since it has the same potential as 20-7, the volume is #! 2-5.2-6
No current flows through.

That is, according to the connection method □ method as shown in Fig. 17, connection point 2
Current flows through only two windings 2-1, 2-4 between different potentials: 0-1 and 20-7, and 20-3 and 20-4. That is, a total of seven windings 2-1. ....

Since 5 windings out of 2-7 are not used, sufficient torque cannot be generated. Therefore, if the number of windings 2 is further increased in order to generate sufficient torque, the number of windings that are not energized increases accordingly. In order to eliminate these drawbacks, the only way to overcome conventional methods and concepts was to use a very complicated wiring method. Therefore, one of the inventors of the present invention first performed the wiring method shown in FIG. This wiring method may seem simple once you reveal the details of the 'Columbus' egg 1', but in the motor field, this kind of idea was not only something that had never been seen before, but also in products. . Therefore, a more efficient motor could not be obtained. This wiring method is
Disc type brushless motor M is a disc type motor and is also a brushless motor, and is also highly efficient.
It is said that this is effective when the armature winding 2 has seven or more windings in the circumferential direction in order to obtain this. However, in the past, it has not been possible to conceive of the wiring methods shown in FIGS. 11 and 18. Referring to FIG. 18, if the wiring method explained in FIG. 18 is applied to the present invention,
It will be understood that the present invention is extremely novel and highly inventive.

Referring to FIG. 18, armature winding 2-1.
. . , 2-7 are the same as shown in FIG. 15. The field magnet 1 shown in FIG. 16 is also used. The one in FIG. 18 includes armature winding 2-1. ..., 2-7 - terminal 2-1', ・
. . , 2-7' are commonly connected inside the motor M, and other terminals 2-1", . . . , 2-7' are connected to the semiconductor rectifier 13-1. . ....

13-7, it is provided outside the motor, but in any case, this rectifying device 13-1. ..., 13-7 are connected to respective terminals. In addition, Fig. 19 shows the field magnet 1 of Fig. 18.
and a developed view of the armature winding 2.

In FIG. 19, position sensing elements 10-1.・・・
・.

10-7 to armature coil 2-1. . . , shows the case where it is placed on the conductor portion that contributes to the generated torque of 2-7.

As is clear from FIG. 19, since the element 10-5 is positioned opposite to the boundary line between the S and N poles, the element 10-5
No output is generated from 0-5 and therefore armature winding 2-
5 is not energized. However, element 1()-1,...
, 10-4, 10-6, and 10-7 are N poles, respectively.

Since it faces the S pole and detects the magnetic pole, the electric machine pre-winding @2-1. ..., 2-4, 2-6, 2-7 as shown in FIG. 19. For example, the device 13-1 (
In the device 13-2, the element 10-1 faces the north pole, so the transistor Trl is turned on, and in the device 13-2, the element 10-2 faces the south pole, so the transistor Trl is turned on. Tr2 is turned on, therefore, terminal 2
-1', armature winding 2-1. Terminal 2-1'.

Current flows through the connection point 21 and the terminal 2-21, and so on.

Therefore, according to the wiring method shown in FIGS. 18 and 19,
Six of the seven armature windings 2 are energized, and the armature windings 2 can be effectively used. As described above, according to the wiring method shown in FIG. 17, only two of the seven armature windings 2 can be effectively used. Armature winding 2 is field magnet 1
It is clear that the number of unused armature windings 2 also doubles if the armature windings 2 are provided on both sides. Also, armature winding 2
The greater the number of armature windings 2
Although the number of armature windings 2 increases, even if there is an armature winding 2 that is not energized, the time is short and the armature winding 2 becomes energized soon after that. 2 can be used effectively, and a motor M that can generate strong torque and is extremely efficient can be obtained.

Also, the number of armature windings 2 on one side is 7.9°11,
...and an odd number, each side has 7
The motor M is a phase, 9-phase, 11-phase, etc. motor with good characteristics.

Therefore, in the present invention as well, the wiring method shown in FIGS. 18 and 19 is adopted in FIG. 11, which is an embodiment of the present invention, as described above. In addition, Fig. 20 shows the armature winding 2/ in the circumferential direction.

It is a development view showing an example of the present invention having seven or more.

As is clear from this Figure 20, Figures 18 and 19
Compared to the one shown, the number of energized armature windings 2' is further doubled. Therefore, the motor M can have double the number of phases, and torque ripple can be extremely reduced. Incidentally, since the wiring connection method shown in FIG. 20 has already been made clear from the above explanation, the explanation thereof will be omitted.

Since the present invention is established with a configuration that is clear from the above explanation, it is possible to arrange a large number of armature windings, and it can be made into a multi-phase motor, so strong torque can be obtained, efficiency is high, and torque ripples can be reduced. This is a disc-type brushless motor that provides smooth rotation with extremely little friction. Therefore, it is suitable for special equipment that requires high performance, such as imaging equipment and medical equipment, and since it is brushless, it has a long life that is commensurate with its high cost. Further, even if the number of armature windings is increased, there is almost no possibility that the armature windings overlap each other, and there is an effect that a brushless motor having a flat disk shape in the axial direction can be obtained.

[Brief explanation of the drawing]

Figure 1 is a plan view of the bow frame-shaped armature coil, Figure 2 is the
Fig. 3 is a developed view of the armature winding and field magnet in the case of Fig. 2, and Fig. 4 is a plan view of the arrangement using the armature winding shown in Fig. 2. FIG. 5 is a developed view of the armature winding and field magnet in the case of FIG. 4, FIG. 6 is a plan view of a 20-pole field magnet, Figure 7 shows 1 in the circumferential direction.
FIG. 8 is a plan view of three armature windings arranged without overlapping each other, FIG. 8 is a vertical cross-sectional view of a disc-type brushless motor as an embodiment of the present invention, and FIG. FIG. 6 is an explanatory diagram for forming a field magnet, FIG. 10 is a plan view showing the arrangement of armature windings showing an embodiment of the present invention, and FIG. 12 is an explanatory diagram of a semiconductor rectifier as an example, and FIG. 13 is an output waveform output from each component block of the semiconductor rectifier shown in FIG. 12. FIG. 14 is an explanatory diagram showing the principle structure of a known commutator motor having seven or more armature windings in the circumferential direction, and FIG. Fig. 16 is a plan view of a 10-pole field magnet, Fig. 17 is an explanatory diagram of the principle configuration when the commutator motor in Fig. 14 is replaced with a brushless motor, and Fig. 18 is a plan view of the present invention. FIG. 19 is a developed view of the armature winding and field magnet in FIG. 18, and FIG. 20 is an illustration of another embodiment of the present invention. FIG. 3 is a developed view of an armature winding and a field magnet (segment) showing an example.

Claims (1)

[Claims] A field magnet with 2 m (m is a positive integer of 1 or more) magnetic poles that is alternately magnetized with 1, N, and S is set as the rotating side, and the opening angle is approximately the same as the magnetic pole width of the field magnet. A frame-shaped armature winding formed with a width of
In addition, two or more stages in the radial direction are arranged in a plane on the fixed side, and the upper and lower armature windings are shifted in position and arranged in a plane on the fixed side, and a field magnet is arranged on the fixed side. A disc-type brushless motor characterized by being equipped with a position detection element group that detects the magnetic poles of the motor. 2. The armature windings of the upper and lower stages, which are disposed in a plane on the fixed side in two or more stages in the radial direction, are arranged so as not to overlap each other. Disc type brushless motor. 3. Claims 1 or 2, characterized in that two or more armature windings in the circumferential direction are arranged in a plane on the fixed side at equal intervals so as not to overlap each other in the circumferential direction.
Disc type brushless motor as described in section. 4. The disc type brushless motor according to any one of claims 1 to 3, wherein one position detection element is provided for each electric machine prewinding unit 1fQ. 5. The field magnet is fixedly fixed on both sides of a disc-shaped magnetic yoke that is perpendicular to a rotating shaft that is rotatably supported, and the armature winding group is provided on both sides of the yoke. 5. The disk-type brushless motor according to claim 1, wherein the motor is provided on a stationary side facing each of the field magnets. 6. Claims 1 to 5, characterized in that the armature winding has seven or more in the circumferential direction, and the - terminals of the armature winding are commonly connected. The disc type brushless motor described in any of the above. 7. The disc-type brushless motor according to claim 6, wherein the negative terminals of the armature windings in the radial direction are connected in common. 8. The disk type brushless motor according to claim 6, wherein the other terminals of the armature winding are each connected to a semiconductor rectifier.