JP2022076731A - Rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of reducing the number of main pole slots while maintaining an output in a state where an auxiliary pole is applied to a fraction slot winding structure.
SOLUTION: A stator 10 and a rotor 20 facing the stator 10 are provided. The rotor 20 includes a plurality of permanent magnets 122 arranged along the circumference of the rotor core 120. The stator 10 includes a plurality of teeth extending from the tubular stator yoke 114 toward the rotor 20, and a plurality of slots 104 formed between the plurality of teeth. In the teeth, the main pole teeth 116 around which the coil is wound and the auxiliary pole teeth 118 without the coil are alternately arranged in the circumferential direction. In the rotary electric machine 100, the greatest common divisor of the number of poles P, which is the total number S of the slots 104 and the total number of permanent magnets 122, is G, and the number of adjacent continuous coils X, which is S / M / G with respect to the number of phases M, is 1. Yes, all coils are configured to be wound in the same direction.
[Selection diagram] Fig. 3

Description

The present invention relates to a rotary electric machine.

As a background technique in this technical field, for example, there is Patent Document 1. This Patent Document 1 is composed of a rotor in which a plurality of pairs of permanent magnet poles in the circumferential direction are arranged on the outer circumference, a leg portion protruding toward the inner diameter side on the inner circumference, and a claw portion at the protruding tip of the leg portion. A brushless motor composed of stators in which a plurality of teeth are arranged in the circumferential direction is described. The teeth of this brushless motor are composed of a main pole tooth in which a coil is wound and a auxiliary pole tooth in which the coil is not wound, and the legs of the main pole tooth are configured so that the iron loss is lower than that of the auxiliary pole tooth. I try to do it.

With such a configuration, "when coils are wound around all the teeth in the circumferential direction, the coils wound around different teeth are arranged adjacent to each other in one slot, and these coils are arranged. Considering the insulation between each other and the winding work of the windings, the space factor of the windings in the slot has to be reduced, and the configuration as it is to form a brushless motor with high output and high torque. Then there is a problem "is described to be solved.

Japanese Unexamined Patent Publication No. 2006-340511

Motors that require low speed and large torque often have a large turning radius. When a more compact size is required, it is easy to select a centralized winding because the motor suppresses the increase in the coil end portion and makes it thinner. Further, in order to increase the winding coefficient of the centralized winding motor and reduce the cogging torque, a fractional slot winding structure is adopted in which the number of slots Q for each pole is 0.5 or less.

The fractional slot winding structure of a centralized winding motor tends to have a larger torque than a general combination structure in which the ratio of the number of slots to the number of poles is 3: 2, but the number of slots is larger than the number of poles. The problem is the increase in manufacturing manpower in proportion to the number of coils.

When an attempt is made to solve such a problem with a configuration as described in Patent Document 1, the following problems arise with respect to a motor having a specific fractional slot winding structure.

For example, FIG. 4 is a cross-sectional view of a general 3-phase 6-slot 8-pole motor cut in a direction orthogonal to the axial direction. The alphabets and symbols in FIG. 4 indicate each phase (U phase, V phase, W phase) and the winding direction of the winding, the adjacent teeth 401 are all out of phase, and the armature winding 402 are all in the same direction. It is rolled up. Eight permanent magnets 403 are arranged on the rotor. In the configuration shown in FIG. 4, as described in Patent Document 1, any of the adjacent windings having the same phase cannot be arranged alternately with any of the adjacent windings as auxiliary poles.

Further, FIG. 5 is a cross-sectional view of a general 3-phase 9-slot 8-pole motor cut in a direction orthogonal to the axial direction. As shown in FIG. 5, the windings of each phase (U phase, V phase, W phase) are adjacent to each other and are continuous to three teeth 401a, 401b, 401c. In the configuration shown in FIG. 5, as described in Patent Document 1, when the main pole and the auxiliary pole are alternately arranged in the same phase, two auxiliary poles are continuous in the circumferential direction, so that the auxiliary pole of a certain phase is used. , Wasted space is generated between the complement pole of another phase.

An object of the present invention is to provide a rotary electric machine capable of reducing the total number of main pole teeth while maintaining the output in a state where the auxiliary pole is applied to the fraction slot winding structure.

In order to achieve the above object, the present invention relates to a rotary electric machine including a stator and a rotor facing the stator, wherein the rotor has a tubular rotor core and the circumference of the rotor core. The stator is composed of a plurality of permanent magnets arranged alternately along the same direction, and the stator includes a tubular stator yoke, a plurality of teeth extending from the stator yoke toward the rotor, and the plurality of teeth. A plurality of slots formed between the teeth, the main pole teeth around which the coil is wound, and the auxiliary pole teeth without the coil are alternately arranged in the circumferential direction, and the total number S of the slots and the said The maximum commitment number of the number of poles P, which is the total number of permanent magnets, is G, the number of adjacent continuous coils X which is S / M / G with respect to the number of phases M is 1, and all the coils are wound in the same direction. It is characterized by being done.

Further, according to the present invention, in a rotary electric machine including a stator and a rotor facing the stator, the rotor alternates between a tubular rotor core and the circumference of the rotor core. It is composed of a plurality of permanent magnets arranged in an orientation, and the stator is formed between the tubular stator yoke, a plurality of teeth extending from the stator yoke toward the rotor, and the plurality of teeth. In the teeth, the main pole teeth around which the coil is wound and the auxiliary pole teeth without the coil are alternately arranged in the circumferential direction, and the total number S of the slots and the total number of the permanent magnets are used. When the maximum promise number of a certain number of poles P is G and the number of adjacent continuous coils X which is S / M / G with respect to the number of phases M is an odd number and a prime number larger than 1, the total number S of the slots is the adjacent number S. N divided by the number of continuous coils X is the total number of the main pole teeth (N = S / X), and all the coils are wound in the same direction.

According to the present invention, it is possible to provide a rotary electric machine capable of reducing the total number of main pole teeth while maintaining the output in a state where the auxiliary pole is applied to the fraction slot winding structure.

It is an overall block diagram of the rotary electric machine (motor) which concerns on Example 1 of this invention. It is a figure which shows the structure of the inside of a stator case 5 in FIG. It is sectional drawing which cut the stator and the rotor which concerns on Example 1 of this invention in the direction orthogonal to the rotation axis direction. It is sectional drawing which cut the general 3-phase 6-slot 8-pole motor in the direction orthogonal to the axial direction. It is sectional drawing which cut the general 3-phase 9-slot 8-pole motor in the direction orthogonal to the axial direction. It is a figure which compared the magnetomotive force distribution of the motor of Example 1 and the motor of 9 slots 8 poles. It is an overall block diagram of the rotary electric machine (motor) which concerns on Example 2 of this invention. It is a figure which shows the structure of the inside of a rotor case 6 in FIG.

Hereinafter, examples of the present invention will be described with reference to the accompanying drawings. Similar components are designated by the same reference numerals, and the same description is not repeated.

The various components of the present invention do not necessarily have to be independent of each other, one component is composed of a plurality of members, a plurality of components are composed of one member, and a certain component is different. It is permissible to be a part of a component of the above, to overlap a part of one component with a part of another component, and the like.

FIG. 1 is an overall configuration diagram of a rotary electric machine (motor) according to a first embodiment of the present invention. FIG. 1 is a cross-sectional view taken along the rotation axis direction of the rotary electric machine. The rotary electric machine of the first embodiment is a configuration example of a three-phase AC motor having three coils and eight permanent magnets.

As shown in FIG. 1, the rotary electric machine 100 includes a stator 10, a rotor 20 rotatably supported inward in the radial direction of the stator 10, a rotary shaft 4 fixed to the rotor 20, and a stator. It is composed of a stator case 5 that covers the rotor 10 and the rotor 20. The rotor 20 is arranged so as to face the stator 10 with a gap 102 (gap). The stator 10 includes an armature winding 112 wound around a main pole tooth, which will be described later. The rotor 20 includes a permanent magnet 122 attached to a rotor core, which will be described later.

FIG. 2 is a diagram showing the configuration inside the stator case 5 in FIG. 1. FIG. 2 is a cross-sectional view of a rotary electric machine cut in a direction orthogonal to the rotation axis direction.

In FIG. 2, the rotor 20 rotates about a rotation shaft 4. In the following description, unless otherwise specified, the terms "inner peripheral side" and "outer peripheral side" mean sides closer to and farther from the center of the rotation axis, respectively. Further, the description "diametrical direction" means a linear direction perpendicular to the rotation axis 4, and the description "circumferential direction" means the rotation direction of the rotation axis 4.

As shown in FIG. 2, the rotor 20 is composed of a rotor core 120 made of a magnetic material and a rotating shaft 4 that penetrates the rotor core 120 and rotates together with the rotor core 120. Further, the rotor 20 includes a plurality of (8 in FIG. 2) permanent magnets 122. Each permanent magnet 122 is attached to the surface of the rotor core 120, and the magnetization centers are alternately opposed to the gap 102 to form the magnetic poles of the north pole and the south pole. In the first embodiment, the permanent magnet 122 is attached so as to fit in the groove on the outer peripheral side of the rotor core 120, but the present invention does not limit the method of forming the magnetic pole by arranging the permanent magnet. For example, a magnet insertion hole may be provided inside the rotor core 120, and a permanent magnet may be fitted into the magnet insertion hole to form a magnetic pole.

The stator 10 includes a stator core 110 made of a magnetic material. The stator core 110 is composed of a cylindrical stator yoke 114, a plurality of main pole teeth 116 located on the inner peripheral side of the stator yoke 114 and facing the rotor 20, and a plurality of auxiliary pole teeth 118. To. The main pole teeth 116 and the auxiliary pole teeth 118 are alternately arranged along the circumferential direction of the stator yoke 114. A plurality of slots 104 are formed between the plurality of teeth (main pole teeth 116, auxiliary pole teeth 118).

The armature winding 112 forms a coil having an arbitrary shape and is wound around the main pole teeth 116. The armature winding 112 is not wound around the auxiliary pole teeth 118. The conductor 112A and the conductor 112B are arranged in the space (slot 104) between the adjacent main pole teeth 116 and the auxiliary pole teeth 118. The conductor 112A and 112B are part of the armature winding 112. For the armature winding 112, for example, a copper wire obtained by coating an electric conductor containing copper as a main component with an insulating film (for example, enamel, empla, etc.) is used. The conductor 112A and the conductor 112B are composed of one or more copper wires, and are energized in opposite directions in the rotation axis direction when the rotary electric machine 100 is driven. In the first embodiment, in order to strengthen the insulation, inclusions (for example, a tape made of a noncombustible material or a resin bobbin) are configured to be sandwiched between the armature winding 112 and the main electrode teeth 116. May be good. Further, the armature winding 112 may be fixed to the main electrode teeth 116 by impregnating the stator 10 with varnish, resin or the like. In the first embodiment, the number of main pole teeth 116 is three and the number of auxiliary pole teeth 118 is three. The main pole teeth 116 and the auxiliary pole teeth 118 are alternately arranged in the circumferential direction of the stator yoke 114, and the armature windings 112 wound around the main pole teeth 116 are all wound in the same direction.

The magnet material of the permanent magnet 122 may be any of ferrite type, neodymium type, samarium cobalt type and the like. Further, the permanent magnet 122 of the first embodiment has a tile shape in the cross section of FIG. 2, but is not limited to this and may have a flat plate shape. Further, the permanent magnet per magnetic pole may be divided into a plurality of pieces in the radial direction or the circumferential direction.

As the magnetic material constituting the rotor core 120, a laminated body in which a magnetic steel plate and an electrical insulator are laminated is applied in order to reduce the eddy current loss generated in the rotor core 120. A solid (bulk) magnetic material may be used in order to reduce material costs and processing costs. The rotor core 120 is fixed to the rotating shaft 4 by means such as adhesion, welding, press fitting, and shrink fitting.

As the magnetic material constituting the stator core 110, a laminated body in which a magnetic steel plate and an electric insulator are laminated is applied in order to reduce the eddy current loss generated in the stator core 110. A solid (bulk) magnetic material may be used in order to reduce material costs and processing costs.

FIG. 3 is a cross-sectional view of the stator and rotor according to the first embodiment of the present invention cut in a direction orthogonal to the rotation axis direction. As shown in FIG. 3, the number of copper wires constituting the conductor 112A and the conductor 112B adjacent to the main pole teeth 116 is determined according to the number of turns of the armature winding 112.

When a three-phase alternating current is applied to the armature winding 112, a magnetic field generated by the excitation of the adjacent conductors 112A and 112B acts on the main pole teeth 116U around which the U-phase armature winding 112 is wound. Then, a magnetic path 108U indicated by a broken line arrow is formed in the main pole teeth 116U. Similarly, the magnetic path 108V indicated by the broken line arrow is formed in the main pole teeth 116V, and the magnetic path 108W indicated by the broken line arrow is formed in the main pole teeth 116W.

In FIG. 3, when the number of turns of the armature winding 112 is once for each main pole teeth 116, the number of copper wires constituting the conductor 112A and the conductor 112B is one each. When a three-phase alternating current with an ampere-turn of 1 A (ampere-turn) is energized and the U phase peaks, the magnetomotive force of the magnetic path in the U-phase main pole teeth 116U is 2AT (2AT) because there are two conductors of the same phase around it. It becomes the magnetomotive force of ampere-turn).

Further, the magnetic field generated by the excitation of the U-phase conductor 112B also acts on the auxiliary pole teeth 118 adjacent to the main pole teeth 116U, and in the auxiliary pole teeth 118, the magnetomotive force is 1AT (= 2/2). ..

On the other hand, the magnetomotive force in the auxiliary pole teeth 118 is 0.5AT (= 1/2) due to the influence of the magnetic path 108V or the magnetic path 108W generated by the conductor 112B to which the current of the different phase (V phase or W phase) is energized. The magnetic force acts in the opposite direction. After all, the magnetic path 108U derived from the U phase and the magnetic path 108V or the magnetic path 108W derived from the different phase are opposite to each other, so that the magnetomotive force of the auxiliary pole teeth 118UV and 118WU is 0.5AT (1-0.5). Become. Therefore, the magnetomotive force of the auxiliary pole teeth 118UV and 118WU is one-fourth of the magnetomotive force of the main pole teeth.

At the same time, the magnetomotive force of the complementary pole teeth 118 (118VW) between the V phase and the W phase strengthens each other to become 1AT (0.5 + 0.5), which is half the magnetomotive force of the main pole teeth of the U phase. Will be.

As in the first embodiment, by winding all the coils in the same direction in the 6-slot 8-pole motor, magnetic saturation is less likely to occur inside the auxiliary pole teeth 118, so that the circumference of the auxiliary pole teeth 118 is reduced. The directional width can be narrower than the circumferential width of the main pole teeth 116, and the slot 104 in which the armature winding 112 is inserted can be expanded to increase the magnetomotive force of the main pole teeth.

When the winding direction of the armature winding of the main pole teeth other than the U phase is changed in the opposite direction, when the magnetomotive force of the main pole teeth of the U phase is also 2AT, the magnetomotive force of the adjacent auxiliary pole teeth is , Since the magnetomotive forces of the same phase and the different phase are matched in the direction of strengthening each other, it becomes 1.5AT (= 1 + 0.5). This is three-quarters of the main pole teeth. Therefore, the effect of expanding the slot 104 is smaller than that of the configuration of the first embodiment. Further, the magnetomotive force of the auxiliary pole teeth 118VW between the V phase and the W phase acts in a direction of strengthening each other in substantially the same manner, but there is a drawback that the torque is reduced because the directions of the magnetic paths are opposite to each other.

In order to configure the rotary electric machine 100 of the first embodiment, it is a condition that the number of adjacent continuous coils X is 1, and all the coils are wound in the same direction. The number of adjacent continuous coils X can be expressed by the following equation.

X = S / M / G
(S: total number of slots, M: number of phases, P: number of poles, G: greatest common divisor of S and P)
In the rotary electric machine 100 of the first embodiment, the maximum common divisor of the total number of slots S and the total number of permanent magnets P is G, and the number of phases M (in the first embodiment, U phase, V phase, and W phase). The number X of adjacent continuous coils that are S / M / G is 1 with respect to 3 phases), and all the coils are configured to be wound in the same direction. More specifically, since the total number S of slots is 6, the number of poles is 8, and the greatest common divisor is 2, the number of adjacent continuous coils X is 1 (X = S / M / G = 6/3). / 2), and all the coils are wound in the same direction. As described above, in the first embodiment, the greatest common divisor of the total number S of slots and the number of poles P which is the total number of permanent magnets is G, and the number of adjacent continuous coils X which is S / M / G with respect to the number of phases M is 1, which satisfies the condition that all the coils are wound in the same direction.

Further, the rotary electric machine 100 of the first embodiment is intended for a motor having 6 slots and 8 poles, but the present invention is a centralized winding motor in which the total number of slots is S and the number of poles (total number of permanent magnets) is P. The same effect can be obtained even for a fractional slot structure in which the number of slots Q for each pole and each phase obtained by S / 3 / P is smaller than 0.5 when the number of phases is 3. In general, the number of slots Q for each pole and each phase can be calculated by the following formula.

Q = S / (MP) = S / M / P
(S: total number of slots, M: number of phases, P: number of poles)
For example, in the case of a 9-slot 8-pole motor shown in FIG. 5, if the main pole and the auxiliary pole are alternately arranged in the same phase, two auxiliary poles are continuous in the circumferential direction. A wasted space is generated between the main pole and the auxiliary pole. A method for calculating the total number of main pole teeth N and the total number of auxiliary pole teeth for a 9-slot 8-pole motor will be described below.

The number of phases Q for each pole of a motor with 3 or 9 slots and 8 poles is
Q = S / M / P = 9/3/8 = 0.375
The number of slots for each pole and each phase is less than 0.5.

The greatest common divisor G of the total number of slots S (9) and the number of poles P (8) is 1. The number of adjacent continuous coils X is
X = S / M / G = 9/3/1 = 3
Will be. The number of adjacent continuous coils X is an odd number and a prime number larger than 1.

Next, the total number N of the main pole teeth and the total number of the auxiliary pole teeth are calculated. The total number N of the main pole teeth is a value obtained by dividing the total number S of slots by the number of adjacent continuous coils X, and can be calculated by the following formula.

N = S / X
(S: total number of slots, X: number of adjacent continuous coils)
When the total number N of the main pole teeth is calculated from the above formula, N = S / X = 9/3 = 3, and the total number N of the main pole teeth is 3. The total number of auxiliary pole teeth is 3, which is the same as the total number of main pole teeth N. Therefore, it is shown that the 9-slot 8-pole motor of FIG. 5 can be transformed into the configuration of the 6-slot 8-pole motor shown in FIGS. 1 and 2.

FIG. 6 is a diagram comparing the magnetomotive force distributions of the motor of the first embodiment and the motor of 9 slots and 8 poles. In FIG. 6, the number of turns and the current of the armature winding are the same.

Here, the number of turns of the armature winding in each tooth of the 9-slot 8-pole motor is one, and in the 6-slot 8-pole motor of the first embodiment, the main pole teeth is based on the number of adjacent continuous coils X. The number of turns of the armature winding shall be 3 (the number of 3 teeth combined). The magnetic field generated in the main pole teeth of the first embodiment is simply tripled, but the width of the auxiliary pole teeth can be narrowed to one half based on the magnitude of the magnetomotive force. By expanding the width of the main pole teeth, it is easy to change the design so that magnetic saturation does not occur.

Here, when the amplitude of the three-phase alternating current is 1 A, the magnetomotive force distribution of the U phase at the peak of the U phase is derived as shown in FIG. With respect to this distribution, the effective value of the fundamental wave that affects the torque of the motor is calculated to be 1.3 times that of the conventional value, and the effect of increasing the torque while reducing the number of coils can be obtained. If the torque is the same, the motor can be driven with a smaller current, so that the labor of the motor can be saved.

In the rotary electric machine 100 of the first embodiment, the greatest common divisor of the total number S of slots and the number of poles P which is the total number of permanent magnets is G, and the number of adjacent continuous coils X which is S / M / G with respect to the number of phases M. Is 1, and all the coils are wound in the same direction. Further, in the rotary electric machine 100 of the first embodiment, when the number of adjacent continuous coils X is an odd number and a prime number larger than 1, N obtained by dividing the total number S of slots by the number of adjacent continuous coils X is the total number of main pole teeth (the total number of main pole teeth). N = S / X).

According to the first embodiment, it is possible to provide a rotary electric machine capable of reducing the total number of main pole teeth while maintaining the output in a state where the auxiliary pole is applied to the fraction slot winding structure.

Next, Example 2 of the present invention will be described with reference to FIGS. 7 and 8. The second embodiment is different from the first embodiment in that the rotor 40 is an outer rotor type motor configured on the outer peripheral side of the stator 30.

For example, there is a 36-slot 32-pole motor in which the total number of slots S is 36 and the number of poles P is 32. The windings of each phase (U phase, V phase, W phase) are wound around three teeth adjacent to each other. In the case of this motor, the number of slots for each pole and each phase is determined by the equation shown in the first embodiment.
Q = S / M / P = 36/3/32 = 0.375
Will be. The number of slots for each pole and each phase is less than 0.5.

The greatest common divisor G of the total number of slots S (36) and the number of poles P (32) is 4. The number of adjacent continuous coils X is
X = S / M / G = 36/4/4 = 3
Will be. The number of adjacent continuous coils X is an odd number and a prime number larger than 1.

Next, the total number N of the main pole teeth and the total number of the auxiliary pole teeth are calculated. The total number N of the main pole teeth is determined by the formula shown in Example 1.
N = S / X = 36/3 = 12
Therefore, the total number N of the main pole teeth is 12. The total number of auxiliary pole teeth is 12, which is the same as the total number of main pole teeth N. Therefore, it is shown that the 36-slot 32-pole motor can be transformed into the configuration of the 24-slot 32-pole motor shown in FIGS. 7 and 7.

The rotary electric machine 200 of the second embodiment is a configuration example of a three-phase AC motor having 24 slots and 32 poles. FIG. 7 is an overall configuration diagram of a rotary electric machine (motor) according to a second embodiment of the present invention. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 7, the rotary electric machine 200 includes a stator 30, a rotor 40 rotatably supported outside the stator 30, a rotor case 6 covering the rotor 40, and a rotor case 6. It is composed of a fixed rotating shaft 4. In the second embodiment, the rotor case 6 does not necessarily have to cover the entire rotor 40, and if it is configured as a component for fixedly connecting the rotary shaft 4 and the rotor 40, the rotor 40 and the rotor case 6 are fixed. The method is not limited.

The rotor 40 faces the stator 30 via the gap 202. The stator 30 includes armature windings 212 (conductors 212A, 212B) wound around the main pole teeth. The rotor 40 includes a permanent magnet 222 attached to the rotor core.

FIG. 8 is a diagram showing the configuration inside the rotor case 6 in FIG. 7. FIG. 8 is a cross-sectional view of a rotary electric machine cut in a direction orthogonal to the rotation axis direction.

As shown in FIG. 8, the rotor 40 is composed of a rotor core 220 made of a magnetic material and a plurality of permanent magnets 222 attached to the surface of the rotor core 220. Each permanent magnet 222 is attached to the inner peripheral side surface of the rotor core 220, and the magnetization centers alternately face the gap 202 to form the magnetic poles of the N pole and the S pole.

The stator 30 is composed of a stator core 210, a main pole teeth 216, and an auxiliary pole teeth 218. The auxiliary pole tooth 218 is provided with an auxiliary pole tooth tip claw 219 extending in the circumferential direction from the tip of the tooth on the outer peripheral side.

By adopting such a configuration of this embodiment, the effect described in the first embodiment can be obtained, and at the same time, by adopting the outer rotor type, the teeth are arranged in the slot because the teeth are opened in the radial direction. It is possible to construct the auxiliary pole tooth tip claw without obstructing the area of the coil to be formed. As a result, the auxiliary pole tooth tip claw can smooth the permeance (reciprocal of magnetic resistance) distribution on the gap surface and suppress the torque pulsation during motor rotation caused by the magnetic flux of the permanent magnet. Further, since a magnetic path formed through the tip claw of the auxiliary pole tooth is generated, the effect of increasing the magnetic flux of the permanent magnet acting on the torque and improving the torque of the motor can be obtained.

The present invention is not limited to the above-described embodiment, and includes various modifications. The above-mentioned examples have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations.

100, 200 ... Rotor, 2 ... Stator case, 4 ... Rotating shaft, 6 ... Rotor case, 10, 30 ... Stator, 20, 40 ... Rotor, 102, 202 ... Gap, 104 ... Slot, 108 ... Magnetic path , 110, 210 ... Stator core, 112, 212 ... Armature winding, 112A, 112B, 212A, 212B ... Conductor, 114, 214 ... Stator yoke, 116, 116U, 116V, 216 ... Main pole teeth, 118, 118UV, 118VW, 118WU, 218 ... Auxiliary pole tooth, 120, 220 ... Rotor core, 122,222 ... Permanent magnet, 219 ... Auxiliary pole tooth tip claw

Claims (7)

In a rotary electric machine including a stator and a rotor facing the stator,
The rotor is composed of a cylindrical rotor core and a plurality of permanent magnets arranged in alternating directions along the circumference of the rotor core.
The stator includes a tubular stator yoke, a plurality of teeth extending from the stator yoke toward the rotor, and a plurality of slots formed between the plurality of teeth.
In the teeth, the main pole teeth that wind the coil and the auxiliary pole teeth that do not wind the coil are alternately arranged in the circumferential direction.
The greatest common divisor of the total number S of the slots and the number of poles P which is the total number of the permanent magnets is G, and the number of adjacent continuous coils X which is S / M / G with respect to the number of phases M is 1. A rotating electric machine characterized by being wound in the same direction. The rotary electric machine according to claim 1.
A rotary electric machine characterized in that the number of phases is 3 of U phase, V phase, and W phase, and the number of slots Q for each phase calculated by S / 3 / P is smaller than 0.5. The rotary electric machine according to claim 1.
A rotary electric machine characterized in that the width in the circumferential direction of the main pole teeth is wider than the width in the circumferential direction of the auxiliary pole teeth. The rotary electric machine according to claim 1.
The rotary electric machine is a rotary electric machine characterized by having an outer rotor type structure. The rotary electric machine according to claim 4.
A rotary electric machine characterized in that the tip of the auxiliary pole tooth is extended in the circumferential direction. In a rotary electric machine including a stator and a rotor facing the stator,
The rotor is composed of a cylindrical rotor core and a plurality of permanent magnets arranged in alternating directions along the circumference of the rotor core.
The stator includes a tubular stator yoke, a plurality of teeth extending from the stator yoke toward the rotor, and a plurality of slots formed between the plurality of teeth.
In the teeth, the main pole teeth that wind the coil and the auxiliary pole teeth that do not wind the coil are alternately arranged in the circumferential direction.
The greatest common divisor of the total number S of the slots and the number of poles P which is the total number of the permanent magnets is G, and the number of adjacent continuous coils X which is S / M / G with respect to the number of phases M is an odd number and a prime number larger than 1. In a certain case, N obtained by dividing the total number S of the slots by the number of adjacent continuous coils X is defined as the total number of the main pole teeth (N = S / X), and all the coils are wound in the same direction. A characteristic rotary electric machine. The rotary electric machine according to claim 6.
A rotary electric machine characterized in that the total number of the auxiliary pole teeth is the same as the total number N of the main pole teeth.

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