WO2020066507A1 - Rotating electric machine - Google Patents

Abstract

This rotating electric machine is provided with a rotor (12) having a plurality of magnetic poles disposed in the circumferential direction and a stator (13) disposed opposite the rotor. The stator is provided with: a stator core (32) having an annular yoke (34) and a plurality of teeth (35) extended from the yoke toward the rotor; and a multi-phase stator winding (33) wound around a slot (31) formed between the respective teeth. The plurality of teeth include first teeth (35A) and second teeth (35B), wherein the first teeth are disposed so as to deviate toward a first direction and the second teeth are disposed so as to deviate toward a second direction, the first direction and the second direction being opposite to each other in the circumferential direction.

Description

Rotating electric machine Cross-reference of related applications

This application is based on Japanese Patent Application No. 2018-179510 filed on September 25, 2018, the contents of which are incorporated herein by reference.

The present disclosure relates to a rotating electric machine.

Conventionally, for example, a rotating electric machine disclosed in Patent Document 1 is known as a technique for reducing torque ripple generated in the rotating electric machine. In the rotating electric machine described in Patent Literature 1, in a stator core configured by stacking a plurality of core sheets, the shape of a tooth tip is mirror-asymmetric with respect to a tooth center axis passing through a center in a circumferential direction of the tooth. The core sheets are formed so as to be formed and to be shifted in the circumferential direction of connecting portions for connecting the tooth tip portions to each other. More specifically, by using a first core block composed of a plurality of core sheets and a second core block composed of a plurality of core sheets as well, by turning the second core block upside down, Are arranged so that the circumferential positions of the connecting portions are different from each other. Thus, vibration and noise are reduced while increasing the rigidity of the stator.

Japanese Patent No. 6253849

In the rotating electric machine described in Patent Literature 1, when stacking a plurality of core blocks, it is necessary to turn over one of the core blocks, which leads to an increase in the size of manufacturing equipment for the rotating electric machine and an increase in manufacturing cost. It is concerned. In order to eliminate the turning over of the core block, it is conceivable to prepare two types of core sheets and stack the core sheets in the forward direction without turning over the core sheet. I am concerned. In other words, a core block is generally manufactured by pressing a core sheet into a desired shape and then stacking the core sheets. To arrange them in the direction, a press die must be prepared for each core block. For this reason, there is a concern about complication in manufacturing.

The present disclosure has been made in view of the above problems, and a main object of the present disclosure is to provide a rotating electric machine capable of appropriately realizing torque ripple reduction while simplifying manufacturing.

手段 Hereinafter, means for solving the above-mentioned problems and the effects thereof will be described.

The rotating electric machine of the means 1 is
A rotor having a plurality of magnetic poles provided in a circumferential direction,
A stator disposed opposite to the rotor,
The stator includes an annular yoke, a stator core having a plurality of teeth extending from the yoke toward the rotor, and a multi-phase wound around a slot formed between the teeth. And a stator winding of
The plurality of teeth include a first tooth and a second tooth,
The first teeth are biased toward a first direction of a first direction and a second direction that are opposite to each other in a circumferential direction, and the second teeth are biased toward a second direction. ing.

In the above configuration, the stator core is provided with the first teeth biased toward the first direction out of both sides in the circumferential direction and the second teeth biased toward the second direction out of both sides in the circumferential direction. . In this case, the torque ripple generated due to the first teeth and the torque ripple generated due to the second teeth can be offset, and the torque ripple generated in the rotating electric machine can be suitably suppressed.

In addition, since two types of teeth (first teeth and second teeth) are provided in the circumferential direction as the respective teeth of the stator core, for example, when the stator is manufactured, the core sheet may be turned upside down and stacked. No process is required. Therefore, simplification of manufacturing equipment and cost reduction for manufacturing the rotating electric machine can be realized.

The means 2 is the means according to the means 1, wherein the first teeth and the second teeth are different from each other in a shape of a tip portion on the rotor side with respect to the slot which is a winding accommodating region, and the first teeth are A first flange portion provided at the distal end portion so as to be biased toward the first direction, wherein the second teeth are provided at the distal end portion so as to be biased toward the second direction. Part.

According to the above configuration, the first teeth and the second teeth are provided with the flange portions (the first flange portion and the second flange portion) so as to be biased in different directions in the circumferential direction, and the flange of each of the teeth is provided. The portion can suitably suppress torque ripple generated in the rotating electric machine. In this case, even if the slot for accommodating the conductor of the stator winding is kept in a conventional linear shape, in other words, without changing the configuration related to the winding of the stator winding from the general configuration, the desired shape can be obtained. In the circumferential direction. Therefore, it is possible to preferably realize the reduction of the torque ripple while facilitating the winding of the stator winding.

The means 3 is the same as the means 1, wherein the first teeth and the second teeth are different in a radial direction of a slot forming portion corresponding to the slot, which is a winding accommodating region, and the first teeth are The slot forming portion is biased toward the first direction, and the second tooth has the slot forming portion biased toward the second direction.

According to the above configuration, the radial directions of the slot forming portions of the first teeth and the second teeth are made different from each other, so that the torque ripple generated in the rotating electric machine can be suitably suppressed.

The means 4 according to any one of the means 1 to 3, wherein the stator winding is formed of an n-phase winding, and the first teeth are formed with a straight line passing through a rotation center point of the rotor. The second teeth are provided so as to be biased toward the first direction by one offset angle, and the second teeth are provided so as to be biased toward the second direction at a second offset angle with respect to the straight line. The sum of the one offset angle and the second offset angle is “180 degrees / (2 × n × f)” or an electrical angle in order to reduce the torque ripple of order 2 × n × f (f is an integer of 1 or more) or It is near that.

(4) In a configuration in which the stator winding is formed of an n-phase winding, it is conceivable that 2 × n × f-order (f is an integer of 1 or more) torque ripple is generated as the stator winding is energized. In this regard, in the above configuration, the sum of the first deviation angle of the first teeth and the second deviation angle of the second teeth is set to an electrical angle of “180 degrees / (2 × n × f)” or its vicinity. Thereby, 2 × n × f-th order torque ripple can be suitably reduced.

Means 5 is any one of means 1 to 3, wherein the stator winding is formed of a three-phase winding, and wherein the first teeth are arranged in a line with respect to a straight line passing through a rotation center point of the rotor. The second teeth are provided so as to be biased toward the first direction by one offset angle, and the second teeth are provided so as to be biased toward the second direction at a second offset angle with respect to the straight line. The sum of the one offset angle and the second offset angle is 12 to 18 degrees or 27 to 33 degrees in electrical angle.

(4) In a configuration in which the stator windings are formed of three-phase windings, it is conceivable that 6f-order torque ripple may occur with the energization of the stator winding. In this regard, in the above configuration, the sum of the first deviation angle of the first teeth and the second deviation angle of the second teeth is set to an electrical angle of 12 to 18 degrees (that is, 15 degrees or near) or 27 to 33 degrees ( In other words, by setting the angle to 30 degrees or around), the twelfth-order or sixth-order torque ripple can be suitably reduced.

Means 6 is any one of means 1 to 3, wherein the stator winding has first and second windings of three phases wound around the slots, respectively. The wire and the second winding are configured to be energized by giving a phase difference of 30 degrees in electrical angle to each other, and the first teeth are connected to a straight line passing through the rotation center point of the rotor. The second teeth are provided so as to be biased toward the first direction at a first bias angle, and the second teeth are provided so as to bias toward the second direction at a second bias angle with respect to the straight line. The sum of the first deviation angle and the second deviation angle is 12 to 18 degrees in electrical angle.

According to the above configuration, the first winding and the second winding are energized by giving a phase difference of 30 degrees in electrical angle to each other, so that the sixth-order torque ripple can be reduced. Further, by setting the sum of the first deviation angle of the first teeth and the second deviation angle of the second teeth to an electrical angle of 12 to 18 degrees (that is, 15 degrees or near), a higher order than the sixth order can be obtained. The twelfth order torque ripple can be reduced.

The means 7 may be any one of the means 1 to 6, wherein the stator core comprises a first teeth group including a plurality of the first teeth arranged in a circumferential direction and a plurality of the second teeth arranged in a circumferential direction. And a second tooth group is provided as a tooth between the first tooth group and the second tooth group, and a facing surface facing the rotor is closer to the first tooth and the second tooth. Also has third teeth that are narrow in the circumferential direction.

In a configuration having a first tooth biased toward one circumferential direction (first direction) and a second tooth biased toward the other circumferential direction (second direction), the first tooth and the second tooth When the biased sides of the second teeth face each other, the teeth may interfere with each other, and due to this, there is a concern that the bias angle of each tooth cannot be sufficiently increased. In this regard, in the above-described configuration, the third surface in which the facing surface facing the rotor is narrower in the circumferential direction than the first tooth and the second tooth between the first tooth group and the second tooth group. Since the teeth are provided, the interference between the first teeth and the second teeth can be suppressed, and the bias angle of each of the teeth can be sufficiently increased.

Means 8 is any one of means 1 to 6, wherein the stator core comprises a first tooth group including a plurality of the first teeth arranged in a circumferential direction, and a plurality of the second teeth arranged in a circumferential direction. And a second tooth group is provided as a tooth between the first tooth group and the second tooth group and at a position where the bias of each of the first tooth and the second tooth is close to each other. Between a third tooth whose opposing surface facing the rotor is circumferentially narrower than the first tooth and the second tooth, and between the first tooth group and the second tooth group. And the first teeth and the second teeth are provided as teeth at positions where the deviations of the first teeth and the second teeth are separated from each other, and the opposing surfaces opposing the rotor are the first teeth and the second teeth. Having a fourth tooth which is wider in the circumferential direction than the teeth.

In the above configuration, the first tooth group and the second tooth group are located between the first tooth group and the second tooth group, and the positions of the first tooth and the second tooth approaching each other. A third tooth that is narrower in the circumferential direction than the second tooth is provided. This makes it possible to sufficiently increase the bias angle of each of the first and second teeth while suppressing interference between the first and second teeth.

Further, between the first teeth group and the second teeth group, and at positions where the first teeth and the second teeth are separated from each other, the opposing surfaces facing the rotor are the first teeth and the second teeth. Fourth teeth that are wider in the circumferential direction than the teeth are provided. Thereby, it is possible to prevent the separation distance between the teeth adjacent in the circumferential direction from being locally excessive.

(9) In the means (7) or (8), in the stator core, the number of the first teeth in the first teeth group is the same as the number of the second teeth in the second teeth group.

According to the above configuration, since the number of the first teeth in the first tooth group is the same as the number of the second teeth in the second tooth group, the torque ripple can be appropriately reduced.

The means 10 is the stator according to any one of means 1 to 9, wherein the stator core is a laminated core formed by laminating a plurality of core sheets, and the stator core is rolled in a rotating direction of the rotor. Sheets are stacked.

As described above, in the stator core having the first teeth and the second teeth, due to the difference in the circumferential deviation between the first teeth and the second teeth, a higher-order torque ripple is further added to the higher-order torque ripple. May be superimposed. In this regard, in the above configuration, since the core sheets are stacked in a state of being rolled in the rotation direction of the rotor, the phase of the torque ripple is shifted between core sheets having different positions in the rotation direction, and as a result, the secondary Torque ripple can be reduced.

When a magnetic steel sheet is manufactured by rolling, and a core sheet is manufactured from the magnetic steel sheet, the core sheet is rolled to produce a magnetic sheet in a direction along the sheet surface (that is, a direction perpendicular to the rolling direction). Even if the resistance is different, the magnetic resistance can be smoothed.

(11) The means (11) according to any one of the means (1) to (10), wherein the stator winding is made of a flat copper wire.

By configuring the stator winding with a rectangular copper wire, it becomes possible to increase the electric load of the rotating electric machine and to realize a higher output. Further, in the configuration in which each tooth is provided so as to be biased to one of the two sides in the circumferential direction, if the slot forming portion, which is the conductive wire accommodating portion, is linear and the distal end side is biased in the circumferential direction, the winding of the conductive wire can be achieved. The space factor of the conductor can be increased while facilitating the mounting.

The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing is
FIG. 1 is a longitudinal sectional view of a rotating electric machine, FIG. 2 is a cross-sectional view showing a rotor and a stator, FIG. 3 is a plan view of the stator core, 4A is an enlarged view of the first, second, and third teeth, and FIG. 4B is an enlarged view of the first, second, and fourth teeth. Yes, FIG. 5 is an enlarged view of the tip of the first tooth. FIG. 6 is a diagram showing a torque waveform of the rotating electric machine; FIG. 7 is a plan view showing a modification of the stator core. FIG. 8 is a diagram showing a configuration in which a core sheet is rolled in a stator core, FIG. 9 is a diagram showing a torque waveform of the rotating electric machine; FIG. 10 is a diagram showing a rotating electric machine system according to the second embodiment, FIG. 11 is a diagram showing a torque waveform of the rotating electric machine; FIG. 12 is a plan view showing a stator core according to the third embodiment, FIG. 13 is an enlarged view showing the first tooth, the second tooth, and the third tooth. FIG. 14 is a plan view showing a modification of the stator core.

Hereinafter, embodiments will be described with reference to the drawings. The rotating electric machine according to the present embodiment is used, for example, as a vehicle power source. However, the rotating electric machine can be widely used for industrial use, vehicles, ships, aircraft, home appliances, OA equipment, amusement machines, and the like. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals in the drawings, and the description of the parts with the same reference numerals is used.

(1st Embodiment)
The rotating electric machine 10 according to the present embodiment is an inner rotor type (inversion type) polyphase AC motor, and the outline thereof is shown in FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view showing a longitudinal section of a rotating electric machine 10 in a direction along a rotating shaft 11, and FIG. 2 is a cross sectional view of a rotor 12 and a stator 13 in a direction orthogonal to the rotating shaft 11. FIG. In the following description, the direction in which the rotating shaft 11 extends is defined as the axial direction, the direction radially extending around the rotating shaft 11 is defined as the radial direction, and the direction extending circumferentially around the rotating shaft 11 is defined as the circumferential direction.

The rotating electric machine 10 includes a rotor 12 fixed to a rotating shaft 11, a stator 13 provided at a position surrounding the rotor 12, and a housing 14 accommodating the rotor 12 and the stator 13. . The rotor 12 and the stator 13 are arranged coaxially. The housing 14 has a pair of bottomed cylindrical housing members 14a and 14b, and the housing members 14a and 14b are integrated by fastening bolts 15 in a state where the housing members 14a and 14b are joined together at the openings. The housing 14 is provided with bearings 16 and 17, and the rotating shaft 11 and the rotor 12 are rotatably supported by the bearings 16 and 17.

As shown in FIG. 2, the rotor 12 is configured as an embedded magnet type rotor (IPM rotor), and includes a rotor core 21 fixed to a rotation shaft 11 and a plurality of rotor cores held by the rotor core 21. And the permanent magnet 22. The rotor core 21 is configured by laminating a plurality of electromagnetic steel plates in the axial direction and fixing them by caulking or the like. The permanent magnets 22 are provided in the circumferential direction for each magnetic pole. In the present embodiment, the rotor 12 is provided with 10 poles (5 pole pairs) such that N poles and S poles are alternately arranged in the circumferential direction.

The stator 13 includes an annular stator core 32 having a plurality of slots 31 in a circumferential direction, and three-phase (U-phase, V-phase, and W-phase) fixed around the respective slots 31 of the stator core 32. And a secondary winding 33. The stator core 32 is formed by laminating a plurality of annular electromagnetic steel plates in the axial direction and fixing them by caulking or the like. That is, the stator core 32 is a laminated core formed by laminating a plurality of core sheets 32a (see FIG. 1). The stator core 32 has an annular yoke 34 and a plurality of teeth 35 projecting radially inward from the yoke 34 and arranged at a predetermined distance in the circumferential direction, and a slot 31 is provided between adjacent teeth 35. Are formed. The teeth 35 are provided at regular intervals in the circumferential direction.

Each of the slots 31 is provided adjacent to each other for each phase of the stator winding 33. That is, the stator core 32 is formed with a U-phase slot, a V-phase slot, and a W-phase slot which are repeatedly arranged two by two in the circumferential direction. Six slots 31 are provided for each magnetic pole, and the stator core 32 has a total of 60 slots 31 in the circumferential direction. A stator winding 33 is wound around each slot 31 so as to be wound around the teeth 35. Thus, in the stator winding 33, the in-phase conducting wires 36 whose logarithm is 2 for each magnetic pole in the stator core 32 are arranged side by side in the circumferential direction. For example, the stator winding 33 is configured by joining a plurality of conductor segments to each other.

The slots 31 are formed as rectangular openings extending in the radial direction in the cross section of the stator core 32, and are provided so as to extend radially from the center point of the stator core 32 (the rotation center of the rotor 12). Have been. In each slot 31, a conductor 36 made of a rectangular copper wire in a plurality of layers in the radial direction is accommodated as a stator winding 33.

回 転 As shown in FIG. 1, the rotating electrical machine system includes an inverter 41 and a control unit 42. Inverter 41 is connected to stator winding 33 of each phase in rotating electrical machine 10, and adjusts the current supplied to each phase. As is well known, the inverter 41 is a bridge circuit having the same number of upper and lower arms as the number of phases of the stator winding 33, and the upper and lower arms of each phase are provided with switches (semiconductor switching elements). The control unit 42 includes a microcomputer having a CPU and various memories, and turns on and off each switch of the inverter 41 at a predetermined switching frequency (carrier frequency) based on, for example, a power running torque command value or a generated voltage command value. Feedback control is performed for each phase current of the rotating electric machine 10. Further, the control unit 42 can control the phase of the current (phase current) of each phase of the stator winding 33.

回 転 In the rotating electric machine 10 having the above-described configuration, there is a concern that higher-order torque ripple may occur when the inverter 41 is energized. For example, a twelfth-order torque ripple may occur. Therefore, in the present embodiment, in order to reduce the torque ripple, the first core 35A and the second core 35B having different shapes are provided as the teeth 35 of the stator core 32. In this case, the first teeth 35A are provided to be biased toward the first direction out of the first direction and the second direction which are opposite to each other in the circumferential direction, and the second teeth 35B are biased toward the second direction. Is provided. Hereinafter, each tooth 35 of the stator core 32 will be described in detail.

FIG. 3 is a plan view of the stator core 32. As shown in FIG. 3, the stator core 32 has four types of teeth 35A, 35B, 35C, 35D having different shapes, and the teeth 35A to 35D are provided side by side in the circumferential direction. Each of the teeth 35A to 35D has a shape of a tip 37 on the rotor 12 side (inward in the radial direction) with respect to the slot 31 which is the winding accommodating region, and more specifically, the tips 35 of the teeth 35 are different from each other. In the portion 37, the presence / absence and orientation of the flange portions on both sides in the circumferential direction are different from each other. In this specification, the teeth 35A to 35D are also referred to as a first tooth 35A, a second tooth 35B, a third tooth 35C, and a fourth tooth 35D.

１The first teeth 35A and the second teeth 35B are teeth in which the directions of the flanges (in other words, the protruding portions that protrude in the circumferential direction) provided on the distal end portion 37 are opposite to each other in the circumferential direction. That is, the first teeth 35A project in the direction in which the distal end 37 is clockwise (first direction) in the circumferential direction, and the second teeth 35B are protruded in the counterclockwise direction (second direction) in the circumferential direction. ).

The stator core 32 has a first tooth group G1 composed of a plurality of first teeth 35A arranged in a circumferential direction, and a second tooth group G2 composed of a plurality of second teeth 35B arranged in a circumferential direction. As teeth between the first tooth group G1 and the second tooth group G2, a third tooth 35C and a fourth tooth 35D are provided. The first tooth group G1 and the second tooth group G2 have the same number of teeth, and in the present embodiment, each of the tooth groups G1 and G2 is provided with 29 first teeth 35A and second teeth 35B. .

Here, the boundary between the first teeth group G1 and the second teeth group G2 is two places in the circumferential direction, and at one boundary, the flange of the first teeth 35A and the flange of the second teeth 35B are mutually separated. The flanges of the first teeth 35A and the flanges of the second teeth 35B move closer to each other at the other boundary. A third tooth 35C and a fourth tooth 35D are provided in accordance with the space between the first tooth 35A and the second tooth 35B at each of these boundaries. In other words, the first teeth 35A and the second teeth 35B are main teeth, and the third teeth 35C and the fourth teeth 35D are auxiliary teeth serving as connections between the respective tooth groups G1 and G2. Further, the first teeth 35A and the second teeth 35B are asymmetric on both sides in the circumferential direction due to having a bias in one of the circumferential directions, that is, on both sides of the straight line L1 passing through the rotation center point (circle center) of the rotor 12. The third teeth 35C and the fourth teeth 35D are asymmetric teeth on both sides in the circumferential direction, that is, teeth on both sides of the straight line L1.

FIG. 4A is an enlarged view of the first teeth 35A, the second teeth 35B, and the third teeth 35C of the stator core 32.

As shown in FIG. 4 (a), the first tooth 35A has a flange portion 51 at the distal end portion 37 that protrudes in the clockwise direction (first direction) in the circumferential direction, and the second tooth 35B has The end portion 37 has a flange portion 52 protruding in a counterclockwise direction (second direction). In this case, in the first tooth 35A, the flange portion 51 is provided to be biased to one of the circumferential sides, and in the second tooth 35B, the flange portion 52 is biased to the other side in the circumferential direction. The third teeth 35C are provided between them so as to avoid interference with the teeth 35A and 35B. In other words, the third tooth 35C is provided at a position where each of the first tooth 35A and the second tooth 35B is closer to each other, and the opposing surface (the lower surface in the figure) opposing the rotor 12 is the first tooth 35A and the third tooth 35A. It is narrower in the circumferential direction than the two teeth 35B.

The flange portions 51 and 52 of the first teeth 35A and the second teeth 35B are formed in a triangular cross-section that extends to either side in the circumferential direction and becomes wider in the circumferential direction toward the tip end, that is, toward the rotor 12 side. . Further, the distal end portion 37 of the third tooth 35C is formed in a triangular tapered shape tapering in the circumferential direction in accordance with the inclination of the flange portions 51 and 52 on the slot 31 side. The flange 51 corresponds to a “first flange”, and the flange 52 corresponds to a “second flange”.

FIG. 4B is an enlarged view of the first teeth 35A, the second teeth 35B, and the fourth teeth 35D of the stator core 32.

FIG. 4B is different from FIG. 4A in that the flange 51 of the first tooth 35A and the flange 52 of the second tooth 35B are provided in a direction away from each other, and the fourth tooth is located therebetween. 35D is provided. That is, the fourth tooth 35D is provided at a position where each of the first tooth 35A and the second tooth 35B is separated from each other, and the opposing surface (the lower surface in the figure) facing the rotor 12 is the first tooth 35A and the fourth tooth 35D. It is wider in the circumferential direction than the two teeth 35B. A flange 54 having the same shape as the flanges 51 and 52 of the first teeth 35A and the second teeth 35B is formed on the distal end portion 37 of the fourth tooth 35D on both sides in the circumferential direction.

Here, the angle at which the first teeth 35A and the second teeth 35B are biased in the circumferential direction will be described. As shown in FIGS. 4A and 4B, the first teeth 35A are provided in the circumferential direction at a bias angle θm1 with respect to a straight line L1 passing through the rotation center point of the rotor 12, and the second teeth 35A are provided. 35B is provided so as to be offset in the circumferential direction at an offset angle θm2 with respect to the straight line L1. In the present embodiment, the center line (teeth center line) of the straight portion forming the slot 31 in each tooth 35 is in the same direction as the straight line L1, and the deviation angles θm1 and θm2 are determined by the tip 37 of the tip 37 with respect to the tooth center line. It can be defined as the angle of bias.

More specifically, as shown in FIG. 5, the position of the tip portion 37 at the center in the circumferential direction on the rotor facing surface (the lower surface in the drawing), that is, the circumferential dimensions W1 and W2 in the drawing are W1 = W2. Is set as a center point Pc, and a straight line connecting the center point Pc and a rotor center point (not shown) is set as a front end center line L2. In this case, the deviation angles θm1 and θm2 are the inclination angles of the center line L2 with respect to the straight line L1. Note that the deviation angle θm1 corresponds to a “first deviation angle”, and the deviation angle θm2 corresponds to a “second deviation angle”.

先端 The first tooth 35A has a tip portion 37 which is deviated clockwise in the drawing due to the flange 51 projecting to the right side in the drawing, and the deviation angle is θm1. In addition, the second tooth 35B has a front end 37 that is deviated in the counterclockwise direction in the figure because the flange 52 protrudes to the left in the figure, and the angle of deviation is θm2.

Specifically, assuming that the directions of the deviations θm1 and θm2 are opposite to each other with respect to the tooth center line (straight line L1) and are “1.5 degrees”, respectively, the first teeth 35A and the second teeth The sum of the deviation angles of the tip portions 37 at 35B is “θm1 + θm2 = 1.5 degrees + 1.5 degrees = 3 degrees”. Θm1 and θm2 are mechanical angles. To replace the sum of the deviation angles of the mechanical angles (θm1 + θm2) with the sum of the deviation angles of the electrical angles θe, the mechanical angle may be multiplied by the number of pole pairs p. That is, θe = p × (θm1 + θm2). In the present embodiment, since p = 5 and θm1 + θm2 = 3 degrees, θe = 5 × 3 degrees = 15 degrees. In this case, by setting the sum of the deviation angles of the first teeth 35A and the second teeth 35B to 15 degrees in electrical angle, the twelfth-order torque ripple can be suitably reduced.

The sum of the deviation angles of the teeth 35A and 35B may be around 15 degrees, and the twelfth order torque ripple can be reduced by appropriately changing the electrical angle within the range of 12 to 18 degrees. .

FIG. 6 is a diagram showing a torque waveform of the rotating electric machine 10. In FIG. 6, a chain line shows a torque waveform of a conventional rotating electrical machine in which the teeth 35 of the stator core 32 are not biased in the circumferential direction as a comparative example, and a solid line shows the present embodiment in which the teeth 35 are biased in the circumferential direction. 3 shows a torque waveform of the rotating electric machine 10 of the embodiment. It can be seen that the twelfth-order torque ripple is generated in the torque waveform indicated by the dashed-dotted line, whereas the twelfth-order torque ripple is significantly reduced in the torque waveform indicated by the solid line.

As a modified example of the rotary electric machine 10, when reducing the sixth-order torque ripple, the bias angles θm1 and θm2 of the first teeth 35A and the second teeth 35B in the stator core 32 may be set to “3 degrees”. . In this configuration, the sum of the deviation angles of the distal ends 37 of the first teeth 35A and the second teeth 35B is “θm1 + θm2 = 3 degrees + 3 degrees = 6 degrees”, which is replaced by the sum θe of the deviation angles of the electrical angles. And θe = 5 × 6 degrees = 30 degrees. In this case, by setting the sum of the deviation angles of the first teeth 35A and the second teeth 35B to 30 degrees in electrical angle, the sixth-order torque ripple can be suitably reduced.

The sum of the deviation angles of the teeth 35A and 35B may be around 30 degrees, and the sixth-order torque ripple can be reduced by appropriately changing the electrical angle within the range of 27 to 33 degrees. .

In the rotating electric machine 10, it is also possible to use a winding other than a three-phase winding as the stator winding 33, for example, a five-phase winding may be used. In this case, in the configuration in which the stator winding 33 is formed of a five-phase winding, in order to reduce, for example, the tenth-order torque ripple, in the stator core 32, the deviation angles θm1 and θm1 of the first teeth 35A and the second teeth 35B are set. θm2 may be set to “1.8 degrees”. In this configuration, the sum of the deviation angles of the distal ends 37 of the first teeth 35A and the second teeth 35B is “θm1 + θm2 = 1.8 degrees + 1.8 degrees = 3.6 degrees”, which is the deviation of the electrical angle. If it is replaced with the sum of angles θe, θe = 5 × 3.6 degrees = 18 degrees. In this case, by setting the sum of the deviation angles of the first teeth 35A and the second teeth 35B to 18 degrees in electrical angle, it is possible to suitably reduce the tenth-order torque ripple in the rotating electric machine having the five-phase winding. Can be. The sum of the deviation angles of the teeth 35A and 35B may be around 18 degrees, and even if the electrical angle is appropriately changed within the range of 15 to 21 degrees, the 10th-order torque ripple can be reduced. .

In short, when the stator winding 33 is formed of an n-phase winding, the first teeth 35A and the second teeth 35A are used to reduce the torque ripple of the order 2 × n × f (f is an integer of 1 or more). It is sufficient that the sum of the deviation angles at 35B is "180 degrees / (2 × n × f)" or a vicinity thereof in terms of the electrical angle. As described above, the number n of winding phases is three or five.

As shown in FIG. 7, the stator core 32 has a configuration in which two or more sets of a first tooth group G1 including a plurality of first teeth 35A and a second tooth group G2 including a plurality of second teeth 35B are provided. There may be. FIG. 7 shows a configuration in which two sets of the first tooth group G1 and the second tooth group G2 are provided. In FIG. 7, two first teeth groups G1 and two second teeth groups G2 are provided alternately in the circumferential direction, and are provided at four positions between the first teeth group G1 and the second teeth group G2. Two third teeth 35C and two fourth teeth 35D are provided.

Further, as described above, in the stator core 32 having the first teeth 35A and the second teeth 35B, the higher order torque ripple is caused by the difference in the circumferential deviation of the first teeth 35A and the second teeth 35B. It is feared that the secondary torque ripple is further superimposed on the above. A possible cause of the secondary torque ripple is that the shapes of the third teeth 35C and the fourth teeth 35D are different. Therefore, as a countermeasure, in the stator core 32, a configuration in which the core sheets 32a are stacked in a state of being rolled in the rotation direction (circumferential direction) of the rotor 12, that is, a core block including a predetermined number of core sheets 32a is rolled. It is good to have composition.

Specifically, the configuration shown in FIGS. 8A to 8E is adopted. FIG. 8A is a perspective view of the stator core 32 showing a state in which a plurality of core blocks are rolled in the axial direction. FIGS. 8B to 8E show a state where the stator core 32 is rolled at a predetermined angle in the circumferential direction. It is a perspective view which shows the core sheet 32a of the piled state. 8B to 8E show the rotation angle of each core sheet 32a with reference to the third teeth 35C and the fourth teeth 35D. The core sheets 32a (core blocks) are preferably rolled while being shifted at an angle of, for example, 30 degrees in the axial direction. However, the angle may be 45 degrees, 60 degrees, 90 degrees, or the like.

FIG. 9 is a diagram showing a torque waveform of the rotating electric machine 10. In FIG. 9, a waveform 1 indicated by an alternate long and short dash line shows, as Comparative Example 1, a torque waveform of a rotating electric machine in which the teeth 35 of the stator core 32 are not biased in the circumferential direction and the core block is not transposed. Waveform 2 indicated by a broken line indicates a torque waveform of a rotating electric machine in which the teeth 35 are biased in the circumferential direction but the core block is not transposed as Comparative Example 2, and waveform 3 indicated by a solid line indicates the teeth 35. 4 shows a torque waveform of a rotating electric machine in which the rotational direction is biased in the circumferential direction and the core block is transposed. The waveform 1 is the same as the one-dot chain line in FIG. 6, and the waveform 2 is the same as the solid line in FIG.

In FIG. 9, in waveform 2 (that is, the torque waveform of the rotating electric machine in which the teeth are biased in the circumferential direction, but are not rolled), the twelfth-order torque ripple is significantly reduced as described above. , Secondary torque ripple has occurred. This torque ripple is caused by the difference in the circumferential deviation between the first teeth 35A and the second teeth 35B, more specifically, the third teeth 35C and the fourth teeth 35D provided in accordance with the circumferential deviation. Likely to occur.

On the other hand, in the waveform 3, it can be seen that the second-order torque ripple with respect to the waveform 2 is reduced. That is, since the core sheets 32a are stacked in a state in which they are rolled in the rotation direction of the rotor 12, the torque ripples are shifted in phase between the core sheets 32a having different positions in the rotation direction. Torque ripple has been reduced.

According to the embodiment described in detail above, the following excellent effects can be obtained.

The stator core 32 has a configuration in which the first teeth 35A are biased toward one of the two sides in the circumferential direction, and the second teeth 35B are biased toward the other side in the circumferential directions. In this case, the torque ripple generated due to the first teeth 35A and the torque ripple generated due to the second teeth 35B can be offset, and the torque ripple generated in the rotating electric machine 10 can be appropriately suppressed. Can be.

Further, since two kinds of teeth (first teeth 35A and second teeth 35B) are provided in the circumferential direction as the respective teeth 35 of the stator core 32, for example, the core sheet is turned upside down when the stator 13 is manufactured. This eliminates the need for steps such as stacking. Therefore, simplification of manufacturing equipment for manufacturing the rotating electric machine 10 and reduction in cost can be realized.

Since the flanges 51 and 52 are provided at the distal ends 37 of the first teeth 35A and the second teeth 35B so as to be biased in different directions in the circumferential direction, the rotating electric machine 10 is provided by the flanges 51 and 52. The torque ripple generated at the time can be suitably suppressed. In this case, even if the slot 31 for accommodating the conductor 36 of the stator winding 33 has a conventional linear shape, in other words, the configuration related to the winding of the stator winding 33 is not changed at all from the general configuration. Even so, a desired circumferential deviation can be provided. Therefore, torque ripple reduction can be suitably realized while facilitating the winding of the stator winding 33.

(4) In the configuration in which the stator winding 33 is formed of a three-phase winding, it is conceivable that 6f-order torque ripple may be generated as the stator winding 33 is energized. In this regard, in the above configuration, the sum of the deviation angles of the first teeth 35A and the second teeth 35B is set to an electrical angle of 12 to 18 degrees (that is, 15 degrees or near), so that the twelfth-order torque ripple is preferably used. Can be reduced. By setting the sum of the deviation angles of the first teeth 35A and the second teeth 35B to 27 to 33 degrees in electrical angle (that is, 30 degrees or near), the sixth-order torque ripple can be suitably reduced. it can.

As the teeth between the first teeth group G1 and the second teeth group G2 and at positions where the bias of each of the first teeth 35A and the second teeth 35B approaches each other, the facing surface facing the rotor 12 is The third teeth 35C which are narrower in the circumferential direction than the first teeth 35A and the second teeth 35B are provided. This makes it possible to sufficiently increase the bias angle of each of the teeth 35A and 35B while suppressing the interference between the first teeth 35A and the second teeth 35B.

Further, as the teeth between the first teeth group G1 and the second teeth group G2 and in which the first teeth 35A and the second teeth 35B are separated from each other, the opposing surface facing the rotor 12 is provided. The fourth teeth 35D, which are wider in the circumferential direction than the first teeth 35A and the second teeth 35B, are provided. Thereby, it is possible to prevent the separation distance between the teeth 35 adjacent in the circumferential direction from being locally excessive.

た め In the stator core 32, the number of the first teeth 35A in the first tooth group G1 and the number of the second teeth 35B in the second tooth group G2 are made the same, so that the torque ripple can be appropriately reduced.

In the stator core 32 having the first teeth 35A and the second teeth 35B, due to the difference in the circumferential deviation between the first teeth 35A and the second teeth 35B, the secondary torque is further reduced to a higher order torque ripple. There is a concern that torque ripples may overlap. In this regard, in the above configuration, since the core sheets 32a are stacked in a state of being rolled in the rotation direction of the rotor 12, the phases of the torque ripple are shifted between the core sheets 32a having different positions in the rotation direction. Therefore, the secondary torque ripple can be reduced.

When the electromagnetic steel sheet is manufactured by rolling and the core sheet 32a is manufactured from the electromagnetic steel sheet, by rolling the core sheet 32a, the direction along the sheet surface (that is, the direction perpendicular to the rolling direction). Thus, even if the magnetic resistance is different, the magnetic resistance can be smoothed.

(4) Since the stator winding 33 is formed of a rectangular copper wire, it is possible to increase the electric load of the rotating electric machine 10 and to realize a higher output. Further, in the configuration in which the teeth 35 are provided so as to be biased to one side in the circumferential direction, if the slot forming portion, which is the conductive wire accommodating portion, is linear and the distal end portion 37 is biased in the circumferential direction, the winding of the conductive wire 36 is possible. And the space factor of the conductor 36 can be increased.

Hereinafter, an embodiment different from the above-described first embodiment will be described focusing on differences from the first embodiment.

(2nd Embodiment)
FIG. 10 shows the configuration of the present embodiment. In FIG. 10, the stator winding 33 has a three-phase first winding 33 </ b> A and a second winding 33 </ b> B wound around the slots 31 of the stator core 32. That is, the stator winding 33 is configured by a three-phase winding set including two three-phase windings. The first winding 33A and the second winding 33B have the same electrical characteristics, The common stator cores 32 are arranged so as to be shifted from each other by an electrical angle of 30 degrees.

The first winding 33A is composed of U1, V1 and W1 phase windings, and the inverter 41A is connected to each of these windings. The second winding 33B is composed of U2-phase, V2-phase, and W2-phase windings, and the inverter 41B is connected to each of the windings. Each of the inverters 41A and 41B has upper and lower arm switches (semiconductor switching elements) for each phase, similarly to the inverter 41 described above. Each switch is turned on / off by a command from the control unit 42, and the current of each phase is changed. Feedback controlled. To the first winding 33A and the second winding 33B, a three-phase AC current having an equal amplitude and a phase shifted from each other by an electrical angle of 30 degrees is supplied by the control unit 42.

As described in the first embodiment, the stator core 32 has the first teeth 35A provided to be biased to one of the circumferential sides and the second teeth 35A provided to be biased to the other side of the circumferential sides. The first teeth 35A and the second teeth 35B have a deviation angle sum of 15 degrees or an electrical angle (12 degrees to 18 degrees). Note that, in addition to the first teeth 35A and the second teeth 35B, the configurations of the third teeth 35C and the fourth teeth 35D are also as described above.

According to the above configuration, the first winding 33 </ b> A and the second winding 33 </ b> B are energized by giving a phase difference of 30 degrees in electrical angle to each other, so that the sixth-order torque ripple generated when the rotating electric machine 10 is driven is provided. Can be reduced. In addition, by setting the sum of the deviation angles of the first teeth 35A and the second teeth 35B to 15 degrees or near in electrical angle, it is possible to reduce the 12th-order torque ripple higher than the 6th-order. .

FIG. 11 is a diagram illustrating a torque waveform of the rotating electric machine 10 in the rotating electric machine 10 of the present embodiment. In FIG. 11, the dashed line indicates the torque waveform of the rotating electrical machine 10 when the energization phase difference is not applied to the windings 33A and 33B, and the solid line indicates the rotation when the energization phase difference is applied to the windings 33A and 33B. 3 shows a torque waveform of the electric machine 10. In the torque waveform shown by the broken line, the sixth-order torque ripple occurs, whereas in the torque waveform shown by the solid line, the sixth-order torque ripple is reduced.

(Third embodiment)
In the first embodiment, in the stator core 32, flange portions 51 and 52 projecting from the distal ends of the first teeth 35A and the second teeth 35B to the opposite sides in the circumferential direction are provided, thereby forming the first teeth. Although the configuration is such that the 35A and the second teeth 35B are biased in directions opposite to each other in the circumferential direction, this configuration is changed in the present embodiment. In the present embodiment, the first teeth 35A and the second teeth 35B are different from each other in a radial direction of a slot forming portion corresponding to the slot 31 which is the winding accommodating region. Are biased toward the first direction out of both sides in the circumferential direction, and the second teeth 35B have the slot forming portions biased toward the second direction out of both sides in the circumferential direction.

FIG. 12 is a plan view showing the stator core 32 in the present embodiment. In FIG. 12, the stator core 32 has four types of teeth 35A, 35B, 35C, 35D as teeth 35 extending radially inward from the yoke 34, and the teeth 35A to 35D are arranged in the circumferential direction. Is provided. Each of the teeth 35A to 35D is different from each other in the shape in plan view and the direction or presence or absence of deviation on both sides in the circumferential direction. The stator core 32 has a first teeth group G1 composed of a plurality of first teeth 35A and a second teeth group G2 composed of a plurality of second teeth 35B. As teeth between the teeth group G2, a third tooth 35C and a fourth tooth 35D are provided.

The first teeth 35A and the second teeth 35B are linear, respectively, and the direction of the teeth center line extending linearly is different from the straight line L11 passing through the rotation center point, and the direction of the teeth center line is The teeth are mutually opposite in the circumferential direction. That is, the direction of the center line of the first teeth 35A is inclined to one side in the circumferential direction, and the direction of the center line of the second teeth 35B is inclined to the other side in the circumferential direction. Thereby, the first teeth 35A are provided to be biased toward the first direction out of the first direction and the second direction that are opposite to each other in the circumferential direction, and the second teeth 35B are biased toward the second direction. It is designed to be provided.

Further, among the third teeth 35C and the fourth teeth 35D provided at the boundary between the first teeth group G1 and the second teeth group G2, the third teeth 35C are biased by the first teeth 35A and the second teeth 35B, respectively. Are provided close to each other, and the facing surface (the lower surface in the figure) facing the rotor 12 is narrower in the circumferential direction than the first teeth 35A and the second teeth 35B. The fourth teeth 35D are provided at positions where the first teeth 35A and the second teeth 35B are separated from each other, and the opposing surface (the lower surface in the figure) facing the rotor 12 is the first teeth 35A and the fourth teeth 35A. It is wider in the circumferential direction than the two teeth 35B.

In the stator core 32 shown in FIG. 12, a flange portion extending in the circumferential direction is not provided at the distal end portion 37 of each tooth 35, but a configuration in which a flange portion is provided may be employed.

Here, the bias angle θm11 of the first teeth 35A and the bias angle θm12 of the second teeth 35B will be described with reference to FIG. The deviation angles θm11 and θm12 of the first teeth 35A and the second teeth 35B can be defined as angles of deviation (inclination) of the teeth 35A and 35B with respect to a straight line L11 passing through the rotation center point of the rotor 12. The inclination angle of the tooth center line L12 passing through the centers of the teeth 35A and 35B with respect to the straight line L11 connecting the circumferential center point Pd at the base end of the teeth 35 on the yoke 34 side and the rotor center point (not shown). Has become.

That is, the first teeth 35A have their teeth extending in a clockwise direction in the drawing with respect to a straight line L11 passing through the rotation center point of the rotor 12, and the angle of deviation is θm11. In the second tooth 35B, the tooth extending direction is similarly deviated in the counterclockwise direction in the figure with respect to the straight line L11, and the deviation angle is θm12.

For example, when the deviation angles θm11 and θm12 are each set to “1.5 degrees”, the sum of the deviation angles of the first teeth 35A and the second teeth 35B is 3 degrees in mechanical angle, which is 15 degrees (3 Degree x 5 pole pairs). In this case, by setting the sum of the deviation angles of the first teeth 35A and the second teeth 35B to 15 degrees or an electrical angle (angle within 12 degrees to 18 degrees) in electrical angle, the 12th-order torque ripple can be suitably reduced. Can be reduced.

In order to reduce the sixth-order torque ripple, the deviation angles θm11 and θm12 are each set to “3 degrees”, and the sum of the deviation angles in the first teeth 35A and the second teeth 35B is set to 6 degrees in mechanical angle. That is, the sum of the deviation angles of the first teeth 35A and the second teeth 35B may be set to an electrical angle of 30 degrees or near (an angle within 27 degrees to 33 degrees).

Even with the configuration of the present embodiment, the torque ripple generated due to the first teeth 35A and the torque ripple generated due to the second teeth 35B can be offset, and the torque generated in the rotating electric machine 10 can be reduced. Ripple can be suitably suppressed.

(Other embodiments)
The above embodiment may be changed as follows, for example.

· As a modification of the stator core 32, it is also possible to use the configuration shown in FIGS. FIGS. 14A to 14C show configurations in which the shape of the distal end portion 37 of the teeth 35 is different. Although FIGS. 14A to 14C show the first teeth 35A, the same applies to the second teeth 35B.

で は In FIG. 14 (a), the flange shape at the distal end 37 of the first tooth 35A is rectangular. That is, the flange portion 51 projects to one side in the circumferential direction, and has substantially the same width in the circumferential direction inside and outside the radial direction. According to this configuration, the magnetic resistance of the distal end portion 37 is reduced, so that more magnetic flux with the rotor 12 can be passed, and the torque can be improved.

で は In FIG. 14 (b), the flange portion 51 protrudes from the distal end portion 37 of the first tooth 35A to both sides in the circumferential direction. However, since the protrusion amounts of the flange portion 51 are different from each other on one side and the other side in the circumferential direction, the flange portion 51 is provided to be biased to one of the two sides in the circumferential direction. In the case where the configuration of FIG. 14B is employed as the first teeth 35A and the second teeth 35B, the amount of protrusion of the flanges 51 and 52 in the circumferential direction is small, so that the first teeth group G1 and the second teeth 35 The configuration in which the third teeth 35C and the fourth teeth 35D are not provided at the boundary with the teeth group G2, that is, the configuration in which the teeth 35 of the stator core 32 include only the first teeth 35A and the second teeth 35B is possible. Becomes

In FIG. 14C, the distal ends 37 of the first teeth 35 </ b> A adjacent in the circumferential direction are connected to each other via the connecting portion 55. Specifically, the connecting portion 55 is provided as a portion whose thickness in the radial direction is thinner than the flange portion 51, and the leading end portions 37 of the teeth 35 are connected in a ring shape to make each slot 31 a closed slot. Has become. According to this configuration, in addition to the torque ripple reducing effect due to the fact that each tooth 35 has a bias in the circumferential direction, the strength of each tooth 35 in the stator core 32 can be improved.

In the above embodiment, the third teeth 35C and the fourth teeth 35D are provided at the boundary between the first teeth group G1 and the second teeth group G2 (for example, at two boundaries shown in FIG. 3). Alternatively, the third teeth 35 </ b> C may be provided at any of the boundaries.

In the rotating electric machine 10, the number of poles and the number of slots are arbitrary. That is, instead of the configuration of 10 poles and 60 slots, for example, a configuration of 8 poles and 24 slots may be used.

In the above-described embodiment, in the stator core 32, the first teeth 35A provided to be biased to one side in the circumferential direction and the second teeth 35B provided to be biased to the other side in the circumferential direction are each one. The first teeth 35A and the second teeth 35B may be provided in plural types (two types, three types, four types, and the like). For example, in each of the first teeth 35A and the second teeth 35B, two types of teeth are provided in which the directions of deviation in the circumferential direction are the same and the deviation angles in the circumferential direction are 15 degrees and 30 degrees, respectively. Thereby, a plurality of orders of torque ripple can be reduced suitably.

In the above embodiment, an example of application to a rotating electric machine having an inner rotor type embedded magnet type rotor (IPM rotor) has been described, but application to other rotating electric machines is also possible. For example, application to a rotating electric machine having a surface magnet type rotor (SPM rotor) is possible. In a rotating electric machine having an SPM rotor, it is easy to provide a low-torque ripple magnetic circuit. However, according to the configuration of the present application, a low-torque ripple magnetic circuit can be achieved with a lower torque ripple. Further, the present invention can be applied to an outer rotor type rotating electric machine. The outer rotor type has a higher torque than the inner rotor type, but it is difficult to form a magnetic circuit with a low torque ripple.However, according to the configuration of the present application, the torque ripple can be suitably reduced. It becomes possible to make a circuit.

In place of the radial gap type rotating electric machine, application to an axial gap type rotating electric machine is also possible. The axial gap type has a higher torque than the radial gap type, but it is difficult to provide a magnetic circuit with a low torque ripple.However, according to the configuration of the present application, the torque ripple can be suitably reduced, so that a high torque and a low torque ripple can be obtained. Magnetic circuit.

Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and the structure. The present disclosure also encompasses various modifications and variations within an equivalent range. In addition, various combinations and forms, and other combinations and forms including only one element, more or less, are also included in the scope and spirit of the present disclosure.

Claims (11)

1. A rotor (12) having a plurality of magnetic poles provided in a circumferential direction;
   A stator (13) disposed opposite to the rotor,
   The stator is formed between a stator core (32) having an annular yoke (34) and a plurality of teeth (35) extending from the yoke toward the rotor, and the teeth. And a multi-phase stator winding (33) wound around a slot (31).
   The plurality of teeth include a first tooth (35A) and a second tooth (35B),
   The first teeth are biased toward a first direction of a first direction and a second direction that are opposite to each other in a circumferential direction, and the second teeth are biased toward a second direction. Rotating electric machine.
2. The first teeth and the second teeth are different from each other in a shape of a tip portion closer to the rotor than the slot that is a winding accommodating region,
   The first tooth has a first flange portion (51) provided at the distal end portion so as to be biased toward the first direction, and the second tooth has a distal end portion at a side in the second direction at the distal end portion. The rotating electric machine according to claim 1, further comprising a biased second flange portion (52).
3. The first teeth and the second teeth are different from each other in a radial direction of a slot forming portion corresponding to the slot, which is a winding accommodating region,
   The rotation of claim 1, wherein the first teeth have the slot forming portions biased toward the first direction, and the second teeth have the slot forming portions biased toward the second direction. Electric machine.
4. The stator winding includes an n-phase winding,
   The first teeth are provided to be offset toward the first direction by a first offset angle with respect to a straight line passing through the rotation center point of the rotor, and the second teeth are provided with a second offset with respect to the straight line. Being biased toward the second direction at a bias angle,
   The sum of the first deviation angle and the second deviation angle is expressed as “180 degrees / (2 × n × f)” in terms of electrical angle in order to reduce 2 × n × f-order (f is an integer of 1 or more) torque ripple. The rotating electric machine according to any one of claims 1 to 3, wherein the rotating electric machine is at or near the rotating electric machine.
5. The stator winding is formed of a three-phase winding,
   The first teeth are provided to be offset toward the first direction by a first offset angle with respect to a straight line passing through the rotation center point of the rotor, and the second teeth are provided with a second offset with respect to the straight line. Being biased toward the second direction at a bias angle,
   The rotating electric machine according to any one of claims 1 to 3, wherein a sum of the first deviation angle and the second deviation angle is an electrical angle of 12 to 18 degrees or 27 to 33 degrees.
6. The stator winding has a first winding (33A) and a second winding (33B) of each of three phases wound around the slot, and the first winding and the second winding are: It is designed to be energized by giving a phase difference of 30 degrees in electrical angle to each other,
   The first teeth are provided to be offset toward the first direction by a first offset angle with respect to a straight line passing through the rotation center point of the rotor, and the second teeth are provided with a second offset with respect to the straight line. Being biased toward the second direction at a bias angle,
   4. The rotating electric machine according to claim 1, wherein a sum of the first deviation angle and the second deviation angle is an electrical angle of 12 to 18 degrees.
7. The stator core includes:
   A first tooth group (G1) including a plurality of the first teeth arranged in a circumferential direction; and a second tooth group (G2) including a plurality of the second teeth arranged in a circumferential direction.
   An opposing surface, which is provided as a tooth between the first teeth group and the second teeth group and faces the rotor, is narrower in a circumferential direction than the first teeth and the second teeth. The rotating electric machine according to any one of claims 1 to 6, further comprising a third tooth (35C).
8. The stator core includes:
   A first tooth group (G1) including a plurality of the first teeth arranged in a circumferential direction, and a second tooth group (G2) including a plurality of the second teeth arranged in a circumferential direction;
   The first tooth group and the second tooth group are provided between the first tooth group and the second tooth group, and each of the first teeth and the second teeth is provided as a tooth at a position approaching each other. A third tooth (35C) narrower in the circumferential direction than the first tooth and the second tooth;
   The first tooth group and the second tooth group are provided as teeth at positions where the bias of each of the first teeth and the second teeth is separated from each other, and an opposing surface facing the rotor is provided. A fourth tooth (35D) wider in the circumferential direction than the first tooth and the second tooth,
   The rotating electric machine according to any one of claims 1 to 6, further comprising:
9. The rotating electric machine according to claim 7 or 8, wherein in the stator core, the number of the first teeth in the first tooth group is the same as the number of the second teeth in the second tooth group.
10. The stator core is a laminated core formed by laminating a plurality of core sheets (32a),
    The rotating electric machine according to any one of claims 1 to 9, wherein the core sheets are stacked in a state where the core sheets are rolled in a rotation direction of the rotor.
11. The rotating electric machine according to any one of claims 1 to 10, wherein the stator winding is formed of a rectangular copper wire.

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