WO2022097322A1 - Rotary electrical machine - Google Patents

Abstract

A rotary electrical machine according to an aspect of the present invention comprises: a rotor having a plurality of magnets; and a stator having a plurality of teeth arranged apart from each other side by side so as to extend radially inward from a core back. The magnets include a pair of first magnets, and a second magnet which is disposed at a circumferential position between the first magnets and which extends in a direction perpendicular to the radial direction when viewed in an axial direction. When viewed in the axial direction, the length of the second magnet in the radial direction is shorter than that of each of the first magnets in a direction perpendicular to the direction in which the first magnets extend. In a state where the circumferential-direction center of the second magnet is disposed at the same circumferential-direction position as that of the circumferential-direction center of a given one tooth, both ends of the second magnet in the circumferential direction are each positioned between the circumferential-direction center of a tooth disposed next to the given tooth and the circumferential-direction center of a slot disposed second next to the given one tooth on the same side as that of the tooth disposed next to the given one tooth.

Description

Rotating electric machine

The present invention relates to a rotary electric machine.

A rotary electric machine equipped with a rotor core and a permanent magnet arranged in a hole provided in the rotor core is known. For example, Patent Document 1 describes a rotary electric machine in which three permanent magnets are arranged in a ∇ shape.

International Publication No. 2018/159181

In the above-mentioned rotary electric machine, among the three permanent magnets, the permanent magnets located on the outer side in the radial direction are close to the outer peripheral surface of the rotor core, so that there is a concern that the strength of the rotor core may decrease due to centrifugal force. Therefore, if the permanent magnet rotor core is arranged at a position far from the outer peripheral surface, there arises a problem that the output is reduced. Further, in the rotary electric machine as described above, further reduction of torque ripple has been required.

The present invention has been made in consideration of the above points, and one of the objects of the present invention is to provide a rotary electric machine having a structure capable of achieving high output and reducing torque ripple.

One embodiment of the rotary electric machine of the present invention comprises a rotor rotatable about a central axis and a stator located radially outside the rotor, wherein the rotor has a rotor core having a plurality of accommodating holes. Each of the plurality of housing holes has a plurality of magnets housed therein, and the stator has an annular core back surrounding the rotor core, and extends radially inward from the core back and is spaced in the circumferential direction. It has a stator core with a plurality of teeth arranged side by side, and the teeth are provided at a base extending radially inward from the core back and at the radially inner end of the base on both sides in the circumferential direction from the base. The plurality of magnets are arranged with a distance from each other in the circumferential direction, and a pair of magnets extending in a direction away from each other in the radial direction from the inside in the radial direction to the outside in the radial direction when viewed in the axial direction. Is arranged at a circumferential position between the pair of first magnets and the pair of first magnets on the radial outer side of the radial inner end portion of the pair of first magnets, and is orthogonal to the radial direction when viewed in the axial direction. The radial length of the second magnet, including the second magnet extending in the extending direction, is shorter than the length of the first magnet in the direction orthogonal to the extending direction of the first magnet when viewed in the axial direction. When viewed in the axial direction, both ends of the second magnet in the circumferential direction are in a certain state in which the circumferential center of the second magnet is arranged at the same circumferential position as the circumferential center of the tooth. In, on the same side as the circumferential center of the tooth arranged one next to the one tooth and the tooth arranged one next to the tooth, the teeth are arranged two adjacent to the one tooth. It is located between the center of the slot in the circumferential direction.

According to one aspect of the present invention, in a rotary electric machine, high output can be realized and torque ripple can be reduced.

FIG. 1 is a cross-sectional view showing a rotary electric machine of the present embodiment. FIG. 2 is a cross-sectional view showing a part of the rotary electric machine of the present embodiment, and is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a cross-sectional view showing a magnetic pole portion of the rotor and a part of the stator core of the present embodiment. FIG. 4 is an enlarged cross-sectional view of the first flux barrier portion and the second flux barrier portion of the present embodiment. FIG. 5 is a diagram showing the relationship between the electric angular order and the amplitude of the electromagnetic excitation force. FIG. 6 is a diagram showing the relationship between the electric angular order and the amplitude of the electromagnetic excitation force.

Hereinafter, the rotary electric machine according to the embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each configuration easy to understand, the scale and number of each structure may be different from the actual structure.

The Z-axis direction appropriately shown in each figure is a vertical direction in which the positive side is the "upper side" and the negative side is the "lower side". The central axis J appropriately shown in each figure is a virtual line that is parallel to the Z-axis direction and extends in the vertical direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the vertical direction is simply referred to as "axial direction", and the radial direction centered on the central axis J is simply referred to as "radial direction". The circumferential direction centered on is simply called the "circumferential direction". The arrow θ appropriately shown in each figure indicates the circumferential direction. The arrow θ faces clockwise with respect to the central axis J when viewed from above. In the following description, the side of the circumferential direction toward which the arrow θ faces with respect to a certain object, that is, the side traveling clockwise when viewed from above, is referred to as "one side in the circumferential direction", and the side in the circumferential direction with respect to a certain object. Of these, the side opposite to the side to which the arrow θ faces, that is, the side that advances counterclockwise when viewed from above, is called the "other side in the circumferential direction".

In addition, the vertical direction, the upper side, and the lower side are simply names for explaining the arrangement relations of each part, and the actual arrangement relations, etc. are the arrangement relations, etc. other than the arrangement relations, etc. indicated by these names. There may be.

[Rotating electric machine]
As shown in FIG. 1, the rotary electric machine 1 is an inner rotor type rotary electric machine. In the present embodiment, the rotary electric machine 1 is a three-phase AC type rotary electric machine. The rotary electric machine 1 is, for example, a three-phase motor driven by supplying a three-phase alternating current power source. The rotary electric machine 1 includes a housing 2, a rotor 10, a stator 60, a bearing holder 4, and bearings 5a and 5b.

The housing 2 houses the rotor 10, the stator 60, the bearing holder 4, and the bearings 5a and 5b inside. The bottom of the housing 2 holds the bearing 5b. The bearing holder 4 holds the bearing 5a. The bearings 5a and 5b are, for example, ball bearings.

The stator 60 is located on the radial outer side of the rotor 10. The stator 60 includes a stator core 61, an insulator 64, and a plurality of coils 65. The stator core 61 has a core back 62 and a plurality of teeth 63. The core back 62 is located on the outer side in the radial direction of the rotor core 20, which will be described later. In the following FIGS. 2 to 4, the coil 65 is not shown. In FIGS. 2 to 4, the insulator 64 is not shown.

As shown in FIG. 2, the core back 62 is an annular shape surrounding the rotor core 20. The core back 62 is, for example, an annular shape centered on the central axis J.

The plurality of teeth 63 extend radially inward from the core back 62. The plurality of teeth 63 are arranged side by side at intervals in the circumferential direction. The plurality of teeth 63 are arranged at equal intervals, for example, along the circumferential direction. For example, 48 teeth 63 are provided. That is, the number of slots 67 in the rotary electric machine 1 is, for example, 48. As shown in FIG. 3, the plurality of teeth 63 have a base portion 63a and an umbrella portion 63b, respectively.

The base 63a extends radially inward from the core back 62. The circumferential dimension of the base 63a is, for example, the same over the entire radial direction. The circumferential dimension of the base 63a may become smaller, for example, toward the inside in the radial direction.

The umbrella portion 63b is provided at the radial inner end of the base portion 63a. The umbrella portion 63b protrudes from the base portion 63a on both sides in the circumferential direction. The circumferential dimension of the umbrella portion 63b is larger than the circumferential dimension at the radially inner end of the base 63a. The radial inner surface of the umbrella portion 63b is a curved surface along the circumferential direction. The radial inner surface of the umbrella portion 63b extends in an arc shape centered on the central axis J when viewed in the axial direction. The radial inner surface of the umbrella portion 63b faces the outer peripheral surface of the rotor core 20, which will be described later, via a gap in the radial direction. Among the teeth 63 adjacent to each other in the circumferential direction, the umbrella portions 63b are arranged side by side with a gap in the circumferential direction.

The plurality of coils 65 are attached to the stator core 61. As shown in FIG. 1, the plurality of coils 65 are attached to the teeth 63 via, for example, an insulator 64. In this embodiment, the coil 65 is distributed and wound. That is, each coil 65 is wound around the plurality of teeth 63. In this embodiment, the coil 65 is wound in all sections. That is, the circumferential pitch between the slots of the stator 60 into which the coil 65 is inserted is equal to the circumferential pitch of the magnetic poles generated when the three-phase AC power is supplied to the stator 60. The number of poles of the rotary electric machine 1 is, for example, 8. That is, the rotary electric machine 1 is, for example, a rotary electric machine having 8 poles and 48 slots. As described above, in the rotary electric machine 1 of the present embodiment, when the number of poles is N, the number of slots is N × 6.

The rotor 10 can rotate about the central axis J. As shown in FIG. 2, the rotor 10 has a shaft 11, a rotor core 20, and a plurality of magnets 40. The shaft 11 is a columnar shape extending in the axial direction about the central axis J. As shown in FIG. 1, the shaft 11 is rotatably supported around the central axis J by bearings 5a and 5b.

The rotor core 20 is a magnetic material. The rotor core 20 is fixed to the outer peripheral surface of the shaft 11. The rotor core 20 has a through hole 21 that penetrates the rotor core 20 in the axial direction. As shown in FIG. 2, the through hole 21 has a circular shape centered on the central axis J when viewed in the axial direction. A shaft 11 is passed through the through hole 21. The shaft 11 is fixed in the through hole 21 by, for example, press fitting or the like. Although not shown, the rotor core 20 is configured, for example, by laminating a plurality of electrical steel sheets in the axial direction.

The rotor core 20 has a plurality of accommodating holes 30. The plurality of accommodating holes 30 penetrate the rotor core 20 in the axial direction, for example. A plurality of magnets 40 are accommodated inside the plurality of accommodating holes 30. The method of fixing the magnet 40 in the accommodating hole 30 is not particularly limited. The plurality of accommodating holes 30 include a pair of first accommodating holes 31a and 31b and a second accommodating hole 32.

The types of the plurality of magnets 40 are not particularly limited. The magnet 40 may be, for example, a neodymium magnet or a ferrite magnet. The plurality of magnets 40 include a pair of first magnets 41a and 41b and a second magnet 42. The pair of first magnets 41a and 41b and the second magnet 42 form a pole.

In the present embodiment, a pair of first accommodating holes 31a, 31b, a pair of first magnets 41a, 41b, a second accommodating hole 32, and a second magnet 42 are provided at intervals in the circumferential direction. A pair of first accommodating holes 31a, 31b, a pair of first magnets 41a, 41b, a second accommodating hole 32, and a second magnet 42 are provided, for example, eight by eight.

The rotor 10 has a plurality of magnetic pole portions 70 including a pair of first accommodating holes 31a, 31b, a pair of first magnets 41a, 41b, a second accommodating hole 32, and a second magnet 42. For example, eight magnetic pole portions 70 are provided. The plurality of magnetic pole portions 70 are arranged at equal intervals, for example, along the circumferential direction. The plurality of magnetic pole portions 70 include a plurality of magnetic pole portions 70N having an N pole on the outer peripheral surface of the rotor core 20, and a plurality of magnetic pole portions 70S having an S pole on the outer peripheral surface of the rotor core 20. For example, four magnetic pole portions 70N and four magnetic pole portions 70S are provided. The four magnetic pole portions 70N and the four magnetic pole portions 70S are alternately arranged along the circumferential direction. The configuration of each magnetic pole portion 70 is the same except that the magnetic poles on the outer peripheral surface of the rotor core 20 are different and the positions in the circumferential direction are different.

As shown in FIG. 3, in the magnetic pole portion 70, the pair of first accommodating holes 31a and 31b are arranged so as to be spaced apart from each other in the circumferential direction. The first accommodating hole 31a is located, for example, on one side (+ θ side) in the circumferential direction of the first accommodating hole 31b. The first accommodating holes 31a and 31b extend substantially linearly in a direction obliquely inclined with respect to the radial direction, for example, when viewed in the axial direction. The pair of first accommodating holes 31a and 31b extend in a direction away from each other in the circumferential direction from the inner side in the radial direction to the outer side in the radial direction when viewed in the axial direction. That is, the circumferential distance between the first accommodating hole 31a and the first accommodating hole 31b increases from the radial inner side to the radial outer side. The first accommodating hole 31a is located on one side in the circumferential direction, for example, from the inside in the radial direction to the outside in the radial direction. The first accommodating hole 31b is located on the other side (−θ side) in the circumferential direction from the inner side in the radial direction to the outer side in the radial direction, for example. The radial outer ends of the first accommodating holes 31a and 31b are located at the radial outer peripheral edges of the rotor core 20.

The first accommodating hole 31a and the first accommodating hole 31b are arranged, for example, with the magnetic pole center line IL1 shown in FIG. 3 constituting the d-axis sandwiched in the circumferential direction when viewed in the axial direction. The magnetic pole center line IL1 is a virtual line extending in the radial direction through the circumferential center of the magnetic pole portion 70 and the central axis J. The first accommodating hole 31a and the first accommodating hole 31b are arranged line-symmetrically with respect to the magnetic pole center line IL1 when viewed in the axial direction, for example. Hereinafter, with respect to the same configuration as the first accommodating hole 31a except that the magnetic pole center line IL1 is line-symmetrical, the description of the first accommodating hole 31b may be omitted.

The first accommodating hole 31a has a first straight line portion 31c, an inner end portion 31d, and an outer end portion 31e. The first straight line portion 31c extends linearly in the direction in which the first accommodating hole 31a extends when viewed in the axial direction. The first straight line portion 31c is, for example, rectangular when viewed in the axial direction. The inner end portion 31d is connected to the radial inner end portion of the first straight line portion 31c. The inner end portion 31d is a radial inner end portion of the first accommodating hole 31a. The outer end portion 31e is connected to the radial outer end portion of the first straight line portion 31c. The outer end portion 31e is a radial outer end portion of the first accommodating hole 31a. The outer end portion 31e extends radially outward from the radially outer end portion of the first straight line portion 31c along the magnetic pole center line IL1 (details will be described later). The first accommodating hole 31b has a first straight line portion 31f, an inner end portion 31g, and an outer end portion 31h.

The second accommodating hole 32 is located between the radial outer ends of the pair of first accommodating holes 31a and 31b in the circumferential direction. That is, in the present embodiment, the second accommodating hole 32 is located between the outer end portion 31e and the outer end portion 31h in the circumferential direction. The second accommodating hole 32 extends substantially linearly in a direction orthogonal to the radial direction, for example, when viewed in the axial direction. The second accommodating hole 32 extends in a direction orthogonal to the magnetic pole center line IL1 when viewed in the axial direction, for example. The pair of first accommodating holes 31a and 31b and the second accommodating holes 32 are arranged along a ∇ shape, for example, when viewed in the axial direction.

In addition, in the present specification, "a certain object extends in a direction orthogonal to a certain direction" means that a certain object extends in a direction strictly orthogonal to a certain direction. It also includes the case where it extends in a direction substantially orthogonal to a certain direction. The “direction substantially orthogonal to a certain direction” includes, for example, a direction tilted within a range of several degrees [°] with respect to a direction strictly orthogonal to a certain direction due to a tolerance at the time of manufacturing or the like.

When viewed in the axial direction, for example, the magnetic pole center line IL1 passes through the center in the circumferential direction of the second accommodating hole 32. That is, the circumferential position of the circumferential center of the second accommodating hole 32 coincides with, for example, the circumferential position of the circumferential center of the magnetic pole portion 70. The shape seen in the axial direction of the second accommodating hole 32 is, for example, a line-symmetrical shape centered on the magnetic pole center line IL1. The second accommodating hole 32 is located at the radial outer peripheral edge portion of the rotor core 20.

The second accommodating hole 32 has a second straight line portion 32a, one end portion 32b, and the other end portion 32c. The second straight line portion 32a extends linearly in the direction in which the second accommodating hole 32 extends when viewed in the axial direction. The second straight line portion 32a has, for example, a rectangular shape when viewed in the axial direction. The one end portion 32b is connected to the end portion on one side (+ θ side) in the circumferential direction of the second straight line portion 32a. The one end portion 32b is an end portion on one side in the circumferential direction of the second accommodating hole 32. The one end portion 32b is arranged at intervals on the other side (−θ side) in the circumferential direction of the outer end portion 31e in the first accommodating hole 31a. The other end portion 32c is connected to the end portion on the other side (−θ side) in the circumferential direction of the second straight line portion 32a. The other end portion 32c is the end portion on the other side in the circumferential direction of the second accommodating hole 32. The other end portion 32c is arranged at a distance on one side in the circumferential direction of the outer end portion 31h in the first accommodating hole 31b.

The pair of first magnets 41a and 41b are housed inside the pair of first housing holes 31a and 31b, respectively. The first magnet 41a is housed inside the first housing hole 31a. The first magnet 41b is housed inside the first housing hole 31b. The pair of first magnets 41a and 41b are, for example, rectangular when viewed in the axial direction. The length of the pair of first magnets 41a and 41b in the extending direction is the same. The lengths of the first magnets 41a and 41b in the direction orthogonal to the direction in which the pair of first magnets 41a and 41b extend are the same.

Although not shown, the first magnets 41a and 41b are, for example, rectangular parallelepiped. Although not shown, the first magnets 41a and 41b are provided, for example, over the entire axial direction in the first accommodating holes 31a and 31b. The pair of first magnets 41a and 41b are arranged so as to be spaced apart from each other in the circumferential direction. The first magnet 41a is located, for example, on one side (+ θ side) in the circumferential direction of the first magnet 41b.

The first magnet 41a extends along the first accommodating hole 31a when viewed in the axial direction. The first magnet 41b extends along the first accommodating hole 31b when viewed in the axial direction. The first magnets 41a and 41b extend substantially linearly in a direction obliquely inclined with respect to the radial direction, for example, when viewed in the axial direction. The pair of first magnets 41a and 41b extend in a direction away from each other in the circumferential direction from the inner side in the radial direction to the outer side in the radial direction when viewed in the axial direction. That is, the circumferential distance between the first magnet 41a and the first magnet 41b increases from the inside in the radial direction to the outside in the radial direction.

The first magnet 41a is located on one side (+ θ side) in the circumferential direction from the inside in the radial direction to the outside in the radial direction, for example. The first magnet 41b is located on the other side (−θ side) in the circumferential direction from the inner side in the radial direction to the outer side in the radial direction, for example. The first magnet 41a and the first magnet 41b are arranged so as to sandwich the magnetic pole center line IL1 in the circumferential direction, for example, when viewed in the axial direction. The first magnet 41a and the first magnet 41b are arranged line-symmetrically with respect to the magnetic pole center line IL1 when viewed in the axial direction, for example. Hereinafter, the description of the first magnet 41b may be omitted for the same configuration as the first magnet 41a except that it is line-symmetrical with respect to the magnetic pole center line IL1.

The first magnet 41a is fitted in the first accommodation hole 31a. More specifically, the first magnet 41a is fitted in the first straight line portion 31c. Of the side surfaces of the first magnet 41a, both side surfaces in a direction orthogonal to the direction in which the first straight line portion 31c extends are in contact with, for example, the inner side surface of the first straight line portion 31c. In the direction in which the first straight line portion 31c extends in the axial direction, the length of the first magnet 41a is, for example, the same as the length of the first straight line portion 31c.

When viewed in the axial direction, both ends of the first magnet 41a in the stretching direction are arranged apart from both ends of the first accommodating hole 31a in the stretching direction. When viewed in the axial direction, the inner end portion 31d and the outer end portion 31e are arranged adjacent to each other on both sides of the first magnet 41a in the direction in which the first magnet 41a extends. Here, in the present embodiment, the inner end portion 31d constitutes the first flux barrier portion 51a. The outer end portion 31e constitutes the first flux barrier portion 51b. That is, the rotor core 20 has a pair of first flux barrier portions 51a and 51b arranged so as to sandwich the first magnet 41a in the direction in which the first magnet 41a extends when viewed in the axial direction. The rotor core 20 has a pair of first flux barrier portions 51c and 51d arranged so as to sandwich the first magnet 41b in the direction in which the first magnet 41b extends when viewed in the axial direction.

The first flux barrier portion 51b located on the outer side in the radial direction extends outward in the radial direction in parallel with the magnetic pole center line IL1 from the radial end portion of the first magnet 41a. The first flux barrier portion 51d located on the outer side in the radial direction extends outward in the radial direction in parallel with the magnetic pole center line IL1 from the radial end portion of the first magnet 41b.

As described above, the rotor core 20 is arranged in pairs of the first magnets 41a and 41b in the direction in which the first magnets 41a and 41b extend when viewed in the axial direction. , 51c, 51d. The first flux barrier portions 51a, 51b, 51c, 51d and the second flux barrier portions 52a, 52b, which will be described later, are portions that can suppress the flow of magnetic flux. That is, it is difficult for the magnetic flux to pass through each flux barrier portion. Each flux barrier portion is not particularly limited as long as it can suppress the flow of magnetic flux, and may include a void portion or a non-magnetic portion such as a resin portion.

The second magnet 42 is housed inside the second storage hole 32. The second magnet 42 is arranged at a circumferential position between the pair of first magnets 41a and 41b on the radial outer side of the radial inner end portion of the pair of first magnets 41a and 41b. The second magnet 42 extends along the second accommodating hole 32 when viewed in the axial direction. The second magnet 42 extends in a direction orthogonal to the radial direction when viewed in the axial direction. The pair of first magnets 41a and 41b and the second magnet 42 are arranged along a ∇ shape, for example, when viewed in the axial direction.

In the present specification, "the second magnet is arranged at the circumferential position between the pair of first magnets" means that the circumferential position of the second magnet is the circumference between the pair of first magnets. It suffices to be included in the directional position, and the radial position of the second magnet with respect to the first magnet is not particularly limited.

The shape seen in the axial direction of the second magnet 42 is, for example, a shape that is line-symmetrical with respect to the magnetic pole center line IL1. The second magnet 42 has, for example, a rectangular shape when viewed in the axial direction. Seen in the axial direction, the radial length of the second magnet 42 is shorter than the length of the first magnets 41a, 41b in the direction orthogonal to the direction in which the first magnets 41a, 41b extend. By making the length of the second magnet 42 in the radial direction shorter than the length of the first magnets 41a and 41b in the direction orthogonal to the direction in which the first magnets 41a and 41b extend, the weight of the second magnet 42 is reduced. It can be smaller than the weight of the first magnets 41a and 41b. By reducing the weight of the second magnet 42, the centrifugal force of the second magnet 42 during rotation of the rotor 10 can be reduced. Therefore, the load on the rotor core 20 can be reduced.

By making the second magnet 42 thinner, the second magnet 42 can be arranged on the outer side in the radial direction of the rotor core 20. By arranging the second magnet 42 on the outer side in the radial direction of the rotor core 20, it is possible to increase the output of the rotary electric machine 1. Since the magnetism of the second magnet 42 is strengthened by the first magnets 41a and 41b, it is possible to increase the strength of the rotor core 20 and increase the output of the rotary electric machine 1 without impairing the demagnetization strength. Further, a high demagnetization strength can be obtained with a small amount of magnets.

Although not shown, the second magnet 42 has, for example, a rectangular parallelepiped shape. Although not shown, the second magnet 42 is provided, for example, over the entire axial direction in the second accommodating hole 32. The radial inner portion of the second magnet 42 is located, for example, between the circumferential outer ends of the pair of first magnets 41a and 41b. The radial outer portion of the second magnet 42 is located, for example, radially outer than the pair of first magnets 41a and 41b.

The second magnet 42 is fitted in the second accommodating hole 32. More specifically, the second magnet 42 is fitted in the second straight line portion 32a. Of the side surfaces of the second magnet 42, both side surfaces in the radial direction orthogonal to the direction in which the second straight line portion 32a extends are in contact with, for example, the inner side surface of the second straight line portion 32a. In the direction in which the second straight line portion 32a extends in the axial direction, the length of the second magnet 42 is, for example, the same as the length of the second straight line portion 32a.

When viewed in the axial direction, both ends of the second magnet 42 in the stretching direction are arranged apart from both ends of the second accommodating hole 32 in the stretching direction. When viewed in the axial direction, one end portion 32b and the other end portion 32c are arranged adjacent to each other on both sides of the second magnet 42 in the direction in which the second magnet 42 extends. Here, in the present embodiment, one end portion 32b constitutes a second flux barrier portion 52a. The other end portion 32c constitutes a second flux barrier portion 52b. That is, the rotor core 20 has a pair of second flux barrier portions 52a and 52b arranged so as to sandwich the second magnet 42 in the direction in which the second magnet 42 extends when viewed in the axial direction.

The second flux barrier portions 52a and 52b are arcuate inward in the radial direction as they extend from the circumferential end of the second magnet 42 toward the side away from the second magnet 42 in the circumferential direction. When the second flux barrier portions 52a and 52b extend radially outward, the distance between the second flux barrier portions 52a and 52b and the outer peripheral surface of the rotor core 20 becomes short, and the load on the rotor core 20 is applied by the centrifugal force during rotation. It can grow. The load on the rotor core 20 can be reduced by extending the second flux barrier portions 52a and 52b inward in the radial direction. By forming the second flux barrier portions 52a and 52b in an arc shape, the stress concentration at the intersection between the portion extending in the circumferential direction and the portion extending in the radial direction can be relaxed and the load on the rotor core 20 can be further reduced.

The pair of second flux barrier portions 52a and 52b and the second magnet 42 are the first flux barrier portion 51b located on the outer side in the radial direction of the pair of first flux barrier portions 51a and 51b sandwiching the first magnet 41a. It is located between the pair of first flux barrier portions 51c and 51d sandwiching the magnet 41b and the first flux barrier portion 51d located on the outer side in the radial direction in the circumferential direction.

The magnetic poles of the first magnet 41a are arranged along a direction orthogonal to the direction in which the first magnet 41a extends when viewed in the axial direction. The magnetic poles of the first magnet 41b are arranged along a direction orthogonal to the direction in which the first magnet 41b extends when viewed in the axial direction. The magnetic poles of the second magnet 42 are arranged along the radial direction.

Of the magnetic poles of the first magnet 41a, the magnetic poles located on the outer side in the radial direction, the magnetic poles of the magnetic poles of the first magnet 41b located on the outer side in the radial direction, and the magnetic poles of the magnetic poles of the second magnet 42 located on the outer side in the radial direction are They are the same as each other. Of the magnetic poles of the first magnet 41a, the magnetic poles located on the inner side in the radial direction, the magnetic poles of the magnetic poles of the first magnet 41b located on the inner side in the radial direction, and the magnetic poles of the magnetic poles of the second magnet 42 located on the inner side in the radial direction are They are the same as each other.

As shown in FIG. 3, in the magnetic pole portion 70N, the magnetic pole located on the radial outer side of the magnetic poles of the first magnet 41a, the magnetic pole located on the radial outer side of the magnetic poles of the first magnet 41b, and the magnetic pole of the second magnet 42. Of these, the magnetic pole located on the outer side in the radial direction is, for example, an N pole. In the magnetic pole portion 70N, the magnetic pole located in the radial direction of the magnetic poles of the first magnet 41a, the magnetic pole located in the radial direction of the magnetic poles of the first magnet 41b, and the magnetic pole located in the radial direction of the magnetic poles of the second magnet 42. The magnetic pole to be used is, for example, an S pole.

Although not shown, in the magnetic pole portion 70S, the magnetic poles of each magnet 40 are arranged in reverse with respect to the magnetic pole portion 70N. That is, in the magnetic pole portion 70S, the magnetic pole located on the radial outer side of the magnetic poles of the first magnet 41a, the magnetic pole located on the radial outer side of the magnetic poles of the first magnet 41b, and the radial outer side of the magnetic poles of the second magnet 42. The magnetic pole located at is, for example, the S pole. In the magnetic pole portion 70S, the magnetic pole located in the radial direction of the magnetic poles of the first magnet 41a, the magnetic pole located in the radial direction of the magnetic poles of the first magnet 41b, and the magnetic pole located in the radial direction of the magnetic poles of the second magnet 42. The magnetic pole to be used is, for example, an N pole.

In a certain state (hereinafter, simply referred to as "a certain state") in which the circumferential center of the second magnet 42 is arranged at the same circumferential position as the circumferential center of a certain tooth 63, the circumferential center is The teeth 63 arranged at the same circumferential direction as the circumferential center of the second magnet 42 are referred to as teeth 66A. 2 to 3 show an example of the certain state. That is, in a certain state shown in FIGS. 2 to 3, the tooth 66A corresponds to "a certain tooth". In a certain state shown in FIGS. 2 to 3, the magnetic pole center line IL1 passes through the circumferential center of the teeth 66A when viewed in the axial direction. Further, in the present specification, the "certain state" is a state in which "the center position of one of the teeth 66A in the circumferential direction coincides with the magnetic pole center line IL1 which is the d-axis".

In a certain state shown in FIGS. 2 to 3, the teeth 63 adjacent to one side (+ θ side) in the circumferential direction of the teeth 66A are referred to as teeth 66B. The teeth 63 adjacent to the other side (−θ side) in the circumferential direction of the teeth 66A are called the teeth 66C. The teeth 63 adjacent to each other on one side in the circumferential direction of the teeth 66B are called the teeth 66D. The teeth 63 adjacent to the other side in the circumferential direction of the teeth 66C are called the teeth 66E. The teeth 63 adjacent to one side in the circumferential direction of the teeth 66D are called the teeth 66F.

The stator core 61 has a slot 67. As shown in FIG. 3, the slot 67 has a slot 67A located on one side (+ θ side) in the circumferential direction of the teeth 66A, a slot 67B located on the other side (−θ side) in the circumferential direction of the teeth 66A, and the teeth 66B. Slot 67C located on one side in the circumferential direction, slot 67D located on the other side in the circumferential direction of the teeth 66C, slot 67E located on one side in the circumferential direction of the teeth 66D, and located on the other side in the circumferential direction of the teeth 66E. Includes slot 67F.

When viewed in the axial direction, the position in the circumferential direction of the second magnet 42 is in the range of electricity 60 °, which corresponds to the periodic angle of the electric sixth harmonic torque, and electricity 90 °, which corresponds to the electric sixth half cycle. Specifically, when viewed in the axial direction, one end of the second magnet 42 in the circumferential direction is located at the same circumferential position as the circumferential center of one tooth 66A having the circumferential center of the second magnet 42. In a certain state arranged in, at the circumferential center of the teeth 66B arranged one adjacent to one side in the circumferential direction of one teeth 66A and on the same side as the teeth 66B arranged one adjacent to each other. It is located between the circumferential centers of slots 67C arranged two adjacent to each other on one side of one tooth 66A in the circumferential direction. The position of the one-sided end portion of the second magnet 42 in the circumferential direction includes the position of the circumferential center of the teeth 66B and the position of the circumferential center of the slot 67C.

In the case of the rotary electric machine 1 having 8 poles and 48 slots, the position of the end portion in the circumferential direction of the second magnet 42 is 7.5 ° or more and 11.25 ° from the magnetic pole center line (d axis) IL1 as shown in FIG. It is preferably in the range θ1 below °. However, when the position of the end portion in the circumferential direction of the second magnet 42 is 11.25 ° from the magnetic pole center line IL1, the distance between the second magnet 42 and the outer peripheral surface of the rotor core 20 becomes short, and the centrifugal force during rotation causes the distance between the second magnet 42 and the outer peripheral surface of the rotor core 20 to become shorter. The load on the rotor core 20 may increase. Therefore, one end of the second magnet 42 in the circumferential direction is the center of the circumferential direction of the teeth 66B and the umbrella portion 63b on one side of the teeth 66B in the circumferential direction far from the magnetic pole center line (d axis) IL1. It is more preferably between the edges in the circumferential direction. In the case of the rotary electric machine 1 having 8 poles and 48 slots, the position of the end portion on one side in the circumferential direction of the second magnet 42 is in the range θ2 of 7.5 ° or more and 9 ° or less from the magnetic pole center line (d axis) IL1. Is preferable.

The other end of the second magnet 42 in the circumferential direction is the circumferential center of the teeth 66C and the circumferential direction of the umbrella portion 63b on the other side of the teeth 66C in the circumferential direction far from the magnetic pole center line (d axis) IL1. It is more preferable to be between the ends of the magnets. In the case of the rotary electric machine 1 having 8 poles and 48 slots, the position of the end portion of the second magnet 42 on the other side in the circumferential direction shall be in the range of 7.5 ° or more and 9 ° or less from the magnetic pole center line (d axis) IL1. Is preferable. Therefore, it is more preferable that the length of the second magnet 42 in the circumferential direction is 15 ° or more and 18 ° or less with respect to the magnetic pole center line (d axis) IL1.

By setting the length of the second magnet 42 so that the end portion in the circumferential direction is within the above range, the magnetic flux from the second magnet 42 cancels out the magnetic flux from the teeth 63 of the stator 60 while reducing the load on the rotor core 20. It is possible to suppress the generation of harmonic flux during loading and reduce the amplitude of the electromagnetic excitation force of the sixth-order electric angle component that causes noise and vibration. Specifically, as shown in the relationship between the electric angle order and the amplitude of the electromagnetic excitation force in FIG. 5, the amplitude of the electromagnetic excitation force of the electric angle 0th order component contributing to the torque of the rotary electric machine 1 is large. .. On the other hand, it is possible to suppress the amplitude of the electromagnetic excitation force of the fifth-order component and the seventh-order component of the electric field angle under load. By suppressing the amplitude of the electromagnetic excitation force of the electric field angle 5th component and the 7th component under load, the amplitude of the electromagnetic excitation force of the electric angle 6th component can be reduced. Therefore, low vibration and low noise can be realized by suppressing the torque ripple caused by the magnetic flux component of the sixth order of the electric angle.

The magnetic flux flowing between the rotor 10 and the stator 60 does not depend on, for example, the magnetic flux of the first magnets 41a and 41b, but the component of the magnetic flux flowing between the rotor 10 and the stator 60 due to the supply of electric power to the stator 60. May include. This magnetic flux produces so-called reluctance torque. By setting the end of the second magnet 42 in the circumferential direction to have a length within the above range, it is possible to make it difficult to block the magnetic flux in which the reluctance torque is generated, and it is possible to suppress the decrease in the reluctance torque. Therefore, it is possible to prevent the torque of the rotary electric machine 1 from decreasing.

The effect of setting the length of the second magnet 42 in the circumferential direction to be within the above range is that the radial length of the second magnet 42 is orthogonal to the direction in which the first magnets 41a and 41b extend. By assuming that the length is shorter than the length of the first magnets 41a and 41b in the direction and making it thinner, it is realized by suppressing the magnetic flux of the second magnet 42 from becoming too large and causing torque ripple. There is.

Subsequently, the positional relationship between the first flux barrier portion 51b and the second flux barrier portion 52a will be described. The positional relationship between the first flux barrier portion 51d and the second flux barrier portion 52b is the same as the positional relationship between the first flux barrier portion 51b and the second flux barrier portion 52a, and thus description thereof will be omitted.

As shown in FIG. 4, when viewed in the axial direction, the first flux barrier portion 51b includes a first contour portion 81, a second contour portion 82, a third contour portion 83, a fourth contour portion 84, and a fifth. It has a contour portion 85 and. The first contour portion 81 is located on the magnetic pole center line IL1 side in the circumferential direction in the first flux barrier portion 51b and extends linearly in the magnetic pole center line IL1 direction. The second contour portion 82 is located closer to the q-axis IL2 than the magnetic pole center line IL1 in the circumferential direction, and extends linearly in the q-axis IL2 direction. The third contour portion 83 is located between the first contour portion 81 and the second contour portion 82 in the circumferential direction and radially outside the first contour portion 81 and the second contour portion 82, and extends in the circumferential direction. ing. The fourth contour portion 84 has an arc shape connecting the first contour portion 81 and the third contour portion. The fifth contour portion 85 has an arc shape connecting the second contour portion 82 and the third contour portion 83.

The second flux barrier portion 52a when viewed in the axial direction has a sixth contour portion 86, a seventh contour portion 87, and an eighth contour portion 88. The sixth contour portion 86 is located on the q-axis IL2 side in the second flux barrier portion 52a and extends linearly in the radial direction. The seventh contour portion 87 is located radially outside the sixth contour portion 86 and on the d-axis side, and extends in the circumferential direction. The eighth contour portion 88 has an arc shape connecting the sixth contour portion 86 and the seventh contour portion 87. The distance L1 between the intersection 89 of the first contour portion 81 and the fourth contour portion 84 and the intersection 90 of the sixth contour portion 86 and the eighth contour portion 88 is the second contour portion 82 and the fifth contour portion 82. The distance L2 between the intersection 91 with the portion 85 and the q-axis IL2 is the same. The distance L1 between the first flux barrier portion 51b and the second flux barrier portion 52a is the same as the distance L2 between the first flux barrier portion 51b and the q-axis IL2.

By making the distance L1 and the distance L2 the same, it is possible to improve the torque and reduce the torque ripple by balancing the magnetic flux due to the current and the magnetic flux due to the magnet and making the flow of the magnetic flux suitable.

FIG. 6 shows the relationship between the electrical angular order and the amplitude of the electromagnetic excitation force.
It is shown for each relative relationship between the distance L1 between the first flux barrier portion 51b and the second flux barrier portion 52a and the distance L2 between the first flux barrier portion 51b and the q-axis IL2. The first flux barrier portion 51b constituting the above-mentioned distance L1 = distance L2 extends radially outward from the radial end portion of the first magnet 41a in parallel with the magnetic pole center line IL1. As an example, the first flux barrier portion constituting the distance L1> the distance L2 shown in FIG. 6 extends in a direction away from the magnetic pole center line IL1 from the radial end portion of the first magnet 41a toward the outside in the radial direction. .. As an example, the first flux barrier portion constituting the distance L1 <distance L2 shown in FIG. 6 extends in a direction approaching the magnetic pole center line IL1 from the radial end portion of the first magnet 41a toward the outside in the radial direction. ..

As shown in FIG. 6, the amplitude of the electromagnetic excitation force of the electric angle 0th-order component contributing to the torque of the rotary electric machine 1 is larger when the distance L1 = the distance L2 than when there is a difference between the distance L1 and the distance L2. There is no difference. On the other hand, the amplitude of the electromagnetic excitation force of the 6th-order electric angle component and the 12th-order electric angle component, which cause noise and vibration, is the distance L1 = distance as compared with the case where there is a difference between the distance L1 and the distance L2. In the case of L2, it can be significantly reduced. Therefore, by setting the distance L1 = the distance L2, it is possible to realize low vibration and low noise by suppressing the torque ripple caused by the 6th-order electric angle component and the 12th-order electric angle component.

According to the above configuration, the radial length of the second magnet 42 is made shorter and thinner than the length of the first magnets 41a and 41b in the direction orthogonal to the direction in which the first magnets 41a and 41b extend, and the second magnet 42 is made thinner. One end of the circumferential direction of the second magnet 42 is one tooth 66A in a certain state where the circumferential center of the second magnet 42 is arranged at the same circumferential position as the circumferential center of the one tooth 66A. On the same side as the center of the circumferential direction of the teeth 66B arranged one side on one side in the circumferential direction and the teeth 66B arranged one next to each other, two adjacent teeth 66A on one side in the circumferential direction. Since it is located between the center of the slot 67C arranged in the circumferential direction, the electric field angle of the sixth-order component can be increased by suppressing the amplitude of the electromagnetic excitation force of the fifth-order component and the seventh-order component of the electric field angle at the time of loading. Low vibration and low noise can be realized by reducing the amplitude of the electromagnetic excitation force and suppressing the Lucripple.

According to the above configuration, the length of the second magnet 42 in the circumferential direction is 15 ° or more and 18 ° or less with respect to the magnetic pole center line (d axis) IL1 while suppressing a decrease in the strength of the rotor core 20. By reducing the amplitude of the electromagnetic excitation force of the sixth-order electric angle component and suppressing the Lucripple, low vibration and low noise can be realized, and the decrease in reluctance torque is suppressed to reduce the torque of the rotary electric machine 1. It can be suppressed.

According to the above configuration, the distance L1 between the first flux barrier portion 51b and the second flux barrier portion 52a is the same as the distance L2 between the first flux barrier portion 51b and the q-axis IL2, so that the electrical angle is 6th. Low vibration and low noise can be realized by suppressing torque ripple caused by the component and the 12th-order electric angle component.

According to the present embodiment, the rotary electric machine 1 is a three-phase alternating current type rotary electric machine, and the number of slots is N × 6 when the number of poles is N. In such a rotary electric machine 1, the magnetic flux flowing between the rotor 10 and the stator 60 includes an N × 3rd order magnetic flux component and an N × 6th order magnetic flux component. For example, when N = 10, that is, when the rotary electric machine 1 is a rotary electric machine having 10 poles and 60 slots, the magnetic flux flowing between the rotor 10 and the stator 60 is a 10 × 3rd order, that is, a 30th order magnetic flux component. It contains a 10 × 6th order, that is, a 60th order magnetic flux component. In such a case, the torque ripple caused by the N × 6th order magnetic flux component can be reduced by setting the length of the second magnet 42 in the circumferential direction to 15 ° or more and 18 ° or less with respect to the magnetic pole center line IL1. Moreover, it is possible to reduce noise by suppressing the increase in torque ripple caused by the N × 3rd order magnetic flux component. Therefore, by setting the length of the second magnet 42 in the circumferential direction to 15 ° or more and 18 ° or less with respect to the magnetic pole center line IL1, in the rotary electric machine 1 having N poles and N × 6 slots. It is easy to preferably obtain the effect of reducing noise by reducing the torque ripple.

Further, according to the present embodiment, the coil 65 is distributed-wound and all-knot-wound. In the rotary electric machine 1 in which the coil 65 is wound in this way, the magnetic flux flowing between the rotor 10 and the stator 60 includes an N × 3rd order magnetic flux component and an N × 6th order magnetic flux component. In such a case, the torque ripple caused by the N × 6th order magnetic flux component can be reduced by setting the length of the second magnet 42 in the circumferential direction to 15 ° or more and 18 ° or less with respect to the magnetic pole center line IL1. Moreover, it is possible to reduce noise by suppressing the increase in torque ripple caused by the N × 3rd order magnetic flux component. Therefore, by setting the length of the second magnet 42 in the circumferential direction to 15 ° or more and 18 ° or less with respect to the magnetic pole center line IL1, in the rotary electric machine 1 having N poles and N × 6 slots. It is easy to preferably obtain the effect of reducing noise by reducing the torque ripple.

Although the preferred embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an example. The various shapes and combinations of the constituent members shown in the above-mentioned example are examples, and can be variously changed based on design requirements and the like within a range not deviating from the gist of the present invention.

The rotary electric machine to which the present invention is applied is not limited to a motor, but may be a generator. In this case, the rotary electric machine may be a three-phase alternating current generator. The use of the rotary electric machine is not particularly limited. The rotary electric machine may be mounted on a vehicle or may be mounted on a device other than the vehicle, for example. The number of poles and the number of slots of the rotary electric machine are not particularly limited. In the rotary electric machine, the coil may be configured by any winding method. As described above, the configurations described in the present specification can be appropriately combined within a range that does not contradict each other.

In the above embodiment, the radial length of the second magnet 42 is shorter than the length of the first magnets 41a and 41b in the direction orthogonal to the direction in which the first magnets 41a and 41b extend, and the second magnet 42 In a certain state in which the circumferential ends of the second magnet 42 are arranged at the same circumferential position as the circumferential center of the one tooth 66A, the circumferential center of the second magnet 42 is arranged in the same circumferential position as the circumferential center of the one tooth 66A. Two slots arranged next to each other on one side of a certain tooth 66A on the same side as the center of the circumferential direction of the teeth arranged one next to each other and the teeth arranged one adjacent to each other. The explanation is based on the assumption that the position is between the center of the circumferential direction and the center of the circumferential direction, but the present invention is not limited to this configuration. For example, the radial length of the second magnet 42 is shorter than the length of the first magnets 41a, 41b in the direction orthogonal to the direction in which the first magnets 41a, 41b extend, and the first contour portion 81 and the fourth contour portion 81 and the fourth contour. The distance L1 between the intersection 89 with the portion 84 and the intersection 90 between the sixth contour portion 86 and the eighth contour portion 88 is the intersection 91 between the second contour portion 82 and the fifth contour portion 85. The configuration may be based on the premise that the distance L2 from the q-axis IL2 is the same.

That is, the present invention may be the following rotary electric machine. A rotor that can rotate around the central axis and
The stator located on the radial outer side of the rotor and
Equipped with
The rotor is
A rotor core with multiple accommodation holes and
A plurality of magnets housed inside the plurality of housing holes, and
Have,
The stator is
It has an annular core back surrounding the rotor core and a stator core having a plurality of teeth extending radially inward from the core back and arranged side by side at intervals in the circumferential direction.
The teeth have a base extending radially inward from the core back, and umbrella portions provided at the radially inner end of the base and protruding on both sides in the circumferential direction from the base.
The plurality of magnets
A pair of first magnets that are arranged at intervals in the circumferential direction and extend in the direction away from each other in the circumferential direction from the inside in the radial direction to the outside in the radial direction when viewed in the axial direction.
A second that is arranged at a circumferential position between the pair of first magnets on the radial outer side of the radial inner end of the pair of first magnets and extends in a direction orthogonal to the radial direction when viewed in the axial direction. With a magnet
Including
When viewed in the axial direction, the radial length of the second magnet is shorter than the length of the first magnet in the direction orthogonal to the direction in which the first magnet extends.
The rotor core has a pair of first flux barrier portions arranged so as to sandwich each of the first magnets in a direction in which the first magnets extend in the axial direction.
A pair of second flux barrier portions arranged so as to sandwich the second magnet in the direction in which the second magnet extends when viewed in the axial direction.
Have,
The first flux barrier portion located on the radial outer side of the pair of the first flux barrier portions extends radially outward from the radial end portion of the first magnet in parallel with the d-axis.
The first flux barrier portion located on the outer side in the radial direction when viewed in the axial direction is
The first contour portion located on the d-axis side in the circumferential direction and extending linearly in the d-axis direction,
A second contour portion that is located closer to the q-axis side than the d-axis in the circumferential direction and extends linearly in the q-axis direction.
A third contour portion located between the first contour portion and the second contour portion in the circumferential direction and radially outside the first contour portion and the second contour portion and extending in the circumferential direction.
An arcuate fourth contour portion connecting the first contour portion and the third contour portion,
An arcuate fifth contour portion connecting the second contour portion and the third contour portion,
Have,
The second flux barrier portion adjacent to the first flux barrier portion located on the outer side in the radial direction in the circumferential direction is
The sixth contour portion located on the q-axis side and extending linearly in the radial direction,
A seventh contour portion that is radially outside the sixth contour portion and is located on the d-axis side and extends in the circumferential direction.
An arcuate eighth contour portion connecting the sixth contour portion and the seventh contour portion,
Have,
The distance between the intersection of the first contour portion and the fourth contour portion and the intersection of the sixth contour portion and the eighth contour portion is the distance between the second contour portion and the fifth contour portion. A rotary electric machine having the same distance between the intersection and the q-axis.

1 ... rotary electric machine, 10 ... rotor, 20 ... rotor core, 30 ... accommodation hole, 40 ... magnet, 41a, 41b ... first magnet, 42 ... second magnet, 51a, 51b, 51c, 51d ... first flux barrier part, 52a, 52b ... 2nd flux barrier, 60 ... stator, 61 ... stator core, 62 ... core back, 63, 66A, 66B, 66C, 66D, 66E ... teeth, 65 ... coil, 67 ... slot, 70, 70N, 70S ... Magnetic pole, 81 ... 1st contour, 82 ... 2nd contour, 83 ... 3rd contour, 84 ... 4th contour, 85 ... 5th contour, 86 ... 6th contour, 87 ... 7th Contour part, 88 ... 8th contour part, 89, 90, 91 ... intersection, IL1 ... magnetic pole center line (d axis), IL2 ... q axis, J ... center axis

Claims (4)

1. A rotor that can rotate around the central axis and
   The stator located on the radial outer side of the rotor and
   Equipped with
   The rotor is
   A rotor core with multiple accommodation holes and
   A plurality of magnets housed inside the plurality of housing holes, and
   Have,
   The stator is
   It has an annular core back surrounding the rotor core and a stator core having a plurality of teeth extending radially inward from the core back and arranged side by side at intervals in the circumferential direction.
   The teeth have a base extending radially inward from the core back, and umbrella portions provided at the radially inner end of the base and protruding on both sides in the circumferential direction from the base.
   The plurality of magnets
   A pair of first magnets that are arranged at intervals in the circumferential direction and extend in the direction away from each other in the circumferential direction from the inside in the radial direction to the outside in the radial direction when viewed in the axial direction.
   A second that is arranged at a circumferential position between the pair of first magnets on the radial outer side of the radial inner end of the pair of first magnets and extends in a direction orthogonal to the radial direction when viewed in the axial direction. With a magnet
   Including
   When viewed in the axial direction, the radial length of the second magnet is shorter than the length of the first magnet in the direction orthogonal to the direction in which the first magnet extends.
   When viewed in the axial direction, both ends in the circumferential direction of the second magnet are arranged in a certain state in which the circumferential center of the second magnet is arranged at the same circumferential position as the circumferential center of a certain tooth. , On the same side as the circumferential center of the tooth placed next to one of the teeth and on the same side as the tooth placed next to the tooth, two of the teeth placed next to the tooth. A rotating electric machine located between the center of the slot in the circumferential direction.
2. When viewed in the axial direction, both ends in the circumferential direction of the second magnet are arranged in a certain state in which the circumferential center of the second magnet is arranged at the same circumferential position as the circumferential center of a certain tooth. , A position closer to the circumferential center of the second magnet than the circumferential position of the end portion far from the circumferential center of the second magnet in the circumferential direction of the umbrella portion in the teeth arranged next to the one. It is in,
   The rotary electric machine according to claim 1.
3. The rotor core has a pair of first flux barrier portions arranged so as to sandwich each of the first magnets in a direction in which the first magnets extend in the axial direction.
   A pair of second flux barrier portions arranged so as to sandwich the second magnet in the direction in which the second magnet extends when viewed in the axial direction.
   Have,
   The second flux barrier portion has an arc shape that extends inward in the radial direction as it extends in the circumferential direction from the circumferential end portion of the second magnet.
   The rotary electric machine according to claim 1 or 2.
4. The first flux barrier portion located on the radial outer side of the pair of the first flux barrier portions extends radially outward from the radial end portion of the first magnet in parallel with the d-axis.
   The first flux barrier portion located on the outer side in the radial direction when viewed in the axial direction is
   The first contour portion located on the d-axis side in the circumferential direction and extending linearly in the d-axis direction,
   A second contour portion located closer to the q-axis than the d-axis in the circumferential direction and extending linearly in the q-axis direction.
   A third contour portion located between the first contour portion and the second contour portion in the circumferential direction and radially outside the first contour portion and the second contour portion and extending in the circumferential direction.
   An arcuate fourth contour portion connecting the first contour portion and the third contour portion,
   An arcuate fifth contour portion connecting the second contour portion and the third contour portion,
   Have,
   The second flux barrier portion adjacent to the first flux barrier portion located on the outer side in the radial direction in the circumferential direction is
   The sixth contour portion located on the q-axis side and extending linearly in the radial direction,
   A seventh contour portion that is radially outside the sixth contour portion and is located on the d-axis side and extends in the circumferential direction.
   An arcuate eighth contour portion connecting the sixth contour portion and the seventh contour portion,
   Have,
   The distance between the intersection of the first contour portion and the fourth contour portion and the intersection of the sixth contour portion and the eighth contour portion is the distance between the second contour portion and the fifth contour portion. The distance between the intersection and the q-axis is the same,
   The rotary electric machine according to claim 3.

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