Rotary electric machine and drive device

Abstract

To provide a rotary electric machine with a structure capable of suppressing vibration of a rotor.SOLUTION: A pair of first flux barrier portions 21a and 21b is connected to respective ends of a pair of first magnet housing portions 51a, the respective ends being located at the external side in the radial direction in both ends in the first direction. A pair of second flux barrier portions 22a is connected to a second magnet housing portion 52, and is located between the pair of first flux barrier portions in the circumferential direction. The minimum gap in gaps between, in the circumferential direction, the first flux barrier portion and the second flux barrier portion which hold therebetween a part of a rotor core 30 in the circumferential direction is smaller than the minimum dimension of a teeth portion 66 in the circumferential direction, and is larger than the dimension in the circumferential direction at the end of a slot portion at the internal side in the radial direction. A first edge portion, provided at an edge on a side where the second flux barrier portion is located in the edge of the first flux barrier portion in the circumferential direction is located closer to the side where the second flux barrier portion is located in the circumferential direction as it moves outward in the radial direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a rotating electric machine and a drive device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a rotating electric machine is known that includes a pair of permanent magnets arranged in a V shape and a central magnet arranged on the outer periphery of the permanent magnets (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-208805 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the rotating electric machine as described above, there is a risk that torque ripple increases due to the magnetic flux flowing between the rotor and the stator including higher-order magnetic flux components, and this increases vibration of the rotor.

[0005] In view of the above circumstances, an object of the present invention is to provide a rotating electric machine and a drive unit having a structure capable of suppressing vibration of a rotor. [Means for solving the problem]

[0006] One aspect of the rotating electric machine of the present invention includes a rotor rotatable about a central axis and a stator positioned radially outward of the rotor. The rotor includes a rotor core and a plurality of magnets held by the rotor core. The stator includes a core back portion surrounding the rotor, a plurality of teeth extending radially inward from the core back portion and arranged at intervals in the circumferential direction, and a plurality of slots provided between adjacent teeth portions in the circumferential direction. The rotor core includes a magnet holding portion that holds three or more of the magnets. The magnet holding portion includes a pair of first magnet housing portions arranged at intervals from each other in the circumferential direction, a second magnet housing portion positioned radially outward of the pair of first magnet housing portions, a pair of first flux barrier portions, and a pair of second flux barrier portions. The plurality of magnets include a pair of first magnets respectively positioned in the pair of first magnet housing portions and a second magnet positioned in the second magnet housing portion. The pair of first magnet accommodating portions extend along a first direction in which they move away from each other in the circumferential direction from the radially inner side toward the radially outer side as viewed in the axial direction. The pair of first flux barrier portions are connected to ends located on the radially outer side of both ends of the pair of first magnet accommodating portions in the first direction, respectively. The pair of second flux barrier portions are connected to the second magnet accommodating portion and are located between the pair of first flux barrier portions in the circumferential direction. Each of the pair of second flux barrier portions is disposed to sandwich a part of the rotor core between the pair of first flux barrier portions in the circumferential direction. A minimum circumferential distance between the first flux barrier portion and the second flux barrier portion that sandwich a part of the rotor core in the circumferential direction is smaller than a minimum circumferential dimension of the teeth portion and is larger than a circumferential dimension of a radially inner end of the slot portion. A circumferential edge portion of the first flux barrier portion on a side where the second flux barrier portion is located has a first edge portion. The first edge portion is positioned on the side in the circumferential direction where the second flux barrier portion is positioned as it moves radially outward.

[0007] One aspect of a drive device of the present invention includes the rotating electric machine described above, and a gear mechanism connected to the rotating electric machine. Effect of the Invention

[0008] According to one aspect of the present invention, it is possible to suppress vibration of the rotor in a rotating electric machine and a drive device. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing a drive device according to a first embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing the rotating electric machine according to the first embodiment, taken along line II-II in FIG. [Diagram 3] FIG. 3 is a cross-sectional view showing a part of the rotating electric machine according to the first embodiment, and is a partially enlarged view showing a part of FIG. [Figure 4] FIG. 4 is a cross-sectional view showing a part of the rotating electric machine according to the first embodiment, and is a partially enlarged view showing a part of FIG. [Diagram 5] FIG. 5 is a cross-sectional view showing a part of the rotating electric machine in the first embodiment, and is a partially enlarged view showing another part of FIG. [Figure 6] FIG. 6 is a cross-sectional view showing a part of a rotor in the second embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing a part of a rotor according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z axis direction is the up-down direction. The side where the Z axis arrow points (+Z side) is the upper side, and the opposite side to the side where the Z axis arrow points (-Z side) is the lower side. The X axis direction is a direction perpendicular to the Z axis direction, and is the front-rear direction of a vehicle in which a drive device in the following embodiments is mounted. In the following embodiments, the side where the X axis arrow points (+X side) is the front side of the vehicle, and the opposite side to the side where the X axis arrow points (-X side) is the rear side of the vehicle. The Y axis direction is a direction perpendicular to both the X axis direction and the Z axis direction, and is the left-right direction of the vehicle, that is, the vehicle width direction. In the following embodiments, the side where the Y axis arrow points (+Y side) is the left side of the vehicle, and the opposite side to the side where the Y axis arrow points (-Y side) is the right side of the vehicle.

[0011] The positional relationship in the front-rear direction is not limited to that in the following embodiment, and the +X side may be the rear side of the vehicle, and the -X side may be the front side of the vehicle. In this case, the +Y side is the right side of the vehicle, and the -Y side is the left side of the vehicle. In this specification, the "parallel direction" includes a substantially parallel direction, and the "orthogonal direction" includes a substantially orthogonal direction.

[0012] The central axis J shown in the drawings as appropriate is a virtual axis extending in a direction intersecting the up-down direction. More specifically, the central axis J extends in the Y-axis direction perpendicular to the up-down direction, that is, in the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply called the "axial direction", the radial direction centered on the central axis J is simply called the "radial direction", and the circumferential direction centered on the central axis J, that is, around the axis of the central axis J, is called the "circumferential direction". The circumferential direction is indicated by an arrow θ in the drawings as appropriate. In the following description, the left side (+Y side) of the axial direction is called the "one axial side", and the right side (-Y side) of the axial direction is called the "other axial side". The up-down direction is, for example, a vertical direction, and the front-rear direction and the left-right direction (axial direction) are, for example, horizontal directions perpendicular to the vertical direction.

[0013] First Embodiment A drive device 100 according to the present embodiment shown in Fig. 1 is a drive device mounted on a vehicle and rotates an axle 73. The vehicle on which the drive device 100 is mounted is a vehicle that uses a motor as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), or an electric vehicle (EV). As shown in Fig. 1, the drive device 100 includes a rotating electric machine 60, a gear mechanism 70 connected to the rotating electric machine 60, a housing 80 that accommodates the rotating electric machine 60 and the gear mechanism 70 therein, and a control device 83 that controls the rotating electric machine 60. In this embodiment, the rotating electric machine 60 is a motor.

[0014] The housing 80 has a motor housing 81 that houses the rotating electric machine 60 therein, and a gear housing 82 that houses the gear mechanism 70. In this embodiment, oil O is contained inside the motor housing 81 and the gear housing 82.

[0015] The gear mechanism 70 transmits the rotation of the rotating electric machine 60 to an axle 73 of the vehicle. The gear mechanism 70 has a reduction gear 71 connected to the rotating electric machine 60, and a differential gear 72 connected to the reduction gear 71. The differential gear 72 is connected to the axle 73.

[0016] The rotating electric machine 60 includes a rotor 10 rotatable about a central axis J, and a stator 61 facing the rotor 10 with a gap therebetween. The stator 61 is located radially outward of the rotor 10. The stator 61 includes a stator core 62 and a plurality of coils 63 attached to the stator core 62. The stator core 62 is, for example, a spiral core formed of a plate member extending in a spiral shape around the central axis J1. The plate member is, for example, an electromagnetic steel plate. The stator core 62 may be formed by stacking a plurality of plate members, such as electromagnetic steel plates, in the axial direction.

[0017] As shown in FIG. 2, the stator core 62 has a core back portion 64 surrounding the rotor 10, and a plurality of teeth portions 65 extending radially inward from the core back portion 64. That is, the stator 61 has the core back portion 64 and the plurality of teeth portions 65. In this embodiment, the core back portion 64 is annular about the central axis J. The plurality of teeth portions 65 are arranged at intervals in the circumferential direction. The plurality of teeth portions 65 are arranged at equal intervals around one circumferential circumference. As shown in FIG. 3, a plurality of coils 63 are attached to each of the plurality of teeth portions 65. The teeth portion 65 has a teeth main body portion 66 and an umbrella portion 67.

[0018] The tooth main body portion 66 extends radially inward from the core back portion 64. In this embodiment, the tooth main body portion 66 extends linearly in the radial direction. The circumferential dimension of the tooth main body portion 66 decreases toward the radially inward direction. In this embodiment, the circumferential dimension at the radially inner end of the tooth main body portion 66 is the smallest circumferential dimension of the tooth portion 65. Each coil 63 is wound and attached to each tooth main body portion 66.

[0019] 4, the umbrella portion 67 is connected to a radially inner end of the tooth main body portion 66. The umbrella portion 67 protrudes on both circumferential sides beyond the radially inner end of the tooth main body portion 66. The circumferential dimension of the umbrella portion 67 is greater than the circumferential dimension of the tooth main body portion 66. The umbrella portion 67 protrudes on both circumferential sides beyond the radially inner end of the tooth main body portion 66.

[0020] 3, the stator 61 has a plurality of slots 68 each provided between circumferentially adjacent teeth 65. A portion of the coil 63 attached to the teeth 65 is located inside the slot 68. More specifically, a portion of the coil 63 attached to each of the circumferentially adjacent teeth 65 is located inside one slot 68. The circumferential dimension of the slot 68 corresponds to the circumferential distance between the circumferentially adjacent teeth 65.

[0021] The slot portion 68 has a portion provided between the tooth main body portions 66 of the circumferentially adjacent tooth portions 65 and a portion provided between the umbrella portions 67 of the circumferentially adjacent tooth portions 65. The circumferential dimension of the portion of the slot portion 68 provided between the circumferentially adjacent tooth main body portions 66 is substantially the same over the entire radial direction. The circumferential dimension of the portion of the slot portion 68 provided between the circumferentially adjacent umbrella portions 67 is smaller than the circumferential dimension of the portion of the slot portion 68 provided between the circumferentially adjacent tooth main body portions 66. In this embodiment, the portion of the slot portion 68 provided between the circumferentially adjacent umbrella portions 67 is the radially inner end of the slot portion 68. In this embodiment, the circumferential dimension of the radially inner end of the slot portion 68 is the smallest circumferential dimension of the slot portion 68.

[0022] As shown in Fig. 2, the rotor 10 has a shaft 20, a rotor core 30, and a plurality of magnets 40 held by the rotor core 30. As shown in Fig. 1, the shaft 20 extends in the axial direction about a central axis J. A reduction gear 71 is connected to an end of the shaft 20 on one axial side (+Y side).

[0023] The rotor core 30 is fixed to the outer peripheral surface of the shaft 20. As shown in FIG. 2, the rotor core 30 is generally cylindrical and centered on the central axis J. The rotor core 30 has a central hole 32 that penetrates the rotor core 30 in the axial direction. When viewed in the axial direction, the central hole 32 is circular and centered on the central axis J. The shaft 20 passes through the central hole 32 in the axial direction. The inner peripheral surface of the central hole 32 is fixed to the outer peripheral surface of the shaft 20.

[0024] The rotor core 30 is made of a magnetic material. Although not shown in the drawings, the rotor core 30 is configured by stacking a plurality of plate members in the axial direction. The plurality of plate members that configure the rotor core 30 are, for example, electromagnetic steel plates. As shown in FIG. 1, the rotor core 30 is configured by connecting a plurality of core piece parts 36 that are lined up in the axial direction, for example. Each of the core piece parts 36 is configured by stacking a plurality of plate members, such as electromagnetic steel plates, in the axial direction.

[0025] As shown in FIG. 2, the rotor core 30 has a magnet holding portion 31. The magnet holding portion 31 is provided on the radially outer portion of the rotor core 30. In this embodiment, a plurality of magnet holding portions 31 are provided lined up in the circumferential direction. The plurality of magnet holding portions 31 are arranged at equal intervals around one circumferential circumference. In this embodiment, the plurality of magnet holding portions 31 lined up in the circumferential direction are provided for each core piece portion 36 constituting the rotor core 30. Eight magnet holding portions 31 are provided for each core piece portion 36.

[0026] The magnet holding portion 31 holds three or more magnets 40. In this embodiment, the magnet holding portion 31 holds three magnets 40, including a pair of first magnets 41a, 41b and one second magnet 42. One magnet holding portion 31 and the three magnets 40 held by one magnet holding portion 31 constitute a magnetic pole portion 10P. A plurality of magnetic pole portions 10P are arranged in a circumferential direction. The plurality of magnetic pole portions 10P are arranged at equal intervals around one circumference in the circumferential direction. In this embodiment, the plurality of magnetic pole portions 10P arranged in a circumferential direction are provided for each core piece portion 36 constituting the rotor core 30. Eight magnetic pole portions 10P are provided for each core piece portion 36. The circumferential positions of the magnetic pole portions 10P in the core piece portions 36 adjacent to each other in the axial direction are, for example, shifted from each other. Note that the circumferential positions of the magnetic pole portions 10P in the core piece portions 36 adjacent to each other in the axial direction may be the same as each other.

[0027] The multiple magnetic pole portions 10P include multiple magnetic pole portions 10N having N poles on the outer peripheral surface of rotor core 30 and multiple magnetic pole portions 10S having S poles on the outer peripheral surface of rotor core 30. In this embodiment, four each of the magnetic pole portions 10N and magnetic pole portions 10S are provided. The four magnetic pole portions 10N and the four magnetic pole portions 10S are alternately arranged in the circumferential direction.

[0028] 3, the magnet holding portion 31 in each magnetic pole portion 10P includes a pair of first magnet accommodating portions 51a, 51b, a second magnet accommodating portion 52, a pair of first flux barrier portions 21a, 21b, a pair of second flux barrier portions 22a, 22b, and a pair of third flux barrier portions 23a, 23b. In this embodiment, the pair of first magnet accommodating portions 51a, 51b, the second magnet accommodating portion 52, the pair of first flux barrier portions 21a, 21b, and the pair of second flux barrier portions 22a, 22b are each formed by providing a hole portion penetrating the core piece portion 36 in the axial direction.

[0029] A pair of first magnet housing parts 51a, 51b are arranged at an interval from each other in the circumferential direction. In each magnetic pole part 10P, the first magnet housing part 51a and the first magnet housing part 51b are arranged to sandwich the magnetic pole center line Ld in the circumferential direction. The magnetic pole center line Ld is a virtual line that passes through the circumferential center of the magnetic pole part 10P and extends in the radial direction. The magnetic pole center line Ld passes through the central axis line J when viewed in the axial direction. In this embodiment, the circumferential center of the magnetic pole part 10P is at the same position in the circumferential direction as the circumferential center of the magnet holding part 31. The magnetic pole center line Ld passes through the circumferential center of the magnet holding part 31 when viewed in the axial direction. The magnetic pole center line Ld is provided for each magnetic pole part 10P. The magnetic pole center line Ld passes through the d-axis of the rotor 10 when viewed in the axial direction. The direction in which the magnetic pole center line Ld extends is the d-axis direction of the rotor 10.

[0030] In the following description, in each magnetic pole portion 10P, the side approaching the magnetic pole center line Ld in the circumferential direction is referred to as the "circumferential inner side," and the side moving away from the magnetic pole center line Ld in the circumferential direction is referred to as the "circumferential outer side." In a portion of each magnetic pole portion 10P located on the side toward which the arrow θ points (+θ side) from the magnetic pole center line Ld, the side toward which the arrow θ points is the circumferential outer side, and the opposite side to the side toward which the arrow θ points (-θ side) is the circumferential inner side. In a portion of each magnetic pole portion 10P located on the opposite side to the side toward which the arrow θ points from the magnetic pole center line Ld, the side toward which the arrow θ points is the circumferential inner side, and the opposite side to the side toward which the arrow θ points is the circumferential outer side.

[0031] The pair of first magnet housing parts 51a, 51b extend in a direction away from each other in the circumferential direction from the radially inner side toward the radially outer side as viewed in the axial direction. That is, the circumferential distance between the first magnet housing part 51a and the first magnet housing part 51b increases from the radially inner side toward the radially outer side as viewed in the axial direction. The pair of first magnet housing parts 51a, 51b are arranged along a V-shape that expands in the circumferential direction toward the radially outer side as viewed in the axial direction. In this embodiment, the pair of first magnet housing parts 51a, 51b are substantially rectangular as viewed in the axial direction. The first magnet housing part 51a and the first magnet housing part 51b are arranged in line symmetry with each other with the magnetic pole center line Ld as the axis of symmetry as viewed in the axial direction. In the following description, the description of the first magnet housing part 51b may be omitted.

[0032] The direction in which the first magnet housing portion 51a extends when viewed in the axial direction is called the "first direction D1a", and the direction in which the first magnet housing portion 51b extends when viewed in the axial direction is called the "first direction D1b". The first directions D1a and D1b are perpendicular to the axial direction and inclined obliquely in the circumferential direction with respect to the radial direction. The first directions D1a and D1b are directions located on the circumferential outside as they move radially outward. The first directions D1a and D1b are appropriately indicated by arrows in the figure. The arrows indicating the first directions D1a and D1b point radially outward and circumferentially outward. The side of the first directions D1a and D1b toward which the arrows point (+D1a side, +D1b side) is called the "first direction outer side", and the opposite side of the first directions D1a and D1b toward which the arrows point (-D1a side, -D1b side) is called the "first direction inner side".

[0033] The direction perpendicular to both the first direction D1a and the axial direction is called the "second direction D2a", and the direction perpendicular to both the first direction D1b and the axial direction is called the "second direction D2b". The second directions D2a and D2b are directions that are located radially inward as they move outward in the circumferential direction. The second directions D2a and D2b are appropriately indicated by arrows in the figures. The arrows indicating the second directions D2a and D2b point outward in the circumferential direction and inward in the radial direction. The side of the second directions D2a and D2b toward which the arrows point (+D2a side, +D2b side) is called the "second direction outer side", and the side of the second directions D2a and D2b opposite to the side toward which the arrows point (-D2a side, -D2b side) is called the "second direction inner side".

[0034] In this specification, "the direction in which the magnet accommodating portion extends when viewed in the axial direction" refers to the direction in which the long side of the substantially rectangular magnet accommodating portion extends when the magnet accommodating portion is substantially rectangular when viewed in the axial direction, such as the first magnet accommodating portions 51a and 51b in this embodiment. In other words, in this embodiment, "the direction in which the first magnet accommodating portion 51a extends when viewed in the axial direction" refers to the direction in which the long side of the substantially rectangular first magnet accommodating portion 51a extends when viewed in the axial direction.

[0035] A pair of first magnets 41a, 41b are located in the pair of first magnet housing parts 51a, 51b, respectively. Each of the first magnets 41a, 41b is fixed in each of the first magnet housing parts 51a, 51b. The method of fixing each of the first magnets 41a, 41b in each of the first magnet housing parts 51a, 51b is not particularly limited. Each of the first magnets 41a, 41b may be fixed in each of the first magnet housing parts 51a, 51b by crimping a part of the rotor core 30. Each of the first magnets 41a, 41b may be fixed in each of the first magnet housing parts 51a, 51b by a resin filled in a part of each of the first magnet housing parts 51a, 51b other than the part where the first magnets 41a, 41b are arranged. Each first magnet 41a, 41b may be fixed within each first magnet accommodating portion 51a, 51b by a foam sheet placed in a portion of each first magnet accommodating portion 51a, 51b other than the portion where the first magnet 41a, 41b is placed.

[0036] The type of the pair of first magnets 41a, 41b is not particularly limited. The pair of first magnets 41a, 41b may be, for example, neodymium magnets or ferrite magnets. The first magnets 41a, 41b are, for example, substantially rectangular parallelepiped. The first magnets 41a, 41b extend, for example, from one axial end of the core piece part 36 to the other axial end.

[0037] The pair of first magnets 41a, 41b are arranged along a V-shape that expands in the circumferential direction as it goes radially outward when viewed in the axial direction. That is, the pair of first magnets 41a, 41b extend in first directions D1a, D1b that move away from each other in the circumferential direction as they go from the radially inner side to the radially outer side when viewed in the axial direction. The pair of first magnets 41a, 41b are substantially rectangular in shape extending in the first directions D1a, D1b when viewed in the axial direction.

[0038] The pair of first magnets 41a, 41b are arranged on either side of the magnetic pole center line Ld, i.e., the circumferential center of the magnetic pole portion 10P, in the circumferential direction. The first magnets 41a and 41b are arranged line-symmetrically with each other with the magnetic pole center line Ld as the axis of symmetry when viewed in the axial direction. In the following description, the description of the first magnet 41b may be omitted.

[0039] The first magnet 41a has an N pole and an S pole along the second direction D2a. In the magnetic pole portion 10N, the first magnet 41a has an N pole on the inside in the second direction (-D2a side) and an S pole on the outside in the second direction (+D2a side). In the magnetic pole portion 10S, the first magnet 41a has an S pole on the inside in the second direction and an N pole on the outside in the second direction.

[0040] As shown in FIG. 5, the first magnet 41a has a first surface 44a, a second surface 44b, and a corner portion 43. The first surface 44a faces the second direction D2a perpendicular to both the first direction D1a and the axial direction. The first surface 44a is perpendicular to the second direction D2a. In this embodiment, the first surface 44a faces the second direction inward (-D2a side). The second surface 44b is a surface located on the radially inner side of the surface facing the first direction D1a. The second surface 44b faces the first direction inward (-D1a side). The second surface 44b is a surface perpendicular to the first direction D1a. The end of the second surface 44b on the inner side in the second direction is connected to the end of the first surface 44a on the inner side in the first direction. The corner portion 43 is a corner portion where the first surface 44a and the second surface 44b are connected to each other. Of the four corners of the first magnet 41a, which has a substantially rectangular shape when viewed in the axial direction, the corner 43 is a corner that is located on the inner side in the first direction and on the inner side in the second direction.

[0041] As shown in FIG. 4, the first magnet 41a has a third surface 44c and a corner portion 45. The third surface 44c is a surface located on the radially outer side of the surface facing the first direction D1a. The third surface 44c faces the outer side in the first direction (+D1a side). The third surface 44c is a surface perpendicular to the first direction D1a. An end portion of the third surface 44c on the inner side in the second direction (-D2a side) is connected to an end portion of the first surface 44a on the outer side in the first direction. The corner portion 45 is a corner portion where the first surface 44a and the third surface 44c are connected to each other. The corner portion 45 is a corner portion located on the outer side in the first direction and on the inner side in the second direction among the four corner portions of the first magnet 41a having a substantially rectangular shape when viewed in the axial direction.

[0042] As shown in FIG. 3, the first magnet housing portion 51a has a pair of support portions 53a, 53b that support the first magnet 41a in the first direction D1a. The pair of support portions 53a, 53b support the first magnet 41a by sandwiching it in the first direction D1a. The pair of support portions 53a, 53b position the first magnet 41a in the first direction D1a within the first magnet housing portion 51a. The support portion 53a is a portion of the edge portion of the first magnet housing portion 51a on the outer side in the first direction (+D1a side) on the outer side in the second direction (+D2a side). The support portion 53b is a portion of the edge portion of the first magnet housing portion 51a on the inner side in the first direction (-D1a side) on the outer side in the second direction.

[0043] In the first magnet housing portion 51a, the first magnet 41a is in contact with a surface of the inner surface of the first magnet housing portion 51a that is located on the inside in the second direction (-D2a side). As a result, the first magnet 41a is positioned in the second direction D2a in the first magnet housing portion 51a. A gap is provided between the surface of the inner surface of the first magnet housing portion 51a that is located on the outside in the second direction (+D2a side) and the first magnet 41a in the second direction D2a. For example, a resin or foam sheet that fixes the first magnet 41a in the first magnet housing portion 51a may be provided in the gap.

[0044] The second magnet housing portion 52 is located radially outside the pair of first magnet housing portions 51a, 51b. The second magnet housing portion 52 is provided on the radial outer edge portion of the rotor core 30. In this embodiment, the second magnet housing portion 52 extends in a direction perpendicular to the radial direction passing through the circumferential center of the magnet holding portion 31 when viewed in the axial direction. The second magnet housing portion 52 has a substantially rectangular shape extending linearly in a direction perpendicular to the magnetic pole center line Ld when viewed in the axial direction. The second magnet housing portion 52 is located between the pair of first flux barrier portions 21a, 21b in the circumferential direction. The second magnet housing portion 52 is disposed at a position overlapping the magnetic pole center line Ld when viewed in the axial direction. In this embodiment, the second magnet housing portion 52 has a shape that is line-symmetrical with the magnetic pole center line Ld as an axis of symmetry when viewed in the axial direction.

[0045] The second magnet 42 is located in the second magnet housing portion 52. The second magnet 42 is fixed in the second magnet housing portion 52. The method of fixing the second magnet 42 in the second magnet housing portion 52 is not particularly limited. For example, the method of fixing the second magnet 42 in the second magnet housing portion 52 may be the same as the method exemplified as the method of fixing the first magnets 41a, 41b in the first magnet housing portions 51a, 51b. The type of the second magnet 42 is not particularly limited. The second magnet 42 may be, for example, a neodymium magnet or a ferrite magnet. The second magnet 42 is, for example, substantially rectangular. The second magnet 42 extends, for example, from one axial end of the core piece portion 36 to the other axial end.

[0046] The second magnet 42 has a generally rectangular shape extending in a direction perpendicular to the magnetic pole center line Ld when viewed in the axial direction. In this embodiment, the radial dimension of the second magnet 42 is the same as the dimensions of the pair of first magnets 41a, 41b in the second direction D2a, D2b. The radial dimension of the second magnet 42 may be different from the dimensions of the pair of first magnets 41a, 41b in the second direction D2a, D2b.

[0047] The second magnet 42 has an N pole and an S pole along the radial direction. In the magnetic pole portion 10N, the second magnet 42 has an N pole on the radially outer side and an S pole on the radially inner side. In the magnetic pole portion 10S, the second magnet 42 has an S pole on the radially outer side and an N pole on the radially inner side.

[0048] In each magnetic pole portion 10P, the pair of first magnet housing portions 51a, 51b and the one second magnet housing portion 52 are arranged along a V shape when viewed in the axial direction. In each magnetic pole portion 10P, the pair of first magnets 41a, 41b and the one second magnet 42 are arranged along a V shape when viewed in the axial direction. In each magnetic pole portion 10P, the three magnets 40 are arranged along a V shape when viewed in the axial direction, so that magnetic flux can be suitably passed between the rotor 10 and the stator 61.

[0049] In this embodiment, the insides of the holes constituting the pair of first flux barrier parts 21a, 21b, the pair of second flux barrier parts 22a, 22b, and the pair of third flux barrier parts 23a, 23b are, for example, hollow parts. The insides of the holes constituting each flux barrier part may be filled with a non-magnetic material such as resin, and each flux barrier part may be constituted by each hole part and the non-magnetic material such as resin filled in each hole part. In this specification, the "flux barrier part" is a part that can suppress the flow of magnetic flux. In other words, magnetic flux does not easily pass through each flux barrier part. Oil O may be flowed into the holes constituting each flux barrier part.

[0050] The pair of first flux barrier portions 21a, 21b are located at the radially outer edge of the rotor core 30. The pair of first flux barrier portions 21a, 21b are provided at a distance from the radially outer surface of the rotor core 30 toward the radially inner side. The pair of first flux barrier portions 21a, 21b are connected to the radially outer ends of the pair of first magnet accommodating portions 51a, 51b in the first direction D1a, D1b, that is, the ends on the outer side in the first direction. The first flux barrier portion 21a is located on the outer side in the first direction (+D1a side) of the first magnet accommodating portion 51a. The first flux barrier portion 21b is located on the outer side in the first direction (+D1b side) of the first magnet accommodating portion 51b.

[0051] The pair of first flux barrier parts 21a, 21b are arranged with a gap therebetween in the circumferential direction. The pair of first flux barrier parts 21a, 21b are arranged with the second magnet housing part 52, the second magnet 42, and the pair of second flux barrier parts 22a, 22b in between in the circumferential direction. Each of the pair of first flux barrier parts 21a, 21b is arranged facing each of the pair of second flux barrier parts 22a, 22b with a gap therebetween in the circumferential direction. The pair of first flux barrier parts 21a, 21b are located on the outer side of the pair of second flux barrier parts 22a, 22b in the circumferential direction. The first flux barrier part 21a and the first flux barrier part 21b are arranged line-symmetrically with each other with the magnetic pole center line Ld as the axis of symmetry when viewed in the axial direction. In the following description, the description of the first flux barrier part 21b may be omitted.

[0052] As shown in FIG. 4, the edge of the first flux barrier portion 21a in the circumferential direction on the side where the second flux barrier portion 22a is located, i.e., the edge on the circumferential inner side (-θ side), has a first edge portion 24a. The first edge portion 24a is a radially inner part of the edge portion on the circumferential inner side of the first flux barrier portion 21a. The first edge portion 24a extends radially outward from the first magnet housing portion 51a. As the first edge portion 24a moves radially outward, it is located on the side in the circumferential direction where the second flux barrier portion 22a is located, i.e., on the circumferential inner side. The imaginary line L1 shown in FIG. 4 is an imaginary line that passes through the radially inner end of the first edge portion 24a and the central axis J and extends radially when viewed in the axial direction. As the first edge portion 24a moves radially outward, it moves away from the imaginary line L1 toward the circumferential inner side. The first edge portion 24a is positioned inward in the second direction (-D2a side) as it moves toward the outer side in the first direction (+D1a side). The first edge portion 24a is positioned more inward in the second direction than the first magnet housing portion 51a. In this embodiment, the first edge portion 24a extends linearly in a direction inclined circumferentially relative to the radial direction when viewed in the axial direction. In this embodiment, the radially inner end of the first edge portion 24a is connected to the surface of the first magnet 41a on the inner side in the second direction when viewed in the axial direction.

[0053] The first flux barrier portion 21a has a second edge 24b at an edge portion opposite to the side where the second flux barrier portion 22a is located, i.e., an edge portion on the outer side in the circumferential direction (+θ side). The second edge portion 24b is connected to the first magnet housing portion 51a via a connection portion 24d. More specifically, a radially inner end portion of the second edge portion 24b is connected to an end portion of the support portion 53a on the inner side in the second direction (-D2a side) via the connection portion 24d. The connection portion 24d is a part of the outer edge portion in the circumferential direction of the first flux barrier portion 21a. The connection portion 24d has a circular arc shape that is convex toward the inner side in the circumferential direction (-θ side) when viewed in the axial direction.

[0054] The second edge portion 24b extends radially outward from the connection portion 24d. As the second edge portion 24b moves radially outward, it is positioned on the opposite side of the circumferential direction to the side where the second flux barrier portion 22a is positioned, that is, on the circumferential outer side (+θ side). As the second edge portion 24b moves toward the first direction outer side (+D1a side), it is positioned on the second direction outer side (+D2a side). In other words, as the second edge portion 24b moves toward the radially outward side (+D1a side) along the first direction, it is positioned on the side (+D2a side) that is circumferentially farther away from the second flux barrier portion 22a in the second direction D2a. In this embodiment, the second edge portion 24b extends linearly in a direction inclined in the circumferential direction with respect to the radial direction when viewed in the axial direction. In this embodiment, the inclination of the second edge portion 24b with respect to the radial direction passing through the radially inner end of the second edge portion 24b is larger than the inclination of the first edge portion 24a with respect to the radial direction passing through the radially inner end of the first edge portion 24a. The second edge portion 24b faces the first edge portion 24a in the circumferential direction, sandwiching the inside of the first flux barrier portion 21a therebetween.

[0055] The first flux barrier portion 21a has a radial outer edge portion 24c. The radial outer edge portion 24c is a radially outer edge portion of the first flux barrier portion 21a. The radial outer edge portion 24c extends in the circumferential direction when viewed in the axial direction. A circumferentially inner (-θ side) end portion of the radial outer edge portion 24c is connected to a radially outer end portion of the first edge portion 24a via a connecting portion 24e. The connecting portion 24e is an arc-shaped portion that is convex toward the second direction inner side (-D2a side) when viewed in the axial direction. A circumferentially outer (+θ side) end portion of the radial outer edge portion 24c is connected to a radially outer end portion of the second edge portion 24b via a connecting portion 24f. The connecting portion 24f is an arc-shaped portion that is convex toward the circumferentially outer side when viewed in the axial direction. The radial outer edge portion 24c is disposed radially inwardly away from the outer circumferential surface of the rotor core 30.

[0056] In this embodiment, the circumferential dimension of the first flux barrier portion 21a increases toward the radially outer side. Therefore, the first edge portion 24a is easily shaped to be located on the side in the circumferential direction where the second flux barrier portion 22a is located toward the radially outer side. Also, the second edge portion 24b is easily shaped to be located on the opposite side in the circumferential direction to the side where the second flux barrier portion 22a is located toward the radially outer side. The first flux barrier portion 21a has a portion connected to the first surface 44a and a portion connected to the third surface 44c, and is connected to the corner portion 45.

[0057] 3, the pair of second flux barrier portions 22a, 22b are connected to the second magnet accommodating portion 52. In this embodiment, the pair of second flux barrier portions 22a, 22b are connected to both circumferential ends of the second magnet accommodating portion 52, respectively. The pair of second flux barrier portions 22a, 22b protrude circumferentially outward from each circumferential end of the second magnet accommodating portion 52, as viewed in the axial direction. The circumferentially outer edge portions of the pair of second flux barrier portions 22a, 22b have an arc shape that protrudes circumferentially outward, as viewed in the axial direction.

[0058] The pair of second flux barrier portions 22a, 22b are located between the pair of first flux barrier portions 21a, 21b in the circumferential direction. The pair of second flux barrier portions 22a, 22b are arranged at an interval from each other in the circumferential direction. Each of the pair of second flux barrier portions 22a, 22b is arranged to sandwich a part of the rotor core 30 between the pair of first flux barrier portions 21a, 21b in the circumferential direction. In this embodiment, the second flux barrier portion 22a and the second flux barrier portion 22b are arranged line-symmetrically with each other with respect to the magnetic pole center line Ld as the axis of symmetry when viewed in the axial direction. In the following description, the description of the second flux barrier portion 22b may be omitted.

[0059] The magnetic flux that flows between the rotor 10 and the stator 61 flows between the first flux barrier portion 21a and the second flux barrier portion 22a, which sandwich a part of the rotor core 30 in the circumferential direction. For example, at least a part of the magnetic flux that flows from the teeth portion 65 to the rotor core 30 flows between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction. The magnetic flux that flows from the teeth portion 65 to the rotor core 30 and flows between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction passes between the pair of first magnets 41a, 41b and the second magnet 42, and flows from between the first flux barrier portion 21b and the second flux barrier portion 22b in the circumferential direction to the teeth portion 65. In addition, at least a portion of the magnetic flux flowing from the teeth portion 65 to the rotor core 30 may flow circumferentially between the first flux barrier portion 21b and the second flux barrier portion 22b, and then flow circumferentially between the first flux barrier portion 21a and the second flux barrier portion 22a to the teeth portion 65.

[0060] The maximum amount of magnetic flux flowing from the teeth portion 65 to the rotor core 30 per unit time is the maximum amount of magnetic flux that can flow per unit time through the portion of the teeth portion 65 that has the smallest circumferential dimension. For this reason, for example, by making the circumferential distance between the first flux barrier portion 21a and the second flux barrier portion 22a equal to or greater than the smallest circumferential dimension of the teeth portion 65, the amount of magnetic flux flowing from the teeth portion 65 between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction can be easily increased, and the torque of the rotating electric machine 60 can be easily increased. In addition, if the magnetic flux flowing between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction contains high-order magnetic flux components such as 24th-order, 48th-order, and 96th-order, the torque ripple becomes large, and the vibration of the rotor 10 may increase.

[0061] However, in this embodiment, as shown in FIG. 4, the minimum circumferential interval W1 between the first flux barrier portion 21a and the second flux barrier portion 22a, which sandwich a part of the rotor core 30 in the circumferential direction, is smaller than the minimum circumferential dimension W2 of the teeth portion 65. Therefore, by narrowing the circumferential interval between the first flux barrier portion 21a and the second flux barrier portion 22a, it is possible to block a part of the high-order magnetic flux components contained in the magnetic flux flowing between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction. This makes it possible to suppress the torque ripple from increasing, and to suppress the rotor 10 from vibrating. In addition, for example, if the circumferential interval between the first flux barrier portion 21a and the second flux barrier portion 22a is made too large, the magnetic flux density decreases, the generated torque decreases, and the output of the rotating electric machine 60 may decrease. In contrast, according to the present embodiment, the minimum interval W1 is made smaller than the minimum circumferential dimension W2 of the teeth portion 65, thereby suitably reducing the circumferential interval between the first flux barrier portion 21a and the second flux barrier portion 22a. This makes it possible to suppress a decrease in the magnetic flux density and thus a decrease in the output of the rotating electric machine 60.

[0062] Here, for example, if the minimum interval W1 is equal to or smaller than the circumferential dimension W3 at the radially inner end of the slot portion 68, there will be a time during one rotation of the rotor 10 when a portion of the rotor core 30 located between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction does not face any part of the teeth portion 65 in the radial direction. At this time, the magnetic flux flowing from the teeth portion 65 to the rotor core 30 will be less likely to flow between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction, and a high-order magnetic flux component that leaves the teeth portion 65 and returns to the teeth portion 65 via a short path will be generated. In this case, the torque ripple will become large, and the vibration of the rotor 10 may increase.

[0063] However, in this embodiment, the minimum circumferential interval W1 between the first flux barrier portion 21a and the second flux barrier portion 22a, which sandwich a portion of the rotor core 30 in the circumferential direction, is larger than the circumferential dimension W3 at the radially inner end of the slot portion 68. Therefore, even when the rotor 10 rotates, the portion of the rotor core 30 located between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction can be arranged to face at least a portion of one of the teeth portions 65 in the radial direction for a long time. In this embodiment, the portion of the rotor core 30 located between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction is always arranged to face at least a portion of one of the teeth portions 65 in the radial direction. This makes it easier for the magnetic flux flowing from the teeth portion 65 to the rotor core 30 to flow between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction. Therefore, higher-order magnetic flux components are less likely to be generated compared to when the minimum interval W1 is equal to or less than the circumferential dimension W3 at the radially inner end of the slot portion 68. This suppresses the generation of torque ripples, and further suppresses the vibration of the rotor 10. In addition, since the circumferential interval between the first flux barrier portion 21a and the second flux barrier portion 22a can be prevented from becoming too small, the amount of magnetic flux flowing between the first flux barrier portion 21a and the second flux barrier portion 22a in the circumferential direction can be prevented from becoming too small. This suppresses a decrease in the torque of the rotating electric machine 60.

[0064] As described above, according to this embodiment, by making the minimum spacing W1 smaller than the minimum circumferential dimension W2 of the tooth portion 65 and larger than the circumferential dimension W3 of the radially inner end of the slot portion 68, it is possible to preferably maintain the torque and output of the rotating electric machine 60 while preferably suppressing vibration of the rotor 10.

[0065] According to the present embodiment, the first edge 24a is located on the side where the second flux barrier portion 22a is located among the circumferential edges of the first flux barrier portion 21a. The first edge 24a is located on the side where the second flux barrier portion 22a is located in the circumferential direction as it moves radially outward. Therefore, the first edge 24a can cause a part of the first flux barrier portion 21a to protrude in the circumferential direction to the side where the second flux barrier portion 22a is located. This makes it easier for the first flux barrier portion 21a to suppress the generation of a magnetic flux that goes from the first magnet 41a to the inside in the second direction (-D2a side), goes around the outside of the corner of the first magnet 41a on the outside in the first direction (+D1a side) and the inside in the second direction, and returns to the first magnet 41a in a short path, as shown by the magnetic flux MF shown by the two-dot chain line in FIG. 4. This makes it possible to suppress demagnetization of the corners of the first magnet 41a and suppress a decrease in the amount of magnetic flux generated from the first magnet 41a. As a result, it is possible to suppress a decrease in the torque of the rotating electric machine 60 compared to when the first edge portion 24a extends parallel to the radial direction and when the first edge portion 24a is located on the opposite side in the circumferential direction to the side on which the second flux barrier portion 22a is located as it moves radially outward.

[0066] As described above, the torque of the rotating electric machine 60 can be improved by making the circumferential interval between the first flux barrier portion 21a and the second flux barrier portion 22a equal to or greater than the circumferential dimension of the teeth portion 65 at the portion where the circumferential dimension is smallest. On the other hand, in the present embodiment, the minimum interval W1 of the circumferential intervals between the first flux barrier portion 21a and the second flux barrier portion 22a is made smaller than the minimum circumferential dimension W2 of the teeth portion 65, so that the torque and output of the rotating electric machine 60 can be favorably maintained while the rotor 10 can be favorably suppressed from vibrating. As described above, even in this case, the torque of the rotating electric machine 60 can be suppressed from decreasing, but compared to the case where the minimum interval W1 is equal to or greater than the dimension W2, the torque of the rotating electric machine 60 may be reduced. In contrast, according to the present embodiment, as described above, the first edge portion 24a is positioned toward the side in the circumferential direction where the second flux barrier portion 22a is positioned as it moves radially outward, which makes it easier to suppress the generation of the magnetic flux MF as shown by the two-dot chain line in FIG. 4. This makes it possible to suppress demagnetization of the corners of the first magnet 41a and suppress a decrease in the amount of magnetic flux emitted from the first magnet 41a. This makes it possible to suppress a decrease in the torque of the rotating electric machine 60. Therefore, even if the minimum interval W1 is made smaller than the dimension W2 in order to suppress vibration of the rotor 10, the torque of the rotating electric machine 60 can be made to be the same as or greater than when the minimum interval W1 is equal to or greater than the dimension W2.

[0067] In this embodiment, the minimum interval W1 is the circumferential interval between the radially outer end of the first edge portion 24a and the circumferentially outer end of the second flux barrier portion 22a. In this embodiment, the dimension W2 is the circumferential dimension at the radially inner end of the tooth main body portion 66. In this embodiment, the circumferential dimension W3 at the radially inner end of the slot portion 68 is equal to the circumferential interval between the umbrella portions 67 of the circumferentially adjacent teeth portions 65. In other words, the minimum interval W1 among the circumferential intervals between the first flux barrier portion 21a and the second flux barrier portion 22a is larger than the circumferential interval between the umbrella portions 67 of the circumferentially adjacent teeth portions 65. By providing the umbrella portion 67, the circumferential dimension W3 at the radially inner end of the slot portion 68 can be suitably reduced. As a result, even if the minimum gap W1 is reduced, the portion of the rotor core 30 sandwiched between the first flux barrier portion 21a and the second flux barrier portion 22a can be more easily opposed to the teeth portion 65 in the radial direction. Therefore, the torque ripple can be more effectively prevented from increasing, and the rotor 10 can be more effectively prevented from vibrating.

[0068] The minimum interval W1 is smaller than the circumferential dimension W4 of the second flux barrier portion 22a. That is, the circumferential dimension W4 of the second flux barrier portion 22a is larger than the minimum interval W1 of the circumferential intervals between the first flux barrier portion 21a and the second flux barrier portion 22a. Therefore, at the circumferential outer end portion of the second magnet 42, the second flux barrier portion 22a can suitably suppress the magnetic flux from the second magnet 42 returning to the second magnet 42 through a short path around the corner of the second magnet 42. This can suppress the demagnetization of the circumferential outer end portion of the second magnet 42, and suppress the decrease in the amount of magnetic flux from the second magnet 42. Therefore, the torque of the rotating electric machine 60 can be more suitably suppressed from decreasing. "The circumferential dimension W4 of the second flux barrier portion 22a is larger than the minimum spacing W1" means that the maximum value of the circumferential dimension W4 of the second flux barrier portion 22a is larger than the minimum spacing W1, and the circumferential dimension W4 of a portion of the second flux barrier portion 22a may be smaller than the minimum spacing W1.

[0069] The first flux barrier portion 21a of one of the circumferentially adjacent magnet holding portions 31 is disposed so as to sandwich a part of the rotor core 30 in the circumferential direction with the first flux barrier portion 21b of the other of the circumferentially adjacent magnet holding portions 31. In the part of the rotor core 30 sandwiched in the circumferential direction between the first flux barrier portion 21a of one of the magnet holding portions 31 and the first flux barrier portion 21b of the other of the magnet holding portions 31, an inter-pole center line Lq passes through the portion. The inter-pole center line Lq is a first imaginary line that passes through the circumferential center between the circumferentially adjacent magnet holding portions 31 in the axial direction and extends in the radial direction. The inter-pole center line Lq passes through the central axis J in the axial direction. The inter-pole center line Lq passes through the circumferential center between the circumferentially adjacent magnetic pole portions 10P in the axial direction. The inter-pole centerline Lq passes through the q-axis of the rotor 10 when viewed in the axial direction. The direction in which the inter-pole centerline Lq extends is the q-axis direction of the rotor 10. As shown in FIG. 2, the inter-pole centerline Lq is provided between each pair of magnet holding portions 31. The direction in which the inter-pole centerline Lq extends and the direction in which the magnetic pole centerline Ld extends intersect with each other. The inter-pole centerline Lq and the magnetic pole centerline Ld are provided alternately along the circumferential direction.

[0070] 4, the first flux barrier portion 21a in one of the circumferentially adjacent magnet holding portions 31 and the first flux barrier portion 21b in the other of the circumferentially adjacent magnet holding portions 31 are arranged symmetrically with respect to the inter-pole center line Lq as an axis of symmetry when viewed in the axial direction. The minimum circumferential distance W5 between the first flux barrier portion 21a and the first flux barrier portion 21b arranged on either side of the inter-pole center line Lq in the circumferential direction is larger than the minimum distance W1 between the first flux barrier portion 21a and the second flux barrier portion 22a. In this embodiment, the minimum distance W5 is the circumferential distance between the connection portion 24f of the first flux barrier portion 21a and the connection portion 24f of the first flux barrier portion 21b. The minimum interval W5 is greater than the minimum circumferential dimension W2 of the teeth 65 and the circumferential dimension W3 of the radially inner end of the slot 68.

[0071] The magnetic flux flows between the rotor 10 and the stator 61 also between the magnet holding parts 31 adjacent to each other in the rotor core 30 in the circumferential direction. When the circumferential distance between the magnet holding parts 31 adjacent to each other in the circumferential direction is increased, the amount of magnetic flux increases, but the magnetic flux flowing through the part is likely to include high-order magnetic flux components. Therefore, the torque of the rotating electric machine 60 increases, but there is a risk that the rotor 10 is likely to vibrate. In contrast, in this embodiment, the second edge parts 24b of the first flux barrier parts 21a and 21b are located on the opposite side in the circumferential direction to the side where the second flux barrier parts 22a and 22b are located as they move radially outward. Therefore, the circumferential outer edge parts of the first flux barrier part 21a and the first flux barrier part 21b, which are arranged to sandwich a part of the rotor core 30 in the circumferential direction, can be brought close to each other's first flux barrier part. This makes it possible to prevent the minimum distance W5 between the first flux barrier portion 21a and the first flux barrier portion 21b from becoming too large, thereby more suitably preventing the rotor 10 from vibrating.

[0072] In the present embodiment, the second edge portion 24b is located on the side (+D2a side, +D2b side) of the second direction D2a, D2b that is farther away from the second flux barrier portion 22a, 22b in the circumferential direction as it moves toward the radially outer side (+D1a side, +D1b side) along the first direction D1a, D1b. Therefore, the circumferentially outer edge portions of the first flux barrier portion 21a and the first flux barrier portion 21b that are arranged to sandwich a part of the rotor core 30 in the circumferential direction can be more suitably brought closer to each other first flux barrier portion. This can more suitably prevent the minimum interval W5 between the first flux barrier portion 21a and the first flux barrier portion 21b from becoming too large. Therefore, the rotor 10 can be more suitably prevented from vibrating.

[0073] As shown in FIG. 5, the pair of third flux barrier portions 23a, 23b are connected to the radially inner ends of the pair of first magnet housing portions 51a, 51b in the first direction D1a, D1b, that is, the inner ends in the first direction D1a, D1b. The third flux barrier portion 23a is connected to the end of the first magnet housing portion 51a on the inner side in the first direction (-D1a side). The third flux barrier portion 23b is connected to the end of the first magnet housing portion 51b on the inner side in the first direction (-D1b side). The third flux barrier portion 23a and the third flux barrier portion 23b are arranged opposite to each other with the magnetic pole center line Ld sandwiched therebetween in the circumferential direction. The portion of the rotor core 30 sandwiched in the circumferential direction between the third flux barrier portion 23a and the third flux barrier portion 23b is a bridge portion 34 extending in the radial direction. When viewed in the axial direction, the magnetic pole center line Ld passes through the circumferential center of the bridge portion 34. When viewed in the axial direction, the third flux barrier portion 23a and the third flux barrier portion 23b are arranged line-symmetrically with each other with the magnetic pole center line Ld as the axis of symmetry. In the following description, the description of the third flux barrier portion 23b may be omitted.

[0074] The third flux barrier portion 23a has a first portion 25a and a second portion 25b. The first portion 25a is a portion connected to the first surface 44a of the first magnet 41a. In this embodiment, the first portion 25a is connected to a part of the first surface 44a including an end portion on the inside in the first direction (-D1a side). The first portion 25a protrudes further inward in the second direction (-D2a side) than the first surface 44a. The first portion 25a protrudes further inward in the first direction than the first magnet 41a. The outer edge portion of the first portion 25a has a first arc portion 25c that is arc-shaped when viewed in the axial direction. The first arc portion 25c is arc-shaped and convex toward the inside in the second direction when viewed in the axial direction.

[0075] The second portion 25b is a portion connected to the second surface 44b of the first magnet 41a. The second portion 25b protrudes from the second surface 44b toward the inside in the first direction (-D1a side). The end portion of the second portion 25b on the inside in the second direction (-D2a side) is connected to the end portion of the first portion 25a on the inside in the first direction. The outer edge portion of the second portion 25b has a second arc portion 25d that is arc-shaped when viewed in the axial direction. The second arc portion 25d is arc-shaped and convex radially inward when viewed in the axial direction. The outer edge portion of the second portion 25b has a straight portion 25e. The straight portion 25e extends in the direction in which the magnetic pole center line Ld extends when viewed in the axial direction. The radially outer end portion of the straight portion 25e is connected to the circumferentially inner end portion of the first arc portion 25c. A radially inner end of the straight portion 25e is connected to a circumferentially inner end of the second arcuate portion 25d.

[0076] The second portion 25b has a third arc portion 25f. The third arc portion 25f is an arc shape that is convex radially outward when viewed in the axial direction. The third arc portion 25f connects the circumferentially outer end of the second arc portion 25d and the end of the support portion 53b on the inner side in the second direction (-D2a side). As a result, one end of the support portion 53b in the second direction D2a, i.e., the inner end, is connected to the second portion 25b.

[0077] The third flux barrier portion 23a is connected to the corner portion 43. Therefore, the third flux barrier portion 23a can suitably suppress the occurrence of a flow of magnetic flux in which the magnetic flux leaving the first magnet 41a goes around the outside of the corner portion 43 and returns to the first magnet 41a via a short path. This can suppress the corner portion 43 of the first magnet 41a from being demagnetized, and suppress a decrease in the amount of magnetic flux leaving the first magnet 41a. This can more suitably suppress a decrease in the torque of the rotating electric machine 60.

[0078] In this specification, the phrase "the flux barrier portion is connected to a certain portion" includes that the certain portion is exposed to the gap when the portion of the flux barrier portion connected to the certain portion is configured by a gap, and includes that the certain portion is in contact with the nonmagnetic material when the portion of the flux barrier portion connected to the certain portion is configured by a nonmagnetic material such as resin. In this embodiment, the portions of the third flux barrier portion 23a connected to the first surface 44a, the second surface 44b, and the corner portion 43 are configured by gaps, and the first surface 44a, the second surface 44b, and the corner portion 43 are exposed to the gaps. In addition, the phrase "the flux barrier portion is connected to a certain portion" includes that the certain portion is connected to the outer edge portion of the flux barrier portion. In this embodiment, the support portion 53b is connected to the third arc portion 25f of the outer edge portion of the third flux barrier portion 23a.

[0079] At least a part of the first arc portion 25c and at least a part of the second arc portion 25d in the third flux barrier portion 23a constitute at least a part of an edge portion on one circumferential side (+θ side) of the bridge portion 34. In this embodiment, the edge portion on one circumferential side of the bridge portion 34 is constituted by a part of the first arc portion 25c, a straight portion 25e, and a part of the second arc portion 25d.

[0080] The radius of curvature of the first arc portion 25c is larger than the radius of curvature of the second arc portion 25d. Therefore, the portion of the circumferential edge of the bridge portion 34 provided between the pair of third flux barrier portions 23a, 23b that is constituted by the first arc portion 25c can be longer than the portion of the circumferential edge of the bridge portion 34 that is constituted by the second arc portion 25d. This allows the stress generated in the bridge portion 34 when the rotor 10 rotates to be suitably distributed and received by the first arc portion 25c. This makes it easier to ensure the rigidity of the bridge portion 34. In addition, since the radius of curvature of the second arc portion 25d in the second portion 25b is relatively small, the portion of the second portion 25b that is connected to the support portion 53b, i.e., the third arc portion 25f, can be suitably positioned away from the edge of the first magnet housing portion 51a on the outer side in the second direction (+D2a side) toward the inner side in the second direction (-D2a side). This allows the dimension of the support portion 53b in the second direction D2a to be larger than when the radius of curvature of the second arc portion 25d is equal to or greater than the radius of curvature of the first arc portion 25c. Therefore, the support portion 53b can stably support the first magnet 41a in the second direction D2a.

[0081] 3, the rotor core 30 has through holes 33 that penetrate the rotor core 30 in the axial direction. Therefore, for example, when the rotor 10 rotates, air flows through the through holes 33. This allows the air flowing through the through holes 33 to cool the rotor core 30 and the magnets 40 held by the rotor core 30. The through holes 33 penetrate the multiple core piece parts 36 in the axial direction.

[0082] The through hole 33 is provided at a position overlapping with the inter-pole center line Lq, which is the first virtual line, when viewed in the axial direction. In this embodiment, the through hole 33 has a generally triangular shape with rounded corners that protrude radially outward when viewed in the axial direction. The through hole 33 has an axisymmetric shape with respect to the inter-pole center line Lq that overlaps with the through hole 33 when viewed in the axial direction.

[0083] The through hole 33 has a third edge 33a arranged with a part of the rotor core 30 sandwiched between the first magnet housing portion 51a and the third edge 33a. When viewed in the axial direction, the third edge 33a extends in a direction inclined obliquely in the circumferential direction with respect to the radial direction. The third edge 33a is located on the circumferential outer side as it moves radially outward. In other words, the third edge 33a approaches the inter-pole center line Lq, which is the first virtual line, in the circumferential direction as it moves radially outward. Therefore, it is easy to arrange the circumferential edge of the through hole 33 along the pair of first magnet housing portions 51a, 51b. This makes it easy to flow magnetic flux between the pair of first magnet housing portions 51a, 51b and the through hole 33.

[0084] The distance W6 between the third edge 33a and the first magnet housing portion 51a in the second direction D2a becomes smaller toward the radially outward side. Therefore, the cross-sectional area of ​​the through hole 33 in a cross section perpendicular to the axial direction can be made larger than when, for example, the third edge 33a extends parallel to the first magnet housing portion 51a. This allows the amount of air flowing through the through hole 33 to be increased, making it easier to cool the rotor core 30 and the magnets 40.

[0085] Distance W6 is the distance between imaginary lines L3 and L4. Imaginary line L3 is an imaginary line that overlaps with an edge portion on the outer side in the second direction (+D2a side) of first magnet housing portion 51a when viewed in the axial direction and extends parallel to said edge portion. Imaginary line L4 is an imaginary line that overlaps with third edge portion 33a when viewed in the axial direction and extends parallel to third edge portion 33a.

[0086] In this embodiment, the circumferential dimension of the through hole 33 excluding the radially inner end portion becomes smaller toward the radially outer side. Therefore, the circumferential edge portion of the through hole 33 can be more easily arranged along the pair of first magnet housing portions 51a, 51b. This makes it easier to allow magnetic flux to flow between the pair of first magnet housing portions 51a, 51b and the through hole 33.

[0087] When viewed in the axial direction, the second virtual line L2 that passes through the center of the first magnet 41a in the first direction D1a and extends in the second direction D2a perpendicular to the first direction D1a overlaps with the through hole 33. Therefore, it is easy to suitably enlarge the through hole 33 in the radial direction. This makes it easy to increase the flow rate of air flowing through the through hole 33, and makes it easier to cool the rotor core 30 and the magnet 40. The through hole 33 is located radially inward from the radially outer end of both ends of the first magnet 41a in the first direction D1a, that is, the end on the outer side in the first direction (+D1a side). Therefore, it is possible to prevent the through hole 33 from becoming too large in the radial direction. This makes it possible to prevent the flow of magnetic flux in the rotor core 30 from being obstructed by the through hole 33.

[0088] Hereinafter, embodiments different from the above-described embodiments will be described. In the following description of each embodiment, the description of the same configuration as that described above in the description of each embodiment may be omitted by appropriately assigning the same reference numerals. In addition, the parts corresponding to the respective parts of the configuration described above in the description of each embodiment may be assigned the same names and different reference numerals to describe the differences from the above-described configuration, and the description of the similarities to the above-described configuration may be omitted. Note that, as the configuration whose description is omitted in each of the following embodiments, the same configuration as that described above in the description of each embodiment may be adopted within a range that does not contradict.

[0089] <Second embodiment> 6, in the rotor core 230 of the rotor 210 of this embodiment, the first flux barrier portion 221a of the magnet holding portion 231 has a protruding portion 224e that protrudes toward the second flux barrier portion 22a when viewed in the axial direction. Therefore, the minimum circumferential distance W7 between the first flux barrier portion 221a and the second flux barrier portion 22a that sandwich a part of the rotor core 230 in the circumferential direction can be easily and suitably made smaller than the minimum circumferential dimension W2 of the teeth portion 65.

[0090] The protruding portion 224e protrudes inward in the circumferential direction. The radially inner edge of the protruding portion 224e is the first edge portion 224a. The inclination of the first edge portion 224a relative to the radial direction is larger than the inclination of the first edge portion 24a relative to the radial direction in the first embodiment. The radially inner end of the first edge portion 224a is connected to the first magnet housing portion 51a via the connecting portion 224g. The connecting portion 224g has an arc shape that is convex toward the outside in the first direction (+D1a side) when viewed in the axial direction. The other configurations of the first edge portion 224a are similar to the other configurations of the first edge portion 24a in the first embodiment.

[0091] The radially outer edge of the protruding portion 224e is the fourth edge 224d. The fourth edge 224d constitutes a part of the radially outer edge of the first flux barrier portion 221a. The fourth edge 224d extends in the circumferential direction when viewed in the axial direction. The circumferentially inner edge (-θ side) of the protruding portion 224e is the fifth edge 224c. When viewed in the axial direction, the fifth edge 224c has an arc shape that convex toward the circumferentially inner side. The fifth edge 224c connects the circumferentially inner end of the first edge 224a and the circumferentially inner end of the fourth edge 224d.

[0092] Note that "the protruding portion 224e protrudes toward the second flux barrier portion 22a when viewed in the axial direction" means that when the protruding portion 224e is extended in the protruding direction when viewed in the axial direction, the extended portion of the protruding portion 224e overlaps with at least a part of the second flux barrier portion 22a. The extended portion of the protruding portion 224e in the protruding direction is, for example, a portion located between a virtual line L5 that extends the first edge portion 224a inward in the circumferential direction and a virtual line L6 that extends the fourth edge portion 224d inward in the circumferential direction when viewed in the axial direction. In FIG. 6, the virtual line L5 overlaps with the second flux barrier portion 22a when viewed in the axial direction. A part of the second flux barrier portion 22a is located between the virtual line L5 and the virtual line L6.

[0093] The second edge 224b of the first flux barrier portion 221a extends radially outward from the first magnet housing portion 51a when viewed in the axial direction. The inclination of the second edge 224b with respect to the radial direction is smaller than the inclination of the second edge 24b with respect to the radial direction in the first embodiment. The second edge 224b is located on the inner side in the second direction (-D2a side) as it moves toward the outer side in the first direction (+D1a side). In other words, the second edge 224b is located on the side of the second direction D2a that is closer to the second flux barrier portion 22a in the circumferential direction as it moves radially outward along the first direction D1a. The second edge 224b extends in a direction substantially parallel to the radial direction. The other configurations of the second edge 224b are similar to the other configurations of the second edge 24b in the first embodiment. The first flux barrier portion 221b is disposed symmetrically to the first flux barrier portion 221a with respect to the magnetic pole center line Ld as the axis of symmetry when viewed in the axial direction.

[0094] In this embodiment, the dimension of the first magnet housing portion 251a in the first direction D1a is larger than the dimension of the second magnet housing portion 52 in the radial direction. When viewed in the axial direction, the inclination of the first direction D1a in which the first magnet housing portion 251a extends relative to the radial direction is larger than the inclination of the first direction D1a in which the first magnet housing portion 51a extends relative to the radial direction in the first embodiment. The other configurations of the first magnet housing portion 251a are similar to the other configurations of the first magnet housing portion 51a in the first embodiment. The dimension of the first magnet 241a in the first direction D1a is larger than the dimension of the second magnet 42 in the radial direction. The other configurations of the first magnet 241a are similar to the other configurations of the first magnet 41a in the first embodiment. When viewed in the axial direction, the first magnet housing portion 251b is arranged in line symmetry with the first magnet housing portion 251a with the magnetic pole center line Ld as the axis of symmetry. When viewed in the axial direction, the first magnet 241b is disposed symmetrically to the first magnet 241a with the magnetic pole center line Ld as the axis of symmetry.

[0095] The radial distance between the portion of the pair of first magnet housing parts 251a, 251b that overlaps with the second magnet housing part 52 in the radial direction and the second magnet housing part 52 is smaller than the distance in the first embodiment. When the radial dimension of the second magnet 42 is smaller than the dimension of the first magnets 241a, 241b in the first directions D1a, D1b, it is preferable to bring the first magnets 241a, 241b closer to the second magnet 42 in the radial direction in order to suppress demagnetization of the second magnet 42 by the demagnetizing field received from the stator 61. By increasing the inclination of the first directions D1a, D1b in which the first magnet housing parts 251a, 251b extend with respect to the radial direction, the first magnets 241a, 241b can be brought closer to the second magnet 42 in the radial direction. In this case, the radially outer ends of the first magnet housing parts 251a, 251b are separated from the second magnet housing part 52 toward the circumferential outside, and the circumferential interval between the second flux barrier parts 22a, 22b and the first flux barrier parts 221a, 221b is likely to become large. In contrast, by providing the first flux barrier parts 221a, 221b with the protruding parts 224e protruding toward the second flux barrier parts 22a, 22b as in this embodiment, the minimum interval W7 among the circumferential intervals between the first flux barrier parts 221a, 221b and the second flux barrier parts 22a, 22b is likely to be the same as the minimum interval W1 in the first embodiment. As a result, it is possible to suppress vibration of the rotor 210, as in the first embodiment.

[0096] Furthermore, when the inclination of the first directions D1a, D1b in which the first magnet accommodating portions 251a, 251b extend with respect to the radial direction is increased, the first flux barrier portions 221a, 221b are disposed farther outward in the circumferential direction than the second flux barrier portions 22a, 22b compared to the first embodiment. Therefore, even if the inclination of the second edge portion 224b with respect to the radial direction is made smaller than the inclination of the second edge portion 24b with respect to the radial direction in the first embodiment, it is possible to prevent the circumferential distance between the first flux barrier portion 221a of one magnet holding portion 231 and the first flux barrier portion 221b of the other magnet holding portion 231 of the magnet holding portions 231 adjacent in the circumferential direction from becoming too wide. Furthermore, even if the second edge portion 224b is configured to be positioned on the side of the second direction D2a that approaches the second flux barrier portion 22a in the circumferential direction as it moves radially outward along the first direction D1a, it is possible to prevent the circumferential distance between the first flux barrier portion 221a of one magnet holding portion 231 and the first flux barrier portion 221b of the other magnet holding portion 231 from becoming too wide.

[0097] The pair of third flux barrier portions 223a, 223b do not have a first portion 25a, unlike the pair of third flux barrier portions 23a, 23b in the first embodiment. The other configurations of the magnet holding portion 231 are similar to the other configurations of the magnet holding portion 31 in the first embodiment. The other configurations of the rotor core 230 are similar to the other configurations of the rotor core 30 in the first embodiment. The other configurations of the rotor 310 are similar to the other configurations of the rotor 10 in the first embodiment.

[0098] <Third embodiment> As shown in FIG. 7, in the rotor core 330 of the rotor 310 of this embodiment, the magnet holding portion 331 has a pair of second magnet accommodating portions 352a, 352b arranged at a distance from each other in the circumferential direction. The pair of second magnet accommodating portions 352a, 352b extend in a direction that separates them from each other in the circumferential direction from the radially inner side toward the radially outer side as viewed in the axial direction. The pair of second magnet accommodating portions 352a, 352b are arranged along a V-shape that expands in the circumferential direction toward the radially outer side as viewed in the axial direction. As viewed in the axial direction, the inclination of the direction in which the pair of second magnet accommodating portions 352a, 352b extend relative to the radial direction is greater than the inclination of the direction in which the pair of first magnet accommodating portions 51a, 51b extend relative to the radial direction. The opening angle of the V-shape formed by the pair of second magnet accommodating portions 352a, 352b is greater than the opening angle of the V-shape formed by the pair of first magnet accommodating portions 51a, 51b.

[0099] The pair of second magnets 342a, 342b arranged in the pair of second magnet housing portions 352a, 352b, respectively, are arranged along a V-shape that widens in the circumferential direction as it goes radially outward when viewed in the axial direction. That is, in the magnetic pole portion 310P of this embodiment, two pairs of magnets 40 arranged along a V-shape when viewed in the axial direction are provided side by side in the radial direction. In this embodiment, the pair of second flux barrier portions 22a are connected to the radially outer ends of the pair of second magnet housing portions 352a, 352b, respectively.

[0100] In this manner, in each magnetic pole portion 310P of the present embodiment, two pairs of magnets 40 arranged along a V-shape as viewed in the axial direction are provided side by side in the radial direction. By providing four magnets 40 in each magnetic pole portion 310P in this manner, magnetic flux can be suitably passed between the rotor 310 and the stator 61.

[0101] In this embodiment, the magnet holder 331 has a pair of fourth flux barrier portions 326a, 326b. The pair of fourth flux barrier portions 326a, 326b are connected to the radially inner ends of the pair of second magnet housing portions 352a, 352b, respectively. The pair of fourth flux barrier portions 326a, 326b are arranged to sandwich the magnetic pole center line Ld in the circumferential direction. The fourth flux barrier portion 326a and the fourth flux barrier portion 326b are arranged line-symmetrically with each other with the magnetic pole center line Ld as the axis of symmetry when viewed in the axial direction.

[0102] Other configurations of the magnet holding portion 331 are similar to other configurations of the magnet holding portion 31 in the first embodiment. Other configurations of the rotor core 330 are similar to other configurations of the rotor core 30 in the first embodiment. Other configurations of the rotor 310 are similar to other configurations of the rotor 10 in the first embodiment.

[0103] The present invention is not limited to the above-described embodiment, and other configurations and methods may be adopted within the scope of the technical concept of the present invention. The number of magnets held in the magnet holding portion is not particularly limited as long as it is three or more. The second magnet housing portion may be arranged in any manner as long as it is located radially outside the pair of first magnet housing portions. The number of second magnet housing portions is not particularly limited as long as it is one or more. The number of magnet holding portions is not particularly limited as long as it is one or more.

[0104] The first magnet and the second magnet may have any shape and any size as long as they are located in each magnet housing. The shape of the first magnet and the shape of the second magnet may be the same as each other or different from each other. When viewed in the axial direction, the size of the first magnet in the direction perpendicular to the direction in which the first magnet extends and the size of the second magnet in the direction perpendicular to the direction in which the second magnet extends may be the same as each other or different from each other. When viewed in the axial direction, the size of the first magnet in the direction in which the first magnet extends and the size of the second magnet in the direction in which the second magnet extends may be the same as each other or different from each other. The type of the first magnet and the type of the second magnet may be the same as each other or different from each other.

[0105] The minimum circumferential spacing between the first flux barrier portion and the second flux barrier portion, which circumferentially sandwich a portion of the rotor core, may be any size as long as it is smaller than the minimum circumferential dimension of the teeth portion and larger than the circumferential dimension of the radially inner end of the slot portion. The minimum circumferential dimension of the teeth portion may be the circumferential dimension of any portion of the teeth portion. The teeth portion may not have an umbrella portion. In this case, the minimum circumferential dimension of the teeth portion may be the circumferential dimension of a portion of the teeth main body portion. The circumferential dimension of the radially inner end of the slot portion does not have to be the minimum circumferential dimension of the slot portion.

[0106] The first flux barrier portion may have any shape as long as it has a first edge portion. The second flux barrier portion may have any shape. The third flux barrier portion may have any shape. The third flux barrier portion may not be provided.

[0107] The use of the drive device to which the present invention is applied is not particularly limited. The drive device may be mounted on a vehicle for an application other than rotating an axle, for example, or may be mounted on equipment other than a vehicle. The rotating electric machine to which the present invention is applied is not limited to a motor, and may be a generator. The use of the rotating electric machine is not particularly limited. The rotating electric machine may be mounted on equipment other than a vehicle. The attitude of the rotating electric machine when used is not particularly limited. The central axis of the rotating electric machine may extend in any direction.

[0108] The present technology can be configured as follows. (1) A rotor rotatable about a central axis and a stator located radially outward of the rotor, the rotor having a rotor core and a plurality of magnets held by the rotor core, the stator having a core back portion surrounding the rotor, a plurality of teeth portions extending radially inward from the core back portion and arranged at intervals in the circumferential direction, and a plurality of slot portions each provided between adjacent teeth portions in the circumferential direction, the rotor core having a magnet holding portion for holding three or more of the magnets, the magnet holding portion having a pair of first magnet accommodating portions arranged at intervals from each other in the circumferential direction, a second magnet accommodating portion located radially outward of the pair of first magnet accommodating portions, a pair of first flux barrier portions, and a pair of second flux barrier portions, the plurality of magnets including a pair of first magnets respectively located in the pair of first magnet accommodating portions and a second magnet located in the second magnet accommodating portion, the pair of first magnet accommodating portions being arranged radially outward from the radially inner side as viewed in the axial direction, a pair of first flux barrier sections extending along a first direction separating from each other in the circumferential direction as a result of a circumferential movement of the pair of first magnet accommodating sections, each of the pair of first flux barrier sections being connected to an end portion located radially outward of both ends of the pair of first magnet accommodating sections in the first direction, the pair of second flux barrier sections being connected to the second magnet accommodating section and being located circumferentially between the pair of first flux barrier sections, each of the pair of second flux barrier sections being arranged to sandwich a part of the rotor core in the circumferential direction between the pair of second flux barrier sections, a minimum circumferential spacing between the first flux barrier section and the second flux barrier section sandwiching a part of the rotor core in the circumferential direction is smaller than a minimum circumferential dimension of the tooth section and is larger than a circumferential dimension of a radially inner end of the slot section, a circumferential edge of the first flux barrier section on a side where the second flux barrier section is located has a first edge portion, and the first edge portion is located on the circumferential side where the second flux barrier section is located as it moves radially outward. (2) A rotating electric machine as described in (1), wherein the tooth portions have a tooth main body portion extending radially inward from the core back portion and an umbrella portion connected to a radially inner end of the tooth main body portion and protruding on both circumferential sides beyond the radially inner ends of the tooth main body portion, and the minimum spacing is greater than the circumferential spacing between the umbrella portions of circumferentially adjacent tooth portions. (3) The rotating electric machine according to (1) or (2), wherein a circumferential dimension of the first flux barrier portion increases radially outward. (4) The rotating electric machine according to any one of (1) to (3), wherein the first flux barrier portion has a protruding portion that protrudes toward the second flux barrier portion when viewed in the axial direction. (5) A rotating electric machine according to any one of (1) to (4), wherein a circumferential edge of the first flux barrier portion opposite to a side on which the second flux barrier portion is located has a second edge portion, and the second edge portion is located on the opposite side in the circumferential direction from the side on which the second flux barrier portion is located as it moves radially outward. (6) A rotating electric machine as described in (5), wherein the second edge portion is located on a side that is circumferentially away from the second flux barrier portion in a direction perpendicular to both the first direction and the axial direction as it moves radially outward along the first direction. (7) The rotating electric machine according to any one of (1) to (6), wherein a circumferential dimension of the second flux barrier portion is greater than the minimum interval. (8) A rotating electric machine according to any one of (1) to (7), wherein the magnet holding portion has a pair of third flux barrier portions respectively connected to radially inner ends of both ends in the first direction of the pair of first magnet accommodating portions, the first magnet has a corner portion where a first surface facing a second direction perpendicular to both the first direction and the axial direction is connected to a second surface located radially inner among the surfaces facing the first direction, and the third flux barrier portion has a first portion connected to the first surface and a second portion connected to the second surface, and is connected to the corner portion. (9) A rotating electric machine as described in (8), wherein the first magnet accommodating portion has a support portion that supports the first magnet in the first direction, one end of the support portion in the second direction is connected to the second portion, an outer edge portion of the first portion has a first arc portion that is arc-shaped when viewed in the axial direction, and an outer edge portion of the second portion has a second arc portion that is arc-shaped when viewed in the axial direction, and a radius of curvature of the first arc portion is greater than a radius of curvature of the second arc portion. (10) A rotating electric machine described in any one of (1) to (9), wherein the magnet holding portions are arranged in a circumferential direction, the rotor core has a through hole that penetrates the rotor core in the axial direction, the through hole is arranged at a position that overlaps with a first imaginary line that passes through the circumferential center between circumferentially adjacent magnet holding portions when viewed in the axial direction and extends radially, the through hole has a third edge portion that is positioned to sandwich a portion of the rotor core between the first magnet accommodating portion, and the third edge portion approaches the first imaginary line in the circumferential direction as it moves radially outward. (11) The rotating electric machine according to (10), wherein a distance between the third edge portion and the first magnet housing portion in a direction perpendicular to both the first direction and the axial direction becomes smaller toward the radially outward side. (12) A rotating electric machine as described in (10) or (11), wherein, when viewed in the axial direction, a second virtual line passing through a center of the first magnet in the first direction and extending in a direction perpendicular to the first direction overlaps with the through hole, and the through hole is located radially inward relative to the radially outer end of both ends of the first magnet in the first direction. (13) A rotating electric machine according to any one of (1) to (12), wherein the second magnet accommodating portion extends in a direction perpendicular to a radial direction passing through a circumferential center of the magnet holding portion when viewed in the axial direction, and the pair of second flux barrier portions are respectively connected to both circumferential ends of the second magnet accommodating portion. (14) A rotating electric machine described in any one of (1) to (12), wherein the magnet holding portion has a pair of the second magnet accommodating portions arranged at a distance from each other in the circumferential direction, the pair of second magnet accommodating portions extend in directions that move away from each other in the circumferential direction as they move from the radially inner side to the radially outer side when viewed in the axial direction, and the pair of second flux barrier portions are each connected to the radially outer ends of the pair of second magnet accommodating portions. (15) A drive device comprising: a rotating electric machine according to any one of (1) to (14); and a gear mechanism connected to the rotating electric machine.

[0109] The configurations and methods described in this specification can be combined as appropriate within the scope of not being mutually inconsistent. [Explanation of symbols]

[0110] 10, 210, 310... rotor, 21a, 21b, 221a, 221b... first flux barrier portion, 22a, 22b... second flux barrier portion, 23a, 23b, 223a, 223b... third flux barrier portion, 24a, 224a... first edge portion, 24b, 224b... second edge portion, 25a... first portion, 25b... second portion, 2 5c...first arc portion, 25d...second arc portion, 30, 230, 330...rotor core, 31, 231, 331...magnet holding portion, 33...through hole, 33a...third edge portion, 40...magnet, 41a, 41b, 241a, 241b...first magnet, 42, 342a, 342b...second magnet, 43...corner portion, 44a...first surface, 4 4b...second surface, 51a, 51b, 251a, 251b...first magnet housing portion, 52, 352a, 352b...second magnet housing portion, 53b...support portion, 60...rotating electric machine, 61...stator, 64...core back portion, 65...teeth portion, 66...teeth main body portion, 67...umbrella portion, 68...slot portion, 70...gear mechanism, 100...driving device, 224e...protrusion portion, D1a, D1b...first direction, D2a, D2b...second direction, J...central axis line, L2...second virtual line, Lq...inter-pole center line (first virtual line), W1, W7...minimum interval, W2...minimum circumferential dimension of teeth portion, W3...circumferential dimension of radially inner end of slot portion, W6...distance

Claims

1. A rotor rotatable about a central axis; a stator positioned radially outward of the rotor; Equipped with The rotor is A rotor core; A plurality of magnets held by the rotor core; having The stator includes: A core back portion surrounding the rotor; a plurality of teeth portions extending radially inward from the core back portion and arranged at intervals in a circumferential direction; a plurality of slots each provided between the teeth portions adjacent to each other in a circumferential direction; having the rotor core has a magnet holding portion that holds three or more of the magnets, The magnet holding portion is A pair of first magnet housing portions arranged at intervals in the circumferential direction; A second magnet housing portion located radially outside the pair of first magnet housing portions; A pair of first flux barrier portions; A pair of second flux barrier portions; having The plurality of magnets include a pair of first magnets respectively positioned in the pair of first magnet housings; a second magnet located in the second magnet housing; Including, The pair of first magnet housing portions extend along a first direction in which they move apart in the circumferential direction from each other as they move from the radially inner side to the radially outer side when viewed in the axial direction, the pair of first flux barrier portions are connected to radially outer ends of the pair of first magnet housing portions in the first direction, the pair of second flux barrier portions are connected to the second magnet accommodating portion and are located between the pair of first flux barrier portions in a circumferential direction, each of the pair of second flux barrier portions is disposed such that a portion of the rotor core is sandwiched between each of the pair of first flux barrier portions in a circumferential direction; a minimum circumferential distance between the first flux barrier portion and the second flux barrier portion, which sandwich a portion of the rotor core in a circumferential direction, is smaller than a minimum circumferential dimension of the teeth portion and is larger than a circumferential dimension of a radially inner end portion of the slot portion, a circumferential edge portion of the first flux barrier portion on a side where the second flux barrier portion is located has a first edge portion, The first edge portion is positioned on a side in the circumferential direction where the second flux barrier portion is located as it moves radially outward.

2. The teeth portion includes: a teeth main body portion extending radially inward from the core back portion; an umbrella portion connected to a radially inner end of the tooth main body portion and protruding on both sides in a circumferential direction beyond the radially inner end of the tooth main body portion; having The rotating electric machine according to claim 1 , wherein the minimum interval is greater than a circumferential interval between the umbrella portions of the teeth portions adjacent to each other in the circumferential direction.

3. The rotating electric machine according to claim 1 , wherein a circumferential dimension of the first flux barrier portion increases radially outward.

4. The rotating electric machine according to claim 1 , wherein the first flux barrier portion has a protruding portion that protrudes toward the second flux barrier portion when viewed in the axial direction.

5. a circumferential edge portion of the first flux barrier portion on a side opposite to a side on which the second flux barrier portion is located has a second edge portion, The rotating electric machine according to claim 1 , wherein the second edge portion is located on a side opposite to a side on which the second flux barrier portion is located in the circumferential direction as it moves radially outward.

6. 6. The rotating electric machine according to claim 5, wherein the second edge portion is located on a side that is circumferentially away from the second flux barrier portion in a direction perpendicular to both the first direction and the axial direction as the second edge portion moves radially outward along the first direction.

7. The rotating electric machine according to claim 1 , wherein a circumferential dimension of the second flux barrier portion is greater than the minimum interval.

8. the magnet holding portion includes a pair of third flux barrier portions connected to radially inner ends of the pair of first magnet accommodating portions in the first direction, the first magnet has a corner portion where a first surface facing a second direction perpendicular to both the first direction and the axial direction and a second surface located radially inward among the surfaces facing the first direction are connected to each other; The rotating electric machine according to claim 1 , wherein the third flux barrier portion has a first portion connected to the first surface and a second portion connected to the second surface, and is connected to the corner portion.

9. the first magnet housing portion has a support portion that supports the first magnet in the first direction, One end of the support portion in the second direction is connected to the second portion, The outer edge portion of the first portion has a first arc portion that is arc-shaped when viewed in the axial direction, The outer edge portion of the second portion has a second arc portion that is arc-shaped when viewed in the axial direction, The rotating electric machine according to claim 8 , wherein a radius of curvature of the first arcuate portion is larger than a radius of curvature of the second arcuate portion.

10. The magnet holding portion is provided in a plurality of positions aligned in the circumferential direction, The rotor core has a through hole that passes through the rotor core in an axial direction, The through hole is provided at a position overlapping with a first imaginary line that passes through a circumferential center between the magnet holding portions adjacent in the circumferential direction and extends in a radial direction, when viewed in the axial direction, the through hole has a third edge portion disposed between the first magnet accommodating portion and a portion of the rotor core, The rotating electric machine according to claim 1 , wherein the third edge portion approaches the first imaginary line in the circumferential direction as it moves radially outward.

11. The rotating electric machine according to claim 10 , wherein a distance between the third edge portion and the first magnet housing portion in a direction perpendicular to both the first direction and the axial direction decreases toward the radially outward side.

12. When viewed in the axial direction, a second imaginary line that passes through a center of the first magnet in the first direction and extends in a direction perpendicular to the first direction overlaps with the through hole, The rotating electric machine according to claim 10 , wherein the through hole is located radially inward of a radially outer end of each of both ends of the first magnet in the first direction.

13. The second magnet housing portion extends in a direction perpendicular to a radial direction passing through a circumferential center of the magnet holding portion when viewed in the axial direction, The rotating electric machine according to claim 1 , wherein the pair of second flux barrier portions are connected to both circumferential ends of the second magnet housing portion, respectively.

14. the magnet holding portion has a pair of the second magnet accommodating portions arranged at an interval in the circumferential direction, The pair of second magnet housing portions extend in directions that move away from each other in the circumferential direction from the radially inner side toward the radially outer side as viewed in the axial direction, The rotating electric machine according to claim 1 , wherein the pair of second flux barrier portions are connected to radially outer ends of the pair of second magnet housing portions, respectively.

15. A rotating electric machine according to any one of claims 1 to 12, a gear mechanism connected to the rotating electric machine; A drive device comprising:

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