Rotor, rotating electrical machine, and drive device

Abstract

The utility model provides a rotor, a rotating motor and a driving device. The rotor includes: a shaft; a rotor core having a first core member portion and a second core member portion; a first plate disposed between the first core part and the second core part in the axial direction; and a second plate disposed between the first core member portion and the first plate in the axial direction and / or between the second core member portion and the first plate in the axial direction. The first plate has a plate flow path portion connecting a second shaft hole portion provided in the shaft and a core flow path portion provided in the rotor core. The plate flow path portion has a supply flow path portion overlapping the iron core flow path portion, and a connection flow path portion connecting the second shaft hole portion and the supply flow path portion. The second plate has a through hole penetrating the second plate in the axial direction. When viewed in the axial direction, the through hole overlaps the iron core flow path portion and the supply flow path portion and is disposed at a different position from the magnet hole. At least a portion of the second plate and at least a portion of the magnet hole face each other in the axial direction.

Description

Technical Field

[0001] The utility model relates to a rotor, a rotating motor and a driving device. Background Art

[0002] Conventionally, there is known a rotating electric machine having a structure for guiding a fluid from an in-shaft flow passage provided in a shaft to an in-core flow passage provided in a rotor core (for example, Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2015-82924

[0004] In the rotating electrical machine as described above, part of the fluid introduced into the flow path in the core may flow into the magnet hole. When the fluid flows into the magnet hole, the mass of the rotor is uneven due to the fluid, the vibration of the rotor increases, and noise may be generated from the rotating electrical machine. Utility Model Content

[0005] In view of the above situation, one of the objects of the present invention is to provide a rotor, a rotating electrical machine, and a driving device having a structure capable of suppressing the flow of a fluid into a magnet hole.

[0006] The first mode of the present invention provides a rotor which can rotate around a central axis, characterized in that the rotor comprises: a shaft which extends in an axial direction; a rotor core which is fixed to the outer peripheral surface of the shaft and comprises a first core piece portion and a second core piece portion which are arranged in an axial direction; a first plate which is arranged in an axial direction between the first core piece portion and the second core piece portion; a second plate which is arranged in at least one of an axial direction between the first core piece portion and the first plate and an axial direction between the second core piece portion and the first plate; and a plurality of magnets which are retained in the rotor core, the shaft comprising: a first axial hole portion which extends in an axial direction; and a second axial hole portion which is connected to the first axial hole portion and is opened in the outer peripheral surface of the shaft. The first core member and the second core member respectively have: a magnet hole for arranging the magnet; and a core flow path portion extending axially, the first plate has a plate flow path portion connecting the second axial hole portion and the core flow path portion, the plate flow path portion has: a supply flow path portion, which overlaps with the core flow path portion when viewed axially; and a connecting flow path portion connecting the second axial hole portion and the supply flow path portion, the second plate has a through hole passing through the second plate axially, which overlaps with the core flow path portion and the supply flow path portion when viewed axially, and is arranged at a position different from the magnet hole, and at least a portion of the second plate is axially opposed to at least a portion of the magnet hole.

[0007] A rotor according to a second aspect of the present invention is characterized in that, in the rotor according to the first aspect, the axial dimension of the first plate is larger than the axial dimension of the second plate.

[0008] A rotor according to a third aspect of the present invention is characterized in that, in the rotor according to the second aspect, a material constituting the first plate and a material constituting the second plate are different from each other.

[0009] A rotor according to a fourth aspect of the present invention is characterized in that, in the rotor according to the third aspect, a material constituting the first plate is an aluminum alloy, and a material constituting the second plate is an iron alloy.

[0010] A rotor according to a fifth aspect of the present invention is characterized in that, in the rotor according to the first aspect, a material constituting the first plate and a material constituting the second plate are different from a material constituting the first core member and a material constituting the second core member.

[0011] The sixth embodiment of the rotor of the present invention is characterized in that, in the fifth embodiment of the rotor, the rotor core has a plurality of core parts including the first core part and the second core part, and the number of the core parts located on one side axially of the first plate and the second plate is the same as the number of the core parts located on the other side axially of the first plate and the second plate.

[0012] The seventh type of rotor of the present invention is characterized in that, in the fifth type of rotor, when the axial center between the axial center of the rotor core and the end on one axial side of the rotor core is set as the first center, and the axial center between the axial center of the rotor core and the end on the other axial side of the rotor core is set as the second center, the first plate and the second plate are located axially between the first center and the second center.

[0013] A rotor according to an eighth aspect of the present invention is characterized in that, in the rotor according to the first aspect, a cross-sectional area of ​​the through hole is larger than a cross-sectional area of ​​the core flow path portion in a cross section perpendicular to the axial direction.

[0014] The ninth aspect of the rotor of the present invention is characterized in that, in the first aspect of the rotor, the radial outer edge portion of the through hole is located at the same radial position as the radial outer edge portion of the supply flow path portion, or is located radially outward of the radial outer edge portion of the supply flow path portion.

[0015] A tenth aspect of the rotor of the present invention is characterized in that, in the rotor of the first aspect, a part of the plurality of magnets is located radially inward of the core flow path portion, and another part of the plurality of magnets is located radially outward of the core flow path portion.

[0016] The eleventh embodiment of the rotor of the present invention is characterized in that, in the rotor of the first embodiment, the first core component part and the second core component part have a plurality of the magnet holes, and the radial outer edge portion of the second plate has a first outer edge portion located radially inward of the radial outer edge portion of at least one of the magnet holes, and when viewed along the axial direction, the first outer edge portion overlaps with at least one of the magnet holes.

[0017] A twelfth aspect of the present invention is characterized in that, in the eleventh aspect of the rotor, all of the magnet holes have portions overlapping the first outer edge portions at radially inner sides of the radially outer edge portions of the magnet holes when viewed in the axial direction.

[0018] The thirteenth embodiment of the rotor of the utility model is characterized in that, in the eleventh embodiment of the rotor, the radial outer edge portion of the second plate has a second outer edge portion located radially outward of the radial outer edge portion of the magnet hole, and the second outer edge portion has a portion located at the same position as the magnet hole in the circumferential direction.

[0019] The fourteenth embodiment of the rotor of the present invention is characterized in that, in the first embodiment of the rotor, the plate flow path portion is composed of a hole that penetrates the first plate axially, and the second plate is arranged on both sides between the first core member portion and the first plate axially and between the second core member portion and the first plate axially.

[0020] The rotor of the fifteenth aspect of the present invention is characterized in that, in the rotor of the fourteenth aspect, the plate flow path portion has a portion overlapping with the magnet hole when viewed axially, and the second plate and the portion of the magnet hole that overlaps with the plate flow path portion when viewed axially are axially opposite.

[0021] A rotor according to a sixteenth aspect of the present invention is characterized in that, in the rotor according to the first aspect, a plurality of plate groups including the first plate and the second plate are provided at intervals in the axial direction.

[0022] A seventeenth aspect of the present invention provides a rotating electrical machine, characterized in that the rotating electrical machine includes: a rotor according to any one of the first to sixteenth aspects; and a stator that faces the rotor with a gap therebetween.

[0023] An eighteenth aspect of the present invention provides a driving device, characterized in that the driving device comprises: the rotating electric machine of the seventeenth aspect; and a gear mechanism connected to the rotating electric machine.

[0024] According to the present invention, in the rotating electrical machine and the driving device, it is possible to suppress the fluid from flowing into the magnet hole of the rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a diagram schematically showing the driving device in the first embodiment.

[0026] Figure 2 It is a perspective view showing the rotor in the first embodiment.

[0027] Figure 3 It is an exploded perspective view showing a part of the rotor in the first embodiment.

[0028] Figure 4 It is a cross-sectional view showing the rotor in the first embodiment.

[0029] Figure 5 1 is a partial cross-sectional view showing the rotor in the first embodiment, and is a diagram showing the first plate.

[0030] Figure 6 is a partial cross-sectional view showing a portion of the rotor in the first embodiment, Figure 5 A partial enlarged view of .

[0031] Figure 7 It is a cross-sectional view showing a part of the rotor in the first embodiment, and is a diagram showing the flow of oil inside the rotor.

[0032] Figure 8 1 is a partial cross-sectional view showing the rotor in the first embodiment, and is a diagram showing the second plate.

[0033] Fig. 9 It is a cross-sectional view showing a part of the rotor in the second embodiment.

[0034] Fig.10 This is a diagram showing a part of a rotor in a third embodiment.

[0035] Fig.11 It is a cross-sectional view showing a part of the rotor in the fourth embodiment.

[0036] Fig.12 This is a partial cross-sectional view showing a part of the rotor in the fifth embodiment.

[0037] Description of symbols

[0038] 10, 210, 310, 410, 510: rotor; 20: shaft; 22a: first shaft hole; 22b: second shaft hole; 30: rotor core; 95, 295: through hole; 35: core flow path; 37: core member; 37A: first core member (core member); 37B: second core member (core member); 37C: third core member (core member); 37D: fourth core member (core member); 40: magnet; 41a, 41b: first magnet (magnet); 42, 542a, 542b: second magnet (magnet); 5 0: magnet hole; 51a, 51b: first magnet hole (magnet hole); 52, 552a, 552b: second magnet hole (magnet hole); 60: rotating motor; 61: stator; 65: gear mechanism; 70: flow path; 80: first plate; 81: plate flow path portion; 82: supply flow path portion; 83: connecting flow path portion; 90, 290, 390: second plate; 100: driving device; 396: radial outer edge portion; 396a: first outer edge portion; 396b: second outer edge portion; 490a: plate group; C1: first center; C2: second center; J: center axis. DETAILED DESCRIPTION

[0039] In the accompanying 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 to which the arrow of the Z-axis points (+Z side) is the upper side, and the side opposite to which the arrow of the Z-axis points (-Z side) is the lower side. The X-axis direction is a direction perpendicular to the Z-axis direction, and is the front-to-back direction of a vehicle equipped with a drive device in the following embodiments. In the following embodiments, the side to which the arrow of the X-axis points (+X side) is the front side of the vehicle, and the side opposite to which the arrow of the X-axis 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, i.e., the vehicle width direction. In the following embodiments, the side to which the arrow of the Y-axis points (+Y side) is the left side of the vehicle, and the side opposite to which the arrow of the Y-axis points (-Y side) is the right side of the vehicle.

[0040] In addition, the positional relationship in the front-rear direction is not limited to the positional relationship in the following embodiments, 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 addition, in this specification, "parallel direction" also includes a substantially parallel direction, and "vertical direction" also includes a substantially vertical direction.

[0041] The center axis J shown in the figure appropriately is an imaginary axis extending in a direction intersecting the up-down direction. In more detail, the center axis J extends in the Y-axis direction perpendicular to the up-down direction, that is, the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the center axis J is referred to as "axial", the radial direction centered on the center axis J is referred to as "radial", and the circumferential direction centered on the center axis J, that is, the direction around the center axis J is referred to as "circumferential". In the following description, the left side (+Y side) in the axial direction is referred to as "one axial side", and the right side (-Y side) in the axial direction is referred to as "the other axial side". The up-down direction is, for example, the vertical direction, and the front-back direction and the left-right direction (axial direction) are, for example, horizontal directions perpendicular to the vertical direction.

[0042] The arrow θ shown in the figure appropriately indicates the circumferential direction. In the following description, the side in the circumferential direction that moves counterclockwise around the central axis J when viewed from the axial side (+Y side), that is, the side toward which the arrow θ points (+θ side) is referred to as "one side in the circumferential direction", and the side in the circumferential direction that moves clockwise around the central axis J when viewed from the axial side, that is, the side opposite to the side toward which the arrow θ points (-θ side) is referred to as "the other side in the circumferential direction".

[0043] <First embodiment>

[0044] Figure 1 The drive device 100 of the present embodiment shown is a drive device mounted on a vehicle and rotates the axle 68 of the vehicle. The vehicle equipped with the drive device 100 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). Figure 1 As shown, the driving device 100 includes a rotary electric machine 60, a gear mechanism 65 connected to the rotary electric machine 60, and a housing 63 that accommodates the rotary electric machine 60 and the gear mechanism 65. In the present embodiment, the rotary electric machine 60 is a motor.

[0045] The housing 63 accommodates the rotating motor 60 and the gear mechanism 65 inside. The housing 63 has a motor housing 63a that accommodates the rotating motor 60 inside and a gear housing 63b that accommodates the gear mechanism 65 inside. The motor housing 63a is connected to the other axial side (-Y side) of the gear housing 63b. The motor housing 63a has a peripheral wall portion 63c, a partition wall portion 63d and a cover portion 63e. The peripheral wall portion 63c and the partition wall portion 63d are, for example, parts of the same single component. The cover portion 63e is, for example, separate from the peripheral wall portion 63c and the partition wall portion 63d.

[0046] The peripheral wall portion 63c is in the shape of a tube that surrounds the central axis J and opens on the other axial side (-Y side). The partition wall portion 63d is connected to the end of the peripheral wall portion 63c on one axial side (+Y side). The partition wall portion 63d divides the interior of the motor housing 63a and the interior of the gear housing 63b in the axial direction. The partition wall portion 63d has a partition wall opening 63f that connects the interior of the motor housing 63a with the interior of the gear housing 63b. The partition wall portion 63d is held by a bearing 64a. The cover portion 63e is fixed to the end of the peripheral wall portion 63c on the other axial side. The cover portion 63e closes the opening of the peripheral wall portion 63c on the other axial side. The cover portion 63e is held by a bearing 64b.

[0047] The gear housing 63b contains oil O inside. The oil O is stored in the lower area of ​​the gear housing 63b. The oil O circulates in the flow path 70 described later. The oil O is used as a refrigerant for cooling the rotary electric machine 60. In addition, the oil O is used as a lubricating oil in the gear mechanism 65. As the oil O, for example, in order to exert the functions of a refrigerant and a lubricating oil, it is preferable to use an oil equivalent to an automatic transmission lubricating oil (ATF: Automatic Transmission Fluid) having a relatively low viscosity.

[0048] The gear mechanism 65 is connected to the rotary motor 60, and transmits the rotation of the rotor 10 described later to the axle 68 of the vehicle. The gear mechanism 65 of the present embodiment has a reduction gear 66 connected to the rotary motor 60 and a differential device 67 connected to the reduction gear 66. The differential device 67 has a ring gear 67a. The torque output from the rotary motor 60 is transmitted to the ring gear 67a via the reduction gear 66. The lower end of the ring gear 67a is immersed in the oil O stored in the gear housing 63b. The oil O is lifted up by the rotation of the ring gear 67a. The lifted oil O is provided to the reduction gear 66 and the differential device 67 as lubricating oil, for example.

[0049] The rotating electric machine 60 has a rotor 10 that can rotate around a central axis J and a stator 61 that is opposite to the rotor 10 with a gap therebetween. In the present embodiment, the stator 61 is located radially outside the rotor 10 and is radially opposite to the rotor 10. The stator 61 has a stator core 61a and a coil assembly 61b mounted on the stator core 61a. The coil assembly 61b has a plurality of coils 61c mounted on the stator core 61a. Although not shown in the figure, the coil assembly 61b may have a bundling member for bundling the coils 61c, or may have a lap wire that connects the coils 61c to each other. The coil assembly 61b has coil ends 61d and 61e that protrude axially from the stator core 61a.

[0050] In the present embodiment, the rotor 10 rotates toward one side in the circumferential direction (toward the +θ side) with the central axis J as the center. That is, in the present embodiment, the one side in the circumferential direction is the front side (+θ side) in the rotation direction of the rotor 10, and the other side in the circumferential direction is the rear side (-θ side) in the rotation direction of the rotor 10. The rotor 10 has a shaft 20 extending in the axial direction with the central axis J as the center, and a rotor core 30 fixed to the outer peripheral surface of the shaft 20. Figure 2 As shown, the rotor 10 includes a plurality of magnets 40 held by the rotor core 30, end plates 38a, 38b respectively disposed at the ends of both axial sides of the rotor core 30, and a first plate 80. Figure 3 As shown, the rotor 10 has a second plate 90 .

[0051] The shaft 20 can rotate about the central axis J. Figure 1 As shown, the shaft 20 is supported by bearings 64a and 64b so as to be rotatable. In the present embodiment, the shaft 20 is a hollow shaft. The shaft 20 is in a cylindrical shape in which oil O as a refrigerant can flow. A reduction device 66 is connected to the end of the shaft 20 on one axial side (+Y side). Figure 2 As shown, a radially recessed recess 21 is provided on the outer circumferential surface of the shaft 20. The recess 21 is recessed radially inward from the outer circumferential surface of the shaft 20. The recess 21 extends in the axial direction. Figure 4 As shown, in the present embodiment, a pair of recessed portions 21 are provided in the radial direction across the central axis J. When viewed in the axial direction, the interior of the recessed portion 21 is substantially quadrilateral.

[0052] like Figure 1 As shown, the shaft 20 has a first shaft hole portion 22a extending in the axial direction. The interior of the first shaft hole portion 22a is constituted by the interior of the shaft 20 as a hollow shaft. In this embodiment, the first shaft hole portion 22a is a hole that penetrates the shaft 20 in the axial direction and is open on both sides in the axial direction. Figure 4 and Figure 5 As shown, in the present embodiment, the first shaft hole portion 22a is a circular hole centered on the central axis J.

[0053] like Figure 5 As shown, the shaft 20 has a second shaft hole portion 22b connected to the first shaft hole portion 22a. The second shaft hole portion 22b is a hole that penetrates the wall portion of the shaft 20 in the radial direction from the inner circumferential surface of the shaft 20 to the outer circumferential surface of the shaft 20. The second shaft hole portion 22b is open at the inner circumferential surface of the shaft 20 and the outer circumferential surface of the shaft 20. In the present embodiment, the second shaft hole portion 22b is a circular hole.

[0054] The second axial hole portion 22b has a hole body portion 22c and an opening portion 22d. The hole body portion 22c extends radially outward from the inner circumferential surface of the shaft 20. The inner diameter of the hole body portion 22c is the same in the entire radial direction. The opening portion 22d is arranged at the radially outer end of the hole body portion 22c. The opening portion 22d opens on the outer circumferential surface of the shaft 20. The inner diameter of the opening portion 22d increases as it moves toward the radially outer side. In the present embodiment, a plurality of second axial hole portions 22b are arranged at intervals from each other in the circumferential direction. The plurality of second axial hole portions 22b are arranged at equal intervals throughout the entire circumference of the circumference. In the present embodiment, eight second axial hole portions 22b are arranged. Each second axial hole portion 22b is arranged at a position that overlaps with the second imaginary line Lq described later when viewed in the axial direction.

[0055] like Figure 4 As shown, the rotor core 30 is fixed to the outer peripheral surface of the shaft 20. The rotor core 30 is substantially cylindrical with the center axis J as the center. The rotor core 30 has a hole 30h that penetrates the rotor core 30 in the axial direction. The center axis J passes through the inside of the hole 30h. In the present embodiment, the hole 30h is a substantially circular hole with the center axis J as the center. The shaft 20 passes through the hole 30h in the axial direction. The inner peripheral surface of the hole 30h is fixed to the outer peripheral surface of the shaft 20. The shaft 20 is, for example, press-fitted into the hole 30h.

[0056] A convex portion 32 protruding radially inward is provided at the inner edge of the hole 30h. Although not shown in the figure, the convex portion 32 extends in the axial direction. A pair of convex portions 32 is provided in the radial direction across the center axis J. The pair of convex portions 32 are respectively fitted into the pair of concave portions 21. As a result, the shaft 20 and the rotor core 30 are hooked with each other in the circumferential direction, and the shaft 20 and the rotor core 30 are inhibited from rotating relative to each other in the circumferential direction. When viewed in the axial direction, the convex portion 32 is substantially quadrilateral.

[0057] A pair of first recessed portions 33a, 33b and a second recessed portion 34 that are recessed radially outward are provided at the inner edge of the hole 30h. Two pairs of the first recessed portions 33a, 33b are provided in the radial direction across the center axis J. Each pair of first recessed portions 33a, 33b is adjacent to both sides of each convex portion 32 in the circumferential direction, and is provided across each convex portion 32 in the circumferential direction. A pair of second recessed portions 34 is provided in the radial direction across the center axis J. When viewed in the axial direction, the pair of second recessed portions 34 are arranged across the center axis J in a radial direction that is perpendicular to the radial direction of the pair of convex portions 32 across the center axis J. The pair of second recessed portions 34 extend in the circumferential direction. By providing the first recessed portions 33a, 33b and the second recessed portion 34, a part of the stress generated in the shaft 20 when the shaft 20 is press-fitted into the hole 30h can be released at a portion of the shaft 20 that is radially opposed to the first recessed portions 33a, 33b and the second recessed portion 34. Therefore, the shaft 20 can be easily press-fitted into the hole 30h.

[0058] Alternatively, a recessed portion may be provided on the inner edge of the hole 30h instead of the protruding portion 32, and a protruding portion that fits into the recessed portion provided on the inner edge of the hole 30h may be provided on the outer peripheral surface of the shaft 20 instead of the recessed portion 21. Even in this case, the shaft 20 and the rotor core 30 can be prevented from rotating relative to each other in the circumferential direction.

[0059] like Figure 2 As shown, the rotor core 30 has a plurality of core pieces 37 arranged in the axial direction. The core pieces 37 are magnetic bodies. The core pieces 37 are in the shape of a ring surrounding the shaft 20. In the present embodiment, the core pieces 37 are in the shape of a circular ring centered on the central axis J. The inner circumference of the core piece 37 is fixed to the outer circumference of the shaft 20 by pressing or the like. The core piece 37 and the shaft 20 are fixed so as not to move relative to each other in the axial, radial and circumferential directions. Figure 1 As shown, each core member 37 has a plurality of plate members 30a stacked in the axial direction. The plate member 30a is a plate-shaped member with the plate surface facing the axial direction. The plate member 30a is roughly annular centered on the central axis J. The material of the plate member 30a is a rolled steel material made by rolling in a predetermined direction. The material of the plate member 30a is, for example, an electromagnetic steel plate.

[0060] like Figure 2 As shown, in the present embodiment, the plurality of core pieces 37 include a first core piece 37A, a second core piece 37B, a third core piece 37C, and a fourth core piece 37D. That is, the rotor core 30 includes a first core piece 37A, a second core piece 37B, a third core piece 37C, and a fourth core piece 37D. The first core piece 37A and the second core piece 37B are separated by the first plate 80 in the axial direction. The first core piece 37A is located at a position closer to the other axial side (-Y side) than the second core piece 37B. The third core piece 37C is arranged on the other axial side of the first core piece 37A. The fourth core piece 37D is arranged on one axial side (+Y side) of the second core piece 37B.

[0061] The first core piece part 37A and the third core piece part 37C are arranged staggered with each other in the circumferential direction. The third core piece part 37C is arranged staggered to the other side (-θ side) in the circumferential direction relative to the first core piece part 37A. The second core piece part 37B and the fourth core piece part 37D are arranged staggered with each other in the circumferential direction. The fourth core piece part 37D is arranged staggered to the other side in the circumferential direction relative to the second core piece part 37B. The skewed torsion direction in the first core piece part 37A and the third core piece part 37C arranged on the other side (-Y side) of the axial direction of the first plate 80 is opposite to the skewed torsion direction in the second core piece part 37B and the fourth core piece part 37D arranged on the one side (+Y side) of the axial direction of the first plate 80 in the circumferential direction. Thus, the cogging torque and torque fluctuation can be reduced. The first core piece part 37A and the second core piece part 37B are located at the same position as each other in the circumferential direction. The third core piece portion 37C and the fourth core piece portion 37D are located at the same positions as each other in the circumferential direction.

[0062] In the present specification, “the core pieces 37 are arranged to be staggered in the circumferential direction” only requires that the circumferential positions of the magnetic pole pieces 10P described later are staggered between one core piece 37 and the other core piece 37. In the present specification, “the core pieces 37 are located at the same positions in the circumferential direction” only requires that the circumferential positions of the magnetic pole pieces 10P in one core piece 37 and the circumferential positions of the magnetic pole pieces 10P in the other core piece 37 are the same as each other.

[0063] like Figure 4 As shown, the rotor core 30 has a plurality of magnet retaining portions 31 arranged in a circumferential direction. The plurality of magnet retaining portions 31 are provided in the radially outer portion of the rotor core 30. The plurality of magnet retaining portions 31 are provided for each core piece portion 37. In each core piece portion 37 of each core piece portion 37, the plurality of magnet retaining portions 31 are arranged at equal intervals over the entire circumference in the circumferential direction. In the present embodiment, eight magnet retaining portions 31 are provided for each core piece portion 37. In addition, the number of magnet retaining portions 31 is not particularly limited.

[0064] The plurality of magnet holding parts 31 have magnet holes 50 in which the magnets 40 are arranged. In the present embodiment, a plurality of magnet holes 50 are provided in each magnet holding part 31. That is, the first core piece part 37A, the second core piece part 37B, the third core piece part 37C, and the fourth core piece part 37D each have a plurality of magnet holes 50. In the present embodiment, each magnet holding part 31 has a pair of first magnet holes 51a and 51b arranged at intervals from each other in the circumferential direction and a second magnet hole 52 located radially outside the pair of first magnet holes 51a and 51b as magnet holes 50. That is, the first core piece part 37A, the second core piece part 37B, the third core piece part 37C, and the fourth core piece part 37D each have a pair of first magnet holes 51a and 51b and a second magnet hole 52. In this way, in the present embodiment, a pair of first magnet holes 51a and 51b and a second magnet hole 52 are provided in each magnet holding part 31, totaling three magnet holes 50. In this embodiment, the pair of first magnet holes 51a, 51b and the second magnet hole 52 axially penetrate each core material part 37. Alternatively, the pair of first magnet holes 51a, 51b and the second magnet hole 52 may be holes having bottoms at the ends in the axial direction.

[0065] A magnet 40 is disposed in each of the three magnet holes 50 of each magnet holding portion 31. The type of the magnet 40 is not particularly limited. The magnet 40 may be, for example, a neodymium magnet or a ferrite magnet. The magnet 40 may be, for example, a rectangular parallelepiped that is long in the axial direction. The magnet 40 may extend from one axial end portion of the rotor core 30 to the other axial end portion.

[0066] The plurality of magnets 40 include a pair of first magnets 41a, 41b respectively located in a pair of first magnet holes 51a, 51b and a second magnet 42 located in a second magnet hole 52. Each magnet 40 is fixed in each magnet hole. There is no particular limitation on the method of fixing each magnet 40 in each magnet hole 50. For example, each magnet 40 may be fixed in each magnet hole 50 by caulking a portion of the rotor core 30, or may be fixed in each magnet hole 50 by using a resin filled in a portion other than a portion where the magnet 40 is arranged in each magnet hole 50, or may be fixed in each magnet hole 50 by using a foam sheet arranged in a portion other than a portion where the magnet 40 is arranged in each magnet hole 50.

[0067] The rotor 10 has a plurality of magnetic pole portions 10P arranged in a circumferential direction. In the present embodiment, eight magnetic pole portions 10P are provided for each core member portion 37. In addition, the number of magnetic pole portions 10P is not particularly limited. In each core member portion 37, a plurality of magnetic pole portions 10P are arranged at equal intervals throughout the entire circumference. In the present embodiment, each magnetic pole portion 10P is composed of a magnet retaining portion 31 and a plurality of magnets 40 arranged in a plurality of magnet holes 50 provided in a magnet retaining portion 31. The magnetic pole portions 10P respectively have a pair of first magnet holes 51a, 51b, a second magnet hole 52, a pair of first magnets 41a, 41b respectively located in the pair of first magnet holes 51a, 51b, and a second magnet 42 located in the second magnet hole 52.

[0068] In each core piece part 37, the plurality of magnetic pole parts 10P each include a plurality of magnetic pole parts 10N whose magnetic poles are N poles on the outer circumferential surface of the rotor core 30 and a plurality of magnetic pole parts 10S whose magnetic poles are S poles on the outer circumferential surface of the rotor core 30. In each core piece part 37 of the present embodiment, four magnetic pole parts 10N and four magnetic pole parts 10S are provided. The four magnetic pole parts 10N and the four magnetic pole parts 10S are arranged and alternately arranged in the circumferential direction. The magnetic pole parts 10N and the magnetic pole parts 10S have the same structure as each other except that the magnetic poles on the outer circumferential surface of the rotor core 30 are different and the circumferential positions are different.

[0069] like Figure 4 As shown, in the magnetic pole portion 10P, the first magnet hole 51a and the first magnet hole 51b are arranged with the first imaginary line Ld between them in the circumferential direction. The first imaginary line Ld is an imaginary line that passes through the circumferential center between the pair of first magnet holes 51a and 51b and extends in the radial direction. The first imaginary line Ld is a magnetic pole center line that passes through the circumferential center of the magnetic pole portion 10P. The circumferential center of the magnetic pole portion 10P is the circumferential center of the magnet holding portion 31. When viewed in the axial direction, the first imaginary line Ld passes through the center axis J. The first imaginary line Ld is set for each magnetic pole portion 10P. When viewed in the axial direction, the first imaginary line Ld passes through the d-axis of the rotor 10. The direction in which the first imaginary line Ld extends is the d-axis direction of the rotor 10. When viewed in the axial direction, the first magnet hole 51a and the first magnet hole 51b are arranged line-symmetrically with the first imaginary line Ld as the symmetry axis.

[0070] When viewed in the axial direction, the pair of first magnet holes 51a, 51b extend in a direction that separates from each other in the circumferential direction as they go from the radial inside to the radial outside. That is, the circumferential distance between the first magnet holes 51a and the first magnet holes 51b increases as they go from the radial inside to the radial outside. When viewed in the axial direction, the pair of first magnet holes 51a, 51b are arranged in a V-shape that expands in the circumferential direction as they go toward the radial outside.

[0071] The first magnet hole 51a has a magnet receiving hole portion 51c, an inner hole portion 51d, and an outer hole portion 51e. The magnet receiving hole portion 51c is a rectangular hole that is longer in the direction in which the first magnet hole 51a extends when viewed in the axial direction. The inner hole portion 51d is connected to the radially inner end of the end of the magnet receiving hole portion 51c in the direction in which the magnet receiving hole portion 51c extends when viewed in the axial direction. The outer hole portion 51e is connected to the radially outer end of the end of the magnet receiving hole portion 51c in the direction in which the magnet receiving hole portion 51c extends when viewed in the axial direction.

[0072] The first magnet hole 51b has a magnet receiving hole portion 51f, an inner hole portion 51g, and an outer hole portion 51h. The magnet receiving hole portion 51f is a rectangular hole that is longer in the direction in which the first magnet hole 51b extends when viewed in the axial direction. The inner hole portion 51g is connected to the radially inner end of the end of the magnet receiving hole portion 51f in the direction in which the magnet receiving hole portion 51f extends when viewed in the axial direction. The outer hole portion 51h is connected to the radially outer end of the end of the magnet receiving hole portion 51f in the direction in which the magnet receiving hole portion 51f extends when viewed in the axial direction.

[0073] like Figure 6 As shown, the inner hole portion 51d and the inner hole portion 51g are arranged at intervals in the circumferential direction across the first imaginary line Ld. When viewed in the axial direction, the inner hole portion 51d and the inner hole portion 51g are respectively in a roughly arc shape in which the edge of one side close to the other inner hole portion is recessed toward the other inner hole portion. The portion between the inner hole portion 51d and the inner hole portion 51g in the rotor core 30 in the circumferential direction is the bridge portion 39 located between the pair of first magnet holes 51a and 51b. The bridge portion 39 is located between the radial inner ends of the pair of first magnet holes 51a and 51b in the circumferential direction. The bridge portion 39 extends in the radial direction. The circumferential dimension of the radially outer portion of the bridge portion 39 increases as it goes toward the radially outer side. The circumferential dimension of the radially inner portion of the bridge portion 39 increases as it goes toward the radially inner side.

[0074] The pair of first magnets 41a, 41b disposed in the pair of first magnet holes 51a, 51b are disposed along a V-shape that expands circumferentially as it moves radially outward when viewed in the axial direction. The first magnet 41a is disposed in the magnet receiving hole portion 51c of the first magnet hole 51a. The first magnet 41b is disposed in the magnet receiving hole portion 51f of the first magnet hole 51b. The inner hole portions 51d, 51g and the outer hole portions 51e, 51h are, for example, hollow portions, and constitute magnetic isolation portions, respectively. In addition, the inner hole portions 51d, 51g and the outer hole portions 51e, 51h may be filled with non-magnetic materials such as resin, or the magnetic isolation portions may be constituted by each hole portion and a non-magnetic material such as resin filled in each hole portion. In addition, in this specification, a "magnetic isolation portion" is a portion that can suppress the flow of magnetic flux. That is, it is not easy for magnetic flux to pass through each magnetic isolation portion.

[0075] When viewed in the axial direction, the second magnet hole 52 extends linearly in a direction perpendicular to the first imaginary line Ld. The second magnet hole 52 is arranged at a position overlapping with the first imaginary line Ld when viewed in the axial direction. When viewed in the axial direction, the second magnet hole 52 is in a shape that is linearly symmetrical with the first imaginary line Ld as the axis of symmetry. In each magnetic pole portion 10P, when viewed in the axial direction, a pair of first magnet holes 51a, 51b and one second magnet hole 52 are arranged along a ▽ shape. The second magnet hole 52 is arranged between the circumferential directions of the pair of first magnet holes 51a, 51b. In more detail, the second magnet hole 52 is arranged between the circumferential directions of the outer hole portions 51e, 51h of the pair of first magnet holes 51a, 51b.

[0076] The second magnet hole 52 has a magnet receiving hole portion 52a and a pair of end holes 52b and 52c. The magnet receiving hole portion 52a is a rectangular hole that is longer in the direction in which the second magnet hole 52 extends when viewed in the axial direction. When viewed in the axial direction, a pair of end holes 52b and 52c are respectively connected to the two ends of the magnet receiving hole portion 52a in the direction in which the magnet receiving hole portion 52a extends. A pair of end holes 52b and 52c are separated from the magnet receiving hole portion 52a in the circumferential direction. The end hole portion 52b and the outer hole portion 51e are arranged adjacent to each other at a distance in the circumferential direction. The end hole portion 52c and the outer hole portion 51h are arranged adjacent to each other at a distance in the circumferential direction.

[0077] When viewed axially, the second magnet 42 arranged in the second magnet hole 52 extends linearly in a direction perpendicular to the first imaginary line Ld. The second magnet 42 is arranged at a position overlapping with the first imaginary line Ld when viewed axially. When viewed axially, the second magnet 42 is in a shape that is linearly symmetrical with the first imaginary line Ld as the axis of symmetry. In each magnetic pole portion 10P, when viewed axially, a pair of first magnets 41a, 41b and one second magnet 42 are arranged along a ▽ shape. The second magnet 42 is arranged in the magnet storage hole portion 52a. The end hole portions 52b, 52c are, for example, hollow portions, and respectively constitute magnetic isolation portions. In addition, the end hole portions 52b, 52c may be filled with non-magnetic materials such as resin, or the magnetic isolation portions may be constituted by each hole portion and a non-magnetic material such as resin filled in each hole portion.

[0078] In addition, in this specification, the "direction in which the magnet hole extends when viewed in the axial direction" refers to the direction in which the long side of the magnet receiving hole portion in the rectangular shape when viewed in the axial direction extends, for example, as in the first magnet holes 51a and 51b of the present embodiment, when the magnet receiving hole portion in which the magnet is received is in the rectangular shape when viewed in the axial direction. That is, for example, in the present embodiment, the "direction in which the first magnet hole 51a extends when viewed in the axial direction" refers to the direction in which the long side of the magnet receiving hole portion 51c in the rectangular shape when viewed in the axial direction extends.

[0079] The rotor core 30 has a core flow path portion 35. In the present embodiment, the core flow path portion 35 is located in a portion surrounded by a pair of first magnet holes 51a, 51b and a second magnet hole 52 when viewed in the axial direction. The core flow path portion 35 is located between the pair of first magnet holes 51a, 51b in the circumferential direction. Oil O as a refrigerant flows into the core flow path portion 35 via a flow path 70 described later. The core flow path portion 35 is located radially outward of the radially inner end portions of the pair of first magnets 41a, 41b, and radially inward of the second magnet 42. That is, in the present embodiment, a portion of the plurality of magnets 40 is located radially inward of the core flow path portion 35, and another portion of the plurality of magnets 40 is located radially outward of the core flow path portion 35. Therefore, the plurality of magnets 40 can be easily cooled appropriately by the oil O flowing in the core flow path portion 35.

[0080] Each of the plurality of magnet holding portions 31 provided in each core member portion 37 is provided with one core flow path portion 35. That is, each of the first core member portion 37A, the second core member portion 37B, the third core member portion 37C, and the fourth core member portion 37D has a plurality of core flow paths 35. Figure 7 As shown, the core flow path portion 35 extends in the axial direction. In the present embodiment, the core flow path portion 35 penetrates the core material portion 37 in the axial direction. In addition, the core flow path portion 35 may be a hole having a bottom in the axial direction.

[0081] like Figure 6 As shown, in the present embodiment, the core flow path portion 35 is arranged at a position overlapping with the first imaginary line Ld when viewed in the axial direction. When viewed in the axial direction, the core flow path portion 35 is in a shape that is line-symmetrical with the first imaginary line Ld as the axis of symmetry. In the present embodiment, when viewed in the axial direction, the core flow path portion 35 is in the shape of a long hole extending in a straight line in a direction perpendicular to the first imaginary line Ld. When viewed in the axial direction, the two circumferential ends of the core flow path portion 35 are in the shape of an arc that is recessed in the direction away from the first imaginary line Ld in the circumferential direction. The core flow path portion 35 is located between the bridge portion 39 and the radial direction of the second magnet hole 52. The core flow path portion 35 is configured to leave the bridge portion 39 radially outward. The circumferential dimension W5 of the core flow path portion 35 is larger than the circumferential dimension of the bridge portion 39. The two circumferential ends of the core flow path portion 35 protrude to both sides of the circumferential direction from the bridge portion 39.

[0082] The rotor core 30 has a hole portion 36 that overlaps with the second imaginary line Lq when viewed in the axial direction. The second imaginary line Lq is an imaginary line that passes through the center of the circumferentially adjacent magnetic pole portions 10P when viewed in the axial direction and extends in the radial direction. When viewed in the axial direction, the second imaginary line Lq passes through the center axis J. When viewed in the axial direction, the second imaginary line Lq passes on the q-axis of the rotor 10. The direction in which the second imaginary line Lq extends is the q-axis direction of the rotor 10. The second imaginary line Lq is provided between the magnet retaining portions 31. The direction in which the first imaginary line Ld extends and the direction in which the second imaginary line Lq extends are directions that intersect with each other. As Figure 4 As shown, the first imaginary lines Ld and the second imaginary lines Lq are alternately arranged along the circumferential direction.

[0083] A plurality of hole portions 36 are provided at intervals in the circumferential direction for each core member portion 37. In the present embodiment, eight hole portions 36 are provided for each core member portion 37. In the present embodiment, the hole portion 36 is a hole that penetrates the core member portion 37 in the axial direction. In addition, the hole portion 36 may also be a hole having a bottom in the axial direction. Each hole portion 36 is respectively arranged on the radial inner side between the magnet holding portions 31 adjacent to each other in the circumferential direction. Each hole portion 36 is located radially inner side of the first magnet hole 51a in the magnet holding portion 31 of one of the magnet holding portions 31 adjacent to each other in the circumferential direction and the first magnet hole 51b in the magnet holding portion 31 of the other side.

[0084] In the present embodiment, the hole portion 36 is roughly triangular in shape with rounded corners protruding radially outward when viewed in the axial direction. When viewed in the axial direction, the second imaginary line Lq passes through the circumferential center of the hole portion 36. In the present embodiment, when viewed in the axial direction, the hole portion 36 is linearly symmetrical with the second imaginary line Lq passing through the hole portion 36 as the axis of symmetry. The plurality of hole portions 36 are, for example, hollow portions, and each constitutes a magnetic isolation portion. In addition, the plurality of hole portions 36 may be filled with a non-magnetic material such as a resin, or the magnetic isolation portion may be constituted by each hole portion 36 and a non-magnetic material such as a resin filled in each hole portion 36. Figure 5 As shown, each hole portion 36 has a portion located at the same position as each second shaft hole portion 22b in the circumferential direction.

[0085] like Figure 7 As shown in FIG. 8 , the first plate 80 is disposed between the first core member 37A and the second core member 37B which are adjacently arranged in the axial direction. Figure 5 As shown, the first plate 80 is in the shape of a ring surrounding the shaft 20. More specifically, the first plate 80 is in the shape of a circular ring centered on the central axis J. The shaft 20 is embedded in the radial inner side of the first plate 80. The first plate 80 is in the shape of a plate with the plate surface facing the axial direction. The material constituting the first plate 80 is a non-magnetic body. Therefore, it is possible to suppress the generation of eddy currents in the first plate 80. As a result, compared with the case where the first plate 80 is made of a magnetic body, the loss caused by the eddy currents generated in the rotor 10 can be reduced. In the present embodiment, the material constituting the first plate 80 is different from the material constituting the first core piece part 37A and the material constituting the second core piece part 37B. The material constituting the first plate 80 is different from the electromagnetic steel plate. In the present embodiment, the material constituting the first plate 80 is an aluminum alloy. Aluminum alloys are easier to process than, for example, iron alloys. Therefore, by making the material constituting the first plate 80 an aluminum alloy, it is easy to reduce the cost of manufacturing the first plate 80 and to make the first plate 80 lightweight. The outer diameter of the first plate 80 is, for example, substantially the same as the outer diameter of the rotor core 30.

[0086] In the following description of the first plate 80, unless otherwise specified, the relative positional relationship between the various parts of the first plate 80 and the various parts of the magnetic pole portion 10P is the relative positional relationship between the various parts of the first plate 80 and the various parts of the magnetic pole portion 10P in the first core member portion 37A.

[0087] The first plate 80 has a plate flow path portion 81 that connects the second axial hole portion 22b and the core flow path portion 35. In the present embodiment, the plate flow path portion 81 is composed of a hole that penetrates the first plate 80 in the axial direction. The plate flow path portion 81 extends from the radial inner edge portion of the annular first plate 80 toward the radial outer side. The radial inner end of the plate flow path portion 81 is open on the radial inner side. A plurality of plate flow path portions 81 are arranged at intervals in the circumferential direction. The plurality of plate flow path portions 81 are arranged at equal intervals over the entire circumference. In the present embodiment, eight plate flow path portions 81 are provided.

[0088] like Figure 6 As shown, the plate flow path portion 81 has a supply flow path portion 82 overlapping with the core flow path portion 35 when viewed in the axial direction, and a connecting flow path portion 83 connecting the second axial hole portion 22b and the supply flow path portion 82. At least a portion of the oil O flowing in the first axial hole portion 22a flows from the second axial hole portion 22b through the connecting flow path portion 83 and the supply flow path portion 82 in sequence, and flows into the core flow path portion 35.

[0089] The connecting flow path portion 83 overlaps at least a portion of the pair of first magnet holes 51a and 51b when viewed in the axial direction. Therefore, unlike the case where the entire connecting flow path portion 83 does not overlap with the pair of first magnet holes 51a and 51b when viewed in the axial direction, it is not necessary to arrange the connecting flow path portion 83 away from the pair of first magnet holes 51a and 51b. Therefore, it is easy to increase the flow path width of the connecting flow path portion 83. Therefore, it is easy to increase the amount of oil O flowing in the connecting flow path portion 83, and it is easy to increase the amount of oil O supplied from the connecting flow path portion 83 to the core flow path portion 35 via the supply flow path portion 82. As a result, it is easy to appropriately cool the rotor core 30 with the oil O, and the cooling efficiency of the rotor 10 can be improved. The "flow path width in the connecting flow path portion 83" refers to the dimension of the connecting flow path portion 83 in a direction perpendicular to the direction in which the connecting flow path portion 83 extends when viewed in the axial direction.

[0090] For example, in order to reduce the loss caused by eddy current, when the first plate 80 is made of a non-magnetic body or an insulator and the axial dimension of the rotor 10 is constant, the amount of magnetic body in the rotor 10 is reduced in accordance with the provision of the first plate 80, and the magnetic characteristics of the rotor 10 are easily deteriorated. In contrast, in the present embodiment, since it is easy to increase the flow path width of the connecting flow path portion 83, it is easy to relatively reduce the axial dimension of the connecting flow path portion 83 while ensuring the same flow path cross-sectional area. As a result, it is easy to reduce the axial dimension T2 of the first plate 80 provided with the connecting flow path portion 83. Therefore, even if the first plate 80 is made of a non-magnetic body or an insulator, it is possible to suppress the reduction in the amount of magnetic body in the rotor 10. Therefore, it is possible to suppress the deterioration of the magnetic characteristics of the rotor 10.

[0091] In addition, in this specification, when “the connecting flow path portion overlaps with at least a portion of the pair of first magnet holes when viewed in the axial direction”, it is sufficient that at least one of the pair of first magnet holes has a portion that overlaps with the connecting flow path portion when viewed in the axial direction. In the present embodiment, when viewed in the axial direction, the connecting flow path portion 83 overlaps with a portion of the first magnet hole 51a and a portion of the first magnet hole 51b. In the present embodiment, a portion of the connecting flow path portion 83 overlaps with a portion of the first magnet holes 51a and 51b when viewed in the axial direction, so that the plate flow path portion 81 has a portion that overlaps with the magnet hole 50 when viewed in the axial direction.

[0092] In the present embodiment, the flow path width of the connecting flow path portion 83 is larger than the axial dimension T2 of the first plate 80. Therefore, it is easy to make the flow path width of the connecting flow path portion 83 larger, and it is easy to increase the amount of oil O flowing in the connecting flow path portion 83. As a result, the cooling efficiency of the rotor 10 can be further improved. In addition, it is easy to make the axial dimension T2 of the first plate 80 relatively smaller, so it is possible to further suppress the deterioration of the magnetic characteristics of the rotor 10.

[0093] like Figure 7 As shown, in this embodiment, the axial dimension T2 of the first plate 80 is smaller than the inner diameter D of the second shaft hole portion 22b. In other words, the inner diameter D of the second shaft hole portion 22b is larger than the axial dimension T2 of the first plate 80. Therefore, even if the axial position of the first plate 80 is offset relative to the shaft 20 due to assembly tolerance, etc., it is easy to connect the connecting flow path portion 83 to the second shaft hole portion 22b. The inner diameter D of the second shaft hole portion 22b is the axial dimension of the second shaft hole portion 22b and is the circumferential dimension of the second shaft hole portion 22b.

[0094] like Figure 6 As shown, the radial inner end of the connecting flow path portion 83 is located at the radial inner edge of the first plate 80. The radial inner end of the connecting flow path portion 83 opens radially inwardly and is radially opposite to the opening portion 22d of the second axial hole portion 22b. The radial inner end of the connecting flow path portion 83 is connected to the second axial hole portion 22b via the opening portion 22d. The connecting flow path portion 83 includes a first flow path portion 83a, a second flow path portion 83b, and a third flow path portion 83c.

[0095] The first flow path portion 83a extends radially outward from the radial inner edge portion of the first plate 80. In the present embodiment, the first flow path portion 83a extends in a straight line. The radial inner end of the first flow path portion 83a is the radial inner end of the connecting flow path portion 83. The radial inner end of the first flow path portion 83a is connected to the opening portion 22d of the second axial hole portion 22b. That is, the radial inner end of the first flow path portion 83a is the portion of the connecting flow path portion 83 connected to the second axial hole portion 22b. The flow path width W1 of the first flow path portion 83a becomes larger at the radial inner end. The flow path width W1 at the radial inner end of the first flow path portion 83a is larger than the inner diameter of the opening portion 22d of the second axial hole portion 22b. That is, the flow path width W1 at the portion of the connecting flow path portion 83 connected to the second axial hole portion 22b is larger than the inner diameter D of the second axial hole portion 22b. Therefore, the oil O can easily flow from the second axial hole portion 22 b into the connecting flow path portion 83 .

[0096] The first flow path portion 83a is located at a position closer to one side (+θ side) of the supply flow path portion 82 in the circumferential direction. Thus, the portion of the connecting flow path portion 83 connected to the second axial hole portion 22b is staggered to one side of the circumferential direction relative to the supply flow path portion 82. Therefore, compared with the case where the portion of the connecting flow path portion 83 connected to the second axial hole portion 22b and the supply flow path portion 82 are arranged at the same position in the circumferential direction, the degree of freedom when arranging each portion in the circumferential direction can be increased. Therefore, it is easy to arrange the portion of the connecting flow path portion 83 connected to the second axial hole portion 22b in the circumferential direction at a position different from the recessed portion 21 and the convex portion 84 described later, and it is easy to extend the plate flow path portion 81 to the core flow path portion 35 provided in the portion surrounded by the plurality of magnet holes 50. Furthermore, even when the circumferential position of the core flow path portion 35 is changed, it is easy to extend the plate flow path portion 81 from the second axial hole portion 22 b to the core flow path portion 35 without changing the circumferential positions of the recessed portion 21 and the convex portion 84 described later.

[0097] As described above, in the present embodiment, one circumferential side (+θ side) is the front side in the rotation direction of the rotor 10. That is, in the present embodiment, the portion of the connecting flow path portion 83 connected to the second shaft hole portion 22b is staggered relative to the supply flow path portion 82 toward the front side in the rotation direction of the rotor 10. Therefore, the supply flow path portion 82 is located at the rear side in the rotation direction of the rotor 10 relative to the portion of the connecting flow path portion 83 connected to the second shaft hole portion 22b. When the rotor 10 rotates, the oil O in the connecting flow path portion 83 easily flows to the rear side (-θ side) in the rotation direction of the rotor 10. Thus, the oil O in the connecting flow path portion 83 can flow to the rear side in the rotation direction of the rotor 10 and easily flow to the supply flow path portion 82.

[0098] When viewed in the axial direction, the first flow path portion 83a is located radially inside the hole portion 36. The first flow path portion 83a is arranged at a position overlapping with the second imaginary line Lq when viewed in the axial direction. The circumferential center of the first flow path portion 83a is offset to the other side (-θ side) in the circumferential direction relative to the second imaginary line Lq. The circumferential center of the first flow path portion 83a and the circumferential center of the hole portion 36 are offset from each other in the circumferential direction. The flow path width W1 of the portion other than the radially inner end of the first flow path portion 83a is larger than the inner diameter D of the hole body portion 22c of the second axial hole portion 22b.

[0099] The second flow path portion 83b extends from the radially outer end of the first flow path portion 83a to the other circumferential side (-θ side). In the present embodiment, the second flow path portion 83b is located radially outward as it moves toward the other circumferential side. Therefore, the oil O is pressed against the radially outer portion of the inner edge of the second flow path portion 83b by the centrifugal force generated by the rotation of the rotor 10, thereby making it easy for the oil O to flow radially outward along the edge of the second flow path portion 83b. Thus, it is easy for the oil O to flow into the second flow path portion 83b. In the present embodiment, the second flow path portion 83b extends in a straight line. When viewed in the axial direction, the end of the other circumferential side of the second flow path portion 83b overlaps with the first imaginary line Ld.

[0100] The third flow path portion 83c extends radially outward from the end portion of the second flow path portion 83b on the other circumferential side (-θ side). The third flow path portion 83c is connected to the supply flow path portion 82. By providing the first flow path portion 83a, the second flow path portion 83b, and the third flow path portion 83c in this way, the oil O flowing in the connecting flow path portion 83 can be appropriately guided to a position closer to the other circumferential side than the second shaft hole portion 22b, thereby easily guiding the oil O to the core flow path portion 35 located on the other circumferential side relative to the second shaft hole portion 22b. As a result, the oil O can be appropriately supplied to the core flow path portion 35, and the cooling efficiency of the rotor 10 can be further improved.

[0101] In the present embodiment, the third flow path portion 83c extends in a straight line. The third flow path portion 83c is arranged at a position overlapping with the first imaginary line Ld when viewed in the axial direction. When viewed in the axial direction, the circumferential center of the third flow path portion 83c is arranged on the first imaginary line Ld. When viewed in the axial direction, the third flow path portion 83c overlaps with the bridge portion 39. In the present embodiment, when viewed in the axial direction, the third flow path portion 83c overlaps with the entire bridge portion 39. The third flow path portion 83c extends from a position radially inward of the radial inner end portions of a pair of first magnet holes 51a, 51b to a position radially outward of the radial inner end portions of a pair of first magnet holes 51a, 51b. When viewed in the axial direction, the radially outer end portion of the third flow path portion 83c is located between the circumferential directions of the pair of first magnets 41a, 41b.

[0102] The third flow path portion 83c is located on the other side (-θ side) of the hole portion 36 in the circumferential direction when viewed in the axial direction. As described above, the first flow path portion 83a is located on the radially inner side of the hole portion 36 when viewed in the axial direction. By connecting the first flow path portion 83a and the third flow path portion 83c arranged in this way by using the second flow path portion 83b extending in the circumferential direction, the connecting flow path portion 83 can be appropriately arranged to avoid the hole portion 36. As a result, it is possible to suppress the oil O from leaking from the inside of the connecting flow path portion 83 into the hole portion 36. Therefore, it is possible to suppress the reduction in the amount of oil O supplied to the core flow path portion 35, and the cooling efficiency of the rotor 10 can be further improved.

[0103] When viewed in the axial direction, the third flow path portion 83c overlaps a portion of the pair of first magnet holes 51a, 51b. In the present embodiment, when viewed in the axial direction, the third flow path portion 83c overlaps the radially inner end portions of the pair of first magnet holes 51a, 51b. Therefore, compared with the case where the third flow path portion 83c is connected to the supply flow path portion 82 from the radial inner side and the third flow path portion 83c does not overlap with the pair of first magnet holes 51a, 51b when viewed in the axial direction, it is easy to increase the flow path width W3 of the third flow path portion 83c. Thus, it is easy to make the oil O flow appropriately from the radial inner side through the third flow path portion 83c to the core flow path portion 35 provided at a position surrounded by the pair of first magnet holes 51a, 51b and the second magnet hole 52.

[0104] In the present embodiment, when viewed in the axial direction, the radial center portion of the third flow path portion 83c overlaps with a portion of the inner hole portion 51d and a portion of the inner hole portion 51g. In the present embodiment, when viewed in the axial direction, the third flow path portion 83c overlaps with a corner portion of the radial inner corner portion of the pair of first magnets 41a, 41b on the side closer to the first imaginary line Ld in the circumferential direction.

[0105] In the present embodiment, the first flow path portion 83a, the second flow path portion 83b and the third flow path portion 83c are composed of holes that penetrate the first plate 80 in the axial direction. Thus, the first flow path portion 83a, the second flow path portion 83b and the third flow path portion 83c are arranged on the same plane perpendicular to the axial direction. Therefore, compared with the case where the first flow path portion 83a, the second flow path portion 83b and the third flow path portion 83c are staggered in the axial direction, the oil O can be easily flowed from the first flow path portion 83a to the third flow path portion 83c. In addition, for example, the first flow path portion 83a, the second flow path portion 83b and the third flow path portion 83c can be easily manufactured using the holes that penetrate the first plate 80 as in the present embodiment. Therefore, the connecting flow path portion 83 can be easily manufactured.

[0106] The flow path width W1 of the first flow path portion 83a, the flow path width W2 of the second flow path portion 83b, and the flow path width W3 of the third flow path portion 83c are different from each other. The flow path width W1 of the first flow path portion 83a is larger than the flow path width W2 of the second flow path portion 83b. Therefore, the first flow path portion 83a can be easily connected to the second axial hole portion 22b. In addition, the flow path width W2 of the second flow path portion 83b can be relatively small. Therefore, it is easy to ensure the strength of the first plate 80 compared with the case where the flow path width W2 of the second flow path portion 83b is large. Therefore, it is possible to appropriately suppress damage to the first plate 80 when the rotor 10 rotates at a high speed. In addition, since the second flow path portion 83b is connected to the radially outer end of the first flow path portion 83a, it is easy to withstand a larger centrifugal force than the first flow path portion 83a. Therefore, even if the flow path width W2 of the second flow path portion 83b is narrowed, it is not easy for the oil O to flow in the second flow path portion 83b. In addition, the flow velocity of the oil O can be increased more easily in the second flow path portion 83b than in the first flow path portion 83a. Thus, the oil O can be made to flow more appropriately in the second flow path portion 83b extending in the circumferential direction.

[0107] The flow path width W2 of the second flow path portion 83b is smaller than the flow path width W1 of the first flow path portion 83a and the flow path width W3 of the third flow path portion 83c. Therefore, it is easy to increase the flow velocity of the oil O in the second flow path portion 83b. As a result, it is easy to more appropriately flow the oil O in the second flow path portion 83b extending in the circumferential direction. In addition, the flow path width W3 of the third flow path portion 83c can be increased, and the oil O can be easily appropriately guided to the supply flow path portion 82. The flow path width W1 of the first flow path portion 83a is larger than the flow path width W3 of the third flow path portion 83c.

[0108] The flow path width W1 of the first flow path portion 83a is the dimension of the first flow path portion 83a in a direction perpendicular to the radial direction in which the first flow path portion 83a extends when viewed in the axial direction. The flow path width W2 of the second flow path portion 83b is the dimension of the second flow path portion 83b in a direction perpendicular to the direction in which the second flow path portion 83b extends when viewed in the axial direction. The flow path width W3 of the third flow path portion 83c is the dimension of the third flow path portion 83c in a direction perpendicular to the radial direction in which the third flow path portion 83c extends when viewed in the axial direction.

[0109] In addition, the flow path width W1 of the first flow path portion 83a, the flow path width W2 of the second flow path portion 83b, and the flow path width W3 of the third flow path portion 83c can be any size. For example, the flow path width W1 of the first flow path portion 83a, the flow path width W2 of the second flow path portion 83b, and the flow path width W3 of the third flow path portion 83c can also be the same as each other. In addition, for example, any two of the flow path widths W1 of the first flow path portion 83a, the flow path width W2 of the second flow path portion 83b, and the flow path width W3 of the third flow path portion 83c can be the same as each other, and the remaining one flow path width is different from the other two flow path widths.

[0110] The supply flow path portion 82 is connected to the radially outer end of the third flow path portion 83c. The circumferential dimension W4 of the supply flow path portion 82 is larger than the circumferential dimension of the portion of the third flow path portion 83c connected to the supply flow path portion 82, that is, the radially outer end of the third flow path portion 83c. Therefore, it is easy to increase the supply flow path portion 82 and to properly supply the oil O from the supply flow path portion 82 to the core flow path portion 35. In the present embodiment, the circumferential dimension of the third flow path portion 83c is the flow path width W3 of the third flow path portion 83c.

[0111] The circumferential dimension W4 of the supply flow path portion 82 is greater than the circumferential dimension W5 of the core flow path portion 35. In the present embodiment, the circumferential dimension W4 of the supply flow path portion 82 is greater than the circumferential dimension W5 of the core flow path portion 35. The circumferential dimension W5 of the core flow path portion 35 is greater than the flow path width W3 of the third flow path portion 83c. That is, the circumferential dimension of the portion of the third flow path portion 83c connected to the supply flow path portion 82 is smaller than the circumferential dimension W5 of the core flow path portion 35. Therefore, it is possible to prevent the flow path width W3 of the third flow path portion 83c from becoming too large. Thus, it is possible to prevent the area of ​​the first magnet holes 51a, 51b overlapping with the third flow path portion 83c when viewed in the axial direction from becoming too large. Furthermore, by making the circumferential dimension W4 of the supply flow path portion 82 larger than the circumferential dimension W5 of the core flow path portion 35, even if the flow path width W3 of the third flow path portion 83c is relatively narrow, the oil O can be easily supplied from the supply flow path portion 82 to the core flow path portion 35. The circumferential dimension W4 of the supply flow path portion 82 is the circumferential dimension of the largest portion of the supply flow path portion 82 in the circumferential direction.

[0112] The supply flow path portion 82 is arranged at a position overlapping with the first imaginary line Ld when viewed in the axial direction. In the present embodiment, the circumferential center of the supply flow path portion 82 is arranged on the first imaginary line Ld when viewed in the axial direction. When viewed in the axial direction, the supply flow path portion 82 is a shape that is line symmetrical with the first imaginary line Ld as the axis of symmetry. The radially outer portion of the inner edge of the supply flow path portion 82 has an extension portion 82a extending in a direction perpendicular to the first imaginary line Ld when viewed in the axial direction. When viewed in the axial direction, the extension portion 82a extends in a straight line. When viewed in the axial direction, the circumferential center of the extension portion 82a overlaps with the first imaginary line Ld.

[0113] When viewed in the axial direction, both ends of the radially outer portion of the supply flow path portion 82 in the circumferential direction are in an arc shape that is recessed in the direction away from the first imaginary line Ld in the circumferential direction. The circumferential dimension of the radially inner portion of the supply flow path portion 82 increases as it goes radially outward. When viewed in the axial direction, both ends of the radially inner portion of the supply flow path portion 82 in the circumferential direction extend linearly in a direction that separates from each other in the circumferential direction as it goes radially outward.

[0114] When viewed in the axial direction, the inner edge of the supply flow path portion 82 surrounds the core flow path portion 35. When viewed in the axial direction, the inner edge of the supply flow path portion 82 is disposed away from the inner edge of the core flow path portion 35 as a whole. The radial outer end of the supply flow path portion 82 is located radially outward from the radial outer end of the core flow path portion 35. Therefore, a portion of the supply flow path portion 82 can be disposed radially outward from the core flow path portion 35, and the oil O can be temporarily accumulated in this portion. As a result, the oil O temporarily accumulated in this portion flows into the core flow path portion 35, and the oil O is easily brought into contact with the radially outer portion of the axial end portion of the inner surface of the core flow path portion 35 on the side connected to the supply flow path portion 82. As a result, it is easy to appropriately increase the area of ​​the portion of the inner surface of the core flow path portion 35 that the oil O contacts. Therefore, the rotor core 30 can be cooled more appropriately, and the cooling efficiency of the rotor 10 can be further improved. In the present embodiment, the radial outer end of the supply flow path portion 82 is the extension portion 82a. The extending portion 82 a is arranged to be spaced apart from the core flow path portion 35 toward the radially outer side.

[0115] exist Figure 6, the core flow path portion 35 in the third core member portion 37C is indicated by a two-dot chain line. The core flow path portion 35 in the third core member portion 37C is arranged to be offset to the other side (-θ side) in the circumferential direction relative to the core flow path portion 35 in the first core member portion 37A. A portion of the core flow path portion 35 in the third core member portion 37C overlaps a portion of the core flow path portion 35 in the first core member portion 37A and a portion of the supply flow path portion 82 when viewed in the axial direction. Therefore, the oil O supplied from the supply flow path portion 82 to the core flow path portion 35 in the first core member portion 37A can be appropriately flowed from the core flow path portion 35 in the first core member portion 37A to the core flow path portion 35 in the third core member portion 37C. Therefore, the rotor core 30 can be easily cooled in a wide range in the axial direction by the oil O flowing in the core flow path portion 35. Therefore, the cooling efficiency of the rotor 10 can be further improved.

[0116] In this embodiment, a portion of the third core piece portion 37C on one circumferential side (+θ side) of the core flow path portion 35 overlaps with a portion of the first core piece portion 37A on one circumferential side of the core flow path portion 35 and a portion of the supply flow path portion 82 on one circumferential side when viewed in the axial direction.

[0117] like Figure 5 As shown, a radially protruding convex portion 84 is provided at the radial inner edge portion of the first plate 80. In the present embodiment, the convex portion 84 protrudes radially inward from the radial inner edge portion of the annular plate main body portion 80a surrounding the shaft 20 in the first plate 80. The plate main body portion 80a is in the shape of an annular ring centered on the central axis J. In the present embodiment, a pair of convex portions 84 are provided in the radial direction separated by the central axis J. When viewed in the axial direction, a pair of convex portions 84 overlap with a pair of convex portions 32, respectively. Each convex portion 84 is respectively engaged with each recess 21. As a result, the shaft 20 and the first plate 80 are hooked with each other in the circumferential direction, which inhibits the shaft 20 and the first plate 80 from rotating relative to each other in the circumferential direction. In the present embodiment, when viewed in the axial direction, the convex portion 84 is roughly quadrilateral.

[0118] like Figure 6 As shown in the figure, the convex portion 84 and the concave portion 21 into which the convex portion 84 fits are located at different positions from the first flow path portion 83a in the circumferential direction. That is, the portion of the connecting flow path portion 83 connected to the second axial hole portion 22b is located at different positions from the concave portion 21 and the convex portion 84 in the circumferential direction. Therefore, the connecting flow path portion 83 can be arranged avoiding the concave portion 21 and the convex portion 84 in the circumferential direction, and the connecting flow path portion 83 can be easily connected to the second axial hole portion 22b appropriately.

[0119] The recessed portion 21 and the convex portion 84 are located radially inside the supply flow path portion 82. The recessed portion 21 and the convex portion 84 have portions located at the same position as the supply flow path portion 82 in the circumferential direction. Therefore, compared with the case where the recessed portion 21 and the convex portion 84 are arranged circumferentially staggered relative to the entire supply flow path portion 82, it is easy to reduce the circumferential spacing between the plate flow path portions 81 arranged circumferentially with the recessed portion 21 and the convex portion 84 therebetween. As a result, it is easy to increase the number of the plurality of plate flow path portions 81 arranged circumferentially with intervals therebetween, and the rotor core 30 can be cooled more easily. Therefore, the cooling efficiency of the rotor 10 can be further improved.

[0120] When viewed in the axial direction, the imaginary line LI that passes through the circumferential center of the convex portion 84 and the circumferential center of the concave portion 21 and extends in the radial direction is offset to the other side (-θ side) in the circumferential direction relative to the first imaginary line Ld. As described above, when viewed in the axial direction, the first imaginary line Ld passes through the circumferential center of the supply flow path portion 82. That is, in the present embodiment, the circumferential center of the supply flow path portion 82 is circumferentially offset relative to the circumferential center of the concave portion 21 and the circumferential center of the convex portion 84. Therefore, the convex portion 32 of the rotor core 30 that overlaps with the convex portion 84 in the axial direction can be arranged at a position that is circumferentially offset relative to the core flow path portion 35 connected to the supply flow path portion 82. Thus, when the plate member 30a having the same shape as the plate member 30a constituting the first core member 37A is reversed in the axial direction and the portion constituting the protrusion 32 provided on the plate member 30a is arranged to overlap with the protrusion 32 of the first core member 37A in the axial direction, the portion constituting the magnetic pole portion 10P provided on the plate member 30a can be arranged to be offset in the circumferential direction relative to the magnetic pole portion 10P of the first core member 37A. Therefore, using the plate member 30a having the same shape, the first core member 37A and the third core member 37C can be manufactured in which the circumferential positions of the protrusions 32 are the same and the magnetic pole portions 10P are offset in the circumferential direction. Therefore, the types of molds used to manufacture the plate member 30a can be easily reduced, thereby suppressing an increase in the manufacturing cost for manufacturing the rotor core 30.

[0121] The axial dimension T2 of the first plate 80 is 5% or less of the axial dimension T1 of the rotor core 30. Therefore, it is easy to appropriately reduce the size of the first plate 80 in the axial direction. Thus, by making the first plate 80 a non-magnetic material as in the present embodiment, it is possible to reduce the loss caused by the eddy current, and it is possible to suppress the reduction in the amount of magnetic material in the rotor 10, and it is possible to suppress the deterioration of the magnetic characteristics of the rotor 10. In addition, the axial dimension T2 of the first plate 80 is not particularly limited.

[0122] The second plate 90 is disposed at least one of the axial direction between the first core member 37A and the first plate 80 and the axial direction between the second core member 37B and the first plate 80. Figure 7As shown, in the present embodiment, the second plate 90 is disposed between the first core member 37A and the first plate 80 in the axial direction and between the second core member 37B and the first plate 80 in the axial direction. The two second plates 90 have the same shape as each other. In the following description, the two second plates 90 are used as representatives, and the second plate 90 located between the first core member 37A and the first plate 80 in the axial direction is described, and the description of the other second plate 90 is sometimes omitted.

[0123] The second plate 90 is in the shape of a plate with its surface facing the axial direction. Figure 8 As shown, the second plate 90 is in the shape of a ring surrounding the shaft 20. More specifically, the second plate 90 is in the shape of a substantially circular ring centered on the central axis J. The shaft 20 is fitted radially inside the second plate 90. The outer diameter of the second plate 90 is, for example, the same as the outer diameter of the rotor core 30. In the present embodiment, the entire radial outer edge of the second plate 90 is located radially outward of the radial outer edge of all the magnet holes 50.

[0124] The second plate 90 has a through hole 95 that penetrates the second plate 90 in the axial direction. In the present embodiment, a plurality of through holes 95 are provided at intervals from each other in the circumferential direction. The plurality of through holes 95 are arranged at equal intervals throughout the entire circumference in the circumferential direction. In the present embodiment, eight through holes 95 are provided.

[0125] In the present embodiment, the through hole 95 is provided at a position overlapping with the first imaginary line Ld when viewed in the axial direction. When viewed in the axial direction, the through hole 95 is in a shape that is line symmetrical with the first imaginary line Ld as the axis of symmetry. In the present embodiment, when viewed in the axial direction, the through hole 95 is in the shape of a long hole extending in a straight line in a direction perpendicular to the first imaginary line Ld. When viewed in the axial direction, both ends of the through hole 95 in the circumferential direction are in a substantially arc shape that is concave in the direction away from the first imaginary line Ld in the circumferential direction.

[0126] like Figure 6 As shown, when viewed along the axial direction, the through hole 95 overlaps with the core flow path portion 35 and the supply flow path portion 82, and is arranged at a position different from the magnet hole 50. Therefore, the core flow path portion 35 and the supply flow path portion 82 can be connected through the through hole 95. As a result, the oil O in the plate flow path portion 81 can flow from the supply flow path portion 82 to the core flow path portion 35 through the through hole 95. In addition, the oil O flowing in the through hole 95 can be suppressed from flowing into the magnet hole 50. As shown in FIG. Figure 7As shown, in this embodiment, the supply flow path portion 82 is connected to the core flow path portion 35 provided in the first core member portion 37A through the through hole 95 of the second plate 90 located between the first core member portion 37A and the first plate 80. The supply flow path portion 82 is connected to the core flow path portion 35 provided in the second core member portion 37B through the through hole 95 of the second plate 90 located between the second core member portion 37B and the first plate 80.

[0127] like Figure 6 As shown, in the cross section perpendicular to the axial direction, the cross-sectional area of ​​the through hole 95 is larger than the cross-sectional area of ​​the core flow path portion 35. Therefore, even if the circumferential position of the second plate 90 is offset due to assembly tolerance or the like, it is easy to arrange the through hole 95 so as to overlap with the core flow path portion 35 in the axial direction. As a result, it is easy to guide the oil O in the plate flow path portion 81 into the core flow path portion 35 via the through hole 95. In addition, compared with the case where the cross-sectional area of ​​the core flow path portion 35 is larger than the cross-sectional area of ​​the through hole 95 in the cross section perpendicular to the axial direction, it is easy to reduce the cross-sectional area of ​​the core flow path portion 35 provided in the rotor core 30. Therefore, it is possible to suppress the reduction in the rigidity of the rotor core 30. In addition, compared with the case where the cross-sectional area of ​​the core flow path portion 35 is large, it is possible to suppress the reduction in the amount of magnetic body in the rotor 10, so it is possible to suppress the reduction in the magnetic characteristics of the rotor 10.

[0128] When viewed in the axial direction, the inner edge of the through hole 95 surrounds the core flow path portion 35. The inner edge of the through hole 95 is configured as a whole to be separated from the core flow path portion 35 when viewed in the axial direction. The inner edge of the through hole 95, except for the portion located on the radial inner side, roughly overlaps with the inner edge of the supply flow path portion 82 as a whole when viewed in the axial direction. The radial outer edge portion of the through hole 95 is located radially outward of the radial outer edge portion of the core flow path portion 35. The circumferential dimension W6 of the through hole 95 is greater than the circumferential dimension W5 of the core flow path portion 35. In the present embodiment, the circumferential dimension W6 of the through hole 95 is larger than the circumferential dimension W5 of the core flow path portion 35 and is the same as the circumferential dimension W4 of the supply flow path portion 82.

[0129] like Figure 7 As shown, in the present embodiment, the radial outer edge of the through hole 95 is located at the same radial position as the radial outer edge of the supply flow path portion 82. Therefore, unlike the case where the radial outer edge of the supply flow path portion 82 is located radially outward of the radial outer edge of the through hole 95, the oil O that has flowed into the supply flow path portion 82 and contacts the radial outer edge of the supply flow path portion 82 is easily allowed to flow toward the through hole 95. Thus, it is possible to suppress the oil O from stagnating at the radial outer edge of the supply flow path portion 82, and to facilitate the oil O to flow from the supply flow path portion 82 into the core flow path portion 35 via the through hole 95.

[0130] like Figure 8As shown, at least a portion of the second plate 90 is axially opposed to at least a portion of the magnet hole 50. Therefore, at least a portion of the magnet hole 50 can be covered and closed by the second plate 90. As a result, the oil O as a fluid flowing in the plate flow path portion 81 provided in the first plate 80 can be prevented from flowing into the magnet hole 50. Therefore, the deviation in mass generated in the rotor 10 can be prevented, and the vibration of the rotor 10 can be prevented from increasing. Therefore, the noise generated from the rotating electric machine 60 can be prevented.

[0131] In addition, for example, when the plate flow path section is made by making the recessed portions provided in the two plates face each other in the axial direction, the oil O is blocked by the two plates, and the oil O may not easily flow from the plate flow path section into the magnet hole 50. However, in this case, if an axial force is applied to the two plates in a direction of pressing each other when assembling the core material parts 37, the portion of the plate where the recessed portion is provided may be deformed, and the plate may be damaged. In addition, the oil O flowing radially outward in the plate flow path section may leak from the mating surface of the two plates provided at the radially outer end of the plate flow path section.

[0132] In contrast, according to the present embodiment, by providing the second plate 90 separately from the first plate 80 provided with the plate flow path portion 81, even if a force in a direction of pressing against each other is applied to the first plate 80 and the second plate 90, the force can be easily distributed and received by the entire first plate 80. Therefore, it is possible to suppress damage to the first plate 80 provided with the plate flow path portion 81. In addition, since the mating surface between the two plates as described above is not provided at the radially outer end of the plate flow path portion 81, it is possible to suppress leakage of the oil O flowing in the plate flow path portion 81.

[0133] In the present embodiment, the second plate 90 is axially opposed to the portion of the magnet hole 50 that overlaps with the plate flow path portion 81 when viewed in the axial direction. Therefore, the plate flow path portion 81 can be overlapped with at least a portion of the magnet hole 50 in the axial direction to ensure the flow path cross-sectional area of ​​the plate flow path portion 81, and the oil O in the plate flow path portion 81 can be appropriately suppressed by the second plate 90 from leaking to the portion of the magnet hole 50 that overlaps with the plate flow path portion 81 in the axial direction. In the present embodiment, the second plate 90 is axially opposed to the radially inner end portions of the pair of first magnet holes 51a, 51b that overlap with the plate flow path portion 81 in the axial direction.

[0134] In addition, as described above, in the present embodiment, a part of the plurality of magnets 40 is located radially inward of the core flow path portion 35, and another part of the plurality of magnets 40 is located radially outward of the core flow path portion 35. When the core flow path portion 35 is arranged relative to the plurality of magnets 40 in this manner, the core flow path portion 35 is arranged to be surrounded by the plurality of magnets 40 when viewed in the axial direction, as in the present embodiment, etc., the oil O flowing from the second axial hole portion 22b to the core flow path portion 35 is likely to pass through a position close to the magnet hole 50. Even in such a case, according to the present embodiment, by providing the second plate 90, it is possible to appropriately suppress the oil O from flowing into the magnet hole 50.

[0135] As described above, in the present embodiment, the second plate 90 is disposed both between the first core member 37A and the first plate 80 in the axial direction and between the second core member 37B and the first plate 80 in the axial direction. Therefore, the two second plates 90 can appropriately suppress the oil O from flowing into the magnet hole 50 provided in the first core member 37A and the magnet hole 50 provided in the second core member 37B.

[0136] like Figure 7 As shown, the second plate 90 located between the first core member 37A and the first plate 80 is axially opposed to at least a portion of the magnet hole 50 provided in the first core member 37A, and covers and closes at least a portion of the magnet hole 50 provided in the first core member 37A from one axial side (+Y side). In the present embodiment, the second plate 90 located between the first core member 37A and the first plate 80 is axially opposed to the entirety of all the magnet holes 50 provided in the first core member 37A, and covers and closes the entirety of all the magnet holes 50 provided in the first core member 37A from one axial side. Therefore, the oil O flowing in the plate flow path portion 81 can be appropriately suppressed from flowing into the magnet hole 50 provided in the first core member 37A by one second plate 90.

[0137] The second plate 90 located between the second core member 37B and the first plate 80 is axially opposed to at least a portion of the magnet hole 50 provided in the second core member 37B, and covers and closes at least a portion of the magnet hole 50 provided in the second core member 37B from the other axial side (-Y side). In the present embodiment, the second plate 90 located between the second core member 37B and the first plate 80 is axially opposed to the entirety of all the magnet holes 50 provided in the second core member 37B, and covers and closes the entirety of all the magnet holes 50 provided in the second core member 37B from the other axial side. Therefore, the oil O flowing in the plate flow path portion 81 can be appropriately suppressed from flowing into the magnet hole 50 provided in the second core member 37B by the other second plate 90.

[0138] like Figure 8As shown, a portion of the second plate 90 is axially opposed to at least a portion of the hole 36. Therefore, at least a portion of the hole 36 can be covered and closed by the second plate 90. As a result, the oil O flowing in the plate flow path 81 provided in the first plate 80 can be prevented from flowing into the hole 36. Therefore, the occurrence of mass deviation in the rotor 10 can be further suppressed, and the increase in vibration of the rotor 10 can be further suppressed. As a result, the generation of noise from the rotary electric machine 60 can be further suppressed.

[0139] In the present embodiment, the second plate 90 located between the first core member 37A and the first plate 80 is axially opposed to the entirety of all the holes 36 provided in the first core member 37A, and covers and closes the entirety of all the holes 36 provided in the first core member 37A from one axial side (+Y side). Therefore, the oil O can be appropriately suppressed from flowing into the holes 36 provided in the first core member 37A by the single second plate 90.

[0140] In the present embodiment, the second plate 90 located between the second core member 37B and the first plate 80 is opposed to the entirety of all the holes 36 provided in the second core member 37B in the axial direction, and covers and closes the entirety of all the holes 36 provided in the second core member 37B from the other axial side (-Y side). Therefore, the other second plate 90 can appropriately suppress the oil O from flowing into the holes 36 provided in the second core member 37B.

[0141] like Figure 7 As shown, the axial dimension T3 of the second plate 90 is smaller than the axial dimension T2 of the first plate 80. In other words, the axial dimension T2 of the first plate 80 is larger than the axial dimension T3 of the second plate 90. Therefore, it is easy to increase the flow path cross-sectional area of ​​the plate flow path portion 81 provided in the first plate 80. As a result, the amount of oil O flowing in the plate flow path portion 81 can be appropriately increased. Therefore, it is easy to cool the rotor 10 more appropriately. In addition, by making the second plate 90 thinner than the first plate 80 in the axial direction, the cost for manufacturing the second plate 90 can be reduced. Even if the second plate 90 is made thinner in the axial direction, as described above, by covering the magnet hole 50 with the second plate 90, it is possible to suppress the oil O from flowing into the magnet hole 50.

[0142] In the present embodiment, the material constituting the first plate 80 and the material constituting the second plate 90 are different from each other. Therefore, the first plate 80 and the second plate 90 having different axial dimensions can be manufactured using appropriate materials, respectively. As a result, the cost of manufacturing each plate can be reduced while the function of each plate can be easily and appropriately ensured. Regarding "the material constituting the first plate 80 and the material constituting the second plate 90 are different from each other", for example, it includes a case where the type of material constituting the first plate 80 and the type of material constituting the second plate 90 are different from each other, a case where the density of the material constituting the first plate 80 and the density of the material constituting the second plate 90 are different from each other, and a case where the Young's modulus of the material constituting the first plate 80 and the Young's modulus of the material constituting the second plate 90 are different from each other.

[0143] In the present embodiment, the material constituting the second plate 90 is an iron alloy. Therefore, the strength of the material constituting the second plate 90 is higher than that of the aluminum alloy constituting the first plate 80. Thus, even if the second plate 90 is made thinner than the first plate 80 in the axial direction, it is easy to appropriately ensure the strength of the second plate 90.

[0144] In the present embodiment, the material constituting the first plate 80 and the material constituting the second plate 90 are different from the material constituting the first core member 37A and the material constituting the second core member 37B. That is, the material constituting the first plate 80 and the material constituting the second plate 90 are different from the material of the plate member 30a, that is, the electromagnetic steel sheet. Therefore, it is easy to make the magnetic permeability of the first plate 80 and the magnetic permeability of the second plate 90 smaller than the magnetic permeability of the first core member 37A and the magnetic permeability of the second core member 37B constituted of the electromagnetic steel sheet. Therefore, even if the plates without the magnets 40 are arranged between the first core member 37A and the second core member 37B, the flow of magnetic flux is not easily blocked by the plates, and the deterioration of the magnetic characteristics of the rotor 10 can be suppressed.

[0145] In the present embodiment, the number of the core pieces 37 located on one side (+Y side) of the first plate 80 and the second plate 90 and the number of the core pieces 37 located on the other side (-Y side) of the first plate 80 and the second plate 90 are equal to each other. Therefore, the first plate 80 and the second plate 90 are easily located at the central part of the axial direction of the rotor 10 or a position close to the central part. Here, the flow of magnetic flux is likely to be larger in the central part of the axial direction of the rotor 10 than in the end parts of the axial direction of the rotor 10. Therefore, when the first plate 80 and the second plate 90 are located at the central part of the axial direction of the rotor 10 or a position close to the central part, if each plate is made of the same material as the material constituting the core pieces 37, the flow of magnetic flux is likely to be blocked by each plate. In contrast, in the present embodiment, as described above, by making the material constituting each plate different from the material constituting each core piece 37, the flow of magnetic flux is less likely to be blocked by each plate. Therefore, the first plate 80 and the second plate 90 can be arranged at the central portion or a position close to the central portion in the axial direction of the rotor 10, and it is possible to suppress the reduction in the magnetic characteristics of the rotor 10. In addition, by arranging the first plate 80 provided with the plate flow path portion 81 at the central portion or a position close to the central portion in the axial direction of the rotor 10, the central portion in the axial direction of the rotor 10, which is prone to heat because the amount of magnetic flux flowing is larger than that in the end portions in the axial direction, can be easily cooled appropriately with the oil O.

[0146] like Figure 1 As shown, in the present embodiment, the axial center between the axial center of the rotor core 30 and the end portion on one axial side (+Y side) of the rotor core 30 is set as the first center C1, and the axial center between the axial center of the rotor core 30 and the end portion on the other axial side (-Y side) of the rotor core 30 is set as the second center C2. In the present embodiment, the first center C1 is located at substantially the same position as the boundary portion between the second core member 37B and the fourth core member 37D in the axial direction. In the present embodiment, the second center C2 is located at substantially the same position as the boundary portion between the first core member 37A and the third core member 37C in the axial direction.

[0147] In the present embodiment, the first plate 80 and the second plate 90 are located between the first center C1 and the second center C2 in the axial direction. Therefore, the first plate 80 and the second plate 90 are easily located at the central portion or a position close to the central portion in the axial direction of the rotor 10. As described above, by making the material constituting each plate different from the material constituting each core member portion 37, the flow of magnetic flux is not easily blocked by each plate even if each plate is arranged at the central portion or a position close to the central portion in the axial direction of the rotor 10. Therefore, it is possible to suppress the reduction of the magnetic characteristics of the rotor 10 while appropriately cooling the rotor 10 by arranging each plate at the central portion or a position close to the central portion in the axial direction of the rotor 10.

[0148] like Figure 8As shown, the second plate 90 has an annular second plate main body 91 surrounding the shaft 20 and a convex portion 92 protruding radially inward from the inner edge of the second plate main body 91. The convex portion 92 overlaps with the convex portion 32 provided on the rotor core 30 in the axial direction. A pair of convex portions 92 are provided in the radial direction across the center axis J. The pair of convex portions 92 are respectively fitted into a pair of concave portions 21. As a result, the shaft 20 and the second plate 90 are hooked with each other in the circumferential direction, and the shaft 20 and the second plate 90 are inhibited from rotating relative to each other in the circumferential direction. When viewed in the axial direction, the convex portion 92 is substantially quadrilateral.

[0149] A pair of first recessed portions 93a, 93b and a second recessed portion 94 recessed radially outward are provided at the inner edge of the second plate main body 91. Two pairs of the first recessed portions 93a, 93b are provided in the radial direction across the center axis J. Each pair of first recessed portions 93a, 93b is adjacent to both sides of each convex portion 92 in the circumferential direction and is provided across each convex portion 92 in the circumferential direction. Each first recessed portion 93a, 93b overlaps with each first recessed portion 33a, 33b in the axial direction. A pair of second recessed portions 94 is provided across the center axis J in the radial direction. The pair of second recessed portions 94 is arranged in a manner across the center axis J in a radial direction perpendicular to the radial direction of the pair of convex portions 92 across the center axis J when viewed in the axial direction. The pair of second recessed portions 94 extends in the circumferential direction. Each second recessed portion 94 overlaps with each second recessed portion 34 in the axial direction. By providing the first recessed portions 93a, 93b and the second recessed portion 94, for example, even when the shaft 20 is press-fitted into the second plate main body 91, a portion of the stress generated in the shaft 20 can be released at a portion of the shaft 20 that is radially opposed to the first recessed portions 93a, 93b and the second recessed portion 94. Therefore, the shaft 20 can be easily press-fitted into the second plate main body 91.

[0150] Alternatively, a recessed portion may be provided on the inner edge of the second plate body 91 instead of the protruding portion 92, and a protruding portion that fits into the recessed portion provided on the inner edge of the second plate body 91 may be provided on the outer circumferential surface of the shaft 20 instead of the recessed portion 21. Even in this case, the shaft 20 and the second plate 90 can be prevented from rotating relative to each other in the circumferential direction.

[0151] The relative positional relationship of the first plate 80 and the second plate 90 with respect to the second core piece portion 37B and the fourth core piece portion 37D is the same as the relative positional relationship of the first plate 80 and the second plate 90 with respect to the first core piece portion 37A and the third core piece portion 37C described above, except that the second core piece portion 37B and the fourth core piece portion 37D are axially symmetrically arranged with the first core piece portion 37A and the third core piece portion 37C separated in the axial direction by the first plate 80 and the second plate 90.

[0152] like Figure 1As shown, in this embodiment, a flow path 70 for flowing oil O as a refrigerant is provided in the driving device 100. In this embodiment, the flow path 70 is a flow path for supplying the oil O stored in the gear housing 63b to the rotor 10 and the stator 61. A pump 76 and a cooler 77 are provided in the flow path 70. The pump 76 is an electric pump. The flow path 70 includes a flow path portion 71, a flow path portion 72, a flow path portion 73, a flow path portion 74, and a flow path portion 75.

[0153] The flow path portion 71, the flow path portion 72, and the flow path portion 73 are provided, for example, on the wall portion of the gear housing 63b. The flow path portion 71 connects the portion of the gear housing 63b in which the oil O is stored to the pump 76. The flow path portion 72 connects the pump 76 to the cooler 77. The flow path portion 73 connects the cooler 77 to the flow path portion 74. In the present embodiment, the flow path portion 73 is connected to the end portion of the flow path portion 74 on one axial side (+Y side), that is, the upstream side portion of the flow path portion 74.

[0154] In the present embodiment, the flow path portion 74 is in the shape of a tube extending in the axial direction. In other words, in the present embodiment, the flow path portion 74 is a tube extending in the axial direction. Both axial ends of the flow path portion 74 are supported by the motor housing 63a. The end on one axial side (+Y side) of the flow path portion 74 is supported by, for example, the partition wall portion 63d. The end on the other axial side (-Y side) of the flow path portion 74 is supported by, for example, the cover portion 63e. The flow path portion 74 is located radially outside the stator 61. In the present embodiment, the flow path portion 74 is located on the upper side of the stator 61.

[0155] The flow path portion 74 has a supply port 74a for supplying the oil O to the stator 61. In the present embodiment, the supply port 74a is an injection port for injecting a portion of the oil O flowing into the flow path portion 74 to the outside of the flow path portion 74. The supply port 74a is composed of a hole penetrating the wall portion of the flow path portion 74 from the inner peripheral surface to the outer peripheral surface. A plurality of supply ports 74a are provided in the flow path portion 74.

[0156] The flow path portion 75 connects the flow path portion 74 to the inside of the hollow shaft 20. More specifically, the flow path portion 75 connects the end portion on the other axial side (-Y side) of the flow path portion 74 to the end portion on the other axial side of the shaft 20. In the present embodiment, the flow path portion 75 is provided on the cover portion 63e.

[0157] like Figure 1 As shown in FIG. 1 , when the pump 76 is driven, the oil O stored in the gear housing 63b is sucked up through the flow path portion 71 and flows into the cooler 77 through the flow path portion 72. The oil O flowing into the cooler 77 is cooled in the cooler 77 and then flows to the flow path portion 74 through the flow path portion 73. A portion of the oil O flowing into the flow path portion 74 is ejected from the supply port 74a and supplied to the stator 61. Another portion of the oil O flowing into the flow path portion 74 flows into the first shaft hole portion 22a through the flow path portion 75.

[0158] like Figure 7 As shown, the oil O flowing from the flow path portion 75 into the first axial hole portion 22a flows toward one side in the axial direction (toward the +Y side) in the first axial hole portion 22a. A portion of the oil O flowing inside the first axial hole portion 22a flows from the first flow path portion 83a into the connecting flow path portion 83 via the second axial hole portion 22b. The oil O flowing into the connecting flow path portion 83 flows through the first flow path portion 83a, the second flow path portion 83b, and the third flow path portion 83c in sequence, and flows into the supply flow path portion 82. The oil O flowing into the supply flow path portion 82 branches to both sides in the axial direction, and flows into each core flow path portion 35 provided in the first core member portion 37A and each core flow path portion 35 provided in the second core member portion 37B respectively through the through holes 95 of each second plate 90. The oil O flowing in the core flow path portion 35 provided in the first core member portion 37A flows into the core flow path portion 35 provided in the third core member portion 37C. The oil O flowing in the core flow path portion 35 provided in the second core member portion 37B flows into the core flow path portion 35 provided in the fourth core member portion 37D. Figure 1 As shown, the oil O flowing into the core flow path portion 35 provided in the third core member portion 37C and the oil O flowing into the core flow path portion 35 provided in the fourth core member portion 37D are scattered radially outward from the axial end portion of the rotor core 30 toward the stator 61 .

[0159] Another part of the oil O flowing inside the shaft 20 is discharged into the gear housing 63b and stored again in the gear housing 63b. The oil O supplied to the stator 61 from the supply port 74a and the core flow path portion 35 falls downward and accumulates in the lower area of ​​the motor housing 63a. The oil O accumulated in the lower area of ​​the motor housing 63a returns to the gear housing 63b through the partition wall opening 63f provided in the partition wall portion 63d. In addition, the flow path 70 may have any structure as long as it is a structure capable of supplying the oil O to the rotor 10.

[0160] Hereinafter, embodiments different from the above-described embodiments will be described. In the description of each of the following embodiments, for the same structure as that described in the upper paragraph of the description of each embodiment, the same reference numerals are sometimes appropriately marked and the description is omitted. In addition, for the parts corresponding to the parts of the structure described in the upper paragraph of the description of each embodiment, the same names are marked and different reference numerals are marked to explain the points different from the above-described structure, and the description of the same points as the above-described structure is sometimes omitted. In addition, as the structure omitted from description in each of the following embodiments, the same structure as that described in the upper paragraph of the description of each embodiment can be adopted within the scope of non-contradiction.

[0161] <Second embodiment>

[0162] like Fig. 9 As shown, in the second plate 290 of the rotor 210 of the present embodiment, the radial outer edge of the through hole 295 is located radially outward from the radial outer edge of the supply flow path portion 82. Even in this case, it is possible to suppress the oil O from stagnating at the radial outer edge of the supply flow path portion 82, and the oil O can easily flow from the supply flow path portion 82 into the core flow path portion 35 through the through hole 295. The other structures of the second plate 290 are the same as those of the second plate 90 in the first embodiment. The other structures of the rotor 210 are the same as those of the rotor 10 in the first embodiment.

[0163] <Third embodiment>

[0164] like Fig.10 As shown, in the rotor 310 of the present embodiment, the radial outer edge portion 396 of the second plate 390 has a first outer edge portion 396a and a second outer edge portion 396b. The first outer edge portion 396a is located at a radially inner position than the second outer edge portion 396b. In the present embodiment, the second outer edge portion 396b is located at the same position in the radial direction as the radially outer surface of the rotor core 30. A plurality of the first outer edge portion 396a and the second outer edge portion 396b are provided. The first outer edge portion 396a and the second outer edge portion 396b are alternately arranged in the circumferential direction. In the present embodiment, the first outer edge portion 396a and the second outer edge portion 396b are substantially arc-shaped and extend in the circumferential direction. The circumferential dimension of the first outer edge portion 396a is larger than the circumferential dimension of the second outer edge portion 396b.

[0165] The first outer edge portion 396a is arranged at a position overlapping with the second imaginary line Lq when viewed in the axial direction. In the present embodiment, the circumferential center of the first outer edge portion 396a is arranged at a position overlapping with the second imaginary line Lq when viewed in the axial direction. The second outer edge portion 396b is arranged at a position overlapping with the first imaginary line Ld when viewed in the axial direction. In the present embodiment, the circumferential center of the second outer edge portion 396b is arranged at a position overlapping with the first imaginary line Ld when viewed in the axial direction.

[0166] The first outer edge portion 396a is located radially inward of the radial outer edge portion of at least one magnet hole 50. In the present embodiment, the first outer edge portion 396a is located radially inward of the radial outer edge portion of any magnet hole 50. When viewed in the axial direction, the first outer edge portion 396a overlaps with at least one magnet hole 50. Therefore, the radial outer end of at least one magnet hole 50 is not covered by the second plate 90. Therefore, even if the oil O flows into the magnet hole 50 from the axial direction between the core member 37 and the second plate 90, the oil O flowing into the magnet hole 50 will flow radially outward due to the centrifugal force and will be easily discharged from the radial outer end of the magnet hole 50. Therefore, even if the oil O flows into the magnet hole 50, the oil O can be easily discharged immediately, and the deviation of the quality of the rotor 310 can be appropriately suppressed. Therefore, the vibration of the rotor 310 can be appropriately suppressed.

[0167] In the present embodiment, when viewed in the axial direction, each first outer edge portion 396a overlaps with the outer hole portion 51h in the first magnet hole 51a of one of the circumferentially adjacent magnetic pole portions 10P and the end portion 52c of the magnet receiving hole portion 52a in the second magnet hole 52 of the one magnetic pole portion 10P. In addition, when viewed in the axial direction, each first outer edge portion 396a also overlaps with the outer hole portion 51e in the first magnet hole 51a of the other magnetic pole portion 10P of the circumferentially adjacent magnetic pole portion 10P and the end portion 52b of the magnet receiving hole portion 52a in the second magnet hole 52 of the other magnetic pole portion 10P.

[0168] In the present embodiment, all the magnet holes 50 have a portion that overlaps with the first outer edge portion 396a at a position radially inward of the radial outer edge portion of each magnet hole 50 when viewed in the axial direction. Therefore, in all the magnet holes 50, at least a portion of the radially outer end portion is not covered by the second plate 390. Thus, even if the oil O flows into any of the magnet holes 50, the oil O that has flowed into the magnet hole 50 can be easily discharged from the radially outer end portion of the magnet hole 50.

[0169] The second outer edge portion 396b is located radially outward from the radial outer edge portion of the magnet hole 50. The second outer edge portion 396b has a portion located at the same position as the magnet hole 50 in the circumferential direction. Therefore, the radially outer end of a portion of the magnet hole 50 located at the same position as the portion in the circumferential direction can be covered by the circumferential portion of the second plate 390 having the second outer edge portion 396b. Thus, the magnet 40 located in the magnet hole 50 can be appropriately pressed in the axial direction by the circumferential portion of the second plate 390 having the second outer edge portion 396b. Therefore, the magnet 40 can be held in the magnet hole 50 more stably.

[0170] In this embodiment, the second outer edge portion 396b is circumferentially located at the same position as the circumferential center of the second magnet hole 52. Therefore, the second magnet 42 located in the second magnet hole 52 can be appropriately pressed in the axial direction by the circumferential portion of the second plate 390 having the second outer edge portion 396b.

[0171] The other structures of the second plate 390 are the same as those of the second plate 90 in the first embodiment. The other structures of the rotor 310 are the same as those of the rotor 10 in the first embodiment.

[0172] In addition, the radial outer edge portion 396 of the second plate 390 may be composed of only the first outer edge portion 396a or only the second outer edge portion 396b. The radial outer edge portion in a part of the magnet holes 50 may also be located radially outward from the first outer edge portion 396a. When viewed in the axial direction, a part of the magnet holes 50 may not overlap with the first outer edge portion 396a. That is, the plurality of magnet holes 50 may also include magnet holes 50 that are entirely covered by the second plate 390 and magnet holes 50 that overlap with the first outer edge portion 396a when viewed in the axial direction and whose radially outer ends are not covered by the second plate 390. The second outer edge portion 396b may also be located radially inward from the radially outer surface of the rotor core 30.

[0173] <Fourth embodiment>

[0174] like Fig.11 As shown, in the rotor 410 of the present embodiment, a plurality of plate groups 490a including the first plate 80 and the second plate 90 are provided at intervals in the axial direction. Therefore, the oil O can flow from the plate flow path portion 81 provided in the first plate 80 in each plate group 490a into the core flow path portion 35, and the rotor 410 can be cooled more appropriately. In addition, the oil O flowing in the plate flow path portion 81 provided in each first plate 80 can be appropriately suppressed from flowing into the magnet hole 50 by the second plate 90 in each plate group 490a.

[0175] Each plate group 490a is located between the core material parts 37 adjacent to each other in the axial direction. In the present embodiment, each plate group 490a is composed of three plates, namely, one first plate 80 and a pair of second plates 90 sandwiching the first plate 80 in the axial direction. The other structures of the rotor 410 are the same as the other structures of the rotor 10 in the first embodiment. In addition, three or more plate groups 490a may be provided. In addition, each plate group 490a may also be a structure composed of two plates, namely, one first plate 80 and one second plate 90.

[0176] <Fifth Embodiment>

[0177] like Fig.12As shown, the magnetic pole portion 510P in the rotor 510 of the present embodiment has a pair of second magnet holes 552a and 552b. The pair of second magnet holes 552a and 552b are respectively located radially outside the pair of first magnet holes 51a and 51b. The second magnet hole 552a is located radially outside the first magnet hole 51a. The second magnet hole 552b is located radially outside the first magnet hole 51b. The pair of second magnet holes 552a and 552b are arranged between the circumferential directions of the pair of first magnet holes 51a and 51b. In more detail, the pair of second magnet holes 552a and 552b are arranged between the outer hole portions 51e and 51h of the pair of first magnet holes 51a and 51b.

[0178] In the magnetic pole portion 510P, the second magnet hole 552a and the second magnet hole 552b are arranged with the first imaginary line Ld between them in the circumferential direction. That is, when viewed in the axial direction, the first imaginary line Ld passes between the pair of second magnet holes 552a and 552b. In the present embodiment, when viewed in the axial direction, the first imaginary line Ld passes through the circumferential center between the pair of second magnet holes 552a and 552b. When viewed in the axial direction, the second magnet hole 552a and the second magnet hole 552b are arranged line-symmetrically with the first imaginary line Ld as the axis of symmetry.

[0179] When viewed in the axial direction, the pair of second magnet holes 552a and 552b extend in a direction that separates from each other in the circumferential direction as they move from the radial inside to the radial outside. That is, the circumferential distance between the second magnet holes 552a and the second magnet holes 552b increases as they move from the radial inside to the radial outside. When viewed in the axial direction, the pair of second magnet holes 552a and 552b are arranged in a V-shape that expands in the circumferential direction as they move toward the radial outside. When viewed in the axial direction, the inclination of the direction in which the pair of second magnet holes 552a and 552b extend relative to the radial direction is greater than the inclination of the direction in which the pair of first magnet holes 51a and 51b extend relative to the radial direction. The opening angle of the V-shape formed by the pair of second magnet holes 552a and 552b is greater than the opening angle of the V-shape formed by the pair of first magnet holes 51a and 51b.

[0180] The second magnet hole 552a has a magnet receiving hole portion 552c, an inner hole portion 552d, and an outer hole portion 552e. The magnet receiving hole portion 552c is a rectangular hole that is longer in the direction in which the second magnet hole 552a extends when viewed in the axial direction. The inner hole portion 552d is connected to the radially inner end of the end of the magnet receiving hole portion 552c in the direction in which the magnet receiving hole portion 552c extends when viewed in the axial direction. The outer hole portion 552e is connected to the radially outer end of the end of the magnet receiving hole portion 552c in the direction in which the magnet receiving hole portion 552c extends when viewed in the axial direction.

[0181] The second magnet hole 552b has a magnet receiving hole portion 552f, an inner hole portion 552g, and an outer hole portion 552h. The magnet receiving hole portion 552f is a rectangular hole that is longer in the direction in which the second magnet hole 552b extends when viewed in the axial direction. The inner hole portion 552g is connected to the radially inner end of the end of the magnet receiving hole portion 552f in the direction in which the magnet receiving hole portion 552f extends when viewed in the axial direction. The outer hole portion 552h is connected to the radially outer end of the end of the magnet receiving hole portion 552f in the direction in which the magnet receiving hole portion 552f extends when viewed in the axial direction. The inner hole portion 552d and the inner hole portion 552g are arranged at intervals in the circumferential direction across the first imaginary line Ld. The circumferential distance between the inner hole portion 552d and the inner hole portion 552g is smaller than the circumferential distance between the inner hole portion 51d and the inner hole portion 51g.

[0182] When viewed in the axial direction, a pair of second magnets 542a, 542b respectively arranged in a pair of second magnet holes 552a, 552b are arranged along a V-shape that expands in the circumferential direction as it moves toward the radially outer side. That is, in the magnetic pole portion 510P of the present embodiment, two pairs of magnets 40 arranged along a V-shape when viewed in the axial direction are arranged in the radial direction. In the present embodiment, it is also possible to suppress the oil O flowing in the plate flow path portion 81 provided in the first plate 80 from flowing into each magnet hole 51a, 51b, 552a, 552b. The other structures of the rotor 510 are the same as the other structures of the rotor 10 of the first embodiment.

[0183] The present invention is not limited to the above-mentioned embodiments, and other structures and other methods can also be adopted within the scope of the technical idea of ​​the present invention. As long as the plate flow path portion of the first plate has a supply flow path portion that overlaps with the core flow path portion when viewed in the axial direction and a connecting flow path portion that connects the second axial hole portion with the supply flow path portion, it can be of any structure. The plate flow path portion can also be composed of a groove that is axially recessed from the axially facing surface of the first plate. The number of plate flow path portions can be more than one, and there is no special limitation. The connecting flow path portion can be of any shape as long as it connects the second axial hole portion with the supply flow path portion. The connecting flow path portion may not overlap with the magnet hole when viewed in the axial direction. The connecting flow path portion may also extend straight in the radial direction. The flow path width of the connecting flow path portion can be of any size. The supply flow path portion can be of any structure as long as it overlaps with the core flow path portion when viewed in the axial direction.

[0184] The second plate may also be arranged only on either one of the axial direction between the first core member and the first plate and the axial direction between the second core member and the first plate. The second plate may be of any shape as long as it has a through hole and at least a portion is axially opposed to at least a portion of the magnet hole. The axial dimension of the second plate may be the same as the axial dimension of the first plate, or it may be larger than the axial dimension of the first plate. In a cross section perpendicular to the axial direction, the cross-sectional area of ​​the through hole provided in the second plate may be the same as the cross-sectional area of ​​the core flow path portion, or it may be smaller than the cross-sectional area of ​​the core flow path portion. The radial outer edge portion of the through hole may also be located radially inward of the radial outer edge portion of the supply flow path portion.

[0185] The material constituting the first plate and the material constituting the second plate are not particularly limited. The material constituting the first plate and the material constituting the second plate may be the same as each other. At least one of the material constituting the first plate and the material constituting the second plate may be the same as the material constituting the first core member and the material constituting the second core member. The material constituting the first plate and the material constituting the second plate may be a magnetic body, a non-magnetic body, or an insulator. As a core member, at least a first core member and a second core member are provided. That is, the number of core members can be two or more without any particular limitation. For example, 6 core members may be provided, or 8 core members may be provided. Multiple core members may not include core members that are staggered in the circumferential direction. The number of magnets retained in each core member may be one or more without any particular limitation. The arrangement of the magnets in each core member is not particularly limited.

[0186] The use of the drive device to which the present invention is applied is not particularly limited. The drive device can be mounted on a vehicle for purposes other than rotating an axle, for example, or mounted on equipment other than a vehicle. The rotating electric machine to which the present invention is applied is not limited to a motor, but can also be a generator. The use of the rotating electric machine is not particularly limited. The rotating electric machine can also be mounted on equipment other than a vehicle. The posture when using the rotating electric machine is not particularly limited. The central axis of the rotating electric machine can extend in any direction.

[0187] In addition, the present technology can adopt the following structures.

[0188] (1) A rotor capable of rotating around a central axis, wherein the rotor comprises: a shaft extending in an axial direction; a rotor core fixed to the outer peripheral surface of the shaft and comprising a first core member portion and a second core member portion arranged in an axial direction; a first plate arranged in an axial direction between the first core member portion and the second core member portion; a second plate arranged in at least one of an axial direction between the first core member portion and the first plate and an axial direction between the second core member portion and the first plate; and a plurality of magnets retained in the rotor core, wherein the shaft comprises: a first axial hole portion extending in an axial direction; and a second axial hole portion connected to the first axial hole portion and opening in the outer peripheral surface of the shaft, wherein the first axial hole portion is connected to the first axial hole portion and opens in the outer peripheral surface of the shaft, and the second axial hole portion is connected to the first axial hole portion and opens in the outer peripheral surface of the shaft, and the first axial hole portion is connected to the first axial hole portion and opens in the outer peripheral surface of the shaft. The first core member portion and the second core member portion respectively have: a magnet hole for configuring the magnet; and a core flow path portion extending axially, the first plate having a plate flow path portion connecting the second axial hole portion and the core flow path portion, the plate flow path portion having: a supply flow path portion overlapping with the core flow path portion when viewed axially; and a connecting flow path portion connecting the second axial hole portion and the supply flow path portion, the second plate having a through hole passing through the second plate axially, the through hole overlapping with the core flow path portion and the supply flow path portion when viewed axially, and being configured at a position different from the magnet hole, and at least a portion of the second plate is axially opposed to at least a portion of the magnet hole.

[0189] (2) The rotor according to (1), wherein an axial dimension of the first plate is larger than an axial dimension of the second plate.

[0190] (3) The rotor according to (2), wherein a material constituting the first plate and a material constituting the second plate are different from each other.

[0191] (4) The rotor according to (3), wherein the material constituting the first plate is an aluminum alloy, and the material constituting the second plate is an iron alloy.

[0192] (5) The rotor according to any one of (1) to (4), wherein a material constituting the first plate and a material constituting the second plate are different from a material constituting the first core member portion and a material constituting the second core member portion.

[0193] (6) A rotor according to (5), wherein the rotor core has a plurality of core parts including the first core part and the second core part, and the number of the core parts located on one axial side of the first plate and the second plate is the same as the number of the core parts located on the other axial side of the first plate and the second plate.

[0194] (7) A rotor according to (5) or (6), wherein when the axial center between the axial center of the rotor core and the end on one axial side of the rotor core is set as a first center, and the axial center between the axial center of the rotor core and the end on the other axial side of the rotor core is set as a second center, the first plate and the second plate are located axially between the first center and the second center.

[0195] (8) The rotor according to any one of (1) to (7), wherein in a cross section perpendicular to the axial direction, a cross-sectional area of ​​the through hole is larger than a cross-sectional area of ​​the core flow path portion.

[0196] (9) A rotor according to any one of (1) to (8), wherein the radial outer edge portion of the through hole is located at the same radial position as the radial outer edge portion of the supply flow path portion, or is located radially outward of the radial outer edge portion of the supply flow path portion.

[0197] (10) A rotor according to any one of (1) to (9), wherein a portion of the plurality of magnets is located radially inward of the core flow path portion, and another portion of the plurality of magnets is located radially outward of the core flow path portion.

[0198] (11) A rotor according to any one of (1) to (10), wherein the first core member portion and the second core member portion have a plurality of magnet holes, and the radial outer edge portion of the second plate has a first outer edge portion located radially inward of the radial outer edge portion of at least one of the magnet holes, and when viewed in the axial direction, the first outer edge portion overlaps with at least one of the magnet holes.

[0199] (12) The rotor according to (11), wherein all of the magnet holes have a portion that overlaps with the first outer edge portion at a radially inner side of the radially outer edge portion of the magnet hole when viewed in the axial direction.

[0200] (13) A rotor according to (11) or (12), wherein the radial outer edge portion of the second plate has a second outer edge portion located radially outward of the radial outer edge portion of the magnet hole, and the second outer edge portion has a portion located at the same position as the magnet hole in the circumferential direction.

[0201] (14) A rotor according to any one of (1) to (13), wherein the plate flow path portion is composed of a hole that penetrates the first plate in the axial direction, and the second plate is arranged on both sides between the first core member portion and the first plate in the axial direction and between the second core member portion and the first plate in the axial direction.

[0202] (15) A rotor according to (14), wherein the plate flow path portion has a portion that overlaps with the magnet hole when viewed in the axial direction, and the second plate and the portion of the magnet hole that overlaps with the plate flow path portion when viewed in the axial direction are axially opposed to each other.

[0203] (16) The rotor according to any one of (1) to (15), wherein a plurality of plate groups including the first plate and the second plate are provided at intervals in the axial direction.

[0204] (17) A rotating electrical machine comprising: a rotor as described in any one of (1) to (16); and a stator facing the rotor with a gap therebetween.

[0205] (18) A driving device comprising: the rotating electric machine described in (17); and a gear mechanism connected to the rotating electric machine.

[0206] The structures and methods described above in this specification can be appropriately combined within a range that does not contradict each other.

Claims

1. A rotor capable of rotating about a central axis, characterized in that: The rotor has: a shaft extending in an axial direction; A rotor core fixed to the outer peripheral surface of the shaft and having a first core member portion and a second core member portion arranged in the axial direction; a first plate disposed between the first core member portion and the second core member portion in an axial direction; a second plate disposed at least one of between the first core member and the first plate in the axial direction and between the second core member and the first plate in the axial direction; as well as a plurality of magnets, the plurality of magnets being held in the rotor core, The shaft has: A first axial hole portion extending in the axial direction; and a second shaft hole portion connected to the first shaft hole portion and opening on the outer peripheral surface of the shaft, The first core member portion and the second core member portion respectively include: A magnet hole for disposing the magnet; as well as The core flow path portion extends in the axial direction. The first plate has a plate flow path portion connecting the second axial hole portion and the core flow path portion, The plate flow path portion has: a supply flow path portion which overlaps with the core flow path portion when viewed in the axial direction; and a connecting flow path portion connecting the second axial hole portion and the supply flow path portion, The second plate has a through hole that penetrates the second plate in the axial direction. When viewed in the axial direction, the through hole overlaps with the core flow path portion and the supply flow path portion, and is arranged at a position different from the magnet hole. At least a portion of the second plate is opposed to at least a portion of the magnet hole in the axial direction.

2. The rotor according to claim 1, characterized in that The axial dimension of the first plate is larger than the axial dimension of the second plate.

3. The rotor according to claim 2, characterized in that The material constituting the first plate and the material constituting the second plate are different from each other.

4. The rotor according to claim 3, characterized in that The material constituting the first plate is aluminum alloy, The material constituting the second plate is an iron alloy.

5. The rotor according to claim 1, characterized in that A material constituting the first plate and a material constituting the second plate are different from a material constituting the first core member portion and a material constituting the second core member portion.

6. The rotor according to claim 5, characterized in that The rotor core includes a plurality of core members including the first core member and the second core member. The number of the core material portions located on one side in the axial direction relative to the first plate and the second plate and the number of the core material portions located on the other side in the axial direction relative to the first plate and the second plate are the same.

7. The rotor according to claim 5, characterized in that When the axial center between the axial center of the rotor core and the end on one axial side of the rotor core is set as the first center, and the axial center between the axial center of the rotor core and the end on the other axial side of the rotor core is set as the second center, the first plate and the second plate are located axially between the first center and the second center.

8. The rotor according to claim 1, characterized in that In a cross section perpendicular to the axial direction, a cross-sectional area of ​​the through hole is larger than a cross-sectional area of ​​the core flow path portion.

9. The rotor according to claim 1, characterized in that The radially outer edge portion of the through hole is located at the same radial position as the radially outer edge portion of the supply flow path portion, or is located radially outward of the radially outer edge portion of the supply flow path portion.

10. The rotor according to claim 1, characterized in that A portion of the plurality of magnets is located radially inward of the core flow path portion. Another portion of the plurality of magnets is located radially outward of the core flow path portion.

11. The rotor according to claim 1, characterized in that The first core member and the second core member have a plurality of magnet holes. The radial outer edge portion of the second plate has a first outer edge portion located radially inward of the radial outer edge portion of at least one of the magnet holes. When viewed in the axial direction, the first outer edge portion overlaps with at least one of the magnet holes.

12. The rotor according to claim 11, characterized in that All of the magnet holes have a portion overlapping the first outer edge portion at a position radially inward of the radially outer edge portion of the magnet hole when viewed in the axial direction.

13. The rotor according to claim 11, characterized in that The radially outer edge portion of the second plate has a second outer edge portion located radially outward of the radially outer edge portion of the magnet hole. The second outer edge portion has a portion located at the same position as the magnet hole in the circumferential direction.

14. The rotor according to claim 1, characterized in that The plate flow path portion is composed of a hole penetrating the first plate in the axial direction. The second plate is disposed both between the first core member and the first plate in the axial direction and between the second core member and the first plate in the axial direction.

15. The rotor according to claim 14, characterized in that The plate flow path portion has a portion overlapping the magnet hole when viewed in the axial direction, The second plate is axially opposed to a portion of the magnet hole that overlaps with the plate flow path portion when viewed in the axial direction.

16. The rotor according to claim 1, characterized in that A plurality of plate groups including the first plate and the second plate are provided at intervals in the axial direction.

17. A rotating electrical machine, characterized in that: The rotating electrical machine has: A rotor as claimed in any one of claims 1 to 16; and The stator faces the rotor with a gap therebetween.

18. A driving device, characterized in that: The drive device has: The rotating electrical machine according to claim 17; and A gear mechanism is connected to the rotating motor.

Images