Rotors, rotating electric machines, and drive systems

Abstract

To provide a rotor which suppresses that supply of fluid becomes ununiform.SOLUTION: A rotor 30 comprises: a shaft 31 extending in an axial direction; and an annular plate 50 having a plurality of core piece parts lining up in the axial direction to surround the shaft. The shaft comprises: a first shaft hole part 33a extending in the axial direction; and a second shaft hole part 33b having an opening 33c to be connected with the first shaft hole part. A surface 50a on one side in the axial direction of the plate comprises: a first surface 51 provided at an inner edge part in a radial direction of the plate and extending in a circumferential direction; and a second surface 52 located outside the radial direction than the first surface. The plate comprises: a plurality of plate through holes 54 provided on the second surface and arranged at intervals in the circumferential direction; and a plate wall part 59 projecting to one side in the axial direction from a part located outside the radial direction than the inner edge in the radial direction of the first surface and extending in the circumferential direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a rotor, a rotating electrical machine, and a driving device.

Background Art

[0002] There is known a rotating electrical machine provided with a refrigerant flow path through which refrigerant is supplied to a rotor shaft and a refrigerant supply portion that supplies the refrigerant to a rotor core. For example, Patent Document 1 describes a rotating electrical machine including a refrigerant distribution plate provided with a connection flow path that connects a refrigerant supply portion of a rotor shaft and a plurality of in-core flow paths extending in the axial direction inside a rotor core.

Prior Art Documents

Patent Documents

[0003] <舍

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the rotating electrical machine as described above, variations may occur in the refrigerant supplied to each in-core flow path via the refrigerant distribution plate. Therefore, the refrigerant supplied to some of the in-core flow paths may decrease, and there has been a risk that the refrigerant cannot be suitably supplied to the rotor core.

[0005] In view of the above circumstances, an object of the present invention is to provide a rotor, a rotating electrical machine, and a driving device having a structure capable of suppressing non-uniform supply of fluid to a rotor core via a plate.

Means for Solving the Problems

[0006] One aspect of the present invention is a rotor rotatable about a central axis, comprising: a shaft extending in the axial direction; a rotor core fixed to the outer circumferential surface of the shaft and having a plurality of core piece portions aligned in the axial direction; and an annular plate disposed between axially adjacent core piece portions and surrounding the shaft. The shaft has a first shaft hole portion extending in the axial direction and a second shaft hole portion having an opening that opens to the outer circumferential surface of the shaft and connecting to the first shaft hole portion. One axial side surface of the plate has a first surface provided on the radial inner edge of the plate and extending in the circumferential direction, and a second surface located radially outward from the first surface. The first and second surfaces are arranged away from the core piece portions located on one axial side of the plate to the other axial side. The plate has a plurality of plate through holes provided on the second surface and arranged at circumferential intervals, and a plate wall portion that protrudes axially to one side from the portion of the first surface located radially outward from the radial inner edge and extends in the circumferential direction.

[0007] One embodiment of the rotating electric machine of the present invention comprises the rotor described above and a stator facing the rotor with a gap between them.

[0008] One aspect of the drive device of the present invention comprises the above-mentioned rotating electric machine and a gear mechanism connected to the rotating electric machine. [Effects of the Invention]

[0009] According to one aspect of the present invention, it is possible to suppress uneven fluid supply to the rotor core via the plate. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic cross-sectional view showing the drive device of the first embodiment. [Figure 2] Figure 2 is a perspective view showing the rotor of the first embodiment. [Figure 3] Figure 3 is a cross-sectional view showing the rotor of the first embodiment, and is a cross-sectional view taken along line III-III in Figure 2. [Figure 4] Figure 4 is a cross-sectional view showing a part of the rotor of the first embodiment. [Figure 5] Figure 5 is a perspective view showing a portion of the shaft and plate of the first embodiment. [Figure 6] Figure 6 is a perspective view showing the plate of the first embodiment. [Figure 7] Figure 7 is a cross-sectional view showing a part of the rotor of the second embodiment. [Figure 8] Figure 8 is a cross-sectional view showing a portion of the rotor of the third embodiment. [Figure 9] Figure 9 is a cross-sectional view showing the rotor of the fourth embodiment. [Modes for carrying out the invention]

[0011] In the following description, the vertical direction will be defined and explained based on the positional relationship when the drive unit of the embodiment is mounted on a vehicle located on a horizontal road surface. In other words, the relative positional relationship with respect to the vertical direction described in the following embodiment only needs to be satisfied when the drive unit is mounted on a vehicle located on a horizontal road surface.

[0012] In the drawings, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system where appropriate. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The +Z side is the upper vertical side, and the -Z side is the lower vertical side. In the following description, the upper vertical side will simply be referred to as "upper side," and the lower vertical side will simply be referred to as "lower side." The X-axis direction is perpendicular to the Z-axis direction and is the longitudinal direction of the vehicle on which the drive unit is mounted. In the following embodiments, the +X side is the front of the vehicle, and the -X side is the rear of the vehicle. The Y-axis direction is perpendicular to both the X-axis and Z-axis directions and is the lateral direction of the vehicle, i.e., the vehicle width direction. In the following embodiments, the +Y side is the left side of the vehicle, and the -Y side is the right side of the vehicle. The longitudinal and lateral directions are horizontal directions perpendicular to the vertical direction.

[0013] Note that the positional relationship in the front-rear direction is not limited to the positional relationship in the following embodiments. 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. Also, in this specification, the "parallel direction" includes a substantially parallel direction, and the "orthogonal direction" includes a substantially orthogonal direction.

[0014] The central axis J shown in the figure as appropriate is a virtual axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends in the Y-axis direction orthogonal to the vertical direction, that is, in the left-right direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply referred to as the "axial direction", the radial direction centered on the central axis J is simply referred to as the "radial direction", and the circumferential direction centered on the central axis J, that is, the axis rotation around the central axis J is simply referred to as the "circumferential direction".

[0015] Note that in the following embodiments, the left side (+Y side) corresponds to the "one side in the axial direction", and the right side (-Y side) corresponds to the "other side in the axial direction".

[0016] <First Embodiment> The drive device 100 of the present embodiment shown in FIG. 1 is a drive device mounted on a vehicle and rotates the axle 64. The vehicle on which the drive device 100 is mounted is a vehicle using a motor as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), or an electric vehicle (EV). As shown in FIG. 1, the drive device 100 includes a rotating electric machine 10, a housing 80, a gear mechanism 60, and a flow path 90. The rotating electric machine 10 includes a rotor 30 rotatable about the central axis J and a stator 40 located radially outside the rotor 30. The configurations of the rotating electric machine 10 other than those described above will be described later.

[0017] The housing 80 houses the rotating electric machine 10 and the gear mechanism 60. The housing 80 has a motor housing 81 and a gear housing 82. The motor housing 81 is a housing that houses the rotor 30 and the stator 40 inside. The motor housing 81 is connected to the right side of the gear housing 82. The motor housing 81 has a peripheral wall portion 81a, a partition wall portion 81b, and a lid portion 81c. The peripheral wall portion 81a and the partition wall portion 81b are, for example, parts of the same single member. The lid portion 81c is, for example, separate from the peripheral wall portion 81a and the partition wall portion 81b.

[0018] The peripheral wall portion 81a is cylindrical, surrounding the central axis J and opening to the right. The partition wall portion 81b is connected to the left end of the peripheral wall portion 81a. The partition wall portion 81b axially separates the inside of the motor housing 81 and the inside of the gear housing 82. The partition wall portion 81b has a partition opening 81d that connects the inside of the motor housing 81 and the inside of the gear housing 82. A bearing 34 is held by the partition wall portion 81b. The lid portion 81c is fixed to the right end of the peripheral wall portion 81a. The lid portion 81c closes the opening on the right side of the peripheral wall portion 81a. A bearing 35 is held by the lid portion 81c.

[0019] The gear housing 82 houses the speed reduction device 62 and the differential device 63, which will be described later, of the gear mechanism 60, and oil O inside. The oil O is stored in the lower region inside the gear housing 82. The oil O circulates in a flow path 90, which will be described later. The oil O is used as a refrigerant for cooling the rotating electric machine 10. Also, the oil O is used as a lubricating oil for the speed reduction device 62 and the differential device 63. As the oil O, for example, in order to exhibit 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) with a relatively low viscosity.

[0020] The gear mechanism 60 is connected to the rotating electric machine 10 and transmits the rotation of the rotor 30 to the vehicle's axle 64. The gear mechanism 60 in this embodiment has a reduction gear 62 connected to the rotating electric machine 10 and a differential gear 63 connected to the reduction gear 62. The differential gear 63 has a ring gear 63a. Torque output from the rotating electric machine 10 is transmitted to the ring gear 63a via the reduction gear 62. The lower end of the ring gear 63a is immersed in oil O stored in the gear housing 82. As the ring gear 63a rotates, the oil O is stirred up. The stirred-up oil O is supplied, for example, as lubricant to the reduction gear 62 and the differential gear 63.

[0021] The rotating electric machine 10 is the part that drives the drive unit 100. The rotating electric machine 10 is located, for example, to the right of the gear mechanism 60. In this embodiment, the rotating electric machine 10 is a motor. The torque of the rotor 30 of the rotating electric machine 10 is transmitted to the gear mechanism 60. The rotor 30 has a shaft 31 that extends axially about a central axis J, and a rotor core 32 fixed to the outer circumferential surface of the shaft 31. As shown in Figure 2, the rotor 30 has a plurality of magnets 37 held in the rotor core 32, and end plates 39 and a plate 50 arranged at the axial ends on both sides of the rotor core 32.

[0022] As shown in Figure 1, the shaft 31 is rotatable about a central axis J. The shaft 31 is rotatably supported by bearings 34 and 35. In this embodiment, the shaft 31 is a hollow shaft. The shaft 31 is cylindrical in shape, through which oil O as a coolant can flow. The shaft 31 extends across the interior of the motor housing 81 and the gear housing 82. The left end of the shaft 31 protrudes into the interior of the gear housing 82. A reduction gear 62 is connected to the left end of the shaft 31.

[0023] The shaft 31 has a first shaft bore 33a that extends in the axial direction. The interior of the first shaft bore 33a is composed of the interior of the hollow shaft 31. In this embodiment, the first shaft bore 33a is a hole that penetrates the shaft 31 in the axial direction and is open on both sides in the axial direction. In this embodiment, the first shaft bore 33a is a circular hole centered on the central axis J.

[0024] The shaft 31 has a second shaft hole 33b connected to the first shaft hole 33a. The second shaft hole 33b is a hole that penetrates the wall of the shaft 31 radially from the inner circumferential surface of the shaft 31 to the outer circumferential surface of the shaft 31. In this embodiment, the second shaft hole 33b is a circular hole. As shown in Figures 3 and 4, the second shaft hole 33b has an opening 33c that opens to the outer circumferential surface of the shaft 31. The inner diameter of the opening 33c increases towards the radially outward direction. As shown in Figure 3, in this embodiment, multiple second shaft holes 33b are provided along the circumferential direction. Multiple second shaft holes 33b are arranged at equal intervals along the circumferential direction over a full circumference. In this embodiment, four second shaft holes 33b are provided. The circumferential position of the opening 33c of each second shaft hole 33b is the circumferential position between adjacent plate through holes 54, which will be described later.

[0025] As shown in Figure 2, the rotor core 32 has a plurality of core piece portions 36 arranged in the axial direction. The core piece portions 36 are made of magnetic material. The core piece portions 36 are cylindrical with a central axis J at their center, and in this embodiment, they are cylindrical in shape. The inner circumferential surface of the core piece portion 36 is fixed to the outer circumferential surface of the shaft 31 by press-fitting or the like. The core piece portions 36 and the shaft 31 are fixed so that they cannot move relative to each other in the axial, radial, and circumferential directions. Although not shown in the figure, the core piece portion 36 has a plurality of electromagnetic steel plates arranged in the axial direction.

[0026] The multiple core piece portions 36 include multiple first core piece portions 36A and multiple second core piece portions 36B. The multiple first core piece portions 36A constitute the right (-Y side) portion of the rotor core 32. Axial adjacent first core piece portions 36A are in contact with each other. The multiple second core piece portions 36B constitute the left (+Y side) portion of the rotor core 32. Axial adjacent second core piece portions 36B are in contact with each other. A plate 50 is positioned between the multiple first core piece portions 36A and the multiple second core piece portions 36B in the axial direction. In this embodiment, there are four first core piece portions 36A and four second core piece portions 36B.

[0027] Multiple first core piece portions 36A are arranged so that they are shifted to one side in the circumferential direction (+θ side) as they move away from the plate 50 to the right (-Y side). The circumferential direction (+θ side) is the side that moves clockwise around the central axis J when viewed from the right side (-Y side) in the circumferential direction, i.e., the side in which arrow θ in Figure 2 points (+θ side). Multiple second core piece portions 36B are arranged so that they are shifted to one side in the circumferential direction (+θ side) as they move away from the plate 50 to the left (+Y side). In other words, in this embodiment, the direction of twist of the step skew of the multiple first core piece portions 36A arranged side by side on the right side of the plate 50 is different from the direction of twist of the step skew of the multiple second core piece portions 36B arranged side by side on the left side of the plate 50. This provides effects such as reducing cogging torque and torque ripple.

[0028] As shown in Figure 3, the rotor core 32 has a plurality of magnet holes 36h. The plurality of magnet holes 36h penetrate the rotor core 32 in the axial direction, for example. A plurality of magnets 37 are housed inside each of the plurality of magnet holes 36h. The method of fixing the magnets 37 within the magnet holes 36h is not particularly limited. The plurality of magnet holes 36h include a pair of first magnet holes 36c,36d and a second magnet hole 36e.

[0029] The types of the multiple magnets 37 are not particularly limited. The magnets 37 may be, for example, neodymium magnets or ferrite magnets. The multiple magnets 37 include a pair of first magnets 37c, 37d arranged in a pair of first magnet holes 36c, 36d, and a second magnet 37e arranged in a second magnet hole 36e.

[0030] In this embodiment, a pair of first magnet holes 36c, 36d, a pair of first magnets 37c, 37d, a second magnet hole 36e, and a second magnet 37e are provided in multiples, spaced apart in the circumferential direction. For example, eight of each of the pair of first magnet holes 36c, 36d, a pair of first magnets 37c, 37d, a second magnet hole 36e, and a second magnet 37e are provided.

[0031] The rotor 30 has a plurality of magnetic pole portions 38 arranged at intervals in the circumferential direction. For example, there are eight magnetic pole portions 38. The plurality of magnetic pole portions 38 are arranged at equal intervals along the circumferential direction. The plurality of magnetic pole portions 38 include a plurality of magnetic pole portions 38N whose magnetic poles on the outer circumferential surface of the rotor core 32 are north poles, and a plurality of magnetic pole portions 38S whose magnetic poles on the outer circumferential surface of the rotor core 32 are south poles. For example, there are four magnetic pole portions 38N and four magnetic pole portions 38S. The four magnetic pole portions 38N and four magnetic pole portions 38S are arranged alternately along the circumferential direction. The configuration of each magnetic pole portion 38 is similar except that the magnetic poles on the outer circumferential surface of the rotor core 32 are different and their circumferential positions are different.

[0032] The magnetic pole portion 38 includes a magnet 37 and a magnet hole portion 36h in which the magnet 37 is placed. In this embodiment, the magnetic pole portion 38 has one each of a pair of first magnet holes 36c, 36d, a pair of first magnets 37c, 37d, a second magnet hole portion 36e, and a second magnet 37e.

[0033] In the magnetic pole section 38, a pair of first magnet holes 36c and 36d are spaced apart from each other in the circumferential direction. The first magnet holes 36c and 36d are positioned so as to sandwich the magnetic pole centerline Ld in the circumferential direction. The magnetic pole centerline Ld is an imaginary line that passes through the circumferential center of the magnetic pole section 38 and the central axis J, and extends radially. A magnetic pole centerline Ld is provided for each magnetic pole section 38. When viewed in the axial direction, the magnetic pole centerline Ld passes along the d-axis of the rotor 30. The direction in which the magnetic pole centerline Ld extends is in the d-axis direction of the rotor 30. When viewed in the axial direction, the first magnet holes 36c and 36d are positioned symmetrically with respect to the magnetic pole centerline Ld.

[0034] The pair of first magnet holes 36c and 36d extend in a direction that moves circumferentially away from each other as viewed in the axial direction from the radially inward to the radially outward. In other words, the circumferential distance between the first magnet hole 36c and the first magnet hole 36d increases as viewed from the radially inward to the radially outward. The pair of first magnet holes 36c and 36d are arranged along a V-shape that widens circumferentially as it widens radially outward as viewed in the axial direction. The pair of first magnets 37c and 37d, which are positioned in the pair of first magnet holes 36c and 36d, are arranged along a V-shape that widens circumferentially as it widens radially outward as it widens radially outward as viewed in the axial direction.

[0035] The second magnet hole 36e is located between the radially outer ends of the pair of first magnet holes 36c and 36d in the circumferential direction. The second magnet hole 36e extends substantially linearly in a direction perpendicular to the radial direction when viewed in the axial direction, for example. The second magnet hole 36e extends in a direction perpendicular to the magnetic pole center line Ld when viewed in the axial direction. The pair of first magnet holes 36c and 36d and the second magnet hole 36e are arranged along an L-shape when viewed in the axial direction. The pair of first magnets 37c and 37d located in the pair of first magnet holes 36c and 36d and the second magnet 37e located in the second magnet hole 36e are arranged along an L-shape when viewed in the axial direction.

[0036] The rotor core 32 has a plurality of core holes 37f that extend axially and are spaced apart in the circumferential direction. The plurality of core holes 37f are each located on the inter-pole centerline Lq when viewed in the axial direction. The inter-pole centerline Lq is an imaginary line that extends radially, passing through the circumferential center and central axis J between adjacent circumferential pole portions 38. When viewed in the axial direction, the inter-pole centerline Lq passes along the q-axis of the rotor 30. The direction in which the inter-pole centerline Lq extends is in the q-axis direction of the rotor 30. An inter-pole centerline Lq is provided between each of the pole portions 38. The direction in which the inter-pole centerline Ld extends and the direction in which the inter-pole centerline Lq extends are in mutually intersecting directions. The inter-pole centerline Ld and the inter-pole centerline Lq are provided alternately along the circumferential direction. As described above, since the core hole portion 37f is positioned on the center line Lq between magnetic poles, the circumferential position of the core hole portion 37f includes the circumferential center position between adjacent magnetic pole portions 38 in the circumferential direction.

[0037] In this embodiment, the circumferential dimension of the core hole 37f decreases as it extends radially outward. In this embodiment, the core hole 37f is approximately triangular in shape with rounded corners when viewed in the axial direction. The radially outer portion of the core hole 37f is located circumferentially between the first magnet hole 36c in one of the circumferentially adjacent magnetic pole portions 38 and the first magnet hole 36d in the other of the circumferentially adjacent magnetic pole portions 38. The radially inner portion of the core hole 37f is located radially inward from the magnet hole 36h.

[0038] As shown in Figure 4, the core hole portion 37f includes a first core hole portion 37g and a second core hole portion 37h. The first core hole portion 37g is located in the rotor core 32 to the right (-Y side) of the plate 50. The first core hole portion 37g axially penetrates a plurality of first core piece portions 36A located to the right of the plate 50. Multiple first core hole portions 37g are arranged at intervals in the circumferential direction. The second core hole portion 37h is located in the rotor core 32 to the left (+Y side) of the plate 50. The second core hole portion 37h axially penetrates a plurality of second core piece portions 36B located to the left of the plate 50. Multiple second core hole portions 37h are arranged at intervals in the circumferential direction. Each first core hole portion 37g and each second core hole portion 37h are positioned to overlap each other when viewed in the axial direction.

[0039] The plate 50 is positioned between axially adjacent core piece portions 36. In this embodiment, the plate 50 is located between the first core piece portion 36A and the second core piece portion 36B in the axial direction. The plate 50 is in contact with each of the core piece portions 36 that sandwich the plate 50 in the axial direction. As shown in Figure 5, the plate 50 is annular in shape surrounding the shaft 31. More specifically, the plate 50 is an annular shape centered on the central axis J. The plate 50 is plate-shaped with its surface facing axially. The material constituting the plate 50 is non-magnetic. The outer diameter of the plate 50 is slightly smaller than the outer diameter of the rotor core 32.

[0040] The left surface 50a of the plate 50, which is the left side (+Y side), has a first surface 51, a second surface 52, and a third surface 53. In this embodiment, the first surface 51, the second surface 52, and the third surface 53 are annular, surrounding the shaft 31. That is, the first surface 51, the second surface 52, and the third surface 53 extend in the circumferential direction. More specifically, the first surface 51, the second surface 52, and the third surface 53 are annular, centered on the central axis J. In this embodiment, the first surface 51, the second surface 52, and the third surface 53 face to the left and are surfaces perpendicular to the axial direction.

[0041] The first surface 51 is provided on the radial inner edge of the plate 50. The radial inner edge of the first surface 51 is the radial inner edge of the left surface 50a. In this embodiment, the first surface 51 is the rightmost (-Y side) surface of the left surface 50a.

[0042] The second surface 52 is located radially outward from the first surface 51. In this embodiment, the second surface 52 is connected to the radially outward side of the first surface 51 via a step 57. In other words, in this embodiment, the first surface 51 and the second surface 52 are radially connected via a step 57. The step 57 is a step that protrudes to the left (+Y side) when traversing from the first surface 51 to the second surface 52. The second surface 52 is positioned to protrude to the left (+Y side) of the first surface 51. When viewed in the axial direction, the second surface 52 surrounds the first surface 51. As shown in Figure 3, the second surface 52 is located radially inward from the magnet hole 36h.

[0043] The third surface 53 is connected to the radially outer side of the second surface 52 via a step 58. The step 58 is a step that protrudes to the left (+Y side) when traversing from the second surface 52 to the third surface 53. The third surface 53 is positioned to protrude to the left of the second surface 52. The third surface 53 is provided on the radial outer edge of the plate 50. The radial outer edge of the third surface 53 is the radial outer edge of the left surface 50a. In this embodiment, the third surface 53 is the leftmost surface of the left surface 50a. The third surface 53 is provided with a groove 56 that extends in the circumferential direction. The groove 56 is an annular groove surrounding the shaft 31. By visually inspecting the groove 56, workers handling the plate 50 can easily determine which surface of the plate 50 is the left surface 50a on which the first surface 51 and the second surface 52 are provided.

[0044] As shown in Figure 4, the first surface 51 and the second surface 52 are positioned away from the core piece portion 36 located on the left side (+Y side) of the plate 50, to the right side (-Y side). A gap G1 is provided between the core piece portion 36 located on the left side of the plate 50 and the first surface 51 in the axial direction. A gap G2 is provided between the core piece portion 36 located on the left side of the plate 50 and the second surface 52 in the axial direction. The axial dimension of gap G1 is larger than the axial dimension of gap G2. The axial dimensions of gaps G1 and G2 are smaller than the axial dimension of the opening 33c, i.e., the inner diameter of the opening 33c. Gaps G1 and G2 are radially opposite the axial center of the opening 33c. The third surface 53 is in contact with the core piece portion 36 located on the left side of the plate 50.

[0045] As shown in Figure 6, in this embodiment, the right surface 50b, which is the right side (-Y side) of the plate 50, is a flat surface. That is, unlike the left surface 50a, there is no step on the right surface 50b. In this embodiment, the right surface 50b is a surface perpendicular to the axial direction. As shown in Figure 4, the right surface 50b is in contact with the core piece portion 36 located on the right side of the plate 50. There is no gap between the core piece portion 36 located on the right side of the plate 50 and the right surface 50b in the axial direction.

[0046] As shown in Figure 5, the plate 50 has a plurality of plate through-holes 54 provided on the second surface 52. The plurality of plate through-holes 54 penetrate the plate 50 in the axial direction. The plurality of plate through-holes 54 are spaced apart in the circumferential direction. More specifically, the plurality of plate through-holes 54 are spaced equally along the circumference. As shown in Figure 3, the plurality of plate through-holes 54 are positioned so as to coincide with the center line Lq between magnetic poles when viewed in the axial direction. The circumferential position of the plate through-holes 54 includes the circumferential center position between adjacent magnetic pole portions 38 in the circumferential direction. Each plate through-hole 54 is positioned offset in the circumferential direction from the opening 33c of each second shaft hole portion 33b.

[0047] Multiple plate through-holes 54 overlap each of the multiple core hole portions 37f when viewed in the axial direction. In this embodiment, the entirety of each plate through-hole 54 overlaps each of the core hole portions 37f when viewed in the axial direction. The plate through-holes 54 are smaller than the core hole portions 37f when viewed in the axial direction. In this embodiment, the entire inner edge of the plate through-hole 54 is positioned away from the inner edge of the core hole portions 37f. Multiple plate through-holes 54 are each connected to the multiple core hole portions 37f in the axial direction.

[0048] In this embodiment, the circumferential dimensions of the plate through-holes 54 decrease as they move radially outward. The circumferential dimensions of the plate through-holes 54 are smaller than the circumferential distance between adjacent plate through-holes 54 in the circumferential direction. The plate through-holes 54 are substantially trapezoidal when viewed in the axial direction. The radial outer edge of the plate through-hole 54 is located at the radial outer edge of the second surface 52.

[0049] As shown in Figure 5, the plate 50 has a plate wall portion 59. The plate wall portion 59 is a wall that protrudes to the left (+Y side) from the portion of the first surface 51 that is located radially outward from the radial inner edge. More specifically, the plate wall portion 59 protrudes to the left from the radial outer edge of the first surface 51. The plate wall portion 59 extends in the circumferential direction. In this embodiment, the plate wall portion 59 is annular, surrounding the shaft 31. More specifically, the plate wall portion 59 is annular, centered on the central axis J. In this embodiment, the plate wall portion 59 is formed by a step 57 between the first surface 51 and the second surface 52. The radially inner surface of the plate wall portion 59 is the stepped surface of the step 57 that faces radially inward. As shown in Figures 3 and 4, a portion of the plate wall portion 59 is positioned opposite the opening 33c radially outward with a gap between them. That is, in this embodiment, the opening 33c faces the plate wall portion 59.

[0050] As shown in Figure 5, the plate 50 has a fitting projection 55. The fitting projection 55 is provided on the radially inner edge of the plate 50. The fitting projection 55 protrudes radially inward. The fitting projection 55 is fitted into a fitting recess 31a provided on the outer circumferential surface of the shaft 31. This positions the plate 50 circumferentially with respect to the shaft 31. The fitting recess 31a extends in the axial direction. A pair of fitting projections 55 and fitting recesses 31a are provided, with the central axis J in between.

[0051] As shown in Figure 1, the stator 40 faces the rotor 30 with a radial gap between them. The stator 40 surrounds the rotor 30 from the radial outside to the entire circumference. The stator 40 is fixed inside the motor housing 81. The stator 40 includes a stator core 41 and a coil assembly 42.

[0052] The stator core 41 is annular in shape, surrounding the central axis J of the rotating electric machine 10. The stator core 41 is constructed by stacking multiple plate members, such as electrical steel sheets, in the axial direction. The coil assembly 42 has multiple coils 42c attached to the stator core 41 along the circumferential direction. Each of the coils 42c is mounted on each tooth of the stator core 41 (not shown) via an insulator (not shown). The coils 42c are arranged along the circumferential direction. Each coil 42c has a portion that protrudes axially from the stator core 41.

[0053] The flow path 90 is provided inside the housing 80. Oil O as a fluid flows through the flow path 90. The flow path 90 spans the inside of the motor housing 81 and the inside of the gear housing 82. The flow path 90 is a path through which oil O stored in the gear housing 82 is supplied to the rotating electric machine 10 in the motor housing 81 and returns to the gear housing 82. A pump 71 and a cooler 72 are provided in the flow path 90. The flow path 90 has a first flow path section 91, a second flow path section 92, a third flow path section 93, a fluid supply section 70, a shaft internal flow path section 95, a connecting flow path section 94, a plate flow path section 96, a rotor core internal flow path section 98, and a guide flow path section 97.

[0054] The first flow channel 91, the second flow channel 92, and the third flow channel 93 are provided, for example, on the wall of the gear housing 82. The first flow channel 91 connects the part of the gear housing 82 where oil O is stored to the pump 71. The second flow channel 92 connects the pump 71 to the cooler 72. The third flow channel 93 connects the cooler 72 to the fluid supply unit 70. In this embodiment, the third flow channel 93 is connected to the left end of the fluid supply unit 70, that is, the upstream part of the fluid supply unit 70.

[0055] The fluid supply unit 70 supplies oil O to the stator 40. In this embodiment, the fluid supply unit 70 is tubular and extends in the axial direction. In other words, in this embodiment, the fluid supply unit 70 is a pipe that extends in the axial direction. Both axial ends of the fluid supply unit 70 are supported by the motor housing 81. The left end of the fluid supply unit 70 is supported, for example, by a partition wall 81b. The right end of the fluid supply unit 70 is supported, for example, by a cover 81c. The fluid supply unit 70 is located radially outward from the stator 40. In this embodiment, the fluid supply unit 70 is located above the stator 40.

[0056] The fluid supply unit 70 has a supply port 70a for supplying oil O to the stator 40. In this embodiment, the supply port 70a is an injection port that injects a portion of the oil O that has flowed into the fluid supply unit 70 to the outside of the fluid supply unit 70. The supply port 70a is composed of a hole that penetrates the wall of the fluid supply unit 70 from the inner circumferential surface to the outer circumferential surface. Multiple supply ports 70a are provided in the fluid supply unit 70. The multiple supply ports 70a are arranged, for example, spaced apart from each other in the axial or circumferential direction.

[0057] The connecting channel section 94 connects the fluid supply section 70 and the shaft internal channel section 95. In this embodiment, the connecting channel section 94 is provided in the cover section 81c. The shaft internal channel section 95 is formed by the inside of the hollow shaft 31. The shaft internal channel section 95 extends in the axial direction. The shaft internal channel section 95 is arranged to span the inside of the motor housing 81 and the inside of the gear housing 82.

[0058] The plate flow path section 96 connects the shaft internal flow path section 95 and the rotor core internal flow path section 98. As shown in Figure 4, the plate flow path section 96 is composed of a plate 50 and a core piece section 36 located to the left (+Y side) of the plate 50. The interior of the plate flow path section 96 is composed of gaps G1 and G2 provided in the axial direction between the plate 50 and the core piece section 36. The plate flow path section 96 is connected to the shaft internal flow path section 95 via the second shaft hole section 33b.

[0059] The rotor core internal flow channel 98 is composed of multiple core holes 37f. In other words, multiple rotor core internal flow channel 98 are provided at intervals in the circumferential direction. As shown in Figure 1, the rotor core internal flow channel 98 connects the plate flow channel 96 and the guide flow channel 97. As shown in Figure 2, the guide flow channel 97 is provided on each of the pair of end plates 39. Multiple guide flow channel 97 are provided on each end plate 39 at intervals in the circumferential direction. Each guide flow channel 97 is connected to the axial end of each core hole 37f. The guide flow channel 97 extends radially. The guide flow channel 97 opens radially outward.

[0060] As shown in Figure 1, when the pump 71 is driven, the oil O stored in the gear housing 82 is drawn up through the first passage section 91 and flows into the cooler 72 through the second passage section 92. After being cooled in the cooler 72, the oil O flows through the third passage section 93 to the fluid supply section 70. A portion of the oil O that flows into the fluid supply section 70 is injected from the supply port 70a and supplied to the stator 40. Another portion of the oil O that flows into the fluid supply section 70 flows into the shaft internal passage section 95 through the connecting passage section 94.

[0061] As shown in Figure 4, a portion of the oil O flowing through the shaft internal flow channel 95 flows from the second shaft hole 33b into the gaps G1 and G2 between the plate 50 and the core piece 36, i.e., into the plate flow channel 96. Within the plate flow channel 96, the oil O flows from gap G1 to gap G2. The oil O that has flowed into the plate flow channel 96 flows from gap G2 into the rotor core internal flow channel 98. More specifically, a portion of the oil O that has flowed into the plate flow channel 96 flows from gap G2 through the plate through hole 54 into the first core hole 37g located on the right side (-Y side) of the plate 50 in the rotor core 32. Another portion of the oil O that has flowed into the plate flow channel 96 flows from gap G2 into the second core hole 37h located on the left side (+Y side) of the plate 50 in the rotor core 32.

[0062] As shown in Figure 1, the oil O that flows into the rotor core internal passage 98 flows through the guide passage 97 and is scattered onto the stator 40. The remaining portion of the oil O that flows into the shaft internal passage 95 is discharged into the gear housing 82 through the opening on the left side of the shaft 31 and is stored again inside the gear housing 82.

[0063] The oil O supplied to the stator 40 from the supply port 70a absorbs heat from the stator 40, and the oil O supplied to the rotor 30 and stator 40 from inside the shaft 31 absorbs heat from the rotor 30 and stator 40. The oil O that has cooled the stator 40 and rotor 30 falls downward and accumulates in the lower region of the motor housing 81. The oil O accumulated in the lower region of the motor housing 81 returns to the gear housing 82 through the partition opening 81d provided in the partition 81b. In this manner, the flow path 90 supplies the oil O stored in the gear housing 82 to the rotor 30 and stator 40.

[0064] According to this embodiment, the plate 50 has a plate wall portion 59 that protrudes to the left (+Y side) from the portion of the first surface 51 located radially outward from the radial inner edge. Therefore, as shown in Figure 3, at least a portion of the oil O that flows into the gap G1 between the first surface 51 of the plate 50 and the core piece portion 36 flows radially outward and hits the plate wall portion 59. Since the plate wall portion 59 extends in the circumferential direction, the oil O that hits the plate wall portion 59 flows circumferentially along the plate wall portion 59. In the example of Figure 3, the oil O that hits the plate wall portion 59 branches and flows to both sides in the circumferential direction along the plate wall portion 59. This allows the oil O that flows into the gap G1 from the second shaft hole portion 33b to spread circumferentially. Therefore, the oil O that flows from the gap G1 between the first surface 51 and the core piece portion 36 to the gap G2 between the second surface 52 and the core piece portion 36 can be evenly distributed to the multiple plate through holes 54 arranged circumferentially on the second surface 52. In other words, variations in the amount of oil O flowing into the multiple plate through holes 54 can be suppressed. As a result, variations in the amount of oil O supplied to the rotor core 32 via the multiple plate through holes 54 can be suppressed in the circumferential direction. This suppresses uneven supply of oil O to the rotor core 32 via the plate 50. Consequently, the rotor core 32 and the magnet 37 can be suitably cooled by the oil O.

[0065] By effectively cooling the magnet 37, it is possible to suppress the magnet 37 from becoming too hot, and thus effectively suppress demagnetization of the magnet 37. As a result, a decrease in the output torque of the rotating electric machine 10 can be suppressed. This makes it possible to maintain the output torque of the rotating electric machine 10 even when using an inexpensive magnet with relatively low magnetic force as the magnet 37. Therefore, the manufacturing cost of the drive unit 100 can be reduced by using an inexpensive magnet 37 while maintaining the output of the drive unit 100.

[0066] Furthermore, according to this embodiment, the opening 33c of the second shaft hole 33b faces the plate wall 59. Therefore, the oil O that flows into the gap G1 between the plate 50 and the core piece 36 from the opening 33c easily comes into contact with the plate wall 59. This allows the oil O to spread more favorably in the circumferential direction along the plate wall 59. Consequently, variations in the amount of oil O supplied to the rotor core 32 through the multiple plate through holes 54 in the circumferential direction can be further suppressed.

[0067] Furthermore, according to this embodiment, the plate wall portion 59 is annular in shape, surrounding the shaft 31. Therefore, the oil O that flows into the gap G1 between the plate 50 and the core piece portion 36 from the opening 33c can be more easily directed onto the plate wall portion 59. This allows the oil O to spread more favorably in the circumferential direction along the plate wall portion 59.

[0068] Furthermore, according to this embodiment, the first surface 51 and the second surface 52 are annular, surrounding the shaft 31. Therefore, the oil O in the gaps G1 and G2 can be easily allowed to flow circumferentially along the first surface 51 and the second surface 52. This allows the oil O to be spread more effectively in the circumferential direction.

[0069] Furthermore, according to this embodiment, the circumferential position of the opening 33c is the circumferential position between adjacent plate through-holes 54 in the circumferential direction. Therefore, it is possible to suppress the oil O that flows into the gap G1 from the opening 33c from flowing radially outward and directly into the plate through-holes 54. This allows the oil O that flows into the gap G1 to be spread circumferentially by the plate wall portion 59, etc., before flowing into the plate through-holes 54. Consequently, it is possible to suppress the oil O flowing from the opening 33c from flowing into only one plate through-hole 54, and further suppress variations in the amount of oil O flowing into multiple plate through-holes 54.

[0070] Furthermore, according to this embodiment, the second surface 52 is positioned to protrude to the left (+Y side) of the first surface 51. The first surface 51 and the second surface 52 are connected radially via a step 57. The plate wall portion 59 is formed by the step 57. Therefore, the oil O that has spread circumferentially and flowed onto the second surface 52 can be further spread on the second surface 52 by the plate wall portion 59. This makes it easier to more favorably allow the oil O to flow into each of the plate through holes 54 provided in the second surface 52.

[0071] Furthermore, according to this embodiment, the left surface 50a of the plate 50 has a third surface 53 connected to the radially outer side of the second surface 52 via a step 58. The third surface 53 is positioned to protrude to the left of the second surface 52. Therefore, the oil O flowing radially outward in the gap G2 between the second surface 52 and the core piece portion 36 can be brought into contact with the step 58 and spread circumferentially. This makes it easier to spread the oil O more circumferentially on the second surface 52.

[0072] Furthermore, according to this embodiment, each of the multiple core holes 37f is connected to each of the multiple plate through holes 54. Therefore, the oil O that flows into each plate through hole 54 can be allowed to flow into each core hole 37f. This allows the rotor core 32 and magnet 37 to be cooled more effectively by the oil O.

[0073] Furthermore, according to this embodiment, the entire plate through-hole 54 overlaps with the core hole 37f when viewed in the axial direction. The plate through-hole 54 is smaller than the core hole 37f when viewed in the axial direction. By making each plate through-hole 54 relatively small in this way and limiting the amount of oil O flowing into each plate through-hole 54, variations in the amount of oil O flowing into each plate through-hole 54 can be further suppressed. In addition, because the entire plate through-hole 54 overlaps with the core hole 37f when viewed in the axial direction, it is easier to ensure that all of the oil O that flows into the plate through-hole 54 flows nicely into the core hole 37f.

[0074] Furthermore, according to this embodiment, the circumferential position of the plate through-hole 54 and the circumferential position of the core hole 37f include the circumferential center position between adjacent magnetic pole portions 38 in the circumferential direction. Therefore, the core hole 37f can be provided in a location that is less affected by the flow of magnetic flux generated in the magnetic pole portions 38, while making it easier to allow oil O to flow from the plate through-hole 54 into the core hole 37f.

[0075] Furthermore, according to this embodiment, the circumferential dimensions of the core hole 37f decrease as they extend radially outward. Therefore, it is easy to shape the circumferential edge of the core hole 37f to conform to the shape of the first magnet 37c or first magnet 37d, which are arranged in a V-shape. This makes it easier to pass magnetic flux between the core hole 37f and the first magnets 37c, 37d, allowing for optimal magnetic flux flow within the rotor core 32. In addition, the circumferential dimensions of the plate through-hole 54 decrease as they extend radially outward. Therefore, it is easy to shape the plate through-hole 54 to conform to the shape of the core hole 37f, and it is easy to arrange the entire plate through-hole 54 to overlap the core hole 37f in the axial direction.

[0076] Furthermore, according to this embodiment, the second surface 52 is located radially inward from the magnet hole portion 36h. Therefore, the plate through-hole 54 provided in the second surface 52 and the step 58 provided between the second surface 52 and the third surface 53 can be positioned radially inward from the magnet hole portion 36h. This allows the plate through-hole 54 and the step 58 to be positioned in a location that is less likely to affect the magnetic flux flowing through the rotor core 32.

[0077] Furthermore, according to this embodiment, the circumferential dimension of the plate through-hole 54 is smaller than the circumferential distance between adjacent plate through-holes 54 in the circumferential direction. Therefore, the plate through-holes 54 can be made relatively small. This makes it easier to more effectively restrict the amount of oil O flowing into each plate through-hole 54, and further suppresses variations in the amount of oil O flowing into each plate through-hole 54.

[0078] Furthermore, according to this embodiment, the right surface 50b of the plate 50 is a flat surface. Therefore, the right surface 50b and the core piece portion 36 located on the right side of the plate 50 can be brought into suitable contact. As a result, even if the material constituting the plate 50 and the material constituting the core piece portion 36 are different materials, the plate 50 and the core piece portion 36 can be brought into suitable contact and connected.

[0079] Furthermore, according to this embodiment, the material constituting the plate 50 is non-magnetic. Therefore, the plate 50 does not affect the magnetic flux flowing through the rotor core 32. This prevents the plate 50 from obstructing the magnetic flux flowing through the rotor core 32 and suppresses uneven distribution of the oil O supplied to the rotor core 32 by the plate 50.

[0080] <Second Embodiment> In the following, the same components as those in the embodiments described above may be omitted from explanation by using the same reference numerals as appropriate. As shown in Figure 7, in the rotor 230 of this embodiment, the second shaft bore 233b extends at an oblique angle in the axial direction with respect to the radial direction. The second shaft bore 233b is located to the right (-Y side) as it extends radially outward. The opening 233c of the second shaft bore 233b opens to the outer circumferential surface of the shaft 231. In this embodiment, the axial dimension of the opening 233c, i.e., the inner diameter of the opening 233c, is smaller than the axial dimension of the gap G1. The entire opening 233c opens into the gap G1. The opening 233c opens in a direction facing the plate wall 59. The other components of the rotor 230 are the same as the other components of the rotor 30 of the first embodiment.

[0081] <Third Embodiment> In the following, components similar to those in the embodiments described above may be omitted from explanation by using the same reference numerals as appropriate. As shown in Figure 8, in the plate 350 of the rotor 330 of this embodiment, the plate wall portion 359 provided on the left surface 350a protrudes to the left (+Y side) from the first surface 51 and the second surface 352. Although not shown in the figure, the plate wall portion 359 is an annular shape centered on the central axis J, similar to the first embodiment. The left end of the plate wall portion 359 is located to the right (-Y side) of the third surface 53.

[0082] The second surface 352 is located to the right (-Y side) of the left (+Y side) end of the plate wall portion 359. Therefore, the plate wall portion 359 can prevent oil O that has flowed radially outward over the plate wall portion 359 into the gap between the second surface 352 and the core piece portion 36 from flowing back between the first surface 51 and the core piece portion 36. In this embodiment, the axial position of the second surface 352 is the same as the axial position of the first surface 51. The second surface 352 may be located to the right of the left end of the plate wall portion 359 and to the left of the first surface 51, or it may be located to the right of the first surface 51. The other configurations of the rotor 330 are the same as the other configurations of the rotor 30 in the first embodiment.

[0083] <Fourth Embodiment> In the following, the same components as those in the embodiments described above may be omitted from explanation by using the same reference numerals as appropriate. As shown in Figure 9, in the plate 450 of the rotor 430 of this embodiment, multiple plate wall portions 459 are arranged at intervals in the circumferential direction. The multiple plate wall portions 459 are arranged at equal intervals along the circumferential direction for a full rotation. Each plate wall portion 459 is substantially arc-shaped and extends in the circumferential direction. The plate wall portions 459 protrude to the left (+Y side) from the first surface 51 and the second surface 452.

[0084] In this embodiment, the second surfaces 452 are provided between adjacent plate wall portions 459 in the circumferential direction. Each second surface 452 is connected to the radially outer surface of the first surface 51 without any steps. Each second surface 452 is located to the right (-Y side) of each plate wall portion 459 than the left (+Y side) surface. Each second surface 452 protrudes radially outward from the first surface 51. Each second surface 452 is provided with one plate through-hole 54. The other configurations of the rotor 430 are the same as the other configurations of the rotor 30 in the first embodiment.

[0085] According to this embodiment, the second surface 452 is located between adjacent plate wall portions 459 in the circumferential direction and is connected to the radially outer side of the first surface 51 without any steps. Therefore, the oil O spread circumferentially by the plate wall portions 459 can flow from the second surface 452 to the plate through-hole 54 without having to cross over the plate wall portions 459 radially outward. This makes it easier for the oil O to flow into the plate through-hole 54.

[0086] The present invention is not limited to the embodiments described above, and other configurations and methods may be adopted within the scope of the technical idea of ​​the present invention. The axial surface on one side of the plate may have any configuration as long as it has a first surface and a second surface. The axial relative positional relationship between the first surface and the second surface is not particularly limited. The axial surface on one side of the plate does not have to have a third surface. The axial surface on the other side of the plate may be any surface. The axial surface on the other side of the plate may have a step. The multiple through holes in the plate may have any shape.

[0087] The plate wall portion may have any shape as long as it protrudes axially in one direction from the portion of the first surface located radially outward from the radial inner edge and extends circumferentially. The relative circumferential positional relationship between the plate wall portion and the second shaft hole portion is not particularly limited. The fluid passage that supplies fluid to the rotor core, etc., may have any structure. The fluid flowing through the passage may be of any type. The rotor core may not have a core hole portion. The rotor may be a rotor without skew. The rotor may have another member arranged axially between the plate and the core piece portion. In this case, fluid may flow from the second shaft hole portion into the axial gap between the other member and the first surface, and the axial gap between the other member and the second surface. The first shaft hole portion provided in the shaft may be a hole having a bottom on at least one of the axial sides.

[0088] The rotating electric machine to which the present invention applies is not limited to a motor, but may also be a generator. The application of the rotating electric machine is not particularly limited. The rotating electric machine may be mounted on equipment other than vehicles. The application of the drive device to which the present invention applies is not particularly limited. The drive device may be mounted on a vehicle for purposes other than rotating an axle, for example, or on equipment other than vehicles. The orientation of the rotating electric machine and the drive device when they are used is not particularly limited. The central axis of the rotating electric machine may be inclined with respect to a horizontal direction perpendicular to the vertical direction, or it may extend in the vertical direction. The configurations described herein can be combined as appropriate, within the bounds of mutual non-contradictory relationships. [Explanation of Symbols]

[0089] 10...Rotating electric machine, 30,230,330,430...Rotor, 31,231...Shaft, 32...Rotor core, 33a...First shaft hole, 33b,233b...Second shaft hole, 33c,233c...Opening, 36...Core piece, 36h...Magnet hole, 37...Magnet, 37f...Core hole, 38,38N,38S...Magnetic pole, 40...Stator, 50,350,450...Plate, 50a...Left side (one side of the plate in the axial direction), 50b...Right side (the other side of the plate in the axial direction), 51...First surface, 52,352,452...Second surface, 53...Third surface, 54...Plate through hole, 57,58...Step, 59,359,459...Plate wall, 60...Gear mechanism, 100...Drive unit, J...Central axis

Claims

1. A rotor that can rotate about a central axis, A shaft extending in the axial direction, A rotor core having multiple core pieces arranged in the axial direction and fixed to the outer surface of the shaft, An annular plate is positioned between adjacent core pieces in the axial direction and surrounds the shaft, Equipped with, The aforementioned shaft is A first shaft bore portion extending in the axial direction, The shaft has an opening that opens to the outer surface of the shaft and a second shaft hole that connects to the first shaft hole, It has, The axial side of the aforementioned plate is A first surface is provided on the radial inner edge of the plate and extends in the circumferential direction, A second surface located radially outward from the first surface, It has, The first and second surfaces are positioned away from the core piece portion located on one axial side of the plate, on the other axial side, and are annular in shape, surrounding the shaft. The aforementioned plate is The second surface is provided with a plurality of plate through holes arranged at intervals in the circumferential direction, A plate wall portion that protrudes axially from the portion of the first surface located radially outward from the radial inner edge and extends in the circumferential direction, It has, An annular gap surrounding the shaft is provided between the core piece portion located on one axial side of the plate and the second surface in the axial direction. The plurality of plate through holes open into the annular gap, forming a rotor.

2. The rotor according to claim 1, wherein the opening is opposite to the plate wall.

3. The rotor according to claim 1 or 2, wherein the plate wall portion is annular and surrounds the shaft.

4. The rotor according to any one of claims 1 to 3, wherein the circumferential position of the opening is the circumferential position between adjacent plate through holes in the circumferential direction.

5. The second surface is positioned to protrude more than the first surface in one axial direction. The first surface and the second surface are connected radially via a step, The rotor according to any one of claims 1 to 4, wherein the plate wall portion is formed by the step.

6. The rotor according to any one of claims 1 to 4, wherein the second surface is located on the other axial side of one axial end of the plate wall portion.

7. The axial side surface of the plate has a third surface connected to the radially outer side of the second surface via a step. The rotor according to any one of claims 1 to 6, wherein the third surface is positioned to protrude more than the second surface in one axial direction.

8. The third surface is an annular shape surrounding the shaft, The rotor according to claim 7, wherein the radial outer edge of the plate through hole is located at the radial outer edge of the second surface.

9. The rotor core has a plurality of core holes that extend in the axial direction and are spaced apart in the circumferential direction. The rotor according to any one of claims 1 to 8, wherein the plurality of core holes are each connected to the plurality of plate through holes.

10. The entirety of the plate through-hole overlaps with the core hole when viewed in the axial direction. The rotor according to claim 9, wherein the plate through-hole is smaller than the core hole when viewed in the axial direction.

11. It is equipped with multiple magnetic poles that are spaced apart in the circumferential direction, The rotor according to claim 9 or 10, wherein the circumferential position of the plate through hole and the circumferential position of the core hole include the circumferential center position between adjacent magnetic pole portions in the circumferential direction.

12. The circumferential dimensions of the core hole portion decrease as they move radially outward. The rotor according to claim 11, wherein the circumferential dimensions of the plate through-holes decrease as they move radially outward.

13. The aforementioned magnetic pole portion has a magnetic hole portion in which a magnet is placed, The rotor according to claim 11 or 12, wherein the second surface is located radially inward from the magnet hole.

14. The rotor according to any one of claims 1 to 13, wherein the circumferential dimension of the plate through-hole is smaller than the circumferential distance between adjacent plate through-holes in the circumferential direction.

15. The rotor according to any one of claims 1 to 14, wherein the other axial surface of the plate is a flat surface.

16. The rotor according to any one of claims 1 to 15, wherein the material constituting the plate is a non-magnetic material.

17. A rotor according to any one of claims 1 to 16, A stator facing the rotor with a gap in between, A rotating electric machine equipped with the following features.

18. The rotating electric machine according to claim 17, A gear mechanism connected to the aforementioned rotating electric machine, A drive device equipped with the following features.

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