Rotating electric machines and drive systems

Abstract

To efficiently cool the rotor core. [Solution] The rotor has a shaft, a rotor core 24, a first plate and a second plate 7 located on one and the other axial side of the rotor core, respectively, and a fixing part 5. Between the first plate and the rotor core, there is a first flow channel connecting a shaft hole provided in the shaft and a first hole 24a provided in the rotor core. Between the second plate and the rotor core, there is a second flow channel 72 connected to the first hole. When the first plate and the second plate are not pressed against the rotor core, the second contact surface 70p of the second plate is inclined in a direction that approaches the rotor core as it moves away from the central axis, and the angle between the plane perpendicular to the central axis and the second contact surface of the second plate is greater than the angle between the plane perpendicular to the central axis and the first contact surface of the first plate.

Description

Technical Field

[0001] The present invention relates to a rotating electrical machine and a drive device.

Background Art

[0002] Along with the growing interest in electric vehicles in recent years, various studies on methods for cooling rotating electrical machines have been progressing. For example, a structure is known in which oil supplied from the inside of a rotor shaft is guided into the interior of a rotor core by plates arranged at both axial ends of the rotor core to cool the core (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a fluid is guided into the interior of a rotor core using plates, if the contact between the plates and the rotor core is insufficient, the fluid may leak out from between the plates and the rotor core. In this case, there is a problem that the rotor cannot be sufficiently cooled.

[0005] In view of the above circumstances, one of the objectives of the present invention is to more efficiently cool the rotor core in a rotating electrical machine and a drive device.

Means for Solving the Problems

[0006] One embodiment of the rotating electric machine of the present invention comprises a rotor rotatable about a central axis and a stator radially opposite to the rotor. The rotor has a shaft extending axially about the central axis, a rotor core having a central hole through which the shaft passes, a first plate located on one axial side of the rotor core, a second plate located on the other axial side of the rotor core, and fixed portions located on one axial side of the first plate and the other axial side of the second plate, respectively. The shaft is provided with a hollow portion extending axially and a shaft hole portion extending radially outward from the hollow portion and opening on the outer circumferential surface of the shaft. The rotor core is provided with a first hole portion that penetrates axially. A first flow path portion connecting the shaft hole portion and the first hole portion is provided on at least one of the mutually opposing surfaces of the first plate and the rotor core. A second flow path portion connected to the first hole portion is provided on at least one of the mutually opposing surfaces of the second plate and the rotor core. The first plate has a first contact surface that is pressed against the rotor core by the fixing portion and contacts the rotor core in the axial direction. The second plate has a second contact surface that is pressed against the rotor core by the fixing portion and contacts the rotor core in the axial direction. The opening on the other axial side of the first hole is located radially inward from the radially outer edge of the second contact surface. When the first and second plates are not pressed against the rotor core by the fixing portion, the second contact surface is inclined toward the rotor core as it moves away from the central axis, and the angle between the plane perpendicular to the central axis and the second contact surface is greater than the angle between the plane perpendicular to the central axis and the first contact surface.

[0007] One aspect of the drive device of the present invention comprises the above-mentioned rotating electric machine and a power transmission unit that transmits power from the rotating electric machine. [Effects of the Invention]

[0008] According to one aspect of the present invention, the rotor core can be cooled more efficiently in a rotating electric machine and a drive device. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a conceptual diagram of a drive device according to one embodiment. [Figure 2] Figure 2 is an exploded perspective view of a rotor according to one embodiment. [Figure 3] Figure 3 is a front view of a rotor core and multiple magnets according to one embodiment. [Figure 4] Figure 4 is a magnified view of a portion of Figure 3. [Figure 5] Figure 5 is a cross-sectional view along the VV line in Figure 4. [Figure 6] Figure 6 is a schematic cross-sectional view of the first plate according to one embodiment. [Figure 7] Figure 7 is a schematic cross-sectional view of the second plate in one embodiment. [Figure 8] Figure 8 shows the back surface of the first plate in one embodiment. [Figure 9] Figure 9 shows the back surface of the second plate in one embodiment. [Figure 10] Figure 10 is a schematic diagram showing a part of the rotor of Modification 1. [Figure 11] Figure 11 is a schematic diagram showing a part of the rotor of the modified example 2. [Modes for carrying out the invention]

[0010] The following describes in detail embodiments to which the present invention is applied with reference to the drawings. In the following description, unless otherwise specified, the direction parallel to the central axis J1 of the rotating electric machine 2 (Y-axis direction) will be simply referred to as the "axial direction," the radial direction centered on the central axis J1 will be simply referred to as the "radial direction," and the circumferential direction centered on the central axis J1, that is, the direction around the axis of the central axis J1, will be simply referred to as the "circumferential direction." In the following description, the side to which the Y-axis arrow points in each figure will be referred to as the "one axial side," and the opposite side will be referred to as the "other axial side." The drive device 1 of this embodiment will be described as being arranged so that the central axis J1 is parallel to the horizontal direction, but the orientation of the central axis J1 is not necessarily limited.

[0011] <Driving device> Figure 1 is a schematic diagram of a driving device 1 according to an embodiment. The driving device 1 of the present embodiment is mounted on a vehicle that uses a rotating electrical machine as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid electric vehicle (PHV), and an electric vehicle (EV), and is used as the power source thereof.

[0012] The driving device 1 includes a rotating electrical machine 2, a power transmission unit 50, a housing 3 that accommodates the rotating electrical machine 2 and the power transmission unit 50, a pump 8A, and a cooler 8B. The driving device 1 may further include an inverter (not illustrated) that controls the rotating electrical machine 2.

[0013] <Power transmission unit> The power transmission unit 50 is connected to a shaft 21 of a rotor 20 to be described later to transmit the power of the rotating electrical machine 2. The power transmission unit 50 has a second shaft 55, a first gear 51, a second gear 52, a third gear 53, and a differential device 56. The differential device 56 has a ring gear 56g and a pair of output shafts 57. Wheels (not illustrated) are connected to the pair of output shafts 57 respectively. The output shafts 57 rotate around an output axis J3 that is parallel to the central axis J1.

[0014] The first gear 51 is provided on the outer peripheral surface of the shaft 21. The second shaft 55 rotates around an intermediate axis J2 that is parallel to the central axis J1. The second gear 52 and the third gear 53 are provided on the outer peripheral surface of the second shaft 55. The second gear 52 meshes with the first gear 51. The third gear 53 meshes with the ring gear 56g of the differential device 56. When the vehicle turns, the differential device 56 transmits the torque transmitted from the third gear 53 to the output shafts 57 while absorbing the speed difference between the left and right wheels. The torque output from the rotating electrical machine 2 is transmitted to the ring gear 56g of the differential device 56 via the first gear 51, the second gear 52, the second shaft 55, and the third gear 53, and is output to the pair of output shafts 57 via the differential mechanism portion of the differential device 56.

[0015] <Housing> Inside the housing 3, a first accommodation space 3A in which the rotating electric machine 2 is accommodated and a second accommodation space 3B in which the power transmission unit 50 is accommodated are provided. The fluid O is stored in the lower part of the second accommodation space 3B. The fluid O accumulated in the lower part of the second accommodation space 3B is supplied to the tooth surfaces of each gear by being scooped up by any gear of the power transmission unit 50.

[0016] The fluid O of the present embodiment functions as a lubricating oil that lubricates the bearing B, the power transmission unit (not shown in the drawings), and the like. Further, the fluid O functions as a refrigerant that cools the rotating electric machine 2. As the fluid O, for example, oil equivalent to lubricating oil for automatic transmissions (ATF: Automatic Transmission Fluid) having a relatively low viscosity is used.

[0017] The housing 3 is provided with a flow path 9. The flow path 9 is a path that supplies the fluid O from the lower part of the second accommodation space 3B to the rotor flow path 29 of the rotating electric machine 2. A part of the flow path 9 is, for example, a hole portion provided in the wall of the housing 3. A part of the flow path 9 may be, for example, a pipe arranged in the internal space of the housing 3 or outside the housing. A pump 8A and a cooler 8B are provided in the middle of the flow path 9. The pump 8A pressure-feeds the fluid O in the flow path 9 to the downstream side. The cooler 8B cools the fluid O in the flow path 9.

[0018] <Rotating Electric Machine> The rotating electric machine 2 of the present embodiment is an inner rotor type three-phase AC motor. The rotating electric machine 2 has both a function of outputting power as a motor and a function of generating electric power as a generator. The rotating electric machine 2 may be used as either a motor or a generator. Further, the configuration of the rotating electric machine 2 is not limited to the present embodiment, and may be, for example, a DC motor or an AC motor with four or more phases. The rotating electric machine 2 includes a rotor 20 that is rotatable around a central axis J1, and a stator 30 that faces the rotor 20 in the radial direction.

[0019] <Stator> The stator 30 is held in the housing 3. The stator 30 surrounds the rotor 20 from the radially outer side. The stator 30 has a substantially annular stator core 32 centered on the central axis J1, a coil 31 mounted on the stator core 32, and an insulator (not shown) interposed between the stator core 32 and the coil 31. The stator core 32 has a substantially annular core back portion 32a and a plurality of tooth portions 32b extending radially inward from the core back portion 32a. The plurality of tooth portions 32b are arranged in a line along the circumferential direction. Coil wires are arranged between the tooth portions 32b that are arranged in the circumferential direction. Coil wires located between adjacent tooth portions constitute the coil 31.

[0020] <Rotor> Figure 2 is an exploded perspective view of the rotor 20 of this embodiment. The rotor 20 includes a shaft 21, a rotor core 24, a plurality of magnets 25, a first plate 6, a second plate 7, and a pair of fixing parts 5.

[0021] As shown in Figure 1, the shaft 21 extends axially with respect to the central axis J1. The shaft 21 has a first shaft portion 21A located in the first housing space 3A of the housing 3, and a second shaft portion 21B located in the second housing space 3B. The first shaft portion 21A and the second shaft portion 21B are a single member arranged coaxially. The rotor core 24 is fixed to the first shaft portion 21A. The second shaft portion 21B is located on one axial side (+Y) of the first shaft portion 21A. A first gear 51 is provided on the outer circumferential surface of the second shaft portion 21B. Note that the first shaft portion 21A and the second shaft portion 21B may be separate members connected to each other.

[0022] The shaft 21 is rotatable about the central axis J1. The shaft 21 is provided with a hollow section 21a, an extension hole 21c connected to the hollow section 21a and extending in the axial direction, and a plurality (eight in this embodiment) of shaft holes 21b connected to the hollow section 21a and extending in the radial direction.

[0023] The hollow portion 21a is a circular hole centered on the central axis J1 when viewed from the axial direction. The hollow portion 21a extends along the axial direction and opens at the other axial end (-Y) of the shaft 21. In this embodiment, the hollow portion 21a is provided in the first shaft portion 21A. In the following description, the axial end (+Y) of the hollow portion 21a is referred to as the bottom portion 21aa. The bottom portion 21aa is located one axial side (+Y) from the end face (first end face 24e, described later) of the rotor core 24 facing one axial side (+Y). The bottom portion 21aa is also located on the other axial side (-Y) from the second housing space 3B.

[0024] The extension hole 21c extends from the bottom 21aa of the hollow portion 21a in one axial direction (+Y) and opens at the end of the shaft 21 on one axial direction (+Y). The extension hole 21c is a circular hole centered on the central axis J1 when viewed from the axial direction. The diameter of the extension hole 21c is smaller than the diameter of the hollow portion 21a. The hollow portion 21a and the extension hole 21c can also be considered as a single through hole with a step in the bottom 21aa. The extension hole 21c may be omitted.

[0025] The shaft bore 21b extends radially outward from the hollow portion 21a and opens on the outer circumferential surface of the shaft 21. That is, the shaft bore 21b penetrates the wall of the shaft 21 radially from the inner circumferential surface to the outer circumferential surface of the shaft 21. Multiple shaft bore 21b are arranged circumferentially with spacing between them.

[0026] As shown in Figure 2, the rotor core 24 is columnar in shape and extends in the axial direction. The rotor core 24 has a first end face 24e facing one axial direction (+Y) and a second end face 24f facing the other axial direction (-Y). The first end face 24e and the second end face 24f are flat surfaces perpendicular to the central axis J1. A first plate 6 is attached to the first end face 24e, and a second plate 7 is attached to the second end face 24f.

[0027] The rotor core 24 is made of a magnetic material. The rotor core 24 is made up of, for example, multiple plate members (such as electromagnetic steel sheets) stacked in the axial direction. The multiple plate members may be stacked with their positions in the circumferential direction shifted one by one or in groups. In other words, the rotor core 24 may be skewed or step-skewed.

[0028] Figure 3 is a front view of the rotor core 24 and the multiple magnets 25 of this embodiment. The rotor 20 is provided with multiple magnetic poles 20P. In this embodiment, the rotor 20 is provided with eight magnetic poles 20P, including four north poles and four south poles. The north poles 20P and south poles 20P are arranged alternately in the circumferential direction.

[0029] As shown in Figure 3, the rotor 20 is assumed to have multiple first virtual lines Ld and multiple second virtual lines Lq. The first virtual line Ld passes along the d-axis of the rotor 20 when viewed from the axial direction. The first virtual line Ld extends in the d-axis direction of the rotor 20 and indicates the direction of the main magnetic flux. On the other hand, the second virtual line Lq passes along the q-axis of the rotor 20. The second virtual line Lq extends in the q-axis direction of the rotor 20 and is electrically perpendicular to the direction in which the first virtual line Ld extends. The first virtual line Ld and the second virtual line Lq are arranged alternately along the circumferential direction. In Figure 3, only some of the first virtual lines Ld and some of the second virtual lines Lq are shown, but the rotor 20 is assumed to have the same number of first virtual lines Ld and second virtual lines Lq as the number of magnetic poles 20P.

[0030] The rotor core 24 is provided with a central hole 24d, a plurality of magnet holes 24h, a plurality of first holes 24a, a plurality of second holes 24b, and a third hole 24c. The central hole 24d, magnet holes 24h, first holes 24a, second holes 24b, and third holes 24c extend axially and penetrate the rotor core 24 in the axial direction. The central hole 24d, magnet holes 24h, first holes 24a, second holes 24b, and third holes 24c open axially at the first end face 24e and the second end face 24f of the rotor core 24.

[0031] Furthermore, if the rotor core 24 is skewed or stepped skewed, the magnet holes 24h, the first hole portion 24a, the second hole portion 24b, and the third hole portion 24c may extend in a substantially spiral shape while shifting their circumferential positions along the axial direction.

[0032] The central hole 24d extends axially with respect to the central axis J1. In this embodiment, the central hole 24d is substantially circular when viewed from the axial direction. The shaft 21 passes through the central hole 24d. Multiple protrusions 24g project radially inward from the inner surface of the central hole 24d. The protrusions 24g extend linearly along the axial direction. The multiple protrusions 24g are spaced apart along the circumferential direction. The protrusions 24g are inserted into grooves (not shown) provided on the outer circumference of the shaft 21. This positions the rotor core 24 circumferentially with respect to the shaft 21.

[0033] Multiple first holes 24a are arranged in a line along the circumferential direction. In this embodiment, multiple first holes 24a are arranged at equal intervals along the circumferential direction. The first holes 24a are arranged on the second imaginary line Lq when viewed from the axial direction. The first holes 24a are roughly triangular in shape with rounded corners that are convex radially inward when viewed from the axial direction. The shape of the first holes 24a is not limited to this embodiment. The shape of the first holes 24a may be, for example, circular, elliptical, polygonal, etc., when viewed from the axial direction.

[0034] Multiple second holes 24b are arranged in a line along the circumferential direction. In this embodiment, multiple second holes 24b are arranged at equal intervals along the circumferential direction. The second holes 24b are arranged on the first imaginary line Ld when viewed from the axial direction. The second holes 24b are roughly triangular in shape with rounded corners that are convex radially inward when viewed from the axial direction. The shape of the second holes 24b is not limited to this embodiment. The shape of the second holes 24b may be, for example, circular, elliptical, polygonal, etc., when viewed from the axial direction.

[0035] Multiple third holes 24c are arranged in a line along the circumferential direction. The multiple third holes 24c are located radially inward from the first hole 24a, the second hole 24b, and the magnet hole 24h. By providing the third holes 24c, the rotor core 24 can be made lighter.

[0036] Multiple magnet holes 24h are arranged in a line along the circumferential direction. Each of the multiple magnet holes 24h houses a magnet 25. The multiple magnet holes 24h include multiple first magnet holes 24p and multiple second magnet holes 24q. In this embodiment, the number of first magnet holes 24p is the same as the number of second magnet holes 24q. A total of four magnets 25, arranged in two first magnet holes 24p and two second magnet holes 24q, constitute one magnetic pole 20P. Here, the set of four magnet holes 24h that house the four magnets 25 constituting one magnetic pole 20P is called a hole group G. Also, two first magnet holes 24p belonging to one hole group G are called a first hole pair P, and two second magnet holes 24q belonging to one hole group G are called a second hole pair Q. The rotor core 24 of this embodiment is provided with eight sets of hole groups G. Furthermore, one hole group G includes one first hole pair P and one second hole pair Q. The first hole pair P and the second hole pair Q of one hole group G are arranged radially side by side. The two first magnet holes 24p of one first hole pair P are adjacent in the circumferential direction. Similarly, the two second magnet holes 24q of one second hole pair Q are adjacent in the circumferential direction.

[0037] A second hole portion 24b is located in the region surrounded by the four magnet holes 24h of one hole group G. The second hole portion 24b is located between the pair of first magnet holes 24p that constitute the first hole pair P in the circumferential direction. The second hole portion 24b is located radially inward of the pair of second magnet holes 24q that constitute the second hole pair Q. In the radial direction, the second hole portion 24b is located between the first hole pair P and the second hole pair Q of one hole group G.

[0038] The two first magnet holes 24p of the first hole pair P are arranged symmetrically with respect to the first virtual line Ld when viewed from the axial direction. The first magnet hole 24p on one side (+φ side) in the circumferential direction with respect to the first virtual line Ld extends toward the other side (+φ side) in the circumferential direction as it moves radially outward. Similarly, the first magnet hole 24p on the other side (-φ side) in the circumferential direction with respect to the first virtual line Ld extends toward the other side (-φ side) in the circumferential direction as it moves radially outward. In other words, the pair of first magnet holes 24p of the first hole pair P are spaced apart from each other in the circumferential direction and extend circumferentially away from each other as it moves radially from the inside to the radially outside when viewed from the axial direction.

[0039] The two second magnet holes 24q of the second hole pair Q are arranged symmetrically with respect to the first virtual line Ld when viewed from the axial direction. The second magnet hole 24q on one side (+φ side) in the circumferential direction with respect to the first virtual line Ld extends toward the other side (+φ side) in the circumferential direction as it moves radially outward. Similarly, the second magnet hole 24q on the other side (-φ side) in the circumferential direction with respect to the first virtual line Ld extends toward the other side (-φ side) in the circumferential direction as it moves radially outward. In other words, the pair of second magnet holes 24q of the second hole pair Q are spaced apart from each other in the circumferential direction and extend circumferentially away from each other as it moves radially from the inside to the radially outside when viewed from the axial direction. When viewed from the axial direction, the angle between the pair of second magnet holes 24q of the second hole pair Q is greater than the angle between the pair of first magnet holes 24p of the first hole pair P. The second magnet hole 24q is located radially outward from the first magnet hole 24p, which belongs to the same hole group G.

[0040] (magnet) One magnet 25 is placed in each magnet hole 24h. In this embodiment, the magnets 25 are fixed by a resin portion 26 that fills the magnet hole 24h. The magnets 25 may also be fixed in the magnet hole 24h by fixing means such as crimping or press-fitting. The type of magnet 25 is not particularly limited. The magnet 25 may be, for example, a neodymium magnet or a ferrite magnet. In this embodiment, the magnet 25 is a rectangular parallelepiped that is long in the axial direction. Therefore, the magnet 25 of this embodiment is substantially rectangular when viewed from the axial direction. More specifically, the magnet 25 of this embodiment is substantially rectangular when viewed from the axial direction. The magnet 25 extends, for example, from one end in the axial direction to the other end in the axial direction of the rotor core 24. The magnet 25 may be divided into multiple parts in the axial direction or in a direction perpendicular to the axial direction.

[0041] In the following description, the magnet 25 placed in the first magnet hole 24p will be referred to as the first magnet 25p, and the magnet 25 placed in the second magnet hole 24q will be referred to as the second magnet 25q. The magnetic pole 20P contains a total of four magnets 25: two second magnets 25q and two first magnets 25p. In this embodiment, the number of first magnets 25p and second magnets 25q are equal.

[0042] Two first magnets 25p belonging to one magnetic pole 20P are arranged symmetrically in the circumferential direction with respect to the first imaginary line Ld. Furthermore, within one magnetic pole 20P, the two first magnets 25p are spaced further apart from each other as they extend radially outward. Two second magnets 25q belonging to one magnetic pole 20P are arranged symmetrically in the circumferential direction with respect to the first imaginary line Ld, radially outside the first magnets 25p. Furthermore, within one magnetic pole 20P, the two second magnets 25q are spaced further apart from each other as they extend radially outward. The first magnets 25p and the second magnets 25q each have their magnetization direction in the thickness direction. The two first magnets 25p and the two second magnets 25q constituting one magnetic pole 20P each face the same pole radially outward. For example, if the polarity of the radially outward-facing faces of the two first magnets 25p is north pole (or south pole), then the polarity of the radially outward-facing faces of the two second magnets 25q will also be north pole (or south pole).

[0043] Figure 4 is a magnified view of a portion of Figure 3. As shown in Figure 4, the internal space of the magnet hole 24h is provided with a housing portion 24ha, a gap 24hc, and two flux barriers 24hb. In addition, the inner surface of the magnet hole 24h is provided with a pair of opposing surfaces 24hf that face each other in the radial direction.

[0044] The opposing surfaces 24hf are flat surfaces. In one magnet hole 24h, the distance between the opposing surfaces 24hf is slightly greater than the thickness of the magnet 25. Of the pair of opposing surfaces 24hf, the magnet 25 is in contact with the radially inward surface, while the other radially outward surface faces the magnet 25 with a gap 24hc between them.

[0045] The containment section 24ha is the portion of the internal space of the magnet hole 24h in which the magnet hole 24h is housed. The containment section 24ha is approximately rectangular in shape, with the direction in which the magnet 25 extends being its longitudinal direction when viewed from the axial direction. The gap 24hc is provided between the containment section 24ha and the opposing surface 24hf. A pair of flux barriers 24hb are connected to both ends of the magnet hole 24h in the longitudinal direction.

[0046] The resin part 26 fills the flux barrier 24hb and gap 24hc of the magnet hole 24h. The resin part 26 fixes the magnet 25 inside the magnet hole 24h.

[0047] Figure 5 is a cross-sectional view along the VV line in Figure 4, illustrating the molding method of the resin part 26. Note that Figure 5 illustrates the means for fixing the first magnet 25p to the inner surface of the first magnet hole 24p. However, the same means applies to fixing the second magnet 25q to the inner surface of the second magnet hole 24q.

[0048] As shown in Figure 4, the axial dimension h of the magnet 25 is smaller than the axial dimension H of the rotor core 24. According to this embodiment, even if the axial dimensions of the magnet 25 and the rotor core 24 vary within the dimensional tolerance range, it is possible to suppress the magnet 25 from axially protruding from the end faces 24e and 24f of the rotor core 24. In the following description, the surface of the magnet 25 facing one axial side (+Y) will be called the first magnet surface 25a, and the surface of the magnet 25 facing the other axial side (-Y) will be called the second magnet surface 25b.

[0049] Figure 4 shows a mold 90 used in the molding process of the resin part 26. The mold 90 has a first mold 91, a second mold 92, and a slide part 93. In the molding process of the resin part 26, the first mold 91 is located on one axial side (+Y) of the stator core, and the second mold 92 and slide part 93 are located on the other axial side (-Y). In the molding process of the resin part 26, the rotor core 24, with the magnets 25 housed in the magnet holes 24h, is sandwiched from both axial sides by the first mold 91 and the second mold 92.

[0050] The first mold 91 has a first retaining surface 91f and a plurality (two in this embodiment) of retaining protrusions 91a. The first retaining surface 91f faces the other axial side (-Y) and contacts the first end face 24e of the stator core. The retaining protrusions 91a project from the first retaining surface 91f in the other axial side (-Y). The retaining protrusions 91a are located inside the magnet hole 24h. The retaining protrusions 91a are, for example, cylindrical protrusions. The tip surface of the retaining protrusions 91a contacts the first magnet surface 25a and supports the magnet 25 from one axial side (+Y). For this reason, a gap is provided between the first magnet surface 25a and the first retaining surface 91f.

[0051] The second mold 92 has a second retaining surface 92f that faces one axial side (+Y) and contacts the second end face 24f of the stator core. The second mold 92 is provided with a slide support hole 92h that opens into the second retaining surface 92f. The slide support hole 92h has substantially the same shape as the magnet hole 24h when viewed from the axial direction.

[0052] The slide portion 93 is housed in the slide support hole 92h. When viewed from the axial direction, the slide portion 93 has substantially the same shape as the slide support hole 92h. The slide portion 93 extends axially with a substantially uniform cross-sectional shape. The slide portion 93 has a third retaining surface 93f facing one side (+Y) in the axial direction.

[0053] The slide portion 93 is movable axially within the slide support hole 92h by a mechanism (not shown). During the molding process of the resin portion 26, a part of the slide portion 93 enters the inside of the magnet hole 24h and contacts the second magnet surface 25b at the third holding surface 93f. As a result, the slide portion 93 supports the magnet 25 from the other axial side (-Y).

[0054] The magnet 25 is positioned inside the magnet hole 24h by being sandwiched between the retaining projection 91a and the sliding portion 93. According to this embodiment, the first magnet surface 25a is located axially to the other side (-Y) of the first end face 24e of the rotor core 24 by the height of the retaining projection 91a. The second magnet surface 25b is located axially to one side (+Y) of the second end face 24f. The axial dimension h of the magnet 25 and the axial dimension H of the rotor core 24 are related such that the position of the second magnet surface 25b is axially to one side (+Y) of the second end face 24f, thereby suppressing the magnet 25 from protruding from the second end face 24f of the rotor core 24.

[0055] The slide portion 93 is provided with a gate Gt for discharging the uncured resin material into the magnet hole 24h. The gate Gt opens, for example, into one of the flux barriers 24hb. The uncured resin portion 26 discharged from the gate Gt into one of the flux barriers 24hb passes between the first holding surface 91f and the magnet 25, and then flows around to the other flux barrier 24hb and the gap 24hc (see Figure 4) where it hardens.

[0056] In this embodiment, since the resin portion 26 wraps around between the first magnet surface 25a and the first retaining surface 91f, most of the first magnet surface 25a is covered by the resin portion 26. Furthermore, the portion of the first magnet surface 25a that contacts the retaining projection 91a is exposed on one axial side (+Y). Therefore, as shown in Figure 2, a circular recess 26a is formed on the surface of the resin portion 26 facing one axial side (+Y) as a trace of the retaining projection 91a.

[0057] According to this embodiment, since most of the first magnet surface 25a is covered by the resin part 26, even if a part of the magnet 25 is damaged, it is possible to suppress the scattering of fragments of the magnet 25 to the outside through the opening on one axial side (+Y) of the magnet hole 24h.

[0058] On the other hand, as shown in Figure 5, the second magnet surface 25b is supported by the second holding surface 92f of the mold 90 and is therefore exposed on the other axial side (-Y). Also, since the second magnet surface 25b is located on one axial side (+Y) of the second end surface 24f of the rotor core 24, a recess 20a is provided on the rotor 20 on the other axial side (-Y) of the second end surface 24f, recessing in one axial side (+Y) from the second end surface 24f. In other words, the rotor 20 is provided with a recess 20a. The recess 20a is covered by the second plate 7, which will be described later.

[0059] <Fixed part> As shown in Figure 2, the fixing part 5 is a substantially annular member. The fixing part 5 is made of a highly rigid metal material such as steel. The fixing part 5 is press-fitted onto the outer circumferential surface of the shaft 21. In this way, the fixing part 5 is fixed to the shaft 21. As shown in Figure 1, in this embodiment, the first plate 6 is positioned in the axial direction between the rotor core 24 and the fixing part 5. The second plate 7 is also positioned in the axial direction between the rotor core 24 and the fixing part 5. That is, the fixing part 5 is located on one axial side (+Y) of the first plate 6 and on the other axial side (-Y) of the second plate 7. By sandwiching the first plate 6 or the second plate 7 between the fixing part 5 and the rotor core 24, the first plate 6 or the second plate 7 is prevented from detaching from the shaft 21 in the axial direction.

[0060] The two fixing parts 5 provided on the rotor 20 in this embodiment are the same shape. However, the two fixing parts 5 may have different shapes. Also, one of the two fixing parts 5 may be part of the shaft 21. For example, one of the two fixing parts 5 may be a flange portion that protrudes radially outward from the shaft 21.

[0061] <Plate 1 and Plate 2> As shown in Figure 2, the first plate 6 is located on one axial side (+Y) of the rotor core 24 and covers the first end face 24e. The second plate 7 is located on the other axial side (-Y) of the rotor core 24 and covers the second end face 24f. When the rotating electric machine 2 is driven, the first plate 6 and the second plate 7 rotate integrally with the rotor core 24 around the central axis J1.

[0062] The first plate 6 and the second plate 7 in this embodiment are made of an aluminum alloy and are formed, for example, by aluminum die casting. The first plate 6 and the second plate 7 may also be made of a resin material or other metal material. The first plate 6 and the second plate 7 may be formed not only by aluminum die casting but also by other methods such as cutting or press working.

[0063] In this embodiment, the first plate 6 and the second plate 7 each cover a plurality of magnet holes 24h of the rotor core 24. As a result, the first plate 6 and the second plate 7 prevent the magnets 25 from detaching from the magnet holes 24h. Furthermore, even if a part of the magnet 25 is damaged, the first plate 6 and the second plate 7 prevent fragments of the magnet 25 from detaching from the rotor 20.

[0064] Figure 6 is a schematic cross-sectional view of the first plate 6 when it is not pressed against the rotor core 24 by the fixing part 5. Figure 7 is a schematic cross-sectional view of the second plate 7 when it is not pressed against the rotor core 24 by the fixing part 5.

[0065] In the following description, the state in which the first plate 6 or second plate 7 is pressed against and fixed to the rotor core 24 by the fixing part 5 is referred to as the "fixed state." On the other hand, the state of the first plate 6 or second plate 7 as a standalone component that is not pressed against the rotor core 24 by the fixing part 5 is referred to as the "component state." No external force is applied to the first plate 6 and second plate 7 in the component state. On the other hand, the first plate 6 and second plate 7 in the fixed state may undergo elastic deformation due to being sandwiched between the fixing part 5 and the rotor core 24 and receiving force from the fixing part 5 and the rotor core 24.

[0066] As shown in Figure 6, the first plate 6 has a first main body portion 60, a first rib portion 69, and a first base portion 68.

[0067] The first main body portion 60 is plate-shaped and extends perpendicular to the axial direction. When viewed from the axial direction, the first main body portion 60 is approximately circular with the central axis J1 as its center. In other words, the first main body portion 60 is approximately disc-shaped.

[0068] The first main body portion 60 has a first surface 60a facing the rotor core 24, a second surface 60b facing the opposite side of the first surface 60a in the axial direction, and an outer surface 60c facing radially outward. That is, the first plate 6 has a first surface 60a, a second surface 60b, and an outer surface 60c. The first surface 60a faces the first end surface 24e of the rotor core 24 and at least a portion of it is in contact with it.

[0069] Figure 8 shows the back surface of the first plate 6 as viewed from the first surface 60a side. The first main body portion 60 is provided with a first shaft insertion hole 60h, a plurality of through holes 63, a plurality of first flow channels 61, a plurality of first recesses 65, and a plurality of third recesses 66. That is, the first plate 6 has a first shaft insertion hole 60h, a plurality of through holes 63, a plurality of first flow channels 61, a plurality of first recesses 65, and a plurality of third recesses 66. The first shaft insertion hole 60h and the plurality of through holes 63 penetrate the first plate 6 in the axial direction. The plurality of first flow channels 61, the plurality of first recesses 65, and the plurality of third recesses 66 are provided on the first surface 60a and are recesses that are recessed in one axial direction (+Y) relative to the first surface 60a.

[0070] The first shaft insertion hole 60h is approximately circular when viewed from the axial direction, with the central axis J1 as its center. The shaft 21 is inserted into the first shaft insertion hole 60h. The inner diameter of the first shaft insertion hole 60h is slightly larger than the outer diameter of the shaft 21. Multiple (two in this embodiment) protrusions 60g are provided on the inner surface of the first shaft insertion hole 60h, projecting radially inward. The two protrusions 60g are positioned on opposite sides of the central axis J1. The protrusions 60g are inserted into grooves 21g provided on the outer circumferential surface of the shaft 21. This positions the first plate 6 circumferentially with respect to the shaft 21.

[0071] In this embodiment, the first plate 6 is provided with eight through holes 63. The multiple through holes 63 are arranged in the circumferential direction. The multiple through holes 63 in this embodiment are arranged at equal intervals in the circumferential direction. The through holes 63 have an elongated shape, with the longitudinal direction being perpendicular to the radial direction when viewed from the axial direction. Note that the shape of the through holes 63 is not limited to this embodiment. The through holes 63 open into the first surface 60a and the second surface 60b of the first main body portion 60.

[0072] The through-hole 63 overlaps with the second hole portion 24b when viewed from the axial direction. In this embodiment, the through-hole 63 overlaps with the entire second hole portion 24b when viewed from the axial direction. However, it is sufficient for the through-hole 63 to overlap with at least a portion of the second hole portion 24b when viewed from the axial direction.

[0073] The first flow channel 61 is provided on the first surface 60a. In this embodiment, the first flow channel 61 is a groove extending radially outward from the inner edge of the first surface 60a. In this specification, "inner edge" means the edge on the radial side, and "outer edge" means the edge on the radial side. When the first plate 6 is attached to the rotor core 24, the axial opening of the first flow channel 61 is covered by the first end face 24e of the rotor core 24 (see Figure 1). In this embodiment, the first plate 6 is provided with eight first flow channel 61. In this embodiment, the multiple first flow channel 61 are arranged at equal intervals in the circumferential direction. Also, the first flow channel 61 is located radially inward from the through hole 63.

[0074] The first flow channel 61 has an inner end 61a that is radially inward and an outer end 61b that is radially outward. The inner end 61a opens to the inner edge of the first plate 6. The inner end 61a connects to the shaft hole 21b of the shaft 21. The outer end 61b is located radially inward from the outer edge of the first plate 6. The outer end 61b overlaps with at least a portion of the first hole 24a when viewed from the axial direction. The first flow channel 61 connects the shaft hole 21b and the first hole 24a.

[0075] The first recess 65 is provided on the first surface 60a. In this embodiment, the first plate 6 is provided with eight first recesses 65. The first recesses 65 are located between two through holes 63 that are adjacent to each other in the circumferential direction. The first recesses 65 are also located radially outward from the first flow channel 61.

[0076] The first recess 65 has a first liquid collection section 65a and a first discharge groove section 65b. The first liquid collection section 65a in this embodiment is a roughly triangular shape with rounded corners that are convex radially outward. The first discharge groove section 65b extends radially outward from the radially outward end of the first liquid collection section 65a. The first discharge groove section 65b opens radially outward on the outer surface 60c of the first plate 6. The fluid O that enters from the first flow path section 61 between the first surface 60a and the first end surface 24e of the rotor core 24 and flows radially outward flows into the first liquid collection section 65a of the first recess 65 and is discharged radially outward from the first discharge groove section 65b of the first plate 6.

[0077] The third recess 66 is provided on the first surface 60a. In this embodiment, the first plate 6 is provided with eight third recesses 66. The third recess 66 is located radially inward of the through hole 63. The third recess 66 is located between two first flow channel portions 61 that are adjacent to each other in the circumferential direction.

[0078] The third recess 66 has a third liquid collection section 66a and a third discharge groove section 66b. In this embodiment, the third liquid collection section 66a is substantially pentagonal in shape when viewed from the axial direction. The third discharge groove section 66b extends radially outward from the third liquid collection section 66a. The third discharge groove section 66b also opens radially outward on the inner surface of the through hole 63. The fluid O leaking from the first flow path section 61 flows into the third liquid collection section 66a of the third recess 66 and is discharged from the third discharge groove section 66b to the through hole 63.

[0079] As shown in Figure 6, a first contact surface 60p is provided on the first surface 60a of the first plate 6. The first contact surface 60p contacts the first end surface 24e of the rotor core 24 when the first plate 6 is pressed against the rotor core 24 by the fixing part 5. In this embodiment, the first contact surface 60p is provided over the entire first surface 60a. However, the first contact surface 60p may be a part of the first surface 60a.

[0080] In this embodiment, the first contact surface 60p is a flat surface that extends along a direction perpendicular to the central axis J1, both in the fixed state and in the component state. However, if the first contact surface 60p undergoes elastic deformation in the fixed state and becomes a flat surface along the first end face 24e, then the first contact surface 60p in the component state may be, for example, a conical surface centered on the central axis J1. That is, the first contact surface 60p in the component state may be inclined with respect to a plane perpendicular to the central axis J1.

[0081] In this embodiment, the first contact surface 60p extends radially outward from the edge of the first shaft insertion hole 60h. The radial position of the inner edge of the first contact surface 60p in this embodiment is the same as the radial position of the inner end 61a of the first flow channel 61. According to this embodiment, the first contact surface 60p and the inner end 61a of the first flow channel 61 can be stably brought into contact, and the outflow of fluid O from the inner end 61a can be suppressed.

[0082] A first base portion 68 is provided on the second surface 60b, which protrudes in the axial direction. That is, the first base portion 68 protrudes from the second surface 60b of the first main body portion 60 in one axial direction (+Y). The first base portion 68 extends in a substantially annular shape along the inner edge of the first shaft insertion hole 60h.

[0083] The first base portion 68 has a first support surface 68f that contacts the fixed portion 5 in the axial direction. That is, the first plate 6 has a first support surface 68f. The first support surface 68f faces one side (+Y) in the axial direction. The first support surface 68f extends along a direction perpendicular to the axial direction. Also, the first support surface 68f extends radially outward from the edge of the first shaft insertion hole 60h. The first support surface 68f is an annular flat surface centered on the central axis J1. Note that the shape of the first support surface 68f is not limited to this embodiment.

[0084] In this embodiment, the first plate 6 receives an axial force from the fixed portion 5 at the first support surface 68f. In this embodiment, the outer edge 68fa of the first support surface 68f is located radially inward from the outer edge 60pa of the first contact surface 60p. Also, the outer edge 68fa of the first support surface 68f is located radially outward from the inner end portion 61a of the first flow channel portion 61. Therefore, in the fixed state, the surface pressure received by the first surface 60a of the first plate 6 from the first end surface 24e of the rotor core 24 tends to be higher around the inner end portion 61a of the first flow channel portion 61 than near the outer edge 60pa of the first contact surface 60p. This suppresses leakage of fluid O from the gap between the first plate 6 and the rotor core 24 around the inner end portion 61a. Note that the outer edge 68fa of the first support surface 68f may be located radially outward from the outer edge 60pa of the first contact surface 60p.

[0085] The first rib 69 protrudes from the second surface 60b of the first main body portion 60 in one axial direction (+Y). That is, the second surface 60b is provided with the first rib 69 that protrudes in the axial direction. In this embodiment, the first rib 69 extends circumferentially with respect to the central axis J1. The first rib 69 is substantially annular with respect to the central axis J1. By providing the first rib 69, the first main body portion 60 can be reinforced and the rigidity of the first plate 6 can be increased.

[0086] The first rib 69 can be used, for example, as a cutting allowance for balancing the first plate 6. That is, if the rotor 20 is unbalanced after assembly, the balance of the rotor 20 can be corrected by machining a portion of the first rib 69 in the circumferential direction. A cutting method for the first rib 69 is, for example, to drill the radially outward-facing surface of the first rib 69, but this is not particularly limited. Alternatively, instead of machining a portion of the first rib 69, a weight-like component may be attached to correct the unbalance.

[0087] As shown in Figure 7, the second plate 7 has a second main body portion (main body portion) 70, a second rib (rib) 79, and a second base portion 78.

[0088] The second main body portion 70 is plate-shaped and extends perpendicular to the axial direction. When viewed from the axial direction, the second main body portion 70 is approximately circular with the central axis J1 as its center. In other words, the second main body portion 70 is approximately disc-shaped.

[0089] The second main body portion 70 has a first surface 70a facing the rotor core 24, a second surface 70b facing the opposite side of the first surface 70a in the axial direction, and an outer surface 70c facing radially outward. That is, the second plate 7 has a first surface 70a, a second surface 70b, and an outer surface 70c. The first surface 70a faces the second end surface 24f of the rotor core 24 and at least a portion of it is in contact with it.

[0090] Figure 9 shows the rear view of the second plate 7 as seen from the first surface 70a side. The second main body portion 70 is provided with a second shaft insertion hole 70h, a plurality of second flow channels 72, and a plurality of second recesses 75. That is, the second plate 7 has a second shaft insertion hole 70h, a plurality of second flow channels 72, and a plurality of second recesses 75. The second shaft insertion hole 70h penetrates the second plate 7 in the axial direction. The plurality of second flow channels 72 and the plurality of second recesses 75 are provided on the first surface 70a and are recesses that are recessed in the other axial direction (-Y) relative to the first surface 70a.

[0091] Viewed from the axial direction, the second shaft insertion hole 70h is approximately circular with the central axis J1 at its center. The shaft 21 is inserted into the second shaft insertion hole 70h. The inner diameter of the second shaft insertion hole 70h is larger than the outer diameter of the shaft 21. Multiple (two in this embodiment) protrusions 70g are provided on the inner surface of the second shaft insertion hole 70h, projecting radially inward. The two protrusions 70g are positioned on opposite sides of the central axis J1. The protrusions 70g are inserted into grooves (not shown) provided on the outer circumferential surface of the shaft 21. This positions the second plate 7 circumferentially with respect to the shaft 21.

[0092] The second flow channel 72 is provided on the first surface 70a. In this embodiment, the second flow channel 72 is a groove that extends to one side in the circumferential direction as it moves radially outward. When the second plate 7 is attached to the rotor core 24, the portion of the second flow channel 72 that opens in the axial direction is covered by the second end face 24f of the rotor core 24 (see Figure 1). In this embodiment, the second plate 7 is provided with eight second flow channel sections 72. In this embodiment, the multiple second flow channel sections 72 are arranged at equal intervals in the circumferential direction.

[0093] The second flow channel section 72 has an inner end (first end) 72a, an outer end (second end) 72b located on one side in the circumferential direction and radially outward from the inner end 72a, and a flow channel section body 72c connecting the inner end 72a and the outer end 72b. In this embodiment, the flow channel section body 72c extends linearly between the inner end 72a and the outer end 72b. However, the flow channel section body 72c may be curved, for example.

[0094] In this embodiment, the width dimension of the flow channel body 72c narrows as it moves from the inner end 72a to the outer end 72b. The width dimension of the inner end 72a is larger than the width dimension of the outer end 72b. In this specification, the width direction of the second flow channel 72 refers to the direction perpendicular to both the axial direction and the direction in which the second flow channel 72 extends.

[0095] The inner end 72a overlaps with the entirety of the first hole 24a when viewed from the axial direction. That is, the inner end 72a is connected to the first hole 24a. Note that the inner end 72a only needs to overlap with at least a portion of the first hole 24a when viewed from the axial direction. Also, at least a portion of the outer end 72b overlaps with the second hole 24b when viewed from the axial direction. That is, the outer end 72b is connected to the second hole 24b. Furthermore, the second flow channel 72 connects the first hole 24a and the second hole 24b.

[0096] The second recess 75 is provided on the first surface 70a. In this embodiment, the second plate 7 is provided with eight second recesses 75. The second recesses 75 are located radially outward from the second flow channel 72.

[0097] The second recess 75 has a second liquid collection section 75a and a second discharge groove section 75b. The second liquid collection section 75a extends circumferentially when viewed from the axial direction. The radially outer edge of the second liquid collection section 75a extends in an arc along the outer surface 70c of the second main body section 70. The radially inner edge of the second liquid collection section 75a extends linearly along the second flow path section 72. The second discharge groove section 75b extends radially outward from approximately the circumferential center of the second liquid collection section 75a. The second discharge groove section 75b opens radially outward on the outer surface 70c of the second plate 7. After the fluid O leaks out from the second flow path section 72, it flows radially outward by centrifugal force into the second liquid collection section 75a and is discharged radially outward from the second discharge groove section 75b to the second plate 7.

[0098] As shown in Figure 7, the first surface 70a of the second plate 7 is provided with a second contact surface 70p and an outer opposing surface 70q.

[0099] The second contact surface 70p in this embodiment is an annular surface that extends radially outward from the inner edge of the first surface 70a. The second contact surface 70p contacts the second end surface 24f of the rotor core 24 when the second plate 7 is pressed against the rotor core 24 by the fixing part 5. The outer opposing surface 70q is located radially outward from the second contact surface 70p. The outer opposing surface 70q in this embodiment is an annular surface that extends radially inward from the outer edge of the first surface 70a.

[0100] The second contact surface 70p and the outer opposing surface 70q are arranged radially, with the boundary portion 70r in between. Therefore, the boundary portion 70r is both the outer edge 70pa of the second contact surface 70p and the inner edge of the outer opposing surface 70q. As shown in Figure 9, the boundary portion 70r extends in a substantially annular shape with the central axis J1 as the center. Note that the first surface 70a of the second plate 7 may be provided with only the second contact surface 70p, similar to the first surface 60a of the first plate 6.

[0101] As shown in Figure 7, in the component state shown in Figure 9, the second contact surface 70p of this embodiment tilts toward the rotor core 24 as it moves away from the central axis J1 (to one axial side (+Y)). That is, the second contact surface 70p is a conical surface centered on the central axis J1. The fixed second plate 7 is pressed toward the rotor core 24 side (to one axial side (+Y)) by the fixing part 5 and undergoes elastic deformation. For example, in the fixed state, the second contact surface 70p elastically deforms to become a flat surface perpendicular to the central axis J1 and makes surface contact with the second end surface 24f of the rotor core 24.

[0102] The outer opposing surface 70q is inclined away from the rotor core 24 (towards the other axial direction (-Y)) as it moves away from the central axis J1. That is, the second contact surface 70p is a conical surface inclined in the opposite direction to the second contact surface 70p. The outer opposing surface 70q, for example in a fixed state, faces the second end surface 24f of the rotor core 24 with a small gap between them.

[0103] As shown in Figure 7, on the first surface 70a of the second plate 7 in this embodiment, an outer opposing surface 70q is provided radially outward of the second contact surface 70p, inclined in the opposite direction to the second contact surface 70p. Therefore, on the first surface 70a, the boundary portion 70r between the second contact surface 70p and the outer opposing surface 70q is located furthest to the axial side (+Y). During the assembly process of the rotor 20, when the second plate 7 is pressed by the fixing part 5, first the boundary portion 70r of the second plate 7 contacts the second end surface 24f of the rotor core 24. Then the second plate 7 gradually elastically deforms and the second contact surface 70p comes into contact. The surface pressure received by the second contact surface 70p from the second end surface 24f of the rotor core 24 is greatest at the outer edge 70pa and gradually decreases as it moves radially inward from the outer edge 70pa.

[0104] As shown in Figure 9, the outer edge 70pa of the second contact surface 70p in this embodiment is located radially outward from the second flow channel 72. Furthermore, the outer edge 70pa of the second contact surface 70p is located radially outward from the opening on the other axial side (-Y) of the first hole 24a and the opening on the other axial side (-Y) of the second hole 24b. As described above, the second contact surface 70p tilts toward the rotor core 24 (to one axial side (+Y)) as it moves away from the central axis J1. For this reason, the surface pressure is most likely to be highest near the outer edge 70pa of the second contact surface 70p in the second plate 7. According to this embodiment, by positioning the outer edge 70pa of the second contact surface 70p radially outward from the openings on the other axial side (-Y) of the first hole 24a and the second hole 24b, the surface pressure between the first surface 70a of the second plate 7 and the second end surface 24f of the rotor core 24 can be increased radially outward from the openings of the first hole 24a and the second hole 24b. This prevents the fluid O flowing through the first hole 24a, the second hole 24b, and the second flow channel 72 from flowing out radially outward from the second plate 7 between the second plate 7 and the rotor core 24.

[0105] As shown in Figure 7, the second surface 70b is provided with a second base portion 78 that protrudes in the axial direction. That is, the second base portion 78 protrudes from the second surface 70b of the second main body portion 70 in the other axial direction (-Y). In this embodiment, the second base portion 78 extends in an annular shape along the inner edge of the second shaft insertion hole 70h.

[0106] The second base portion 78 has a second support surface 78f that contacts the fixed portion 5 in the axial direction. That is, the second plate 7 has a second support surface 78f. The second support surface 78f faces the other axial direction (-Y). The second support surface 78f extends along a direction perpendicular to the axial direction. Also, the second support surface 78f extends radially outward from the edge of the second shaft insertion hole 70h. The second support surface 78f is an annular flat surface centered on the central axis J1. Note that the shape of the second support surface 78f is not limited to this embodiment.

[0107] In this embodiment, the second plate 7 receives an axial force from the fixing part 5 at the second support surface 78f. The outer edge 78fa of the second support surface 78f is located radially inward from the outer edge 70pa of the second contact surface 70p. Therefore, when the fixing part 5 presses the second plate 7 towards the rotor core 24, the region radially inward from the outer edge 70pa of the second plate 7 undergoes elastic deformation so that it bends axially in one direction (+Y). This allows the entire second contact surface 70p to contact the rotor core 24, making the surface pressure received by the second contact surface 70p from the second end face 24f of the rotor core 24 more uniform and suppressing leakage of fluid O from the second flow channel 72.

[0108] The second rib 79 protrudes from the second surface 70b of the second main body 70 in the other axial direction (-Y). That is, the second surface 70b is provided with a second rib 79 that protrudes in the axial direction. The second rib 79 extends circumferentially around the central axis J1. The second rib 79 is substantially annular around the central axis J1. Similar to the first rib 69, the second rib 79 reinforces the second main body 70 and increases the rigidity of the second plate 7. Also, similar to the first rib 69, the second rib 79 can be used as a machining allowance for balancing the second plate 7.

[0109] <Rotor flow path> As shown in Figure 1, the rotor 20 is provided with a rotor flow path 29. The rotor flow path 29 has a hollow section 21a, a shaft hole section 21b, a first flow path section 61, a first hole section 24a, a second flow path section 72, a second hole section 24b, and a through hole 63. The rotor flow path 29 is a path for fluid O composed of the hollow section 21a, the shaft hole section 21b, the first flow path section 61, the first hole section 24a, the second flow path section 72, the second hole section 24b, and the through hole 63. In this embodiment, the rotor flow path 29 is configured by connecting the hollow section 21a, the shaft hole section 21b, the first flow path section 61, the first hole section 24a, the second flow path section 72, the second hole section 24b, and the through hole 63 in this order.

[0110] As shown in Figure 1, the rotor channel 29 is provided with one hollow section 21a. Furthermore, as shown in Figures 3, 8, and 9, the rotor channel 29 is provided with eight shaft holes 21b, eight first channel sections 61, eight first holes 24a, eight second channel sections 72, eight second holes 24b, and eight through holes 63. In other words, the rotor channel 29 branches into eight paths when the fluid flows from the hollow section 21a to the shaft hole section 21b.

[0111] As shown in Figure 1, fluid O is supplied to the hollow section 21a from the flow path 9. The fluid O supplied to the hollow section 21a flows radially outward through the shaft hole 21b due to centrifugal force. The radially outer end of the shaft hole 21b is connected to the radially inner end of the first flow path 61 (the inner end 61a shown in Figure 8), so the fluid O in the shaft hole 21b flows into the first flow path 61. The first flow path 61 extends radially. The radially outer end of the first flow path 61 (the outer end 61b shown in Figure 8) is connected to the axial end (+Y) of the first hole 24a. Centrifugal force is applied to the fluid O inside the first flow path 61, and it flows into the first hole 24a. The axial end (-Y) of the first hole 24a is connected to the radially inner end of the second flow path 72 (the inner end 72a shown in Figure 9). The fluid O in the first hole 24a flows axially to the other side (-Y) and flows into the second flow channel 72. The second flow channel 72 extends radially. The radially outer end of the second flow channel 72 (outer end 72b shown in Figure 9) is connected to the axially opposite (-Y) end of the second hole 24b. Centrifugal force is applied to the fluid O inside the second flow channel 72, and it flows into the second hole 24b. The axially opposite (+Y) end of the second hole 24b is connected to the through hole 63. The fluid O in the second hole 24b flows axially to the other side (+Y), passes through the through hole 63, and flows out from the rotor 20.

[0112] In this embodiment, the fluid O flowing through the rotor channel 29 is cooled by the cooler 8B. The fluid O absorbs heat from the rotor core 24 at the first hole 24a and the second hole 24b, thereby cooling the rotor core 24. As a result, the fluid O can cool the rotor core 24 and the magnet 25 (see Figure 3) held by the rotor core 24.

[0113] The first flow channel 61 may be provided on at least one of the opposing surfaces of the first plate 6 and the rotor core 24. For example, the first flow channel 61 may be a groove provided on the first end face 24e of the rotor core 24 and covered by the first plate 6. Similarly, the second flow channel 72 may be provided on at least one of the opposing surfaces of the second plate 7 and the rotor core 24. For example, the second flow channel 72 may be a groove provided on the second end face 24f of the rotor core 24 and covered by the second plate 7.

[0114] In this embodiment, it is preferable that the first flow channel 61 is provided on one of the plates (first plate 6) of the first plate 6 and the second plate 7, which is farther from the opening of the hollow portion 21a and closer to the bottom 21aa of the hollow portion 21aa. The fluid O flows through the inside of the hollow portion 21a in one axial direction (+Y) from the opening of the hollow portion 21a towards the bottom 21aa. Therefore, the fluid O inside the hollow portion 21a tends to accumulate near the bottom 21aa. According to this embodiment, by providing the first flow channel 61 on the first plate 6 closer to the bottom 21aa, the fluid O accumulating near the bottom 21aa can be guided to the first flow channel 61 by the shaft hole 21b. This makes it easier to secure the flow rate of the fluid O guided to the first flow channel 81. Note that the arrangement of the first flow channel 61 relative to the bottom 21aa is not limited to this embodiment. In other words, the first flow channel 61 may be provided on the plate (second plate 7) that is close to the opening of the hollow portion 21a and far from the bottom 21aa of the hollow portion 21a, among the first plate 6 and the second plate 7.

[0115] As shown in Figures 6 and 7, according to the rotor 20 of this embodiment, when the first plate 6 and the second plate 7 are not pressed against the rotor core 24 by the fixing part 5 (part state), the second contact surface 70p of the second plate 7 is inclined in a direction that approaches the rotor core 24 as it moves away from the central axis J1. According to this embodiment, by making the second contact surface 70p an inclined surface as described above, in the fixed state, the surface pressure that the first surface 70a of the second plate 7 receives from the second end surface 24f of the rotor core 24 can be increased near the outer edge 70pa of the second contact surface 70p. For this reason, by positioning the opening on the other axial side (-Y) of the first hole 24a radially inward from the outer edge 70pa of the second contact surface 70p, it is possible to suppress the outflow of fluid O from the first hole 24a to the radially outward side of the second plate 7.

[0116] Furthermore, in the first plate 6 and second plate 7 in their component state, the angle θ2 between the plane perpendicular to the central axis J1 and the second contact surface 70p is greater than the angle θ1 between the plane perpendicular to the central axis J1 and the first contact surface 60p (θ2 > θ1). Here, the angle between the plane perpendicular to the central axis J1 and the first contact surface 60p is defined as the first angle θ1, and the angle between the plane perpendicular to the central axis J1 and the second contact surface 70p is defined as the second angle θ2. In this embodiment, the first contact surface 60p is a flat surface perpendicular to the central axis J1. Therefore, the angle of the first angle θ1 is 0°. On the other hand, in this embodiment, the second contact surface 70p is inclined in a direction that approaches the rotor core 24 as it moves away from the central axis J1. Therefore, the angle of the second angle θ2 is greater than 0°.

[0117] In this embodiment, the first angle θ1 of the first contact surface 60p is smaller than the second angle θ2 of the second contact surface 70p (θ2 > θ1). Therefore, in the fixed state, the distribution of surface pressure received by the first surface 60a of the first plate 6 from the first end surface 24e of the rotor core 24 and the distribution of surface pressure received by the first surface 70a of the second plate 7 from the second end surface 24f of the rotor core 24 are different from each other. More specifically, the surface pressure received by the first surface 60a of the first plate 6 tends to be higher in the radially inward region compared to the surface pressure received by the first surface 70a of the second plate 7. As a result, it is easier to increase the surface pressure received by the first surface 70a from the first end surface 24e of the rotor core 24 around the connection portion between the shaft hole 21b located on the inner edge of the first surface 60a and the first flow path 61, making it easier to suppress fluid leakage from the connection portion.

[0118] In this embodiment, as shown in Figure 7, the second contact surface 70p of this embodiment extends linearly in a cross-section passing through the central axis J1. However, the second contact surface 70p may be a curved surface extending radially and axially while changing its curvature. Also, if the first angle θ1 shown in Figure 6 is smaller than the second angle θ2 shown in Figure 7, the first contact surface 60p may be inclined with respect to a plane perpendicular to the central axis J1. In this case, the direction of inclination of the first contact surface 60p may be the same as the direction of inclination of the second contact surface 70p, or it may be on the opposite side. Also, in this case, the first contact surface 60p may be a curved surface extending radially and axially while changing its curvature.

[0119] In this embodiment, the first contact surface 60p is a flat surface that extends along a direction perpendicular to the central axis J1 in the first plate 6 in its component state. According to this embodiment, the fixing part 5 can apply substantially uniform surface pressure to the portion of the first contact surface 60p of the first plate 6 that overlaps axially with the first support surface 68f when fixed. This makes it easier to apply uniform surface pressure around the first flow channel portion 61 of the first contact surface 60p, and makes it easier to suppress leakage of fluid O from the first flow channel portion 61. Furthermore, according to this embodiment, the surface pressure received by the first surface 60a of the first plate 6 from the first end surface 24e of the rotor core 24 can be made more uniform across the entire first surface 60a. Therefore, it is possible to suppress leakage of fluid O from the second hole portion 24b between the first surface 60a and the first end surface 24e.

[0120] In this embodiment, the first surface 70a of the second plate 7 is provided with a second contact surface 70p and an outer opposing surface 70q located radially outside the second contact surface 70p. The outer opposing surface 70q is inclined away from the rotor core 24 as it moves away from the central axis J1. Therefore, in a fixed state, even if surface pressure is applied from the second end surface 24f of the rotor core 24 to the second contact surface 70p, surface pressure is less likely to be applied to the outer opposing surface 70q. According to this embodiment, by providing the outer opposing surface 70q radially outside the second contact surface 70p, the area of ​​the second contact surface 70p that contacts the second end surface 24f of the rotor core 24 can be reduced. As a result, the surface pressure applied from the second end surface 24f to the second contact surface 70p can be increased, and leakage of fluid O from between the second contact surface 70p and the rotor core 24 can be suppressed.

[0121] In this embodiment, the outer opposing surface 70q is provided only on the second plate 7, but the first plate 6 may also be provided with a similar outer opposing surface located radially outward of the first contact surface 60p. In this case as well, the area of ​​the first contact surface 60p that contacts the first end surface 24e of the rotor core 24 can be reduced, and the surface pressure of the first contact surface 60p can be increased. That is, at least one of the first surfaces 60a, 70a of the first plate 6 and the second plate 7 should be provided with either the first contact surface 60p or the second contact surface 70p, and an outer opposing surface located radially outward of the contact surface.

[0122] As shown in Figure 7, the outer opposing surface 70q in this embodiment extends linearly in a cross-section passing through the central axis J1. However, the outer opposing surface 70q may be a curved surface that extends radially and axially while changing curvature. Furthermore, the outer opposing surface 70q may have a stepped shape so as to be located on the other axial side (-Y) relative to the second contact surface 70p.

[0123] In the second plate 7 of this embodiment, the radial dimension d1 of the second contact surface 70p is larger than the radial dimension d2 of the outer opposing surface 70q. According to this embodiment, it is easier to position the outer edge 70pa of the second contact surface 70p radially outward. This makes it easier to position the second flow channel 72, the first hole 24a, and the second hole 24b radially inward from the outer edge 70pa of the second contact surface 70p, and makes it easier to suppress leakage of fluid O from the second flow channel 72, the first hole 24a, and the second hole 24b. Furthermore, the first hole 24a and the second hole 24b can be positioned radially inward from the outer edge 70pa of the second contact surface 70p, while also being closer to the magnet 25 provided radially outward. This makes it easier to cool the magnet 25 with the fluid O flowing through the first hole 24a and the second hole 24b.

[0124] Furthermore, even when the first plate 6 shown in Figure 6 is provided with an outer opposing surface, it is preferable, similar to this embodiment, that the radial dimension of the first contact surface 60p is larger than the radial dimension of the outer opposing surface. In this case as well, it becomes easier to position the outer edge 60pa of the first contact surface 60p radially outward from the first flow channel 61 and the first hole 24a, making it easier to suppress fluid O leakage from the first flow channel 61 and the first hole 24a.

[0125] As shown in Figure 7, in the second plate 7 of this embodiment, the second rib 79 axially overlaps with the boundary portion 70r between the second contact surface 70p and the outer opposing surface 70q. According to this embodiment, the second rib 79 can reinforce the boundary portion 70r between the second contact surface 70p and the outer opposing surface 70q from the opposite side of the second contact surface 70p (i.e., the second surface 70b). The boundary portion 70r between the second contact surface 70p and the outer opposing surface 70q is located on the axial side (+Y) on the first surface 70a of the second plate 7. Therefore, in a fixed state, surface pressure applied from the rotor core 24 to the first surface 70a of the second plate 7 tends to concentrate at the boundary portion 70r. According to this embodiment, by reinforcing the boundary portion 70r with the second rib 79, damage to the second plate 7 in a fixed state can be suppressed.

[0126] Furthermore, even when the first plate 6 in Figure 6 is provided with an outer opposing surface, it is preferable, as in this embodiment, that the first rib 69 overlaps axially with the boundary portion between the first contact surface 60p and the outer opposing surface. In this case as well, by reinforcing the boundary portion with the first rib 69, damage to the first plate 6 in the fixed state can be suppressed. That is, at least one of the first plate 6 and the second plate 7 only needs to have a first surface 70a on which the contact surface (second contact surface 70p in this embodiment) and the outer opposing surface 70q are provided, and a second surface 70b on which the second rib 79 that overlaps axially with the boundary portion 70r is provided.

[0127] As shown in Figure 9, in the second plate 7 of this embodiment, the second flow channel 72 is located radially inward from the radially outer edge 70pa of the second contact surface 70p. According to this embodiment, the surface pressure applied to the first surface 70a of the second plate 7 can be increased near the second flow channel 72. This makes it possible to suppress the leakage of fluid O from the second flow channel 72 between the second plate 7 and the rotor core 24.

[0128] As shown in Figure 8, in the first plate 6 of this embodiment, the first flow channel 61 is located radially inward from the radially outer edge 60pa of the first contact surface 60p. According to this embodiment, the surface pressure applied to the first surface 60a of the first plate 6 can be increased near the first flow channel 61. This makes it possible to suppress the leakage of fluid O from the first flow channel 61 between the first plate 6 and the rotor core 24.

[0129] Furthermore, according to this embodiment, the opening on one axial side (+Y) of the second hole 24b is located radially inward from the radially outer edge 60pa of the first contact surface 60p. According to this embodiment, the surface pressure of the first surface 60a of the first plate 6 can be increased near the opening of the second hole 24b. This prevents the fluid O from the second hole 24b from leaking out between the first surface 60a and the first end surface 24e.

[0130] As shown in Figure 3, in the rotor core 24 of this embodiment, at least a portion of the first hole 24a is located radially outward from the radially inward end of the magnet hole 24h. In an inner rotor type motor, the magnets 25 of the rotor 20 are sometimes positioned biased towards the radially outward side (i.e., towards the stator 30 side in the radial direction). According to this embodiment, the first hole 24a through which the fluid O flows can be positioned closer to the magnets 25 in the radial direction, making it easier to cool the magnets 25 with the fluid O flowing through the first hole 24a.

[0131] In this embodiment, the first hole 24a is positioned on the second virtual line Lq when viewed from the axial direction. That is, the first hole 24a is located on the q-axis. According to this embodiment, the first hole 24a is less likely to obstruct the magnetic path formed in the rotor core 24, and the reduction in torque of the rotor core 24 can be suppressed.

[0132] In this embodiment, the second hole 24b is located between adjacent first magnet holes 24p in the circumferential direction. According to this embodiment, the second hole 24b can be positioned closer to the first magnet 25p housed in the first magnet hole 24p, making it easier to cool the first magnet 25p with the fluid O flowing through the second hole 24b.

[0133] In this embodiment, the second hole 24b is located radially between the first magnet hole 24p and the second magnet hole 24q. According to this embodiment, the second hole 24b can be positioned closer to the first magnet 25p housed in the first magnet hole 24p and the second magnet 25q housed in the second magnet hole 24q. This makes it easier to cool the first magnet 25p and the second magnet 25q with the fluid O flowing through the second hole 24b.

[0134] In this embodiment, the first magnet 25p is located between the first hole 24a and the second hole 24b when viewed from the axial direction. Since fluid O flows through the first hole 24a and the second hole 24b, the first magnet 25p can be efficiently cooled by placing it between the first hole 24a and the second hole 24b. In particular, in this embodiment, the first magnet 25p is sandwiched between the first hole 24a and the second hole 24b in the thickness direction of the first magnet 25p. Therefore, the first magnet 25p can be cooled from multiple directions. In addition, the thickness direction of the first magnet 25p in this embodiment coincides with the magnetization direction. According to this embodiment, the first hole 24a and the second hole 24b can efficiently cool both sides of the first magnet 25p in the thickness direction.

[0135] As shown in Figure 1, in the rotor 20 of this embodiment, the second flow channel 72 connects the first hole 24a and the second hole 24b. The second flow channel 72 of this embodiment can guide the fluid O flowing in the other axial direction (-Y) through the first hole 24a to the second hole 24b. As a result, the fluid O flowing through the rotor flow channel 29 flows in the other axial direction (-Y) through the first hole 24a, turns back at the second flow channel 72, and flows in the one axial direction (+Y) through the second hole 24b. According to this embodiment, the rotor flow channel 29 can be made longer, and the rotor core 24 can be cooled efficiently.

[0136] Furthermore, in this embodiment, the fluid O is supplied from the pump 8A. When the amount of fluid O supplied from the pump 8A is the same, by using a structure in which one flow path folds back, as in this embodiment, it becomes easier to increase the flow rate of fluid O flowing through the flow path in the rotor core 24 compared to the case where two flow paths that do not fold back (for example, a structure that penetrates in the axial direction) are provided, and the rotor 20 can be cooled efficiently. In addition, since there is no need to excessively increase the amount of fluid O supplied from the pump 8A, it is possible to suppress an increase in the amount of fluid O in the shaft 21, which would increase the rotational resistance of the rotor 20 and increase the overall weight of the rotor 20.

[0137] In this embodiment, all (eight) flow paths branching from the hollow portion 21a of the shaft 21 are guided into the interior of the rotor core 24 by the first plate 6, and then reversed at the second plate 7 and guided back into the interior of the rotor core 24. However, some of the multiple flow paths branching from the hollow portion 21a of the shaft 21 (for example, four of the eight) may be guided into the interior of the rotor core 24 by the second plate 7, and then reversed at the first plate 6 and guided back into the interior of the rotor core 24.

[0138] As shown in Figure 9, in this embodiment, the second hole 24b is radially outward from the first hole 24a and is located on one side of the first hole 24a in the circumferential direction. The second flow path 72 extends to one side in the circumferential direction as it moves radially outward. When the rotor 20 rotates, centrifugal force is applied and the fluid O in the second flow path 72 flows radially outward. Therefore, according to this embodiment, by providing the second hole 24b radially outward from the first hole 24a, the fluid O can be smoothly guided from the first hole 24a to the second hole 24b. Furthermore, because the second hole 24b is located on one side in the circumferential direction from the first hole 24a, when the rotor 20 rotates to the other side in the circumferential direction, the inertial force can be used to smoothly guide the fluid O in the second flow path 72 from the first hole 24a to the second hole 24b.

[0139] In this embodiment, the second flow channel 72 has an inner end 72a connected to the first hole 24a, an outer end 72b connected to the second hole 24b, and a flow channel body 72c whose widthwise dimension narrows as it moves from the inner end 72a to the outer end 72b. In the widthwise direction of the second flow channel 72, the dimension of the inner end 72a is larger than the dimension of the opening on the other axial side (-Y) of the first hole 24a. Therefore, fluid O can be smoothly guided from the opening of the first hole 24a to the inner end 72a of the second flow channel 72. Also, in the widthwise direction of the second flow channel 72, the dimension of the outer end 72b is smaller than the dimension of the opening on the other axial side of the second hole 24b. Therefore, fluid O can be smoothly guided from the outer end 72b of the second flow channel 72 to the opening of the second hole 24b.

[0140] As shown in Figure 8, the first surface 60a of the first plate 6 in this embodiment is provided with a first recess 65 located radially outside the first flow channel 61. The first recess 65 opens at the radially outside end of the first plate 6. According to this embodiment, the fluid O leaking from the first flow channel 61 between the first plate 6 and the rotor core 24 can be collected in the first recess 65 and discharged radially outside the first plate 6. Also, as shown in Figure 9, the first surface 70a of the second plate 7 is provided with a second recess 75 located radially outside the second flow channel 72. The second recess 75 opens at the radially outside end of the second plate 7. According to this embodiment, the fluid O leaking from the second flow channel 72 between the second plate 7 and the rotor core 24 can be collected in the second recess 75 and discharged radially outside the second plate 7. According to this embodiment, the deterioration of the rotor 20's balance during rotation due to the retention of fluid O between the first plate 6 and the rotor core 24, and between the second plate 7 and the rotor core 24, can be suppressed. Furthermore, according to this embodiment, the first plate 6 and the second plate 7 can be made lighter by providing a first recess 65 in the first plate 6 and a second recess 75 in the second plate 7.

[0141] As shown in Figure 9, in this embodiment, the second recess 75 of the second plate 7 overlaps the first magnet hole 24p in the axial direction. Therefore, when fluid O flows into the first magnet hole 24p, the fluid O can be discharged to the outside of the rotor 20 through the opening of the second recess 75. This prevents the deterioration of the rotor 20's balance during rotation due to fluid O remaining inside the first magnet 25p.

[0142] In this embodiment, the case in which the second recess 75 overlaps with the first magnet hole 24p has been described. However, the magnet hole 24h that the second recess 75 overlaps with may be the second magnet hole 24q. Also, the first recess 65 may overlap with one or both of the first magnet hole 24p and the second magnet hole 24q. In other words, it is sufficient that at least one of the first recess 65 and the second recess 75 overlaps axially with at least one of the multiple magnet holes 24h.

[0143] As shown in Figure 5, in the rotor 20 of this embodiment, the magnet hole 24h houses a magnet 25 and a resin part 26 that fixes the magnet 25 to the inner surface of the magnet hole 24h. The surfaces of the magnet 25 and the resin part 26 facing the other axial side (-Y) come into contact with the slide part 93 during the molding process of the resin part 26. Therefore, the surfaces of the magnet 25 and the resin part 26 facing the other axial side (-Y) may be located one axial side (+Y) of the second end face 24f of the rotor core 24. In this case, the rotor 20 is provided with a recess 20a that is recessed relative to the second end face 24f of the rotor core 24. Furthermore, fluid O may accumulate in this recess 20a. According to this embodiment, the second recess 75 of the second plate 7 attached to the second end face 24f of the rotor core 24 overlaps with the magnet hole 24h. Therefore, the fluid O that accumulates in the recess 20a of the rotor core 24 can be discharged from the second recess 75.

[0144] <Variation> Next, we will describe modified rotors 120 and 220 that can be used in the above-described embodiment. In the description of each modified example below, components that are identical in form to those in the above-described embodiment will be denoted by the same reference numerals, and their descriptions will be omitted.

[0145] The rotors 120 and 220 of each modified example differ from those of the above-described embodiment mainly in the structure of the first flow channels 161 and 261. In addition, the structure of the rotor core 24 in the rotors 120 and 220 of each modified example is substantially the same as that of the above-described embodiment, but differs in that different through holes function as the first holes 124a and 224a.

[0146] (Variation 1) Figure 10 is a schematic diagram showing a part of the rotor 120 of Modification 1. Similar to the embodiment described above, the first flow channel 161 extends radially. The radially inner end of the first flow channel 161 is connected to the shaft hole 21b (see Figure 1).

[0147] In this modified example, the radially outer end of the first flow channel 161 is connected to the flux barrier 24hb of the first magnet hole 24p. That is, in this modified example, a portion of the magnet hole 24h functions as the first hole portion 124a. In this modified example, no resin portion is provided inside the first magnet hole 24p. However, a resin portion may be provided inside a portion of the first magnet hole 24p, and the other portion may function as the first hole portion 124a.

[0148] According to this modified example, by using the magnet hole 24h in conjunction with the first hole 124a, fluid O flows into the magnet hole 24h. According to this modified example, the magnet 25 housed in the magnet hole 24h can be directly cooled by the fluid O.

[0149] (Modification 2) Figure 11 is a schematic diagram showing a part of the rotor 220 of the modified example 2. Similar to the embodiment described above, the first flow channel 261 extends radially. The radially inner end of the first flow channel 261 is connected to the shaft hole 21b (see Figure 1).

[0150] In this modified example, the radially outer end of the first flow channel 261 connects to the second hole 24b of the rotor core 24. That is, the second hole 24b in the above embodiment functions as the first hole 224a in this modified example.

[0151] In this modified example, the first hole 224a is located on the first imaginary line Ld. That is, the first hole 224a is located on the d-axis. In this modified example, the first hole 224a is located between adjacent first magnet holes 24p in the circumferential direction. According to this modified example, the first hole 224a can be positioned closer to the first magnet 25p housed in the first magnet hole 24p, making it easier to cool the first magnet 25p with the fluid O flowing through the first hole 224a. Also, in this modified example, the first hole 224a is located between the first magnet hole 24p and the second magnet hole 24q in the radial direction. According to this modified example, the first hole 224a can be positioned closer to the first magnet 25p housed in the first magnet hole 24p and the second magnet 25q housed in the second magnet hole 24q. This makes it easier to cool the first magnet 25p and the second magnet 25q with the fluid O flowing through the first hole 224a.

[0152] In this modified example, the case in which the second hole 24b in the above embodiment is used as the first hole 224a has been described, but the third hole 24c may also be used as the first hole. That is, the radially outer end of the first flow channel may be connected to the third hole 24c.

[0153] Although various embodiments and modifications of the present invention have been described above, the configurations and combinations thereof in each embodiment and modification are merely examples, and additions, omissions, substitutions, and other changes to the configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited by its embodiments.

[0154] For example, the first and second contact surfaces do not have to be annular. Multiple first and second contact surfaces may be provided at intervals in the circumferential direction. The first and second contact surfaces may be C-shaped when viewed in the axial direction. The radial positions of the first and second contact surfaces are not particularly limited. The first and second plates may be composed of a single member or multiple members. Furthermore, the fixing part 5 does not necessarily have to be annular, as long as it can press the first or second plate against the rotor core 24.

[0155] In the above-described embodiment, a structure was described in which the rotor flow path folds back at the end of the rotor on the other axial side (-Y). However, the rotor flow path may open to the outside of the rotor in the second flow path section. In this embodiment, a through hole that penetrates the first plate 6 axially may be provided at the downstream end of the rotor flow path, and a groove that extends radially outward and opens radially outward may be provided in at least one of the first plate 6 or the rotor core.

[0156] In the embodiments described above, the arrangement of magnets within the rotor is just one example. For example, the rotor may have only one annular magnet. The rotor may not have any magnets at all.

[0157] Furthermore, this technology can be configured as follows: (1) A rotor that can rotate about a central axis, The rotor and the stator are located radially opposite each other, The rotor is A shaft extending axially with respect to the aforementioned central axis, A rotor core having a central hole through which the aforementioned shaft passes, A first plate located on one axial side of the rotor core, A second plate located on the other axial side of the rotor core, It has fixing portions located on one axial side of the first plate and on the other axial side of the second plate, The aforementioned shaft includes, A hollow section extending in the axial direction, A shaft hole is provided that extends radially outward from the hollow portion and opens on the outer circumferential surface of the shaft. The rotor core is provided with a first hole that penetrates in the axial direction. A first flow channel is provided on at least one of the opposing surfaces of the first plate and the rotor core, connecting the shaft hole and the first hole. A second flow channel connected to the first hole is provided on at least one of the opposing surfaces of the second plate and the rotor core. The first plate has a first contact surface that is pressed against the rotor core by the fixing portion and contacts the rotor core in the axial direction, The second plate has a second contact surface that is pressed against the rotor core by the fixing portion and contacts the rotor core in the axial direction, The opening on the other axial side of the first hole is located radially inward from the radially outer edge of the second contact surface. A rotating electric machine in which, when the first plate and the second plate are not pressed against the rotor core by the fixing portion, the second contact surface is inclined toward the rotor core as it moves away from the central axis, and the angle between the plane perpendicular to the central axis and the second contact surface is greater than the angle between the plane perpendicular to the central axis and the first contact surface. (2) The rotating electric machine according to (1), wherein, when the first plate is not pressed against the rotor core by the fixing portion, the first contact surface is a flat surface extending in a direction perpendicular to the central axis. (3) On at least one of the first plate and the second plate that faces the rotor core, The contact surface of either the first contact surface or the second contact surface, The rotating electric machine according to (1) or (2), wherein an outer opposing surface is provided, which is located radially outward from the contact surface and is inclined away from the rotor core as it moves away from the central axis. (4) The rotating electric machine according to (3), wherein the radial dimension of the contact surface is greater than the radial dimension of the outer opposing surface. (5) At least one of the first plate and the second plate is A first surface facing the rotor core, on which the contact surface and the outer opposing surface are provided, It has a second surface facing the opposite side of the first surface in the axial direction, The second surface is provided with ribs that protrude in the axial direction. The rotating electric machine according to (3) or (4), wherein the rib overlaps in the axial direction with the boundary portion between the contact surface and the outer opposing surface. (6) The rotating electric machine according to any one of (1) to (5), wherein the second flow channel is located radially inward from the radially outer edge of the second contact surface. (7) The first flow channel is located radially inward from the radially outer edge of the first contact surface, as described in any one of (1) to (6). (8) The rotor has a plurality of magnets, The rotor core is provided with a plurality of magnet holes that penetrate in the axial direction and each house one of the magnets. The rotating electric machine according to any one of (1) to (7), wherein at least a portion of the first hole is located radially outward from the radially inward end of the magnet hole. (9) The rotor core is provided with a second hole that penetrates in the axial direction, The second flow channel is a rotating electric machine according to any one of (1) to (8) that connects the first hole and the second hole. (10) The second hole is radially outward from the first hole and is located on one side of the first hole in the circumferential direction. The second flow channel extends to one side in the circumferential direction as it moves radially outward, as described in (9) for the rotating electric machine. (11) The second flow channel section is The first end portion connected to the first hole, The second end portion connected to the second hole, It has a flow channel body whose widthwise dimension narrows from the first end to the second end, In the width direction of the second flow channel, the dimension of the first end is larger than the dimension of the opening on the other axial side of the first hole. The rotating electric machine according to (9) or (10), wherein, in the width direction of the second flow channel, the dimension of the second end is smaller than the dimension of the opening on the other axial side of the second hole. (12) The rotor has a plurality of magnets, The rotor core is provided with a plurality of magnet holes that penetrate in the axial direction and house each of the magnets, The magnet is located between the first hole and the second hole when viewed from the axial direction, and is a rotating electric machine according to any one of (9) to (11). (13) A first recess is provided on the surface of the first plate facing the rotor core, A second recess is provided on the surface of the second plate facing the rotor core. The first recess is located radially outward of the first flow channel and opens at the radially outward end of the first plate. The rotating electric machine according to any one of (1) to (12), wherein the second recess is located radially outward of the second flow channel and opens at the radially outward end of the second plate. (14) The rotor has a plurality of magnets, The rotor core is provided with a plurality of magnet holes that penetrate in the axial direction and house each of the magnets, The rotating electric machine according to (13), wherein at least one of the first recess and the second recess axially overlaps with at least one of the plurality of magnet holes. (15) The rotating electric machine described in any one of items (1) to (14), A drive device comprising a power transmission unit for transmitting power to the aforementioned rotating electric machine. [Explanation of Symbols]

[0158] 1…Drive unit, 2…Rotating electric machine, 5…Fixed part, 6…First plate, 7…Second plate, 9…Flow path, 20, 120, 220…Rotor, 21…Shaft, 21a…Hollow part, 21b…Shaft hole, 24…Rotor core, 24a, 124a, 224a…First hole, 24b…Second hole, 24d…Central hole, 24h…Magnet hole, 25…Magnet, 30…Stator, 50…Power transmission part, 60a, 70a…First surface, 60b ,70b...Second surface, 60p...First contact surface, 61,161,261...First flow channel section, 65...First recess, 69...First rib (rib), 70p...Second contact surface, 70q...Outer opposing surface, 70r...Boundary section, 72...Second flow channel section, 72a...Inner end (first end), 72b...Outer end (second end), 72c...Flow channel section body, 75...Second recess, 79...Second rib (rib), d1,d2,h,H...Dimensions, J1...Center axis, θ1,θ2...Angle

Claims

1. A rotor that can rotate about its central axis, The rotor and the stator are located radially opposite each other, The rotor is A shaft extending axially with respect to the aforementioned central axis, A rotor core having a central hole through which the aforementioned shaft passes, A first plate located on one axial side of the rotor core, A second plate located on the other axial side of the rotor core, The first plate has a fixing portion located on one axial side and the second plate has a fixing portion located on the other axial side, The aforementioned shaft includes, A hollow section extending in the axial direction, A shaft hole is provided that extends radially outward from the hollow portion and opens on the outer circumferential surface of the shaft. The rotor core is provided with a first hole that penetrates in the axial direction. A first flow channel is provided on at least one of the opposing surfaces of the first plate and the rotor core, connecting the shaft hole and the first hole. A second flow channel connected to the first hole is provided on at least one of the opposing surfaces of the second plate and the rotor core. The first plate has a first contact surface that is pressed against the rotor core by the fixing portion and makes axial contact with the rotor core. The second plate has a second contact surface that is pressed against the rotor core by the fixing portion and contacts the rotor core in the axial direction, The opening on the other axial side of the first hole is located radially inward from the radially outer edge of the second contact surface. When the first plate and the second plate are not pressed against the rotor core by the fixing portion, the second contact surface is inclined toward the rotor core as it moves away from the central axis, and the angle between the plane perpendicular to the central axis and the second contact surface is greater than the angle between the plane perpendicular to the central axis and the first contact surface. Rotating electric machine.

2. When the first plate is not pressed against the rotor core by the fixing portion, The first contact surface is a flat surface that extends along a direction perpendicular to the central axis. The rotating electric machine according to claim 1.

3. On at least one of the first plate and the second plate that faces the rotor core, The contact surface of either the first contact surface or the second contact surface, An outer opposing surface is provided, which is located radially outward from the contact surface and is inclined away from the rotor core as it moves away from the central axis. The rotating electric machine according to claim 1.

4. The radial dimension of the contact surface is greater than the radial dimension of the outer opposing surface. The rotating electric machine according to claim 3.

5. At least one of the first plate and the second plate is A first surface facing the rotor core, on which the contact surface and the outer opposing surface are provided, It has a second surface facing the opposite side of the first surface in the axial direction, The second surface is provided with ribs that protrude in the axial direction. The rib overlaps in the axial direction with the boundary portion between the contact surface and the outer opposing surface. The rotating electric machine according to claim 3 or 4.

6. The second flow channel is located radially inward from the radially outer edge of the second contact surface. The rotating electric machine according to claim 1.

7. The first flow channel portion is located radially inward from the radially outer edge of the first contact surface, The rotating electric machine according to claim 1.

8. The rotor has a plurality of magnets, The rotor core is provided with a plurality of magnet holes that penetrate in the axial direction and each house one of the magnets. At least a portion of the first hole is located radially outward from the radially inward end of the magnet hole, The rotating electric machine according to claim 1.

9. The rotor core is provided with a second hole that penetrates in the axial direction. The second flow channel connects the first hole and the second hole. The rotating electric machine according to claim 1.

10. The second hole is radially outward from the first hole and is positioned on one side of the first hole in the circumferential direction. The second flow channel extends to one side in the circumferential direction as it moves radially outward. The rotating electric machine according to claim 9.

11. The second flow channel section is, The first end portion connected to the first hole, The second end portion connected to the second hole, It has a flow channel body whose widthwise dimension narrows from the first end to the second end, In the width direction of the second flow channel, the dimension of the first end is larger than the dimension of the opening on the other axial side of the first hole. In the width direction of the second flow channel, the dimension of the second end is smaller than the dimension of the opening on the other axial side of the second hole. The rotating electric machine according to claim 9.

12. The rotor has a plurality of magnets, The rotor core is provided with a plurality of magnet holes that penetrate in the axial direction and house each of the magnets, The magnet is located between the first hole and the second hole when viewed from the axial direction. A rotating electric machine according to any one of claims 9 to 11.

13. A first recess is provided on the surface of the first plate facing the rotor core. A second recess is provided on the surface of the second plate facing the rotor core. The first recess is located radially outward of the first flow channel and opens at the radially outward end of the first plate. The second recess is located radially outward of the second flow channel and opens at the radially outward end of the second plate. The rotating electric machine according to claim 1.

14. The rotor has a plurality of magnets, The rotor core is provided with a plurality of magnet holes that penetrate in the axial direction and house each of the magnets, At least one of the first recess and the second recess overlaps axially with at least one of the plurality of magnet holes, The rotating electric machine according to claim 13.

15. The rotating electric machine according to claim 1, A drive device comprising a power transmission unit for transmitting power to the aforementioned rotating electric machine.

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