JP2023050327A - Rotor, rotary electric machine and drive device - Google Patents

Abstract

To provide a rotor which facilitates manufacture by making constituent members of a rotor common and is capable of stabilizing the magnetic characteristics of the rotor, a rotary electric machine and a drive device.SOLUTION: An outer side face of a magnet 36 includes a first face 36a extending in a first direction D1 in a view from an axial direction and a second face 36b extending in a second direction D2, which is vertical to the first direction D1, in the view from the axial direction. A magnet hole 38 includes a plurality of first hole parts 38a provided along the axial direction and a second hole part which is disposed between the first hole parts 38a adjacent to each other in the axial direction and communicates with the first hole parts 38a. An inner wall of the first hole part 38a includes a first projection 38aa opposed to the first face 36a and a second projection 38ab opposed to the second face. A gap G, in which a portion of an interposing part 37 can be disposed, is provided respectively between the first projections 38aa which are arranged side by side in the axial direction and between the second projections 38ab which are arranged side by side in the axial direction.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to rotors, rotating electrical machines, and drive devices.

Conventionally, some rotors include a rotor core, magnets arranged inside slots of the rotor core, and resin filled between the inner peripheral surface of the slots and the side surfaces of the magnets (see, for example, Patent Document 1). Also known is a rotor that includes a rotor core, permanent magnets inserted into holes in the rotor core, and an adhesive sheet interposed between the holes and the permanent magnets (for example, Patent Document 2).

Japanese Patent No. 4143631 Japanese Patent Application Laid-Open No. 2006-311782

In this type of rotor, it is required to stably hold the magnets in the magnet hole of the rotor core in a positioned state. In addition, regardless of whether the magnet is held by resin or by a foam sheet, there is room for improvement in terms of facilitating manufacturing by standardizing the constituent members of the rotor core and stabilizing the magnetic characteristics of the rotor. rice field.

The present invention provides a rotor, a rotating electrical machine, and a rotating electric machine that can facilitate manufacturing by standardizing the constituent members of a rotor core and stabilize the magnetic characteristics of the rotor, regardless of the type of the intervening portion that holds the magnet in the magnet hole. One object is to provide a driving device.

One aspect of the rotor of the present invention includes an annular rotor core centered on a central axis, magnets arranged in magnet holes extending in the axial direction of the rotor core, and interposed between the inner wall of the magnet holes and the magnets. and an intervening portion. The outer surface of the magnet has a first surface extending in a first direction when viewed from the axial direction and a second surface extending in a second direction perpendicular to the first direction when viewed from the axial direction. . The magnet hole has a plurality of first holes provided along the axial direction, and a second hole disposed between the first holes adjacent to each other in the axial direction and communicating with the first holes. . The inner wall of the first hole has a first projection facing the first surface and a second projection facing the second surface. Between the first projections arranged in the axial direction and between the second projections arranged in the axial direction, gaps are provided in which a part of the intervening portion can be arranged.

One aspect of the rotating electric machine of the present invention includes the rotor described above and a stator arranged radially outside the rotor.

One aspect of the drive device of the present invention includes the rotating electric machine described above and a transmission device connected to the rotor.

According to the rotor, the rotating electric machine, and the driving device of the above aspect of the present invention, regardless of the type of the intervening portion that holds the magnet in the magnet hole, the constituent members of the rotor core are made common to facilitate manufacturing, and the rotor can be manufactured easily. Magnetic properties can be stabilized.

FIG. 1 is a schematic configuration diagram schematically showing the driving device of this embodiment. FIG. 2 is a front view showing part of the rotor. FIG. 3 is a perspective view showing part of the rotor core. FIG. 4 is a front view (plan view) of one of a plurality of laminations of the rotor core viewed from the axial direction. 5 is a front view showing an enlarged part of the rotor of FIG. 2. FIG. FIG. 6 is a side view showing a foam sheet. FIG. 7 is a perspective view showing a foam sheet. FIG. 8 is a perspective view explaining how to attach the foam sheet to the magnet. FIG. 9 is a front view showing part of the rotor of the first modified example of this embodiment. FIG. 10 is a front view showing an enlarged part of the rotor of the second modified example of the present embodiment. FIG. 11 is a front view showing an enlarged part of the rotor of the third modified example of the present embodiment. FIG. 12 is a front view showing an enlarged part of the rotor of the fourth modified example of the present embodiment. FIG. 13 is a sectional view showing a rotor of a fifth modified example of this embodiment.

In the following description, the vertical direction is defined based on the positional relationship when the drive system of the embodiment is mounted on a vehicle positioned on a horizontal road surface. In other words, the relative positional relationship in the vertical direction, which will be described in the following embodiments, should be satisfied at least when the driving device is mounted on a vehicle positioned on a horizontal road surface.

In the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The +Z side is vertically upward, and the -Z side is vertically downward. In the following description, the vertically upper side is simply called "upper side", and the vertically lower side is simply called "lower side". The X-axis direction is a direction orthogonal to the Z-axis direction and is the front-rear direction of the vehicle on which the driving device is mounted. In the following embodiments, the +X side is the front side of the vehicle and the -X side is the rear side of the vehicle. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and is the left-right direction of the vehicle, that is, the vehicle width direction. In the following embodiments, the +Y side is the left side of the vehicle and the -Y side is the right side of the vehicle. The front-rear direction and the left-right direction are horizontal directions orthogonal to the vertical direction.

Note that the positional relationship in the longitudinal direction is not limited to the positional relationship in the following embodiments, and the +X side may be the rear side of the vehicle and the −X side may be the front side of the vehicle. In this case, the +Y side is the right side of the vehicle and the -Y side is the left side of the vehicle. Moreover, in this specification, the “parallel direction” includes substantially parallel directions, and the “perpendicular direction” includes substantially perpendicular directions.

A central axis J appropriately shown in the drawings is a virtual axis extending in a direction intersecting the vertical direction. More specifically, the central axis J extends in the Y-axis direction perpendicular to the vertical direction, that is, in the lateral direction of the vehicle. In the following description, unless otherwise specified, the direction parallel to the central axis J is simply referred to as the "axial direction", the radial direction about the central axis J is simply referred to as the "radial direction", and the central axis J is referred to as the "radial direction". The circumferential direction around the center, that is, the circumference of the central axis J is simply referred to as the "circumferential direction". The left side (+Y side) in the axial direction is called "one axial side", and the right side (−Y side) in the axial direction is called "the other axial side".

An arrow .theta. appropriately shown in the figure indicates the circumferential direction. In the following description, of the circumferential direction, the side that advances counterclockwise around the central axis J as viewed from the left side, that is, the side to which the arrow θ points (+θ side) is referred to as "one circumferential side". Of these, the side proceeding clockwise about the central axis J as viewed from the left side, that is, the side opposite to the side to which the arrow θ is directed (−θ side) is called the “other side in the circumferential direction”.

A drive device 100 of the present embodiment shown in FIG. 1 is mounted on a vehicle using a motor as a power source, such as a hybrid vehicle (HEV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), etc., and is used as the power source. be done. That is, drive device 100 rotates axle 64 of the vehicle.

The drive device 100 includes a rotating electrical machine 10 and a transmission device 60 . The transmission device 60 is connected to a later-described rotor 30 of the rotating electrical machine 10, and transmits rotation of the rotor 30, that is, rotation of the rotating electrical machine 10, to an axle 64 of the vehicle. The transmission device 60 of this embodiment has a gear housing 61 , a reduction gear 62 connected to the rotor 30 , and a differential gear 63 connected to the reduction gear 62 .

The gear housing 61 accommodates the reduction gear 62, the differential gear 63, and the oil O inside. The oil O is stored in the lower area inside the gear housing 61 . The oil O circulates in a coolant flow path 90, which will be described later. Oil O is used as a coolant for cooling rotating electric machine 10 . Also, the oil O is used as a lubricating oil for the reduction gear 62 and the differential gear 63 . As the oil O, for example, it is preferable to use an oil equivalent to automatic transmission fluid (ATF), which has a relatively low viscosity, in order to function as a refrigerant and a lubricating oil.

The differential gear 63 has a ring gear 63a. Torque output from the rotary electric machine 10 is transmitted to the ring gear 63 a via the reduction gear 62 . A lower end of the ring gear 63 a is immersed in the oil O stored in the gear housing 61 . The oil O is scooped up by the rotation of the ring gear 63a. The scooped-up oil O is supplied to, for example, the reduction gear 62 and the differential gear 63 as lubricating oil.

The rotating electrical machine 10 is a part that drives the driving device 100 . The rotating electrical machine 10 is positioned, for example, on the other axial side of the transmission device 60 . In this embodiment, the rotating electric machine 10 is a motor. The rotary electric machine 10 includes a motor housing 20 , a rotor 30 rotatable around a central axis J, a stator 40 , and a coolant supply section 50 .

The motor housing 20 accommodates the rotor 30 and the stator 40 inside. The motor housing 20 is connected to the gear housing 61 on the other side in the axial direction. The motor housing 20 has a peripheral wall portion 21 , a partition wall portion 22 and a lid portion 23 . In this embodiment, the peripheral wall portion 21 and the partition wall portion 22 are integrally formed. The lid portion 23 is separate from the peripheral wall portion 21 and the partition wall portion 22 .

The peripheral wall portion 21 has a tubular shape surrounding the central axis J and opening on the other side in the axial direction. The partition wall portion 22 is connected to one axial end portion of the peripheral wall portion 21 . The partition wall 22 separates the interior of the motor housing 20 and the interior of the gear housing 61 in the axial direction. The partition wall portion 22 has a partition wall opening 22 a that connects the inside of the motor housing 20 and the inside of the gear housing 61 . A bearing 34 is held in the partition portion 22 . The lid portion 23 is fixed to the end portion of the peripheral wall portion 21 on the other side in the axial direction. The lid portion 23 closes the opening of the peripheral wall portion 21 on the other side in the axial direction. A bearing 35 is held in the lid portion 23 .

As shown in FIGS. 1 and 2 , the rotor 30 has an annular rotor core 32 centered on the central axis J, magnets 36 , an intervening portion 37 , and a shaft 31 .

As shown in FIG. 1, shaft 31 extends axially and is fixed to rotor core 32 . Specifically, the outer peripheral surface of the shaft 31 and the inner peripheral surface of the central hole 32a of the rotor core 32, which will be described later, are fixed to each other. The shaft 31 is rotatable around the central axis J. As shown in FIG. Shaft 31 is rotatably supported by bearings 34 and 35 . The shaft 31 in this embodiment is a hollow shaft. The shaft 31 is cylindrical with the central axis J as the center. The shaft 31 is provided with a hole 33 that connects the inside of the shaft 31 and the outside of the shaft 31 . The shaft 31 extends across the interior of the motor housing 20 and the interior of the gear housing 61 . One axial end of the shaft 31 protrudes into the gear housing 61 . A reduction gear 62 is connected to one end of the shaft 31 in the axial direction.

The rotor core 32 has a substantially cylindrical shape centered on the central axis J. As shown in FIG. The rotor core 32 has a central hole 32a that axially penetrates the rotor core 32 . The central hole 32a has a substantially circular shape centered on the central axis J. As shown in FIG. The shaft 31 is axially passed through the central hole 32a. The inner peripheral surface of the central hole 32 a is fixed to the outer peripheral surface of the shaft 31 .

The rotor core 32 is made of magnetic material. As shown in FIG. 3, the rotor core 32 has a plurality of laminations 80 stacked in the axial direction. The lamination 80 is a plate-like member. The plate surface of the lamination 80 faces the axial direction. FIG. 4 is a front view (plan view) of one of the laminations 80 of the rotor core 32 as seen from the axial direction. As shown in FIG. 4, the lamination 80 has a substantially annular plate shape centered on the central axis J. As shown in FIG. The lamination 80 is, for example, an electromagnetic steel sheet.

As shown in FIGS. 2 and 4, the rotor core 32 has multiple magnet holes 38 . Each magnet hole 38 is arranged in a portion of the rotor core 32 other than the central hole 32a. More specifically, when viewed from the axial direction, the magnet holes 38 are arranged radially outside and circumferentially spaced apart from the central hole 32a. Each magnet hole 38 axially penetrates the rotor core 32 . That is, the magnet hole 38 extends axially. As shown in FIG. 2, a magnet 36 is arranged in each magnet hole 38 . That is, a plurality of magnets 36 are provided. One magnet 36 is arranged in each magnet hole 38 . The type of magnet 36 is not particularly limited. The magnet 36 may be, for example, a neodymium magnet or a ferrite magnet. As shown in FIG. 8, the magnet 36 has, for example, a rectangular parallelepiped shape elongated in the axial direction. The magnet 36 extends, for example, from one axial end of the rotor core 32 to the other axial end. The axial dimension of the magnet 36 may be shorter than the axial dimension of the rotor core 32 (the axial dimension of the magnet hole 38).

As shown in FIG. 2, the plurality of magnet holes 38 includes a first magnet hole 38A extending in a direction perpendicular to the radial direction when viewed from the axial direction, and a first magnet hole 38A extending radially outward when viewed from the axial direction. and a pair of second magnet holes 38B, 38C extending toward. Note that the first magnet hole 38A need not necessarily extend straight in the direction perpendicular to the radial direction, and may extend in the circumferential direction.

The pair of second magnet holes 38B and 38C are arranged adjacent to each other in the circumferential direction. Of the pair of second magnet holes 38B and 38C arranged in the circumferential direction, one of the second magnet holes 38B extends toward one side (+θ side) in the circumferential direction as it goes radially outward when viewed from the axial direction. Of the pair of second magnet holes 38B and 38C arranged in the circumferential direction, the other second magnet hole 38C extends toward the other circumferential side (−θ side) as it goes radially outward when viewed from the axial direction. . That is, the distance between the pair of second magnet holes 38B and 38C in the circumferential direction gradually increases toward the radially outer side. The first magnet hole 38A is arranged in the circumferential direction between the radially outer ends of the pair of second magnet holes 38B and 38C.

In this embodiment, as shown in FIG. 2, a set S of magnet holes 38 including one first magnet hole 38A and a pair of second magnet holes 38B and 38C is triangular when viewed from the axial direction. placed. That is, one first magnet hole 38A and two second magnet holes 38B and 38C included in one set S are arranged so as to form three sides of one substantially triangular shape when viewed from the axial direction. A plurality of sets S of magnet holes 38 are arranged in the rotor core 32 in the circumferential direction (see FIG. 4). In this embodiment, eight sets S of magnet holes 38 are provided at equal intervals in the circumferential direction. Note that the set S may also be referred to as a magnet hole gathering portion formed by gathering a plurality of magnet holes 38, or a magnet holding area which is an area for holding the magnet 36 when viewed from the axial direction.

In this embodiment, the magnets 36 arranged in the first magnet holes 38A are magnetized in the radial direction. That is, the radially outer portion of the magnet 36 arranged in the first magnet hole 38A is the N pole (or S pole). The radially inner portion of the magnet 36 arranged in the first magnet hole 38A has a magnetic pole (that is, S pole (or N pole)) that is different from the radially outer magnetic pole.

Similarly, in this embodiment, the magnets 36 arranged in the pair of second magnet holes 38B and 38C are magnetized in a direction perpendicular to the longitudinal direction of the magnets 36 when viewed from the axial direction. That is, the part on the other side in the circumferential direction of the magnet 36 arranged in one of the second magnet holes 38B is the N pole (or S pole). A portion of the magnet 36 arranged in the second magnet hole 38B on one side in the circumferential direction has a magnetic pole (that is, S pole (or N pole)) different from the magnetic pole on the other side in the circumferential direction.

The part on one side in the circumferential direction of the magnet 36 arranged in the other second magnet hole 38C is the N pole (or S pole). A portion of the magnet 36 located in the second magnet hole 38C on the other side in the circumferential direction has a magnetic pole (that is, S pole (or N pole)) different from the magnetic pole on the one side in the circumferential direction.

As shown in FIG. 2, the first magnet hole 38A and the second magnet holes 38B, 38C have a common configuration. The configuration common to the first magnet hole 38A and the second magnet holes 38B and 38C will be described below with reference to FIGS. 2 to 5. FIG. 5 is a front view showing an enlarged part of the rotor 30 of FIG. 2. As shown in FIG.

In this embodiment, as seen from the axial direction as shown in FIG. It is called two directions D2. Each magnet hole 38 extends in the second direction D2 when viewed from the axial direction. The magnets 36 arranged in the respective magnet holes 38 also extend in the second direction D2 when viewed from the axial direction. In the case of the first magnet hole 38A, the second direction D2 is a direction perpendicular to the radial direction. In the case of the second magnet holes 38B and 38C, the second direction D2 is a direction extending radially outward and circumferentially. That is, the second direction D2 in the case of the second magnet hole 38B is a direction extending toward one side in the circumferential direction as it goes radially outward, as shown in FIG. The second direction D2 in the case of the second magnet hole 38C is, as shown in FIG. 2, a direction extending toward the other side in the circumferential direction as it goes radially outward.

The outer surface of the magnet 36 includes a first surface 36a extending in the first direction D1 when viewed from the axial direction and a second surface 36b extending in the second direction D2 perpendicular to the first direction D1 when viewed from the axial direction. and a corner portion 36c where the first surface 36a and the second surface 36b are connected.

A pair of first surfaces 36a are provided on the outer side surface of the magnet 36 . On the outer surface of the magnet 36, the pair of first surfaces 36a of the magnet 36 are positioned apart in the second direction D2. The pair of first surfaces 36a face opposite sides in the second direction D2. A pair of second surfaces 36 b are provided on the outer side surface of the magnet 36 . On the outer surface of the magnet 36, the pair of second surfaces 36b of the magnet 36 are positioned apart in the first direction D1. The pair of second surfaces 36b face opposite sides in the first direction D1. The corner portion 36c is arranged at a corner of the outer surface of the magnet 36 when viewed from the axial direction. Four corner portions 36 c are provided on the outer surface of the magnet 36 .

The inner wall of the magnet hole 38 extends in the second direction D2 when viewed from the axial direction and has a facing wall surface 38c facing the second surface 36b in the first direction D1. The facing wall surface 38c is a surface facing the first direction D1. The opposing wall surface 38c extends in a direction perpendicular to the first direction D1. A pair of opposed wall surfaces 38 c are provided on the inner wall of the magnet hole 38 . In the inner wall of the magnet hole 38, a pair of opposed wall surfaces 38c are positioned apart in the first direction D1. The pair of opposing wall surfaces 38c are arranged to face each other in the first direction D1.

In this embodiment, as shown in FIG. 2, of the pair of facing wall surfaces 38c of each magnet hole 38, one of the facing wall surfaces 38c located radially inward faces at least the radially outer side. One facing wall surface 38 c faces one second surface 36 b of the pair of second surfaces 36 b of the magnet 36 located radially inward.

Of the pair of opposing wall surfaces 38c of each magnet hole 38, the other opposing wall surface 38c positioned radially outward faces at least radially inward. The other facing wall surface 38 c faces the other second surface 36 b of the pair of second surfaces 36 b of the magnet 36 located radially outward.

As shown in FIG. 3, the magnet hole 38 is arranged between a plurality of first hole portions 38a provided along the axial direction and adjacent first hole portions 38a in the axial direction, and communicates with the first hole portions 38a. and a second hole portion 38b. In this embodiment, a plurality of second holes 38b are also provided along the axial direction. The first hole portion 38a and the second hole portion 38b overlap each other when viewed in the axial direction. The first hole portions 38a and the second hole portions 38b are alternately arranged along the axial direction. The first hole portion 38a and the second hole portion 38b are holes that axially penetrate the lamination 80, respectively. According to this embodiment, by laminating a plurality of laminations 80 in the axial direction, the first hole portion 38a and the second hole portion 38b of the magnet hole 38 can be arranged side by side in the axial direction. Therefore, it is easy to manufacture the rotor 30 .

As shown in FIGS. 2, 3 and 5, the inner wall of the first hole portion 38a includes a first projection 38aa facing the first surface 36a, a second projection 38ab facing the second surface 36b, and a first projection 38ab facing the second surface 36b. and a recess 38ac arranged between the protrusion 38aa and the second protrusion 38ab.

At least one first projection 38aa is provided on the inner wall of the first hole portion 38a. In the present embodiment, a plurality of first protrusions 38aa are provided on the inner wall of the first hole portion 38a at intervals in the second direction D2. Specifically, a pair of first projections 38aa are provided on the inner wall of the first hole portion 38a. The first protrusion 38aa protrudes from the opposing wall surface 38c. More specifically, in the present embodiment, the first protrusion 38aa protrudes from one of the pair of opposed wall surfaces 38c of the magnet hole 38 located radially inward.

The first projection 38aa faces the first surface 36a of the magnet 36 in the second direction D2. The first projection 38aa may be in contact with the first surface 36a, or may be opposed to the first surface 36a with a gap therebetween. According to the present embodiment, the first protrusion 38aa faces the first surface 36a of the magnet 36, so that the magnet 36 is positioned in the second direction D2 within the magnet hole 38, and the magnet 36 is positioned in a foam sheet 37A or a foam sheet 37A described later. When held by the intervening portion 37 such as the resin 37B, the movement of the magnet 36 in the second direction D2 is suppressed.

As shown in FIG. 2, in this embodiment, the pair of first projections 38aa faces the pair of first surfaces 36a. More specifically, the first protrusion 38aa located on one side in the second direction D2 faces the first surface 36a of the magnet 36 located on one side in the second direction D2. The first projection 38aa located on the other side in the second direction D2 faces the first surface 36a of the magnet 36 located on the other side in the second direction D2. That is, the magnet 36 is arranged between two adjacent first projections 38aa in the second direction D2. According to this embodiment, the magnet 36 can be held down on both sides in the second direction D2 by the plurality of first protrusions 38aa. Positioning of the magnet 36 in the second direction D2 with respect to the magnet hole 38 can be performed more stably.

As shown in FIG. 3, a plurality of first protrusions 38aa are provided on the inner wall of the magnet hole 38 along the axial direction. A gap is provided between the first protrusions 38aa arranged in the axial direction. In the present embodiment, the row of the first projections 38aa formed by arranging the plurality of first projections 38aa in the axial direction is arranged between the end of the magnet hole 38 on one side in the second direction D2 and the end on the other side in the second direction D2. are provided at the ends, respectively.

As shown in FIGS. 2, 3 and 5, at least one second projection 38ab is provided on the inner wall of the first hole portion 38a. In the present embodiment, a plurality of second protrusions 38ab are provided on the inner wall of the first hole portion 38a at intervals in the second direction D2. Specifically, a pair of second projections 38ab are provided on the inner wall of the first hole portion 38a. The second protrusion 38ab protrudes from the opposing wall surface 38c. More specifically, in the present embodiment, the second projection 38ab protrudes from one of the pair of opposed wall surfaces 38c of the magnet hole 38 located radially inward.

The dimension of the second protrusion 38ab protruding from the opposing wall surface 38c in the first direction D1 is smaller than the dimension of the first protrusion 38aa protruding from the opposing wall surface 38c in the first direction D1. The second protrusion 38ab is arranged between two adjacent first protrusions 38aa in the second direction D2.

The second protrusion 38ab faces the second surface 36b of the magnet 36 in the first direction D1. According to the present embodiment, the magnet 36 is positioned in the first direction D1 within the magnet hole 38 by the second protrusion 38ab, and the magnet 36 moves in the first direction D1 when the magnet 36 is held by the intervening portion 37. can be suppressed.

As shown in FIG. 2, in the present embodiment, the pair of second projections 38ab of the first hole 38a is aligned with one of the pair of second surfaces 36b of the magnet 36 located radially inward. opposite. More specifically, the second projection 38ab positioned on one side in the second direction D2 faces the end portion on one side in the second direction D2 of one of the second surfaces 36b. The second protrusion 38ab positioned on the other side in the second direction D2 faces the end portion on the other side in the second direction D2 of one of the second surfaces 36b.

As shown in FIG. 5, in this embodiment, a gap G is provided between the second surface 36b and the second projection 38ab. By providing the gap G between the second surface 36b and the second projection 38ab, a clearance is provided in the first direction D1 when inserting the magnet 36 into the magnet hole 38. As shown in FIG. Therefore, the magnet 36 can be stably inserted into the magnet hole 38 without making the dimensional accuracy of the magnet 36 in the first direction D1 excessively strict, and the cost of the magnet 36 can be reduced. In addition, the second protrusion 38ab is not limited to this, and may be in contact with the second surface 36b.

As shown in FIG. 3, a plurality of second protrusions 38ab are provided on the inner wall of the magnet hole 38 along the axial direction. A gap is provided between the second projections 38ab arranged in the axial direction. In the present embodiment, the row of the second projections 38ab formed by aligning the plurality of second projections 38ab in the axial direction is located at the end of the magnet hole 38 on one side in the second direction D2 and on the other side in the second direction D2. are provided at the ends, respectively.

As shown in FIG. 5, the recess 38ac is arranged between the first projection 38aa and the second projection 38ab in the second direction D2. The recess 38ac has a recessed shape that is recessed more than the first projection 38aa and the second projection 38ab in the first direction D1. At least one recess 38ac is provided on the inner wall of the first hole 38a. In this embodiment, as shown in FIG. 2, a plurality of recesses 38ac are provided on the inner wall of the first hole 38a at intervals in the second direction D2. Specifically, a pair of recesses 38ac are provided on the inner wall of the first hole 38a.

The recessed portion 38ac faces the corner portion 36c of the magnet 36 . In the present embodiment, one of the two corners 36c of the plurality of corners 36c of the magnet 36, which faces one facing wall surface 38c, and one recess 38ac face each other. As shown in FIG. 5, the recess 38ac is arranged apart from the corner 36c in the first direction D1. According to the present embodiment, the corner 36c of the magnet 36 is arranged to face the recess 38ac, thereby preventing the corner 36c from coming into contact with the inner wall of the first hole 38a. Chipping of the corner portion 36c of the magnet 36 is suppressed.

As shown in FIGS. 2, 3 and 5, the inner wall of the second hole 38b has a third protrusion 38ba. At least one third projection 38ba is provided on the inner wall of the second hole portion 38b. The third protrusion 38ba protrudes from the opposing wall surface 38c. More specifically, in this embodiment, the third projection 38ba protrudes from one of the pair of opposed wall surfaces 38c of the magnet hole 38 located radially inward.

The third protrusion 38ba faces the first surface 36a of the magnet 36 with a gap therebetween in the second direction D2. That is, the third protrusion 38ba is arranged apart from the first surface 36a in the second direction D2.

As shown in FIG. 2, in the present embodiment, the third magnet provided in the second hole portion 38b is provided in the first magnet hole 38A, the second magnet hole 38B, and the second magnet hole 38C. The number and arrangement of protrusions 38ba are different.

In the case of the first magnet hole 38A, a plurality of third protrusions 38ba are provided on the inner wall of the second hole portion 38b at intervals in the second direction D2. Specifically, a pair of third protrusions 38ba are provided on the inner wall of the second hole 38b. The pair of third protrusions 38ba are arranged at both circumferential ends of the second hole portion 38b. The pair of third protrusions 38ba are arranged at one end of the second hole portion 38b in the second direction D2 and the other end thereof in the second direction D2.

The pair of third protrusions 38ba face the pair of first surfaces 36a of the magnet 36 with a space therebetween. More specifically, the third projection 38ba located on one side in the second direction D2 faces the first surface 36a of the magnet 36 located on one side in the second direction D2 with a gap in the second direction D2. The third projection 38ba located on the other side in the second direction D2 faces the first surface 36a of the magnet 36 located on the other side in the second direction D2 with a gap in the second direction D2.

In the case of the second magnet hole 38B, one third protrusion 38ba is provided on the inner wall of the second hole portion 38b. One third projection 38ba is arranged at the radially outer end of the second hole portion 38b. One third projection 38ba is arranged at one end of the second hole 38b in the second direction D2. One third projection 38ba faces the first surface 36a positioned on one side in the second direction D2 of the pair of first surfaces 36a of the magnet 36 with a gap in the second direction D2.

In the case of the second magnet hole 38C, one third protrusion 38ba is provided on the inner wall of the second hole portion 38b. One third projection 38ba is arranged at the radially outer end of the second hole portion 38b. One third projection 38ba is arranged at the end of the second hole 38b on the other side in the second direction D2. One third projection 38ba faces the first surface 36a of the pair of first surfaces 36a of the magnet 36 located on the other side in the second direction D2 with a gap in the second direction D2.

As shown in FIGS. 2 and 5 , the interposed portion 37 is interposed between the inner wall of the magnet hole 38 and the magnet 36 . The interposed portion 37 is provided in each magnet hole 38 . That is, a plurality of intervening portions 37 are provided. In this embodiment, the intervening portion 37 has a foam sheet 37A. At least one foam sheet 37</b>A is provided between the inner wall of the magnet hole 38 and the magnet 36 . The foam sheet 37A is interposed between the opposing wall surface 38c and the second surface 36b. More specifically, in the present embodiment, the foam sheet 37A is positioned between one opposing wall surface 38c located radially inside the magnet hole 38 and one second surface 36b located radially inside the magnet 36. intervene in

In this embodiment, as indicated by the arrows in FIG. 2, the foam sheet 37A expanded by heating pushes the magnets 36 at least radially outward when the rotor 30 is manufactured. The other second surface 36 b located is pressed against the other opposing wall surface 38 c located radially outside the magnet hole 38 . By curing the foam sheet 37A in this state, the second surface 36b of the magnet 36 and the opposite wall surface 38c of the magnet hole 38 are kept in close contact with each other. Therefore, even if a centrifugal force acts on the magnets 36 when the rotor 30 rotates, the magnets 36 are prevented from being displaced radially outward in the magnet holes 38 or rattling. Therefore, it is possible to suppress changes in the magnetic properties due to positional displacement, looseness, and the like of the magnet 36 .

As shown in FIG. 2, in each magnet hole 38, a portion of the foam sheet 37A is arranged between two adjacent second projections 38ab in the second direction D2. According to this embodiment, the foam sheet 37A can be pressed on both sides in the second direction D2 by the plurality of second protrusions 38ab. The positioning of the foam sheet 37A in the second direction D2 with respect to the magnet hole 38 can be stably performed.

More specifically, as shown in FIG. 8, the foam sheet 37A is a sheet-like member and is inserted into the magnet hole 38 together with the magnet 36 while attached to the outer surface of the magnet 36. As shown in FIG. In this embodiment, the foam sheet 37A is in the form of a rectangular, ie, square, sheet extending in the axial direction. However, the foam sheet 37A is not limited to this, and may have a sheet shape such as a polygonal shape other than a square shape, an elliptical shape, or a circular shape. The foam sheet 37A arranged in the magnet hole 38 is foamed by heating, expands in volume, and hardens in the expanded state. The expanded foam sheet 37A presses the magnet 36 toward the inner wall of the magnet hole 38. As shown in FIG. Thereby, the foam sheet 37A holds the magnet 36 in the magnet hole 38. As shown in FIG.

As shown in FIG. 6, the foam sheet 37A is configured by laminating a plurality of layers. In this embodiment, the foam sheet 37A has a base layer 37a, a pair of foam adhesive layers 37b and 37c, and a release liner 37e.

The base material layer 37a is film-like and is made of resin, for example. The base material layer 37a is made of, for example, polyethylene naphthalate (PEN), polyphenylene sulfide (PPS), polyethylene terephthalate (PET), or polyimide (PI).

Each of the pair of foamed adhesive layers 37b and 37c contains, for example, a thermosetting resin and a foaming agent that can be foamed by heating. The foaming agent preferably foams at a temperature lower than the curing temperature of the thermosetting resin and reaches the maximum expanded state (maximum foamed state). As a result, in the process of increasing the temperature when the rotor is heated, the thermosetting resin starts to harden after the foaming of the foaming agent is completed. The magnet 36 can be stably fixed to the inner wall of the magnet hole 38 .

As the foaming agent, an organic solvent having a low melting point, such as a microcapsule containing an alcohol or the like can be used. Moreover, it is preferable that the thermosetting resin is composed of a thermosetting adhesive. Examples of the thermosetting adhesive include phenol-based adhesives, urethane-based adhesives, and epoxy-based adhesives. It is more preferable to use an epoxy-based adhesive as the thermosetting adhesive because it is excellent in adhesive strength, chemical resistance, and the like.

Of the pair of foamed adhesive layers 37b and 37c, one foamed adhesive layer 37b is arranged on one surface (for example, the surface) of the base material layer 37a, and the other foamed adhesive layer 37c is arranged on the other side of the base material layer 37a. It is placed on the face (for example, the back face). The other foam adhesive layer 37c has an adhesive surface 37d on the surface facing away from the base material layer 37a in the thickness direction of the foam sheet 37A.

A release liner 37e covers the adhesive surface 37d. As shown in FIG. 7, a release liner 37e is releasably attached to the adhesive surface 37d. The release liner 37e is removed from the foam sheet 37A when attaching the foam sheet 37A to the magnet 36. FIG. As shown in FIG. 8, the foam sheet 37A is attached to the magnet 36 by attaching the adhesive surface 37d exposed by removing the release liner 37e to the outer surface of the magnet 36. As shown in FIG. More specifically, the foam sheet 37A is attached to one of the outer surfaces of the magnet 36, the second surface 36b.

As shown in FIGS. 3 and 5, in each magnet hole 38, a part of the intervening portion 37 can be arranged between the first projections 38aa arranged in the axial direction and between the second projections 38ab arranged in the axial direction. gap is provided. In this embodiment, as shown in FIG. 5, a part of the foam sheet 37A is arranged in the gap between the second projections 38ab arranged in the axial direction. Specifically, when the intervening portion 37 has the foam sheet 37A, a part of the foam sheet 37A expanded by heating enters the gap between the second projections 38ab arranged in the axial direction and hardens when the rotor 30 is manufactured. . As a result, an anchor effect is obtained, and movement of the foam sheet 37A with respect to the magnet hole 38 is suppressed. Therefore, it is possible to stably hold the magnet 36 positioned in the magnet hole 38 . In addition, part of the foam sheet 37A expanded by heating enters the gaps between the second protrusions 38ab, so that the foam sheet 37A is prevented from protruding from the end surface of the rotor core 32 facing the axial direction. Therefore, for example, when a plurality of rotor cores 32 are arranged in close contact with each other in the axial direction, the hardened foam sheet 37A protruding from the end faces of the rotor cores 32 may interfere with close contact between the rotor cores 32. suppressed.

In this embodiment, the multiple laminations 80 of the rotor core 32 have the same shape. As shown in FIG. 4, each lamination 80 has a first hole 38a and a second hole 38b whose position in the circumferential direction is different from that of the first hole 38a. Specifically, the lamination 80 has at least one circumferentially extending first region A1 and at least one circumferentially extending second region A2. The first area A1 and the second area A2 are arranged side by side in the circumferential direction. Specifically, the first regions A1 and the second regions A2 are alternately arranged in the circumferential direction. The first hole 38a is arranged in the first region A1 of the lamination 80. As shown in FIG. The second hole 38b is arranged in the second area A2 of the lamination 80. As shown in FIG. Specifically, a plurality of first holes 38a are provided in the first region A1. A plurality of second holes 38b are provided in the second region A2.

As shown in FIG. 4, when viewed from the axial direction, the central angle α about the central axis J of the first area A1 and the central angle β about the central axis J of the second area A2 are equal to each other. . In this embodiment, the central angles α and β are each 180°. However, not limited to this, the central angles α and β may each be 90°, for example. In this case, the lamination 80 is provided with two first areas A1 and two second areas A2. Also, the central angles α and β may each be 45°, for example. In this case, the lamination 80 is provided with four first areas A1 and four second areas A2. That is, each angle of the central angles α and β of the lamination 80 and each number of the first regions A1 and the second regions A2 are not limited to the example of this embodiment.

As shown in FIG. 3, the axially adjacent laminations 80 are arranged circumferentially offset by a central angle α (β). As a result, the first area A1 of one lamination 80 and the second area A2 of another lamination 80 axially aligned with the one lamination 80 overlap when viewed in the axial direction. More specifically, the first hole 38a of one lamination 80 and the second hole 38b of the other lamination 80 overlap when viewed in the axial direction.

According to the present embodiment, by stacking the laminations 80 in the axial direction while shifting the positions of the laminations 80 in the circumferential direction, that is, by laminating the laminations 80 by rotation, the laminations 80 are made common to one type of component, while the laminations 80 are stacked in the axial direction. A magnet hole 38 can be provided in which the first hole portion 38a and the second hole portion 38b are aligned. Therefore, it is easy to manufacture the rotor 30 .

Although not shown, the plurality of laminations includes a first lamination having the first hole portion 38a and not having the second hole portion 38b and a lamination having the second hole portion 38b and having the first hole portion 38a. and no second lamination, wherein the at least one first lamination and the at least one second lamination are arranged axially side by side. Even in this case, the first hole portion 38a of the first lamination and the second hole portion 38b of the second lamination are arranged so as to overlap each other when viewed in the axial direction, so that the first hole portion 38a and the first hole portion 38a in the axial direction It is possible to provide a magnet hole 38 aligned with the second hole 38b.

Further, in the above-described embodiment, the laminations 80 are laminated in the axial direction while shifting the positions in the circumferential direction. However, the axially adjacent laminations 80 do not have to be circumferentially offset from each other. That is, a plurality of laminations 80 laminated in the axial direction with the same circumferential positions are offset from at least one other lamination 80 by a central angle α (or β) in the circumferential direction. may be placed. In this case, in the plurality of laminations 80 laminated in the axial direction with the same circumferential position, the plurality of first hole portions 38a or the plurality of second hole portions 38b are arranged side by side in the axial direction. . Therefore, the plurality of first protrusions 38aa are adjacent to each other in the axial direction. A plurality of second projections 38ab are axially adjacent to each other. A plurality of recesses 38ac are axially adjacent to each other.

The plurality of laminations may include a first lamination having the first hole portion 38a and not having the second hole portion 38b and a lamination having the first hole portion 38a and the second hole portion 38b. good. The plurality of laminations may include a second lamination with second holes 38b and no first holes 38a and a lamination with first holes 38a and second holes 38b. The plurality of laminations may include a first lamination, a second lamination, and a lamination having a first hole 38a and a second hole 38b.

As shown in FIGS. 2 and 5, the magnet holes 38 have flux barriers 38e. The flux barrier 38e is arranged adjacent to the magnet 36 in the second direction D2. In this specification, a "flux barrier" is a portion that can suppress the flow of magnetic flux. In other words, it is difficult for the magnetic flux to pass through the flux barrier. The flux barrier is not particularly limited as long as it can suppress the flow of magnetic flux, and may include a void portion or a non-magnetic portion such as a resin portion. In this embodiment, the flux barrier 38e is a gap formed by a hole penetrating the rotor core 32 in the axial direction. In this embodiment, a pair of flux barriers 38e are provided at both ends of the magnet hole 38 in the second direction D2.

As shown in FIGS. 3 and 4, the flux barrier 38e communicates with the first flux barrier portion 38ea arranged in the first hole portion 38a and the first flux barrier portion 38ea, and is arranged in the second hole portion 38b. and a second flux barrier portion 38eb. In the present embodiment, a pair of first flux barrier portions 38ea are arranged at both end portions of the first hole portion 38a in the second direction D2. A pair of second flux barrier portions 38eb are arranged at both end portions of the second hole portion 38b in the second direction D2. The first flux barrier portion 38ea and the second flux barrier portion 38eb overlap each other when viewed in the axial direction. The first flux barrier portions 38ea and the second flux barrier portions 38eb are alternately arranged along the axial direction. According to this embodiment, by laminating a plurality of laminations 80 in the axial direction, the first flux barrier portion 38ea and the second flux barrier portion 38eb of the flux barrier 38e can be arranged side by side in the axial direction.

As shown in FIG. 1, the stator 40 faces the rotor 30 with a gap in the radial direction. More specifically, the stator 40 is arranged radially outside the rotor 30 . The stator 40 is fixed inside the motor housing 20 . Stator 40 includes stator core 41 and coil assembly 42 .

The stator core 41 has an annular shape surrounding the central axis J of the rotary electric machine 10 . The stator core 41 is positioned radially outside the rotor 30 . Stator core 41 surrounds rotor 30 . The outer peripheral surface of stator core 41 has a portion that contacts the inner peripheral surface of motor housing 20 . The stator core 41 is fixed to the motor housing 20 by fastening members such as bolts (not shown).

The coil assembly 42 has a plurality of coils 42c attached to the stator core 41 along the circumferential direction. The plurality of coils 42c are arranged on the stator core 41 via a member made of an insulating material (not shown). A plurality of coils 42c are arranged along the circumferential direction. More specifically, the plurality of coils 42c are arranged at regular intervals along the circumferential direction. Although not shown, the coil assembly 42 may have a binding member or the like that binds the coils 42c, or may have a connecting wire that connects the coils 42c.

The coil assembly 42 has coil ends 42 a and 42 b axially protruding from the stator core 41 . The coil end 42a is a portion that protrudes from the stator core 41 to one side in the axial direction. The coil end 42b is a portion protruding from the stator core 41 to the other side in the axial direction. Coil end 42 a includes a portion of each coil 42 c included in coil assembly 42 that protrudes to one side in the axial direction from stator core 41 . Coil end 42 b includes a portion of each coil 42 c included in coil assembly 42 that protrudes to the other side in the axial direction from stator core 41 . In this embodiment, the outer appearance of the coil ends 42a and 42b is substantially annular with the center axis J as the center when viewed from the axial direction. Although not shown, the coil ends 42a and 42b may include a binding member or the like that binds the coils 42c, or may include a connecting wire that connects the coils 42c.

The coolant supply part 50 has a tubular shape extending in the axial direction. In this embodiment, the coolant supply portion 50 is a pipe extending in the axial direction. Both axial ends of the coolant supply portion 50 are supported by the motor housing 20 . One end in the axial direction of the coolant supply portion 50 is supported by, for example, the partition wall portion 22 . The end portion of the coolant supply portion 50 on the other side in the axial direction is supported by, for example, the lid portion 23 . The coolant supply portion 50 is positioned radially outward of the stator 40 . In this embodiment, the coolant supply unit 50 is positioned above the stator 40 .

The coolant supply unit 50 has a supply port 50a that supplies oil O as a coolant to the stator 40 . In the present embodiment, the supply port 50a is a jetting port that jets part of the oil O that has flowed into the coolant supply portion 50 to the outside of the coolant supply portion 50 . A plurality of supply ports 50 a are provided in the coolant supply section 50 .

In the present embodiment, the driving device 100 is provided with a coolant channel 90 through which oil O as a coolant circulates. The coolant flow path 90 is provided across the inside of the motor housing 20 and the inside of the gear housing 61 . The coolant flow path 90 is a path through which the oil O stored in the gear housing 61 is supplied to the rotary electric machine 10 and returns to the gear housing 61 again. A pump 71 , a cooler 72 , and a coolant supply section 50 are provided in the coolant channel 90 . The coolant channel 90 has a first channel portion 91 , a second channel portion 92 , a third channel portion 93 , a fourth channel portion 94 and a fifth channel portion 95 . In the present embodiment, the fifth channel portion 95 may be called a "channel".

The first channel portion 91 , the second channel portion 92 , and the third channel portion 93 are provided on the wall portion of the gear housing 61 , for example. The fourth channel portion 94 is provided in the lid portion 23, for example. The first flow path portion 91 connects a portion of the gear housing 61 where the oil O is stored and the pump 71 . The second channel portion 92 connects the pump 71 and the cooler 72 . The third channel portion 93 connects the cooler 72 and the interior of the coolant supply portion 50 . In the present embodiment, the third flow path portion 93 is connected to one axial end portion of the coolant supply portion 50 . The fourth channel portion 94 connects the inside of the coolant supply portion 50 and the inside of the shaft 31 . In the present embodiment, the fourth flow path portion 94 is connected to the other axial end of the coolant supply portion 50 and the other axial end of the shaft 31 .

The fifth channel portion 95 , that is, the channel, is arranged over at least the inside of the shaft 31 and the inside of the rotor core 32 . That is, the rotor 30 includes a fifth channel portion 95 that is a channel. The channel has a shaft channel 95a arranged inside the shaft 31 and a flux barrier channel 95d connected to the shaft channel 95a and arranged inside the flux barrier 38e. In this embodiment, the shaft channel 95a and the flux barrier channel 95d are the hole 33 of the shaft 31, and a communication channel (illustrated omitted) are connected to each other. The flux barrier flow path 95d extends over the entire length of the rotor core 32 in the axial direction. In the present embodiment, part of the oil O that has flowed from the shaft flow path 95a into the flux barrier flow path 95d through the hole 33 and the communication flow path flows toward one side in the axial direction of the flux barrier flow path 95d, Another part of the oil O that has flowed into the flux barrier flow path 95d flows toward the other side in the axial direction through the flux barrier flow path 95d. As shown in FIG. 2, a pair of flux barrier flow paths 95d are provided at both ends of the magnet hole 38 in the second direction D2.

As shown in FIGS. 3 and 5, the fifth flow path portion 95, that is, the flow path, further includes a first inter-projection flow path 95e arranged in a gap between the first projections 38aa arranged in the axial direction, and a 95 f of passages between the second protrusions arranged in the gaps between the aligned second protrusions 38 ab. More specifically, the first inter-projection flow paths 95e are arranged at both ends of the magnet hole 38 in the second direction D2. The second inter-projection flow paths 95f are arranged at both ends of the magnet hole 38 in the second direction D2. A plurality of first inter-projection flow paths 95e are provided in the magnet hole 38 along the axial direction. A plurality of second inter-projection flow paths 95f are provided in the magnet hole 38 along the axial direction. The flux barrier channel 95d, the first inter-protrusion channel 95e, and the second inter-protrusion channel 95f communicate with each other.

As shown in FIG. 1, the oil O stored in the gear housing 61 is sucked up by the pump 71 through the first flow passage portion 91, and then flows from the pump 71 into the cooler 72 through the second flow passage portion 92. influx. The oil O that has flowed into the cooler 72 is cooled in the cooler 72 and then flows into the coolant supply section 50 through the third flow path section 93 . A portion of the oil O that has flowed into the coolant supply portion 50 is injected from the supply port 50 a and supplied to the stator 40 . Another portion of the oil O that has flowed into the coolant supply portion 50 flows into the interior of the shaft 31 through the fourth flow path portion 94 . A part of the oil O that has flowed into the shaft 31 passes through the shaft channel 95a, the hole 33, the communication channel, the flux barrier channel 95d, the first inter-protrusion channel 95e, and the second inter-protrusion channel 95f. and scatters to the stator 40. Another part of the oil O that has flowed into the shaft 31 passes through the shaft flow path 95a, is discharged into the gear housing 61 from the opening on one side in the axial direction of the shaft 31, and is stored in the gear housing 61 again. be.

The oil O supplied to the rotor 30 and stator 40 takes heat from the rotor 30 and stator 40 . The oil O that has cooled the rotor 30 and the stator 40 drops downward and accumulates in the lower area inside the motor housing 20 . The oil O accumulated in the lower region inside the motor housing 20 returns into the gear housing 61 through the partition wall opening 22 a provided in the partition wall portion 22 . As described above, the coolant flow path 90 supplies the oil O stored in the gear housing 61 to the rotor 30 and the stator 40 .

According to this embodiment, the magnet 36 can be cooled by flowing the oil O as a coolant through the flux barrier flow path 95d. Therefore, it is possible to suppress the change in the magnetic properties due to the temperature rise of the magnet 36 . Further, when an impact is applied to the rotating electric machine 10 from the outside and transmitted to the rotor 30, an effect of damping vibration (damper effect) is obtained by the oil O flowing through the flux barrier flow path 95d. Furthermore, the contact area between the magnet 36 and the oil O increases as the oil O flows through the first inter-projection flow path 95e and the second inter-projection flow path 95f via the flux barrier flow path 95d. can be cooled more stably. In addition, the oil O flowing through the first inter-projection flow path 95e and the second inter-projection flow path 95f also softens the impact and dampens the vibration.

It should be noted that the present invention is not limited to the above-described embodiments, and, for example, as described below, changes in configuration can be made without departing from the gist of the present invention. In the drawings of the respective modifications, the same reference numerals are given to the same constituent elements as in the above-described embodiment, and mainly different points will be described below.

FIG. 9 is a partial front view showing a first modification of the rotor 30 described in the above embodiment. Also in the first modified example, the first magnet hole 38A and the second magnet holes 38B, 38C have a configuration common to each other, as in the above-described embodiment. The configuration common to the first magnet hole 38A and the second magnet holes 38B and 38C will be described below with reference to FIG. Note that FIG. 9 shows a first magnet hole 38A as an example of the magnet hole 38. As shown in FIG.

In the first modification shown in FIG. 9, the first projection 38aa also protrudes from the other of the pair of opposed wall surfaces 38c of the magnet hole 38 located radially outward. More specifically, in the first modification, among the inner walls of the first hole portion 38a, the wall portion positioned on one facing wall surface 38c positioned radially inward is spaced apart from each other in the second direction D2, A plurality of first projections 38aa are provided. In the example shown in FIG. 9, a pair of first protrusions 38aa are provided on a wall portion positioned on one opposing wall surface 38c of the first hole portion 38a. A plurality of first protrusions 38aa are provided at intervals in the second direction D2 on a wall portion of the inner wall of the first hole portion 38a that is positioned on the other opposing wall surface 38c that is positioned radially outward. In the example shown in FIG. 9, a pair of first protrusions 38aa are provided on the wall portion positioned on the other opposing wall surface 38c of the first hole portion 38a.

Of the pair of first projections 38aa provided on the wall portion positioned on the other facing wall surface 38c of the first hole portion 38a, the first projection 38aa positioned on one side in the second direction D2 It faces the first surface 36a located on one side. Of the pair of first projections 38aa provided on the wall portion positioned on the other facing wall surface 38c of the first hole portion 38a, the first projection 38aa positioned on the other side in the second direction D2 It faces the first surface 36a located on the other side. That is, the magnet 36 is arranged between two first projections 38aa adjacent to each other in the second direction D2 on the wall portion located on the other opposing wall surface 38c of the first hole portion 38a. In the example shown in FIG. 9, one side of the second direction D2 corresponds to one side in the circumferential direction (+.theta. side), and the other side of the second direction D2 corresponds to the other side in the circumferential direction (-.theta. side).

According to the first modification, the magnet 36 can be held down on both sides in the second direction D2 by the plurality of first projections 38aa on the other facing wall surface 38c of the magnet hole 38 as well. Positioning of the magnet 36 in the second direction D2 with respect to the magnet hole 38 can be performed more stably.

In the first modification, of the pair of first protrusions 38aa provided on the wall portion positioned on one opposing wall surface 38c of the first hole portion 38a, the first protrusion 38aa located on one side in the second direction D2 and the first protrusion 38aa Of the pair of first projections 38aa provided on the wall portion positioned on the other opposing wall surface 38c of the one hole portion 38a, the first projection 38aa positioned on one side in the second direction D2 is aligned in the first direction D1. placed. Further, of the pair of first protrusions 38aa provided on the wall portion located on one of the opposing wall surfaces 38c of the first hole portion 38a, the first protrusion 38aa located on the other side in the second direction D2 and the first hole portion 38a Of the pair of first protrusions 38aa provided on the wall portion located on the other opposing wall surface 38c, the first protrusion 38aa located on the other side in the second direction D2 is arranged side by side in the first direction D1. That is, a plurality of first protrusions 38aa are provided on the inner wall of the first hole portion 38a so as to line up in the first direction D1. More specifically, in the first modification, a pair of first protrusions 38aa are arranged side by side in the first direction D1 at the end of the first hole 38a on one side in the second direction D2. A pair of first protrusions 38aa are arranged side by side in the first direction D1 at the end of the first hole portion 38a on the other side in the second direction D2.

Although not shown in particular, in the first modified example, a plurality of first protrusions 38aa arranged on one opposing wall surface 38c of the magnet hole 38 are provided along the axial direction. More specifically, a row of first projections 38aa formed by arranging a plurality of first projections 38aa in the axial direction is arranged between the end of one opposing wall surface 38c in the second direction D2 and the other end in the second direction D2. are provided at the ends of the side, respectively. A plurality of first protrusions 38aa arranged on the other opposing wall surface 38c of the magnet hole 38 are also provided along the axial direction. More specifically, a row of first projections 38aa formed by arranging a plurality of first projections 38aa in the axial direction is arranged between an end portion of the other opposing wall surface 38c on one side in the second direction D2 and an end portion on the other side in the second direction D2. are provided at the ends of the side, respectively. In each row of the first projections 38aa, gaps are provided between the first projections 38aa arranged in the axial direction.

In the first modification, the second protrusion 38ab also protrudes from the other opposing wall surface 38c. More specifically, in the first modification, among the inner walls of the first hole portion 38a, the wall portion positioned on one facing wall surface 38c positioned radially inward is spaced apart from each other in the second direction D2, A plurality of second projections 38ab are provided. In the example shown in FIG. 9, a pair of second protrusions 38ab are provided on a wall portion positioned on one opposing wall surface 38c of the first hole portion 38a. A plurality of second protrusions 38ab are provided at intervals in the second direction D2 on the inner wall of the first hole portion 38a located on the other opposing wall surface 38c located radially outward. In the example shown in FIG. 9, a pair of second projections 38ab are provided on the wall portion positioned on the other opposing wall surface 38c of the first hole portion 38a.

Of the pair of second projections 38ab provided on the wall portion positioned on the other facing wall surface 38c of the first hole portion 38a, the second projection 38ab positioned on one side in the second direction D2 is radially outward of the magnet 36. It faces the end on one side in the second direction D2 of the other second surface 36b. Of the pair of second projections 38ab provided on the wall portion positioned on the other facing wall surface 38c of the first hole portion 38a, the second projection 38ab positioned on the other side in the second direction D2 It faces the end of the surface 36b on the other side in the second direction D2. That is, in the second modified example, a plurality of second projections 38ab are provided on the inner wall of the first hole portion 38a so as to face each second surface 36b of the magnet 36 .

Although not shown in particular, in the first modified example, a plurality of second protrusions 38ab arranged on one opposing wall surface 38c of the magnet hole 38 are provided along the axial direction. More specifically, a row of the second projections 38ab formed by arranging a plurality of the second projections 38ab in the axial direction extends from the end portion of one opposing wall surface 38c on the second direction D2 side to the second direction D2 side of the other wall surface 38c. are provided at the ends of the side, respectively. A plurality of second protrusions 38ab arranged on the other opposing wall surface 38c of the magnet hole 38 are also provided along the axial direction. More specifically, a row of second projections 38ab formed by arranging a plurality of second projections 38ab in the axial direction is arranged between the end of the other opposing wall surface 38c on one side in the second direction D2 and the other end in the second direction D2. are provided at the ends of the side, respectively. In each row of the second projections 38ab, gaps are provided between the second projections 38ab arranged in the axial direction.

In the first modified example, a plurality of foam sheets 37A are provided. At least one of the plurality of foam sheets 37A is interposed between one opposing wall surface 38c located radially inside the magnet hole 38 and one second surface 36b located radially inside the magnet 36. do. At least one of the plurality of foam sheets 37A is located between the other opposing wall surface 38c located radially outside the magnet hole 38 and the other second surface 36b located radially outside the magnet 36. intervene in

In the first modified example, a part of the foam sheet 37A located radially inward is arranged in the gap between the second projections 38ab arranged in the axial direction on one opposing wall surface 38c. More specifically, the foam sheet 37A located radially inward in the gap between the second projections 38ab located on one side in the second direction D2 of one opposing wall surface 38c and arranged in the axial direction is inserted into the one side in the second direction D2. is placed. The end portion of the foam sheet 37A located radially inward on the other side of the second direction D2 is arranged in a gap between the second projections 38ab located on the other side of the opposing wall surface 38c on the other side of the second direction D2 and aligned in the axial direction. be done.

A portion of the foam sheet 37A positioned radially outward is arranged in the gap between the second projections 38ab arranged in the axial direction on the other facing wall surface 38c. More specifically, the foam sheet 37A located radially outward is inserted into the gap between the second projections 38ab located on one side in the second direction D2 of the other opposing wall surface 38c and arranged in the axial direction. is placed. The end portion of the foam sheet 37A located radially outward on the other side in the second direction D2 is arranged in the gap between the second projections 38ab located on the other side in the second direction D2 of the other facing wall surface 38c and arranged in the axial direction. be done.

In the first modification, when the rotor 30 is manufactured, the foam sheet 37A positioned radially inward expands due to heating, and a portion of the foam sheet 37A expands into the axially aligned second projections 38ab on one opposing wall surface 38c. It gets into the gaps between them and hardens. Also, the foam sheet 37A located radially outward expands due to heating, and a part of this foam sheet 37A enters the gap between the second projections 38ab arranged in the axial direction on the other facing wall surface 38c and hardens. Thereby, an anchor effect is obtained, and movement of each foam sheet 37A with respect to the magnet hole 38 is suppressed.

FIG. 10 is a partial front view showing a second modification of the rotor 30 described in the above embodiment, showing an enlarged view of the vicinity of the first projection 38aa and the second projection 38ab. In the second modification shown in FIG. 10, a part of the foam sheet 37A is arranged also in the gaps between the first projections 38aa arranged in the axial direction. Furthermore, a portion of the foam sheet 37A is also arranged in the concave portion 38ac. According to the second modification, a portion of the foamed sheet 37A expanded by heating enters the gaps between the first projections 38aa arranged in the axial direction and hardens, so that the anchoring effect is further enhanced. In addition, since a part of the foamed sheet 37A expanded by heating enters the concave portion 38ac and hardens, the anchoring effect is further enhanced. In addition, in the second modification, a part of the foam sheet 37A may not be arranged in the gap between the second projections 38ab arranged in the axial direction.

FIG. 11 is a partial front view showing a third modification of the rotor 30 described in the above embodiment, showing an enlarged view of the vicinity of the first protrusion 38aa and the second protrusion 38ab. In the third modification shown in FIG. 11, the intervening portion 37 has a resin 37B instead of the foam sheet 37A. Resin 37B is interposed between the inner wall of magnet hole 38 and magnet 36 . More specifically, between one opposing wall surface 38c and one second surface 36b, the gap between the flux barrier 38e, the axially aligned first projections 38aa, and the axially aligned second projections 38ab. A part of the resin 37B is arranged on at least one or more of them. Although not shown, in the third modification, part of the resin 37B may be arranged between the other facing wall surface 38c and the other second surface 36b. In the third modification, resin 37B is filled over the entire area between the inner wall of magnet hole 38 and magnet 36 .

When the intermediate portion 37 has the resin 37B as in the third modification, when the molten resin 37B is injection-molded into the magnet hole 38, the first projections 38aa aligned in the axial direction and the second projections 38aa aligned in the axial direction are formed. The resin 37B easily spreads over the entire magnet hole 38 through each gap between the protrusions 38ab, and is stably filled and solidified. Therefore, an unintended gap is less likely to occur inside the magnet hole 38, and the magnet 36 can be stably held in the magnet hole 38 in a positioned state.

Thus, according to the above-described embodiment and each modified example, the constituent members of the rotor core 32 can be shared regardless of whether the intervening portion 37 has the foam sheet 37A or the resin 37B. Therefore, the rotor 30 can be manufactured easily and the magnetic characteristics of the rotor 30 are stabilized regardless of the type of the intervening portion 37 .

In the third modification, the intervening portion 37 has a resin 37B, and part of the resin 37B is arranged in each of the first flux barrier portion 38ea and the second flux barrier portion 38eb. According to the third modification, when the molten resin 37B is injection-molded into the magnet hole 38, for example, the flux barrier 38e is used as a gate so that the resin 37B is injected into the first flux barrier portion 38ea and the second flux barrier portion 38eb, respectively. , and the resin 37B easily spreads over the entire magnet hole 38 through the gaps between the axially aligned first projections 38aa and between the axially aligned second projections 38ab.

FIG. 12 is a partial front view showing a fourth modification of the rotor 30 described in the above embodiment, showing an enlarged view of the vicinity of the first protrusion 38aa and the second protrusion 38ab. In the fourth modification shown in FIG. 12, the intervening portion 37 includes a foam sheet 37A interposed between the opposing wall surface 38c and the second surface 36b, and a resin 37B at least partially disposed on the flux barrier 38e. have. In the example shown in FIG. 12, a portion of the resin 37B is arranged between the first protrusions 38aa arranged in the axial direction. A part of the foam sheet 37A and a part of the resin 37B are arranged between the second projections 38ab arranged in the axial direction. However, not limited to this, in the fourth modification, a part of the foam sheet 37A is arranged between the second projections 38ab arranged in the axial direction, and a part of the foam sheet 37A and A part of the resin 37B may be arranged. That is, in the fourth modification, at least one of a portion of the resin 37B and a portion of the foam sheet 37A is arranged between the first projections 38aa arranged in the axial direction, and between the second projections 38ab arranged in the axial direction, At least one of a portion of the foam sheet 37A and a portion of the resin 37B is arranged.

FIG. 13 is a cross-sectional view showing a fifth modification of the rotor 30 described in the above embodiment. In a fifth modification shown in FIG. 13, a rotor 30 includes a pair of end plates 51 arranged at both ends of a rotor core 32 in the axial direction. The end plate 51 has, for example, a substantially annular plate shape centered on the central axis J. As shown in FIG. In the fifth modification, end plate 51 is fixed to rotor core 32 . The end plate 51 axially covers at least a portion of the magnet hole 38 . According to the fifth modification, the end plate 51 prevents foreign matter from entering the magnet hole 38 and prevents the magnet 36 from falling off from the rotor core 32 .

Also in the fifth modification shown in FIG. 13, the fifth flow path portion 95 has a flux barrier flow path 95d, a first inter-projection flow path 95e, and a second inter-projection flow path 95f. In the fifth modification, the shaft channel 95a, the flux barrier channel 95d, the first inter-protrusion channel 95e, and the second inter-protrusion channel 95f pass through the hole 33 of the shaft 31 and the end plate 51. They are connected to each other via the extending end plate channels 95c. The end plate channel 95c connects the hole 33, the flux barrier channel 95d, the first inter-protrusion channel 95e, and the second inter-protrusion channel 95f. Further, the oil O that has flowed from the shaft flow path 95a through the hole 33 and the end plate flow path 95c into the flux barrier flow path 95d, the first inter-projection flow path 95e, and the second inter-projection flow path 95f flows into the fifth flow path. It flows through the passage portion 95 toward one side in the axial direction.

In the above-described embodiment, an example was given in which the inner wall of the second hole portion 38b of the magnet hole 38 has at least one third projection 38ba, but the present invention is not limited to this. The inner wall of the second hole portion 38b may not have the third protrusion 38ba.

Moreover, in the above-described embodiment, as shown in FIG. 2, the example in which the set S of the three magnet holes 38 is arranged in a triangular shape when viewed from the axial direction was given, but the present invention is not limited to this. That is, the number, arrangement, etc. of the magnet holes 38 included in the set S are not limited to the above-described embodiment. For example, the set S may have the first magnet hole 38A and not the second magnet holes 38B and 38C. Alternatively, the set S may have the second magnet holes 38B and 38C and not the first magnet hole 38A. Further, the set S may have a configuration in which a plurality of first magnet holes 38A are arranged side by side in the radial direction. Alternatively, the set S may have a configuration in which a plurality of second magnet holes 38B and 38C are arranged side by side in the radial direction.

Moreover, the coolant circulating in the coolant flow path 90 is not limited to the oil O. The coolant may be, for example, an insulating liquid or water. When the coolant is water, the surface of the stator 40 may be subjected to insulation treatment.

A rotating electric machine to which the present invention is applied is not limited to a motor, and may be a generator. Applications of the rotating electric machine are not particularly limited. For example, the rotating electric machine may be mounted on a vehicle for a purpose other than for rotating the axle 64, or may be mounted on a device other than the vehicle. In addition, there are no particular restrictions on the orientation of the rotating electric machine when it is used.

The configurations described in the above-described embodiments and modifications may be combined without departing from the gist of the present invention, and addition, omission, replacement, and other modifications of the configuration are possible. Moreover, the present invention is not limited by the above-described embodiments and the like, but is limited only by the scope of the claims.

DESCRIPTION OF SYMBOLS 10... Rotary electric machine 30... Rotor 31... Shaft 32... Rotor core 36... Magnet 36a... First surface 36b... Second surface 36c... Corner part 37... Interposed part 37A... Foam sheet 37B... Resin 38 Magnet hole 38a First hole 38aa First projection 38ab Second projection 38ac Recess 38b Second hole 38c Opposing wall surface 38e Flux barrier 38ea Second 1 flux barrier section 38eb second flux barrier section 40 stator 60 transmission device 80 lamination 95a shaft flow path 95d flux barrier flow path 95e flow path between first projections 95f Flow path between second protrusions 100 Drive device D1 First direction D2 Second direction G Gap J Central axis

Claims (18)

an annular rotor core centered on the central axis;
magnets arranged in magnet holes extending in the axial direction of the rotor core;
an intervening portion interposed between the inner wall of the magnet hole and the magnet,
The outer surface of the magnet is
a first surface extending in a first direction when viewed from the axial direction;
a second surface extending in a second direction perpendicular to the first direction when viewed from the axial direction;
The magnet hole is
a plurality of first holes provided along the axial direction;
a second hole disposed between the first holes adjacent in the axial direction and communicating with the first holes;
The inner wall of the first hole is
a first protrusion facing the first surface;
a second protrusion facing the second surface;
gaps are provided between the first projections arranged in the axial direction and between the second projections arranged in the axial direction, respectively, so that a part of the intervening portion can be arranged;
rotor. The rotor core has a plurality of laminations stacked in the axial direction,
each of the first hole and the second hole is a hole axially penetrating the lamination,
A rotor according to claim 1 . The plurality of laminations have the same shape as each other,
Each said lamination comprises:
the first hole;
and the second hole different in position in the circumferential direction from the first hole,
the first hole of one of the laminations and the second hole of the other of the laminations axially aligned with the one of the laminations overlap when viewed in the axial direction;
3. A rotor according to claim 2. A plurality of the first projections are provided on the inner wall of the first hole at intervals in the second direction,
The magnet is arranged between two adjacent first projections in the second direction,
A rotor according to any one of claims 1 to 3. an inner wall of the magnet hole extending in the second direction when viewed from the axial direction and having a facing wall surface facing the second surface in the first direction;
The intervening portion has a foam sheet,
The foam sheet is interposed between the opposing wall surface and the second surface,
A plurality of the second projections are provided on the inner wall of the first hole portion at intervals in the second direction,
A part of the foam sheet is arranged between two of the second projections adjacent to each other in the second direction,
A rotor according to any one of claims 1 to 4. The intervening portion has a foam sheet or resin,
A part of the foam sheet or a part of the resin is arranged in a gap between the first projections arranged in the axial direction,
A rotor according to any one of claims 1 to 5. The intervening portion has a foam sheet or resin,
A part of the foam sheet or a part of the resin is arranged in the gap between the second projections arranged in the axial direction.
A rotor according to any one of claims 1 to 6. the outer surface of the magnet has a pair of second surfaces facing opposite sides in the first direction;
A plurality of the second projections are provided on the inner wall of the first hole so as to face each of the second surfaces,
A plurality of the first projections are provided on the inner wall of the first hole side by side in the first direction,
A rotor according to any one of claims 1 to 7. the outer surface of the magnet has a corner where the first surface and the second surface are connected,
The inner wall of the first hole has a recess disposed between the first projection and the second projection,
The recess faces the corner,
A rotor according to any one of claims 1 to 8. A gap is provided between the second surface and the second projection,
A rotor according to any one of claims 1 to 9. the magnet hole has a flux barrier arranged adjacent to the magnet in the second direction;
The flux barrier is
a first flux barrier portion disposed in the first hole;
a second flux barrier portion communicating with the first flux barrier portion and disposed in the second hole;
The intervening portion has a resin,
Part of the resin is arranged in each of the first flux barrier section and the second flux barrier section,
A rotor according to any one of claims 1 to 10. the magnet hole has a flux barrier arranged adjacent to the magnet in the second direction;
an inner wall of the magnet hole extending in the second direction when viewed from the axial direction and having a facing wall surface facing the second surface in the first direction;
The intervening portion is
a foam sheet interposed between the facing wall surface and the second surface;
a resin at least partially disposed on the flux barrier;
A rotor according to any one of claims 1 to 11. a shaft extending axially and fixed to the rotor core;
a flow path arranged over at least the shaft and the rotor core,
the magnet hole has a flux barrier arranged adjacent to the magnet in the second direction;
The flow path is
a shaft channel disposed within the shaft;
a flux barrier channel connected to the shaft channel and disposed within the flux barrier;
A rotor according to any one of claims 1 to 12. The flow path is
a first protrusion-to-protrusion channel arranged in a gap between the first protrusions arranged in the axial direction;
a flow path between second projections arranged in a gap between the second projections arranged in the axial direction;
the flux barrier channel, the first inter-protrusion channel, and the second inter-protrusion channel communicate with each other;
14. A rotor according to claim 13. the magnet extends in the second direction when viewed from the axial direction;
The second direction is a direction perpendicular to the radial direction,
A rotor according to any one of claims 1 to 14. the magnet extends in the second direction when viewed from the axial direction;
The second direction is a direction extending radially outward in the circumferential direction.
A rotor according to any one of claims 1 to 14. a rotor according to any one of claims 1 to 16;
a stator arranged radially outside the rotor;
rotating electric machine. a rotary electric machine according to claim 17;
a transmission device connected to the rotor;
drive.

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