DE102022209658A1 - ROTOR, ELECTRIC LATHE AND DRIVE DEVICE - Google Patents

Abstract

An aspect of a rotor of the present invention has a rotor core having an annular shape around a central axis, a magnet inserted in a magnet hole extending in an axial direction of the rotor core, and an insertion portion interposed between an inner wall of the magnet hole and the magnet is inserted, on. An outer surface of the magnet has a first surface extending in a first direction as viewed in the axial direction and a second surface extending in a second direction as viewed in the axial direction that is perpendicular to the first direction , extends. The magnet hole includes a plurality of first holes provided along the axial direction and a second hole communicating between the first holes adjacent to each other in the axial direction and communicating with the first holes. An inner wall of the first hole has first protrusions facing the first surface and second protrusions facing the second surface. Spaces in which a part of the insertion portion can be arranged are provided between the first protrusions juxtaposed in the axial direction and the second protrusions juxtaposed in the axial direction.

Description

field of invention

The present invention relates to a rotor, a rotary electric machine and a driving device.

background technique

In a related art, some rotors have a rotor core, a magnet disposed within a slot of the rotor core, and a resin filled between an inner peripheral surface of the slot and a side surface of the magnet, see, for example, US Pat JP 4143631 . Furthermore, some rotors are known which have a rotor core, a permanent magnet inserted in a hole of the rotor core, and an adhesive layer interposed between the hole and the permanent magnet, see for example US Pat JP 2006-311782 A

Summary of the Invention

Problems to be solved by the invention

This type of rotor is required to stably hold a magnet in a state where it is positioned in the magnet hole of the rotor core. Moreover, regardless of a case where the magnet is held by the resin or a case where the magnet is held by a foam board, there is room for improvement in that components of the rotor core are molded to facilitate manufacture , and that magnetic characteristics of the rotor are stabilized.

An object of the present invention is to provide a rotor, a rotary electric machine and a drive device that can facilitate manufacture by sharing constituent parts of a rotor core and improve the magnetic characteristics of the rotor regardless of a type of an insertion portion that has a magnet in a Magnetic hole holds, can stabilize.

means of solving the problems

The present invention provides a rotor according to claim 1, a rotary electric machine according to claim 17 and a drive device according to claim 18. Further developments of the invention are set out in the dependent claims.

An aspect of a rotor of the present invention includes a rotor core having an annular shape around a central axis, a magnet disposed in a magnet hole extending in an axial direction of the rotor core, and an insertion portion sandwiched between an inner wall of the magnet hole and the magnet is inserted on. An outer surface of the magnet has a first surface extending in a first direction when viewed in the axial direction and a second surface extending in a second direction perpendicular to the first direction when viewed in the axial direction . The magnet hole includes a plurality of first holes provided along the axial direction and a second hole that is located between the first holes that are adjacent to each other in the axial direction and communicates with the first hole. An inner wall of the first hole has first protrusions facing the first surface and second protrusions facing the second surface. Spaces in which a part of the insertion portion can be arranged are provided between the first protrusions juxtaposed in the axial direction and the second protrusions juxtaposed in the axial direction.

An aspect of a rotary electric machine of the present invention includes the rotor described above and a stator disposed on a radially outer side of the rotor.

An aspect of a driving device of the present invention includes the rotary electric machine described above and a transmission device connected to the rotor.

effect of the invention

According to the rotor, the rotary electric machine and the driving device of the above aspect of the present invention, regardless of the type of the insertion portion that holds the magnet in the magnet hole, the components of the rotor core can be shared to facilitate manufacture, and the magnetic characteristics of the Rotors can be stabilized.

character list

• 1 12 is a schematic diagram showing a schematic structure of a drive device according to the present embodiment.
• 2 Fig. 12 is a front view showing part of a rotor.
• 3 12 is a perspective view showing part of a rotor core.
• 4 12 is a front view (plan view) of one of a plurality of layers of the rotor core viewed in an axial direction.
• 5 12 is an enlarged front view showing part of the rotor in FIG 2 shows.
• 6 Fig. 12 is a side view showing a foam board.
• 7 Fig. 14 is a perspective view showing the foam board.
• 8th Fig. 14 is a perspective view for describing a method of attaching the foam sheet to a magnet.
• 9 12 is a front view showing part of a rotor of a first modification of the present embodiment.
• 10 12 is an enlarged front view showing part of a rotor of a second modification of the present embodiment.
• 11 13 is an enlarged front view showing part of a rotor of a third modification of the present embodiment.
• 12 14 is an enlarged front view showing part of a rotor according to a fourth modification of the present embodiment.
• 13 14 is a cross-sectional view showing a rotor of a fifth modification of the present embodiment.

Embodiments for carrying out the invention

In the following description, a vertical direction is defined based on positional relationships in a case where a driving device according to an embodiment is installed in a vehicle positioned on a horizontal road surface. That is, it is sufficient that the relative positional relationships with respect to the vertical direction described in the present embodiment are satisfied at least in the case where the driving device is installed in the vehicle positioned on the horizontal road surface .

in the drawings, an XYZ coordinate system is approximately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, a Z-axis direction corresponds to the vertical direction. A +Z side is an upper side in the vertical direction, and a -Z direction side is a lower side in the vertical direction. In the following description, the upper side and the lower side in the vertical direction are simply referred to as the "upper side" and "lower side", respectively. An X-axis direction is orthogonal to the Z-axis direction and corresponds to a front-rear direction of the vehicle on which the driving device is mounted. In the following embodiment, a +X side is a front of the vehicle and a -X side is a rear of the vehicle. A Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction, and is a left-right direction of the vehicle, that is, a vehicle width direction. In the following embodiment, a +Y side corresponds to a left side of the vehicle, and a -Y side corresponds to a right side of the vehicle. Each of the front-back direction and the left-right direction is a horizontal direction perpendicular to the vertical direction.

Note that the positional relationship in the front-rear direction is not limited to the positional relationship in the following embodiment, wherein the +X side may be the rear of the vehicle and the -X side may be the front of the vehicle. In this case, the +Y side corresponds to the right side of the vehicle and the -Y side corresponds to the left side of the vehicle. Further, in the present specification, a “parallel direction” includes a substantially parallel direction, and an “orthogonal direction” includes a substantially orthogonal direction.

A central axis J illustrated in the drawings as appropriate is a virtual axis extending in a direction intersecting the vertical direction. More specifically, the center axis J extends in the Y-axis direction orthogonal to the vertical direction, that is, in the left-right direction of the vehicle. In the following description, unless otherwise specifically stated, a direction parallel to the center axis J is simply referred to as an "axial direction", a radial direction around the center axis J is simply referred to as a "radial direction", and a circumferential direction around the center axis J, that is, a direction around the center axis is simply referred to as a “circumferential direction”. The left side (+Y side) in the axial direction is referred to as an “axial first side”, and the right side (−Y side) in the axial direction is referred to as an “axial second side”.

An arrow θ appropriately illustrated in the drawings indicates the circumferential direction. In the following description, a side that is further counterclockwise about the central axis J as viewed from the left side in the circumferential direction, that is, a side (+0 side) to which the arrow θ points, is referred to as one referred to as "first peripheral page", while a side further clockwise around the central axis J as viewed from the left side in the circumferential direction, that is, a side (-θ side) opposite to the side to which the arrow θ points, as a " second peripheral side” is referred to.

The drive device 100 according to the present embodiment, which is shown in 1 is shown is attached to a vehicle having a motor as a power source, such as a hybrid electric vehicle (HEV), a plug-in hybrid vehicle (PHV vehicle), and an electric vehicle (EV), and is used as the Power source of the same used. That is, the driving device 100 rotates an axle 64 of the vehicle.

The drive device 100 has an electric rotating machine 10 and a transmission device 60 . The transmission device 60 is connected to a rotor 30 of the rotary machine 10, which will be described later, and transmits rotation of the rotor 30, that is, rotation of the rotary electric machine 10 to the axle 64 of the vehicle. The transmission device 60 of the present embodiment includes a gear case 61, a speed reducer 62 connected to the rotor 30, and a differential gear 63 connected to the speed reducer 62. As shown in FIG.

The gear case 61 accommodates the speed reducer 62, the differential gear 63 and oil O internally. The oil O is stored in a lower region in the transmission case 61 . The oil O circulates in a coolant flow path 90 to be described later. The oil is used as a coolant to cool the rotary electric machine 10 . Further, the oil O is used as a lubricating oil for the speed reducer 62 and the differential gear 63 . As the oil O, for example, oil equivalent to an automatic transmission fluid (ATF) having a relatively low viscosity is preferably used to function as the coolant and the lubricating oil.

The differential gear 63 has a ring gear 63a. The ring gear 63a receives torque output from the rotary electric machine 10 and transmitted through the speed reducer 62 . The ring gear 63a has a lower end portion immersed in the oil O stored in the gear case 61 . The ring gear 63a rotates, and thus the oil O is scraped. The scraped oil O is supplied to, for example, the speed reducer 62 and the differential gear 63 as the lubricating oil.

The rotary electric machine 10 is a portion that drives the drive device 100 . The rotary electric machine 10 is positioned, for example, on the second axial side of the transmission device 60 . In the present embodiment, the rotary electric machine 10 is a motor. The rotary electric machine 10 includes a motor housing 20, the rotor 30 rotatable about the central axis J, a stator 40, and a coolant supply part 50. As shown in FIG.

The motor case 20 internally houses the rotor 30 and the stator 40 . The motor housing 20 is connected to the transmission housing 61 on the second axial side. The motor housing 20 has a peripheral wall 21, a partition wall 22 and a cover 23. FIG. In the present embodiment, the peripheral wall 21 and the partition wall 22 are integrally formed. The lid 23 is separate from the peripheral wall 21 and the partition wall 22.

The peripheral wall 21 has a cylindrical shape surrounding the central axis J and is open to the second axial side. The partition wall 22 is connected to an end portion of the peripheral wall 21 on the first axial side. The partition wall 22 partitions the inside of the motor case 20 and the inside of the transmission case 61 in the axial direction. The bulkhead 22 has a bulkhead opening 22a that allows the interior of the motor case 20 to communicate with the interior of the gear case 61 . The partition wall 22 supports a bearing 34. The cover is fixed to an end portion of the peripheral wall 21 on the second axial side 23. As shown in FIG. The lid 23 closes an opening of the peripheral wall 21 on the second axial side. The cover 23 holds a bearing 35.

As in the 1 and 2 As shown, the rotor 30 includes rotor cores 32 having an annular shape about the central axis J, magnets 36, insertion portions 37, and a shaft 31. As shown in FIG.

As in 1 1, the shaft 31 extends in the axial direction and is fixed to the rotor core 32. As shown in FIG. More specifically, an outer peripheral surface of the shaft 31 and an inner peripheral surface of a center hole 32a of the rotor core 32, which will be described later, are fixed to each other. The shaft 31 is rotatable about the central axis J. The shaft 31 is rotatably supported by the bearings 34 and 35 . In the present embodiment, the shaft 31 is a hollow shaft. The shaft 31 has a cylindrical shape around the central axis J. FIG. The shaft 31 is provided with a hole 33 that allows the inside of the shaft 31 to communicate with the outside of the shaft 31 . The shaft 31 extends across the interior of the motor case 20 and the interior of the gear case 61. The shaft 31 has an end portion on the first axial side protruding into the gear case 61 stands. The speed reducer 62 is connected to the end portion of the shaft 31 on the first axial side.

The rotor core 32 has a substantially cylindrical shape around the central axis J. As shown in FIG. The rotor core 32 has the center hole 32a penetrating the rotor core 32 in the axial direction. The center hole 32a has the shape of a substantially circular hole around the center axis J. As shown in FIG. The shaft 31 passes through the center hole 32a in the axial direction. The inner peripheral surface of the center hole 32a is fixed to the outer peripheral surface of the shaft 31 .

The rotor core 32 is formed of a magnetic body. As in 3 As shown, the rotor core 32 has a plurality of sheets (laminations) 80 laminated in the axial direction. The layer 80 is a plate-shaped member. A plate surface of sheet 80 faces the axial direction. 4 12 is a front view (plan view) of one of the plurality of layers 80 of the rotor core 32 viewed in the axial direction. As in 4 As shown, sheet 80 has a generally annular plate shape about central axis J . The sheet 80 is, for example, an electromagnetic steel sheet.

As in the 2 and 4 As shown, the rotor core 32 has a plurality of magnet holes 38 . Each of the magnet holes 38 is located in a different portion of the rotor core 32 than the center hole 32a. More specifically, the respective magnet holes 38 are arranged on a radially outer side of the center hole 32 in the circumferential direction at intervals in the axial direction. Each of the magnet holes 38 penetrates the rotor core 32 in the axial direction. That is, the magnet hole 38 extends in the axial direction. As in 2 As shown, the magnet 36 is positioned in each of the magnet holes 38 . That is, a plurality of the magnets 36 are provided. One of the magnets 36 is placed in each of the magnet holes 38 . A type of the magnet 36 is not particularly limited. The magnet 36 can be a neodymium magnet or a ferrite magnet, for example. As in 8th As shown, the magnet 36 has, for example, a rectangular parallelepiped shape that is elongated in the axial direction. The magnet 36 extends, for example, from one axial end portion to the other axial end portion of the rotor core 32. Note that an axial dimension of the magnet 36 may be shorter than an axial dimension of the rotor core 32 (an axial dimension of the magnet hole 38).

As in 2 1, the plurality of magnet holes 38 include a first magnet hole 38A extending in a direction perpendicular to the radial direction as viewed in the axial direction, and a pair of second magnet holes 38B and 38C extending in extend radially outward in the circumferential direction as viewed in the axial direction. Note that the first magnet hole 38A does not necessarily have to extend linearly 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. A second magnet hole 38B of the pair of second magnet holes 38B and 38C juxtaposed in the circumferential direction extends radially outward toward the first circumferential side (+0 side) when viewed in the axial direction. The other second magnet hole 38C of the pair of second magnet holes 38B and 38C juxtaposed in the circumferential direction extends radially outward toward the second circumferential side (-θ side) as viewed in the axial direction. That is, a distance between the pair of second magnet holes 38B and 38C gradually increases radially outward in the circumferential direction. The first magnet hole 38A is located between radially outer end portions of the pair of second magnet holes 38B and 38C in the circumferential direction.

In the present embodiment, a set S of magnet holes 38 including the one first magnet hole 38A and the pair of second magnet holes 38B and 38C are arranged in a triangular shape as viewed in the axial direction, as shown in FIG 2 is shown. That is, the one first magnet hole 38A and the two second magnet holes 38B and 38C included in the one set S are arranged to form three sides of a substantially triangular shape as viewed in the axial direction. A plurality of the sets S of the magnet holes 38 are provided in the rotor core 32 side by side in the circumferential direction (see FIG 4 ). In the present embodiment, eight sets S of the magnet holes 38 are provided at equal intervals in the circumferential direction. It should be noted that the set S may be renamed to a magnet hole arrangement configured by an aggregation of the plurality of magnet holes 38, a magnet holding region which is a region holding the magnets viewed in the axial direction, or the like.

In the present embodiment, the magnet 36 arranged in the first magnet hole 38A is magnetized in the radial direction. That is, a location on a radially outer side of the magnet 36 included in the first magnet hole 38A is an N pole (or an S pole). A radially inner side of the magnet 36 disposed in the first magnet hole 38A is a magnetic pole (ie, an S pole (or N pole)) different from the radially outer magnetic pole.

Similarly, in the present embodiment, the magnets 36 disposed in the pair of second magnet holes 38B and 38C are magnetized in directions perpendicular to the longitudinal direction of the magnet 36 as viewed in the axial direction. That is, a position on the second peripheral side of the magnet 36 placed in a second magnet hole 38B is an N pole (or an S pole). A position on the first peripheral side of the magnet 36 disposed in the second magnet hole 38B is a magnetic pole (ie, an S pole (or N pole)) different from the magnetic pole on the second peripheral side.

A position on the first peripheral side of the magnet 36 arranged in the other second magnet hole 38C is an N pole (or an S pole). A location on the second peripheral side of the magnet 36 disposed in the second magnet hole 38C is a magnetic pole (ie, an S pole (or an N pole)) different from the magnetic pole on the first peripheral side.

As in 2 As shown, the first magnet hole 38A and the second magnet holes 38B and 38C have a common configuration. Hereinafter, the configuration common to the first magnet hole 38A and the second magnet holes 38B and 38C is explained with reference to FIG 2 until 5 described. It should be noted that 5 Fig. 12 is an enlarged front view showing part of the rotor 30 in Fig 2 shows.

In the present embodiment, as in 2 As shown, for each of the magnet holes 38 viewed in the axial direction, a direction parallel to a direction of magnetization of the magnet 36 is referred to as a first direction D1 and a direction perpendicular to the direction of magnetization is referred to as a second direction D2. Each magnet hole 38 extends in the second direction D2 as viewed in the axial direction. In addition, the magnet 36 disposed in each magnet hole 38 also extends in the second direction D2 as viewed in the axial direction. In the case of the first magnetic 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 in the circumferential direction. That is, in the case of the second magnet hole 38B, the second direction D2 is a direction extending radially outward toward the first peripheral side, as in FIG 2 is shown. As in 2 1, in the case of the second magnet hole 38C, the second direction D2 is a direction extending radially outward toward the second peripheral side.

An outer surface of the magnet 36 has first surfaces 36a extending in the first direction D1 when viewed in the axial direction, second surfaces 36b extending in the second direction D2, which is perpendicular to the first direction D1, when viewed in the axial direction , extend, and corners 36c where the first surface 36a and the second surface 36b connect.

A pair of first surfaces 36a are provided on the outer surface of the magnet 36 . On the outer surface of the magnet, the pair of first surfaces 36a of the magnet 36 are positioned spaced from each other in the second direction D2. The pair of first surfaces 36a faces sides in the second direction D2 that are opposite to each other. A pair of second surfaces 36 b are provided on the outer 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 spaced in the first direction D1. The pair of second surfaces 36b faces sides in the first direction D1 that are opposite to each other. The corners 36c are located at corners of the outer surface of the magnet 36 as viewed in the axial direction. Four corners 36c are provided on the outer surface of the magnet 36. FIG.

An inner wall of the magnet hole 38 has a facing wall surface 38c extending in the second direction D2 when viewed in the axial direction and facing (opposite) the second surface 36b in the first direction D1. The facing wall surface 38c is a surface facing the first direction D. FIG. The facing wall surface 38c extends in the direction perpendicular to the first direction D1. A pair of facing wall surfaces 38c are provided on the inner wall of the magnet hole 38 . On the inner wall of the magnet hole 38, the pair of facing wall surfaces 38c are positioned spaced apart in the first direction D1. The pair of facing wall surfaces 38c is arranged to face each other in the first direction D1.

In the present embodiment, as in 2 As shown, one facing wall surface 38c of the pair of facing wall surfaces 38c of each magnet hole 38 positioned on the radially inner side faces at least the radially outer side. The one delivered facing wall surface 38c faces a second surface 36b of the pair of second surfaces 36b of the magnet 36 positioned on the radially inner side.

The other facing wall surface 38c of the pair of facing wall surfaces 38c of each magnet hole 38 positioned on the radially outer side faces at least the radially inner side. The other facing wall surface 38c faces the other second surface 36b of the pair of second surfaces 36b of the magnet 36 positioned on the radially outer side.

As in 3 As shown, the magnet hole 38 has a plurality of first holes 38a provided along the axial direction and second holes 38b each located between the first holes 38a adjacent to each other in the axial direction and having the first holes 38a communicate. Also in the first embodiment, a plurality of second holes 38b are provided along the axial direction. The first hole 38a and the second hole 38b overlap each other as viewed in the axial direction. The first hole 38a and the second hole 38b are alternately arranged along the axial direction. Each of the first hole 38a and the second hole 38b is a hole penetrating the sheet 80 in the axial direction. According to the present embodiment, the first hole 38a and the second hole 38b of the magnet hole 38 can be arranged side by side in the axial direction by laminating the plurality of sheets 80 in the axial direction. Consequently, the rotor 30 can be easily manufactured.

As in the 2 , 3 and 5 As shown, the inner wall of the first hole 38a has first projections 38aa facing the first surfaces 36a, second projections 38ab facing the second surfaces 36b, and recesses 38ac, each between the first projection 38aa and the second projection 38ab are arranged on.

At least one first protrusion 38aa is provided on the inner wall of the first hole 38a. In the present embodiment, a plurality of first projections 38aa are provided on the inner wall of the first hole 38a at intervals in the second direction D2. More specifically, a pair of first projections 38aa may be provided on the inner wall of the first hole 38a. The first projection 38aa projects from the facing wall surface 38c. More specifically, in the present embodiment, the first protrusion 38aa projects from a facing wall surface 38c of the pair of facing wall surfaces 38c of the magnet hole 38 positioned on the radially inner side.

The first protrusion 38aa faces the first surface 36a of the magnet 36 in the second direction D2. It should be noted that the first protrusion 38aa may be in contact with the first surface 36a or may face the first surface with a gap. According to the present embodiment, since the first protrusion 38aa faces the first surface 36a of the magnet 36, the magnet 36 is positioned in the second direction D2 in the magnet hole 38, and movement of the magnet 36 in the second direction D2 is prevented when the Magnet 36 is held by the inserting portion 37 such as a foam board 37A or a resin 37B to be described later.

As in 2 1, in the present embodiment, the pair of first protrusions 38aa faces the pair of first surfaces 36a. More specifically, the first protrusion 38aa positioned on one side in the second direction D2 faces the first surface 36a of the magnet 36 positioned on one side in the second direction D2. The first projection 38aa positioned on the other side in the second direction D2 faces the first surface 36a of the magnet 36 positioned on the other side in the second direction D2. That is, the magnet 36 is arranged in the second direction D2 between two first projections 38aa adjacent to each other. According to the present embodiment, the magnet 36 can be pressed on both sides in the second direction D2 by the plurality of first protrusions 38aa. It is thus possible to more stably position the magnet 36 in the second direction D2 with respect to the magnet hole 38 .

As in 3 1, the plurality of first projections 38aa are provided on the inner wall of the magnet hole 38 along the axial direction. A space is provided between the first projections 38aa juxtaposed in the axial direction. In the present embodiment, rows of the first projections 38aa formed by arranging the plurality of first projections 38aa side by side in the axial direction are at an end portion of the magnet hole 38 on one side in the second direction D2 and an end portion on the other side provided in the second direction D2.

As in the 2 , 3 and 5 is shown, at least a second projection 38ab on the inner wall of the first hole 38a is provided. In the present embodiment, a plurality of second projections 38ab are provided on the inner wall of the first hole 38a at intervals in the second direction D2. More specifically, a pair of second projections 38ab are provided on the inner wall of the first hole 38a. The second projections 38ab project from the facing wall surface 38c. More specifically, in the present embodiment, the second projections 38ab protrude from a facing wall surface 38c of the pair of facing wall surfaces 38c of the magnet hole 38 positioned on the radially inner side.

A dimension of the second projection 38ab projecting from the facing wall surface 38c in the first direction D1 is smaller than a dimension of the first projection 38aa projecting from the facing wall surface 38c in the first direction D1. The second projection 38ab is located between two first projections 38aa adjacent to each other in the second direction D2.

The second projection 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 in the magnet hole 38 by the second projection 38ab, and the magnet 36 is prevented from moving in the first direction D1 when the magnet 36 is held by the insertion portion 37 .

As in 2 1, in the present embodiment, the pair of second projections 38ab of the first hole 38a faces a second surface 36b of the pair of second surfaces 36b of the magnet, which is positioned on the radially inner side. More specifically, the second protrusion 38ab positioned on the one side in the second direction D2 faces an end portion of the one second surface 36b on the one side in the second direction D2. The second protrusion 38ab positioned on the other side in the second direction D2 faces an end portion of the one second surface 36b on the other side in the second direction D2.

As in 5 1, in the present embodiment, a gap G is provided between the second surface 36b and the second projection 38ab. The gap G is provided between the second surface 36b and the second protrusion 38ab so that a clearance is provided in the first direction D1 when the magnet 36 is inserted into the magnet hole 38 . Consequently, the magnet 36 can be stably inserted into the magnet hole 38 without overly strict dimensional accuracy of the magnet 36 in the first direction D1, and the cost of the magnet 36 can be reduced. Note that the present invention is not limited thereto, and the second protrusion 38ab may be in contact with the second surface 36b.

As in 3 1, a plurality of second projections 38ab are provided on the inner wall of the magnet hole 38 along the axial direction. A space is provided between the second projections 38ab juxtaposed in the axial direction. In the present embodiment, rows of the second protrusions 38ab formed by arranging the plurality of second protrusions 38ab side by side in the axial direction are at an end portion of the magnet hole 38 on one side in the second direction D2 and an end portion on the other side provided in the second direction D2.

As in 5 As shown, a recess 38ac is located between the first projection 38aa and the second projection 38ab in the second direction D2. The recess 38ac has a recessed shape recessed from 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 the present embodiment, as in 2 1, a plurality of recesses 38ac are provided on the inner wall of the first hole 38a at intervals in the second direction D2. More specifically, a pair of recesses 38ac are provided on the inner wall of the first hole 38a.

The recess 38ac faces the corner 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 facing the one facing wall surface 38c and the one recess 38ac face each other. As in 5 As shown, the recess 38ac is spaced 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, thus preventing the corner 36c from coming into contact with the inner wall of the first hole 38a. The corner 36c of the magnet 36 is prevented from being broken off.

As in 2 , 3 and 5 As shown, an inner wall of the second hole 38b has third projections 38ba. At least a third portion 38ba is on the inner wall of the second hole 38b provided. The third projection 38ba projects from the facing wall surface 38c. More specifically, in the present embodiment, the third projection 38ba projects from a facing wall surface 38c of the pair of facing wall surfaces 38c of the magnet hole 38 that is positioned on the radially inner side.

The third projection 38ba faces the first surface 36a of the magnet 36 at a distance in the second direction D2. That is, the third protrusion 38ba is spaced apart from the first surface 36a in the second direction D2.

As in 2 1, the number and arrangement of the third projections 38ba provided in the second hole 38b differs between the case of the first magnetic hole 38A, the case of the second magnetic hole 38B and the case of the second magnetic hole 38C.

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

The pair of third projections 38ba faces the pair of first surfaces 36a of the magnet 36 at intervals. More specifically, the third protrusion 38ba positioned on one side in the second direction D2 faces the first surface 36a of the magnet 36 positioned on one side in the second direction D2 at a distance in the second direction D2 . The third protrusion 38ba positioned on the other side in the second direction D2 faces the first surface 36a of the magnet 36 positioned on the other side in the second direction D2 at a distance in the second direction D2.

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

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

As in the 2 and 5 1, the insertion portion 37 is inserted between the inner wall of the magnet hole 38 and the magnet 36. As shown in FIG. The insertion portion 37 is provided in each magnet hole 38 . That is, a plurality of insertion portions 37 are provided. In the present embodiment, the inserting portion 37 has the foam board 37A. At least one foam sheet 37A is provided between the inner wall of the magnet hole 38 and the magnet 36 . The foam board 37A is interposed between the facing wall surface 38c and the second surface 36b. More specifically, in the present embodiment, the foam sheet 37A is interposed between the one facing wall surface 38c of the magnet hole 38 positioned on the radially inner side and the one second surface 36b of the magnet 36 positioned on the radially inner side.

Since the foam sheet 37A, which is expanded by heat, during manufacture of the rotor pushes the magnet 36 at least radially outward as indicated by each arrow in FIG 2 1, in the present embodiment, the other second surface 36b of the magnet 36 positioned on the radially outer side is pressed against the other facing wall surface 38c of the magnet hole 38 positioned on the radially outer side. The foam sheet 37A is cured in this state, thus maintaining a state in which the other second surface 36b of the magnet 36 and the other facing wall surface 38c of the magnet hole 38 are in close contact with each other. Consequently, the magnet 36 is prevented from being displaced radially outward in the magnet hole 38 even when a centrifugal force acts on the magnet 36 during rotation of the rotor 30 . Consequently, it is possible to change the magnetic character ristika caused by displacement, chattering or the like of the magnet 36 to prevent.

As in 2 1, in each magnet hole 38, a part of the foam sheet 37A is sandwiched between two second projections 38ab which are adjacent to each other in the second direction D2. Thus, according to the present embodiment, the foam sheet 37A can be pressed on both sides in the second direction D2 by the plurality of second protrusions 38ab. It is thus possible to position the foam board 37A stably in the second direction D2 with respect to the magnet hole 38.

More specifically, as in 8th As shown, the foam sheet 37A is a sheet-like member and is inserted into the magnet hole 38 together with the magnet in a state of being attached to the outer surface of the magnet 36 . In the present embodiment, the foam board 37A is a rectangular or quadrangular board extending in the axial direction. However, the present invention is not limited to this, and the foam sheet 37A may be a sheet having a polygonal shape other than the quadrangular shape, an elliptical shape, or a circular shape, for example. The foam sheet 37A placed in the magnet hole 38 is expanded in volume due to foaming by heating, and is cured in the expanded state. The expanded foam board 37A presses the magnet 36 toward the inner wall of the magnet hole 38 . Consequently, the foam sheet 37A holds the magnet 36 in the magnet hole 38.

As in 6 As shown, the foam sheet 37A is formed by laminating a plurality of layers. In the present embodiment, the foam board 37A comprises a base material layer 37a, a pair of foam adhesive layers 37b and 37c, and a release liner 37e.

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

Each of the pair of foam adhesive layers 37b and 37c contains, for example, a thermosetting resin and a foaming agent foamable by heating. The foaming agent is preferably, for example, one that foams at a temperature lower than a curing temperature of the thermosetting resin and reaches a most expanded state (maximum foamed state). Consequently, the hardening of the thermosetting resin is started after the foaming of the foaming agent is completed in the process of raising the temperature when the roter is heated, thus the foam sheet 37A is stably expanded, and the magnet 36 can stably attach through the foam sheet 37A to the inner wall of the magnet hole 38.

As the foaming agent, a microcapsule containing an organic solvent having a low melting point such as alcohol or the like can be used. In addition, the curable resin is preferably formed of a curable adhesive. Examples of the curable adhesive include a phenol-based adhesive, a urethane-based adhesive, and an epoxy-based adhesive. It should be noted that it is more preferable to use the epoxy-based adhesive than the thermosetting adhesive because of excellent quality in terms of adhesive strength, chemical resistance and the like.

Of the pair of foam adhesive layers 37a and 37c, one foam adhesive layer 37b is arranged on one surface (e.g., a front surface) of the base material layer 37a, and the other foam adhesive layer 37c is arranged on the other surface (e.g., a rear surface) of the base material layer 37a. The other foam adhesive layer 37c has an adhesive surface 37d on a surface facing the opposite side of the base material layer 37a in a thickness direction of the foam board 37A.

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

As in 3 and 5 1, in each magnet hole 38, a space in which a part of the insertion portion 37 can be arranged is between the first projections 38aa arranged side by side in the axial direction net, and between the second projections 38ab arranged side by side in the axial direction. In the present embodiment, as in 5 As shown, a part of the foam sheet 37A is placed in the space between the second projections 38ab juxtaposed in the axial direction. Specifically, in a case where the inserting portion 37 includes the foam sheet 37A, a part of the foam sheet 37A expanded by heating penetrates into the gap between the second projections 38ab juxtaposed in the axial direction and becomes during the manufacture of the rotor 30 hardened. Consequently, an anchor effect is obtained, preventing the foam sheet 37A from moving with respect to the magnet hole 38. Consequently, the magnet 36 can be stably held in a state where it is positioned in the magnet hole 38 . In addition, part of the foamed sheet 37A expanded by heating enters the space between the second projections 38ab, thus preventing the foamed sheet 37A from protruding toward an end surface of the rotor core 32 facing the axial direction. Consequently, for example, in a case where the plurality of rotor cores 32 are arranged in close contact with each other in the axial direction, or the like, it is possible to prevent the foam sheet 37A protruding from the end surface of the rotor core 32 and being hardened , close contact between the rotor cores 32 interferes.

In the present embodiment, the plurality of layers 80 included in the rotor core 32 have an identical shape. As in 4 As shown, each sheet 80 has the first hole 38a and the second hole 38b having a different position in the circumferential direction from the position of the first hole 38a. Specifically, the sheet 80 has at least a first region A1 extending along the circumferential direction and at least a second region A2 extending along the circumferential direction. The first region A1 and the second region A2 are arranged side by side in the circumferential direction. Specifically, the first region A1 and the second region A2 are alternately arranged in the circumferential direction. The first hole 38a is located in the first region A1 of the sheet 80. FIG. The second hole 38b is located in the second region A2 of the sheet 80. FIG. Specifically, the plurality of first holes 38a are provided in the first region A1. The plurality of second holes 38b are provided in the second region A2.

As in 4 1, a center angle α around the center axis J of the first region A1 and a center angle β around the center axis J of the second region A2 are equal when viewed in the axial direction. In the present embodiment, the central angles α and β are 180°. However, the present invention is not limited to this, and the central angles α and β may be 90°, for example. In this case, two first regions A1 and two second regions A2 are provided in layer 80. In addition, the central angles α and β can be 45°, for example. In this case, four first regions A1 and four second regions A2 are provided in layer 80. That is, the angles of the central angles α and β of the sheet 80 and the number of the first regions A1 and the second regions A2 are not limited to the example of the present embodiment.

As in 3 As shown, the plies 80 adjacent to each other in the axial direction are arranged to be shifted from each other by an angle of the central angle α(β) in the circumferential direction. Thus, the first region A1 of one ply 80 and the second region A2 of another ply 80 are arranged side by side in the axial direction, with the plies overlapping each other as viewed in the axial direction. More specifically, the first hole 38a of the one sheet 80 and the second hole 38b of the other sheet 80 overlap each other as viewed in the axial direction.

According to the present embodiment, the plies 80 are laminated in the axial direction while the positions of the plies 80 are shifted in the circumferential direction, that is, the plies 80 are laminated in a rotational manner. Consequently, it is possible to provide the magnet hole 38 in which the first hole 38a and the second hole 38b are arranged side by side in the axial direction while using the sheets having one type of components. Consequently, the rotor can be easily manufactured.

Although not specifically shown, it is noted that the plurality of tiers includes a first tier having the first hole 38a and not the second hole 38b and a second tier having the second hole 38b and not the first hole 38a. may have, wherein at least a first layer and at least a second layer may be arranged side by side in the axial direction. In this case, the first hole 38a of the first layer and the second hole 38b of the second layer are arranged to overlap each other as viewed in the axial direction, and consequently the magnet hole 38 in which the first hole 38a and the second hole 38b are in the axial direction are arranged side by side, can be provided.

Moreover, in the embodiment described above, the plies are laminated in the axial direction while the positions of the plies 80 are shifted in the circumferential direction. However, the plies 80 adjacent to each other in the axial direction need not be arranged to be shifted from each other in the circumferential direction. That is, a plurality of sheets 80 laminated in the axial direction in a state where the positions in the circumferential direction are equal can be arranged by being separated from at least one other sheet 80 by an angle of the central angle α ( or β) are shifted in the circumferential direction. In this case, with the plurality of sheets 80 laminated in the axial direction in a state where the positions in the circumferential direction are the same, the plurality of first holes 38a or the plurality of second holes 38b are adjacent to each other in arranged in the axial direction. Consequently, the plurality of first projections 38aa are adjacent to each other in the axial direction. The plurality of second projections 38ab are adjacent to each other in the axial direction. The plurality of recesses 38ac are adjacent to each other in the axial direction.

It should be noted that the plurality of layers may include a first layer having the first hole 38a and not having the second hole 38b, and a layer having the first hole 38a and the second hole 38b. The plurality of tiers may include a second tier having the second hole 38b and not having the first hole 38a, and a tier having the first hole 38a and the second hole 38b. The plurality of tiers may include the first tier, the second tier, and a tier having the first hole 38a and the second hole 38b.

As in the 2 and 5 As shown, the magnet hole 38 has flux barriers 38e. The flux barrier 38e is arranged adjacent to the magnet 36 in the second direction D2. In the present specification, the term “flux barrier” is a portion capable of preventing magnetic flux from flowing. That is, magnetic flux is less likely to pass through the flux barrier. The flux barrier is not particularly limited as long as the flow of magnetic flux can be prevented, and may have a void or a non-magnetic portion such as a resin portion. In the present embodiment, the flow barrier 38e is a void formed by a hole penetrating the rotor core 32 in the axial direction. In the present embodiment, a pair of flux barriers 38e are provided at both end portions of the magnet hole 38 in the second direction D2.

As in the 3 and 4 As shown, the flow barrier 38e has first flow barrier portions 38ea disposed in the first hole 38a and second flow barrier portions 38eb communicating with the first flow barrier portions 38ea and disposed in the second hole 38b. In the present embodiment, a pair of the first flow barrier portions 38ea are arranged at both end portions of the first hole 38a in the second direction D2. A pair of the second flow barrier portions 38eb are arranged at both end portions of the second hole 38b in the second direction D2. The first flow barrier portion 38ea and the second flow barrier portion 38eb overlap each other when viewed in the axial direction. The first flow barrier portion 38ea and the second flow barrier portion 38eb are alternately arranged along the axial direction. According to the present embodiment, the plurality of sheets 80 are laminated in the axial direction, therefore the first flow barrier portion 38ea and the second flow barrier portion 38eb of the flow barrier 38e can be arranged side by side in the axial direction.

As in 1 As shown, the stator 40 faces the rotor 30 with a gap therebetween in the radial direction. In more detail, the stator 40 is arranged on the radially outer side of the rotor 30 . The stator 40 is fixed inside the motor case 20 . The stator 40 has a stator core 41 and a 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 on the radially outer side of the rotor 30 . The stator core 41 surrounds the rotor 30. An outer peripheral surface of the stator core 41 has a portion in contact with an inner peripheral surface of the motor case 20. As shown in FIG. The stator core 41 is fixed to the motor case 20 by a fixing member such as a bolt (not shown).

The coil assembly 42 includes multiple coils 42c attached to the stator core 41 along the circumferential direction. The plurality of coils 42c are arranged on the stator core 41 with a member formed of an insulating material (not shown) interposed therebetween. The plurality of coils 42c are arranged along the circumferential direction. More specifically, the plurality of coils 42c are arranged at equal intervals over a circumference in the circumferential direction. Although not shown, it can the coil assembly 42 may include a binding member or the like to bind the respective coils 42c together and may include a via to connect the coils 42c to each other.

The coil assembly 42 has coil ends 42a and 42b protruding from the stator core 41 in the axial direction. The coil end 42a protrudes from the stator core 41 toward the first axial side. The coil end 42b protrudes from the stator core toward the second axial end. The coil end 42a has a portion of each of the coils 42c included in the coil assembly 42, the portion protruding from the stator core 41 toward the first axial side. The coil end 42b has a portion of each of the coils 42c included in the coil assembly 42, the portion protruding from the stator core 41 toward the second axial side. In the present embodiment, the appearance of the coil ends 42a and 42b has a substantially annular shape centered on the central axis J as viewed in the axial direction. Although not illustrated, each of the coil ends 42a and 42b may have a binding member or the like to bind the respective coils 42c together, or may have a through wire to connect the coils 42c to each other.

The coolant supply part 50 has a tubular shape extending in the axial direction. In the present embodiment, the coolant supply part 50 is a pipe that extends in the axial direction. The coolant supply part 50 has axially opposite end portions supported by the motor housing 20 . The coolant supply part 50 has the end portion on the first axial side supported by the partition wall 22, for example. The coolant supply part 50 has the end portion on the second axial side supported by the lid 23, for example. The coolant supply part 50 is positioned on a radially outer side of the stator 40 . In the present embodiment, the coolant supply part 50 is positioned above the stator 40 .

The coolant supply part 50 has supply ports 50a for supplying the oil O as a coolant to the stator 40 . In the present embodiment, the supply port 50a is an injection port that partially injects the oil O that has flowed into the coolant supply part 50 to the outside of the coolant supply part 50 . A plurality of supply ports 50a are provided in the coolant supply part 50 .

The driving device 100 in the present embodiment is provided with the coolant flow path 90 through which the oil O as the coolant circulates. The coolant flow path 90 is provided across the inside of the motor case 20 and the inside of the transmission case 61 . The coolant flow path 90 allows the oil O stored in the gear case 61 to be supplied to the rotary electric machine 10 and to return to the inside of the gear case 61 again. The coolant flow path 90 is provided with a pump 71 , a radiator 72 and the coolant supply part 50 . The coolant flow path 90 has a first flow path portion 91 , a second flow path portion 92 , a third flow path portion 93 , a fourth flow path portion 94 , and a fifth flow path portion 95 . In the present embodiment, the fifth flow path section 95 may be renamed as a “flow path”.

The first flow path portion 91, the second flow path portion 92, and the third flow path portion 93 are each provided in a wall of the transmission case 61, for example. The fourth flow path portion 94 is provided in the lid 23, for example. The first flow path portion 91 allows a portion that stores the oil O inside the transmission case 61 to communicate with the pump 71 . The second flow path portion 92 allows the pump 71 to communicate with the radiator 72 . The third flow path portion 93 allows the radiator 72 to communicate with the inside of the coolant supply part 50 . In the present embodiment, the third flow path portion 93 communicates with the end portion of the coolant supply part 50 on the first axial side. The fourth flow path portion 94 allows the inside of the coolant supply part 50 to communicate with the inside of the shaft 31 . In the present embodiment, the fourth flow path portion 94 communicates with the end portion of the coolant supply part 50 on the second axial side and an end portion of the shaft 31 on the second axial side.

The fifth flux path portion 95, that is, the flux path, is arranged across at least the inside of the shaft 31 and the inside of the rotor core 32. FIG. That is, the rotor 30 has the fifth flux path portion 95 which is the flux path. The flow path includes a ripple flow path 95a located in the shaft 31 and a flux barrier flow path 95d connected to the ripple flow path 95a and located in the flux barrier 38e. In the present embodiment, the shaft flow path 95a and the flow barrier flow path 95d are formed through the hole 33 of the shaft 31 and a communication flow path (not shown) connecting the Hole 33 and the flux barrier flow path 95d connecting and extending in the rotor core 32 are connected to each other. The flow barrier flow path 95d extends over the entire axial length of the rotor core 32. In the present embodiment, part of the oil O that has flowed from the shaft flow path 95a through the hole 33 and the communication flow path into the flow barrier flow path 95d flows through the flow barrier flow path 95d to the first axial side, and the other part of the oil O that has flowed into the flow barrier flow path 95d flows through the flow barrier flow path 95d toward the second axial side. As in 2 1, a pair of flux barrier flux paths 95d are provided at both end portions of the magnet hole 38 in the second direction D2.

As in the 3 and 5 As shown, the fifth flow path portion 95, that is, the flow path, further comprises first inter-projection flow paths 95e each located in the space between the first projections 38aa juxtaposed in the axial direction, and second inter-projection flow paths 95f each in the space between the second projections 38ab juxtaposed in the axial direction. More specifically, the first inter-protrusion flux paths 95e are arranged at both end portions of the magnet hole 38 in the second direction D2. The second inter-protrusion flux paths 95f are provided at both end portions of the magnet hole 38 in the second direction D2. A plurality of first inter-protrusion flux paths 95 e are provided along the axial direction in the magnet hole 38 . A plurality of second inter-protrusion flux paths 95f are provided along the axial direction in the magnet hole 38 . The flow barrier flow path 95d, the first inter-protrusion flow paths 95e, and the second inter-protrusion flow paths 95f communicate with each other.

As in 1 As shown, the oil O stored in the transmission case 61 is sucked up by the pump 71 through the first flow path section 91 and flows from the pump 71 through the second flow path section 92 into the cooler 72. The oil O stored in the cooler 72 is cooled in the radiator 72 and then flows into the inside of the coolant supply part 50 through the third flow path portion 93. The oil 50 that has flowed into the coolant supply part 50 is partially injected from the supply part 50a and supplied to the stator 40 . The oil O that has flowed into the coolant supply part 50 also partly flows into the inside of the shaft 31 through the fourth flow path portion 94. A part of the oil O that has flowed into the shaft 31 comes through the shaft flow path 95a, the hole 33 , the communication flow path, the flux barrier flow path 95d, the first inter-protrusion flow paths 95e, and the second inter-protrusion flow paths 95f to disperse to the stator 40. The other part of the oil O that has flowed into the shaft 31 passes through the shaft flow path 95a, is discharged into the gear case 61 from an opening of the shaft 31 on the first axial side, and is stored in the gear case 61 again.

The oil O supplied to the rotor 30 and the stator 40 absorbs heat from the rotor 30 and the stator 40 . The oil O that has cooled the rotor 30 and the stator 40 falls down to collect in a lower region in the motor housing 20 . The oil O collected in the lower region in the motor case 20 returns to the interior of the transmission case 61 through the partition wall opening 22a provided in the partition wall 22. As shown in FIG. As described above, the coolant flow path 90 allows the oil O stored in the transmission case 61 to be supplied to the rotor 30 and the stator 40 .

According to the present embodiment, the magnet 36 can be cooled by causing the oil O as the coolant to flow through the flow barrier flow path 95d. Thus, it is possible to prevent a change in magnetic characteristics caused by a temperature rise of the magnet 36. In addition, in a case where an external impact is applied to the rotary electric machine 10 and transmitted to the rotor 30, by the oil O flowing through the flow barrier flow path 95d, for example, an effect (damping effect) of damping vibration be obtained. Further, the oil O flows to the first inter-protrusion flow path 95e and the second inter-protrusion flow path 95f through the flow barrier flow path 95d, and therefore a contact area between the magnet 36 and the oil O increases. Consequently, the magnet 36 can be cooled more stably. In addition, the oil O flowing through the first inter-protrusion flow path 95e and the second inter-protrusion flow path 95f also reduces shock and dampens vibration.

Note that the present invention is not limited to the embodiment described above, and the configuration or the like can be changed within a range not deviating from the scope of the present invention, for example, as described below. It should be noted that the same components as those of the embodiment described above are denoted by the same reference numerals in the drawings of each modification, and differences will mainly be described below.

9 12 is a partial front view showing a first modification of the rotor 30 described in the embodiment described above. As in the embodiment described above, in the first modification, the first magnet hole 38A and the second magnet holes 38B and 38C have a common configuration. Hereinafter, the configuration that the first magnet hole 38A and the second magnet holes 38B and 38C have in common is explained with reference to FIG 9 described. It should be noted that 9 12 shows the first magnet hole 38A as an example of the magnet holes 38. FIG.

In the first modification, which in 9 1, the first projection 38aa also projects from the other facing wall surface 38c of the pair of facing wall surfaces 38c of the magnet hole 38 positioned on the radially outer side. More specifically, in the first modification, the plurality of first projections 38aa are provided at intervals in the second direction D2 in the wall of the inner walls of the first hole 38a positioned on the one facing wall surface 38c positioned on the radially inner side . In the example given in 9 As shown, the pair of first projections 38aa are provided on the wall positioned on the one facing wall surface 38c of the first hole 38a. The plurality of first projections 38aa are provided at intervals in the second direction D2 in the wall of the inner walls of the first hole 38a positioned on the other facing wall surface 38c positioned on the radially outer side. In the example given in 9 As shown, the pair of first projections 38aa are provided on the wall positioned on the other facing wall surface 38c of the first hole 38a.

Of the pair of first projections 38aa provided on the wall positioned on the other facing wall surface 38c of the first hole 38a, the first projection 38aa positioned on one side in the second direction D2 is the first surface 36a of the magnet 36 positioned on the one side in the second direction D2. Of the pair of first projections 38aa provided on the wall positioned on the other facing wall surface 38c of the first hole 38a, the first projection 38aa positioned on the other side in the second direction D2 is the first surface 36a of the magnet 36 positioned on the other side in the second direction D2. That is, the magnet 36 is arranged between the two projections 38aa that are adjacent to each other in the second direction D2 in the wall positioned on the other facing wall surface 38c of the first hole 38a. It should be noted that in the example given in 9 is shown, which one side in the second direction D2 corresponds to the first peripheral side (+θ side), and the other side in the second direction D2 corresponds to the second peripheral side (-θ side).

According to the first modification, on the other facing wall surface 38c of the magnet hole 38, the magnet 36 can be pressed on both sides in the second direction D2 by the plurality of first projections 38aa. It is possible to more stably position the magnet 36 in the second direction D2 with respect to the magnet hole 38 .

In the first modification, the first projection 38aa of the pair of first projections 38aa provided on the wall positioned on the one facing wall surface 38c of the first hole 38a positioned on the one side in the second direction D2 , and the first projection 38aa of the pair of first projections 38aa provided on the wall positioned on the other facing wall surface 38c of the first hole 38a positioned on the one side in the second direction D2, side by side in arranged in the first direction D1. The first projection 38aa of the pair of first projections 38aa provided on the wall positioned on the one facing wall surface 38c of the first hole 38a positioned on the other side in the second direction D2 and the first projection 38aa of the pair of first projections 38aa provided on the wall positioned on the other facing wall surface 38c of the first hole 38a positioned on the other side in the second direction D2 are juxtaposed in the first direction D1 arranged. That is, the plurality of first projections 38aa are provided on the inner wall of the first hole 38a side by side in the first direction D1. More specifically, in the first modification, the pair of first projections 38aa are arranged side by side in the first direction D1 at the end portion of the first hole 38a on the one side in the second direction D2. In addition, the pair of first projections 38aa are arranged side by side in the first direction D1 at the end portion of the first hole 38a on the other side in the second direction D2.

Although not specifically shown, in the first modification, the plurality of first projections 38aa arranged on the one facing wall surface 38c of the magnet hole 38 are provided along the axial direction. More specific are the rows of first protrusions 38aa formed by arranging the plurality of first projections 38aa side by side in the axial direction are provided at the end portion of the one facing wall surface 38c on the one side in the second direction D2 and the end portion on the other side in the second direction D2. Moreover, the plurality of first projections 38aa arranged on the other facing wall surface 38c of the magnet hole 38 are also provided along the axial direction. More specifically, the rows of the first projections 38aa formed by arranging the plurality of first projections 38aa side by side in the axial direction are at the end portion of the other facing wall surface 38c on one side in the second direction D2 and the end portion on the other side provided in the second direction D2. In the rows of the first projections 38aa, a space is provided between the first projections 38aa arranged side by side in the axial direction.

Also in the first modification, the second projection 38ab projects from the other facing wall surface 38c. More specifically, in the first modification, the plurality of second projections 38ab are provided at intervals in the second direction D2 in the wall positioned on the one facing wall surface 38c of the inner walls of the first hole 38a positioned on the radially inner side. In the example given in 9 As shown, the pair of second projections 38ab are provided on the wall positioned on the one facing wall surface 38c of the first hole 38a. The plurality of second projections 38ab are provided at intervals in the second direction D2 on the wall positioned on the other facing wall surface 38c of the inner walls of the first hole 38a positioned on the radially outer side. In the example given in 9 As shown, the pair of second projections 38ab is provided on the wall provided on the other facing wall surface 38c of the first hole 38a.

The second projection 38ab of the pair of second projections 38ab provided on the wall positioned on the other facing wall surface 38c of the first hole 38a positioned on the one side in the second direction D2 is the end portion of the another second surface 36b positioned on the radially outer side of the magnet 36 faces on the one side in the second direction D2. The second projection 38ab of the pair of second projections 38ab provided on the wall positioned on the other facing wall surface 38c of the first hole 38a positioned on the other side in the second direction D2 is the end portion of the faces another second surface 36b of the magnet 36 on the other side in the second direction D2. That is, in the first modification, the plurality of second protrusions 38ab are provided on the inner wall of the first hole 38a so as to face the second surfaces 36b of the magnet 36.

Although not specifically shown, in the first modification, the plurality of second projections 38ab arranged on the one facing wall surface 38c of the magnet hole 38 are provided along the axial direction. More specifically, the rows of the second projections 38ab formed by arranging the plurality of second projections 38ab side by side in the axial direction are at the end portion of the one facing wall surface 38c on one side in the second direction D2 and the end portion on the other side provided in the second direction D2. In addition, the plurality of second projections 38ab arranged on the other facing wall surface 38c of the magnet hole 38 are also provided along the axial direction. More specifically, the rows of the second projections 38ab formed by arranging the plurality of second projections 38ab side by side in the axial direction are at the end portion of the other facing wall surface 38c on one side in the second direction D2 and the end portion on the other side provided in the second direction D2. In the rows of the second projections 38ab, a space is provided between the second projections 38ab juxtaposed in the axial direction.

In the first modification, the plurality of foam sheets 37A are provided. At least one of the plurality of foam sheets 37A is interposed between the one facing wall surface 38c of the magnet hole 38 positioned on the radially inner side and the one second surface 36b of the magnet 36 positioned on the radially inner side. At least another one of the plurality of foam sheets 37A is interposed between the other facing wall surface 38c of the magnet hole 38 positioned on the radially outer side and the other second surface 36b of the magnet 36 positioned on the radially outer side.

In the first modification, a part of the foam sheet 37A positioned on the radially inner side is placed in the space between the second projections 38ab arranged side by side in the axial direction on the one facing wall surface 38c. More specifically, the end portion of the foam board 37A positioned on the radially inner side on the one side in the second direction D2 is arranged in the gap between the second projections 38ab of the one facing wall surface 38c on the one side in the second direction D2 are positioned and arranged side by side in the axial direction. The end portion of the foam board 37A positioned on the radially inner side, on the other side in the second direction D2, is arranged in the gap between the second projections 38ab of the one facing wall surface 38c, on the other side in the second direction D2 positioned and arranged side by side in the axial direction.

A part of the foam sheet 37A positioned on the radially outer side is arranged in a space between the second projections 38ab arranged side by side in the axial direction on the other facing wall surface 38c. More specifically, the end portion of the foam board 37A positioned on the radially outer side is located on one side in the second direction D2 in the gap between the second projections 38ab of the other facing wall surface 38c positioned on one side in the second direction D2 positioned and arranged side by side in the axial direction. The end portion of the foam board 37A positioned on the radially outer side, on the other side in the second direction D2, is arranged in the gap between the second projections 38ab of the other facing wall surface 38c, which is on the other side in the second direction D2 positioned and arranged side by side in the axial direction.

In the first modification, during the manufacture of the rotor 30, the foamed sheet 37A positioned on the radially inner side is expanded by heating, and a part of the foamed sheet 37A penetrates into the space between the second projections 38 juxtaposed in the axial direction are arranged on the one facing wall surface 38c, and is cured. In addition, the foam sheet 37A positioned on the radially outer side is expanded by heating, and part of the foam sheet 37A penetrates into the gap between the second projections 38ab arranged side by side in the axial direction on the other facing wall surface 38c , and is cured. Consequently, an anchor effect is obtained, preventing each foam sheet 37A from moving with respect to the magnet hole 38.

10 12 is a partial front view showing a second modification of the rotor 30 described in the embodiment described above, and shows the vicinity of the first projection 38aa and the second projection 38ab in an enlarged manner. In the second modification, which 10 1, part of the foam board 37A is also arranged in the space between the first projections 38aa arranged side by side in the axial direction. Furthermore, a part of the foam board 37A is also arranged in the recess 38ac. According to the second modification, since part of the foam sheet 37A expanded by heating penetrates into the space between the first projections 38aa arranged side by side in the axial direction and is hardened, the anchoring effect is further improved. Moreover, since part of the foam sheet 37A expanded by heating enters the recess 38ac and is hardened, the anchoring effect is further improved. In the second modification, part of the foam board 37A need not be placed in the space between the second projections 38ab arranged side by side in the axial direction.

11 13 is a partial front view showing a third modification of the rotor 30 described in the embodiment described above, and shows the vicinity of the first projection 38aa and the second projection 38ab in an enlarged manner. In the third modification, which is 11 As shown, the inserting portion 37 has a resin 37B instead of the foam board 37A. The resin 37B is interposed between the inner wall of the magnet hole 38 and the magnet 36 . More specifically, part of the resin 37B is in at least one or more of the gap between the one facing wall surface 38c and the one second surface 36b, the gap between the flow barrier 38e and the first projections 38aa arranged side by side in the axial direction, and the clearance between the second projections 38ab arranged side by side in the axial direction. Although not specifically shown, in the third modification, a part of the resin 37B may be interposed between the other facing wall surface 38c and the other second surface 36b. In the third modification, the resin 37B is filled over the entire region between the inner wall of the magnet hole 38 and the magnet 36.

As in the third modification, in a case where the inserting portion 37 has the resin 37B, the resin 37B spreads easily over the entire magnet hole 38 through each gap between the first projections 38aa arranged side by side in the axial direction and between the second projections 38ab arranged side by side in the axial direction, when the molten resin 37B is injected into the magnet hole 38, it stably fills and solidifies. Consequently, an unintentional void is hard to form in the magnet hole 38, and the magnet 36 can be stably held in a state of being positioned in the magnet hole 38.

As described above, according to the above-described embodiment and each modification, the components of the rotor core 32 can be used in common regardless of whether the inserting portion 37 includes the foam board 37A or whether the inserting portion includes the resin 37B. Consequently, regardless of the type or the like of the insertion portion 37, the rotor 30 can be easily manufactured, and the magnetic characteristics of the rotor 30 are stabilized.

In the third modification, the insertion portion 37 includes the resin 37B, and a part of the resin 37B is disposed in each of the first flow barrier portion 38ea and the second flow barrier portion 38eb. According to the third modification, for example, when the molten resin 37B is injected into the magnet hole 38, a part of the resin 37B is placed in each of the first flow barrier portion 38ea and the second flow barrier portion 38eb by using the flow barrier 38e as a gate, wherein the resin 37B are slightly distributed over the entire magnet hole 38 by each clearance between the first projections 38aa arranged side by side in the axial direction and between the second projections 38ab arranged side by side in the axial direction.

12 14 is a partial front view showing a fourth modification of the rotor 30 described in the embodiment described above, and shows the vicinity of the first projection 38aa and the second projection 38ab in an enlarged manner. In the fourth modification, which is 12 As shown, the inserting portion 37 has the foam sheet 37A inserted between the facing wall surface 38c and the second surface 36b, and the resin 37B at least a part of which is disposed in the flow barrier 38e. In the example given in 12 1, part of the resin 37B is sandwiched between the first projections 38aa juxtaposed in the axial direction. In addition, a part of the foam board 37A and a part of the resin 37B are sandwiched between the second projections 38ab juxtaposed in the axial direction. However, the present invention is not limited to this, and in the fourth modification, a part of the foam board 37A may be interposed between the second projections 38ab juxtaposed in the axial direction, and a part of the foam board 37A and a part of the resin 37B may be arranged between the first projections 38aa juxtaposed in the axial direction. That is, in the fourth modification, at least one of a part of the resin 37B and a part of the foam board 37A is arranged between the first projections 38aa juxtaposed in the axial direction, and at least one of a part of the foam board 37A and a part of the resin 37B is interposed between the second projections 38ab arranged side by side in the axial direction.

13 14 is a cross-sectional view showing a fifth modification of the rotor 30 described in the embodiment described above. In the fifth modification, which is in 13 As shown, the rotor 30 has a pair of end plates 51 arranged at both axial end portions of the rotor core 32 . The end plate 51 has a substantially annular plate shape centered on the central axis J, for example. In the fifth modification, the end plates 51 are fixed to the rotor core 32 . The end plate 51 covers at least a part of the magnet hole 38 in the axial direction. According to the fifth modification, the end plate prevents foreign matter from entering the magnet hole 38 and further prevents the magnet 36 from falling out of the rotor core 32 .

In the fifth modification, which is in 13 As shown, the fifth flow path portion 95 includes the flow barrier flow path 95d, the first inter-protrusion flow path 95e, and the second inter-protrusion flow path 95f. In the fifth modification, the shaft flow path 95a, the flow barrier flow path 95d, the first inter-projection flow path 95e and the second inter-projection flow path 95f are connected to each other via the hole 33 of the shaft 31 and an end plate flow path 95c extending in the end plate 51. The end plate flow path 95c connects the hole 33 to the flow barrier flow path 95d, the first inter-protrusion flow path 95e, and the second inter-protrusion flow path 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 flow barrier flow path 95d, the first inter-protrusion flow path 95e and the second inter-protrusion flow path 95f flows through the fifth flow path section 95 toward the first axial side.

Although the example in which the inner wall of the second hole 38b of the magnet hole 38 has at least one third protrusion 38ba has been described in the above-described embodiment, the present invention is not limited thereto. The inner wall of the second hole 38b need not have the third projection 38ba.

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

Further, the coolant circulating in the coolant flow path 90 is not limited to the oil O. For example, an insulating liquid or water can alternatively be used as the coolant. In the case where water is used as the coolant, an insulating process can be performed on a surface of the stator 40 .

The rotary electric machine to which the present invention is applied is not limited to a motor and may be a generator. Use of the rotary electric machine is not particularly limited. For example, the rotary electric machine may be mounted on the vehicle for uses other than use to rotate the axle 64, or may be mounted on a device other than a vehicle. Furthermore, the posture of the rotary electric machine when used is not particularly limited.

The respective configurations described in the above-described embodiment and the like can be combined within a range not deviating from the scope of the present invention, and additions, deletions, substitutions and other changes in configuration are possible. Furthermore, the present invention is not limited by the above-described embodiment and the like, and is only limited by the scope of the claims.

Reference List

10

electric lathe

30

rotor

31

Wave

32

rotor core

36

magnet

36a

first surface

36b

second surface

36c

Corner

37

insertion section

37A

foam board

37B

resin

38

magnet hole

38a

first hole

38aa

first lead

38ab

second projection

38ac

recess

38b

second hole

38c

facing wall surface

38e

river barrier

38ea

first river barrier section

38eb

second river barrier section

40

stator

60

transmission device

80

layer

95a

wave flow path

95d

river barrier river path

95e

first intermediate projection flow path

95f

second intermediate projection flow path

100

drive device

D1

first direction

D2

second direction

G

space

J

central axis

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• JP 4143631 [0002]
• JP 2006311782 [0002]

Claims (18)

A rotor (30) having the following features: a rotor core (32) having an annular shape about a central axis (J); a magnet (36) disposed in a magnet hole (38) extending in an axial direction of the rotor core (32); and an insertion portion (37) inserted between an inner wall of the magnet hole (38) and the magnet (36), wherein an outer surface of the magnet (36) has the following features: a first surface (36a) extending in a first direction (D1) as seen in the axial direction, and a second surface extending in a second direction (D2) perpendicular to the first direction (D1) as seen in the axial direction, wherein the magnetic hole (38) has the following features: a plurality of first holes (38a) provided along the axial direction, and a second hole (38b) located between the first holes (38a) adjacent to each other in the axial direction and communicating with the first holes (38a), an inner wall of the first hole (38a) having: first projections (38aa) facing the first surface (36a), and second projections (38ab) facing the second surface (36b), spaces, in which a part of the insertion portion (37) can be arranged, between the first projections (38aa) arranged side by side in the axial direction, and the second projections (38ab) juxtaposed in the axial direction are provided. The rotor (30) after claim 1 wherein the rotor core (32) comprises a plurality of sheets (80) laminated in the axial direction, and the first hole (38a) and the second hole (38b) are holes penetrating the sheets in the axial direction . The rotor (30) after claim 2 wherein the plurality of plies (80) have an identical shape to each other, and each of the plies has: the first hole (38a), and the second hole (38b) extending in a circumferential direction from a position of the first hole (38a) has different positions, and the first hole (38a) of one layer (89) and the second hole (38b) of the other layer (80) which is located next to the one layer (80) in the axial direction, each other overlap as viewed in the axial direction. The rotor (30) according to one of Claims 1 until 3 wherein a plurality of the first projections (38aa) are provided on the inner wall of the first hole (38a) at intervals in the second direction (D2), and the magnet (36) between two first projections (38aa) arranged in the second direction (D2) are adjacent to each other, is arranged. The rotor (30) according to one of Claims 1 until 4 wherein the inner wall of the magnet hole (38) has a facing wall surface (38c) extending in the second direction (D2) as viewed in the axial direction and facing the second surface (36b) in the first direction (D1). , the inserting portion (37) has a foam board (37A), the foam board (37A) is inserted between the facing wall surface (38c) and the second surface (36b), a plurality of the second projections (38ab) on the inner wall of the first hole (38a) is provided at intervals in the second direction (D2), and a part of the foam sheet (37A) is arranged between two second projections (38ab) which are adjacent to each other in the second direction (D2). The rotor (30) according to one of Claims 1 until 5 wherein the inserting portion (37) comprises a foamed board (37A) or a resin (37B), and a part of the foamed board (37A) or a part of the resin (37B) in a space between the first projections (38aa) which are in are arranged side by side in the axial direction. The rotor (30) according to one of Claims 1 until 6 wherein the inserting portion comprises a foamed board (37A) or a resin (37B), and a part of the foamed board (37A) or a part of the resin (37B) in a gap between the second projections (38ab) extending in the axial direction are arranged side by side, is arranged. The rotor (30) according to one of Claims 1 until 7 wherein the outer surface of the magnet (36) has a pair of second surfaces (36b) facing opposite sides in the first direction (D1), a plurality of the second projections (38ab) on the inner wall of the first hole (38a) is provided to each second surface (36b). and a plurality of the first projections (38aa) are provided on the inner wall of the first hole (38a) side by side in the first direction (D1). The rotor (30) according to one of Claims 1 until 8th wherein the outer surface of the magnet (36) has corners (36c) where the first surface (36a) and the second surface (36b) connect, the inner wall of the first hole (38a) has a recess (38ac). , which is arranged between the first projection (38aa) and the second projection (38ab), and the recess (38ac) faces the corner. The rotor (30) according to one of Claims 1 until 9 wherein a gap is provided between the second surface (36b) and the second projection (38ab). The rotor (30) according to one of Claims 1 until 10 , in which the magnet hole (38) has a flux barrier (38e) which is arranged adjacent to the magnets (36) in the second direction (D2), the flux barrier has the following features: a first flux barrier section (38ea) which is in the first hole (38a), and a second flow barrier portion (38eb) communicating with the first flow barrier portion (38ea) and located in the second hole (28b), the insertion portion (37) comprises a resin (37B), and a part of the resin (37B) is arranged in each of the first flow barrier portion (38ea) and the second flow barrier portion (38eb). The rotor (30) according to one of Claims 1 until 11 wherein the magnet hole (38) has a flux barrier (38e) located adjacent to the magnet (36) in the second direction (D2), the inner wall of the magnet hole (38) has a facing wall surface (38c) which extending in the second direction (D2) as seen in the axial direction and facing the second surface (36b) in the first direction (D1), and the insertion section (37) comprises: a foam board (37A) between the facing wall surface (38c) and the second surface (36b) is interposed, and a resin (37B) at least a part of which is disposed in the flow barrier (38e). The rotor (30) according to one of Claims 1 until 12 , further comprising: a shaft (31) extending in the axial direction and fixed to the rotor core (32); and a flux path arranged across at least an interior of the shaft (31) and an interior of the rotor core (32), wherein the magnet hole (38) has a flux barrier (38e) adjacent to the magnets (36) in the second direction (D2), and the flow path has the following features: a ripple flow path (95a) which is arranged in the shaft (31), and a flux barrier flow path (95d) which is connected to the ripple flow path (95a) and in the flux barrier ( 38e) is arranged. The rotor (30) after Claim 13 , wherein the flow path comprises: a first inter-protrusion flow path (95e) arranged in the space between the first protrusions (38aa) juxtaposed in the axial direction, and a second inter-protrusion flow path (95f) arranged in the gap between the second protrusions (38ab) juxtaposed in the axial direction, and the flow barrier flow path (95d), the first inter-protrusion flow path (95e) and the second inter-protrusion flow path (95f) communicate with each other. The rotor (30) according to one of Claims 1 until 14 wherein the magnet (36) extends in the second direction (D2) as viewed in the axial direction, and the second direction (D2) is a direction perpendicular to a radial direction. The rotor (30) according to one of Claims 1 until 14 wherein the magnet (36) extends in the second direction (D2) as viewed in the axial direction, and the second direction (D2) is a direction extending radially outward in a circumferential direction. An electric rotary machine (10) having the following features: the rotor (30) according to one of Claims 1 until 16 ; and a stator (40) disposed on a radially outer side of the rotor (30). A drive device (100) having the following features: the rotary electric machine (10) according to Claim 17 ; and a transmission device (60) connected to the rotor (30).

Images