Rotating electric machines

Abstract

The rotating electric machine includes a stator and a rotor, the rotor including a rotor core, an axial end component, and a rotor magnet inserted into an insertion hole that penetrates the rotor core in the axial direction, the axial end component including a recessed portion into which an end portion of the rotor magnet in the axial direction is inserted, the rotor magnet including a first side surface and a second side surface different from the first side surface, the first side surface being fixed to a first inner wall surface of the insertion hole that faces the first side surface, and in a cross section perpendicular to the axial direction, a width of the first inner wall surface in a direction along the first side surface is wider than a width of the first side surface, and the second side surface is fixed to a second inner wall surface of the recess that faces the second side surface, and in a cross section perpendicular to the axial direction, a width of the second inner wall surface in a direction along the second side surface is wider than a width of the second side surface.

Description

Technical Field

[0001] The present invention relates to a rotating electric machine including a rotor core and a rotor magnet inserted into an insertion hole penetrating the rotor core in the axial direction. Background Art

[0002] Patent document 1 describes a brushless DC motor having a stator and a rotor. The rotor has a rotor core, an insertion portion formed in the rotor core, a permanent magnet built into the insertion portion, and a pair of end plates joined to the two end surfaces of the rotor core. A pair of gaps extending along the rotation axis are formed on both sides of the permanent magnet in the circumferential direction. A leaf spring is arranged between at least one of the end plates and the permanent magnet. The leaf spring presses the permanent magnet in the direction of the rotation axis so as to limit the movement of the permanent magnet in the circumferential direction and the rotation axis direction.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 9-182334 Summary of the invention

[0006] Problems to be solved by the invention

[0007] According to the structure of Patent Document 1, since gaps are formed on both sides of the permanent magnet in the circumferential direction, the width dimension of the permanent magnet can be increased even if the circumferential dimension of the insertion portion is not changed. As a result, the manufacturing mold of the rotor core can be made universal even when the width dimension of the permanent magnet is changed, thereby suppressing the increase in the manufacturing cost of the rotor associated with the change in the width dimension of the permanent magnet. However, in the structure of Patent Document 1, the position of the permanent magnet in the insertion portion is maintained only by pressing in the direction of the rotation axis of the leaf spring. Therefore, in the structure of Patent Document 1, there is a problem that it is difficult to stably maintain the permanent magnet.

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a rotating electrical machine capable of stably holding a rotor magnet while suppressing an increase in manufacturing cost associated with a change in the size of the rotor magnet.

[0009] Solutions to Solve Problems

[0010] A rotating electric machine according to the present invention comprises: a stator; and a rotor, the rotor being rotatable relative to the stator, the rotor having: a rotor core; a shaft end member, the shaft end member being provided at an end of the rotor core in the axial direction of the rotor; and a rotor magnet, the rotor magnet being inserted into an insertion hole penetrating the rotor core in the axial direction and being fixed to the rotor core and the shaft end member, respectively, the shaft end member having a recess into which the end of the rotor magnet in the axial direction is inserted, the rotor magnet having a first side surface and a second side surface different from the first side surface as side surfaces in the axial direction, the first side surface being fixed to a first inner wall surface of the insertion hole facing the first side surface, the width of the first inner wall surface in a direction along the first side surface being wider than the width of the first side surface in a cross section perpendicular to the axial direction, the second side surface being fixed to a second inner wall surface of the recess facing the second side surface, the width of the second inner wall surface in a direction along the second side surface being wider than the width of the second side surface in a cross section perpendicular to the axial direction.

[0011] Effects of the Invention

[0012] According to the present invention, it is possible to suppress an increase in manufacturing cost associated with a change in the size of the rotor magnet and to stably hold the rotor magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view showing the structure of the vehicle AC rotating machine according to the first embodiment of the present invention.

[0014] Figure 2 It is a perspective view showing the structure of a stator of the vehicle AC rotating machine according to Embodiment 1 of the present invention.

[0015] Figure 3 It is a perspective view showing the structure of a rotor of the vehicle AC rotating machine according to Embodiment 1 of the present invention.

[0016] Figure 4 It is a perspective view showing a structure in which a pair of shaft end members are removed from the rotor of the automotive AC rotating machine according to the first embodiment of the present invention.

[0017] Figure 5 This is a cross-sectional view showing a structure obtained by cutting the rotor of the vehicle AC rotating machine according to the first embodiment of the present invention perpendicularly to the axial direction.

[0018] Figure 6 This is a cross-sectional view showing a structure obtained by cutting the shaft end member of the vehicle AC rotating machine according to the first embodiment of the present invention perpendicularly to the axial direction.

[0019] Figure 7 It is a diagram showing a circuit configuration of a vehicle AC rotating machine according to Embodiment 1 of the present invention.

[0020] Figure 8 It is a cross-sectional view showing the structure of a rotor when the size of the rotor magnet is changed in the automotive AC rotating machine according to the first embodiment of the present invention.

[0021] Fig. 9 It is a cross-sectional view showing the structure of the shaft end member when the size of the rotor magnet is changed in the automotive AC rotating machine according to the first embodiment of the present invention.

[0022] Fig.10 This is a graph showing changes in output characteristics when the area of ​​the side surface perpendicular to the magnetization direction of the rotor magnet is changed in the automotive AC rotating machine according to the first embodiment of the present invention.

[0023] Fig.11 This is a cross-sectional view showing a structure of a rotor of a vehicle AC rotating machine according to a modified example of the first embodiment of the present invention cut perpendicularly to the axial direction.

[0024] Fig.12 This is a cross-sectional view showing a structure of a shaft end member of a vehicle AC rotating machine according to a modified example of the first embodiment of the present invention cut perpendicularly to the axial direction.

[0025] Fig.13 It is a cross-sectional view showing the structure of a vehicle AC rotating machine according to Embodiment 2 of the present invention cut along the axial direction.

[0026] Fig.14 It is a cross-sectional view showing the structure of a vehicle AC rotating machine according to Embodiment 3 of the present invention cut along the axial direction.

[0027] Fig.15 It is a cross-sectional view showing the structure of a vehicle AC rotating machine according to Embodiment 4 of the present invention cut along the axial direction.

[0028] Fig.16 It is a perspective view showing the structure of a rotor magnet and a pair of winding winding members of a vehicle AC rotating machine according to a fifth embodiment of the present invention.

[0029] Fig.17 It is a cross-sectional view showing the structure of a vehicle AC rotating machine according to Embodiment 6 of the present invention cut along the axial direction.

[0030] Fig.18 It is a perspective view showing the structure of a shaft end member of a vehicle AC rotating machine according to Embodiment 6 of the present invention.

[0031] Fig.19 It is a perspective view showing the structure of a shaft end member of a vehicle AC rotating machine according to Embodiment 6 of the present invention.

[0032] Fig. 20 It is a perspective view showing the structure of a rotor of a vehicle AC rotating machine according to Embodiment 7 of the present invention.

[0033] Fig.21 It is a cross-sectional view showing the structure of a shaft end member of a vehicle AC rotating machine according to Embodiment 7 of the present invention cut perpendicularly to the axial direction.

[0034] Fig. 22 It is a cross-sectional view showing the structure of a vehicle AC rotating machine cut along the axial direction according to Embodiment 8 of the present invention.

[0035] Fig.23 It is a cross-sectional view showing the structure of a vehicle AC rotating machine according to Embodiment 9 of the present invention cut along the axial direction.

[0036] Fig.24 Yes means Fig.23 A sectional view of section XXIV-XXIV.

[0037] Description of Reference Numerals

[0038] 10 stator, 11 stator core, 12 stator winding, 20 shaft, 21 slip ring holding member, 22 connection terminal, 23 slip ring, 30 rotor, 31 rotor core, 32 insertion hole, 32a, 32b, 32c, 32d inner wall surface, 33 rotor magnet, 33a, 33b axial end surface, 33c, 33d, 33e, 33f side surface, 34 rotor winding, 35a, 35b winding winding member, 36, 37 rotor magnet, 40, 41 axial end member, 42 recessed portion, 43 fin, 50 stator for rotation position sensor, 51 stator winding, 60 rotor for rotation position sensor, 61 rotor core, 70 rotation position sensor, 100 vehicle AC rotating machine, 110 AC generator motor portion, 120 power circuit portion, 130 battery, 140 control circuit portion. DETAILED DESCRIPTION

[0039] Implementation method 1.

[0040] A rotating electrical machine according to Embodiment 1 of the present invention will be described. In this embodiment, an AC rotating machine 100 for a vehicle, which is a synchronous motor generator of an internal magnet type, is exemplified as the rotating electrical machine. Figure 1 1 is a perspective view showing the structure of a vehicle AC rotating machine 100 according to the present embodiment. Figure 1 Components such as the front bracket, the rear bracket, and the bearings that are not directly related to the present embodiment are omitted. Figure 2 It is a perspective view showing the structure of a stator 10 of a vehicle AC rotating machine 100 according to the present embodiment. Figure 3 It is a perspective view showing the structure of the rotor 30 of the vehicle AC rotating machine 100 according to the present embodiment. Figure 4 1 is a perspective view showing a structure in which a pair of shaft end members 40 and 41 are removed from the rotor 30 of the vehicle AC rotating machine 100 according to the present embodiment. Figure 1 to Figure 4 In the diagram, the direction along the axis of the rotor 30 is referred to as the axial direction, the direction along the radius of the rotor 30 is referred to as the radial direction, and the direction in which the rotor 30 rotates is referred to as the rotational direction.

[0041] like Figure 1 to Figure 4 As shown, the vehicle AC rotating machine 100 includes a stator 10 and a rotor 30 provided on the inner circumference of the stator 10 and rotating around a shaft 20. The stator 10 is provided so as to surround the outer circumference of the rotor 30 with a gap therebetween. The stator 10 is fixed to the front bracket and the rear bracket, respectively. The shaft 20 is rotatably supported by the front bracket and the rear bracket, respectively, via bearings.

[0042] The stator 10 includes a cylindrical stator core 11 and a stator winding 12 wound around the stator core 11. As the rotor 30 rotates, magnetic flux from a rotor magnet 33 described later interlinks with the stator winding 12.

[0043] The rotor 30 is a built-in magnet type rotor, and includes a cylindrical rotor core 31 and at least one rotor magnet 33 inserted into an insertion hole 32 that penetrates the rotor core 31 in the axial direction. Figure 4 The rotor 30 shown has 24 rotor magnets 33. The rotor core 31 has a structure in which a plurality of rotor core plates are stacked in the axial direction. The rotor magnet 33 has a rectangular flat plate shape that is long in one direction. The length direction of the rotor magnet 33 inserted into the insertion hole 32 is along the axial direction of the rotor 30. The axial ends of the rotor magnet 33 protrude axially outward from the axial ends of the rotor core 31, respectively. A pair of axial end faces 33a, 33b perpendicular to the axial direction are formed at the axial ends of the rotor magnet 33. Figure 4 In the figure, only the axial end face 33a on the near side is shown. The rotor magnet 33 has four side faces 33c, 33d, 33e, and 33f along the axial direction between the pair of axial end faces 33a and 33b.

[0044] The rotor 30 further includes a pair of shaft end members 40 and 41 for maintaining the axial position of the rotor magnet 33. The pair of shaft end members 40 and 41 are provided at both axial ends of the rotor core 31, sandwiching the rotor core 31. The pair of shaft end members 40 and 41 are formed of the same material as the rotor core 31 or a material different from the rotor core 31. A recess 42 (see FIG. 4 ) is formed in each of the pair of shaft end members 40 and 41, into which the axial ends of the rotor magnet 33 are inserted. Figure 6 The rotor magnet 33 is fixed to the rotor core 31, the shaft end member 40, and the shaft end member 41 by a fixing member (not shown) made of a non-magnetic body. As the fixing member, for example, an adhesive can be used.

[0045] Figure 5 2 is a cross-sectional view showing a structure of a rotor 30 of a vehicle AC rotating machine 100 according to the present embodiment cut perpendicularly to the axial direction. Figure 5 and the following Figure 6 In FIG. 1 , the respective magnetization directions of the rotor magnets 33 are indicated by thick arrows. Figure 5 As shown, the rotor magnet 33 has a rectangular cross-sectional shape. The side surface 33c and the side surface 33d are the long sides in the cross-sectional shape obtained by cutting the rotor magnet 33 perpendicularly to the axial direction. The side surface 33c and the side surface 33d are parallel to each other and are both perpendicular to the magnetization direction of the rotor magnet 33. The side surface 33e and the side surface 33f are the short sides in the cross-sectional shape obtained by cutting the rotor magnet 33 perpendicularly to the axial direction. The side surface 33e and the side surface 33f are parallel to each other and are both parallel to the magnetization direction of the rotor magnet 33. When the rotor magnet 33 is observed along the axial direction, the side surface 33e is perpendicular to the side surface 33c and the side surface 33d, respectively. That is, the side surface 33e is not parallel to the side surface 33c and the side surface 33d. Moreover, when the rotor magnet 33 is observed along the axial direction, the side surface 33f is perpendicular to the side surface 33c and the side surface 33d, respectively. That is, the side surface 33f is not parallel to the side surface 33c and the side surface 33d, respectively.

[0046] The side surface 33c is the side surface located on the outside in the radial direction of the rotor 30 of the two side surfaces 33c and 33d perpendicular to the magnetization direction of the rotor magnet 33. The side surface 33c is fixed to the inner wall surface 32a of the insertion hole 32 facing the side surface 33c. The side surface 33c and the inner wall surface 32a are bonded to each other with an adhesive layer (not shown) interposed therebetween. Figure 5 In the cross section shown, the width of the inner wall surface 32a in the direction along the side surface 33c is wider than the width of the side surface 33c.

[0047] The side surface 33d is the side surface located on the inner side in the radial direction of the rotor 30 of the two side surfaces 33c and 33d perpendicular to the magnetization direction of the rotor magnet 33. The side surface 33d is arranged with a gap relative to the inner wall surface 32b of the insertion hole 32 facing the side surface 33d. A space may be formed between the side surface 33d and the inner wall surface 32b, or a filling member such as resin may be filled. Furthermore, the side surface 33d may be fixed to the inner wall surface 32b. Figure 5 In the cross section shown, the width of the inner wall surface 32b in the direction along the side surface 33d is wider than the width of the side surface 33d.

[0048] The side surface 33e is disposed with a gap with respect to the inner wall surface 32c of the insertion hole 32 that faces the side surface 33e. A space may be formed between the side surface 33e and the inner wall surface 32c, or a filling member such as resin may be filled.

[0049] The side surface 33f is arranged with a gap relative to the inner wall surface 32d of the insertion hole 32 facing the side surface 33f. A space may be formed between the side surface 33f and the inner wall surface 32d, or a filling member such as resin may be filled. Either the side surface 33e and the inner wall surface 32c or the side surface 33f and the inner wall surface 32d may be joined with an adhesive layer interposed therebetween.

[0050] Figure 6 1 is a cross-sectional view showing the structure of the shaft end member 40 of the vehicle AC rotating machine 100 of this embodiment cut perpendicularly to the axial direction. It should be noted that the cross-sectional structure of the shaft end member 41 of this embodiment is the same as the cross-sectional structure of the shaft end member 40. Figure 6 As shown, the side surface 33c of the rotor magnet 33 is arranged with a gap with respect to the inner wall surface 42a of the recess 42 facing the side surface 33c. A space may be formed between the side surface 33c and the inner wall surface 42a, or a filling member such as resin may be filled.

[0051] The side surface 33d is disposed with a gap with respect to the inner wall surface 42b of the recessed portion 42 facing the side surface 33d. A space may be formed between the side surface 33d and the inner wall surface 42b, or may be filled with a filling member such as resin.

[0052] The side surface 33e is fixed to the inner wall surface 42c of the concave portion 42 facing the side surface 33e. The side surface 33e and the inner wall surface 42c are bonded to each other with an adhesive layer (not shown) interposed therebetween. Figure 6 In the cross section shown, the width of the inner wall surface 42c in the direction along the side surface 33e is wider than the width of the side surface 33e.

[0053] The side surface 33f is fixed to the inner wall surface 42d of the recessed portion 42 facing the side surface 33f. The side surface 33f and the inner wall surface 42d are bonded to each other via an adhesive layer (not shown). Figure 6 In the cross section shown, the width of the inner wall surface 42d in the direction along the side surface 33f is wider than the width of the side surface 33f. It should be noted that in the present embodiment, both the side surface 33e and the side surface 33f are fixed to the inner wall surface of the recess 42, but the side surface 33e or the side surface 33f can also be arranged with a gap relative to the inner wall surface of the recess 42.

[0054] Here, refer to Figure 5 and Figure 6, the size of the insertion hole 32 in the cross section perpendicular to the axial direction is compared with the size of the recess 42 in the cross section perpendicular to the axial direction. The width of the inner wall surface 32a of the insertion hole 32 in the direction along the side surface 33c is wider than the width of the inner wall surface 42a of the recess 42 in the direction. The width of the inner wall surface 32b of the insertion hole 32 in the direction along the side surface 33d is wider than the width of the inner wall surface 42b of the recess 42 in the direction. The width of the inner wall surface 32c of the insertion hole 32 in the direction along the side surface 33e, that is, the interval between the inner wall surface 32a and the inner wall surface 32b, is narrower than the width of the inner wall surface 42c of the recess 42 in the direction. The width of the inner wall surface 32d of the insertion hole 32 in the direction along the side surface 33f, that is, the interval between the inner wall surface 32a and the inner wall surface 32b, is narrower than the width of the inner wall surface 42d of the recess 42 in the direction.

[0055] The rotor magnet 33 is fixed to the rotor core 31 by the surface bonding between the side surface 33c and the inner wall surface 32a. Moreover, the rotor magnet 33 is also fixed to the shaft end member 40 by the surface bonding between the side surface 33e and the inner wall surface 42c and the surface bonding between the side surface 33f and the inner wall surface 42d. Thus, the rotor magnet 33 is prevented from being held by point contact with the holding member, and the rotor magnet 33 can be stably held. The stress generated in the rotor magnet 33 in the state where the rotor magnet 33 is fixed is dispersed according to the size of the fixed surface. Therefore, according to this embodiment, the reduction in the strength of the rotor magnet 33 can be suppressed.

[0056] In this embodiment, the rotor magnet 33 can be fixed to the rotor core 31 and the shaft end member 40 without using elastic members. Therefore, according to this embodiment, the stress generated in the rotor magnet 33 can be reduced, so the strength of the rotor magnet 33 can be suppressed from decreasing.

[0057] Figure 7 1 is a diagram showing a circuit configuration of a vehicle AC rotating machine 100 according to the present embodiment. The vehicle AC rotating machine 100 is provided in a hybrid vehicle having an engine. Figure 7 As shown, the vehicle AC rotating machine 100 includes: an AC generator motor unit 110 including a stator 10 and a rotor 30; a power circuit unit 120 that supplies AC power to the AC generator motor unit 110; a battery 130 that supplies DC power to the power circuit unit 120; and a control circuit unit 140 that controls the power circuit unit 120.

[0058] The operation of the vehicle AC rotating machine 100 as a motor is described. The DC power from the battery 130 is supplied to the power circuit unit 120 via the power supply terminal. The control circuit unit 140 performs switching control of each switching element of the power circuit unit 120. Thus, the DC power supplied to the power circuit unit 120 is converted into AC power. The converted AC power is supplied to the stator winding 12 of the AC generator motor unit 110. The magnetic flux formed by the rotor magnet 33 interlinks with the stator winding 12 where the AC current flows. Thus, a driving torque is generated, and the rotor 30 is driven to rotate.

[0059] The operation of the vehicle AC rotating machine 100 as a generator will be described. When the engine is running, the rotational torque of the engine is transmitted from the crankshaft to the shaft 20 via mechanical connection components such as belts and gears, and the rotor 30 rotates. At this time, the magnetic flux formed by the rotor magnet 33 interlinks with the stator winding 12, and a three-phase AC voltage is induced in the stator winding 12. The control circuit unit 140 controls the switching of each switching element of the power circuit unit 120, thereby converting the three-phase AC power induced in the stator winding 12 into DC power, and charging the battery 130.

[0060] Next, Figure 5 and Figure 6 The following describes a case where the size of the rotor magnet 33 is changed so that the area of ​​the side surface 33 c fixed to the rotor core 31 is increased, taking the rotor magnet 33 shown in the figure as a reference. Figure 8 It is a cross-sectional view showing the structure of the rotor 30 when the size of the rotor magnet 33 is changed in the automotive AC rotating machine 100 according to the present embodiment. Fig. 9 2 is a cross-sectional view showing the structure of the shaft end member 40 when the size of the rotor magnet 33 is changed in the vehicle AC rotating machine 100 of the present embodiment. Figure 5 and Figure 6 Compared with the rotor magnet 33 shown, Figure 8 and Fig. 9 The dimensions of the rotor magnet 33 shown are modified in such a way that the width of the side surface 33 c increases.

[0061] exist Figure 6 In the shaft end member 40 shown in FIG. 1 , the width of the inner wall surface 42a in the direction along the side surface 33c is substantially equal to the width of the side surface 33c. Therefore, when the size of the rotor magnet 33 is changed so that the width of the side surface 33c is increased, it is necessary to Fig. 9 As shown in the figure, the width of the inner wall surface 42a is increased in accordance with the width of the side surface 33c. Therefore, in order to hold the rotor magnet 33, it is necessary to change the manufacturing mold of the shaft end member 40.

[0062] On the other hand, Figure 5In the rotor core 31 shown, the width of the inner wall surface 32a in the direction along the side surface 33c is formed wider than the width of the side surface 33c. Therefore, even if the size of the rotor magnet 33 is changed so that the width of the side surface 33c is increased, the rotor core 31 does not need to be changed and the rotor core 31 of the same shape can be used, so the manufacturing mold of the rotor core 31 can be made common. That is, when the size of the rotor magnet 33 is changed so that the area of ​​the side surface 33c fixed to the rotor core 31 is increased, although the manufacturing mold of the shaft end member 40 needs to be changed, the manufacturing mold of the rotor core 31 can be made common.

[0063] In the present embodiment, the side surface 33 c is a side surface of the rotor magnet 33 that is perpendicular to the magnetization direction. Fig.10 This is a graph showing the change in output characteristics when the area of ​​the side surface 33c perpendicular to the magnetization direction of the rotor magnet 33 is changed in the vehicle AC rotating machine 100 of this embodiment. The horizontal axis represents the speed [r / min], and the vertical axis represents the torque [Nm]. The dotted line in the graph represents the output characteristics when the area of ​​the side surface 33c is relatively small, and the solid line represents the output characteristics when the area of ​​the side surface 33c is relatively large. Fig.10 As shown, by changing the size of the rotor magnet 33 so that the area of ​​the side surface 33c is increased, the torque is improved at all rotation speeds. Therefore, according to this embodiment, by increasing the area of ​​the side surface 33c, the torque of the rotating electrical machine can be improved without changing the manufacturing mold of the rotor core 31.

[0064] Although not shown in the figure, when the size of the rotor magnet 33 is changed so that the area of ​​the side surface 33e and the side surface 33f fixed to the shaft end member 40 is increased, at least the shape of the shaft end member 40 can be standardized, and thus the manufacturing mold of the shaft end member 40 can be standardized. Moreover, when the size of the rotor magnet 33 is changed so that the area of ​​the side surface 33c is reduced, the shape of the rotor core 31 and the shape of the shaft end member 40 can be standardized, and thus the manufacturing mold of the rotor core 31 and the manufacturing mold of the shaft end member 40 can be standardized. When the size of the rotor magnet 33 is changed so that the area of ​​the side surface 33e and the side surface 33f is reduced, the shape of the rotor core 31 and the shape of the shaft end member 40 can also be standardized, and thus the manufacturing mold of the rotor core 31 and the manufacturing mold of the shaft end member 40 can be standardized.

[0065] Thus, in this embodiment, even when the size of the rotor magnet 33 is changed, it is possible to realize commonality of at least one of the manufacturing mold for the rotor core 31 and the manufacturing mold for the shaft end member 40. Therefore, according to this embodiment, it is possible to suppress an increase in manufacturing cost associated with a size change of the rotor magnet 33.

[0066] In addition, in the present embodiment, the plurality of rotor magnets 33 are magnetized so as to form magnetic flux from the radial inside to the radial outside. Thus, the magnetic flux generated by the rotor magnets 33 is easily interlinked with the stator 10 provided on the outer peripheral side of the rotor 30, thereby reducing the number of rotor magnets 33 required to obtain a desired rotating machine output.

[0067] As described above, the vehicle AC rotating machine 100 of the present embodiment includes the stator 10 and the rotor 30 rotatably provided relative to the stator 10. The rotor 30 includes: a rotor core 31; a shaft end member 40 provided at the end of the rotor core 31 in the axial direction of the rotor 30; and a rotor magnet 33 inserted into the insertion hole 32 penetrating the rotor core 31 in the axial direction and fixed to the rotor core 31 and the shaft end member 40, respectively. The shaft end member 40 includes a recess 42 into which the end of the rotor magnet 33 in the axial direction is inserted. The rotor magnet 33 includes a side surface 33c and a side surface 33e different from the side surface 33c as side surfaces in the axial direction. The side surface 33c is fixed to the inner wall surface 32a of the insertion hole 32 facing the side surface 33c. In a cross section perpendicular to the axial direction, the width of the inner wall surface 32a in the direction along the side surface 33c is wider than the width of the side surface 33c. The side surface 33e is fixed to the inner wall surface 42c of the recessed portion 42 facing the side surface 33e. In a cross section perpendicular to the axial direction, the width of the inner wall surface 42c in the direction along the side surface 33e is wider than the width of the side surface 33e. Here, the vehicle AC rotating machine 100 is an example of a rotating electric machine. The side surface 33c is an example of a first side surface. The side surface 33e is an example of a second side surface. The inner wall surface 32a is an example of a first inner wall surface. The inner wall surface 42c is an example of a second inner wall surface.

[0068] According to this structure, even when the size of the rotor magnet 33 is changed, at least one of the shape of the rotor core 31 and the shape of the shaft end member 40 can be made common, so at least one of the manufacturing mold of the rotor core 31 and the manufacturing mold of the shaft end member 40 can be made common. As a result, the increase in manufacturing cost associated with the size change of the rotor magnet 33 can be suppressed. Moreover, according to this structure, the rotor magnet 33 is fixed to both the rotor core 31 and the shaft end member 40 by joining the surfaces to each other, so the rotor magnet 33 can be stably held. Therefore, according to this embodiment, the increase in manufacturing cost associated with the size change of the rotor magnet 33 can be suppressed, and the rotor magnet 33 can be stably held.

[0069] In the vehicle AC rotating machine 100 of the present embodiment, the side surface 33c is the side surface located on the outer side in the radial direction of the rotor 30 of the two side surfaces 33c and 33d perpendicular to the magnetization direction of the rotor magnet 33. The side surface 33e is the side surface parallel to the magnetization direction of the rotor magnet 33. According to this structure, even when the size of the rotor magnet 33 is changed so that the area of ​​the side surface 33c that becomes the magnetic flux output surface of the rotor magnet 33 is increased, the shape of the rotor core 31 can be standardized, and thus the manufacturing mold of the rotor core 31 can be standardized. Therefore, the manufacturing mold of the rotor core 31 can be standardized between rotating electrical machines with different outputs.

[0070] It should be noted that, in the present embodiment, a configuration using the rotor magnet 33 having a rectangular cross-sectional shape is taken as an example, but the cross-sectional shape of the rotor magnet 33 is not limited to a rectangular shape. Fig.11 1 is a cross-sectional view showing a structure of a rotor 30 of a vehicle AC rotating machine 100 according to a modified example of the present embodiment cut perpendicularly to the axial direction. Fig.11 As shown, the multiple rotor magnets 33 of this modified example each have an arc-shaped cross-sectional shape. The rotor magnet 33 has a side surface 33c and a side surface 33d in the shape of a partial cylindrical surface, and a side surface 33e and a side surface 33f in the shape of a plane as side surfaces along the axial direction. The side surface 33c and the side surface 33d are the surfaces that become the long sides in the cross section of the rotor magnet 33 cut perpendicularly to the axial direction. In this cross section, the side surface 33c and the side surface 33d are both along the rotation direction of the rotor 30. The side surface 33e and the side surface 33f are the surfaces that become the short sides in the cross section of the rotor magnet 33 cut perpendicularly to the axial direction. In this cross section, the side surface 33e and the side surface 33f are both along the radial direction of the rotor 30.

[0071] The side surface 33c is the side surface located on the outside in the radial direction of the rotor 30 of the two side surfaces 33c and 33d of the rotor magnet 33 that are approximately perpendicular to the magnetization direction. The side surface 33c is fixed to the inner wall surface 32a of the insertion hole 32 that faces the side surface 33c. The inner wall surface 32a is formed into a partial cylindrical surface along the side surface 33c. The side surface 33c and the inner wall surface 32a are bonded to each other with an adhesive layer (not shown) interposed therebetween. Fig.11 In the cross section shown, the width of the inner wall surface 32a in the direction along the side surface 33c is wider than the width of the side surface 33c.

[0072] The side surface 33d is arranged with a gap relative to the inner wall surface 32b of the insertion hole 32 facing the side surface 33d. The inner wall surface 32b is formed into a partial cylindrical surface along the side surface 33d. A space may be formed between the side surface 33d and the inner wall surface 32b, or a filling member such as resin may be filled. The side surface 33d may also be fixed to the inner wall surface 32b. Fig.11In the cross section shown, the width of the inner wall surface 32b in the direction along the side surface 33d is wider than the width of the side surface 33d.

[0073] The side surface 33e is disposed with a gap with respect to the inner wall surface 32c of the insertion hole 32 that faces the side surface 33e. A space may be formed between the side surface 33e and the inner wall surface 32c, or a filling member such as resin may be filled.

[0074] The side surface 33f is disposed with a gap with respect to the inner wall surface 32d of the insertion hole 32 facing the side surface 33f. A space may be formed between the side surface 33f and the inner wall surface 32d, or a filling member such as resin may be filled.

[0075] Fig.12 1 is a cross-sectional view showing a structure obtained by cutting the shaft end member 40 of the vehicle AC rotating machine 100 according to a modified example of the present embodiment perpendicularly to the axial direction. Fig.12 As shown, the side surface 33c of the rotor magnet 33 is arranged with a gap with respect to the inner wall surface 42a of the recess 42 facing the side surface 33c. A space may be formed between the side surface 33c and the inner wall surface 42a, or a filling member such as resin may be filled.

[0076] The side surface 33d is disposed with a gap with respect to the inner wall surface 42b of the recessed portion 42 facing the side surface 33d. A space may be formed between the side surface 33d and the inner wall surface 42b, or may be filled with a filling member such as resin.

[0077] The side surface 33e is fixed to the inner wall surface 42c of the concave portion 42 facing the side surface 33e. The side surface 33e and the inner wall surface 42c are bonded to each other with an adhesive layer (not shown) interposed therebetween. Fig.12 In the cross section shown, the width of the inner wall surface 42c in the direction along the side surface 33e is wider than the width of the side surface 33e.

[0078] The side surface 33f is fixed to the inner wall surface 42d of the recessed portion 42 facing the side surface 33f. The side surface 33f and the inner wall surface 42d are bonded to each other via an adhesive layer (not shown). Fig.12 In the cross section shown, the width of the inner wall surface 42d in the direction along the side surface 33f is wider than the width of the side surface 33f.

[0079] Through this modification, it is also possible to obtain Figure 1 to Figure 6 The structure shown has the same effect.

[0080] Implementation method 2.

[0081] A rotating electrical machine according to a second embodiment of the present invention will be described. Fig.13It is a cross-sectional view showing the structure of the vehicle AC rotating machine 100 according to the present embodiment cut along the axial direction. It is to be noted that the components having the same functions and effects as those of the first embodiment are denoted by the same reference numerals and their description is omitted.

[0082] like Fig.13 As shown in FIG. 1 , the side surface 33c located on the radially outer side of the rotor magnet 33 is fixed to the inner wall surface 32a of the insertion hole 32 facing the side surface 33c. Furthermore, the side surface 33d located on the radially inner side of the rotor magnet 33 is fixed to the inner wall surface 42b of the recess 42 facing the side surface 33c. In this way, in the rotor magnet 33, the side surface 33c fixed to the rotor core 31 and the side surface 33d fixed to the shaft end member 40 exist outside the axial end surface 33a and the axial end surface 33b.

[0083] According to the present embodiment, the side surface 33d fixed to the shaft end member 40 in the rotor magnet 33 exists outside the axial end surface, so the rotor magnet 33 can be firmly fixed by the side surface 33c or the side surface 33d to the centrifugal force in the radial direction outward generated when the rotor 30 rotates. Therefore, the centrifugal force resistance strength of the rotor 30 can be improved.

[0084] Implementation method 3.

[0085] A rotating electrical machine according to a third embodiment of the present invention will be described. Fig.14 It is a cross-sectional view showing the structure of the vehicle AC rotating machine 100 according to the present embodiment cut along the axial direction. It is to be noted that components having the same functions and effects as those of the first or second embodiment are denoted by the same reference numerals and their description is omitted.

[0086] like Fig.14 As shown, in this embodiment, the rotor magnet inserted into the insertion hole 32 is divided into a plurality of parts in the axial direction. For example, the rotor magnet is divided into two parts: a rotor magnet 36 arranged axially near the shaft end member 40 and a rotor magnet 37 arranged axially near the shaft end member 41.

[0087] According to the present embodiment, since the rotor magnets 36 and 37 are divided in the axial direction, it is possible to reduce eddy current losses of the rotor magnets 36 and 37 caused by linkage of field magnetic flux from the stator winding 12. Therefore, the output of the automotive AC rotating machine 100 can be improved.

[0088] In addition, when the rotor magnet is divided into three or more parts in the axial direction, the surface of the rotor magnet fixed to the shaft end member 40 only needs to be provided on the rotor magnet that is closest to the shaft end member 40 in the axial direction among the divided multiple rotor magnets. Similarly, the surface of the rotor magnet fixed to the shaft end member 41 only needs to be provided on the rotor magnet that is closest to the shaft end member 41 in the axial direction among the divided multiple rotor magnets. Therefore, it is not necessary to provide a surface fixed to the shaft end member 40 or the shaft end member 41 for the rotor magnets other than the two rotor magnets near the shaft end. As a result, the width dimension of the side surface perpendicular to the magnetization direction can be made different between the rotor magnet near the shaft end and the other rotor magnets. Therefore, according to the present embodiment, it is possible to realize a vehicle AC rotating machine 100 having different magnetic characteristics using common shaft end members 40 and 41.

[0089] As described above, in the vehicle AC rotating machine 100 of the present embodiment, the rotor magnets 36 and 37 are divided into a plurality of parts in the axial direction. This configuration can reduce eddy current losses of the rotor magnets 36 and 37, thereby improving the output of the vehicle AC rotating machine 100.

[0090] Implementation method 4.

[0091] A rotating electrical machine according to a fourth embodiment of the present invention will be described. Fig.15 It is a cross-sectional view showing the structure of a vehicle AC rotating machine 100 cut along the axial direction according to Embodiment 4 of the present invention. Components having the same functions and effects as those of any of Embodiments 1 to 3 are denoted by the same reference numerals and their description is omitted.

[0092] like Fig.15 As shown, the rotor 30 includes a rotor winding 34 . The rotor winding 34 is wound around the rotor magnet 33 , and is inserted into the insertion hole 32 of the rotor core 31 together with the rotor magnet 33 .

[0093] A slip ring holding component 21 that rotates together with the shaft 20 is provided at the axial end of the shaft 20. The slip ring holding component 21 includes a slip ring 23 that contacts a brush (not shown) and a connection terminal 22 that is electrically connected to the slip ring 23 and to the rotor winding 34. DC power or AC power is supplied from an external power source to the rotor winding 34 via the slip ring 23 and the connection terminal 22. Thus, the magnetomotive force of the rotor 30 is adjusted.

[0094] As described above, in the vehicle AC rotating machine 100 of the present embodiment, the rotor 30 further includes the rotor winding 34 wound around the rotor magnet 33 and inserted into the insertion hole 32 together with the rotor magnet 33. According to this structure, the magnetic flux generated by the rotor 30 can be adjusted based on the amount of current flowing in the rotor winding 34. Therefore, in the vehicle AC rotating machine 100, a desired rotating machine output can be obtained.

[0095] Implementation method 5.

[0096] A rotating electrical machine according to a fifth embodiment of the present invention will be described. Fig.16 It is a perspective view showing the structure of the rotor magnet 33 and a pair of winding winding members 35a and 35b of the automotive AC rotating machine 100 according to the present embodiment. Fig.16 The thick dashed arrow in shows the winding direction of the rotor winding 34. It should be noted that components having the same functions and effects as those in any of the first to fourth embodiments are denoted by the same reference numerals and description thereof will be omitted.

[0097] like Fig.16 As shown, a pair of winding winding members 35a, 35b are mounted on both axial ends of the rotor magnet 33. The rotor winding 34 is wound around the rotor magnet 33 and the pair of winding winding members 35a, 35b. The rotor magnet 33 and the pair of winding winding members 35a, 35b around which the rotor winding 34 is wound are inserted into the insertion hole 32 of the rotor core 31.

[0098] The winding winding members 35a and 35b each function as an axial end member provided at an axial end portion of the rotor core 31. That is, the winding winding members 35a and 35b each have a recessed portion into which the axial end portion of the rotor magnet 33 is inserted.

[0099] As described above, in the vehicle AC rotating machine 100 of the present embodiment, the shaft end member is the winding winding member 35a or 35b mounted on the axial end of the rotor magnet 33 and wound with the rotor winding 34. According to this structure, even when the size of the rotor magnet 33 is changed in such a way that the area of ​​the side surface 33c is increased, the shape of the rotor core 31 can be made common, so the manufacturing mold of the rotor core 31 can be made common. Moreover, according to this structure, the heat generated by the rotor magnet 33 can be efficiently dissipated to the outside through the heat transfer path formed by the rotor winding 34 with high thermal conductivity. Therefore, the heat dissipation of the rotor 30 can be improved.

[0100] Implementation method 6.

[0101] A rotating electrical machine according to a sixth embodiment of the present invention will be described. Fig.17It is a cross-sectional view showing a structure of a vehicle AC rotating machine 100 according to the present embodiment cut along the axial direction. Fig.18 and Fig.19 It is a perspective view showing the structure of the shaft end member 41 of the vehicle AC rotating machine 100 of the present embodiment. Components having the same functions and effects as those of any of the first to fifth embodiments are denoted by the same reference numerals and their description is omitted.

[0102] like Figure 17 to Figure 19 As shown in the figure, the shaft end member 41 has a recess 42 into which the axial end of the rotor magnet 33 is inserted. The shaft end member 41 of this embodiment has eight recesses 42. In addition, the shaft end member 41 has a slip ring 23 that contacts a brush (not shown), and a connection terminal 22 that is electrically connected to the slip ring 23 and to the rotor winding 34. DC power or AC power is supplied to the rotor winding 34 from an external power source via the slip ring 23 and the connection terminal 22. That is, in addition to the function of holding the rotor magnet 33, the shaft end member 41 also has a function as a path for supplying power to the rotor winding 34.

[0103] As described above, in the vehicle AC rotating machine 100 of the present embodiment, the shaft end member 41 has the slip ring 23 and the connection terminal 22 electrically connected to the slip ring 23 and to the rotor winding 34. According to this structure, the function of holding the rotor magnet 33 and the function of serving as a power supply path to the rotor winding 34 can be realized by one member, so the number of components of the vehicle AC rotating machine 100 can be reduced.

[0104] Implementation method 7.

[0105] A rotating electrical machine according to a seventh embodiment of the present invention will be described. Fig. 20 It is a perspective view showing the structure of the rotor 30 of the vehicle AC rotating machine 100 according to the present embodiment. Fig.21 It is a cross-sectional view showing the structure of the shaft end member 40 of the vehicle AC rotating machine 100 of this embodiment cut perpendicularly to the axial direction. Components having the same functions and effects as those of any of the first to sixth embodiments are denoted by the same reference numerals and their description is omitted.

[0106] like Fig. 20 and Fig.21As shown, in the axial direction, a plurality of fins 43 for generating forced convection of air are formed on the respective outer surfaces of the shaft end member 40 and the shaft end member 41. The plurality of fins 43 are arranged at equal intervals along the rotation direction of the rotor 30. The plurality of fins 43 function as blades of a centrifugal fan or a diagonal flow fan, respectively. When the plurality of fins 43 rotate along with the rotation of the rotor 30, forced convection of air is generated, and the rotor 30 is cooled by heat exchange with the air. That is, in addition to the function of holding the rotor magnet 33, the shaft end member 40 and the shaft end member 41 each have the function of cooling the rotor 30. As a result, the heat generated by the rotor magnet 33 can be efficiently dissipated to the outside, thereby improving the heat dissipation of the rotor 30.

[0107] As described above, in the vehicle AC rotating machine 100 of the present embodiment, the shaft end member 40 has the plurality of fins 43 for generating forced convection of air. This configuration can efficiently dissipate heat generated by the rotor magnets 33 to the outside, thereby improving the heat dissipation of the rotor 30.

[0108] Implementation method 8.

[0109] A rotating electrical machine according to an eighth embodiment of the present invention will be described. Fig. 22 It is a cross-sectional view showing the structure of the vehicle AC rotating machine 100 of the present embodiment cut along the axial direction. It is to be noted that components having the same functions and effects as those of any of the first to seventh embodiments are denoted by the same reference numerals and their description is omitted.

[0110] like Fig. 22 As shown, the shaft end member 41 has a structure integrated with the shaft 20. That is, the shaft end member 41 and the shaft 20 are formed by integral molding. As a result, the thermal resistance between the shaft end member 41 and the shaft 20 is reduced, so that the heat generated by the rotor magnets 36 and 37 is efficiently dissipated to the bearings, the front bracket and the rear bracket via the shaft end member 41 and the shaft 20. Therefore, the heat dissipation of the rotor 30 can be improved. In the present embodiment, the shaft end member 41 has a structure integrated with the shaft 20, but the shaft end member 40 may also have a structure integrated with the shaft 20. Moreover, in the present embodiment, two rotor magnets 36 and 37 are provided, but one rotor magnet 33 may also be provided as in the first embodiment.

[0111] As described above, in the automotive AC rotating machine 100 of the present embodiment, the rotor 30 further includes the shaft 20 provided on the inner circumference of the rotor core 31. The shaft end member 41 has a structure integrated with the shaft 20. This structure can improve the heat dissipation of the rotor 30.

[0112] Implementation method 9.

[0113] A rotating electrical machine according to a ninth embodiment of the present invention will be described. Fig.23 It is a cross-sectional view showing a structure of a vehicle AC rotating machine 100 according to the present embodiment cut along the axial direction. Fig.24 Yes means Fig.23 It should be noted that components having the same functions and effects as those of any of the first to eighth embodiments are denoted by the same reference numerals and description thereof will be omitted.

[0114] like Fig.23 and Fig.24 As shown, the vehicle AC rotating machine 100 has a rotation position sensor 70 for detecting the rotation position of the rotor 30. The rotation position sensor 70 has a rotation position sensor rotor 60 and a rotation position sensor stator 50. The rotation position sensor rotor 60 has a rotor core 61. The rotor core 61 is mounted on the axial end of the rotor core 31 of the rotor 30. The rotation position sensor stator 50 has a plurality of stator windings 51. The rotation position sensor stator 50 is arranged to surround the outer circumference of the rotation position sensor rotor 60 with a gap therebetween, and is mounted on a rear bracket or a front bracket of the vehicle AC rotating machine 100.

[0115] When the rotational position sensor rotor 60 rotates together with the rotor 30, the air gap magnetic flux density distribution between the rotational position sensor rotor 60 and the rotational position sensor stator 50 changes, and the output voltages output from the stator winding 51 change. The positions of the magnetic poles of the rotor 30 are detected based on these output voltages.

[0116] The rotation position sensor rotor 60 of the present embodiment also functions as an axial end member provided at the axial end of the rotor core 31. That is, the rotation position sensor rotor 60 has a recess 42 into which the axial end of the rotor magnet 37 is inserted. The axial depth of the recess 42 is set to a depth at which the rotor magnet 37 and the rotation position sensor stator 50 are not facing each other in the radial direction. Thus, the magnetic flux of the rotor magnet 37 does not affect the rotation position sensor 70. It should be noted that, in the present embodiment, two rotor magnets 36 and 37 are provided, but a single rotor magnet 33 may be provided as in the first embodiment.

[0117] As described above, the AC rotating machine 100 for a vehicle of the present embodiment further includes the rotation position sensor 70 for detecting the rotation position of the rotor 30. The shaft end component is the rotation position sensor rotor 60 included in the rotation position sensor 70. According to this structure, the function of holding the rotor magnet 33 and the function of detecting the rotation position of the rotor 30 can be realized by one component, so the number of components of the AC rotating machine 100 for a vehicle can be reduced.

[0118] The above-mentioned embodiments 1 to 9 can be implemented in combination with each other.

Claims

1. A rotating electrical machine, wherein: The rotating electrical machine comprises: stator; and a rotor, the rotor being arranged to be rotatable relative to the stator, The rotor has: Rotor core; a shaft end member, the shaft end member being disposed at an end of the rotor core in the axial direction of the rotor; and a rotor magnet, the rotor magnet being inserted into an insertion hole penetrating the rotor core in the axial direction and being fixed to the rotor core and the shaft end member, respectively; The shaft end member has a recessed portion into which the end of the rotor magnet in the axial direction is inserted. The rotor magnet has a first side surface and a second side surface different from the first side surface as side surfaces along the axial direction, The first side surface is the side surface located on the outer side in the radial direction of the rotor, of the two side surfaces of the rotor magnet that are perpendicular to the magnetization direction. The second side surface is the side surface of the rotor magnet parallel to the magnetization direction, The first side surface is fixed to a first inner wall surface of the insertion hole facing the first side surface. In a cross section perpendicular to the axial direction, a width of the first inner wall surface in a direction along the first side surface is wider than a width of the first side surface, The second side surface is fixed to a second inner wall surface of the recessed portion facing the second side surface. In a cross section perpendicular to the axial direction, a width of the second inner wall surface in a direction along the second side surface is wider than a width of the second side surface, The rotor magnet is fixed to the rotor core by surface bonding between the first side surface and the first inner wall surface. The rotor magnet is fixed to the shaft end member by surface bonding between the second side surface and the second inner wall surface. The first side surface is arranged with a gap with respect to an inner wall surface of the recessed portion that faces the first side surface.

2. The rotating electrical machine according to claim 1, wherein: The rotor magnet is divided into a plurality of parts in the axial direction.

3. The rotating electrical machine according to claim 1, wherein: The shaft end part has fins for generating forced convection of air.

4. The rotating electrical machine according to claim 1, wherein: The rotor further includes a shaft provided on the inner circumference side of the rotor core. The shaft end member has a structure integrated with the shaft.

5. The rotating electrical machine according to claim 1, wherein: The rotating electrical machine further includes a rotation position sensor for detecting a rotation position of the rotor. The shaft end member is a rotation position sensor rotor included in the rotation position sensor.

6. The rotating electrical machine according to any one of claims 1 to 5, wherein: A width of the first inner wall surface along the first side surface in a cross section perpendicular to the axial direction is wider than a width of an inner wall surface of the recessed portion facing the first side surface in a cross section perpendicular to the axial direction along the first side surface.

7. A rotating electrical machine, wherein: The rotating electrical machine comprises: stator; and a rotor, the rotor being arranged to be rotatable relative to the stator, The rotor has: Rotor core; A shaft end member, the shaft end member being arranged at an end of the rotor core in the axial direction of the rotor; a rotor magnet, the rotor magnet being inserted into an insertion hole penetrating the rotor core in the axial direction and being fixed to the rotor core and the shaft end member, respectively, and a rotor winding, the rotor winding being wound around the rotor magnet and inserted into the insertion hole together with the rotor magnet, The shaft end member has a recessed portion into which the end of the rotor magnet in the axial direction is inserted. The rotor magnet has a first side surface and a second side surface different from the first side surface as side surfaces along the axial direction, The first side surface is the side surface located on the outer side in the radial direction of the rotor, of the two side surfaces of the rotor magnet that are perpendicular to the magnetization direction. The second side surface is the side surface of the rotor magnet parallel to the magnetization direction, The first side surface is fixed to a first inner wall surface of the insertion hole facing the first side surface. In a cross section perpendicular to the axial direction, a width of the first inner wall surface in a direction along the first side surface is wider than a width of the first side surface, The second side surface is fixed to a second inner wall surface of the recessed portion facing the second side surface. In a cross section perpendicular to the axial direction, a width of the second inner wall surface in a direction along the second side surface is wider than a width of the second side surface.

8. The rotating electrical machine according to claim 7, wherein: The shaft end member is a winding winding member that is attached to an axial end portion of the rotor magnet and is wound around the rotor winding.

9. The rotating electrical machine according to claim 7, wherein: The shaft end component has a slip ring and a connection terminal electrically connected to the slip ring and to the rotor winding.

10. The rotating electric machine according to claim 7, wherein: The first side surface is arranged with a gap with respect to an inner wall surface of the recessed portion that faces the first side surface.

11. The rotating electrical machine according to claim 7, wherein: The rotor magnet is divided into a plurality of parts in the axial direction.

12. The rotating electric machine according to claim 7, wherein: The shaft end part has fins for generating forced convection of air.

13. The rotating electric machine according to claim 7, wherein: The rotor further includes a shaft provided on the inner circumference side of the rotor core. The shaft end member has a structure integrated with the shaft.

14. The rotating electric machine according to claim 7, wherein: The rotating electrical machine further includes a rotation position sensor for detecting a rotation position of the rotor. The shaft end member is a rotation position sensor rotor included in the rotation position sensor.

15. The rotating electrical machine according to any one of claims 7 to 14, wherein: A width of the first inner wall surface along the first side surface in a cross section perpendicular to the axial direction is wider than a width of an inner wall surface of the recess facing the first side surface in a cross section perpendicular to the axial direction along the first side surface.

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