Rotating electric machine

Abstract

This rotating electric machine comprises: a shaft (14); a frame (10) having a bearing (17) that supports the shaft (14); and a rotor core (15) that is provided on the shaft (14) so as to surround the outer periphery of the shaft (14), has a first core and a second core that are disposed with a gap therebetween in the axial direction, and further has a rotor ventilation path (19) that penetrates the first core and the second core in the axial direction; a stator core (11) that is disposed outside the rotor core (15) in the radial direction and is provided on the frame (10) with a gap from the rotor core (15); a coil (12) wound around the stator core (11); and a plate (20) that is provided on the shaft (14) so as to surround the outer periphery of the shaft (14) between the first core and the second core, has a first side surface and a second side surface in the axial direction, and is provided with fins on the first side surface and the second side surface, respectively.

Description

Rotating electric machines

[0001] The present invention relates to a rotating electric machine.

[0002] In the fields of factory automation (FA) and electric vehicles (EVs), there is a demand for smaller, higher-output rotating electric machines. When the rotor of a rotating electric machine rotates, the stator and rotor generate heat. In addition, bearings generate heat due to friction, and the stator and rotor also generate heat due to windage loss between the stator and rotor. As a result, the entire rotating electric machine becomes hot, and therefore a technology for cooling the rotating electric machine is required.

[0003] Patent Document 1 discloses that, in order to cool the inside of a rotating electrical machine, fins are provided at the ends of a rotor, which is a rotor core, and the fins agitate the air inside the rotating electrical machine as the rotor rotates.

[0004] JP 2011-155720 A

[0005] The rotating electric machine disclosed in Patent Document 1 has a limited flow path through which the internal air flows, and therefore improvement in cooling performance is limited. To achieve higher output, it is necessary to further improve the cooling performance of the rotating electric machine.

[0006] The present disclosure has been made to solve the above-mentioned problems, and aims to improve the cooling performance of a rotating electrical machine.

[0007] The rotating electric machine of the present disclosure comprises a shaft that serves as a rotating axis, a frame having bearings that support the shaft, a rotor core that is provided on the shaft so as to surround the outer periphery of the shaft, has a first iron core and a second iron core arranged with a gap in the axial direction, which is the direction in which the shaft extends, and further has rotor ventilation passages that penetrate the first iron core and the second iron core in the axial direction, a stator core that is arranged outer than the rotor iron core in the radial direction, which is the radial direction of the shaft, and is provided on the frame with a gap from the rotor iron core, a coil wound around the stator iron core, and a plate that is provided on the shaft between the first iron core and the second iron core so as to surround the outer periphery of the shaft, has a first side surface and a second side surface in the axial direction, and has fins on each of the first side surface and the second side surface.

[0008] According to the present disclosure, the cooling performance of the rotating electrical machine can be improved by providing a flow path through which internal air flows between the first iron core and the second iron core.

[0009] 1 is a cross-sectional view parallel to the axial direction of a rotating electric machine according to a first embodiment. FIG. 2 is a cross-sectional view perpendicular to the axial direction of the rotating electric machine according to the first embodiment. FIG. 3 is a partial enlarged view of FIG. 1. FIG. 4 is a cross-sectional view perpendicular to the axial direction of a load side surface of a plate in a rotating electric machine according to the first embodiment. FIG. 5 is a cross-sectional view perpendicular to the axial direction of a counter-load side surface of a plate in a rotating electric machine according to the first embodiment. FIG. 6 is a cross-sectional view parallel to the axial direction of a rotating electric machine according to a second embodiment. FIG. 7 is a cross-sectional view perpendicular to the axial direction of a load side surface of a plate in a rotating electric machine according to a third embodiment. FIG. 8 is a cross-sectional view perpendicular to the axial direction of a counter-load side surface of a plate in a rotating electric machine according to the third embodiment. FIG. 9 is a cross-sectional view parallel to the axial direction of a plate in a rotating electric machine according to a fourth embodiment. FIG. 10 is a cross-sectional view perpendicular to the axial direction of a load side surface of a plate in a rotating electric machine according to a fifth embodiment. FIG. 11 is a cross-sectional view perpendicular to the axial direction of a counter-load side surface of a plate in a rotating electric machine according to the fifth embodiment. FIG. 12 is a cross-sectional view perpendicular to the axial direction of a load side surface of a plate in a rotating electric machine according to a sixth embodiment. FIG. 13 is a cross-sectional view perpendicular to the axial direction of a counter-load side surface of a plate in a rotating electric machine according to the sixth embodiment.

[0010] Hereinafter, a rotating electric machine according to an embodiment of the present disclosure will be described in detail with reference to the drawings. Note that the invention according to the present disclosure is not limited to the embodiments. The drawings are also schematic diagrams.

[0011] The terms used to express directions are as follows: The axial direction is the direction in which the shaft extends. The radial direction is the direction perpendicular to the axial direction, i.e., the radial direction of the shaft. The circumferential direction is the circumferential direction of the shaft. The load side is the side in the axial direction where a driven device (not shown) is located. The anti-load side is the side opposite the load side in the axial direction. Furthermore, terms such as "up," "down," "right," "left," "vertical," and "horizontal" are used to express directions, but these do not limit the location or orientation of the device.

[0012] First Embodiment. The configuration of a rotating electric machine 101 according to the first embodiment will be described. FIG. 1 is a cross-sectional view parallel to the axial direction of the rotating electric machine 101 according to the first embodiment. In the cross-sectional view parallel to the axial direction, the center line depicted in the figure is the axis of symmetry, and part of the figure is omitted due to symmetry with respect to the center line. FIG. 2 is a cross-sectional view perpendicular to the axial direction of the rotating electric machine 101 according to the first embodiment. FIG. 2 is a cross-sectional view taken along line A-A of the rotating electric machine 101 of FIG. 1, as viewed from the load side. In FIG. 1, the left-right direction is the axial direction, the right side is the load side, and the left side is the anti-load side. In FIG. 1, the up-down direction is the radial direction. In FIG. 2, the radial direction centered on the shaft 14 is the radial direction, and the circumferential direction centered on the shaft 14 is the circumferential direction.

[0013] As shown in FIG. 1, a rotating electric machine 101 includes a frame 10, a shaft 14, a bearing 17, a rotor core 15, a stator core 11, and a plate 20 provided with fins.

[0014] The rotating electric machine 101 is sealed by a frame 10 and has a structure that prevents outside air from entering. The interior of the rotating electric machine 101 is enclosed by the frame 10. The air inside the frame 10, which is the interior of the rotating electric machine 101, is called inside air. The air outside the frame 10 is called outside air.

[0015] The shaft 14 is supported by a bearing 17 and is provided in the frame 10. The shaft 14 passes through the frame 10.

[0016] The rotor core 15 is provided within the frame 10. The rotor core 15 has a cylindrical shape. The shaft 14 passes through the center of the rotor core 15 and the rotor core 15 is fixed to the shaft 14. The rotor core 15 rotates in conjunction with the shaft 14. The shaft 14 is the axis of rotation of the rotor core 15. The rotor core 15 is prone to becoming hot, and actively cooling the rotor core 15 can improve the cooling performance of the entire rotating electric machine 101. The rotor core 15 is the rotor.

[0017] The rotor core 15 is provided with a rotor ventilation passage 19 that passes through the rotor core 15 in the axial direction. The rotor ventilation passage 19 is a flow path through which the internal air flows in the axial direction. By providing the rotor ventilation passage 19 in the rotor core 15, the area of ​​contact between the rotor core 15 and the internal air is increased, allowing the rotor core 15 to be cooled.

[0018] 2, rotor ventilation passage 19 is provided as close as possible to the center of rotor core 15. In other words, rotor ventilation passage 19 is provided on the shaft 14 side in the radial direction of rotor core 15. By providing rotor ventilation passage 19 on the shaft 14 side, a large negative pressure is generated in fins, which will be described later, and the amount of circulating internal air can be increased.

[0019] As shown in Fig. 2, the cross-sectional shape of the rotor ventilation passage 19 is, for example, circular. This reduces ventilation resistance and increases the flow rate through the rotor ventilation passage 19. However, since a cooling effect can be obtained as long as the internal air can pass through the rotor ventilation passage 19, the cross-sectional shape of the rotor ventilation passage 19 is not limited to circular. The cross-sectional shape of the rotor ventilation passage 19 may be, for example, a polygonal shape such as a rectangle or a square, or an elliptical shape.

[0020] As shown in Fig. 1, the rotor core 15 is divided in the axial direction. The rotor core 15 has a first core and a second core. In Fig. 1, the rotor core 15 is divided into a load side and an anti-load side in the axial direction. The anti-load side core 31 is the first core, and the load side core 32 is the second core. The first core and the second core are collectively referred to as the divided rotor core 15.

[0021] In the present disclosure, the rotor core 15 is divided into two parts in the axial direction, but the rotor core 15 may be divided into three or more parts in the axial direction. Furthermore, the rotor core 15 may have not only a first core and a second core, but also a third core and other cores.

[0022] Since the rotor ventilation passage 19 passes through the rotor core 15 in the axial direction, the rotor ventilation passage 19 is provided in each of the anti-load side iron core 31 and the load side iron core 32 .

[0023] In the first embodiment, the rotor core 15 is split in the axial direction at its center. In the axial direction, the length of the anti-load side core 31 is the same as the length of the load side core 32. Furthermore, the anti-load side core 31 and the load side core 32 have shorter axial lengths than the unsplit rotor core shown in Patent Document 1. The axial length is the length along the axial direction. The axial length of the anti-load side core 31 and the axial length of the load side core 32 are shorter than the axial length of the stator core 11. Furthermore, the sum of the axial length of the anti-load side core 31 and the axial length of the load side core 32 is also shorter than the axial length of the stator core 11.

[0024] The anti-load side iron core 31 and the load side iron core 32 are arranged with a gap between them in the axial direction. The space between the anti-load side iron core 31 and the load side iron core 32 is a flow path through which the internal air flows in the radial direction.

[0025] As shown in Fig. 1, the plate 20 is provided between the divided rotor cores 15, i.e., between the anti-load side core 31 and the load side core 32. The plate 20 is provided on the shaft 14 so as to surround the outer periphery of the shaft 14. The plate 20 has a hole in its center, into which the shaft 14 is inserted. The plate 20 is fixed to the shaft 14 so that the thickness direction of the plate 20 is along the axial direction. The plate 20 is rotatable in conjunction with the shaft 14.

[0026] FIG. 3 is a partially enlarged view of FIG. 1 , showing an enlarged view of the plate 20. FIG. 4 is a cross-sectional view perpendicular to the axial direction of the load-side side surface 20b of the plate 20 in the rotating electric machine 101 according to the first embodiment. FIG. 5 is a cross-sectional view perpendicular to the axial direction of the anti-load-side side surface 20a of the plate 20 in the rotating electric machine 101 according to the first embodiment. The cross-sectional view perpendicular to the axial direction of the load-side side surface 20b of the plate 20 according to the present disclosure is a cross-sectional view taken along line B-B in the rotating electric machine 101 in FIG. 1 , as viewed from the load side. The cross-sectional view perpendicular to the axial direction of the anti-load-side side surface 20a of the plate 20 according to the present disclosure is a cross-sectional view taken along line C-C in the rotating electric machine 101 in FIG. 1 , as viewed from the anti-load side. The cross-sectional view perpendicular to the axial direction of the side surface of the plate 20 according to the present disclosure is a cross-sectional view perpendicular to the axial direction. Features of the side surface and fins of the plate 20 common to the anti-load side and the load side will be described using FIG. 4 .

[0027] 3, the plate 20 is a disk-shaped plate having a uniform cross section and a thickness in the axial direction. The plate 20 has two circular side surfaces and a peripheral wall connecting the two side surfaces.

[0028] The side surface of the plate 20 is, for example, circular. Since the cross section of the plate 20 is uniform, the cross section of the plate 20 has the same shape as the side surface. Note that the shape of the plate 20 is not necessarily limited to a disk. Furthermore, the cross section of the plate 20 does not have to be a perfect circle, and may be, for example, an ellipse or an approximate circle.

[0029] 3, the plate 20 has a counter-load side surface 20a and a load side surface 20b. The counter-load side surface 20a faces the counter-load side core 31, and the load side surface 20b faces the load side core 32. The counter-load side surface 20a is the first side surface, and the load side surface 20b is the second side surface.

[0030] The plate 20 has a plurality of fins on each of the anti-load side surface 20a and the load side surface 20b. The fins on the anti-load side surface 20a are called anti-load side fins 21, and the fins on the load side surface 20b are called load side fins 22. The anti-load side fins 21 are fins provided on the first side surface, and the load side fins 22 are fins provided on the second side surface.

[0031] The fins are provided to extend in the axial direction from the side surfaces of the plate 20 toward the divided rotor core 15. As shown in Fig. 1, the non-load side fin 21 extends from the non-load side surface 20a toward the non-load side core 31. The load side fin 22 extends from the load side surface 20b toward the load side core 32.

[0032] Because the cross section of the plate 20 is uniform, the shape of the side surface of the plate 20 is determined by the configuration of the fins provided on the side surface. In other words, the shape of the side surface of the plate 20 is a shape formed by the configuration of the fins. The shape of the side surface of the plate 20 is determined by, for example, the fin height, which is the axial length of the fin, the number of fins, the fin width, the fin inclination, etc.

[0033] In the rotating electric machine 101 according to the first embodiment, the shape of the side surfaces of the plate 20 is the same on the anti-load side and the load side. That is, the shape of the anti-load side side surface 20a is the same as the shape of the load side side surface 20b.

[0034] As shown in FIG. 3 , in the plate 20 according to the first embodiment, the length of the anti-load side fin 21 is the same as the length of the load side fin 22. The fin length is the length along the axial direction. The axial length of the fin is called the fin height. In other words, in the plate 20 according to the first embodiment, the height of the anti-load side fin 21 is the same as the height of the load side fin 22.

[0035] As shown in Fig. 4, the fins are arranged on the side surfaces of the plate 20 with gaps between them in the circumferential direction. For example, the load side fin 22 has a load side fin 22a and a load side fin 22b, and the internal air flows between the load side fins 22a and 22b. The internal air flowing between the fins removes the heat transferred from the rotor core 15 to the plate 20.

[0036] As shown in FIGS. 4 and 5 , in the plate 20 according to the first embodiment, the number of anti-load side fins 21 is the same as the number of load side fins 22 .

[0037] As shown in Figure 4, the fin has a rectangular cross section perpendicular to the axial direction. In a rectangular fin, the direction of the long side is the longitudinal direction, and the direction of the short side is the lateral direction. The fin's lateral side is called the fin's width. The fin's width is the length of the fin in the lateral direction.

[0038] 4 and 5 , in the plate 20 according to the first embodiment, the width of the anti-load side fin 21 is the same as the width of the load side fin 22. In the plate 20 according to the first embodiment, the longitudinal length of the anti-load side fin 21 is the same as the longitudinal length of the load side fin 22.

[0039] Point O shown in FIG. ０ is the center point of the shaft 14. Point O shown in FIG. １ is the point where the center line of the fin in the longitudinal direction and the center line of the fin in the lateral direction intersect, and is the center point of the fin. ０ is point O ０ and point O １ As shown in FIG. 4, the fin is a straight line passing through point O １ With the two-dot chain line L at the center ０ The fins are inclined clockwise or counterclockwise with respect to the axis of the dashed two-dot line L. In other words, the fins are inclined with respect to the radial direction. ０ The angle between the center line of the fin and the two-dot chain line L ０ The tilt angle of the fin is the angle at which the fin is tilted relative to the reference point. The tilt angle of the fin is the magnitude of the angle and is a positive value regardless of whether it is clockwise or counterclockwise.

[0040] The multiple fins provided on the side surface are all inclined at the same angle. However, some of the multiple fins provided on a certain side surface may be inclined at a different angle from the other fins. In other words, the multiple fins provided on the side surface do not all have to be inclined at the same angle.

[0041] 4 and 5, the inclination of the load side fin 22 is the same as the inclination of the anti-load side fin 21. In FIG. 4, a dashed line L ２ In FIG. 5, the dashed line L ２ and the dashed line L of the center line of the anti-load side fin 21. １ 4 is a view seen from the load side, and FIG. 5 is a view seen from the anti-load side, so the broken line L ２ 4. The non-load side fins 21 and the load side fins 22 are provided so that their inclination angles are the same. １ and dashed line L ２ The two overlap.

[0042] 1 , of the end faces of the fins of plate 20, the end face opposite the end face fixed to plate 20 is in contact with rotor core 15. In the case of non-load side fin 21, for example, one end face of non-load side fin 21 is in contact with non-load side surface 20 a, and the other face of non-load side fin 21 is in contact with non-load side core 31.

[0043] Because the material of the plates 20 and fins has a higher thermal conductivity than air, heat is transferred from the rotor core 15 to the plates 20 and fins. The area for dissipating heat from the rotor core 15 is increased by the plates 20 and fins, allowing the rotor core 15 to be cooled.

[0044] Note that a gap may be provided between the fins and the rotor core 15. By providing a gap between the fins and the rotor core 15, it is possible to prevent the rotor core 15 and the fins from interfering with each other and causing wear. It is also possible to ensure electrical insulation.

[0045] The stator core 11 is provided on the inner surface of the frame 10 so as to surround the rotor core 15. The stator core 11 is provided radially outside the rotor core 15 with a gap therebetween. The space between the stator core 11 and the rotor core 15 is called an air gap 18. The solid arrows in FIG. 1 indicate the flow of internal air. The air gap 18 is a flow path through which the internal air flows. The coil 12 is wound around the stator core 11. The stator core 11 and the coil 12 are collectively called a stator 13.

[0046] Next, the operation of the rotating electric machine 101 according to the first embodiment will be described.

[0047] In the rotating electric machine 101, the rotor core 15 and the plate 20 rotate in conjunction with the shaft 14. When the plate 20 rotates, the fins provided on the side surfaces of the plate 20 also rotate.

[0048] As shown in FIG. 1 , internal air flows within the frame 10. The internal air is mainly induced by the rotation of the fins provided on the side of the plate 20. The induced internal air first flows from the shaft 14 to the air gap 18 between the divided rotor core 15 and the plate 20. Next, the internal air flows axially through the air gap 18. Next, the internal air flows from the air gap 18 between the divided rotor core 15 and the frame 10 toward the rotor ventilation passage 19. Here, heat from the internal air is dissipated to the outside of the rotating electric machine 101 via the frame 10. The internal air then flows axially through the rotor ventilation passage 19 and circulates toward the plate 20. The internal air circulates within the rotor core 15, the plate 20, the stator 13, and the frame 10.

[0049] The internal air flows from the rotor ventilation passage 19 between the divided rotor core 15 and the plate 20, but collides with the plate 20, preventing contact between the internal air on the anti-load side and the internal air on the load side. The internal air flowing through the rotor ventilation passage 19 on the anti-load side collides with the anti-load side side of the plate 20. The internal air flowing through the rotor ventilation passage 19 on the load side collides with the anti-load side side of the plate 20. Therefore, the internal air flowing through the rotor ventilation passage 19 on the anti-load side and the internal air flowing through the rotor ventilation passage 19 on the load side do not mix. In addition, the radial flow path between the divided rotor core 15 and the plate 20 is divided into the anti-load side and the load side by the plate 20. The flow path between the anti-load side core 31 and the anti-load side side 20a of the plate 20 is called the anti-load side radial flow path. The flow path between the load-side iron core 32 and the load-side side surface 20b of the plate 20 is called the load-side radial flow path. The non-load-side radial flow path and the load-side radial flow path are independent of each other.

[0050] The rotating electric machine 101 has a load-side circulation flow path through the counter-load side iron core 31 and a load-side circulation flow path through the load-side iron core 32. The counter-load side circulation flow path is a flow path through which internal air circulates through the counter-load side iron core 31, the counter-load side surface 20 a of the plate 20, the air gap 18, the counter-load side frame 10, and the counter-load side rotor ventilation passage 19. The load-side circulation flow path is a flow path through which internal air circulates through the load-side iron core 32, the load-side side surface 20 b of the plate 20, the air gap 18, the load-side frame 10, and the load-side rotor ventilation passage 19.

[0051] As described above, the rotating electric machine 101 according to the first embodiment includes the frame 10 having the shaft 14 serving as a rotating shaft and the bearings 17 that support the shaft 14, the rotor core 15 that is provided on the shaft 14 so as to surround the outer periphery of the shaft 14 and has a first iron core (anti-load side iron core 31) and a second iron core (load side iron core 32) that are arranged with a gap in the axial direction that is the direction in which the shaft 14 extends, and further has rotor ventilation passages 19 that axially pass through the first iron core (anti-load side iron core 31) and the second iron core (load side iron core 32), and The rotor core 15 is disposed radially outward of the stator core 11 and is mounted on the frame 10 with a gap therebetween; a coil 12 wound around the stator core 11; and a plate 20 provided on the shaft 14 between a first core (anti-load side core 31) and a second core (load side core 32), the plate 20 having a first side surface (anti-load side surface 20a) and a second side surface (load side surface 20b) in the axial direction, with fins provided on each of the first side surface (anti-load side surface 20a) and the second side surface (load side surface 20b).

[0052] Since the rotor core 15 is divided axially into the anti-load side core 31 and the load side core 32, internal air flows between the anti-load side core 31 and the load side core 32, thereby cooling the rotor core 15. This improves the cooling performance of the rotating electric machine 101.

[0053] By providing the plate 20 between the anti-load side iron core 31 and the load side iron core 32, the radial flow paths on the anti-load side and the load side are separated. The internal air flowing on the anti-load side and the internal air flowing on the load side do not mix, and heat transfer between them can be suppressed, thereby improving the cooling performance of the rotating electric machine 101.

[0054] Dividing the rotor core 15 in the axial direction increases the surface area of ​​the rotor core 15. This increases the area of ​​contact between the internal air and the rotor core 15, allowing for efficient dissipation of heat from the rotor core 15. As with the rotor core 15, providing fins on the side surfaces of the plates 20 increases the area of ​​contact between the internal air and the plates 20, allowing for more efficient cooling of the heat removed from the rotor core 15.

[0055] When the internal air circulates within the frame 10, the longer the distance the air flows, the more likely it is that the temperature of the internal air will increase. Furthermore, the cooling effect downstream of the flow path is likely to be lower than that upstream of the flow path. By dividing the rotor core 15 as in the first embodiment, the length of one circuit that the internal air circulates around the rotor core 15 is shorter than in the case of a rotor core that is not divided. This makes it difficult for the internal air to increase in temperature, and prevents the cooling effect downstream of the flow path from being lower than that upstream of the flow path, thereby enabling the rotating electric machine 101 to be cooled more effectively.

[0056] The center of the rotor core 15 is more likely to accumulate heat and become hot than the outer surface that comes into contact with the internal air. By dividing the rotor core 15, the internal air can flow through the center of the rotor core 15, which prevents the rotor core 15 from becoming too hot and improves the cooling performance of the rotating electric machine 101.

[0057] As the plate 20 rotates, the fins rotate, guiding the internal air between the anti-load side iron core 31 and the load side iron core 32. Furthermore, since the internal air flowing along the side of the plate 20 flows along the longitudinal direction of the fins, the internal air can be guided in any direction by tilting the fins. This makes it possible to adjust the flow rate and windage loss of the internal air, thereby improving the cooling performance of the rotating electric machine 101.

[0058] In order to achieve high output, the rotor core 15 rotates at high speed, which increases the amount of heat generated by the rotor core 15. However, in the rotating electric machine 101 according to embodiment 1, the rotor core 15, which is prone to becoming hot, can be cooled, thereby realizing a small, high-output rotating electric machine 101.

[0059] Furthermore, in the rotating electric machine 101 according to the first embodiment, the length of the load side core 32 in the axial direction is the same as the length of the counter-load side core 31. Furthermore, in the rotating electric machine 101 according to the first embodiment, the shape of the counter-load side surface 20a of the plate 20 is the same as the shape of the load side surface 20b. Specifically, the counter-load side surface 20a and the load side surface 20b are provided with a plurality of fins, and the number of counter-load side fins 21 is the same as the number of load side fins 22. The fins provided on the counter-load side surface 20a and the load side surface 20b extend axially from the counter-load side surface 20a and the load side surface 20b, respectively, and the height of the counter-load side fins 21 is the same as the height of the load side fins 22. The center point O of the fin １ and the center point O of the shaft 14 ０ Line L passing through ０ and the center line L of the fin １ , L ２ The angle formed by these angles is defined as the inclination of the fin, and the inclination of the anti-load side fin 21 is the same as the inclination of the load side fin 22. The fin has a rectangular cross section perpendicular to the axial direction, and the length of the short side of the fin is defined as the fin width, and the width of the anti-load side fin 21 is the same as the width of the load side fin 22.

[0060] Since the shapes of the fins provided on the rotor core 15 and the plate 20 are the same on the load side and the anti-load side, manufacturing is easy.

[0061] The first core and the second core are not necessarily limited to being divided rotor core 15. For example, the first core and the second core may be rotor cores 15 each having a short axial length, and multiple rotor cores 15 each having a short axial length may be arranged.

[0062] Second Embodiment Next, a second embodiment will be described with reference to Fig. 6. A rotating electric machine 102 according to the second embodiment differs from the first embodiment in that the axial length of the load side iron core 321 is different from the axial length of the anti-load side iron core 311.

[0063] 6 is a cross-sectional view taken along a line parallel to the axial direction of a rotating electrical machine 102 according to embodiment 2. Note that the same components as those in embodiment 1 are given the same reference numerals, and the description thereof will be omitted.

[0064] In the rotating electric machine 102 according to the second embodiment, the rotor core 15 is divided unequally in the axial direction. The length of the anti-load side core 311 is different from the length of the load side core 321 in the axial direction.

[0065] A case where the axial length of the anti-load side iron core 311 is shorter than the axial length of the load side iron core 321 will be described with reference to FIG.

[0066] 6, the axial length of the anti-load side iron core 311 is shorter than the axial length of the load side iron core 321. The first iron core is the anti-load side iron core 311, and the second iron core is the load side iron core 321.

[0067] Here, an example will be described in which the temperature on the anti-load side becomes higher than that on the load side. A driven device is provided on the load side of the rotating electric machine 102. The driven device is fixed to the load-side frame 10 via a flange, for example. The flange is in contact with the load-side frame 10, and this flange transfers heat from the load-side rotating electric machine 102 through the load-side frame 10. Therefore, the load side is less likely to become higher in temperature than the anti-load side.

[0068] The axial length of the load side iron core 321 and the axial length of the anti-load side iron core 311 are desirably determined in accordance with the temperature conditions of the rotating electric machine 102. For example, the axial length of the divided rotor core 15 on the high temperature side of the rotating electric machine 103 can be made shorter than the axial length of the divided rotor core 15 on the opposite side, that is, the low temperature side.

[0069] As described above, in the rotating electric machine 102 according to the second embodiment, the length of the anti-load side iron core 311 in the axial direction is different from the length of the load side iron core 321. In the axial direction, the length of the anti-load side iron core 311 is shorter than the axial length of the load side iron core 321.

[0070] By making the axial length of the rotor core 15 different between the anti-load side and the load side, it is possible to adjust the distance of the internal air circulation flow path on the anti-load side and the distance of the internal air circulation flow path on the load side. By shortening the axial length of the rotor core 15 on the higher temperature side, the distance of the internal air circulation flow path is shortened, and the rotor core 15 on the higher temperature side can be effectively cooled. Therefore, the higher temperature side of the rotating electric machine 102 can be efficiently cooled, thereby improving the cooling performance of the rotating electric machine 102.

[0071] Although the axial length of the anti-load side iron core 311 is shorter than the axial length of the load side iron core 321, the axial length of the load side iron core 321 may be shorter than the axial length of the anti-load side iron core 311. The first iron core is the load side iron core 321, and the second iron core is the anti-load side iron core 311.

[0072] Third Embodiment Next, a third embodiment will be described with reference to Figures 7 and 8. A rotating electric machine 103 according to the third embodiment differs from the first embodiment in that the number of anti-load side fins 211 provided on the anti-load side surface 201a of the plate 201 is different from the number of load side fins 221 provided on the load side surface 201b.

[0073] Fig. 7 is a cross-sectional view perpendicular to the axial direction of the load side surface 201b of the plate 201 in the rotating electric machine 103 according to embodiment 3. Fig. 8 is a cross-sectional view perpendicular to the axial direction of the anti-load side surface 201a of the plate 201 in the rotating electric machine 103 according to embodiment 3. Note that the same components as those in embodiments 1 and 2 are designated by the same reference numerals, and description thereof will be omitted.

[0074] In the plate 201 of the rotating electric machine 103 according to the third embodiment, the shape of the anti-load side surface 201 a is different from the shape of the load side surface 201 b. In the rotating electric machine 103 according to the third embodiment, the number of fins is focused on as the shape of the side surface of the plate 201.

[0075] A case where the number of anti-load side fins 211 is greater than the number of load side fins 221 will be described with reference to FIGS. 7 and 8. FIG.

[0076] The number of anti-load side fins 211 is different from the number of load side fins 221. As shown in Figures 7 and 8, the number of anti-load side fins 211 is greater than the number of load side fins 221. The fins provided on the first side surface are anti-load side fins 211 provided on the anti-load side surface 201a. The fins provided on the second side surface are load side fins 221 provided on the load side surface 201b.

[0077] The numbers of the anti-load side fins 211 and the load side fins 221 are desirably determined depending on the temperature conditions of the rotating electric machine 103. For example, the number of fins on the side of the rotating electric machine 103 where the temperature is high may be made greater than the number of fins on the opposite side where the temperature is low.

[0078] As described above, in the rotating electric machine 103 according to the third embodiment, the number of anti-load side fins 211 is different from the number of load side fins 221 .

[0079] The flow rate of the inside air flowing on the anti-load side and the load side can be controlled independently by making the number of anti-load side fins 211 and the number of load side fins 221 different. Since the side of the rotating electrical machine 103 where the temperature is higher can be cooled efficiently, the cooling performance of the rotating electrical machine 103 can be improved.

[0080] Although the number of anti-load side fins 211 is greater than the number of load side fins 221 in the above embodiment, the number of load side fins 221 may be greater than the number of anti-load side fins 211. The fins provided on the first side surface are the load side fins 221 provided on the load side surface 201b. The fins provided on the second side surface are the anti-load side fins 211 provided on the anti-load side surface 201a.

[0081] Fourth Embodiment Next, a fourth embodiment will be described with reference to Fig. 9. The rotating electric machine 104 according to the fourth embodiment differs from the first embodiment in that the height of the anti-load side fins 212 provided on the anti-load side surface 202a of the plate 202 is different from the height of the load side fins 222 provided on the load side surface 202b.

[0082] Fig. 9 is a cross-sectional view parallel to the axial direction of plate 202 of rotating electric machine 104 according to embodiment 4. Fig. 9 is a partial enlarged view of plate 202. Note that the same components as those in embodiments 1 to 3 are designated by the same reference numerals, and description thereof will be omitted.

[0083] In the rotating electric machine 104 according to the fourth embodiment, the shape of the anti-load side surface 202 a is different from the shape of the load side surface 202 b. In the rotating electric machine 104 according to the fourth embodiment, the height of the fins is focused on as the shape of the side surface of the plate 202.

[0084] A case where the height of the anti-load side fins 212 is higher than the height of the load side fins 222 will be described with reference to FIG.

[0085] The height of the anti-load side fins 212 is different from the height of the load side fins 222. As shown in Fig. 9, the height of the anti-load side fins 212 is greater than the height of the load side fins 222. The fins provided on the first side surface are the anti-load side fins 212 provided on the anti-load side surface 202a, and the fins provided on the second side surface are the load side fins 222 provided on the load side surface 202b.

[0086] The heights of the anti-load side fins 212 and the load side fins 222 are desirably determined based on the temperature conditions of the rotating electrical machine 104. For example, the height of the fins on the side of the rotating electrical machine 104 where the temperature is higher may be made higher than the height of the fins on the side where the temperature is lower.

[0087] As described above, in the rotating electric machine 104 according to the fourth embodiment, the height of the anti-load side fins 212 is different from the height of the load side fins 222 .

[0088] The height of the counter-load side fins 212 and the height of the load side fins 222 are different, so that the flow rate of the inside air flowing on the counter-load side and the flow rate of the inside air flowing on the load side can be controlled independently. Since the side of the rotating electrical machine 104 where the temperature is higher can be cooled efficiently, the cooling performance of the rotating electrical machine 104 can be improved.

[0089] Although the height of the anti-load side fins 212 is greater than the height of the load side fins 222, the height of the load side fins 222 may be greater than the height of the anti-load side fins 212. The fins provided on the first side surface are the load side fins 222 provided on the load side surface 202b. The fins provided on the second side surface are the anti-load side fins 212 provided on the anti-load side surface 202a.

[0090] Fifth Embodiment Next, a fifth embodiment will be described with reference to Figures 10 and 11. A rotating electric machine 105 according to the fifth embodiment differs from the first embodiment in that the inclination of the counter-load side fins 213 provided on the counter-load side surface 203a of the plate 203 is different from the inclination of the load side fins 223 provided on the load side surface 203b.

[0091] Fig. 10 is a cross-sectional view perpendicular to the axial direction of the load side surface 203b of the plate 203 in the rotating electric machine 105 according to embodiment 5. Fig. 11 is a cross-sectional view perpendicular to the axial direction of the anti-load side surface 203a of the plate 203 in the rotating electric machine 105 according to embodiment 5. Note that the same components as those in embodiments 1 to 4 are designated by the same reference numerals, and description thereof will be omitted.

[0092] In the rotating electric machine 105 according to the fifth embodiment, the shape of the anti-load side surface 203 a is different from the shape of the load side surface 203 b. In the rotating electric machine 105 according to the fifth embodiment, the inclination of the fins is focused on as the shape of the side surface of the plate 203.

[0093] A case where the inclination of the anti-load side fin 213 is greater than the inclination of the load side fin 223 will be described with reference to FIGS. 10 and 11. FIG.

[0094] The inclination of the anti-load side fin 213 is different from the inclination of the load side fin 223. ４ is the center line of the load side fin 223. The dotted line L ３ is the center line of the anti-load side fin 213. As shown in FIGS. 10 and 11, the dashed line L ４ and dotted line L ３ do not match, and the inclination of the anti-load side fin 213 is different from the inclination of the load side fin 223.

[0095] 10 and 11 , the inclination of the anti-load side fins 213 is greater than the inclination of the load side fins 223. The fins provided on the first side surface are the anti-load side fins 213 provided on the anti-load side surface 203 a, and the fins provided on the second side surface are the load side fins 223 provided on the load side surface 203 b.

[0096] The inclination of the anti-load side fins 213 and the load side fins 223 is preferably determined depending on the temperature condition of the rotating electrical machine 105. For example, the inclination of the fins on the side of the rotating electrical machine 105 where the temperature is higher may be made larger than the inclination of the fins on the side where the temperature is lower.

[0097] As described above, in the rotating electric machine 105 according to the fifth embodiment, the inclination of the anti-load side fins 213 is different from the inclination of the load side fins 223 .

[0098] The inclination of the counter-load side fins 213 is different from the inclination of the load side fins 223, so that the flow rate of the inside air flowing on the counter-load side and the flow rate of the inside air flowing on the load side can be controlled independently. Since the side of the rotating electrical machine 105 where the temperature is higher can be cooled efficiently, the cooling performance of the rotating electrical machine 105 can be improved.

[0099] Although the inclination of the anti-load side fin 213 is greater than the inclination of the load side fin 223, the inclination of the load side fin 223 may be greater than the inclination of the anti-load side fin 213. The fin provided on the first side surface is the load side fin 223 provided on the load side surface 203b. The fin provided on the second side surface is the anti-load side fin 213 provided on the anti-load side surface 203a.

[0100] Sixth Embodiment Next, a sixth embodiment will be described with reference to Figures 12 and 13. The rotating electric machine 106 according to the sixth embodiment differs from the first to fifth embodiments in that the width of the anti-load side fins 214 provided on the anti-load side surface 204a of the plate 204 is different from the width of the load side fins 224 provided on the load side surface 204b.

[0101] Fig. 12 is a cross-sectional view perpendicular to the axial direction of load-side side surface 204b of plate 204 in rotary electric machine 106 according to embodiment 6. Fig. 13 is a cross-sectional view perpendicular to the axial direction of anti-load-side side surface 204a of plate 204 in rotary electric machine 106 according to embodiment 6. Note that the same components as those in embodiments 1 to 5 are designated by the same reference numerals, and description thereof will be omitted.

[0102] In the rotating electric machine 106 according to the sixth embodiment, the shape of the anti-load side surface 204 a is different from the shape of the load side surface 204 b. In the rotating electric machine 106 according to the sixth embodiment, the shape of the plate 204 is determined by the width of the fins on the side surface of the plate 204.

[0103] 12 and 13 illustrate a case where the width of the anti-load side fin 214 is shorter than the width of the load side fin 224.

[0104] The width of the anti-load side fin 214 is different from the width of the load side fin 224. As shown in Figures 12 and 13, the width of the anti-load side fin 214 is shorter than the width of the load side fin 224. The fin provided on the first side surface is the anti-load side fin 214 provided on the anti-load side surface 204a, and the fin provided on the second side surface is the load side fin 224 provided on the load side surface 204b.

[0105] The widths of the anti-load side fins 214 and the load side fins 224 are desirably determined based on the temperature conditions of the rotating electrical machine 106. For example, the width of the fins on the side of the rotating electrical machine 106 where the temperature is higher may be made larger than the width of the fins on the side where the temperature is lower.

[0106] As described above, in the rotating electric machine 106 according to the sixth embodiment, the width of the anti-load side fins 214 is different from the width of the load side fins 224 .

[0107] The width of the counter-load side fins 214 and the width of the load side fins 224 are different, so that the flow rate of the inside air flowing on the counter-load side and the flow rate of the inside air flowing on the load side can be controlled independently. Since the side of the rotating electrical machine 106 where the temperature is higher can be cooled efficiently, the cooling performance of the rotating electrical machine 106 can be improved.

[0108] Although the width of the anti-load side fin 214 is shorter than the width of the load side fin 224, the width of the load side fin 224 may be shorter than the width of the anti-load side fin 214. The fin provided on the first side surface is the load side fin 224 provided on the load side surface 204b. The fin provided on the second side surface is the anti-load side fin 214 provided on the anti-load side surface 204a.

[0109] The configurations described in the above embodiments are merely examples of the contents of the present disclosure, and the techniques of the embodiments may be combined with each other or with other known techniques. In particular, by combining the third to sixth embodiments with the second embodiment, the cooling performance of the rotating electrical machine can be improved. Furthermore, it is also possible to omit or modify part of the configuration without departing from the gist of the present disclosure.

[0110] 10 Frame, 11 Stator core, 12 Coil, 13 Stator, 14 Shaft, 15 Rotor core, 17 Bearing, 18 Air gap, 19 Rotor ventilation passage, 20 Plate, 20a, 201a, 202a, 203a, 204a Non-load side, 20b, 201b, 202b, 203b, 204b Load side, 21, 21a, 21b, 211, 212, 213, 214 Non-load side fin, 22, 221, 222, 223, 224 Load side fin, 31, 311 Non-load side core, 32, 321 Load side core, 101, 102, 103, 104, 105, 106 Rotating electric machine, O ０ Center point of shaft, O １ Fin center point, L ０ O ０ and O １ A straight line (two-dot chain line) passing through L １ Center line of the fin on the anti-load side (dashed line), L ２ , L ４ Center line of the load side fin (dashed line), L ３ Center line of the fin on the non-load side (dotted line).

Claims

1. A rotating electric machine comprising: a shaft that serves as a rotating axis; a frame having bearings that support the shaft; a rotor core that is attached to the shaft so as to surround the outer periphery of the shaft, the rotor core having a first iron core and a second iron core that are arranged with a gap in the axial direction that is the direction in which the shaft extends, and further having rotor ventilation passages that pass through the first iron core and the second iron core in the axial direction; a stator core that is arranged outward of the rotor iron core in the radial direction that is the direction of the shaft and is attached to the frame with a gap from the rotor iron core; a coil wound around the stator core; and a plate that is attached to the shaft between the first iron core and the second iron core so as to surround the outer periphery of the shaft, the plate having a first side surface and a second side surface in the axial direction, with fins provided on each of the first side surface and the second side surface.

2. A rotating electric machine according to claim 1, wherein the length of said first iron core is the same as the length of said second iron core in the axial direction.

3. A rotating electric machine according to claim 1, wherein the length of said first iron core is shorter than the length of said second iron core in the axial direction.

4. A rotating electric machine according to any one of claims 1 to 3, characterized in that the shape of the first side surface is the same as the shape of the second side surface.

5. A rotating electric machine according to any one of claims 1 to 3, characterized in that the shape of the first side surface is different from the shape of the second side surface.

6. A rotating electric machine as described in claim 5, characterized in that the first side surface and the second side surface are provided with a plurality of fins, and the number of fins provided on the first side surface is different from the number of fins provided on the second side surface.

7. A rotating electric motor as described in claim 5, characterized in that the fins provided on the first side surface and the second side surface extend in the axial direction from the first side surface and the second side surface, respectively, and the length of the fins provided on the first side surface in the axial direction is different from the length of the fins provided on the second side surface.

8. A rotating electric machine as described in claim 5, characterized in that the inclination of the fin is the angle formed by a straight line passing through the center point of the fin and the center point of the shaft and the center line of the fin, and the inclination of the fin provided on the first side surface is different from the inclination of the fin provided on the second side surface.

9. A rotating electric machine as described in claim 5, characterized in that the fins have a rectangular cross section perpendicular to the axial direction, the length of the short side of the fin is the width of the fin, and the width of the fins provided on the first side surface is different from the width of the fins provided on the second side surface.

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