Reluctance rotating electrical machine

Abstract

To provide a reluctance rotating electric machine with a new configuration capable of cooling a stator efficiently.SOLUTION: The reluctance rotating electric machine includes a stator and a rotor. The rotor iron core 31 of the rotor has: multiple magnetic plates 51; two holding plates that sandwich the multiple magnetic plates 51 in the shaft direction; and a spacing plate 71 placed between the two magnetic plates 51. The spacing plate 71 is formed with multiple convex parts 71e located at intervals around the rotation center axis and a concave part 71f that is opened to the outside in the radial direction of the rotation center axis which are provided alternately on the circumferential direction.SELECTED DRAWING: Figure 3

Description

Technical Field

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

Background Art

[0002] Conventionally, there has been a reluctance rotating electrical machine including a stator and a rotor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In this type of reluctance rotating electrical machine, it is beneficial if the stator can be efficiently cooled.

[0005] Therefore, one of the problems of the present invention is to obtain a reluctance rotating electrical machine having a novel configuration capable of efficiently cooling the stator.

Means for Solving the Problems

[0006] The reluctance rotating electric machine according to an embodiment of the present invention includes a stator, a shaft partially located inside the stator and rotatable about a rotation center axis, and a rotor having a rotor core located inside the stator and fixed to the shaft. The rotor core includes a plurality of magnetic plates arranged in the axial direction of the rotation center axis, made of a magnetic material and provided with flux barriers, two pressing plates sandwiching the plurality of magnetic plates in the axial direction, and a partition plate disposed between two adjacent magnetic plates in the axial direction. The pressing plate is provided with an opening penetrating the pressing plate in the axial direction and aligned with the flux barrier in the axial direction. The partition plate is provided with a plurality of convex portions spaced apart in the circumferential direction of the rotation center axis, and a plurality of concave portions penetrating the partition plate in the axial direction and opening to the outside in the radial direction of the rotation center axis and aligned with the flux barrier and the opening in the axial direction, which are alternately provided in the circumferential direction.

Advantages of the Invention

[0007] According to an embodiment of the present invention, a reluctance rotating electric machine with a novel configuration capable of efficiently cooling the stator can be obtained.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

DETAILED DESCRIPTION OF THE INVENTION

[0009] Exemplary embodiments of the present invention will be disclosed below. The configurations of the embodiments shown below, as well as the actions and effects brought about by the configurations, are examples. The present invention can also be realized by configurations other than those disclosed in the following embodiments. Further, according to the present invention, it is possible to obtain at least one of various effects obtained by the configuration.

[0010] Also, the drawings are schematic, and the dimensional relationships of the respective elements, the ratios of the respective elements, etc. may be different from the actual ones. Also, there may be portions where the dimensional relationships and ratios of the respective drawings are different from each other. Also, in this specification, ordinal numbers are used only for distinguishing parts, members, portions, positions, directions, etc., and do not indicate order or priority.

[0011] <Configuration of the Totally Enclosed Outer Sector Rotating Electrical Machine 1> FIG. 1 is an exemplary cross-sectional view of the configuration of the totally enclosed outer sector rotating electrical machine 1 of the embodiment.

[0012] As shown in FIG. 1, the totally enclosed outer sector rotating electrical machine 1 includes a rotating electrical machine main body 2 that performs a rotating operation and a cooler 3. Also, inside the totally enclosed outer sector rotating electrical machine 1, a closed space 4 filled with a cooling gas such as air is provided across the rotating electrical machine main body 2 and the cooler 3. The gas in the closed space 4 heated by the heat generation of the rotating electrical machine main body 2 (hereinafter also referred to as the cooling gas) is heat-exchanged with the outside air in the cooler 3, whereby the rotating electrical machine main body 2 is cooled. The totally enclosed outer sector rotating electrical machine 1 is an example of a reluctance rotating electrical machine. The cooling gas is an example of a gas.

[0013] <Configuration of the rotating electrical machine main body 2> The rotating electrical machine main body 2 is, for example, a reluctance motor (electric motor). Note that the rotating electrical machine main body 2 may be a generator.

[0014] The rotating electrical machine main body 2 includes a housing 11, a rotor 12, a stator 13, and two bearings 16.

[0015] In this specification, for convenience, an axial direction, a radial direction, and a circumferential direction are defined. The axial direction is the direction along the rotation center axis Ax1. The radial direction is the direction orthogonal to the rotation center axis Ax1. The circumferential direction is the direction of rotation around the rotation center axis Ax1.

[0016] The rotation center axis Ax1 is the center of rotation of the rotor 12 in the rotating electrical machine main body 2, and is, for example, an imaginary straight line passing through the center of the shaft 14 of the rotor 12.

[0017] The housing 11 has a frame 21 and two bearing brackets 122. The frame 21 is formed in a substantially cylindrical shape surrounding the rotation center axis Ax1. The stator 13 and a part of the rotor 12 are disposed inside the frame 21.

[0018] The two bearing brackets 122 are connected to both ends of the frame 21 in the axial direction. The bearing bracket 122 closes the space inside the frame 21. Each of the bearing brackets 122 supports the corresponding bearing 16. The bearing bracket 122 is also referred to as a wall.

[0019] The two bearings 16 are provided on the two bearing brackets 122 and are located on one side and the other side in the axial direction with respect to the rotor core 31. That is, the rotor core 31 is located between the two bearings 16.

[0020] The stator 13 has a stator core 19 and a stator winding 20. The stator core 19 is fixed to the frame 21.

[0021] FIG. 2 is an exemplary cross-sectional view of the rotating electrical machine main body 2 in the fully-closed outer-sector rotating electrical machine 1 of the embodiment.

[0022] As shown in FIGS. 1 and 2, the stator core 19 is formed in a substantially cylindrical shape surrounding the rotation center axis Ax1. As shown in FIG. 2, the stator core 19 has a plurality of stator steel plates 22 stacked axially on each other. The stator steel plate 22 is, for example, an electromagnetic steel plate and is composed of a magnetic body (magnetic material). Further, a plurality of passages 23 penetrating the stator core 19 in the radial direction are provided at intervals in the axial direction. Note that in FIG. 2, the illustration of the stator winding 20 is omitted.

[0023] As shown in FIGS. 1 and 2, the rotor 12 has a shaft 14 and a rotor core 31. A part of the rotor 12 is located inside the stator 13 and is rotatable about the rotation center axis Ax1.

[0024] As shown in FIG. 1, the shaft 14 is formed in a substantially cylindrical shape extending along the rotation center axis Ax1. The shaft 14 passes through the bearing bracket 122 and extends across the inside and outside of the housing 11. The shaft 14 is rotatably supported about the rotation center axis Ax1 by bearings 16.

[0025] The shaft 14 extends axially through the inside of the stator 13 and the rotor core 31. The shaft 14 is coupled to the rotor core 31.

[0026] The rotor core 31 is disposed inside the stator core 19. The rotor core 31 is formed in a substantially cylindrical shape surrounding the rotation center axis Ax1. That is, a hole 31a penetrating the rotor core 31 in the axial direction is provided in the rotor core 31. The shaft 14 is inserted into the hole 31a.

[0027] FIG. 3 is an exemplary perspective view of a part of the rotor core 31 of the rotating electrical machine main body 2 of the embodiment.

[0028] As shown in FIGS. 2 and 3, the rotor core 31 has a core body 50, two presser plates 52, and two shield plates 72. The presser plate 52 is also referred to as an end plate.

[0029] The core body 50 is formed in a cylindrical shape around the rotation center axis Ax1. The core body 50 is provided with a hole 50a penetrating the core body 50 in the axial direction.

[0030] The core body 50 has a plurality of rotor steel plates 51 and a plurality of partition plates 71.

[0031] The rotor steel plate 51 is an electromagnetic steel plate and is composed of a magnetic material. The rotor steel plate 51 is annular around the rotation center axis Ax1. Specifically, the rotor steel plate 51 is disk-shaped. The thickness direction of the rotor steel plate 51 is along the axial direction. The plurality of rotor steel plates 51 are stacked in the axial direction. The plurality of rotor steel plates 51 are fixed to each other by a fixing portion 60 and integrated. A shaft 14 is inserted inside the plurality of rotor steel plates 51. The rotor steel plate 51 is an example of a plate. The rotor steel plate 51 is also referred to as a blanking plate. The rotor steel plate 51 is an example of a magnetic plate. The rotor steel plate 51 is an electromagnetic steel plate and is composed of a magnetic material. The magnetic material is, for example, steel such as SS400. The rotor steel plate 51 is annular around the rotation center axis Ax1. Specifically, the rotor steel plate 51 is disk-shaped. The thickness direction of the rotor steel plate 51 is along the axial direction. The plurality of rotor steel plates 51 are stacked in the axial direction. The plurality of rotor steel plates 51 are fixed to each other by a fixing portion 60 and integrated. A shaft 14 is inserted inside the plurality of rotor steel plates 51. The rotor steel plate 51 is an example of a plate. The rotor steel plate 51 is also referred to as a blanking plate. The rotor steel plate 51 is an example of a magnetic plate.

[0032] FIG. 4 is an exemplary front view of the rotor steel plate 51 of the rotor core 31 of the embodiment. As shown in FIG. 4, a plurality of flux barrier groups 53 are provided on the rotor steel plate 51 of the core body 50 of the rotor core 31. The number of the flux barrier groups 53 matches the number of poles (six in one example) of the core body 50. The flux barrier groups 53 of the plurality of rotor steel plates 51 are arranged in the axial direction.

[0033] The plurality of flux barrier groups 53 are provided at intervals in the circumferential direction. Each flux barrier group 53 has a plurality of flux barriers 53a. Each flux barrier 53a is a through-hole (hollow portion) penetrating the core body 50 in the axial direction. In other words, the flux barrier 53a is an opening provided in the rotor steel plate 51. The flux barrier 53a is formed in a substantially arc shape along the flow of magnetic flux formed when the stator winding 20 is energized. Thereby, a portion (direction) where the magnetic flux easily flows and a portion (direction) where the magnetic flux hardly flows are formed in the rotor steel plate 51. Note that the flux barrier 53a is not limited to the above. The flux barrier 53a may be a notch.

[0034] In the rotating electrical machine main body 2, by controlling the magnetic flux flow path by the flux barrier 53a, a rotational force can be generated. That is, the rotating electrical machine main body 2 can rotate the rotor 12 by utilizing the salient pole property of the rotor core 31 without providing a permanent magnet or a winding (conductor) on the rotor 12.

[0035] Also, as shown in FIG. 4, a concave portion 51b is provided on the inner peripheral portion 51a (inner peripheral surface) of each rotor steel plate 51. The concave portion 51b penetrates the rotor steel plate 51 in the axial direction and opens toward the inner side in the radial direction of the shaft 14.

[0036] The plurality of partition plates 71 are arranged at intervals in the axial direction. The partition plate 71 is sandwiched between two adjacent rotor steel plates 51 in the axial direction. The partition plate 71 is made of, for example, a metal material.

[0037] FIG. 5 is an exemplary front view of the partition plate 71 of the rotor core 31 of the embodiment. As shown in FIG. 5, the partition plate 71 is annular around the rotation center axis Ax1. Specifically, the partition plate 71 is disc-shaped. The thickness direction of the partition plate 71 is along the axial direction. The rotor steel plate 51 is provided with a hole 71a into which the shaft 14 is inserted. Further, a concave portion 71b is provided on the inner peripheral portion 71c (inner peripheral surface) of each partition plate 71. The concave portion 71b penetrates the partition plate 71 in the axial direction and opens toward the inside in the radial direction of the shaft 14.

[0038] The partition plate 71 has a base portion 71d and a plurality of convex portions 71e. The base portion 71d is formed in an annular shape around the rotation center axis Ax1. The plurality of convex portions 71e project radially outward from the base portion 71d. The plurality of convex portions 71e are arranged at intervals in the circumferential direction of the rotation center axis Ax1. A concave portion 71f is formed between two adjacent convex portions 71e in the circumferential direction. That is, the partition plate 71 is provided with convex portions 71e and concave portions 72f alternately in the circumferential direction. The concave portion 71f penetrates the partition plate 71 in the axial direction and is open to the outside in the radial direction of the rotation center axis Ax1. The concave portion 71f is aligned axially with the flux barrier 53a, the first opening 52e described later, and the second opening 72e.

[0039] As shown in FIG. 2, the two pressing plates 52 are a pressing plate 52A and a pressing plate 52B. The pressing plate 52A is located on one axial side (the right side in FIG. 2) with respect to the core body 50 and is stacked on the rotor steel plate 51 located at one axial end among the plurality of rotor steel plates 51. The pressing plate 52B is located on the other axial side (the left side in FIG. 2) with respect to the core body 50 and is stacked on the rotor steel plate 51 located at the other axial end among the plurality of rotor steel plates 51. The two pressing plates 52 sandwich the core body 50.

[0040] FIG. 6 is an exemplary front view of the retaining plate 52 of the rotor core 31 of the embodiment. As shown in FIG. 6, the retaining plate 52 is annular around the rotation center axis Ax1. Specifically, the retaining plate 52 is disc-shaped. A hole 52a into which the shaft 14 is inserted is formed in the retaining plate 52. Further, a recess 52b is provided in the inner peripheral portion 52c (inner peripheral surface) of each retaining plate 52. The recess 52b penetrates the retaining plate 52 in the axial direction and opens toward the inside in the radial direction of the shaft 14.

[0041] Further, the retaining plate 52 is provided with a plurality of first openings 52e that penetrate the retaining plate 52 in the axial direction. The first openings 52e are arranged axially with the flux barrier 53a. The first openings 52e are holes.

[0042] The retaining plate 52 is provided with a plurality of retaining plate opening rows E1a, E1b. Each retaining plate opening row E1a, E1b is composed of a plurality of first openings 52e arranged at intervals in the circumferential direction. Further, the retaining plate opening row E1a is composed of a plurality of first openings 52ea. The retaining plate opening row E1b is located on the radially outer side of the retaining plate opening row E1b. The retaining plate opening row E1b is composed of a plurality of first openings 52eb. The number of the first openings 52eb is smaller than the number of the first openings 52ea. Further, the first openings 52e are provided for each number of poles (six in one example) of the iron core body 50. For one pole, a first opening 52e surrounded by a line L1 in FIG. 6 is provided.

[0043] As shown in FIG. 2, the two shield plates 72 are shield plate 72A and shield plate 72B. Shield plate 72A is interposed between the rotor steel plate 51 located at one end in the axial direction among the plurality of rotor steel plates 51 and the pressing plate 52A. Shield plate 72B is interposed between the rotor steel plate 51 located at the other end in the axial direction among the plurality of rotor steel plates 51 and the pressing plate 52B. The shield plate is made of a non-magnetic material (non-magnetic substance). The non-magnetic material is, for example, stainless steel (SUS). Note that the non-magnetic material is not limited to this. The shield plate 72 suppresses the magnetic flux generated in the rotor steel plate 51 from heading in the axial direction. The shield plate 72 may cover the entire end face of the rotor steel plate 51 or only a part thereof. The shield plate 72 may be configured to cover at least the outer peripheral portion of the rotor steel plate 51 where the magnetic flux is relatively strong.

[0044] FIG. 7 is an exemplary front view of the shield plate 72 of the rotor core 31 of the embodiment. As shown in FIG. 7, the shield plate 72 is annular around the rotation center axis Ax1. Specifically, the shield plate 72 is disc-shaped. A hole 72a into which the shaft 14 is inserted is formed in the shield plate 72. Further, a recess 72b is provided in the inner peripheral portion 72c (inner peripheral surface) of each shield plate 72. The recess 72b penetrates the shield plate 72 in the axial direction and opens toward the inside in the radial direction of the shaft 14.

[0045] In addition, a plurality of second openings 72e penetrating the pressing plate 52 in the axial direction are provided in the shield plate 72. The second openings 72e are axially aligned with the flux barrier 53a and the first openings 52e. The second openings 72e are holes. All the first openings 52e and all the second openings 72e are axially aligned.

[0046] The shield plate 72 is provided with a plurality of shield plate opening rows E2a and E2b. Each shield plate opening row E2a and E2b is composed of a plurality of second openings 72e arranged at intervals in the circumferential direction. Further, the shield plate opening row E2a is composed of a plurality of second openings 72ea. The shield plate opening row E2b is located radially outside the shield plate opening row E2b. The shield plate opening row E2b is composed of a plurality of second openings 72eb. The number of the second openings 72eb is smaller than the number of the second openings 72ea. Also, the second openings 72e are provided for each number of poles (for example, six) of the core body 50. For one pole, a second opening 72e surrounded by a line L2 in FIG. 7 is provided.

[0047] FIG. 8 is an exemplary plan view of a part of the rotor core 31 of the rotating electrical machine body 2 of the embodiment. FIG. 9 is an exemplary plan view of a part of the rotor core 31 of the rotating electrical machine body 2 of the embodiment.

[0048] As can be seen from FIGS. 8 and 9, the first opening 52e, the second opening 72e, the flux barrier 53a, and the recess 71f are arranged axially and communicate with each other.

[0049] Next, the coupling between the shaft 14 and the rotor core 31 will be described.

[0050] As shown in FIG. 2, the shaft 14 has a cylindrical outer peripheral surface 14a around the rotation center axis Ax1. The shaft 14 has a plurality of cylindrical regions 14b to 14e around the rotation center axis Ax1.

[0051] Region 14b is a portion located inside the rotor core 31 in the shaft 14. Region 14c is located on one axial side with respect to region 14b and is connected to region 14b. The diameter of region 14c is larger than the diameter of region 14b. As a result, a surface 12m that protrudes radially outward with respect to region 14b is formed in region 14c. The surface 12m faces the other axial side, that is, the rotor core 31 side. The surface 12m is annular around the rotation center axis Ax1.

[0052] Region 14d is located on the other axial side with respect to region 14b and is connected to region 14b. The diameter of region 14d is smaller than the diameter of region 14b.

[0053] Region 14e is located on the other axial side with respect to region 14d and is connected to region 14d. The diameter of region 14e is larger than the diameter of region 14d.

[0054] A recess 12n having the outer peripheral surface of region 14d as the bottom surface is provided between region 14b and region 14e.

[0055] The coupling between the shaft 14 and the rotor core 31 is made by a fixing portion 60. The fixing portion 60 has a surface 12m of the shaft 14 and a key 61. The surface 12m is an example of a first clamping portion, and the key 61 is an example of a second clamping portion. The key 61 is also referred to as a clamping member.

[0056] The surface 12m is located on one axial side with respect to the rotor core 31 (rotor steel plate 51). The surface 12m is aligned axially with one pressing plate 52A of the rotor core 31 and is in contact with the pressing plate 52A.

[0057] As shown in Fig. 8, a plurality of keys 61 are provided. The number of keys 61 is the same as the number of poles of the core body 50, and as an example, there are six. The plurality of keys 61 are arranged at intervals in the circumferential direction. The key 61 is formed, for example, in a rectangular parallelepiped shape. The key 61 is fixed to the shaft 14 by welding or the like in a state where it is inserted into the recess 12n of the shaft 14. The key 61 is located on the other axial side with respect to the rotor core 31 (core body 50). The key 61 is arranged axially with the other pressing plate 52B of the rotor core 31 and is in contact with the pressing plate 52B. The key 61 is located radially inside the flux barrier group 53 when viewed axially. The key 61 is located radially inside a portion of the rotor core 31 where the flux barrier group 53 is provided and has relatively low rigidity (strength), and reinforces the rotor core 31. The key 61 is connected to the surface 12m via the shaft 14 located inside the rotor core 31, that is, the region 14b.

[0058] The fixing portion 60 fixes the plurality of rotor steel plates 51 and the two pressing plates 52 to each other by sandwiching the rotor core 31 (core body 50) in the axial direction between the surface 12m and the key 61. Thereby, the plurality of rotor steel plates 51 and the two pressing plates 52 are integrated. Also, the fixing portion 60 positions the rotor core 31 in the axial direction with respect to the shaft 14. Here, the shaft 14 is press-fitted into the rotor core 31 (core body 50). That is, the rotor core 31 (core body 50) and the shaft 14 are fitted together by shrink fitting.

[0059] Also, as shown in Fig. 2, the portion 31c between the surface 12m and the key 61 in the rotor core 31 (core body 50) is solid. That is, the portion (inner peripheral portion 51c) between the surface 12m and the key 61 in each portion of the rotor steel plate 51 and the portion (inner peripheral portion 52c) between the surface 12m and the key 61 in each pressing plate 52 are solid. In other words, no hole penetrating the rotor core 31 is provided in the portion 31c between the surface 12m and the key 61 in the rotor core 31.

[0060] <Configuration of the cooler 3> As shown in FIG. 1, the cooler 3 includes a heat exchanger 131, an outer fan cover 32, and an outlet guide 33. The cooler 3 cools the inside of the housing 11.

[0061] The heat exchanger 131 is disposed above the housing 11 and mounted on the housing 11. The heat exchanger 131 includes a housing 40 and a plurality of cooling pipes 41.

[0062] The housing 40, like the housing 11, is formed in a box shape. It has an inlet end plate 42, an outlet end plate 43, a cooler cover 45, and a bottom plate 46. A space 4b is provided inside the housing 40. The space 4b constitutes a closed space 4.

[0063] The bottom plate 46 extends along a direction orthogonal to the Z direction (X - Y plane). The bottom plate 46 is located on the Z - direction side (upper side) with respect to the housing 11 of the rotary electric machine main body 2 and covers the inside of the housing 11, that is, the space 4a. The bottom plate 46 is provided with, for example, two ventilation openings 46a and, for example, two ventilation openings 46b. The ventilation opening 46a is provided at a substantially central portion of the bottom plate 46 in the X direction and is located above the stator 13. The two ventilation openings 46a are provided at intervals in the X direction. The two ventilation openings 46b are provided at intervals in the X direction. The two ventilation openings 46b are located at a portion diagonally above the inner fan 18 in the housing 11. The ventilation opening 46a is located between the two ventilation openings 46b. Each of the ventilation openings 46a and 46b communicates with the inside of the housing 40, that is, the space 4b, and the inside of the housing 11, that is, the space 4a, connecting the space 4b and the space 4a. The bottom plate 46 is an example of a covering wall. The number of the ventilation openings 46a and the ventilation openings 46b is not limited to two, and may be one, or three or more.

[0064] Both the inlet end plate 42 and the outlet end plate 43 extend along a direction (Y-Z plane) orthogonal to the axial direction, i.e., the X direction, and are provided parallel to each other with a space therebetween in the X direction. The inlet end plate 42 extends in the Z direction from the end portion of the bottom plate 46 in the direction opposite to the X direction, and the outlet end plate 43 extends in the Z direction from the end portion of the bottom wall 11a in the X direction.

[0065] The cooler cover 45 is provided across the bottom plate 46, the inlet end plate 42, and the outlet end plate 43.

[0066] The plurality of cooling pipes 41 are arranged in parallel with each other. The plurality of cooling pipes 41 are provided across the inlet end plate 42 and the outlet end plate 43, and both end portions of the cooling pipes 41 are supported by the inlet end plate 42 and the outlet end plate 43.

[0067] Also, two guide plates 44 are provided in the cooler cover 45. The two guide plates 44 are arranged with a space therebetween in the X direction between the inlet end plate 42 and the outlet end plate 43. The two guide plates 44 extend upward from the bottom of the space 4b so as to exclude the upper communication space 4c in the space 4b of the housing 40, and partition the space in the cooler cover 45 excluding the upper communication space 4c in the X direction.

[0068] The outer fan cover 32 is fixed to the inlet end plate 42 and houses the outer fan 17. The outer fan cover 32 is provided with a suction port 37, and when the outer fan 17 rotates, outside air flows into the outer fan cover 32 from the suction port 37. Also, the outer fan cover 32 is connected to the inlet end plate 42 so that the outside air flowing into the outer fan cover 32 by the outer fan 17 flows into the inside of the plurality of cooling pipes 41. Further, a guide member 49 for guiding the outside air is provided in the outer fan cover 32 so that the outside air flowing into the outer fan cover 32 from the suction port 37 passes through the outer fan 17 and flows to the plurality of cooling pipes 41.

[0069] The outlet guide 33 is fixed to the outlet end plate 43. The outlet guide 33 guides the outside air flowing out from the plurality of cooling pipes 41 to flow in a predetermined direction.

[0070] <Gas flow in the fully enclosed outer-sector rotating electrical machine 1> Next, the gas flow in the fully enclosed outer-sector rotating electrical machine 1 with the above configuration will be described.

[0071] First, the cooling gas in the closed space 4 will be described. The cooling gas in the space 4a inside the housing 11 in the closed space 4 shown in FIG. 1 is sent to the rotor 12 and the stator 13 by two inner fans 18 that rotate integrally with the shaft 14. The cooling gas flows along the rotor 12 and the stator 13 to cool the rotor 12 and the stator 13, and then flows out to the outside in the radial direction of the stator core 19. At this time, the cooling gas passes through the ventilation paths provided in the rotor 12 and the stator 13 respectively. Specifically, the cooling gas enters the recess 71f through the first opening 52e, the second opening 72e, and the flux barrier 53a. The cooling gas that has entered the recess 71f is guided to the outside in the radial direction by the convex portion 71e and flows out to the outside in the radial direction from the recess 71f. Then the cooling gas enters the passage 23 of the stator core 19 from the inside in the radial direction. The gas that has flowed out to the outside in the radial direction of the stator core 19 flows into the space 4b in the cooler 3 via the ventilation port 46a. The gas that has flowed into the space 4b of the cooler 3 rises between the two guide plates 44 while exchanging heat with the outside air flowing in the cooling pipe 41 and being cooled as it passes through the outside of the cooling pipe 41, and flows out to the upper communication space 4c.

[0072] The cooling gas in the upper communication space 4c is shunted in opposite directions to each other in the axial direction of the cooling pipe 41, and descends while exchanging heat with the outside air in the cooling pipe 41 and being cooled between the inlet end plate 42 and the guide plate 44 and between the outlet end plate 43 and the guide plate 44 respectively. Then, the cooling gas returns to the space 4a inside the housing 11 via the ventilation port 46b and flows into the inner fans 18 again.

[0073] Next, the outside air will be described. The outside air flows into the outer fan cover 32 from the suction port 37 by the outer fan 17 that rotates integrally with the shaft 14, passes through the inside of the outer fan cover 32, and reaches the inlet end plate 42. The outside air that has reached the inlet end plate 42 flows into each cooling pipe 41 that is open at the inlet end plate 42, passes through the cooling pipe 41 while receiving heat from the cooling gas outside the cooling pipe 41 and rising in temperature, and then flows out of the cooler 3 from the opening at the outlet end plate 43. In this way, heat exchange is performed between the outside air inside the cooling pipe 41 and the cooling gas outside the cooling pipe 41, thereby cooling the rotor 12 and the stator 13.

[0074] <Effects of the Embodiment> As described above, the fully-closed outer-sector rotating electric machine 1 (reluctance rotating electric machine) includes a stator 13 and a rotor 12. The rotor 12 has a shaft 14, a part of which is located inside the stator 13 and is rotatable about the rotation center axis Ax1, and a rotor core 31 located inside the stator 13 and fixed to the shaft 14. The rotor core 31 has a plurality of rotor steel plates 51 (magnetic plates), two pressing plates 52, and a shield plate 72. The plurality of rotor steel plates 51 are arranged in the axial direction of the rotation center axis Ax1, are made of a magnetic material, and are provided with flux barriers 53a. The two pressing plates 52 sandwich the plurality of rotor steel plates 51 in the axial direction. The partition plate 71 is disposed between two adjacent rotor steel plates 51 (magnetic plates) in the axial direction. The pressing plate 52 is provided with a first opening 52e that penetrates the pressing plate 52 in the axial direction and is aligned with the flux barrier 53a in the axial direction. The shield plate 72 is located between the rotor steel plate 51 located at the axial end of the plurality of rotor steel plates 51 and the pressing plate 52. The shield plate 72 is made of a non-magnetic material. The shield plate 72 is provided with a second opening 72e that penetrates the shield plate 72 in the axial direction and is aligned with the flux barrier 53a and the first opening 52e in the axial direction. The partition plate 71 is provided with a plurality of convex portions 71e spaced apart in the circumferential direction of the rotation center axis Ax1, and a concave portion 71f that penetrates the partition plate 71 in the axial direction and is open to the outside in the radial direction of the rotation center axis Ax1 and is aligned with the flux barrier 53a, the first opening 52e, and the second opening 72e in the axial direction, and they are alternately provided in the circumferential direction.

[0075] According to such a configuration, by sending the cooling gas to the first opening 52e of the pressing plate 52, the cooling gas flows from the first opening 52e of the pressing plate 52 through the second opening 72e of the shield plate 72 and the flux barrier 53a of the rotor steel plate 51 into the concave portion 71f of the partition plate 71, is guided radially outward by the convex portion 71e, and flows to the stator 13. Therefore, according to the above configuration, the stator 13 can be efficiently cooled. Further, according to the above configuration, since the shield plate 72 suppresses the magnetic flux generated in the rotor steel plate 51 from being directed in the axial direction, the leakage of magnetic flux from the rotor core 31 can be suppressed.

[0076] In addition, in the present embodiment, although the shield plate 72 is provided with the second opening 72e, since the second opening 72e is arranged axially with the flux barrier 53a where no magnetic flux is generated, magnetic flux leakage from the second opening 72e is suppressed. Further, by increasing the width (radial width) of the shield plate 72 and lengthening the distance that the magnetic flux moves along the shield plate 72, magnetic flux leakage can be further suppressed.

[0077] Further, at least a part of the plurality of convex portions 71e is arranged axially with the flux barrier 53a.

[0078] According to such a configuration, the cooling gas flowing into the concave portion 71f is more easily guided radially outward by the convex portion 71e.

[0079] In addition, the first opening 52e and the second opening 72e are holes. The pressing plate 52 is constituted by a plurality of first openings 52e arranged at intervals in the circumferential direction, and a plurality of pressing plate opening rows E1a, E1b arranged at intervals in the radial direction are provided. The shield plate 72 is constituted by a plurality of second openings 72e arranged at intervals in the circumferential direction, and a plurality of shield plate opening rows E2a, E2b arranged at intervals in the radial direction are provided.

[0080] According to such a configuration, the pressing plate opening rows E1a, E1b and the shield plate opening rows E2a, E2b can increase the amount of cooling gas flowing to the stator 13 as compared with a single configuration.

[0081] Further, the number of the first openings 52e in the plurality of pressing plate opening rows E1a, E1b is smaller as they are located more radially outward. The number of the second openings 72e in the plurality of shield plate opening rows E2a, E2b is smaller as they are located more radially outward.

[0082] According to such a configuration, it is possible to increase the cooling gas flowing into the stator 13 while suppressing a decrease in strength in a portion where the centrifugal force acting on the pressing plate 52 and the shield plate 72 is relatively large (the radially outer portion).

[0083] In each of the above embodiments, an example of the heat exchanger 131 is shown as an example of the cooling unit, but the present invention is not limited thereto. For example, the cooling unit may be an air duct that can be cooled by ventilating the inside of the housing 11.

[0084] Also, in the above embodiment, the shield plate 72 may be configured not to be provided with the pressing plate 52 by giving the shield plate 72 the same strength as the pressing plate 52.

[0085] Also, in the above embodiment, the shield plate 72 may not be provided.

[0086] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and its equivalent scope.

Explanation of Reference Numerals

[0087] 1... Totally enclosed outer sector rotating electrical machine (reluctance rotating electrical machine), 12... Rotor, 13... Stator, 14... Shaft, 31... Rotor core, 51... Rotor steel plate (magnetic plate), 52... Pressing plate, 52e... First opening, 53a... Flux barrier, 71e... Protrusion, 71f... Recess, 72... Shield plate, 72e... Second opening, Ax1... Rotation center axis, E1a, E1b... Pressing plate opening row, E2a, E2b... Shield plate opening row.

Claims

1. A stator, a shaft, a part of which is located inside the stator and is rotatable about a rotation center axis, and a rotor core located inside the stator and fixed to the shaft, comprising: wherein the rotor core includes a plurality of magnetic plates arranged in the axial direction of the rotation center axis, made of a magnetic material and provided with flux barriers, two pressing plates sandwiching the plurality of magnetic plates in the axial direction, and partition plates arranged between two adjacent magnetic plates in the axial direction, and has: the pressing plates are provided with openings penetrating the pressing plates in the axial direction and arranged in the axial direction with the flux barriers, the partition plates are provided with a plurality of convex portions spaced apart in the circumferential direction of the rotation center axis, and recesses penetrating the partition plates in the axial direction and open to the outside in the radial direction of the rotation center axis and arranged in the axial direction with the flux barriers and the openings, alternately in the circumferential direction, a reluctance rotating electric machine.

2. At least a part of the plurality of convex portions is arranged in the axial direction with the flux barriers, The reluctance rotating electric machine according to Claim 1.

3. The openings are holes, the pressing plates are provided with a plurality of opening rows arranged at intervals in the radial direction, each of which is composed of a plurality of the openings arranged at intervals in the circumferential direction, The reluctance rotating electric machine according to Claim 1.

4. The number of the openings in the plurality of opening rows decreases as the position is closer to the outside in the radial direction, The reluctance rotating electric machine according to Claim 3.

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