Reluctance rotating electric machine

Abstract

To provide a reluctance rotating electric machine having a new configuration capable of suppressing leakage magnetic flux.SOLUTION: A rotor iron core 31 of a reluctance rotating electric machine 1 includes: multiple magnetic plates 51 with a flux barrier, which are made of a magnetic material and aligned in the axis direction of a rotation center axis Ax1; two holding plates 52 sandwiching multiple magnetic plates 51 in the axial direction; and a shield plate 72 made of a non-magnetic material, which is located between the magnetic plates 51 located at the end in the axial direction out of the multiple magnetic plates 51 and the holding plate 52.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] 2. Description of the Related Art Conventionally, there is a reluctance rotating electric machine that includes a rotor core in which a plurality of annular plates are stacked in the axial direction around a central axis of rotation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-103103 Summary of the Invention [Problem to be solved by the invention]

[0004] In this type of reluctance rotating electrical machine, it would be beneficial if the generation of leakage magnetic flux could be suppressed, for example.

[0005] One example of a problem to be solved by the present invention is to provide a reluctance rotating electric machine with a novel configuration that can suppress leakage magnetic flux. [Means for solving the problem]

[0006] A reluctance rotating electric machine according to an embodiment of the present invention comprises a rotor having a stator, a shaft partly located inside the stator and rotatable around a rotation axis, and a rotor core located inside the stator and fixed to the shaft, wherein the rotor core comprises a plurality of magnetic plates arranged in the axial direction of the rotation axis and made of a magnetic material, each magnetic plate having a flux barrier provided thereon, two pressure plates sandwiching the plurality of magnetic plates in the axial direction, and a shield plate made of a non-magnetic material and located between the magnetic plate located at the end of the axial direction of the plurality of magnetic plates and the pressure plate, a spacer disposed between two of the magnetic plates adjacent to each other in the axial direction; With The pressure plate is provided with a first opening that penetrates the pressure plate in the axial direction and is aligned with the flux barrier in the axial direction, the shield plate is provided with a second opening that penetrates the shield plate in the axial direction and is aligned with the flux barrier and the first opening in the axial direction, and the spacing plate is provided with a plurality of convex portions that are spaced apart in the circumferential direction of the rotation central shaft, and recesses that penetrate the spacing plate in the axial direction, are open to the outside in the radial direction of the rotation central shaft, and are aligned with the flux barrier, the first opening, and the second opening in the axial direction, alternately provided in the circumferential direction. . [Effects of the Invention]

[0007] According to the embodiments of the present invention, it is possible to obtain a reluctance rotating electric machine with a novel configuration that can suppress leakage magnetic flux. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an exemplary cross-sectional view of a configuration of a totally enclosed outer fan rotating electric machine according to an embodiment. [Figure 2] FIG. 2 is an exemplary cross-sectional view of a rotating electric machine body in a totally enclosed outer fan rotating electric machine according to the embodiment. [Figure 3] FIG. 3 is an exemplary perspective view of a part of a rotor core of a rotating electric machine body according to the embodiment. [Figure 4] FIG. 4 is an exemplary front view of a rotor steel plate of the rotor core according to the embodiment. [Figure 5] FIG. 5 is an exemplary front view of a rotor core spacing plate according to the embodiment. [Figure 6] FIG. 6 is an exemplary front view of a rotor core retainer plate according to the embodiment. [Figure 7] FIG. 7 is an exemplary front view of a shield plate of a rotor core according to an embodiment. [Figure 8] FIG. 8 is an exemplary plan view of a part of a rotor core of a rotating electric machine body according to the embodiment. [Figure 9] FIG. 9 is an exemplary plan view of a part of a rotor core of a rotating electric machine body according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

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

[0010] Furthermore, the drawings are schematic, and the dimensional relationships and ratios of elements may differ from reality. Furthermore, the drawings may contain parts with different dimensional relationships and ratios. Furthermore, in this specification, ordinal numbers are used only to distinguish between parts, members, locations, positions, directions, etc., and do not indicate order or priority.

[0011] <Configuration of totally enclosed fan-cooled rotating electric machine 1> FIG. 1 is an exemplary cross-sectional view of a configuration of a totally enclosed fan-cooled rotating electric machine 1 according to an embodiment.

[0012] As shown in FIG. 1, a totally enclosed fan-cooled rotating electric machine 1 includes a rotating electric machine main body 2 that rotates, and a cooler 3. Inside the totally enclosed fan-cooled rotating electric machine 1, a closed space 4 filled with a cooling gas such as air is provided between the rotating electric machine main body 2 and the cooler 3. The gas in the closed space 4 (hereinafter also referred to as the cooling gas) heated by heat generated by the rotating electric machine main body 2 is heat-exchanged with outside air in the cooler 3, thereby cooling the rotating electric machine main body 2. The totally enclosed fan-cooled rotating electric machine 1 is an example of a reluctance rotating electric machine. The cooling gas is an example of a gas.

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

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

[0015] For convenience, the terms axial, radial, and circumferential are defined herein. The axial direction is the direction along the central axis of rotation Ax1. The radial direction is the direction perpendicular to the central axis of rotation Ax1. The circumferential direction is the direction of rotation around the central axis of rotation Ax1.

[0016] The rotation center axis Ax1 is the center of rotation of the rotor 12 in the rotating electrical machine 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 central rotation axis Ax1. The stator 13 and a part of the rotor 12 are disposed inside the frame 21.

[0018] Two bearing brackets 122 are connected to both axial ends of the frame 21. The bearing brackets 122 close the internal space of the frame 21. Each of the bearing brackets 122 supports a corresponding bearing 16. The bearing brackets 122 are also referred to as walls.

[0019] The two bearings 16 are provided on two bearing brackets 122 and are located on one and the other axial sides of the rotor core 31. In other words, 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 a frame 21.

[0021] FIG. 2 is an exemplary cross-sectional view of the rotating electrical machine body 2 in the totally enclosed fan-cooled rotating electrical machine 1 according to the embodiment.

[0022] As shown in FIGS. 1 and 2, the stator core 19 is formed in a generally cylindrical shape surrounding the central axis of rotation Ax1. As shown in FIG. 2, the stator core 19 has a plurality of stator steel plates 22 stacked on top of each other in the axial direction. The stator steel plates 22 are, for example, electromagnetic steel plates and are made of a magnetic body (magnetic material). The stator core 19 also has a plurality of passages 23 that penetrate the stator core 19 in the radial direction and are spaced apart in the axial direction. Note that the stator winding 20 is not shown in FIG. 2.

[0023] 1 and 2, rotor 12 has a shaft 14 and a rotor core 31. A portion of rotor 12 is located inside stator 13 and is rotatable around a central axis of rotation Ax1.

[0024] 1, the shaft 14 is formed in a generally cylindrical shape extending along the central axis of rotation Ax1. The shaft 14 passes through the bearing bracket 122 and extends between the inside and outside of the housing 11. The shaft 14 is supported by a bearing 16 so as to be rotatable around the central axis of rotation Ax1.

[0025] The shaft 14 extends in the axial direction 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 central axis of rotation Ax1. That is, the rotor core 31 is provided with a hole 31a that passes through the rotor core 31 in the axial direction. 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 body 2 of the embodiment.

[0028] 2 and 3, the rotor core 31 has a core body 50, two pressure plates 52, and two shield plates 72. The pressure plates 52 are also called end plates.

[0029] The core body 50 is formed in a cylindrical shape around the central axis of rotation Ax1. The core body 50 is provided with a hole 50a that passes through 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 spacer plates 71 .

[0031] The rotor steel plate 51 is an electromagnetic steel plate and is made of a magnetic body (magnetic material). The rotor steel plate 51 is annular about the central axis of rotation 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 multiple rotor steel plates 51 are stacked in the axial direction. The multiple rotor steel plates 51 are fixed to each other and integrated by fixing portions 60. The shaft 14 is placed inside the multiple rotor steel plates 51. The rotor steel plate 51 is an example of a plate. The rotor steel plate 51 is also called a blank 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 made of a magnetic body (magnetic material). The magnetic body is, for example, steel such as SS400. The rotor steel plate 51 is annular about the central axis of rotation 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 multiple rotor steel plates 51 are stacked in the axial direction. The multiple rotor steel plates 51 are fixed to each other and integrated by fixing portions 60. The shaft 14 is placed inside the multiple rotor steel plates 51. The rotor steel plate 51 is an example of a plate. The rotor steel plate 51 is also called a blank plate. The rotor steel plate 51 is an example of a magnetic plate.

[0032] Fig. 4 is an exemplary front view of a rotor steel plate 51 of a rotor core 31 according to an 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 flux barrier groups 53 matches the number of poles of the core body 50 (for example, six). The flux barrier groups 53 of the plurality of rotor steel plates 51 are aligned in the axial direction.

[0033] The multiple flux barrier groups 53 are spaced apart in the circumferential direction. Each flux barrier group 53 has multiple flux barriers 53a. Each flux barrier 53a is a through-hole (hollow portion) that penetrates the core body 50 in the axial direction. In other words, the flux barriers 53a are openings provided in the rotor steel plates 51. The flux barriers 53a are formed in a substantially arc shape so as to follow the flow of magnetic flux that is formed when current is applied to the stator winding 20. This forms portions (directions) in which magnetic flux flows easily and portions (directions) in which magnetic flux flows poorly in the rotor steel plates 51. Note that the flux barriers 53a are not limited to the above. The flux barriers 53a may also be cutouts.

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

[0035] 4, a recess 51b is provided in the inner peripheral portion 51a (inner peripheral surface) of each rotor steel plate 51. The recess 51b penetrates the rotor steel plate 51 in the axial direction and opens toward the inside in the radial direction of the shaft 14.

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

[0037] FIG. 5 is an exemplary front view of a spacing plate 71 of the rotor core 31 of the embodiment. As shown in FIG. 5, the spacing plate 71 is annular about the central axis of rotation Ax1. Specifically, the spacing plate 71 is disk-shaped. The thickness direction of the spacing 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. Furthermore, an inner peripheral portion 71c (inner peripheral surface) of each spacing plate 71 is provided with a recess 71b. The recess 71b penetrates the spacing plate 71 in the axial direction and opens toward the inside in the radial direction of the shaft 14.

[0038] The spacing plate 71 has a base portion 71d and multiple protrusions 71e. The base portion 71d is formed in an annular shape around the rotation center axis Ax1. The multiple protrusions 71e protrude radially outward from the base portion 71d. The multiple protrusions 71e are arranged at intervals in the circumferential direction of the rotation center axis Ax1. A recess 71f is formed between two adjacent protrusions 71e in the circumferential direction. That is, the spacing plate 71 has the protrusions 71e and the recesses 72f alternately arranged in the circumferential direction. The recess 71f penetrates the spacing plate 71 in the axial direction and opens radially outward from the rotation center axis Ax1. The recess 71f is aligned in the axial direction with the flux barrier 53a and a first opening 52e and a second opening 72e (described later).

[0039] As shown in Fig. 2, the two pressure plates 52 are pressure plate 52A and pressure plate 52B. Pressure plate 52A is located on one axial side (the right side in Fig. 2) of the core body 50 and overlaps with one of the multiple rotor steel plates 51 located at the end on one axial side. Pressure plate 52B is located on the other axial side (the left side in Fig. 2) of the core body 50 and overlaps with one of the multiple rotor steel plates 51 located at the end on the other axial side. The two pressure plates 52 sandwich the core body 50.

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

[0041] The presser plate 52 is provided with a plurality of first openings 52e that axially penetrate the presser plate 52. The first openings 52e are aligned with the flux barriers 53a in the axial direction. The first openings 52e are holes.

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

[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 a rotor steel plate 51 located at one end in the axial direction among the multiple rotor steel plates 51 and presser plate 52A. Shield plate 72B is interposed between a rotor steel plate 51 located at the other end in the axial direction among the multiple rotor steel plates 51 and presser plate 52B. The shield plates are made of a non-magnetic body (non-magnetic material). An example of the non-magnetic body is stainless steel (SUS). However, the non-magnetic body is not limited to this. Shield plate 72 prevents magnetic flux generated in rotor steel plate 51 from being directed in the axial direction. Shield plate 72 may cover the entire end face of rotor steel plate 51 or only a portion of it. Shield plate 72 may be configured to cover at least the outer periphery of rotor steel plate 51 where magnetic flux is relatively strong.

[0044] FIG. 7 is an exemplary front view of a shield plate 72 of a rotor core 31 according to an embodiment. As shown in FIG. 7, the shield plate 72 is annular about the central axis of rotation Ax1. Specifically, the shield plate 72 is disk-shaped. A hole 72a is formed in the shield plate 72, into which the shaft 14 is inserted. Furthermore, a recess 72b is provided in an 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] The shield plate 72 is also provided with a plurality of second openings 72e that penetrate the presser plate 52 in the axial direction. The second openings 72e are aligned with the flux barrier 53a and the first openings 52e in the axial direction. The second openings 72e are holes. All of the first openings 52e and all of the second openings 72e are aligned with each other in the axial direction.

[0046] The shield plate 72 is provided with a plurality of shield plate opening rows E2a, E2b. Each shield plate opening row E2a, E2b is composed of a plurality of second openings 72e spaced apart in the circumferential direction. The shield plate opening row E2a is composed of a plurality of second openings 72ea. The shield plate opening row E2b is located radially outward of the shield plate opening row E2b. The shield plate opening row E2b is composed of a plurality of second openings 72eb. The number of second openings 72eb is smaller than the number of second openings 72ea. The second openings 72e are provided for each pole of the core body 50 (for example, six). For each pole, a second opening 72e, as surrounded by 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 electric machine body 2 of the embodiment. Fig. 9 is an exemplary plan view of a part of the rotor core 31 of the rotating electric 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 aligned in the axial direction and communicate with each other.

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

[0050] 2, the shaft 14 has a cylindrical outer circumferential surface 14a around the central rotation axis Ax1, and has a plurality of columnar regions 14b to 14e around the central rotation axis Ax1.

[0051] Region 14b is a portion of shaft 14 located inside rotor core 31. Region 14c is located on one axial side of region 14b and is connected to region 14b. The diameter of region 14c is larger than the diameter of region 14b. As a result, region 14c has surface 12m that protrudes radially outward from region 14b. Surface 12m faces the other axial side, i.e., toward rotor core 31. Surface 12m is annular about central axis of rotation Ax1.

[0052] Region 14d is located on the other axial side of 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 of region 14d and is connected to region 14d. The diameter of region 14e is larger than the diameter of region 14d.

[0054] Between the region 14b and the region 14e, a recess 12n is provided, the bottom of which is the outer peripheral surface of the region 14d.

[0055] The shaft 14 and the rotor core 31 are coupled together 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 of the rotor core 31 (rotor steel plate 51). The surface 12m is aligned with one pressing plate 52A of the rotor core 31 in the axial direction and is in contact with the pressing plate 52A.

[0057] As shown in FIG. 8 , multiple keys 61 are provided. The number of keys 61 is the same as the number of poles of the core body 50, for example, six. The multiple keys 61 are arranged at intervals in the circumferential direction. The keys 61 are formed, for example, in a rectangular parallelepiped shape. The keys 61 are inserted into the recesses 12n of the shaft 14 and fixed to the shaft 14 by welding or the like. The keys 61 are located on the other axial side of the rotor core 31 (core body 50). The keys 61 are axially aligned with the other pressing plate 52B of the rotor core 31 and are in contact with the pressing plate 52B. When viewed from the axial direction, the keys 61 are located radially inward of the flux barrier group 53. The keys 61 are located radially inward of the portion of the rotor core 31 that is relatively low in rigidity (strength) due to the provision of the flux barrier group 53, thereby reinforcing the rotor core 31. The key 61 is connected to the shaft 14 located inside the rotor core 31, that is, to the surface 12m via the region 14b.

[0058] The fixing portion 60 secures the rotor steel plates 51 and the two presser plates 52 together by sandwiching the rotor core 31 (core body 50) in the axial direction between the surface 12m and the key 61. This integrates the rotor steel plates 51 and the two presser plates 52. The fixing portion 60 also determines the axial position of the rotor core 31 relative to the shaft 14. Here, the shaft 14 is press-fit into the rotor core 31 (core body 50). In other words, the rotor core 31 (core body 50) and the shaft 14 are fitted together by an interference fit.

[0059] 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 circumferential portion 51c) between the surface 12m and the key 61 in each rotor steel plate 51, and the portion (inner circumferential 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 Cooler 3> 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 is mounted on the housing 11. The heat exchanger 131 has a housing 40 and a plurality of cooling pipes 41.

[0062] The housing 40 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 forms the closed space 4.

[0063] The bottom plate 46 extends in a direction perpendicular to the Z direction (XY plane). The bottom plate 46 is located on the Z direction side (upper side) of the housing 11 of the rotating electric machine main body 2 and covers the interior of the housing 11, i.e., the space 4a. The bottom plate 46 is provided with, for example, two ventilation holes 46a and, for example, two ventilation holes 46b. The ventilation hole 46a is located in approximately the center of the bottom plate 46 in the X direction and is located above the stator 13. The two ventilation holes 46a are provided with a gap in the X direction. The two ventilation holes 46b are provided with a gap in the X direction. The two ventilation holes 46b are located in a portion of the housing 11 diagonally above the internal fan 18. The ventilation hole 46a is located between the two ventilation holes 46b. Each of the ventilation holes 46a, 46b communicates with the interior of the housing 40, i.e., the space 4b, and the interior of the housing 11, i.e., the space 4a, and connects the space 4b with the space 4a. The bottom plate 46 is an example of a covering wall. The number of the ventilation holes 46a, 46b is not limited to two, and may be one, three, or more.

[0064] The inlet end plate 42 and the outlet end plate 43 both extend in the axial direction, i.e., along a direction perpendicular to the X direction (YZ plane), and are arranged parallel to each other with a gap in the X direction. The inlet end plate 42 extends in the Z direction from the end of the bottom plate 46 opposite the X direction, and the outlet end plate 43 extends in the Z direction from the end 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 cooling pipes 41 are arranged in parallel to one another and are provided between the inlet end plate 42 and the outlet end plate 43, with both ends of the cooling pipes 41 supported by the inlet end plate 42 and the outlet end plate 43.

[0067] Two guide plates 44 are provided inside the cooler cover 45. The two guide plates 44 are arranged at a distance from each other 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 of the housing 40 so as to exclude the upper communicating space 4c, and separate the space 4b of the cooler cover 45 in the X direction, excluding the upper communicating space 4c.

[0068] The external fan cover 32 is fixed to an inlet end plate 42 and houses the external fan 17. An inlet 37 is provided in the external fan cover 32, and as the external fan 17 rotates, external air flows into the external fan cover 32 from the inlet 37. The external fan cover 32 is connected to the inlet end plate 42 so that the external air flowed into the external fan cover 32 by the external fan 17 flows inside the multiple cooling pipes 41. A guide member 49 is provided inside the external fan cover 32 to guide the external air that flows into the external fan cover 32 from the inlet 37 so that the air passes through the external fan 17 and flows into the multiple cooling pipes 41.

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

[0070] <Gas flow in totally enclosed fan-cooled rotating electric machine 1> Next, the flow of gas in the totally enclosed fan-cooled rotating electrical machine 1 having 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 in the housing 11 of the closed space 4 shown in FIG. 1 is sent to the rotor 12 and the stator 13 by two internal fans 18 that rotate integrally with the shaft 14. The cooling gas flows along the rotor 12 and the stator 13, cooling them, and then flows out radially outward from the stator core 19. At this time, the cooling gas passes through ventilation passages provided in each of the rotor 12 and the stator 13. Specifically, the cooling gas passes through the first opening 52e, the second opening 72e, and the flux barrier 53a and enters the recess 71f. The cooling gas that entered the recess 71f is guided radially outward by the protrusion 71e and flows out radially outward from the recess 71f. The cooling gas then enters the passage 23 of the stator core 19 from the radially inner side. The gas that has flowed out to the radially outer side of the stator core 19 flows through the vent hole 46a into the space 4b inside the cooler 3. As the gas that has flowed into the space 4b inside the cooler 3 passes outside the cooling pipe 41, it exchanges heat with the outside air flowing inside the cooling pipe 41 and is cooled, and then rises between the two guide plates 44 and flows out into the upper communication space 4c.

[0072] The cooling gas in the upper communication space 4c branches off into opposite directions along the axial direction of the cooling pipe 41, and flows downward between the inlet end plate 42 and the guide plate 44, and between the outlet end plate 43 and the guide plate 44, while being cooled by heat exchange with the outside air inside the cooling pipe 41. The cooling gas then returns to the space 4a inside the housing 11 through the vent 46b, and flows into the internal fans 18 again.

[0073] Next, the outside air will be described. Outside air is introduced into the external fan cover 32 from the suction port 37 by the external fan 17, which rotates integrally with the shaft 14, passes through the external 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 opens at the inlet end plate 42, receives heat from the cooling gas outside the cooling pipes 41, and passes through the cooling pipes 41 while increasing in temperature, before flowing out of the cooler 3 from the opening at the outlet end plate 43. In this way, heat exchange occurs between the outside air inside the cooling pipes 41 and the cooling gas outside the cooling pipes 41, thereby cooling the rotor 12 and the stator 13.

[0074] <Effects of the embodiment> As described above, the totally enclosed fan-cooled rotating electric machine 1 (reluctance rotating electric machine) includes the stator 13 and the rotor 12. The rotor 12 includes a shaft 14, a portion of which is located inside the stator 13 and is rotatable around the central axis of rotation Ax1, and a rotor core 31, which is located inside the stator 13 and fixed to the shaft 14. The rotor core 31 includes a plurality of rotor steel plates 51 (magnetic plates), two pressure plates 52, and a shield plate 72. The plurality of rotor steel plates 51 are aligned in the axial direction of the central axis of rotation Ax1, are made of a magnetic material, and are provided with a flux barrier 53a. The two pressure plates 52 sandwich the plurality of rotor steel plates 51 in the axial direction. The spacing plate 71 is disposed between two axially adjacent rotor steel plates 51 (magnetic plates). The pressure plate 52 has a first opening 52e that penetrates the pressure 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 pressure plate 52 and one of the rotor steel plates 51 that is located at the axial end of the multiple rotor steel plates 51. The shield plate 72 is made of a non-magnetic material. The shield plate 72 has 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 spacing plate 71 has a plurality of protrusions 71e that are spaced apart in the circumferential direction of the rotation center axis Ax1 and recesses 71f that penetrate the spacing plate 71 in the axial direction, are open radially outward from the rotation center axis Ax1, and are aligned with the flux barrier 53a, the first opening 52e, and the second opening 72e in the axial direction, alternately arranged in the circumferential direction.

[0075] With this configuration, by sending cooling gas to the first opening 52e of the presser plate 52, the cooling gas flows from the first opening 52e of the presser plate 52 through the second opening 72e of the shield plate 72 and the flux barrier 53a of the rotor steel plate 51 to the recess 71f of the spacing plate 71, is guided radially outward by the protrusion 71e, and flows to the stator 13. Therefore, with the above configuration, the stator 13 can be efficiently cooled. Furthermore, with the above configuration, the shield plate 72 prevents the magnetic flux generated in the rotor steel plate 51 from moving axially, thereby preventing leakage of magnetic flux from the rotor core 31.

[0076] In this embodiment, the shield plate 72 has the second opening 72e, which is aligned in the axial direction with the flux barrier 53a where no magnetic flux is generated, thereby suppressing magnetic flux leakage from the second opening 72e. In addition, by increasing the width (radial width) of the shield plate 72 and lengthening the distance that the magnetic flux travels along the shield plate 72, magnetic flux leakage can be further suppressed.

[0077] At least some of the protrusions 71e are aligned with the flux barrier 53a in the axial direction.

[0078] With this configuration, the cooling gas that has flowed into the recessed portion 71f is more likely to be guided radially outward by the protruding portion 71e.

[0079] The first opening 52e and the second opening 72e are holes. The presser plate 52 is provided with a plurality of presser plate opening row rows E1a, E1b, each of which is made up of a plurality of first openings 52e arranged at intervals in the circumferential direction and is arranged at intervals in the radial direction. The shield plate 72 is provided with a plurality of shield plate opening row rows E2a, E2b, each of which is made up of a plurality of second openings 72e arranged at intervals in the circumferential direction and is arranged at intervals in the radial direction.

[0080] With this configuration, the amount of cooling gas flowing to the stator 13 can be increased compared to a configuration in which there is one each of the presser plate opening rows E1a, E1b and the shield plate opening rows E2a, E2b.

[0081] Furthermore, the number of first openings 52e decreases as the pressing plate opening rows E1a, E1b are positioned radially outward, and the number of second openings 72e decreases as the shield plate opening rows E2a, E2b are positioned radially outward.

[0082] With this configuration, it is possible to increase the amount of cooling gas flowing to stator 13 while suppressing a decrease in strength of the portions (radially outer portions) of presser plate 52 and shield plate 72 where a relatively large centrifugal force acts.

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

[0084] In the above embodiment, the shield plate 72 may be provided with the same strength as the pressing plate 52, so that the pressing plate 52 is not required.

[0085] In the above embodiment, the spacing plate 71 does not have to be provided.

[0086] Although several 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 embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0087] 1... totally enclosed fan-cooled rotating motor (reluctance rotating motor), 12... rotor, 13... stator, 14... shaft, 31... rotor core, 51... rotor steel plate (magnetic plate), 52... pressure plate, 52e... first opening, 53a... flux barrier, 71e... convex portion, 71f... concave portion, 72... shield plate, 72e... second opening, Ax1... rotation center axis, E1a, E1b... pressure plate opening row, E2a, E2b... shield plate opening row.

Claims

1. A stator; a rotor including a shaft, a portion of which is located inside the stator and which is rotatable around a rotation center axis, and a rotor core, which is located inside the stator and fixed to the shaft; Equipped with The rotor core is a plurality of magnetic plates arranged in an axial direction of the central axis of rotation, the magnetic plates being made of a magnetic material and provided with flux barriers; two presser plates sandwiching the plurality of magnetic plates in the axial direction; a shield plate made of a non-magnetic material and positioned between the magnetic plate located at the end in the axial direction among the plurality of magnetic plates and the presser plate; a spacer disposed between two of the magnetic plates adjacent to each other in the axial direction; and the presser plate is provided with a first opening that penetrates the presser plate in the axial direction and is aligned with the flux barrier in the axial direction; the shield plate is provided with a second opening that penetrates the shield plate in the axial direction and is aligned with the flux barrier and the first opening in the axial direction; the spacing plate is provided with a plurality of convex portions spaced apart in a circumferential direction of the rotation central shaft, and concave portions that penetrate the spacing plate in the axial direction, are open to the outside in a radial direction of the rotation central shaft, and are aligned in the axial direction with the flux barrier, the first opening, and the second opening, alternately in a circumferential direction; Reluctance rotating electric machine.

2. The shield plates are provided on both sides of the magnetic plates in the axial direction.

2. A reluctance rotating electric machine according to claim 1.

3. The thickness of the shield plate is thinner than the thickness of the pressing plate.

2. A reluctance rotating electric machine according to claim 1.

4. At least some of the plurality of protrusions are aligned with the flux barrier in the axial direction.

2. A reluctance rotating electric machine according to claim 1.

5. the first opening and the second opening are holes; The pressure plate is provided with a plurality of pressure plate opening rows arranged at intervals in the radial direction, each row being constituted by a plurality of the first openings arranged at intervals in the circumferential direction, the shield plate is provided with a plurality of shield plate opening row rows arranged at intervals in the radial direction, each row being constituted by a plurality of the second openings arranged at intervals in the circumferential direction; 2. A reluctance rotating electric machine according to claim 1.

6. the number of the first openings in the rows of the presser plate openings is smaller toward the outer side in the radial direction, the number of the second openings in each of the plurality of shield plate opening row rows decreases toward the outer side in the radial direction; 6. A reluctance rotating electric machine according to claim 5.

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