JP2024059426A - Reluctance rotating electric machine - Google Patents

Abstract

[Problem] To obtain a reluctance rotating electric machine with a new configuration that can efficiently cool the stator. [Solution] A reluctance rotating electric machine includes a stator and a rotor. A rotor core 31 of the rotor has a plurality of magnetic plates 51, two pressing plates that axially sandwich the plurality of magnetic plates 51, and a spacer plate 71 arranged between the two magnetic plates 51. The spacer plate 71 is provided with a plurality of protrusions 71e spaced apart in the circumferential direction of the central axis of rotation, and recesses 71f that are open radially outward from the central axis of rotation, which are alternately provided in the circumferential direction. [Selected Figure] Figure 3

Description

The present invention relates to a reluctance rotating electric machine.

Conventionally, there is a reluctance rotating electric machine that has a stator and a rotor.

JP 2022-103103 A

In this type of reluctance rotating machine, it is beneficial to be able to cool the stator efficiently.

Therefore, one of the objectives of the present invention is to provide a reluctance rotating electric machine with a new configuration that can efficiently cool the stator.

The reluctance rotating electric machine according to an embodiment of the present invention includes a rotor having a stator, a shaft that is partially located inside the stator and can rotate around a rotation axis, and a rotor core that is located inside the stator and fixed to the shaft. The rotor core includes a plurality of magnetic plates that are arranged in the axial direction of the rotation axis and are made of a magnetic material and are provided with a flux barrier, two pressure plates that sandwich the plurality of magnetic plates in the axial direction, and a spacer plate that is arranged between the two magnetic plates adjacent in the axial direction. The pressure plate has an opening that penetrates the pressure plate in the axial direction and is aligned with the flux barrier in the axial direction, and the spacer plate has a plurality of protrusions that are spaced apart in the circumferential direction of the rotation axis, and recesses that penetrate the spacer in the axial direction and are open to the radial outside of the rotation axis and are aligned with the flux barrier and the opening in the axial direction, which are alternately provided in the circumferential direction.

According to an embodiment of the present invention, it is possible to obtain a reluctance rotating electric machine with a new configuration that can efficiently cool the stator.

FIG. 1 is an exemplary cross-sectional view of a configuration of a totally enclosed fan-cooled rotating electric machine according to an embodiment. FIG. 2 is an exemplary cross-sectional view of a rotating electric machine body in a totally enclosed fan-cooled rotating electric machine according to the embodiment. FIG. 3 is an exemplary perspective view of a portion of a rotor core of a rotating electric machine body according to the embodiment. FIG. 4 is an exemplary front view of a rotor steel plate of a rotor core according to an embodiment. FIG. 5 is an exemplary front view of a rotor core spacing plate according to an embodiment. FIG. 6 is an exemplary front view of a rotor core retainer plate according to an embodiment. FIG. 7 is an exemplary front view of a shield plate of a rotor core according to an embodiment. FIG. 8 is an exemplary plan view of a portion of a rotor core of a rotating electric machine body according to the embodiment. FIG. 9 is an exemplary plan view of a portion of a rotor core of a rotating electric machine body according to an embodiment.

Below, exemplary embodiments of the present invention are disclosed. The configurations of the embodiments shown below, and the actions and effects brought about by said configurations, are merely examples. The present invention can also be realized with 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.

The drawings are schematic, and the dimensional relationships and ratios of each element may differ from reality. The drawings may also include parts with different dimensional relationships and ratios. In this specification, ordinal numbers are used only to distinguish between parts, members, locations, positions, directions, etc., and do not indicate order or priority.

<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.

As shown in FIG. 1, the 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 that is heated by the heat generated by the rotating electric machine main body 2 (hereinafter also referred to as the cooling gas) 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.

<Configuration of Rotating Electric Machine Body 2>
The rotating electrical machine body 2 is, for example, a reluctance motor (electric motor). The rotating electrical machine body 2 may also be a generator.

The rotating electric machine body 2 comprises a housing 11, a rotor 12, a stator 13, and two bearings 16.

In this specification, for convenience, the axial direction, radial direction, and circumferential direction are defined. 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.

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

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

Two bearing brackets 122 are connected to both ends of the frame 21 in the axial direction. The bearing brackets 122 close the space inside the frame 21. Each of the bearing brackets 122 supports a corresponding bearing 16. The bearing brackets 122 are also referred to as walls.

The two bearings 16 are mounted on two bearing brackets 122 and are located on one axial side and the other axial side of the rotor core 31. In other words, the rotor core 31 is located between the two bearings 16.

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

Figure 2 is an exemplary cross-sectional view of the rotating electric machine body 2 in a totally enclosed fan-cooled rotating electric machine 1 according to an embodiment.

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 windings 20 are not shown in Fig. 2.

As shown in Figures 1 and 2, the rotor 12 has a shaft 14 and a rotor core 31. A portion of the rotor 12 is located inside the stator 13 and can rotate around the central axis of rotation Ax1.

As shown in FIG. 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 the bearing 16 so as to be rotatable around the central axis of rotation Ax1.

The shaft 14 extends axially through the inside of the stator 13 and the rotor core 31. The shaft 14 is connected to the rotor core 31.

The rotor core 31 is disposed inside the stator core 19. The rotor core 31 is formed in a generally cylindrical shape surrounding the central axis of rotation Ax1. That is, the rotor core 31 has a hole 31a that penetrates the rotor core 31 in the axial direction. The shaft 14 is inserted into the hole 31a.

Figure 3 is an exemplary perspective view of a portion of the rotor core 31 of the rotating electric machine body 2 of the embodiment.

As shown in Figures 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.

The core body 50 is formed in a cylindrical shape around the central axis of rotation Ax1. The core body 50 has a hole 50a that penetrates the core body 50 in the axial direction.

The core body 50 has multiple rotor steel plates 51 and multiple spacing plates 71.

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 around 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 rotor steel plates 51 are stacked in the axial direction. The rotor steel plates 51 are fixed to each other and integrated by the fixing portion 60. The shaft 14 is inserted inside the 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 around 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 the fixing parts 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.

Figure 4 is an exemplary front view of the rotor steel plate 51 of the rotor core 31 of the embodiment. As shown in Figure 4, the rotor steel plate 51 of the core body 50 of the rotor core 31 is provided with multiple flux barrier groups 53. The number of flux barrier groups 53 matches the number of poles of the core body 50 (six, as an example). The flux barrier groups 53 of the multiple rotor steel plates 51 are aligned in the axial direction.

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 barrier 53a is an opening provided in the rotor steel plate 51. The flux barrier 53a is 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. As a result, the rotor steel plate 51 is formed with parts (directions) in which magnetic flux flows easily and parts (directions) in which magnetic flux does not flow easily. Note that the flux barrier 53a is not limited to the above. The flux barrier 53a may be a notch.

The rotating electric machine body 2 can generate a rotational force by controlling the flow path of the magnetic flux with the flux barrier 53a. In other words, the rotating electric machine body 2 can rotate the rotor 12 by utilizing the salient pole of the rotor core 31 without providing permanent magnets or windings (conductors) on the rotor 12.

As shown in FIG. 4, the inner peripheral portion 51a (inner peripheral surface) of each rotor steel plate 51 is provided with a recess 51b. 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.

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

Figure 5 is an exemplary front view of the spacing plate 71 of the rotor core 31 of the embodiment. As shown in Figure 5, the spacing plate 71 is annular around 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. In addition, a recess 71b is provided on the inner peripheral portion 71c (inner peripheral surface) of each spacing plate 71. 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.

The spacing plate 71 has a base portion 71d and a plurality of protrusions 71e. The base portion 71d is formed in an annular shape around the rotation center axis Ax1. The plurality of protrusions 71e protrude radially outward from the base portion 71d. The plurality of 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 protrusions 71e and recesses 72f alternately provided 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, a first opening 52e described below, and a second opening 72e.

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 (right side in FIG. 2) of the core body 50 and is overlapped with the rotor steel plate 51 located at the end of one axial side among the multiple rotor steel plates 51. Pressure plate 52B is located on the other axial side (left side in FIG. 2) of the core body 50 and is overlapped with the rotor steel plate 51 located at the end of the other axial side among the multiple rotor steel plates 51. The two pressure plates 52 sandwich the core body 50.

Figure 6 is an exemplary front view of the pressing plate 52 of the rotor core 31 of the embodiment. As shown in Figure 6, the pressing plate 52 is annular about the central axis of rotation Ax1. Specifically, the pressing plate 52 is disk-shaped. The pressing plate 52 has a hole 52a formed therein into which the shaft 14 is inserted. In addition, a recess 52b is provided on the inner peripheral portion 52c (inner peripheral surface) of each pressing plate 52. The recess 52b penetrates the pressing plate 52 in the axial direction and opens toward the inside in the radial direction of the shaft 14.

The pressing plate 52 is provided with a plurality of first openings 52e that penetrate the pressing plate 52 in the axial direction. The first openings 52e are aligned with the flux barrier 53a in the axial direction. The first openings 52e are holes.

The pressure plate 52 has 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 outside 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 less 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 surrounded by a line L1 in FIG. 6.

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

Figure 7 is an exemplary front view of a shield plate 72 of a rotor core 31 of an embodiment. As shown in Figure 7, the shield plate 72 is annular about the central axis of rotation Ax1. Specifically, the shield plate 72 is disk-shaped. The shield plate 72 has a hole 72a formed therein into which the shaft 14 is inserted. In addition, a recess 72b is provided on 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.

The shield plate 72 also has a plurality of second openings 72e that penetrate the pressing 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.

The shield plate 72 has 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 arranged at intervals 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 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 second openings 72eb is less 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 is provided, as surrounded by a line L2 in FIG. 7.

Figure 8 is an exemplary plan view of a portion of the rotor core 31 of the rotating electric machine body 2 of the embodiment. Figure 9 is an exemplary plan view of a portion of the rotor core 31 of the rotating electric machine body 2 of the embodiment.

As can be seen from Figures 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.

Next, we will explain the connection between the shaft 14 and the rotor core 31.

As shown in FIG. 2, the shaft 14 has a cylindrical outer circumferential surface 14a around the central axis of rotation Ax1. The shaft 14 has multiple cylindrical regions 14b to 14e around the central axis of rotation Ax1.

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 is formed with 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 around central axis of rotation Ax1.

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.

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.

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

The shaft 14 and the rotor core 31 are connected by a fixing part 60. The fixing part 60 has a surface 12m of the shaft 14 and a key 61. The surface 12m is an example of a first clamping part, and the key 61 is an example of a second clamping part. The key 61 is also referred to as a clamping member.

Surface 12m is located on one axial side of rotor core 31 (rotor steel plate 51). Surface 12m is aligned with one of the pressure plates 52A of rotor core 31 in the axial direction and is in contact with said pressure plate 52A.

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 is six as an example. 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 inserted into the recess 12n of the shaft 14 and fixed to the shaft 14 by welding or the like. The key 61 is located on the other axial side of the rotor core 31 (core body 50). The key 61 is aligned in the axial direction with the other pressing plate 52B of the rotor core 31 and is in contact with the pressing plate 52B. When viewed from the axial direction, the key 61 is located radially inward of the flux barrier group 53. The key 61 is located radially inward of the portion of the rotor core 31 that has a relatively low rigidity (strength) due to the provision of the flux barrier group 53 in the rotor core 31, and reinforces the rotor core 31. The key 61 is connected to the shaft 14 located inside the rotor core 31, i.e., to the face 12m via the area 14b.

The fixing part 60 fixes the rotor steel plates 51 and the two pressure plates 52 together by axially sandwiching the rotor core 31 (core body 50) between the surface 12m and the key 61. This integrates the rotor steel plates 51 and the two pressure plates 52. The fixing part 60 also determines the axial position of the rotor core 31 relative to the shaft 14. Here, the shaft 14 is press-fitted 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 a tight fit.

Also, as shown in FIG. 2, the portion 31c between the face 12m and the key 61 in the rotor core 31 (core body 50) is solid. That is, the portion between the face 12m and the key 61 in each rotor steel plate 51 (inner periphery 51c) and the portion between the face 12m and the key 61 in each pressing plate 52 (inner periphery 52c) are solid. In other words, the portion 31c between the face 12m and the key 61 in the rotor core 31 does not have a hole penetrating the rotor core 31.

<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.

The heat exchanger 131 is disposed on the upper side of 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.

The housing 40 is formed in a box shape, as is the housing 11. 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 the closed space 4.

The bottom plate 46 extends along a direction perpendicular to the Z direction (X-Y 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 inside 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 provided in the approximate 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 the housing 11 diagonally above the inner 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., space 4b, and the interior of the housing 11, i.e., space 4a, and connects space 4b and space 4a. The bottom plate 46 is an example of a covering wall. The number of ventilation holes 46a and 46b is not limited to two, and may be one, three, or more.

The inlet end plate 42 and the outlet end plate 43 both extend along the axial direction, i.e., along a direction perpendicular to the X direction (Y-Z 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.

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

The cooling pipes 41 are arranged in parallel to one another. The cooling pipes 41 are provided across the inlet end plate 42 and the outlet end plate 43, and both ends of the cooling pipes 41 are supported by the inlet end plate 42 and the outlet end plate 43.

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 communication space 4c in the space 4b, and divide the space 4b of the cooler cover 45 in the X direction, excluding the upper communication space 4c.

The external fan cover 32 is fixed to the inlet end plate 42 and houses the external fan 17. The external fan cover 32 is provided with an inlet 37, 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 also connected to the inlet end plate 42 so that the external air flowing into the external fan cover 32 by the external fan 17 flows inside the multiple cooling pipes 41. A guide member 49 is also 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 it passes through the external fan 17 and flows into the multiple cooling pipes 41.

The outlet guide 33 is fixed to the outlet end plate 43. The outlet guide 33 guides the outside air flowing out of the multiple cooling tubes 41 so that it flows in a predetermined direction.

<Gas flow in totally enclosed fan-cooled rotating electric machine 1>
Next, the flow of gas in the totally enclosed fan-cooled rotating electric machine 1 having the above configuration will be described.

First, the cooling gas in the closed space 4 will be described. The cooling gas in the space 4a in the housing 11 in 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 to cool the rotor 12 and the stator 13, and then flows out radially outward from the stator core 19. At this time, the cooling gas passes through the ventilation paths provided in each of the rotor 12 and the stator 13. In detail, 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 has entered the recess 71f is guided radially outward by the convex portion 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 flows out to the radial outside of the stator core 19 flows into the space 4b inside the cooler 3 via the vent 46a. As the gas flows into the space 4b of the cooler 3, it exchanges heat with the outside air flowing inside the cooling pipe 41 and is cooled while passing outside the cooling pipe 41, and then rises between the two guide plates 44 and flows out into the upper communication space 4c.

The cooling gas in the upper communication space 4c branches off in opposite directions along the axial direction of the cooling pipe 41, and flows down 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 in the cooling pipe 41. The cooling gas then returns to the space 4a in the housing 11 through the vent 46b, and flows back into the internal fans 18.

Next, the outside air will be described. The outside air flows into the outside fan cover 32 from the suction port 37 by the outside fan 17 that rotates together with the shaft 14, passes through the inside of the outside fan cover 32, and reaches the inlet end plate 42. The outside air that reaches 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 pipe 41 in the cooling pipe 41, passes through the cooling pipe 41 while increasing in temperature, and then flows out of the cooler 3 from the opening at the outlet end plate 43. In this way, heat is exchanged 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.

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 the shaft 14, a part of which is located inside the stator 13 and can rotate around the rotation axis Ax1, and the 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 pressing plates 52, and a shield plate 72. The rotor steel plates 51 are aligned in the axial direction of the rotation axis Ax1, are made of a magnetic material, and are provided with a flux barrier 53a. The two pressing plates 52 sandwich the rotor steel plates 51 in the axial direction. The spacing plate 71 is disposed between two rotor steel plates 51 (magnetic plates) adjacent to each other in the axial direction. The pressing plate 52 includes 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 multiple 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 spacing plate 71 is provided with a plurality of protrusions 71e positioned at intervals in the circumferential direction of the rotation central axis Ax1, and recesses 71f that penetrate the spacing plate 71 in the axial direction, are open to the outside in the radial direction of the rotation central axis Ax1, and are aligned with the flux barrier 53a, the first opening 52e, and the second opening 72e in the axial direction, alternately provided in the circumferential direction.

According to this configuration, by sending 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 to the recess 71f of the spacing plate 71, is guided radially outward by the protrusion 71e, and flows to the stator 13. Therefore, according to the above configuration, the stator 13 can be efficiently cooled. Also, according to the above configuration, the shield plate 72 prevents the magnetic flux generated in the rotor steel plate 51 from moving in the axial direction, so leakage of magnetic flux from the rotor core 31 can be suppressed.

In this embodiment, the shield plate 72 is provided with a 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.

In addition, at least some of the multiple protrusions 71e are aligned in the axial direction with the flux barrier 53a.

With this configuration, the cooling gas that flows into the recess 71f is more easily guided radially outward by the protrusion 71e.

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

This configuration allows for a greater amount of cooling gas to flow to the stator 13 than a configuration with one each of pressure plate opening rows E1a, E1b and shield plate opening rows E2a, E2b.

In addition, the number of first openings 52e is smaller in the multiple pressure plate opening rows E1a, E1b as they are positioned radially outward.The number of second openings 72e is smaller in the multiple shield plate opening rows E2a, E2b as they are positioned radially outward.

This configuration makes it possible to increase the amount of cooling gas flowing to the stator 13 while suppressing a decrease in strength in the portions of the pressure plate 52 and the shield plate 72 where the centrifugal force acting thereon is relatively large (the radially outer portions).

In each of the above 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 inside of the housing 11 by ventilating the inside of the housing 11.

In addition, in the above embodiment, the shield plate 72 may be provided with the same strength as the pressure plate 52, so that the pressure plate 52 is not required.

In addition, in the above embodiment, the shield plate 72 does not need to be provided.

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 implemented in various other forms, and various omissions, substitutions, and modifications 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 included in the scope of the invention and its equivalents described in the claims.

1... totally enclosed fan-cooled rotating electric machine (reluctance rotating electric machine), 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 (4)

A stator;
a rotor including a shaft, a portion of which is located inside the stator and rotatable around a central axis of rotation, 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 each having a flux barrier;
Two pressing plates sandwiching the plurality of magnetic plates in the axial direction;
a spacer disposed between two of the magnetic plates adjacent to each other in the axial direction;
having
The presser plate has an opening penetrating the presser plate in the axial direction and aligned with the flux barrier 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 with the flux barrier and the opening in the axial direction, alternately in a circumferential direction.
Reluctance rotating electric machine. At least a portion of the plurality of protrusions is aligned with the flux barrier in the axial direction.
2. A reluctance rotating electric machine according to claim 1. the opening is a hole,
The pressing plate is provided with a plurality of opening rows arranged at intervals in the radial direction, each of which is constituted by a plurality of the openings arranged at intervals in the circumferential direction,
2. A reluctance rotating electric machine according to claim 1. The number of the openings in the rows of the openings is smaller toward the outer side in the radial direction.
4. A reluctance rotating electric machine according to claim 3.

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