Rotating electric machine

Abstract

To provide a rotating electric machine with a novel configuration which can reduce wind loss.SOLUTION: A rotating electric machine 1 includes a rotor 12. The rotor 12 has a rotor core 31 and rotates in a first rotation direction R1. The rotor core 31 includes a plurality of cylindrical parts 50 and a plurality of spacing pieces 55. Each of the plurality of spacing pieces 55 has a guide surface 55c which is a surface on a side of the first rotation direction R1, the guide surface at least partly facing in a direction opposite to the first rotation direction R1 as it goes outward in a radial direction of a rotation center axis. The plurality of spacing pieces 55 are provided between two cylindrical parts 50 adjacent to each other in an axial direction at intervals from each other in a circumferential direction of the rotation center axis, and a gas introduced to the inner side in the radial direction of the rotation center axis with respect to the spacing pieces 55 is guided outward in the radial direction by the guide surfaces 55c.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] 2. Description of the Related Art Conventionally, there is a rotating electric machine in which a rotor core is provided with a guide portion that guides cooling gas toward a stator located radially outward. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-220395 Summary of the Invention [Problem to be solved by the invention]

[0004] In this type of rotating electrical machine, so-called windage loss, which is mechanical loss caused by wind in the guide portion, is one of the factors that reduces the efficiency of the rotating electrical machine.

[0005] An object of the present invention is to provide a rotating electric machine with a novel configuration that can reduce windage loss. [Means for solving the problem]

[0006] A rotating electric machine according to an embodiment of the present invention comprises a rotor having a stator, a shaft with a portion located inside the stator and rotatable around a rotation axis, and a rotor core located inside the stator and fixed to the shaft, the rotor core rotating in a first rotation direction, wherein the rotor core has a plurality of cylindrical portions each cylindrical around the rotation axis and arranged at intervals in the axial direction of the rotation axis, and a plurality of guide portions each having a surface on the first rotation direction side with a guide surface at least a portion of which faces in the opposite direction to the first rotation direction as it moves radially outward from the rotation axis, the guide portions being spaced apart from each other in the circumferential direction of the rotation axis between two axially adjacent cylindrical portions, and which guide gas introduced radially inward from the rotation axis relative to the guide surface radially outward from the rotation axis by the guide surface. [Effects of the Invention]

[0007] According to the embodiment of the present invention, it is possible to obtain a rotating electric machine with a novel configuration that can reduce windage loss. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an exemplary cross-sectional view of the configuration of a rotating electric machine according to an embodiment. [Figure 2] FIG. 2 is an exemplary cross-sectional view of a rotating electric machine body in the rotating electric machine according to the embodiment. [Figure 3] FIG. 3 is an exemplary front 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 portion of a rotor core according to an embodiment. [Figure 5] FIG. 5 is an exemplary front view of a portion of a rotating electric machine of a comparative example. [Figure 6] FIG. 6 is an exemplary front view of a part of a rotor core of a rotating electric machine according to a modified example of 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 rotating electric machine 1> FIG. 1 is an exemplary cross-sectional view of the configuration of a rotating electric machine 1 according to an embodiment. As shown in FIG. 1, the rotating electric machine 1 includes a rotating electric machine main body 2 that rotates, and a cooler 3. The rotating electric machine 1 is a totally enclosed fan-cooled rotating electric machine. A closed space 4 filled with a cooling gas such as air is provided inside the rotating electric machine 1, spanning 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) that is 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. Note that the rotating electric machine 1 is not limited to the above. The cooling gas is an example of a gas.

[0012] <Configuration of rotating electrical machine main body 2> The rotating electric machine body 2 is, for example, an induction motor. However, the rotating electric machine body 2 is not limited to the above, and may be another type of rotating electric machine.

[0013] The rotating electrical machine body 2 includes a housing 11 , a rotor 12 , a stator 13 , and two bearings 16 .

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] The stator 13 has a stator core 19 and a stator winding 20. The stator core 19 is fixed to a frame 21.

[0020] FIG. 2 is an exemplary cross-sectional view of the rotating electrical machine body 2 in the rotating electrical machine 1 according to the embodiment.

[0021] 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.

[0022] As shown in Figures 1 and 2, rotor 12 has a shaft 14, a rotor core 31, and rotor conductors 15. Rotor 12 rotates in a first rotation direction R1 (Figure 3). Note that conductive bars 5 are not shown in Figure 2. A portion of rotor 12 is located inside stator 13 and is rotatable around a central rotation axis Ax1.

[0023] 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.

[0024] 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.

[0025] The rotor core 31 is disposed inside the stator core 19. The rotor core 31 is formed in a substantially cylindrical (tubular) shape surrounding the central rotation axis Ax1.

[0026] 2, the rotor core 31 has a plurality of cylindrical portions 50, two pressure plates 52, and a plurality of gap forming portions 71. The pressure plates 52 are also called end plates.

[0027] The multiple cylindrical portions 50 are arranged at intervals in the axial direction. A gap forming portion 71 is interposed between two axially adjacent cylindrical portions 50, and a gap is formed between the two axially adjacent cylindrical portions 50. Details of the gap forming portion 71 will be described later.

[0028] FIG. 3 is an exemplary front view of a portion of the rotor core 31 of the rotating electric machine main body 2 of the embodiment. As shown in FIGS. 2 and 3, the tubular portion 50 is formed in a cylindrical shape around the central axis of rotation Ax1. The shaft 14 is placed inside the tubular portion 50. The tubular portion 50 has a plurality of rotor steel plates 51 stacked on top of each other in the axial direction. The rotor steel plates 51 are annular about the central axis of rotation Ax1. Specifically, the rotor steel plates 51 are disk-shaped. The thickness direction of the rotor steel plates 51 is along the axial direction. The plurality of rotor steel plates 51 are fixed to each other and integrated. The rotor steel plates 51 are an example of plates. The rotor steel plates 51 are, for example, electromagnetic steel plates and are made of a magnetic body (magnetic material).

[0029] As shown in FIG. 3, the cylindrical portion 50 has an inner peripheral surface 50a and an outer peripheral surface 50b. The cylindrical portion 50 is provided with a plurality of recesses 50c and a plurality of ventilation holes 50e. The recesses 50c are provided on the outer peripheral surface 50b of the cylindrical portion 50 at intervals in the circumferential direction. The ventilation holes 50e are provided at intervals in the circumferential direction and are located radially inward of the recesses 50c. While FIG. 3 illustrates an example in which the ventilation holes 50e are circular, the ventilation holes 50e may have other shapes, such as a square. Although FIG. 3 illustrates an example in which the ventilation holes 50e are arranged in a row in the circumferential direction, the ventilation holes 50e may have two or more rows.

[0030] As shown in FIG. 2, the two pressure plates 52 are pressure plates 52A and 52B. The pressure plate 52A is located on one axial side (the right side in FIG. 2) of the multiple cylindrical portions 50 and overlaps the cylindrical portion 50 located at the end of one axial side of the multiple cylindrical portions 50. The pressure plate 52B is located on the other axial side (the left side in FIG. 2) of the multiple cylindrical portions 50 and overlaps the cylindrical portion 50 located at the end of the other axial side of the multiple cylindrical portions 50. The two pressure plates 52 sandwich the cylindrical portion 50. The two pressure plates 52 and the multiple cylindrical portions 50 are integrated and fixed to the shaft 14. The two pressure plates 52 are provided with a pressure plate recess that is axially aligned with the recess 50c of the cylindrical portion 50 and a pressure plate vent that is axially aligned with the vent hole 50e of the cylindrical portion 50.

[0031] As shown in FIG. 3, the rotor core 31 is provided with a plurality of slots 53 and a plurality of passages 54 .

[0032] A plurality of slots 53 are provided on the outer peripheral surface of the rotor core 31 at intervals in the circumferential direction. The slots 53 axially penetrate the rotor core 31. The slots 53 include the recesses 50c of the cylindrical portion 50 and the presser plate recesses, which are aligned in the axial direction.

[0033] The multiple passages 54 are spaced apart from one another in the circumferential direction and are located radially inward of the slots 53. The passages 54 penetrate the rotor core 31 in the axial direction. The passages 54 include the vent holes 50e of the cylindrical portion 50 and the pressure plate vent holes, which are aligned in the axial direction. Note that while FIG. 3 shows an example in which the passages 54 are circular, the shape of the passages 54 may be other shapes, such as a rectangle. Also, while FIG. 3 shows an example in which one row of the passages 54 is aligned in the circumferential direction, the row of the passages 54 may be two or more rows.

[0034] As shown in Fig. 1, the rotor conductors 15 are spaced apart from one another in the circumferential direction. The rotor conductors 15 are inserted into the slots 53 and fixed to the rotor core 31. The rotor conductors 15 are made of a conductive metal material. For example, the rotor conductors 15 include aluminum. The rotor conductors 15 are also referred to as rotor bars.

[0035] Next, the gap forming portion 71 will be described in detail. As shown in FIG. 3, the gap forming portion 71 has a plurality of spacers 55. The spacers 55 are provided between two axially adjacent cylindrical portions 50 at intervals in the circumferential direction of the rotation center axis Ax1. The spacers 55 are sandwiched between the rotor steel plates 51 of the two axially adjacent cylindrical portions 50. The spacers 55 are fixed to the axial end faces 50d of the cylindrical portions 50. The spacers 55 are made of, for example, a metal material. Two circumferentially adjacent spacers 55 form a duct (radial duct) that guides cooling gas radially outward. The spacers 55 guide gas introduced radially inward relative to the spacer 55 about the rotation center axis Ax1 through the passage 54 radially outward with one side surface 55c. The spacers 55 are an example of a guide portion.

[0036] FIG. 4 is an exemplary front view of a portion of the rotor core 31 according to the embodiment. The spacer 55 has one end 55a, the other end 55b, one side surface 55c, and the other side surface 55d. The one end 55a is the radially inner end. The other end 55b is the radially outer end. That is, the other end 55b is the end opposite to the one end 55a. The one side surface 55c is the surface on the first rotation direction R1 side, spanning the one end 55a and the other end 55b. The other side surface 55d is the surface on the opposite side of the first rotation direction R1, spanning the one end 55a and the other end 55b. The one side surface 55c is an example of a guide surface.

[0037] The spacing piece 55 also has a radially inner portion 55e and a radially outer portion 55f. The radially inner portion 55e is located radially inward relative to the radially outer portion 55f. In other words, the radially outer portion 55f is located radially outward relative to the radially inner portion 55e. The radially inner portion 55e includes one end portion 55a. The radially outer portion 55f includes the other end portion 55b.

[0038] The radially inner portion 55e is located radially inward of the slot 53 and is inclined relative to the radial direction. The radially outer portion 55f extends radially outward from the radially inner portion 55e along the radial direction and is located between two circumferentially adjacent slots 53 when viewed along the axial direction (when viewed from the axial direction). In other words, the radially outer portion 55f is located between two circumferentially adjacent rotor conductors 15.

[0039] The one side surface 55c and the other side surface 55d each have first portions 55ca, 55da and second portions 55cb, 55db. The first portions 55ca, 55da are portions of the radially inner portion 55e of the one side surface 55c and the other side surface 55d. The second portions 55cb, 55db are portions of the radially outer portion 55f of the one side surface 55c and the other side surface 55d.

[0040] The first portions 55ca and 55da are inclined radially outward from the central axis of rotation Ax1 in the opposite direction to the first rotation direction R1. The first portions 55ca and 55da are flat. The first portion 55ca is an example of an inclined surface, and the first portion 55da is an example of a back surface.

[0041] The second portions 55cb and 55db are flat surfaces extending along the radial direction.

[0042] <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.

[0043] 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.

[0044] The housing 40 is formed in a box shape. The housing 40 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.

[0045] 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.

[0046] 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.

[0047] The cooler cover 45 is provided across the bottom plate 46 , the inlet end plate 42 and the outlet end plate 43 .

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] <Gas flow in rotating electrical machine 1> Next, the flow of gas in the rotating electrical machine 1 having the above configuration will be described.

[0053] 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 the rotor 12 and the stator 13. Specifically, the cooling gas passes through the passages 54 in the rotor core 31 and reaches the gap forming portion 71 of the rotor core 31, where at least a portion of the cooling gas moves radially within the gap forming portion 71. The cooling gas that enters the gap forming portion 71 is guided radially outward by the spacer pieces 55 toward the stator 13. The cooling gas then enters the passages 23 in 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.

[0054] 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.

[0055] 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.

[0056] In the above-described flow of cooling gas, the cooling gas guided by the spacer 55 flows in one direction F toward the spacer 55, as shown in Fig. 4, for example. This one direction F is determined by, for example, a first direction Fa (flow due to rotation) tangential to the first rotational direction R1 and a second direction Fb (flow due to centrifugal force) in the radial direction. The smaller the angle between this one direction F and one side surface 55c of the spacer 55, the smaller the impact force and separation of the cooling gas with the spacer 55, and the smaller the windage loss in the spacer 55.

[0057] FIG. 5 is an exemplary front view of a portion of a rotating electric machine 1001 of a comparative example. In the rotating electric machine 1001 of the comparative example, the entire spacer 55 is aligned along the radial direction. In this configuration, the angle between the one direction F and one side surface 55c of the spacer 55 is large, approximately 90 degrees, and windage loss in the spacer 55 is likely to be large. In contrast, in the spacer 55 of the present embodiment shown in FIG. 4, the first portion 55ca, which is part of the one side surface 55c, is inclined with respect to the radial direction so as to be in the opposite direction to the first rotation direction R1 as it extends radially outward from the central axis of rotation Ax1. Therefore, the angle between the one direction F and the first portion 55ca is small. Therefore, in this embodiment, windage loss in the spacer 55 is likely to be small compared to the comparative example. In other words, the smaller the angle between the one direction F and the first portion 55ca, the easier it is for the cooling gas to flow.

[0058] <Effects of the embodiment> As described above, the rotating electric machine 1 of this embodiment 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 rotatable around the rotation axis Ax1, and a rotor core 31, which is located inside the stator 13 and fixed to the shaft 14. The rotor core 31 rotates in a first rotation direction R1. The rotor core 31 includes a plurality of cylindrical portions 50 and a plurality of spacer pieces 55 (guide portions). Each of the cylindrical portions 50 is cylindrical around the rotation axis Ax1 and is arranged at intervals in the axial direction of the rotation axis Ax1. The plurality of spacer pieces 55 have a surface on the first rotation direction R1 side, at least a portion (for example, a portion) of which has one side surface 55c (guide surface) that faces in the opposite direction to the first rotation direction as it extends radially outward from the rotation axis Ax1. The multiple spacing pieces 55 are arranged at intervals in the circumferential direction of the rotation center axis Ax1 between two axially adjacent cylindrical portions 50, and gas introduced radially inward of the rotation center axis Ax1 relative to one side surface 55c is guided radially outward by one side surface 55c.

[0059] With this configuration, at least a portion of the one side surface 55c of the spacer 55 has a shape that points in the opposite direction to the first rotation direction R1 as it moves radially outward from the rotation center axis Ax1, thereby reducing windage loss. Note that the entire one side surface 55c may also have a shape that points in the opposite direction to the first rotation direction R1 as it moves radially outward from the rotation center axis Ax1.

[0060] The first portion 55ca (inclined surface), which is a region of the side surface 55c that extends radially outward from the rotation axis Ax1 in the opposite direction to the first rotation direction R1, is a flat surface inclined relative to the radial direction. The first portion 55da, which is the back surface of the first portion 55ca in the spacer 55, is a flat surface.

[0061] With this configuration, the spacer piece 55 can be easily formed in a relatively simple shape.

[0062] The rotor core 31 also has rotor conductors 15. The rotor core 31 (cylindrical portion 50) has a plurality of slots 53, into which the rotor conductors 15 are inserted, that are arranged at intervals in the circumferential direction. The spacer 55 has a radially inner portion 55e and a radially outer portion 55f. The radially inner portion 55e is located radially inward from the slots 53 and has a first portion 51ca (inclined surface) that is a region (portion) on one side surface 55c that extends radially outward from the rotation center axis Ax1 in the opposite direction to the first rotation direction R1, and is inclined relative to the radial direction. The radially outer portion 55f extends radially outward from the radially inner portion 55e and is located between two circumferentially adjacent slots 53 when viewed along the axial direction.

[0063] With this configuration, air can be easily introduced into the passages 23 of the stator core 19.

[0064] <Modification> 6 is an exemplary front view of a portion of the rotor core 31 of the rotating electric machine 1 according to a modified example of the embodiment. As shown in FIG. 6, in this modified example, the first portion 55da, which is the back surface of the first portion 55ca of the spacer 55, has a curved surface that is convex in a direction away from the first portion 55ca. The first portion 55da is formed, for example, in the shape of the upper surface of a blade cross section.

[0065] In the above embodiment, 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.

[0066] 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]

[0067] 1...rotating electric machine (rotating electric machine), 12...rotor, 13...stator, 14...shaft, 31...rotor core, 50...cylindrical portion, 55...spacer (guide portion), 55ca...first portion (inclined surface), 55da...first portion (rear surface), Ax1...rotation center axis, R1...first rotation direction.

Claims

1. A stator; a rotor having 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, and which rotates in a first rotation direction; Equipped with The rotor core is a plurality of cylindrical portions each having a cylindrical shape around the rotation central axis and arranged at intervals in the axial direction of the rotation central axis; a plurality of guide portions each having a surface on the first rotation direction side, at least a portion of which has a guide surface that faces in an opposite direction to the first rotation direction as it moves outward in the radial direction of the rotation central axis, the guide portions being provided at intervals from each other in the circumferential direction of the rotation central axis between two of the cylindrical portions adjacent in the axial direction, and which guide gas introduced radially inward of the rotation central axis relative to the guide surface outward in the radial direction by the guide surface; It had Rotating electric motor.

2. an inclined surface, which is a region of the guide surface that extends in a direction opposite to the first rotation direction as it extends radially outward from the rotation central axis, is a flat surface inclined with respect to the radial direction, The back surface of the inclined surface of the guide portion is a flat surface. The rotating electric machine according to claim 1 .

3. an inclined surface, which is a region of the guide surface that extends in a direction opposite to the first rotation direction as it extends radially outward from the rotation central axis, is a flat surface inclined with respect to the radial direction, The back surface of the inclined surface of the guide portion is a curved surface that is convex in a direction away from the inclined surface. The rotating electric machine according to claim 1 .

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