Rotating electric machines

Abstract

To provide a rotary electric machine enabling the cooling efficiency of the rotor thereof to be improved.SOLUTION: A rotary electric machine includes: a housing; a stator; a shaft rotatable around a rotary shaft surrounded by the stator; a rotor which is mounted to the shaft and has a salient pole extended in a radial direction of the rotary shaft between the stator and the shaft and a winding wire wound around the salient pole; and a barrier which protrudes toward the stator from the surface of the rotor. The winding wire has a first portion, a second portion, a third portion and a fourth portion, is equipped with a first passage opened at both radial ends of the first portion through the first portion. The salient pole is positioned between the first portion and the second portion in a circumferential direction, and positioned between the third portion and the fourth portion in the axial direction. The first passage is positioned between the salient pole and the barrier in the circumferential direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Conventionally, rotating electric machines equipped with salient-pole rotors have been known. In a salient-pole rotor, multiple salient poles protrude from the center of the rotor, and windings are wound around each of the salient poles. When a current flows through the windings, they generate magnetic force and heat. The windings can be cooled, for example, by airflow generated inside the rotating electric machine as the rotor rotates. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 164024 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional rotating electric machines, air flows along the surfaces of the salient poles and windings to cool the windings. However, separation of the airflow can occur on the rear side of each of the salient poles in the rotational direction, reducing the cooling efficiency of the rotor.

[0005] One example of a problem to be solved by the present invention is to provide a rotating electric machine capable of improving the cooling efficiency of a rotor. [Means for solving the problem]

[0006] A rotating electric machine according to an embodiment of the present invention includes a housing, a stator housed in the housing, a shaft rotatable around a rotation axis surrounded by the stator, salient poles extending in a radial direction of the rotation axis between the stator and the shaft, and windings wound around the salient poles, the rotor being attached to the shaft, and a barrier protruding from a surface of the rotor towards the stator, wherein the windings have a first portion, a second portion spaced from the first portion in a circumferential direction around the rotation axis, and a barrier protruding from a surface of the rotor towards the stator. a third portion connecting one end of the second portion in the axial direction to the other end of the first portion in the axial direction, and a fourth portion connecting the other end of the first portion in the axial direction to the other end of the second portion in the axial direction, wherein a first passage is provided that penetrates the first portion and opens at both ends of the first portion in the radial direction, the salient pole is located between the first portion and the second portion in the circumferential direction, and is located between the third portion and the fourth portion in the axial direction, and the first passage is located between the salient pole and the barrier in the circumferential direction. The winding has a spiral conductor and a spiral insulator stacked in the radial direction, and the barrier is a part of the conductor. . [Effects of the Invention]

[0007] According to the rotating electric machine of the present invention, it is possible to obtain a rotating electric machine capable of improving the cooling efficiency of the rotor. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view of a rotating electrical machine according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the rotor of the first embodiment. [Figure 3] FIG. 3 is a cross-sectional view of the rotor of the first embodiment taken along line AA in FIG. [Figure 4] FIG. 4 is a cross-sectional view of the rotor of the first embodiment taken along line BB in FIG. [Figure 5] FIG. 5 is a cross-sectional view of a rotor according to the second embodiment. [Figure 6] FIG. 6 is a cross-sectional view of a rotor according to the third embodiment. [Figure 7] FIG. 7 is a perspective view of a rotor according to the third embodiment. [Figure 8] FIG. 8 is a perspective view of a first modified example of the rotor of the third embodiment. [Figure 9] FIG. 9 is a perspective view of a second modified example of the rotor of the third embodiment. [Figure 10] FIG. 10 is a cross-sectional view of a second modified example of the rotor of the third embodiment. [Figure 11] FIG. 11 is a cross-sectional view of a modified example 2-1 of the rotor of the third embodiment. [Figure 12] FIG. 12 is a cross-sectional view of a rotor according to the fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] The rotating electric machine 1 according to this embodiment will be described below with reference to the drawings. The configuration of the embodiment described below, and the actions and results (effects) brought about by this configuration are merely examples, and are not limited to the following description.

[0010] Furthermore, multiple embodiments disclosed below include similar components. Therefore, in the following, the similar components are given common reference numerals, and duplicate descriptions will be omitted. Note that in this specification, ordinal numbers are used only to distinguish between parts and components, and do not indicate order or priority.

[0011] First Embodiment FIG. 1 is a cross-sectional view of a rotating electric machine 1 according to a first embodiment. The rotating electric machine 1 of this embodiment is, for example, a salient-pole synchronous machine. As shown in FIG. 1, the rotating electric machine 1 includes a housing 2, a stator 3, a shaft 4, a rotor 5, and two bearings 7. However, the rotating electric machine 1 is not limited to this example.

[0012] In the following drawings, for convenience, three mutually orthogonal directions are defined. The X direction is a direction along the longitudinal direction of the housing 2 and may also be referred to as the front-to-rear direction. The Y direction is a direction along the lateral direction of the housing 2 and may also be referred to as the left-to-right direction. The Z direction is a direction along the vertical direction of the housing 2 and may also be referred to as the up-to-down direction. Note that the expressions indicating directions such as front-to-rear, left-to-right, up-to-down, etc. in this embodiment are names for convenience and do not limit the position, posture, or usage mode of the rotating electric machine 1.

[0013] The rotating electric machine 1 of this embodiment is, for example, a totally enclosed rotating electric machine. Therefore, a closed space that is separated from the outside of the housing 2 is provided inside the housing 2. However, the rotating electric machine 1 is not limited to this example. For example, the rotating electric machine 1 may be an open type rotating electric machine.

[0014] The housing 2 is formed in a box shape from metal or the like. The housing 2 houses a stator 3 and a rotor 5. Openings 21 that open in the X direction are provided at both ends of the housing 2 in the front-rear direction (X direction).

[0015] The stator 3 has a stator core 31 and a stator winding 32. The stator core 31 is fixed to the housing 2. The stator core 31 is located radially outside the rotor 5 and is formed in a cylindrical shape surrounding the rotor 5. The stator winding 32 is fixed to the stator core 31, passing through a plurality of slots (not shown) formed in an inner peripheral portion 31a of the stator core 31 so as to extend in the axial direction.

[0016] The shaft 4 is supported by the housing 2 via two bearings 7 so as to be rotatable around a rotation axis Ax surrounded by the stator 3. In other words, the two bearings 7 support the shaft 4 so as to be rotatable relative to the housing 2. The rotation axis Ax is, for example, the central axis (center line) of the shaft 4. Note that the rotation axis Ax may be different from the central axis of the shaft 4.

[0017] In the following description, for convenience, the axial direction, radial direction, and circumferential direction of the rotation axis Ax are defined. The axial direction is the direction along the rotation axis Ax. The radial direction is the direction perpendicular to the rotation axis Ax. The circumferential direction is the direction around the rotation axis Ax. In the following description, unless otherwise specified, the axial direction, radial direction, and circumferential direction are the axial direction, radial direction, and circumferential direction of the rotation axis Ax.

[0018] The shaft 4 extends in the axial direction along the rotation axis Ax so as to pass through the opening 21 of the housing 2. The portion of the shaft 4 between both axial ends 4a, 4b is housed in the housing 2. On the other hand, both axial ends 4a, 4b of the shaft 4 protrude from the housing 2 to the outside.

[0019] One end 4a is connected to various connection targets, for example. An outer fan is fixed to the other end 4b. The outer fan is covered with an outer fan cover, for example, and rotates integrally with the shaft 4.

[0020] An inner fan 41 is fixed to the shaft 4 between each of the two bearings 7 and the rotor 5. The inner fan 41 rotates integrally with the shaft 4, and circulates a cooling gas in the closed space.

[0021] Fig. 2 is a cross-sectional view of the rotor 5 according to the first embodiment. As shown in Fig. 2, the rotor 5 has a rotor core 51, a plurality of rotor windings 52, a plurality of pole heads 53, a plurality of insulating layers 54, and a plurality of brackets 55. The rotor windings 52 are an example of a winding.

[0022] 1, rotor core 51 is attached to a portion of shaft 4 between both axial ends 4a, 4b. Therefore, rotor core 51 is housed in housing 2 and rotates integrally with shaft 4.

[0023] 2, the rotor core 51 has a central portion 510 and four salient poles 511. The central portion 510 is attached to the shaft 4. The salient poles 511 protrude radially outward from the central portion 510 toward the inner circumferential portion 31a of the stator core 31 in four radial directions. In other words, the salient poles 511 extend in the radial direction of the rotation axis Ax between the stator 3 and the shaft 4.

[0024] The rotor winding 52 is wound around the side surface 511a of the salient pole 511 of the rotor core 51. In other words, the rotor winding 52 surrounds the salient pole 511. The side surface 511a is the outer surface of the salient pole 511 facing in a direction (e.g., the axial direction and the circumferential direction) intersecting the direction in which the salient pole 511 extends. The rotor winding 52 is fixed to the salient pole 511 by, for example, a bracket 55.

[0025] Rotor winding 52 has conductor 521 and insulator 522. Rotor winding 52 further has a plurality of holes 523. Holes 523 are an example of first passages.

[0026] Each of the conductor 521 and the insulator 522 is formed in a spiral shape that winds around the side surface 511a of the salient pole 511. The conductor 521 and the insulator 522 are layered so as to be alternately arranged in the radial direction. That is, the rotor winding 52 has a layered structure of the spiral conductor 521 and the spiral insulator 522 that are layered in the radial direction.

[0027] The conductor 521 is formed of, for example, a plurality of substantially flat plates made of metal or the like and extending in a direction along the rotation axis Ax. The plurality of plates of the conductor 521 are joined in a spiral shape by, for example, welding. The insulator 522 is formed of, for example, a synthetic resin or the like and is formed in a shape similar to that of the conductor 521.

[0028] Fig. 3 is a cross-sectional view of the rotor 5 taken along line AA in Fig. 2. As shown in Fig. 3, for example, the rotor winding 52 has a first portion 52a, a second portion 52b, a third portion 52c, and a fourth portion 52d. Each of the first portion 52a, the second portion 52b, the third portion 52c, and the fourth portion 52d has a portion of a conductor 521 and a portion of an insulator 522. In each of the first portion 52a, the second portion 52b, the third portion 52c, and the fourth portion 52d, the conductor 521 and the insulator 522 are stacked in the radial direction.

[0029] In the example of FIG. 3, the first portion 52a constitutes the left side (+Y direction) of the rotor winding 52. The first portion 52a is adjacent to the salient pole 511 in one circumferential direction. In the example of FIG. 3, the second portion 52b constitutes the right side (-Y direction) of the rotor winding 52. The second portion 52b is adjacent to the salient pole 511 in the other circumferential direction. Therefore, the second portion 52b is positioned away from the first portion 52a in the circumferential direction about the rotation axis Ax.

[0030] The width of the first portion 52a in the circumferential direction is greater than the width of the second portion 52b in the circumferential direction. Note that the widths of the first portion 52a and the second portion 52b are not limited to this example.

[0031] 3, the third portion 52c constitutes the front (+X direction) portion of the rotor winding 52. The third portion 52c is adjacent to one axial direction of the salient pole 511. The third portion 52c connects one axial end 52a1 of the first portion 52a and one axial end 52b1 of the second portion 52b.

[0032] 3, the fourth portion 52d constitutes a rear portion (-X direction) of the rotor winding 52. The fourth portion 52d is adjacent to the salient pole 511 in the other axial direction. The fourth portion 52d connects the other axial end 52a2 of the first portion 52a and the other axial end 52b2 of the second portion 52b.

[0033] The salient pole 511 is located between the first portion 52a and the second portion 52b in the circumferential direction, and between the third portion 52c and the fourth portion 52d in the axial direction. In this manner, the rotor winding 52 surrounds the salient pole 511.

[0034] In this embodiment, the rotor 5 rotates, for example, in a clockwise direction in Fig. 2. The holes 523 are provided in the first portion 52a adjacent to the salient pole 511 on the side opposite to the rotation direction of the rotor 5. However, the positions of the holes 523 are not limited thereto and may be changed as appropriate.

[0035] The multiple holes 523 are spaced apart from the salient poles 511 of the rotor core 51. Instead of the holes 523, notches adjacent to the salient poles 511 may be provided in the rotor winding 52. As shown in Fig. 3, the multiple holes 523 are spaced apart from one another in the axial direction of the rotation axis Ax.

[0036] 2, each hole 523 penetrates the first portion 52a and opens to both ends 52a3, 52a4 of the first portion 52a in the radial direction of the rotation axis Ax. That is, each hole 523 penetrates the conductors 521 and the insulators 522 stacked in the first portion 52a. The end 52a3 is the end of the first portion 52a on the outer side in the radial direction of the rotation axis Ax. The end 52a4 is the end of the first portion 52a on the inner side in the radial direction.

[0037] 4 is a cross-sectional view of rotor 5 taken along line BB in FIG. 2. As shown in FIG. 4, hole 523 is inclined obliquely relative to the radial direction. For example, the end of hole 523 opening at end 52a4 is located further forward (in the +X direction) than the end of hole 523 opening at end 52a3. Note that the positions of both ends of hole 523 are not limited to this example.

[0038] The holes 523 inclined obliquely with respect to the radial direction are formed, for example, by shifting the positions of holes (parts of the holes 523) provided in the conductors 521 and insulators 522 stacked in each first portion 52a. Note that the holes 523 are not limited to this example and may be formed so as to extend obliquely with respect to the radial direction by other methods. Furthermore, the holes 523 may be open in a direction perpendicular to the rotation axis Ax without being inclined.

[0039] As shown in Fig. 2, each pole head 53 is attached to the end of the corresponding salient pole 511 on the radially outer side of the rotation axis Ax. Each pole head 53 protrudes axially and circumferentially from the side surface 511a of the salient pole 511. As a result, each pole head 53 presses the rotor winding 52 from the radially outer side. Therefore, the pole head 53 is located between the salient pole 511 and the inner circumferential portion 31a of the stator core 31 in the radial direction. Furthermore, the pole head 53 is located between the rotor winding 52 and the inner circumferential portion 31a of the stator core 31 in the radial direction.

[0040] The width of the first portion 52a in the circumferential direction is greater than the width of the portion of the pole head 53 that protrudes from the side surface 511a of the salient pole 511. Therefore, part of the first portion 52a of the rotor winding 52 protrudes from the pole head 53 in the circumferential direction.

[0041] The radially outer end face 53a of the pole head 53 is an arc-shaped curved surface extending in the circumferential direction. The radius of the end face 53a is shorter than the radius of the inner circumferential portion 31a of the stator core 31. This separates the end face 53a from the inner circumferential portion 31a, forming a gap between the end face 53a and the inner circumferential portion 31a through which airflow can pass.

[0042] The insulating layer 54 is a layer formed of, for example, a synthetic resin, etc. The insulating layer 54 has a portion extending radially between the salient pole 511 and the rotor winding 52, and a portion extending approximately circumferentially between the rotor winding 52 and the pole head 53. In other words, the insulating layer 54 has an L-shaped cross section.

[0043] The rotating electric machine 1 further includes a barrier 6. The barrier 6 is spaced apart from the pole head 53 in the circumferential direction. The barrier 6 protrudes from an end 52a3 of the first portion 52a toward the inner circumferential portion 31a of the stator core 31. The end 52a3 is the surface of the rotor 5. The barrier 6 extends, for example, at an incline from the end 52a3 toward the pole head 53. The end of the barrier 6 on the outer radial side is closer to the rotation axis Ax than the end face 53a of the pole head 53. Therefore, the barrier 6 is spaced apart from the inner circumferential portion 31a of the stator core 31. In this embodiment, the barrier 6 is plate-shaped and extends linearly from the end 52a3, but this is not limiting. For example, the barrier 6 may extend in a curved manner from the end 52a3.

[0044] The barrier 6 is provided, for example, by cutting out a part of the conductor 521 located at the radially outer end of the rotor winding 52. In other words, the barrier 6 is part of the conductor 521. Therefore, the barrier 6 extends from the edge of each hole 523. Of the two edges of each hole 523 aligned in the circumferential direction, the barrier 6 extends from the edge farther from the salient pole 511. In other words, the hole 523 is located between the salient pole 511 and the barrier 6 in the circumferential direction.

[0045] 1 is, for example, a plain bearing. The two bearings 7 are provided in the opening 21 of the housing 2. That is, on the shaft 4, the rotor core 51 is located between the two bearings 7 in the axial direction.

[0046] When the rotating electric machine 1 is operated, the rotor 5 and the internal fan 41 attached to the shaft 4 rotate in accordance with the rotation of the shaft 4. The rotation of the internal fan 41 generates an airflow in the closed space of the housing 2. Furthermore, the rotation of the rotor 5 causes an airflow to flow along the surface of the rotor 5.

[0047] The airflow flowing along the surface of the rotor 5 flows, for example, along the surfaces of the second portion 52b, the third portion 52c, and the fourth portion 52d of the rotor winding 52, thereby cooling the rotor winding 52. The airflow also flows along the end face 53a of the pole head 53 in the direction opposite to the direction of rotation (the back side).

[0048] The first portion 52a of the rotor winding 52, the holes 523 provided in the first portion 52a, and the barrier 6 are located on the rear side in the direction of rotation. After passing through the pole head 53, the airflow collides with the barrier 6.

[0049] The airflow that collides with the barrier 6 is guided by the barrier 6 toward the hole 523. The airflow passes through the hole 523 while cooling the rotor winding 52. The airflow that has passed through the hole 523 flows along the surface of the other salient pole 511 and comes into contact with the barrier 6 of the rotor winding 52 wound around that other salient pole 511. Thereafter, the airflow cools the entire rotor 5 in a similar manner.

[0050] As described above, the holes 523 are inclined obliquely. Therefore, the airflow is sent to the front side (+X direction) by passing through the holes 523. Therefore, the holes 523 can guide the cooling gas circulated by the internal fan 41 to the front side in the axial direction.

[0051] As described above, the rotating electric machine 1 of this embodiment includes the housing 2, the stator 3, the shaft 4, the rotor 5, and the barrier 6. The stator 3 is housed in the housing 2. The shaft 4 is rotatable around the rotation axis Ax surrounded by the stator 3. The rotor 5 is attached to the shaft 4 and has a salient pole 511 and a rotor winding 52. The salient pole 511 extends radially about the rotation axis Ax between the stator 3 and the shaft 4. The rotor winding 52 is wound around the salient pole 511. The barrier 6 protrudes from the surface of the rotor 5 toward the stator 3. The rotor winding 52 has a first portion 52a, a second portion 52b, a third portion 52c, and a fourth portion 52d. The second portion 52b is spaced from the first portion 52a in the circumferential direction around the rotation axis Ax. The third portion 52c connects one end 52a1 of the first portion 52a in the axial direction of the rotation axis Ax to one end 52b1 of the second portion 52b in the axial direction. The fourth portion 52d connects the other end 52a2 of the first portion 52a in the axial direction to the other end 52b2 of the second portion 52b in the axial direction. Furthermore, a hole 523 is provided in the rotor winding 52. The hole 523 penetrates the first portion 52a and opens to both ends 52a3, 52a4 of the first portion 52a in the radial direction. The salient pole 511 is located between the first portion 52a and the second portion 52b in the circumferential direction and between the third portion 52c and the fourth portion 52d in the axial direction. The hole 523 is located between the salient pole 511 and the barrier 6 in the circumferential direction.

[0052] When the rotor 5 rotates so that the first portion 52a faces the rear side in the rotation direction, the airflow flowing on the surface of the rotor 5 comes into contact with the barrier 6. Holes 523 are provided between the salient poles 511 and the barrier 6 in the circumferential direction. Therefore, the airflow that comes into contact with the barrier 6 passes through the holes 523 that penetrate the first portion 52a of the rotor winding 52. As a result, the airflow flows while cooling the rotor winding 52. Therefore, in the rotating electric machine 1, the cooling efficiency of the rotor 5 can be improved.

[0053] In this embodiment, the holes 523 are spaced apart from the salient poles 511, penetrate the first portions 52a, and open to both ends 52a3, 52a4 of the first portions 52a in the radial direction. This increases the contact area of ​​the rotor winding 52 with the airflow passing through the holes 523, compared to when grooves are provided. Therefore, the holes 523 make it easier to cool the rotor winding 52.

[0054] Furthermore, in this embodiment, the rotor winding 52 has a spiral conductor 521 and a spiral insulator 522 that are stacked in the radial direction. The barrier 6 is a part of the conductor 521. The barrier 6 is a part of the rotor winding 52 that has the stacked conductor 521. This eliminates the need for the rotating electric machine 1 to attach the barrier 6 to the rotor winding 52 by welding or the like. Therefore, the barrier 6 is less likely to be separated from the rotor winding 52 by the centrifugal force generated when the rotor 5 rotates.

[0055] Second Embodiment Fig. 5 is a cross-sectional view of a rotor 5A according to the second embodiment. As shown in Fig. 5, the rotor 5A according to the second embodiment has the same configuration as the rotor 5 according to the first embodiment, except for the configuration described below. Therefore, the second embodiment also provides the same effects as the first embodiment.

[0056] In the second embodiment, the rotor 5A has a barrier 6A that is different from the barrier 6 of the first embodiment. The barrier 6A is provided, for example, by cutting out a part of the insulator 522 located at the radially outer end of the rotor winding 52. In other words, the barrier 6A is a part of the insulator 522.

[0057] As described above, the rotor winding 52 has a spiral conductor 521 and a spiral insulator 522 that are stacked in the radial direction. The barrier 6A is part of the insulator 522. The barrier 6A is part of the rotor winding 52 that has the stacked insulator 522. This eliminates the need for the rotating electric machine 1 to attach the barrier 6A to the winding by welding or the like. Therefore, the barrier 6A is less likely to separate from the rotor winding 52 due to the centrifugal force generated when the rotor 5A rotates.

[0058] <Third embodiment> Fig. 6 is a cross-sectional view of a rotor 5B of the third embodiment. Fig. 7 is a perspective view of the rotor 5B of the third embodiment. As shown in Figs. 6 and 7, the rotor 5B of the third embodiment has the same configuration as the rotor 5 of the first embodiment, except for the configuration described below. Therefore, the third embodiment also provides effects based on the same configuration as the first embodiment.

[0059] In the third embodiment, the rotor 5B has a pole head 53B different from the pole head 53 of the first and second embodiments, and a barrier 6B different from the barriers 6, 6A of the first and second embodiments. The pole head 53B has an extension 531. Furthermore, the pole head 53B is provided with an opening 532. The opening 532 is an example of a second passage.

[0060] The extension portion 531 extends from the side surface of the pole head 53B to the end of the first portion 52a in the circumferential direction and covers the first portion 52a. In other words, the extension portion 531 is a part of the pole head 53B.

[0061] The height of the extension 531 is lower than the height of the other parts of the pole head 53B. In other words, the extension 531 is a part recessed radially inward from the end face 53a of the pole head 53B. This allows the airflow flowing over the end face 53a of the pole head 53B to be guided to the end 52a3 of the first part 52a.

[0062] The opening 532 is a hole that penetrates the extension 531 and opens to both ends of the extension 531 in the radial direction of the rotation axis Ax. The opening 532 communicates with the hole 523 of the rotor winding 52, and is located between the salient pole 511 and the barrier wall 6B in the circumferential direction.

[0063] The barrier 6B is provided by cutting out a part of the extension 531 of the pole head 53B. In other words, the barrier 6B is part of the pole head 53B. The barrier 6B extends from the edge of the opening 532. Of the two edges of the opening 532 aligned in the circumferential direction, the barrier 6B extends from the edge farther from the salient pole 511. The extension 531 is made of the same material (e.g., metal) as the pole head 53B. Therefore, the pole head 53B can increase the force that holds down the rotor winding 52 against centrifugal force compared to the first and second embodiments.

[0064] (Modification 1 of the third embodiment) In the third embodiment, the barrier 6B is provided by cutting out a part of the extension 531 of the pole head 53B, but this is not limited to this. Fig. 8 is a perspective view of a first modified example of the rotor 5B of the third embodiment. As shown in Fig. 8, the rotor 5B of the first modified example has a pole head 53C equipped with a side plate 61 instead of the pole head 53B.

[0065] The side plates 61 are triangular plates attached to the barrier 6B so as to extend from both ends of the barrier 6B in the front-rear direction (X direction) toward the extensions 531. The side plates 61 can be attached to the barrier 6B by, for example, welding, bonding, or integral molding by press working. This makes it easier for the opening 532 to take in the airflow flowing over the surface of the rotor 5B. The configuration of this modified example is also applicable to the first and second embodiments. That is, the side plates 61 may be attached to the barrier 6, 6A.

[0066] (Modification 2 of the third embodiment) In the third embodiment, the height of the extension 531, where the opening 532 is open, is lower than the height of the other parts of the pole head 53B, but this is not limited to this. Fig. 9 is a perspective view of a second modified example of the rotor 5B of the third embodiment. As shown in Fig. 9, in the second modified example, a pole head 53D is provided instead of the pole head 53C, and the extension 531 and the opening 532 are not provided. In the second modified example, the part of the pole head 53D having the curved end face 53a covers the first part 52a of the rotor winding 52.

[0067] 10 is a cross-sectional view of Modification 2 of the rotor 5B of the third embodiment. As shown in FIG. 10, the shape of the pole head 53D of Modification 2 is different from the shape of the pole head 53 of the first embodiment. Note that the pole head 53 of the first embodiment, the pole head 53 of the second embodiment, the pole head 53B of the third embodiment, and the pole head 53C of Modification 1 of the third embodiment may have the shapes described below.

[0068] The end face 53a of the pole head 53D is a curved surface in the shape of a circular arc extending in the circumferential direction. The radius of the end face 53a of the pole head 53D in Modification 2 is smaller than the radius of the inner circumferential portion 31a of the stator 3. The center of the end face 53a is spaced apart from the center (rotation axis Ax) of the stator 3. As a result, the end face 53a of the portion of the pole head 53D covering the first portion 52a of the rotor winding 52 is spaced apart from the inner circumferential portion 31a of the stator 3 more than the apex 53a1 of the end face 53a of the pole head 53D, which is the farthest from the rotation axis Ax.

[0069] In the second modification, the rotor 5B has an opening 532B in the pole head 53D. The opening 532B penetrates a part of the pole head 53D to communicate with the hole 523 and is a hole that opens to both ends of the pole head 53D in the radial direction of the rotation axis Ax. Therefore, the opening 532B opens to the end face 53a.

[0070] The opening 532B includes an inclined portion 533 and a straight portion 534. The inclined portion 533 and the straight portion 534 are part of the opening 532B and are connected to each other. The straight portion 534 is connected to the hole 523 and extends in the same direction as the hole 523. The inclined portion 533 is located between the end face 53a and the straight portion 534 and opens to the end face 53a. Of the two circumferentially aligned edges of the inclined portion 533, the edge closer to the salient pole 511 is inclined obliquely from the edge of the straight portion 534 toward the apex 53a1 of the pole head 53D. The inclined portion 533 is not present in any portion other than the X-axis portion where the opening 532B is located. Therefore, the pole head 53D can increase the force with which it can hold the rotor winding 52 against centrifugal force compared to the first modification.

[0071] The barrier 6B is provided by, for example, forming a wall separating the inclined portion 533 and the straight portion 534 in the opening 532B of the pole head 53D by casting, cutting, or cutting after casting, and then cutting the wall. In other words, the barrier 6B is a part of the pole head 53D. After being cut and raised, the barrier 6B is bent inward so that the part of the barrier 6B farthest from the rotation axis Ax does not exceed the imaginary outer diameter surface 5B1 of the rotor 5B that passes through the top portion 53a1 of the pole head 53D. Note that the inclined portion 533 may be formed by cutting the barrier 6B after cutting it.

[0072] The barrier wall 6B extends from one of two circumferentially aligned edges of the opening 532B that is farther from the salient pole 511 along the inclined portion 533. In other words, the opening 532B is located between the salient pole 511 and the barrier wall 6B in the circumferential direction.

[0073] (Modification 2-1 of the third embodiment) The method for forming the barrier 6B is not limited to the above. Fig. 11 is a cross-sectional view of Modification 2-1 of the rotor 5B of the third embodiment. As shown in Fig. 11, the barrier 6B may be cut and raised so as to extend along the hole 523, and then cut by cutting to a length that does not exceed the outer diameter surface 5B1 of the rotor 5B.

[0074] In this modification, a pole head 53E is used instead of the pole head 53D. The first portion 52a of the rotor winding 52 is covered by a portion of the pole head 53E having a curved end face 53a. This reduces the resistance of the airflow flowing over the surface of the rotor 5B when the rotor core 51 rotates. Furthermore, in the rotating electric machine 1, the average air gap distance between the curved end face 53a of the portion of the pole head 53E that covers the first portion 52a of the rotor winding 52 and the inner circumferential portion 31a of the stator 3 is shortened, thereby reducing the leakage magnetic flux of the rotor 5B.

[0075] As described above, the rotor 5B further has pole heads 53B (53C, 53D, 53E). The pole heads 53B (53C, 53D, 53E) are attached to the salient poles 511 and are positioned radially between the salient poles 511 and the stator 3, as well as between the rotor winding 52 and the stator 3. The pole heads 53B (53C, 53D, 53E) are provided with openings 532 (532B). The openings 532 (532B) communicate with the holes 523 and are positioned circumferentially between the salient poles 511 and the barrier 6B. The barrier 6B is a part of the pole heads 53B (53C, 53D, 53E). As a result, the pole head 53B (53C, 53D, 53E) has a portion (extension 531, etc.) positioned around the hole 523, and can press the rotor winding 52 from the radially outer side.

[0076] <Fourth embodiment> Fig. 12 is a cross-sectional view of a rotor 5C of the fourth embodiment. As shown in Fig. 12, the rotor 5C of the fourth embodiment has the same configuration as the rotor 5 of the first embodiment, except for the configuration described below. Therefore, the fourth embodiment also provides effects based on the same configuration as the first embodiment.

[0077] In the fourth embodiment, the rotor 5C has an insulating layer 54C different from the insulating layer 54 of the first embodiment and a barrier 6C different from the barrier 6 of the first embodiment. A part of the insulating layer 54C extends to the end of the first portion 52a in the circumferential direction and covers the first portion 52a.

[0078] An opening 541 is provided in the insulating layer 54C at a position spaced apart from the pole head 53. The opening 541 is a hole that opens to both ends of the insulating layer 54C in the radial direction of the rotation axis Ax. The opening 541 communicates with the hole 523 of the rotor winding 52, and is located between the salient pole 511 and the barrier wall 6C in the circumferential direction.

[0079] The barrier 6C is provided by cutting out a part of the insulating layer 54C. In other words, the barrier 6C is part of the insulating layer 54C. The barrier 6C extends from the edge of the opening 541. Of the two edges of the opening 541 aligned in the circumferential direction, the barrier 6C extends from the edge farther from the salient pole 511. Note that, as in the first modification of the third embodiment, the barrier 6C may have a side plate 61.

[0080] As described above, the rotor 5 has an insulating layer 54C that is located between the rotor winding 52 and the salient pole 511, and also between the rotor winding 52 and the pole head 53. The insulating layer 54C has an opening 541 that communicates with the hole 523 and is located between the salient pole 511 and the barrier 6C in the circumferential direction. The barrier 6C is a part of the insulating layer 54C. As a result, the insulating layer 54C has a portion that is located around the hole 523, and can hold the rotor winding 52 from the radially outer side.

[0081] Although the embodiments of the present invention have been described above, the above embodiments are merely examples and are not intended to limit the scope of the invention. The above embodiments can be implemented in various other forms, and various omissions, substitutions, combinations, and modifications can be made without departing from the spirit of the invention. Furthermore, the specifications of each configuration, shape, and the like (structure, type, direction, format, size, length, width, thickness, height, number, arrangement, position, material, etc.) can be modified as appropriate. [Explanation of symbols]

[0082] 1...rotating electric machine, 2...casing, 3...stator, 4...shaft, 5, 5A, 5B, 5C...rotor, 51...rotor core, 511...salient pole, 52...rotor winding (winding), 52a...first part, 52a1...one end, 52a2...other end, 52a3, 52a4...end, 52b...second part, 52b1...one end, 52b2...other end, 52c...third part, 52d...fourth part, 521...conductor, 522...insulator, 523...hole (first passage), 53, 53B, 53C, 53D, 53E...pole head, 532...opening (second passage), 6, 6A, 6B, 6C...barrier, Ax...rotating axis.

Claims

1. The housing and a stator housed in the housing; a shaft rotatable around a rotation axis surrounded by the stator; a rotor attached to the shaft, the rotor having salient poles extending in a radial direction of the rotary shaft between the stator and the shaft and windings wound around the salient poles; a barrier protruding from a surface of the rotor toward the stator; Equipped with the winding has a first portion, a second portion spaced from the first portion in a circumferential direction around the rotation axis, a third portion connecting one end of the first portion in the axial direction of the rotation axis to one end of the second portion in the axial direction, and a fourth portion connecting the other end of the first portion in the axial direction to the other end of the second portion in the axial direction, and a first passage is provided that passes through the first portion and opens at both ends of the first portion in the radial direction; the salient pole is located between the first portion and the second portion in the circumferential direction and between the third portion and the fourth portion in the axial direction, the first passage is located between the salient pole and the barrier wall in the circumferential direction, the winding includes a spiral conductor and a spiral insulator stacked in the radial direction, the barrier is part of the conductor; Rotating electric motor.

2. A housing, a stator housed in the housing; a shaft rotatable around a rotation axis surrounded by the stator; a rotor attached to the shaft, the rotor having salient poles extending in a radial direction of the rotary shaft between the stator and the shaft and windings wound around the salient poles; a barrier protruding from a surface of the rotor toward the stator; Equipped with the winding has a first portion, a second portion spaced from the first portion in a circumferential direction around the rotation axis, a third portion connecting one end of the first portion in the axial direction of the rotation axis to one end of the second portion in the axial direction, and a fourth portion connecting the other end of the first portion in the axial direction to the other end of the second portion in the axial direction, and a first passage is provided that passes through the first portion and opens at both ends of the first portion in the radial direction; the salient pole is located between the first portion and the second portion in the circumferential direction and between the third portion and the fourth portion in the axial direction, the first passage is located between the salient pole and the barrier wall in the circumferential direction, the winding includes a spiral conductor and a spiral insulator stacked in the radial direction, the barrier is part of the insulator; Rotating electric motor.

3. A housing, a stator housed in the housing; a shaft rotatable around a rotation axis surrounded by the stator; a rotor attached to the shaft, the rotor having salient poles extending in a radial direction of the rotary shaft between the stator and the shaft and windings wound around the salient poles; a barrier protruding from a surface of the rotor toward the stator; Equipped with the winding has a first portion, a second portion spaced from the first portion in a circumferential direction around the rotation axis, a third portion connecting one end of the first portion in the axial direction of the rotation axis to one end of the second portion in the axial direction, and a fourth portion connecting the other end of the first portion in the axial direction to the other end of the second portion in the axial direction, and a first passage is provided that passes through the first portion and opens at both ends of the first portion in the radial direction; the salient pole is located between the first portion and the second portion in the circumferential direction and between the third portion and the fourth portion in the axial direction, the first passage is located between the salient pole and the barrier wall in the circumferential direction, the rotor further includes a pole head attached to the salient pole, positioned between the salient pole and the stator in the radial direction, and positioned between the winding and the stator in the radial direction; a second passage communicating with the first passage and positioned between the salient pole and the barrier wall in the circumferential direction is provided in the pole head; The barrier is part of the pole head. Rotating electric motor.

4. the first passage is a hole that is spaced from the salient pole, penetrates the first portion, and opens to both ends of the first portion in the radial direction.

4. The rotating electric machine according to claim 1.

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