Rotary electric machine

Abstract

To provide a rotary electric machine capable of suppressing a length of a rotating shaft in an axial direction to realize a slip ring capable of handling large currents.SOLUTION: A rotary electric machine 10 comprises a stator 12, a rotor 13 having a rotor core 24 and a rotor coil 25, and rotatable for the stator 12, a rotating shaft 14 inserted through the center of the rotor core 24 and integrated with the rotor core 24, a motor housing 11 accommodating the stator 12 and the rotor 13 and supporting the rotating shaft 14, a slip ring 30 electrically connected to the rotor coil 25 and rotating integrally with the rotor 13 and the rotating shaft 14, and a power supply member 33 provided on the motor housing 11 and brought into slide contact with the slip ring 30. The slip ring 30 is provided on an end surface of the rotor 13, and the power supply member 33 is brought into slide contact with an end surface 32 of the slip ring 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rotating electric machine having a slip ring and a power supply member in sliding contact with the slip ring. [Background technology]

[0002] As a conventional technique related to a rotating electric machine, for example, an axial gap type motor disclosed in Patent Document 1 is known. The axial gap type motor disclosed in Patent Document 1 includes a rotor that can rotate around a rotation axis, and a stator that is arranged facing the rotor from one side in the rotation axis direction. The rotor includes an electromagnet having a coil to which a lead wire is connected, and is connected to an external current control device via a slip ring. The slip ring includes a ring portion fixed to the rotor and a brush portion fixed to the stator. The brush portion and the current control device are connected via a connection wire. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-93929 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the axial gap motor disclosed in Patent Document 1, the ring portion of the slip ring is provided on the shaft portion of the rotor with a reduced diameter, so there is a problem that increasing the contact area of ​​the ring portion results in an increase in the axial length of the shaft portion.In addition, since the outer diameter of the ring portion needs to be smaller than the inner diameter of the stator, the ring portion has a small diameter, which limits the contact area of ​​the ring portion with the brush portion, resulting in a problem that the current supplied to the coil is limited to a small current.

[0005] The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide a rotating electric machine that can reduce the axial length of the rotating shaft and makes it easier to realize a slip ring that can handle larger currents. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention provides a rotating electric machine having a stator, a rotor having a rotor core and a rotor coil and rotatable relative to the stator, a rotating shaft inserted through the center of the rotor core and integrated with the rotor core, a motor housing that accommodates the stator and the rotor and supports the rotating shaft, a slip ring electrically connected to the rotor coil and rotating integrally with the rotor and the rotating shaft, and a power supply member provided on the motor housing and capable of sliding contact with the slip ring, wherein the slip ring is provided on an end face of the rotor, and the power supply member is in sliding contact with an end face of the slip ring.

[0007] In the present invention, the slip ring is provided on the end face of the rotor, and the power supply member is in sliding contact with the end face of the slip ring. Current can be passed through the rotor coil via the power supply member and the slip ring. By providing the slip ring on the end face of the rotor, the rotor and the slip ring are integrated. As a result, the axial length of the rotating shaft can be shortened compared to when a slip ring is provided on the rotating shaft, and the slip ring can be made larger in diameter, making it easier to realize a slip ring that can handle large currents.

[0008] In addition, in the above-mentioned rotating electric machine, an air gap may be formed between an end face of the rotor and the stator, and the slip ring may be provided on the end face opposite to the end face of the rotor where the air gap is formed, or at a position outside the air gap on the end face of the rotor where the air gap is formed. In this case, an air gap is formed between the end face of the rotor and the stator, so the rotating electric machine is an axial gap type rotating electric machine. Even if the rotating electric machine is an axial gap type, it is possible to shorten the axial length of the rotating shaft and increase the diameter of the slip ring.

[0009] In the above rotating electric machine, the outer circumferential diameter of the slip ring may be the same as the outer circumferential diameter of the rotor. In this case, since the outer diameter of the slip ring is the same as that of the rotor, the outer diameter of the slip ring is the maximum diameter at the end face of the rotor, making it easier to increase the area of ​​the end face of the slip ring. Increasing the area of ​​the end face of the slip ring makes it possible to handle a large current through the slip ring.

[0010] The present invention also provides a rotating electric machine having a stator, a rotor having a rotor core and a rotor coil and rotatable relative to the stator, a rotating shaft inserted through the center of the rotor core and integrated with the rotor core, a motor housing that accommodates the stator and the rotor and supports the rotating shaft, a slip ring electrically connected to the rotor coil and rotating integrally with the rotor and the rotating shaft, and a power supply member provided in the motor housing and capable of sliding contact with the slip ring, wherein the slip ring is provided on the outer periphery of the rotor so as to be positioned radially outward from the rotor coil.

[0011] In the present invention, the slip ring is provided on the outer periphery of the rotor so as to be positioned radially outward from the rotor coil. This allows the axial length of the rotating shaft to be shortened compared to when a slip ring is provided on the rotating shaft, and the diameter of the slip ring can be made larger, thereby realizing a slip ring that can handle large currents.

[0012] In the above rotating electric machine, an air gap may be formed between an end face of the rotor core and the stator, and the slip ring may be provided on an outer periphery of the rotor core. In this case, an air gap is formed between the end face of the rotor and the stator, so the rotating electric machine is an axial gap type rotating electric machine. Even if the rotating electric machine is an axial gap type rotating electric machine, by providing a slip ring on the outer periphery of the rotor core, it is possible to shorten the axial length of the rotating shaft and increase the diameter of the slip ring.

[0013] In addition, in the above rotating electric machine, an air gap may be formed between the outer periphery of the rotor core and the stator, the rotor may have a connecting body provided at an end of the rotor core, and the slip ring may be provided on the outer periphery of the connecting body. In this case, an air gap is formed between the outer periphery of the rotor core and the stator, so the rotating electric machine is a radial gap type rotating electric machine. Even if the rotating electric machine is a radial gap type rotating electric machine, a slip ring can be provided on the outer periphery of the rotor because the slip ring is provided on the outer periphery of the connecting body provided at the end of the rotor core. As a result, it is possible to accommodate a large current by shortening the axial length of the rotating shaft and increasing the diameter of the slip ring. Effect of the Invention

[0014] According to the present invention, it is possible to provide a rotating electric machine that can reduce the axial length of the rotating shaft and realize a slip ring that can handle large currents. [Brief description of the drawings]

[0015] [Figure 1] 1 is a vertical sectional view that illustrates a rotating electric machine according to a first embodiment. [Diagram 2] FIG. 2 is a view taken along line AA in FIG. [Diagram 3] FIG. 1(a) is a vertical cross-sectional view that shows a schematic view of an electric motor according to a first modified example, and FIG. 1(b) is a vertical cross-sectional view that shows a schematic view of an electric motor according to a second modified example. [Figure 4] FIG. 6 is a vertical sectional view showing a schematic view of an electric motor according to a second embodiment. [Diagram 5]FIG. 11 is a vertical sectional view showing a schematic view of an electric motor according to a third embodiment. [Figure 6] FIG. 11 is a vertical sectional view that illustrates a schematic view of an electric motor according to a fourth embodiment. [Figure 7] FIG. 11 is a vertical sectional view showing a schematic view of an electric motor according to a third modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] (First embodiment) Hereinafter, a rotating electric machine according to a first embodiment will be described with reference to the drawings. The rotating electric machine of this embodiment is a field winding type electric motor having a rotor coil. The rotating electric machine of this embodiment is also an axial gap type motor in which an air gap between a stator and a rotor is formed in the axial direction.

[0017] As shown in Fig. 1, an axial gap motor (hereinafter simply referred to as "motor") 10 of this embodiment has a motor housing 11, a stator 12, a rotor 13, and a rotating shaft 14. The motor housing 11 has a cylindrical main body 15, an end plate 16 that closes one end of the main body 15, and an end plate 17 that closes the other end. A shaft hole 18 is formed in the center of one end plate 16, and a shaft hole 19 is formed in the center of the other end plate 17. The motor housing 11 accommodates the stator 12 and the rotor 13.

[0018] The stator 12 is attached to the main body 15 of the motor housing 11. The stator 12 has a stator core 20 and a plurality of stator coils 21 arranged in the circumferential direction on the stator core 20. An axial hole 22 is formed in the center of the stator core 20. A plurality of teeth (not shown) protruding toward the rotor 13 are arranged in the circumferential direction on the stator core 20, and the stator coils 21 are wound around the teeth. In FIG. 1, a part of the stator coil 21 is exposed. One end face 20A of the stator core 20 faces the rotor 13, and the other end face 20B of the stator core 20 faces the end plate 17.

[0019] The rotor 13 has a rotor core 24 and a plurality of rotor coils 25. The rotor core 24 is disk-shaped and has a through hole 26 formed in the center. The rotating shaft 14 is inserted into the through hole 26 and fixed to the rotor core 24. Therefore, the rotating shaft 14 is integrated with the rotor core 24. One end of the rotating shaft 14 is inserted into the shaft hole 18 and is rotatably supported by the end plate 16 via a bearing 27. The other end of the rotating shaft 14 is inserted into the through hole 26 and the shaft hole 19 and is rotatably supported by the end plate 17 via a bearing 28. Therefore, the motor housing 11 supports the rotating shaft 14, and the rotor 13 is rotatable relative to the stator 12. Incidentally, the other end of the rotating shaft 14 corresponds to the output side.

[0020] The outer peripheral portion 24C of the rotor core 24 faces the main body portion 15 of the motor housing 11. One end face 24A of the rotor core 24 faces the end plate 16, and the other end face 24B of the rotor core 24 faces the stator 12. The end faces 24A and 24B of the rotor core 24 are surfaces that are substantially perpendicular to the axis P of the rotating shaft 14, and the outer peripheral surface that forms the outer peripheral portion 24C is substantially parallel to the axis P of the rotating shaft 14. A plurality of rotor coils 25 are disposed in the circumferential direction of the rotor core 24. The rotor coils 25 are excited by energization. An air gap G1 is set between the other end face 24B of the rotor core 24 and one end face 20A of the stator core 20. The stator coil 21 and the rotor coil 25 are excited by energization, so that the rotor 13 rotates about the axis P.

[0021] An annular slip ring 30 is provided on one end surface 24A of the rotor core 24. The slip ring 30 is electrically connected to the rotor coil 25 by a lead wire 31, and rotates integrally with the rotor 13 and the rotating shaft 14. The slip ring 30 of this embodiment has a sliding surface 32 that slides against a power supply member 33 described below. One end surface of the slip ring 30 is the sliding surface 32, and the other end surface of the slip ring 30 is a joint surface with the rotor core 24. As shown in FIG. 2, the outer diameter of the slip ring 30 is the same as the outer diameter of the rotor core 24, and the inner diameter of the slip ring 30 is set to be larger than the outer diameter of the rotor coil 25. By making the outer diameter of the slip ring 30 the same as the outer diameter of the rotor core 24, it is possible to ensure a sufficient area of ​​the sliding surface 32.

[0022] Next, the power supply member 33 will be described. The power supply member 33 is connected to an external power source 35 by a wiring 34. The power supply member 33 has a brush portion 36 that contacts the sliding surface 32 of the slip ring 30, and a brush support portion 37 that supports the brush portion 36. The brush portion 36 has a radial width that is slightly smaller than the radial width of the slip ring 30. Therefore, the brush portion 36 can slide against the sliding surface 32 when the rotor 13 rotates. There is no particular limit to the circumferential length of the brush portion 36, but it may be set within a range that does not interfere with the flow of electricity to the slip ring 30 and can suppress mechanical loss when the rotor 13 rotates.

[0023] The brush support portion 37 in this embodiment is a shaft member extending from one end plate 16 toward the slip ring 30. The axial length of the brush support portion 37 is set so that the brush portion 36 is always in contact with the sliding surface 32 of the slip ring 30. A part of the wiring 34 is inserted into the brush support portion 37. Power from an external power source is supplied to the slip ring 30 through the wiring 34 and the brush portion 36. The larger the current flowing through the slip ring 30, the greater the driving torque of the motor 10 can be.

[0024] Next, the operation of the motor 10 according to this embodiment will be described. When current is applied to the stator coil 21 and current is supplied from the power supply member 33 to the rotor coil 25 through the slip ring 30 and the lead wire 31, the rotor 13 rotates due to the relationship between the magnetic flux generated in the stator 12 and the magnetic flux generated in the rotor 13.

[0025] The sliding surface 32 of the slip ring 30 is determined by the outer diameter and inner diameter of the slip ring 30, but the outer diameter of the slip ring 30 is set to be the same as the outer diameter of the rotor core 24, and the inner diameter of the slip ring 30 is set to be larger than the outer diameter of the rotor coil 25. Therefore, compared to a case in which a slip ring is provided on the rotating shaft 14 and the outer surface of this slip ring is used as the sliding surface, the area of ​​the sliding surface 32 is increased without increasing the axial length of the rotating shaft 14. As the area of ​​the sliding surface 32 increases, it becomes possible to increase the current supplied to the rotor coil 25.

[0026] The motor 10 of the present embodiment provides the following advantages. (1) The slip ring 30 is provided on the end face of the rotor 13, and the power supply member 33 is in sliding contact with the sliding surface 32, which serves as the end face of the slip ring 30. A current can be passed through the rotor coil 25 via the power supply member 33 and the slip ring 30. By providing the slip ring 30 on the end face of the rotor 13, the rotor core 24 and the slip ring 30 are integrated. As a result, the axial length of the rotating shaft 14 can be shortened compared to the case where the slip ring 30 is provided on the rotating shaft 14, and the diameter of the slip ring 30 can be increased, making it easier to realize a slip ring 30 that can handle a large current.

[0027] (2) Motor 10 is an axial gap type motor because air gap G1 is formed between end face 24B of rotor core 24 and end face 20B of stator core 20. Even if motor 10 is an axial gap type motor, by providing slip ring 30 on end face 24A of rotor core 24 on the side where air gap G1 is not formed, it is possible to shorten the axial length of rotating shaft 14 and increase the diameter of slip ring 30.

[0028] (3) Because the outer diameter of the slip ring 30 is the same as the outer diameter of the rotor 13, the outer diameter of the slip ring 30 is the maximum diameter at the end face of the rotor 13, making it easy to increase the area of ​​the sliding surface 32, which is the end face of the slip ring 30. Increasing the area of ​​the sliding surface 32 of the slip ring 30 makes it possible for the slip ring 30 to accommodate larger currents.

[0029] (4) Since the slip ring 30 and the power supply member 33 are located between the rotor 13 and the end plate 16 of the motor housing 11, the outer diameter of the rotor 13 can be set close to the outer diameter of the stator 12, thereby improving the torque of the motor 10.

[0030] (Variations 1 and 2) Next, a modification of the first embodiment will be described. In a motor 101 of modification 1 shown in Fig. 3(a), a rotor core 241 has a core body 242 and a boss 243 formed integrally with the core body 242. An annular slip ring 301 is provided on an end face of the boss 243. As in a motor 102 of modification 2 shown in Fig. 3(b), a slip ring 302 may be provided on an end face of the core body 242.

[0031] Second Embodiment Next, an electric motor according to a second embodiment will be described. The electric motor of this embodiment differs from the first embodiment in that a slip ring is provided on the end face of the rotor core on the air gap side. The same configuration as the first embodiment will be described with reference to the first embodiment, and common reference numerals will be used.

[0032] In an electric motor 40 shown in Fig. 4, the shaft hole 22 of the stator core 20 is set larger than that of the first embodiment. The rotor coil 25 of the rotor core 24 is arranged in accordance with the position of the stator core 20. In this embodiment, a slip ring 41 is provided on an end face 24B of the rotor core 24 where the air gap G1 is formed. The slip ring 41 is provided at a position away from the air gap G1. One end face of the slip ring 41 is a joint surface with the rotor core 24, and the other end face is a sliding contact surface 42 with which a power supply member 43 comes into contact.

[0033] The power supply member 43 is connected to the external power source 35 by the wiring 34. The power supply member 43 has a brush portion 44 that contacts the sliding surface 42 of the slip ring 41 and a brush support portion 45 that supports the brush portion 44. The brush portion 44 has a radial width that is slightly smaller than the radial width of the slip ring 41. Therefore, the brush portion 44 can slide against the sliding surface 42 when the rotor 13 rotates. There is no particular limit to the circumferential length of the brush portion 44, but it may be set within a range that does not interfere with the flow of electricity to the slip ring 41 and can suppress mechanical loss when the rotor 13 rotates. The brush support portion 45 is provided on the end plate 17 and extends from the end plate 17 through the shaft hole 22 toward the rotor core 24.

[0034] According to the electric motor 40 of this embodiment, the slip ring 41 can be provided at a position away from the air gap G1 on the end face 24B where the air gap G1 is formed. Since the slip ring 41 is provided on the end face 24B of the rotor coil 25, the axial length of the rotating shaft 14 can be shortened compared to the case where a slip ring is provided on the rotating shaft 14, and the slip ring 41 can have a large diameter, realizing a slip ring 41 that can handle a large current. Furthermore, compared to the first embodiment, the axial length of the rotating shaft 14 can be shortened.

[0035] (Third embodiment) Next, an electric motor according to a third embodiment will be described. The electric motor of this embodiment differs from the first embodiment in that slip rings are provided on the outer periphery of the rotor core. The same configurations as those of the first embodiment will be referred to in the description of the first embodiment and will be designated by the same reference numerals.

[0036] 5, an annular slip ring 51 is provided on the outer circumferential portion 24C of the rotor core 24. The inner circumferential surface of the slip ring 51 is fixed to the outer circumferential portion 24C of the rotor core 24, and the outer circumferential surface of the slip ring 51 is a sliding surface 52 with which a power supply member 53 comes into contact, and faces the main body 15 of the motor housing 11. The slip ring 51 is located radially outward of the rotor coil 25.

[0037] The power supply member 53 is connected to the external power source 35 by the wiring 34. The power supply member 53 has a brush portion 54 that contacts the sliding surface 52 of the slip ring 51, and a brush support portion 55 that supports the brush portion 54. The brush portion 54 has an axial width that is slightly smaller than the axial width of the slip ring 51. Therefore, the brush portion 54 can slide against the sliding surface 52 when the rotor 13 rotates. There is no particular limit to the circumferential length of the brush portion 54, but it may be set within a range that does not interfere with the flow of electricity to the slip ring 51 and can suppress mechanical loss when the rotor 13 rotates.

[0038] According to the electric motor 50 of this embodiment, the slip ring 51 is provided on the outer periphery 24C of the rotor core 24 so as to be located radially outward of the rotor coil 25. This makes it possible to shorten the axial length of the rotating shaft 14 compared to a case in which a slip ring is provided on the rotating shaft 14, and also makes it possible to increase the diameter of the slip ring 51, thereby realizing a slip ring 51 that can handle large currents. Furthermore, compared to the first embodiment, it is possible to shorten the axial length of the rotating shaft 14. Furthermore, an effect equivalent to effect (2) of the first embodiment is achieved.

[0039] (Fourth embodiment) Next, an electric motor according to a fourth embodiment will be described. The electric motor of this embodiment is different from the first embodiment in that it is a radial gap type motor. In this embodiment, the same configuration as in the first embodiment will be described with reference to the first embodiment, and common reference numerals will be used.

[0040] 6, the electric motor 60 has a motor housing 11, a stator 61, a rotor 62, and a rotating shaft 14. The motor housing 11 accommodates the stator 61 and the rotor 62. The stator 61 is attached to a main body portion 15 of the motor housing 11.

[0041] The stator 61 has a stator core 63 and a plurality of stator coils 64 arranged in the circumferential direction on the stator core 63. A through hole 65 into which the rotor 62 is inserted is formed in the center of the stator core 63. A plurality of teeth (not shown) protruding toward the rotor 62 are arranged in the circumferential direction on the stator core 63, and a stator coil 364 is wound around the teeth. In FIG. 5, a portion of the stator coil 64 is exposed as a coil end.

[0042] The rotor 62 has a rotor core 66, a plurality of rotor coils 67, and a connector 68 provided at an end of the rotor core 66. The rotor core 24 is cylindrical and has an axial hole 69 formed in the center. The rotating shaft 14 is inserted into the axial hole 69 and fixed to the rotor core 66. Therefore, the rotating shaft 14 is integrated with the rotor core 66. One end of the rotating shaft 14 is inserted into the axial hole 18 and is rotatably supported by the end plate 16 via the bearing 27. The other end of the rotating shaft 14 is inserted into the axial hole 19 and is rotatably supported by the end plate 17 via the bearing 28. Therefore, the motor housing 11 supports the rotating shaft 14, and the rotor 62 is rotatable relative to the stator 61. The other end of the rotating shaft 14 is the output side shaft portion.

[0043] An air gap G2 is set between the outer peripheral surface of the rotor core 66 and the inner peripheral surface of the stator core 63. A plurality of rotor coils 67 are arranged in the circumferential direction of the rotor core 66. The rotor coils 67 are excited by energization. A connector 68 is connected to one end face 66A of the rotor core 66. The other end face 66B faces the end plate 17. The connector 68 has a shaft hole 70 through which the rotating shaft 14 is inserted at the center. The connector 68 has a same diameter portion 71 having the same diameter as the rotor core 66 and a large diameter portion 72 having an outer diameter larger than the outer diameter of the rotor core 66. The outer diameter of the large diameter portion 72 is larger than the outer diameter of the rotor coil 67. The outer peripheral surface forming the outer peripheral portion of the large diameter portion 72 is approximately parallel to the axis P of the rotating shaft 14. An annular slip ring 73 is provided on the outer peripheral portion of the large diameter portion 72.

[0044] The slip ring 73 is electrically connected to the rotor coil 67 by a lead wire 74 passing through the rotor core 66 and the connector 68, and rotates integrally with the rotor 62 and the rotating shaft 14. The slip ring 73 of this embodiment has a sliding surface 75 that comes into sliding contact with the power supply member 76. The outer peripheral surface of the slip ring 73 is the sliding surface 75, and the inner peripheral surface of the slip ring 30 is the joint surface with the large diameter portion 72. The slip ring 73 is located radially outward of the rotor coil 67. By positioning the slip ring 73 radially outward of the rotor coil 67, it is possible to increase the diameter of the slip ring 73 and ensure a sufficient area for the sliding surface 75.

[0045] The power supply member 76 is connected to the external power source 35 by the wiring 34. The power supply member 76 has a brush portion 77 that abuts against the sliding surface 32 of the slip ring 30, and a brush support portion 78 that supports the brush portion 77. The brush portion 77 has an axial width that is slightly smaller than the axial width of the slip ring 73. Therefore, the brush portion 77 can slide against the sliding surface 75 when the rotor 13 rotates. There is no particular limit to the circumferential length of the brush portion 77, but it may be set within a range that does not interfere with the flow of electricity to the slip ring 73 and can suppress mechanical loss when the rotor 13 rotates.

[0046] The brush support portion 78 is an axial member extending from the main body portion 15 toward the radial center side of the slip ring 73. The axial length of the brush support portion 78 is set so that the brush portion 77 always abuts against the sliding surface 75 of the slip ring 73. A part of the wiring 34 is inserted into the brush support portion 78.

[0047] In the electric motor 60 according to this embodiment, the slip ring 73 is provided on the outer periphery of the large diameter portion 72 of the connecting body 68 connected to the rotor core 66 so as to be located radially outward of the rotor coil 67. This allows the slip ring 73 to have a large diameter, which contributes to an increase in the area of ​​the sliding contact surface 75 due to the large diameter of the slip ring 73, and makes it easier to realize a slip ring 73 that can handle a large current.

[0048] Furthermore, since an air gap G2 is formed between the outer peripheral surface of the rotor core 66 and the inner peripheral surface of the stator core 63, the electric motor 60 is a radial gap type motor. Even if the electric motor 60 is a radial gap type motor, since the slip ring 73 is provided on the outer periphery of the connecting body 68, the slip ring 73 can be provided on the outer periphery of the rotor 62. As a result, the sliding surface 75 can be enlarged by increasing the diameter of the slip ring 73, and the slip ring 73 can handle a large current.

[0049] (Variation 3) A modification of the fourth embodiment will be described. In an electric motor 601 of modification 3 shown in FIG. 7, a rotor 621 has a rotor core 66 and a connecting body 681. The connecting body 681 is a cylindrical body set to the same outer diameter as the rotor core 66. An annular slip ring 731 is provided on the outer periphery of the connecting body 681. The slip ring 731 is located radially outward of the rotor coil 67 on the outer periphery of the connecting body 681. A power supply member 76 abuts against a sliding surface 751 of the slip ring 731.

[0050] In this modification, a sufficient distance is ensured between the outer diameter of the rotor coil 67 and the outer diameter of the rotor core 66. Therefore, it is not necessary to change the diameter of the connecting body 681 depending on the location, and the slip ring 731 can be positioned radially outward of the rotor coil 67 on the end face of the connecting body 681.

[0051] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the spirit of the invention. For example, the following modifications may be made.

[0052] In the above embodiment (including the modified example), a single slip ring is provided on the end face of the rotor, but this is not limited to the above. For example, multiple slip rings may be provided concentrically on the end face of the rotor. In this case, by providing multiple slip rings concentrically on the end face of the rotor, it is possible to further increase the area of ​​the sliding surface. In the above first embodiment (including the modified example) to third embodiment, the case where there is a single stator facing the rotor has been described, but the present invention is not limited to this. For example, a pair of stators may be arranged to sandwich the rotor in the axial direction of the rotating shaft. When using the slip ring of the first and second embodiments, the slip ring may be provided at a position on the end face of the rotor that is offset from the pair of stators. In the third embodiment, the slip ring may be provided on the outer periphery of the rotor. In the above first embodiment, an example has been described in which the outer diameter of the slip ring is the same as the outer diameter of the rotor, but the outer diameter of the slip ring does not have to be the same as the outer diameter of the rotor. For example, the outer diameter of the slip ring may be smaller than the outer diameter of the rotor. In addition, the radial width of the slip ring provided on the end face of the rotor may be freely set, but in order to accommodate large currents, it is preferable to set the area of ​​the sliding contact surface of the slip ring to be large. In the above-mentioned first embodiment (including the modified example), third embodiment, and modified example 3, the brush support portion of the power supply member extends in the axial direction from the end plate of the motor housing toward the sliding surface, but is not limited to this. For example, the brush support portion may extend from the main body portion of the motor housing toward the center in the radial direction. In the fourth embodiment (including the modified example), the brush support of the power supply member extends from the main body of the motor housing toward the sliding surface toward the center in the radial direction, but is not limited to this. For example, the brush support may extend from an end plate of the motor housing toward the sliding surface along the axial direction. [Explanation of symbols]

[0053] 10, 40, 50, 60, 101, 102, 501 Electric motor (rotating electric machine) 11 Motor housing 12, 51, 61 Stator 13, 52, 62, 521 Rotor 14 Rotational Axis 20, 53, 63 Stator core 21, 54, 64 Stator coil 24, 56, 66, 241 rotor core 24A, 66B end face 25, 57, 67 rotor coil 30, 41, 51, 73, 301, 302 slip rings 32, 42, 52, 75, 651 Sliding surface 33, 43, 53, 76 Power supply members 36, 44, 54, 77 Brush section 37, 45, 55, 78 Brush support 242 Core body 243 Boss 68, 681 Concatenation G1, G2 Air Gap P axis center

Claims

1. A stator; a rotor having a rotor core and a rotor coil and rotatable relative to the stator; A rotating shaft that is inserted through the center of the rotor core and integrated with the rotor core; a motor housing that accommodates the stator and the rotor and supports the rotating shaft; a slip ring electrically connected to the rotor coil and rotating integrally with the rotor and the rotating shaft; a power supply member provided in the motor housing and capable of slidingly contacting the slip ring, The slip ring is provided on an end surface of the rotor, The rotating electric machine according to claim 1, wherein the power supply member is in sliding contact with an end face of the slip ring.

2. An air gap is formed between the end face of the rotor and the stator, 2. The rotating electric machine according to claim 1, wherein the slip ring is provided on an end face of the rotor opposite to the end face on which the air gap is formed, or at a position away from the air gap on the end face of the rotor on which the air gap is formed.

3. 3. The rotating electric machine according to claim 1, wherein an outer diameter of the slip ring is the same as an outer diameter of the rotor.

4. A stator; a rotor having a rotor core and a rotor coil and rotatable relative to the stator; A rotating shaft that is inserted through the center of the rotor core and integrated with the rotor core; a motor housing that accommodates the stator and the rotor and supports the rotating shaft; a slip ring electrically connected to the rotor coil and rotating integrally with the rotor and the rotating shaft; a power supply member provided in the motor housing and capable of slidingly contacting the slip ring, A rotating electric machine, characterized in that the slip ring is provided on an outer periphery of the rotor so as to be positioned radially outward from the rotor coil.

5. An air gap is formed between the end face of the rotor core and the stator, 5. The rotating electric machine according to claim 4, wherein the slip ring is provided on an outer periphery of the rotor core.

6. An air gap is formed between an outer periphery of the rotor core and the stator, The rotor includes a connector provided at an end of the rotor core, 5. The rotating electric machine according to claim 4, wherein the slip ring is provided on an outer periphery of the connecting body.

Images