Motor

Abstract

To provide a motor capable of achieving miniaturization.SOLUTION: The motor comprises a stator arranged radially outside a rotor. The stator includes a stator core in which a plurality of slots are arranged in a circumferential direction and a plurality of conductor connection bodies 60A that are constituted by connecting a plurality of conductors 50 in series and inserted into the plurality of slots. The conductor connection body includes: a first portion 61 that is corrugated from a first end unit 61a to a second end unit 61b toward one side in a circumferential direction; a second portion 62 that is corrugated from a third end unit 62a to a fourth end unit 62 toward one side in the circumferential direction; and a folding portion 67 connecting the first portion and the second portion. The first end unit of the first portion and a third end unit of the second portion, and the second end unit of the first portion and the fourth end unit of the second portion project in a shaft direction from respective different slots in a circumferential direction. The plurality of conductors include folding conductors 54, 55 that join the second end unit of the first portion and the fourth end unit of the second portion to constitute a folding portion.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a motor.

Background Art

[0002] In motors for electric vehicles, distributed winding is adopted for the purpose of reducing vibration and noise. Patent Document 1 discloses a wave-wound stator using a plurality of segment coils for the purpose of improving the efficiency of the motor.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When performing winding with a conventional structure, it is not possible to secure a long routing path for the conductor. On the other hand, by providing a folded-back portion in the routing path of the conductor to be wound and winding the conductor in the reverse direction with the folded-back portion interposed therebetween, the routing path of the conductor can be lengthened. However, the segment coil is non-circular and has significantly inferior flexibility compared to a conductor using a general round wire. That is, since the shape of the folded-back portion is significantly different from that of the segment coils other than the folded-back portion, the segment coil of the folded-back portion has a large axial dimension in order to avoid other segment coils, resulting in a problem of increasing the axial dimension of the stator.

[0005] In view of the above circumstances, one object of the present invention is to provide a motor capable of achieving miniaturization.

Means for Solving the Problems

[0006] One aspect of the motor of the present invention includes a rotor rotatable about a central axis and a stator disposed radially outside the rotor. The stator includes a stator core provided with a plurality of slots arranged in the circumferential direction, and a plurality of conductor connectors configured by connecting a plurality of conductors in series and inserted into the plurality of slots. The conductor connector has a first portion wound in a circumferentially one-sided direction from a first end to a second end, a second portion wound in a circumferentially one-sided direction from a third end to a fourth end, and a folded-back portion connecting the first portion and the second portion. The first end of the first portion and the third end of the second portion, and the second end of the first portion and the fourth end of the second portion respectively protrude axially from different slots in the circumferential direction. The plurality of conductors include a folding conductor that connects the second end of the first portion and the fourth end of the second portion and constitutes the folded-back portion.

Advantages of the Invention

[0007] According to one aspect of the present invention, it is possible to provide a motor capable of achieving miniaturization.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

DETAILED DESCRIPTION OF THE INVENTION

[0009] The Z-axis direction appropriately shown in each figure is the vertical direction with the positive side being the "upper side" and the negative side being the "lower side". The central axis J appropriately shown in each figure is parallel to the Z-axis direction and is a virtual line extending in the vertical direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the vertical direction, may be simply referred to as the "axial direction", the upper side may be referred to as the "one side in the axial direction", and the lower side may be referred to as the "other side in the axial direction". Further, the radial direction centered on the central axis J may be simply referred to as the "radial direction". Furthermore, the circumferential direction centered on the central axis J may be simply referred to as the "circumferential direction", the counterclockwise direction as viewed from the upper side may be referred to as the "one side in the circumferential direction θ1", and the clockwise direction as viewed from the upper side may be referred to as the "other side in the circumferential direction θ2".

[0010] Note that the vertical direction, the upper side, and the lower side are merely names for explaining the positional relationship of each part, etc., and the actual positional relationship, etc. may be a positional relationship, etc. other than the positional relationship, etc. indicated by these names. Furthermore, the directions described as the one side in the axial direction and the other side in the axial direction can reproduce the effects of the embodiment even when they are interchanged with each other. Similarly, the directions described as the one side in the circumferential direction θ1 and the other side in the circumferential direction θ2 can reproduce the effects of the embodiment even when they are interchanged with each other.

[0011] <Motor> FIG. 1 is a schematic cross-sectional view of the motor 1 according to the present embodiment. The motor 1 of this embodiment is an inner rotor type motor. Also, the motor 1 of this embodiment is a three-phase AC motor. The center of the motor 1 is the central axis J. The motor 1 includes a rotor 3, a stator 2, a bearing holder 4, and a housing 1a that houses these components.

[0012] <Rotor> The rotor 3 is rotatable about the central axis J. The rotor 3 is disposed radially inside the annular stator 2. That is, the rotor 3 faces the stator 2 in the radial direction. The rotor 3 has a shaft 3a, a rotor magnet 3b, and a rotor core 3c.

[0013] The shaft 3a extends axially along the central axis J. The shaft 3a is, for example, cylindrical and extends axially about the central axis J. The shaft 3a is rotatably supported about the central axis J by two bearings 3p.

[0014] Figure 2 is a cross-sectional view of the motor 1 taken along line II-II of Figure 1. The rotor core 3c is formed by laminating electromagnetic steel sheets. The rotor core 3c is cylindrical and extends axially. The inner peripheral surface of the rotor core 3c is fixed to the outer peripheral surface of the shaft 3a. The rotor core 3c is provided with holding holes 3h into which the rotor magnets 3b are inserted and fixed.

[0015] The rotor magnet 3b faces the stator 2 in the radial direction. The rotor magnet 3b is held in a state of being embedded in the rotor core 3c. The rotor magnet 3b of this embodiment has 8 poles (8 poles). The number of poles of the rotor 3 is not limited to this embodiment. Also, the rotor magnet 3b may be a magnet of another form such as an annular ring magnet.

[0016] <Stator> As shown in Fig. 1, the stator 2 faces the rotor 3 radially with a gap therebetween. In this embodiment, the stator 2 is arranged radially outside the rotor 3. The stator 2 includes a stator core 20, a winding portion 30, a plurality of insulating papers 6, a busbar unit 5, and a conductor holder 80.

[0017] As shown in Fig. 1, the stator core 20 is annular about the central axis J. The stator core 20 is composed of a plurality of electromagnetic steel sheets laminated along the axial direction. The stator core 20 has a cylindrical core back portion 21 centered on the central axis J and a plurality of teeth portions 22 extending radially inward from the core back portion 21.

[0018] The plurality of teeth portions 22 are arranged at equal intervals in the circumferential direction. An umbrella portion 22a is provided at the radially inner tip of the teeth portion 22. The umbrella portion 22a protrudes on both sides in the circumferential direction with respect to the teeth portion 22. That is, the circumferential dimension of the umbrella portion 22a is larger than the circumferential dimension of the teeth portion 22. The surface of the umbrella portion 22a facing radially inward faces the outer peripheral surface of the rotor 3 with a gap therebetween in the radial direction.

[0019] The winding portion 30 is mounted on the teeth portion 22. A slot S is provided between adjacent teeth portions 22 in the circumferential direction. That is, the stator core 20 is provided with a plurality of slots S arranged in the circumferential direction.

[0020] The conductor 50 of the winding portion 30 is accommodated in the slot S. Also, one insulating paper 6 is arranged in each slot S. The insulating paper 6 ensures insulation between the winding portion 30 and the stator core 20 within the slot S.

[0021] One slot S is provided with six layers of layers arranged radially. In one slot, one conductor 50 is arranged in each layer. Six conductors 50 are arranged in a row along the radial direction in the slot S.

[0022] The slot S has an opening 29h that opens radially inward. The opening 29h is located between umbrella portions 22a positioned at the tips of adjacent tooth portions 22. The width dimension along the circumferential direction of the opening 29h is smaller than the dimension along the circumferential direction of the conductor 50. For this reason, the conductor 50 has difficulty passing through the opening 29h, and detachment of the conductor 50 from the stator core 20 is suppressed.

[0023] In the present embodiment, the stator core 20 has 48 tooth portions 22. That is, the stator 2 of the present embodiment has 48 slots. Note that the number of slots of the stator 2 is appropriately set according to the number of poles of the rotor magnet 3b and the winding method of the winding portion 30.

[0024] FIG. 3 is a schematic diagram showing a circuit formed by the winding portion 30 and the bus bar unit 5 of the present embodiment. The winding portion 30 of the present embodiment has a plurality (six in the present embodiment) of conductor connectors 60 and constitutes a segment coil. The six conductor connectors 60 are classified into two U-phase conductor connectors 60U, two V-phase conductor connectors 60V, and two W-phase conductor connectors 60W. That is, the plurality of conductor connectors 60 are classified into a plurality of phases. Further, the plurality of conductor connectors 60 include a plurality of conductor connectors 60 of the same phase.

[0025] Also, although described in detail later, the bus bar unit 5 has three phase bus bars 11, 12, 13 and one neutral point bus bar 10. The three phase bus bars 11, 12, 13 are classified into a U-phase bus bar 11, a V-phase bus bar 12, and a W-phase bus bar 13.

[0026] The U-phase conductor connector 60U, the V-phase conductor connector 60V, and the W-phase conductor connector 60W are Y-connected by the neutral point bus bar 10 and the phase bus bars 11, 12, 13. In the present embodiment, two Y-connections corresponding to two conductor connectors 60 of each phase are formed, and the respective Y-connections are connected in parallel. That is, the winding portion 30 is 2Y-connected by the bus bar unit 5.

[0027] In addition, in this embodiment, the case where there are two conductors in the same phase in the winding portion 30 and the conductor connectors 60 of three phases and six conductors are provided has been described. However, if the winding portion 30 has at least two conductor connectors 60 in the same phase, and these form a pair of connectors 69 passing through the slots S adjacent to each other in the circumferential direction, the same winding configuration as in this embodiment can be adopted. Therefore, it is sufficient that the plurality of conductor connectors 60 are Y-connected with 2×M, where M is a natural number (in this embodiment, M = 2).

[0028] The conductor connector 60 has a first end portion 63 and a second end portion 64. The first end portion 63 and the second end portion 64 are respectively provided at one end and the other end of the conductor connector 60. The conductor connector 60 is mounted on the stator core 20 between the first end portion 63 and the second end portion 64 to form coils for each phase. The conductor connector 60 is connected to the bus bar unit 5 at the first end portion 63 and the second end portion 64.

[0029] The second end portions 64 of the two U-phase conductor connectors 60U, the two V-phase conductor connectors 60V, and the two W-phase conductor connectors 60W are connected to one neutral-point bus bar 10. As a result, the second end portions 64 of the six conductor connectors 60 are at the same potential and form a neutral point. That is, the neutral-point bus bar 10 constitutes the neutral point of the three-phase circuit.

[0030] The first end portions 63 of the two U-phase conductor connectors 60U are connected to the U-phase bus bar 11. The first end portions 63 of the two V-phase conductor connectors 60V are connected to the V-phase bus bar 12. The first end portions 63 of the two W-phase conductor connectors 60W are connected to the W-phase bus bar 13. Alternating currents with phases shifted by 120° each are passed through the phase bus bars 11, 12, and 13.

[0031] The two in-phase conductor connectors 60 are attached to the stator core 20 through the slots S adjacent to each other. In this specification, the two conductor connectors 60 passing through the slots S adjacent to each other are referred to as a connector pair 69. Further, in the following description, when distinguishing the two conductor connectors 60 forming the connector pair 69 from each other, one is called the first conductor connector 60A and the other is called the second conductor connector 60B.

[0032] FIG. 4 is a perspective view of the stator 2 of the present embodiment. FIG. 5 is a schematic diagram showing the winding configuration of the two conductor connectors 60 forming the connector pair 69.

[0033] As shown in FIG. 5, the conductor connector 60 is configured by connecting a plurality of conductors 50 in series. The conductor connector 60 is inserted into a plurality of slots S and arranged in a wavy shape.

[0034] The plurality of conductors 50 constituting the conductor connector 60 are classified into a first-end conductor 51, a hairpin conductor 52, a second-end conductor 53, and return conductors 54 and 55. That is, the plurality of conductors 50 include the first-end conductor 51, the hairpin conductor 52, the second-end conductor 53, and the return conductors 54 and 55.

[0035] Among the various conductors 50, the conductors 50 excluding the return conductors 54 and 55 (the first-end conductor 51, the hairpin conductor 52, and the second-end conductor 53) pass through the slots S in the straight portion 50a described later. The conductors 50 passing through these slots S are formed by bending a straight angle line. Therefore, compared with the case of using a round wire, the occupation ratio of the conductor 50 in the slot S can be improved. In this specification, the "straight angle line" is a wire having a rectangular or substantially rectangular cross-sectional shape. In this specification, the "substantially rectangular shape" includes a rounded rectangular shape with rounded corners of the rectangular shape. Although illustration is omitted, in the present embodiment, the conductor 50 has an enamel coating on its surface.

[0036] Among various conductors 50, the conductors 50 excluding the folding conductors 54 and 55 have at least a straight portion 50a extending linearly along the axial direction (Z direction) and a connecting portion 50j located at the lower end (the other side in the axial direction). The straight portion 50a passes through the slot S. That is, the conductor connector 60 is accommodated in the slot S at the straight portion 50a. The conductor connector 60 extends out above and below the stator core 20 in a region other than the straight portion 50a. The portions extending from above and below the stator core 20 constitute the coil ends 30e (see FIG. 1) of the stator core 20.

[0037] The connecting portion 50j is connected to the connecting portions 50j of other conductors 50. The connecting portions 50j of a pair of conductors 50 are joined to each other by joining means such as welding. The connecting portion 50j is bent in the circumferential direction after the conductor 50 is mounted on the stator core 20 and joined to the connecting portion 50j of another conductor 50. In the conductor 50 before being mounted on the stator core 20, the connecting portion 50j is linear and continuous with the straight portion 50a. The conductor 50 is attached to the stator core 20 by inserting the connecting portion 50j and the straight portion 50a into the slot S from above the stator core 20. The conductor 50 is prevented from axially detaching from the stator core 20 when the connecting portion 50j is bent in the circumferential direction and joined to another connecting portion 50j.

[0038] The stator 2 of this embodiment can be assembled by inserting a plurality of conductors 50 into the slots S of the stator core 20 from above and joining them below. Therefore, a complicated assembly process is not required, and the assembly process can be simplified.

[0039] Next, various conductors 50 will be described. The conductor 51 for the first end portion has one each of the first end portion 61a or the third end portion 62a, the straight portion 50a, and the connecting portion 50j. The first end portion 61a and the third end portion 62a are located at the upper end portion of the conductor 51 for the first end portion. The first end portion 61a and the third end portion 62a extend by extending the straight portion 50a upward. In the conductor 51 for the first end portion, the connecting portion 50j extends from the lower end of the straight portion 50a toward one side θ1 in the circumferential direction.

[0040] Two conductors 51 for the first end portion are provided in one conductor connecting body 60. Accordingly, one conductor connecting body 60 is provided with one each of the first end portion 61a and the third end portion 62a. The first end portion 61a and the third end portion 62a are end portions that constitute both end portions of the conductor connecting body 60. Of the first end portion 61a and the third end portion 62a of the conductor connecting body 60, the first end portion 61a is the first end portion 63, and the third end portion 62a is the second end portion 64. One of the U-phase bus bar 11, the V-phase bus bar 12, and the W-phase bus bar 13 is connected to the first end portion 63. The neutral point bus bar 10 is connected to the second end portion 64.

[0041] The hairpin conductor 52 has two straight portions 50a, two connecting portions 50j, and one bridging portion 50d. The bridging portion 50d is disposed at the upper end portion of the hairpin conductor 52. The bridging portion 50d bridges between the two straight portions 50a. That is, in the hairpin conductor 52, the two straight portions 50a are connected to each other via the bridging portion 50d. In the hairpin conductor 52, the two connecting portions 50j are connected to the lower ends of different straight portions 50a. A plurality of bridging portions 50d protrude from the end surface on the upper side (one axial side) of the stator core 20.

[0042] In the hairpin conductor 52, the two straight portions 50a are arranged side by side with the number of slots per pole s. Here, the number of slots per pole s means the number of slots S of the stator 2 arranged between one pole of the rotor 3 in the combination of the rotor 3 and the stator 2. The number of slots per pole s is calculated by (the total number of slots of the stator 2) / (the number of poles of the rotor 3). In the present embodiment, since the number of poles of the rotor 3 is 8 and the number of slots of the stator 2 is 48, the number of slots per pole s is 6. In the hairpin conductor 52, the two straight portions 50a are separated from each other by 6 slots in the circumferential direction.

[0043] In the hairpin conductor 52, the two connecting portions 50j are bent in directions opposite to each other in the circumferential direction. Of the two connecting portions 50j, one located on one side θ1 in the circumferential direction extends from the lower end of the straight portion 50a to one side θ1 in the circumferential direction, and the other located on the other side θ2 in the circumferential direction extends from the lower end of the straight portion 50a to the other side θ2 in the circumferential direction. The first conductor connector 60A and the second conductor connector 60B are each provided with six hairpin conductors 52.

[0044] The conductor for the second end 53 has one each of the second end 61b or the fourth end 62b, the straight portion 50a, and the connecting portion 50j. The second end 61b and the fourth end 62b are located at the upper ends of the conductor for the second end 53. The second end 61b and the fourth end 62b are bent in the circumferential direction with respect to the straight portion 50a. In the conductor for the second end 53, the second end 61b and the fourth end 62b and the connecting portion 50j extend in directions opposite to the circumferential direction with respect to the straight portion 50a. In the conductor for the second end 53, the second end 61b and the fourth end 62b extend from the upper end of the straight portion 50a to one side θ1 in the circumferential direction, and the connecting portion 50j extends from the lower end of the straight portion 50a to the other side θ2 in the circumferential direction.

[0045] Two conductors for the second end 53 are provided in one conductor connector 60. Therefore, one conductor connector 60 is provided with one each of the second end 61b and the fourth end 62b. The second end 61b and the fourth end 62b provided in one conductor connector 60 are connected by the conductors 54 and 55 for folding back.

[0046] The folding conductors 54 and 55 are classified into a first folding conductor 54 used for the first conductor connector 60A and a second folding conductor 55 used for the second conductor connector 60B. Therefore, one conductor connector 60 is provided with one of the first folding conductor 54 or the second folding conductor 55, i.e., one of the folding conductors 54 and 55.

[0047] In the first conductor connector 60A, the first folding conductor 54 connects the second end portion 61b and the fourth end portion 62b. Similarly, in the second conductor connector 60B, the second folding conductor 55 connects the second end portion 61b and the fourth end portion 62b. In the first conductor connector 60A and the second conductor connector 60B, the distances between the respective second end portions 61b and the fourth end portions 62b are different from each other. In the first conductor connector 60A, the second end portion 61b and the fourth end portion 62b are arranged at every pole slot number s + 1 (7 slots in this embodiment) in the circumferential direction. On the other hand, in the second conductor connector 60B, the second end portion 61b and the fourth end portion 62b are arranged at every pole slot number s - 1 (5 slots in this embodiment) in the circumferential direction. For this reason, the first folding conductor 54 has a circumferential crossing amount that is 2 slots larger than that of the second folding conductor 55. The specific shapes of the folding conductors 54 and 55 will be described in detail later with reference to FIG. 7 and the like.

[0048] Next, the winding configurations of the first conductor connector 60A and the second conductor connector 60B will be described. The first conductor connector 60A is wound in a wave shape every 6 slots toward one side θ1 in the circumferential direction from the first end portion 63 to the first folding conductor 54. Also, the first conductor connector 60A is wound in a wave shape every 6 slots toward one side θ1 in the circumferential direction from the second end portion 64 to the first folding conductor 54.

[0049] Here, in the first conductor connecting body 60A, the region that is wound in the one circumferential direction θ1 between the first end portion 63 and the first folding conductor 54 is referred to as the first portion 61. Also, in the first conductor connecting body 60A, the region that is wound in the one circumferential direction θ1 between the second end portion 64 and the first folding conductor 54 is referred to as the second portion 62. Further, the end portion on the other circumferential direction θ2 of the first portion 61 is referred to as the first end portion 61a. The end portion on the other circumferential direction θ2 of the second portion 62 is referred to as the third end portion 62a. Also, the end portions on the one circumferential direction θ1 of the first portion 61 are both referred to as the second end portion 61b. The end portion on the one circumferential direction θ1 of the second portion 62 is referred to as the fourth end portion 62b. In addition, in the first conductor connecting body 60A, the portion connecting the first portion 61 and the second portion 62 is referred to as the folding portion 67. The first conductor connecting body 60A has a first portion 61 that is wound from the first end portion 61a to the second end portion 61b in the one circumferential direction θ1, a second portion 62 that is wound from the third end portion 62a to the fourth end portion 62b in the one circumferential direction θ1, and a folding portion 67 that connects the first portion 61 and the second portion 62. The folding portion 67 of the first conductor connecting body 60A is constituted by the first folding conductor 54.

[0050] The second conductor connecting body 60B is wound every 6 slots in the one circumferential direction θ1 from the first end portion 63 to the second folding conductor 55. Also, the second conductor connecting body 60B is wound every 6 slots in the one circumferential direction θ1 from the second end portion 64 to the second folding conductor 55. Similar to the first conductor connecting body 60A, the second conductor connecting body 60B has a first portion 61, a second portion 62, and a folding portion 67. That is, the second conductor connecting body 60B has a first portion 61 that is wound from the first end portion 61a to the second end portion 61b in the one circumferential direction θ1, a second portion 62 that is wound from the third end portion 62a to the fourth end portion 62b in the one circumferential direction θ1, and a folding portion 67 that connects the first portion 61 and the second portion 62. The folding portion 67 of the second conductor connecting body 60B is constituted by the second folding conductor 55.

[0051] In a single conductor connector 60, the first portion 61 and the second portion 62 are wound in a wave shape so as to pass through different slots S respectively. Therefore, the first end 61a of the first portion 61 and the third end 62a of the second portion 62 protrude axially from different circumferential slots S. 。The The second end 61b of the first portion 61 and the fourth end 62b of the second portion 62 protrude axially from different circumferential slots S. The return conductors 54, 55 connect the second end 61b and the fourth end 62b extending from different slots S. In this embodiment, the first portion 61 of the first conductor connector 60A and the second portion 62 of the second conductor connector 60B pass through the same slot S. Similarly, the second portion 62 of the first conductor connector 60A and the first portion 61 of the second conductor connector 60B pass through the same slot S.

[0052] In this embodiment, the first end 61a, the second end 61b, the third end 62a, and the fourth end 62b all protrude upward (one axial side) with respect to the stator core 20. Therefore, the bus bars 10, 11, 12, 13 connected to the first end 61a and the third end 62a are arranged above the stator core 20. The return conductors 54, 55 connected to the second end 61b and the fourth end 62b are arranged above the stator core 20.

[0053] The conductor connector 60 of this embodiment is wound in a wave shape with the number of slots per pole s in the first portion 61 and the second portion 62. That is, the conductor connector 60 is attached to the stator core 20 in a full-pitch winding. Therefore, according to this embodiment, a plurality of conductors 50 arranged in the same slot S are all part of the same-phase conductor connector 60. According to this embodiment, it is not necessary to insulate different-phase conductor connectors 60 in one slot S, and it is easy to ensure insulation.

[0054] In the conductor connector 60 of the present embodiment, the folded-back portion 67 is constituted by a single conductor 50. That is, the plurality of conductors 50 includes the folding conductors 54 and 55 that constitute the folded-back portion 67. The folding conductors 54 and 55 connect the second end portion 61b of the first portion 61 and the fourth end portion 62b of the second portion 62 above the stator core 20.

[0055] Here, as a conventional structure, FIG. 11 schematically shows the folded-back portion 167 of the comparative example. The folded-back portion 167 of the comparative example is configured as a part of a hairpin-shaped conductor. The folded-back portions 167 of the comparative embodiment each extend upward from the straight portion 50a. For this reason, in order to suppress interference with the crossing portion 50d of the other conductor 50, the folded-back portion 167 of the comparative example has a retracted region 150A that protrudes above the upper end portion of the crossing portion 50d and above the crossing portion 50d. Further, the folded-back portion 167 of the comparative embodiment extends along the inclination direction of the crossing portion 50d in a region below the retracted region 150A in order to suppress interference with the crossing portion 50d. The crossing portion 50d inclines in one circumferential direction θ1 as it goes upward. For this reason, the folded-back portion 167 has a hairpin shape that makes a U-turn from one circumferential direction θ1 to the other circumferential direction θ2 in the retracted region 150A. Thus, the protruding height of the folded-back portion 167 of the comparative embodiment with respect to the crossing portion 50d of the retracted region 150A has been large. Further, the folded-back portion 167 of the comparative embodiment has a problem that it is necessary to have a complicated hairpin shape in the retracted region 150A and the assembling process is likely to be difficult.

[0056] On the other hand, according to the present embodiment, in the conductor connector 60, the folded-back portion 67 is constituted by the folding conductors 54 and 55 which are a single conductor 50. The folding conductors 54 and 55 do not pass through the slot S. For this reason, in the process of assembling the winding portion 30 to the stator core 20, the process of passing the folding conductors 54 and 55 through the slot S does not occur. As a result, even when the folding conductors 54 and 55 have a complicated shape, it is possible to suppress the complication of the assembling process of the winding portion 30.

[0057] Furthermore, since the conductor connecting body 60 of the present embodiment is configured such that the conductors 54 and 55 for folding can be separated from other conductors 50, the conductors 54 and 55 for folding can be made short and have a simple shape. As a result, the conductors 54 and 55 for folding can be manufactured at low cost, and the motor 1 can be manufactured at low cost.

[0058] In the present embodiment, the winding portion 30 has a first portion 61 and a second portion 62 having a plurality of crossover portions 50d and connecting portions 50j. The plurality of crossover portions 50d form coil ends 30e above the stator core 20. On the other hand, the connecting portion 50j forms coil ends 30e below the stator core 20.

[0059] The first end 61a of the first portion 61 and the third end 62a of the second portion 62 are arranged above the stator core 20 and on the outermost circumference of the coil end 30e. That is, the first end 61a and the third end 62a are located radially outside the plurality of crossover portions 50d. The first end 61a of the first portion 61 extends upward (one axial direction side) from the stator core 20 and is connected to the phase busbars 11, 12, and 13. Similarly, the third end 62a of the second portion 62 extends upward (one axial direction side) from the stator core 20 and is connected to the neutral point busbar 10. According to the present embodiment, since the first end 61a of the first portion 61 and the third end 62a of the second portion 62 are arranged on the outermost circumference of the coil end 30e, the busbar unit 5 can be arranged radially outside the coil end 30e. As a result, the vertical dimension of the motor 1 can be reduced as compared with the case where the busbar unit 5 is arranged above the coil end 30e.

[0060] Also, the second end portion 61b of the first portion 61 and the fourth end portion 62b of the second portion 62 are disposed above the stator core 20 and at the innermost circumference of the coil end 30e. That is, the second end portion 61b and the fourth end portion 62b are located radially inside the plurality of connecting portions 50d. For this reason, the folding conductor 54 is connected to the second end portion 61b and the fourth end portion 62b at the innermost circumference of the coil end 30e. According to the present embodiment, the joining step of the folding conductor 54 to the second end portion 61b and the fourth end portion 62b can be performed from the radially inner side of the coil end 30e, and the joining step can be easily performed.

[0061] <Folding conductor> FIG. 6 is a perspective view of the conductor holder 80 and the plurality of folding conductors 54 and 55. FIG. 7 is a perspective view of the plurality of folding conductors 54 and 55. The conductor holder 80 and the plurality of folding conductors 54 and 55 shown in FIG. 6 constitute the conductor unit 7. That is, the conductor unit 7 includes the conductor holder 80 and the plurality of folding conductors 54 and 55.

[0062] Six conductor connectors 60 are provided in the winding portion 30 of the present embodiment. For this reason, six folding conductors 54 and 55 are provided in the winding portion 30. The six folding conductors 54 and 55 are supported by one conductor holder 80.

[0063] As shown in FIG. 4, the conductor unit 7 is located above the stator core 20. Also, the conductor unit 7 is located further above the coil end 30e located above the stator core 20. The conductor unit 7 overlaps the coil end 30e when viewed from the axial direction.

[0064] As shown in FIG. 7, the six folding conductors 54 and 55 include three first folding conductors 54 and three second folding conductors 55. Also, the three first folding conductors 54 are the folded portions 67 of the conductor connectors 60 for the U-phase, V-phase, and W-phase, respectively. Similarly, the three second folding conductors 55 are the folded portions 67 of the conductor connectors 60 for the U-phase, V-phase, and W-phase, respectively.

[0065] In the following description, the first folding conductor 54 for the U-phase may be referred to as the first conductor 54U for the U-phase, and the second folding conductor 55 for the U-phase may be referred to as the second conductor 55U for the U-phase. Similarly, the first folding conductor 54 for the V-phase may be referred to as the first conductor 54V for the V-phase, and the second folding conductor 55 for the V-phase may be referred to as the second conductor 55V for the V-phase. Further, the first folding conductor 54 for the W-phase may be referred to as the first conductor 54W for the W-phase, and the second folding conductor 55 for the W-phase may be referred to as the second conductor 55W for the W-phase.

[0066] As described with reference to FIG. 5, the first folding conductor 54 straddles 7 slots S (slot number per pole s + 1), and the second folding conductor 55 straddles 5 slots S (slot number per pole s - 1). Further, the two slots S from which the first folding conductor 54 extends are arranged on the outer side in the circumferential direction with respect to the two slots S from which the second folding conductor 55 extends. As shown in FIG. 7, the first folding conductor 54 is arranged so as to straddle the second folding conductor 55 from both the radially outer side and both sides in the circumferential direction. As shown in FIG. 5, of the two conductor connectors 60 of the same phase passing through adjacent slots S, one (the second conductor connector 60B) extends between slots S separated by s - 1 by the second folding conductor 55, and the other (the first conductor connector 60A) extends between slots S separated by s + 1 by the first folding conductor 54. Further, this other one (the first conductor connector 60A) passes through the radially outer one side (the radially outer side in the present embodiment) of the second folding conductor 55 of the one (the second conductor connector 60B) by the first folding conductor 54. Thereby, it is possible to suppress the first folding conductor 54 and the second folding conductor 55 from increasing in size in the axial direction and the radial direction while suppressing mutual interference.

[0067] As shown in FIG. 7, the first folding conductor 54 has one conductor main body portion 54a, two radially extending portions 54b, and two connection terminals 54c. Similarly, the second folding conductor 55 has one conductor main body portion 55a, two radially extending portions 55b, and two connection terminals 55c.

[0068] The conductors 54 and 55 for folding may be formed by forming a flat angle line in the same manner as the other conductors 50. Further, the conductors 54 and 55 for folding may be formed by pressing a plate material in the same manner as the bus bars 10, 11, 12, and 13 described later. The conductors 54 and 55 for folding in the present embodiment do not pass through the slot S. For this reason, the conductors 54 and 55 for folding can adopt a processing method such as pressing that forms an unstable cross-sectional shape, and the motor 1 can be manufactured at low cost. That is, in the present embodiment, the conductors 54 and 55 for folding may be plate-shaped, and in this case, the conductors 54 and 55 for folding can be formed by pressing. The conductors 54 and 55 for folding can be easily press-formed by setting the axial direction as the plate thickness direction in the conductor main body portions 54a and 55a and the radially extending portions 54b and 55b, and setting the radial direction as the plate thickness direction in the connection terminals 54c and 55c.

[0069] In the conductors 54 and 55 for folding, the conductor main body portions 54a and 55a extend along the circumferential direction. The radially extending portions 54b and 55b are respectively provided at both ends of the conductor main body portions 54a and 55a. The radially extending portions 54b and 55b extend radially inward from the conductor main body portions 54a and 55a. The connection terminals 54c and 55c are provided at the radially inner ends of the radially extending portions 54b and 55b. That is, connection terminals 54c and 55c connected to the other conductors 50 are provided at both ends of the conductors 54 and 55 for folding. The connection terminals 54c and 55c extend upward from the radially extending portions 54b and 55b.

[0070] The conductor main body portions 54a and 55a of the first folding conductor 54 and the second folding conductor 55 extend in an arc shape centered on the central axis J, respectively. The conductor main body portions 54a of the three first folding conductors 54 (i.e., the first conductor 54U for the U phase, the first conductor 54V for the V phase, and the first conductor 54W for the W phase) are arranged on the same circumference when viewed from the axial direction. Similarly, the conductor main body portions 55a of the three second folding conductors 55 (i.e., the second conductor 55U for the U phase, the second conductor 55V for the V phase, and the second conductor 55W for the W phase) are arranged on the same circumference. The diameter of the circumference on which the conductor main body portion 54a of the first folding conductor 54 is arranged is larger than the diameter of the circumference on which the conductor main body portion 55a of the second folding conductor 55 is arranged. Therefore, the conductor main body portion 54a of the first folding conductor 54 passes through the radially outer side of the conductor main body portion 55a of the second folding conductor 55.

[0071] The first conductor 54U for the U phase and the second conductor 55U for the U phase are arranged at the same height in the vertical direction. Similarly, the first conductor 54V for the V phase and the second conductor 55V for the V phase are arranged at the same height in the vertical direction. The first conductor 54W for the W phase and the second conductor 55W for the W phase are arranged at the same height in the vertical direction. Also, the conductor main body portions 54a and 55a are arranged in this order upward for the U phase, V phase, and W phase. That is, above the conductor main body portion 54a for the U phase, the conductor main body portions 54a for the V phase and W phase are arranged, and above the conductor main body portion 55a for the U phase, the conductor main body portions 55a for the V phase and W phase are arranged. Above the conductor main body portion 54a for the V phase, the conductor main body portion 54a for the W phase is arranged, and above the conductor main body portion 55a for the V phase, the conductor main body portion 55a for the W phase is arranged. Note that in this specification, "directly above" means arranged above and at least partially overlapping when viewed from the vertical direction.

[0072] According to this embodiment, at least a part of the conductors 54 and 55 for folding different phases overlap each other when viewed axially. Therefore, compared with the case where the folding conductors of different phases are arranged side by side in the circumferential direction or the radial direction, the space for arranging the plurality of folding conductors 54 and 55 can be reduced in the circumferential direction and the radial direction. As a result, the stator 2 can be downsized. In addition, since the plurality of folding conductors 54 and 55 can be densely arranged in the circumferential direction and the radial direction, the conductor holder 80 for holding the plurality of folding conductors 54 and 55 can be downsized, and the stator 2 can be made lighter.

[0073] Also, according to this embodiment, by arranging the heights of the folding conductors 54 and 55 for each phase to be different, the folding conductors 54 and 55 of different phases can have the same shape. Furthermore, in this embodiment, by arranging the folding conductors 54 and 55 of different phases to be shifted in the circumferential direction, the connection terminals 54c and 55c of different phases can be arranged to be separated in the circumferential direction. That is, in this embodiment, the folding conductors 54 and 55 of different phases have the same shape and are arranged to be shifted from each other in the circumferential direction. More specifically, the U-phase first conductor 54U, the V-phase first conductor 54V, and the W-phase first conductor 54W of this embodiment have the same shape. Similarly, the U-phase second conductor 55U, the V-phase second conductor 55V, and the W-phase second conductor 55W of this embodiment have the same shape. According to this embodiment, parts having the same shape can be used as the folding conductors 54 and 55 for each phase, an increase in the number of parts constituting the winding portion 30 can be suppressed, and the stator 2 can be manufactured at low cost.

[0074] According to this embodiment, the folding conductors 54 and 55 of different phases are arranged to be shifted in the circumferential direction and the axial direction, so that they are arranged in a stepped manner when viewed from the radial direction. That is, the folding conductors 54 and 55 of the U-phase, V-phase, and W-phase are arranged side by side from the lower side to the upper side and from one side θ1 in the circumferential direction to the other side θ2 in the circumferential direction. Thereby, while arranging the connection terminals 54c and 55c of different phases to be separated in the circumferential direction, the folding conductors 54 and 55 of different phases can be partially overlapped and densely arranged, and the conductor unit 7 can be downsized.

[0075] As described above, among the in-phase return conductors 54 and 55, one conductor main body portion 54a is disposed radially outside the other conductor main body portion 55a. Therefore, in the present embodiment, the in-phase return conductors 54 and 55 overlap in the radial direction at the conductor main body portions 54a and 55a. That is, the in-phase return conductors 54 and 55 are arranged at the same height as each other. If all the return conductors 54 and 55 are stacked in the axial direction, the axial dimension increases. On the other hand, by arranging the in-phase return conductors 54 and 55 among the plurality of return conductors 54 and 55 so as to overlap in the radial direction, it is possible to suppress the axial dimension of the arrangement space of the return conductors 54 and 55 from becoming too large, and the motor 1 can be downsized.

[0076] According to the present embodiment, the return conductors 54 and 55 are arranged directly above the coil end 30e. The return conductors 54 and 55 are arranged radially outside the connected second end portion 61b and fourth end portion 62b and overlap in the axial direction. Therefore, the amount of protrusion upward with respect to the coil end 30e can be suppressed as compared with the case where the folded portion 167 is retracted upward as in the comparative embodiment of FIG. 11. Thereby, the motor 1 can be downsized.

[0077] As shown in FIG. 6, the connection terminals 54c and 55c of the return conductors 54 and 55 are exposed from the conductor holder 80. The second end portion 61b of the first portion 61 or the fourth end portion 62b of the second portion 62 is connected to the connection terminals 54c and 55c. The connection terminals 54c and 55c, the second end portion 61b, and the fourth end portion 62b all extend along the axial direction. The connection terminals 54c and 55c and the second end portion 61b face each other and contact each other, and are electrically and mechanically connected. The connection terminals 54c and 55c and the fourth end portion 62b face each other and contact each other, and are electrically and mechanically connected.

[0078] The conductor unit 7 is provided with a total of 12 connection terminals 54c and 55c. All the connection terminals 54c and 55c of the conductor unit 7 are arranged on the same circumference centered on the central axis J. Thereby, in the joining process of the connection terminals 54c and 55c with the second end portion 61b or the fourth end portion 62b, the joining jig (for example, the electrode pair for resistance welding) and the stator 2 can be continuously joined while being relatively rotated around the central axis J, and the tact time of the joining process can be shortened.

[0079] The conductor holder 80 is made of an insulating resin member. The conductor holder 80 is formed by insert molding in which a part of the folding conductors 54 and 55 is embedded. More specifically, the conductor holder 80 embeds the conductor main body portions 54a and 55a and the radially extending portions 54b and 55b of the folding conductors 54 and 55, and exposes the connection terminals 54c and 55c. Thereby, the conductor holder 80 holds the folding conductors 54 and 55 of the plurality of conductor connectors 60.

[0080] The conductor holder 80 has a plurality (five in this embodiment) of wall portions 81. The wall portions 81 extend along the radial direction and the axial direction. The plurality of wall portions 81 are arranged along the circumferential direction. In the conductor unit 7, the connection terminals 54c and 55c of the U-phase, the connection terminals 54c and 55c of the V-phase, and the connection terminals 54c and 55c of the W-phase are arranged side by side in the circumferential direction in pairs. The wall portion 81 is arranged between the connection terminal 55c of the U-phase and the connection terminal 54c of the V-phase, between the connection terminal 55c of the V-phase and the connection terminal 54c of the W-phase, and between the connection terminal 55c of the W-phase and the connection terminal 54c of the U-phase.

[0081] According to the present embodiment, the wall portion 81 of the conductor holder 80 is arranged between the connection terminals 54c and 55c of the folding conductors 54 and 55 of different phases. Thereby, the wall portion 81 can enhance the insulation between the connection terminals 54c and 55c of different phases, and can enhance the reliability of the conductor unit 7.

[0082] FIG. 9 is a partial cross-sectional view of the motor 1 of the embodiment. The cross-sectional line in FIG. 9 passes through the first end portion 61a and the fourth end portion 62b of the conductor connector 60.

[0083] The plurality of conductors 54, 55 for folding are arranged in the radial direction between the first end portions 61a and 62a and the second end portions 61b and 62b. That is, the plurality of conductors 54, 55 for folding are arranged in the radial direction between the first end portion 61a and the second end portion 61b. Thereby, the bus bars 10, 11, 12, 13 connected to the first end portions 61a and 62a and the conductors 54, 55 for folding connected to the second end portions 61b and 62b can be concentrated and arranged in the circumferential direction and the axial direction, and the size of the motor 1 can be reduced. In addition, the joint portions of the bus bars 10, 11, 12, 13 with respect to the first end portions 61a and 62a and the joint portions of the conductors 54, 55 for folding with respect to the second end portions 61b and 62b can be arranged close to each other in the circumferential direction. Therefore, in the process of joining the joint portions (for example, the welding process), the moving distance of the joining jig can be shortened, and the tact time of the joining process can be shortened.

[0084] The circumferential positions of the plurality of conductors 54, 55 for folding overlap with the circumferential position of the first end portion 61a, the circumferential position of the second end portion 61b, the circumferential position of the third end portion 62a, and the axial position of the fourth end portion 62b. Further, the axial positions of the plurality of conductors 54, 55 for folding overlap with the circumferential position of the first end portion 61a, the axial position of the second end portion 61b, the axial position of the third end portion 62a, and the axial position of the fourth end portion 62b. Therefore, the conductor unit 7 can be arranged compactly with respect to the coil end 30e.

[0085] <Bus bar unit> As shown in FIG. 4, the bus bar unit 5 is arranged above the stator 2. More specifically, the bus bar unit 5 is arranged above the core back portion 21 and radially outside the coil end 30e. Therefore, the bus bar unit 5 faces the coil end 30e in the radial direction. The bus bar unit 5 is connected to the first end portion 61a and the third end portion 62a of the conductor connecting body 60 extending from the coil end 30e.

[0086] FIG. 8 is a perspective view of the bus bar unit 5. In FIG. 8, the bus bar holder 90 of the bus bar unit 5 is indicated by a two-dot chain line.

[0087] The bus bar unit 5 includes a neutral point bus bar 10, a plurality of phase bus bars 11, 12, 13, and a bus bar holder 90. That is, the stator 2 includes a neutral point bus bar 10, a plurality of phase bus bars 11, 12, 13, and a bus bar holder 90. The neutral point bus bar 10 is connected to the first end portion 61a of the first portion 61, and the phase bus bars 11, 12, 13 are connected to the third end portion 62a of the second portion 62 (see FIG. 5).

[0088] The neutral point bus bar 10 and the phase bus bars 11, 12, 13 are plate-shaped with the radial direction being the plate thickness direction. The neutral point bus bar 10 and the phase bus bars 11, 12, 13 are formed by press working. The neutral point bus bar 10 and the phase bus bars 11, 12, 13 extend along the circumferential direction.

[0089] As shown in FIG. 8, the neutral point bus bar 10 is disposed inside the phase bus bars 11, 12, 13 in the radial direction. The neutral point bus bar 10 includes a neutral point bus bar main body portion 10a, a plurality (six in this embodiment) of neutral point connection portions 10b, an upper extension portion 10c, and an external connection terminal 10d.

[0090] The neutral point bus bar main body portion 10a extends in an arc shape centered on the central axis J as viewed from the axial direction. The neutral point bus bar main body portion 10a has the radial direction as the plate thickness direction.

[0091] The upper extension portion 10c of the neutral point bus bar 10 extends upward from the end portion on one circumferential side θ1 of the neutral point bus bar main body portion 10a. Further, the external connection terminal 10d is disposed at the upper end of the upper extension portion 10c. The external connection terminal 10d extends along a plane orthogonal to the central axis J. An external terminal (not shown) connected to the inverter is connected to the external connection terminal 10d.

[0092] The neutral - point connection part 10b protrudes upward from the neutral - point busbar main body part 10a. A plurality of neutral - point connection parts 10b are arranged on the same circumference centered on the central axis J. The neutral - point connection part 10b extends in the vertical direction with a uniform width. The shapes of all the neutral - point connection parts 10b are identical to each other. Each neutral - point connection part 10b is connected to the second end part 64 extending radially outward from the coil end 30e by joining means such as welding. That is, the neutral - point busbar 10 is connected to the second end part 64 of the conductor connector 60 at the neutral - point connection part 10b (see FIG. 3).

[0093] The phase busbars 11, 12, 13 each have a phase - busbar main body part 11a, 12a, 13a, a plurality (two in this embodiment) of phase - connection parts 11b, 12b, 13b, upper - extending parts 11c, 12c, 13c, and external - connection terminals 11d, 12d, 13d.

[0094] The phase - busbar main body parts 11a, 12a, 13a of the respective phase busbars 11, 12, 13 have different shapes from each other. At least a part of the phase - busbar main body parts 11a, 12a, 13a of the three phase busbars 11, 12, 13 overlaps the neutral - point busbar 10 either radially outward or in the axial direction.

[0095] In the phase busbars 11, 12, 13, the phase - connection parts 11b, 12b, 13b protrude upward from the phase - busbar main body parts 11a, 12a, 13a. A plurality of phase - connection parts 11b, 12b, 13b are arranged on the same circumference centered on the central axis J. The phase - connection parts 11b, 12b, 13b extend in the vertical direction with a uniform width. The shapes of all the phase - connection parts 11b, 12b, 13b are identical to each other. Also, the phase - connection parts 11b, 12b, 13b and the neutral - point connection part 10b have the same shape as each other. Each phase - connection part 11b, 12b, 13b is joined to the first end part 63 extending radially outward from the coil end 30e by joining means such as welding (see FIG. 3).

[0096] In this embodiment, the axial positions of all the phase connection portions 11b, 12b, 13b of all the phase busbars 11, 12, 13 and the neutral point connection portion 10b overlap with each other. The phase connection portions 11b, 12b, 13b and the neutral point connection portion 10b are connected to the first end portion 61a (the first terminal portion 63) or the third end portion 62a (the second terminal portion 64) by joining means such as welding. According to this embodiment, since the axial positions of all the phase connection portions 11b, 12b, 13b and the neutral point connection portion 10b coincide with each other, the joining device used for each joining means, such as the electrode pair for resistance welding, can be moved in the axial direction without moving, and the phase connection portions 11b, 12b, 13b and the neutral point connection portion 10b can be joined. As a result, the joining process can be simplified.

[0097] In this embodiment, all the phase connection portions 11b, 12b, 13b of all the phase busbars 11, 12, 13 and the neutral point connection portion 10b are arranged on the same circumference centered on the central axis J. Thereby, in the joining process of the phase connection portions 11b, 12b, 13b and the neutral point connection portion 10b with the first end portion 61a and the third end portion 62a, the joining jig and the stator 2 can be continuously joined while being relatively rotated around the central axis J. Thereby, the tact time of the joining process can be shortened, and as a result, the joining process can be simplified.

[0098] The upper extending portions 11c, 12c, 13c of the phase busbars 11, 12, 13 extend upward from the end portions on one side θ1 in the circumferential direction of the respective phase busbar main body portions 11a, 12a, 13 a a. Further, the external connection terminals 11d, 12d, 13d are each arranged at the upper ends of the upper extending portions 11c, 12c, 13c . The external connection terminal 10d extends along a plane orthogonal to the central axis J. External terminals (not shown) for applying the voltages of the U phase, V phase, and W phase are connected to the external connection terminals 11d, 12d, 13d, respectively.

[0099] In this embodiment, the neutral bus bar 10 and the phase bus bars 11, 12, and 13 are arranged to overlap in the radial direction. Therefore, even if the neutral bus bar 10 and the phase bus bars 11, 12, and 13 are widened to increase the cross-sectional area, the radial dimension does not increase. According to the motor 1 of this embodiment, it is possible to suppress an increase in the radial dimension while increasing the cross-sectional area of the neutral bus bar 10 and the phase bus bars 11, 12, and 13 in response to an increase in the current. In particular, according to this embodiment, the neutral bus bar 10 and the phase bus bars 11, 12, and 13 are plate-shaped with the radial direction as the plate thickness direction. Therefore, by arranging the neutral bus bar 10 and the phase bus bars 11, 12, and 13 to overlap in the radial direction, it is possible to effectively suppress an increase in the radial dimension side.

[0100] (Bus bar holder) The bus bar holder 90 is made of an insulating resin member. The bus bar holder 90 is formed by insert molding in which a part of the neutral bus bar 10 and the plurality of phase bus bars 11, 12, and 13 are embedded. Thereby, the bus bar holder 90 holds the neutral bus bar 10 and the phase bus bars 11, 12, and 13.

[0101] The bus bar holder 90 has a holder main body portion 91, a plurality (four in this embodiment) of support portions 92, and a plurality (five in this embodiment) of partition wall portions 93. The bus bar holder 90 is mounted on the core back portion 21 of the stator core 20. The bus bar holder 90 is fixed to the stator core 20, for example. The bus bar holder 90 may be fixed to the housing 1a (see FIG. 1).

[0102] The holder main body portion 91 embeds the neutral bus bar main body portion 10a of the neutral bus bar 10 and the phase bus bar main body portions 11a, 12a, and 13a of the phase bus bars 11, 12, and 13. The holder main body portion 91 exposes the neutral connection portion 10b and the phase connection portions 11b, 12b, and 13b from the upper end surface.

[0103] The support portion 92 extends upward from the holder main body portion 91. The plurality of support portions 92 embed the upper extending portions 10c, 11c, 12c, and 13c of the neutral point bus bar 10 and the phase bus bars 11, 12, and 13, respectively. Thereby, the support portion 92 supports the upper extending portions 10c, 11c, 12c, and 13c.

[0104] The partition wall portion 93 extends along the radial direction and the axial direction. The plurality of partition wall portions 93 are arranged along the circumferential direction. In the bus bar unit 5, the neutral point connection portions 10b and the phase connection portions 11b, 12b, and 13b are alternately arranged in pairs in the circumferential direction. The partition wall portion 93 is arranged between the neutral point connection portion 10b and the phase connection portions 11b, 12b, and 13b. Thereby, the partition wall portion 93 can enhance the insulation between the neutral point connection portion 10b and the second end portion 64 of different phases and the phase connection portions 11b, 12b, and 13b and the first end portion 63, and can enhance the reliability of the bus bar unit 5.

[0105] <Modification> FIG. 10 is a partial cross-sectional schematic view of the motor 101 of the modification. The motor 101 of this modification is mainly different from the above-described embodiment in that , lead the body holder portion (conductor holder) 180 and the bus bar holder portion (bus bar holder) 190 are formed from a single member (resin holder 107).

[0106] Similar to the above-described embodiment, the plurality of bus bars 10, 11, 12, and 13 are arranged above the core back portion 21 of the stator core 20 and radially outside the coil end 30e. Also, the folding conductors 54 and 55 are arranged directly above the coil end 30e located above the stator core 20.

[0107] The stator 102 of this embodiment has a resin holder 107. The resin holder 107 has a conductor holder portion 180 and a bus bar holder portion 190. That is, the stator 102 has a conductor holder portion 180 and a bus bar holder portion 190. The conductor holder portion 180 holds a plurality of folding conductors 54 and 55. Similarly, the bus bar holder portion 190 holds a plurality of bus bars 10, 11, 12, and 13.

[0108] The resin holder 107 is mounted on the core back portion 21 of the stator 102. The resin holder 107 is fixed to the stator core 20, for example, in the conductor holder portion 180. The resin holder 107 may be fixed to the housing 1a.

[0109] According to the motor 101 of this modification example, the number of parts can be reduced and the assembly process can be simplified as compared with the case of having a member for holding the folding conductors 54 and 55 and a member for holding the bus bars 10, 11, 12, and 13, respectively.

[0110] According to the resin holder 107 of this modification example, the conductor holder portion 180 that holds a plurality of folding conductors 54 and 55 and the bus bar holder portion 190 that holds a plurality of bus bars 10, 11, 12, and 13 are a single member. Therefore, compared with the case where the conductor holder portion 180 and the bus bar holder portion 190 are arranged individually, the rigidity of each can be increased, and the vibration applied to the folding conductors 54 and 55 and the bus bars 10, 11, 12, and 13 can be suppressed. As a result, the load applied to the joint portion such as the welded portion can be reduced, and the reliability of the stator 102 can be improved.

[0111] In this modification example, the case where the conductor holder portion 180 and the bus bar holder portion 190 are formed of a single member has been described. However, if the bus bar holder portion 190 supports the conductor holder portion 180, a certain effect of suppressing the vibration applied to the folding conductors 54 and 55 and the bus bars 10, 11, 12, and 13 can be obtained. That is, bus bar holder part 190 andThe conductor holder part 180 does not necessarily have to be a single member as long as the bus bar holder part 190 and the conductor holder part 180 are fixed to each other.

[0112] As described above, various embodiments of the present invention have been explained. However, each configuration and their combinations in each embodiment are merely examples, and additions, omissions, substitutions, and other changes to the configuration are possible without departing from the spirit of the present invention. Further, the present invention is not limited by the embodiments. For example, in the above-described embodiment, the case where the motor 1 is a three-phase motor has been described, but other motors such as a five-phase motor may also be used.

[0113] For example, in the above-described embodiment, the case where the first end portion 61a of the first portion 61 and the third end portion 62a of the second portion 62 are arranged on the radially outer side of the coil end 30e, and the second end portion 61b of the first portion 61 and the fourth end portion 62b of the second portion 62 are arranged on the radially inner side of the coil end 30e has been described. However, the radial inside / outside relationship of the first end portion 61a, the second end portion 61b, the third end portion 62a, and the fourth end portion 62b with respect to the coil end 30e may be opposite to that of the embodiment. That is, the first end portion 61a of the first portion 61 and the third end portion 62a of the second portion 62 may be arranged on the radially inner side of the coil end 30e, and the second end portion 61b of the first portion 61 and the fourth end portion 62b of the second portion 62 may be arranged on the radially outer side of the coil end 30e. In this case, the folding conductors 54 and 55 are connected to other conductors at the radially outer end of the coil end 30e. Further, the bus bars 10, 11, 12, and 13 are connected to the winding portion 30 on the radially inner side of the coil end 30e.

Explanation of reference numerals

[0114] 1,101… motor, 2,102… stator, 3… rotor, 10… bus bar, 11… phase bus bar, 20… stator core, 50… conductor, 54, 55… conductor for folding back, 54c, 55c… connection terminal, 60… conductor connector, 60A… first conductor connector (conductor connector), 60B… second conductor connector (conductor connector), 61… first part, 61a… first end, 61b… second end, 62… second part, 62a… third end, 62b… fourth end, 67, 167… folding part, 80… conductor holder, 81… wall part, 90… bus bar holder, 190… bus bar holder part (bus bar holder), 180… conductor holder part (conductor holder) 、J … central axis, S… slot, s… number of slots per pole, θ1… one side in the circumferential direction, θ2… the other side in the circumferential direction

Claims

1. A rotor rotatable about a central axis, and a stator disposed radially outside the rotor, comprising: The stator includes: a stator core provided with a plurality of slots arranged in the circumferential direction; a plurality of conductor connectors formed by connecting a plurality of conductors in series and inserted into the plurality of slots; The conductor connector has: a first portion wound in a circumferentially one-sided direction from a first end to a second end; a second portion wound in a circumferentially one-sided direction from a third end to a fourth end; and a folded-back portion connecting the first portion and the second portion; The second end of the first portion and the fourth end of the second portion project axially from different slots in the circumferential direction; The plurality of conductors include a folding conductor that connects the second end of the first portion and the fourth end of the second portion and forms the folded-back portion; The first end, the second end, the third end, and the fourth end all project axially on one side with respect to the stator core; The folding conductor is disposed radially between the first end and the second end; A motor.

2. A rotor rotatable about a central axis, and a stator disposed radially outside the rotor, comprising: The stator includes: a stator core provided with a plurality of slots arranged in the circumferential direction; a plurality of conductor connectors formed by connecting a plurality of conductors in series and inserted into the plurality of slots; The conductor connector has: a first portion wound in a circumferentially one-sided direction from a first end to a second end; a second portion wound in a circumferentially one-sided direction from a third end to a fourth end; and a folded-back portion connecting the first portion and the second portion; The second end of the first portion and the fourth end of the second portion project axially from different slots in the circumferential direction; The plurality of conductors include a folding conductor that connects the second end of the first portion and the fourth end of the second portion and forms the folded-back portion; The plurality of conductor connectors are classified into a plurality of phases, and at least a part of the folding conductors of different phases overlap each other when viewed axially; A motor.

3. The folding conductors of different phases have the same shape as each other and are arranged offset from each other in the circumferential direction. The motor according to Claim 2.

4. The folding conductors of different phases are arranged in a stepped manner when viewed radially. The motor according to Claim 3.

5. A rotor rotatable about a central axis, and a stator disposed radially outside the rotor, comprising: The stator includes: a stator core provided with a plurality of slots arranged in the circumferential direction; and a plurality of conductor connectors formed by connecting a plurality of conductors in series and inserted into the plurality of slots. The conductor connector has: a first portion wound in a wave shape from a first end portion to a second end portion toward one side in the circumferential direction; a second portion wound in a wave shape from a third end portion to a fourth end portion toward one side in the circumferential direction; and a folded-back portion connecting the first portion and the second portion. The second end portion of the first portion and the fourth end portion of the second portion protrude axially from different slots in the circumferential direction. The plurality of conductors include folding conductors that connect the second end portion of the first portion and the fourth end portion of the second portion and form the folded-back portion. The plurality of conductor connectors include a plurality of conductor connectors in the same phase. The folding conductors in the same phase overlap in the radial direction. A motor.

6. The folding conductor has: a conductor main body portion extending along the circumferential direction; radial extension portions respectively extending radially from both end portions of the conductor main body portion; and connection terminals extending axially from end portions of the radial extension portions. The folding conductors in the same phase overlap in the radial direction at the conductor main body portion. The motor according to claim 5.

7. The folding conductor is plate-shaped, with the axial direction being the plate thickness direction at the conductor main body portion and the radial extension portions, and the radial direction being the plate thickness direction at the connection terminals. The motor according to claim 6.

8. Let the number of slots per pole be s. Of two conductor connectors in the same phase passing through adjacent slots, one extends between the slots separated by s - 1 by the folding conductor, and the other extends between the slots separated by s + 1 by the folding conductor and passes through one side in the radial direction of the folding conductor of one of the conductor connectors. The motor according to any one of claims 5 to 7.

9. A rotor rotatable about a central axis, and a stator disposed radially outside the rotor, comprising: The stator includes: a stator core provided with a plurality of slots arranged in the circumferential direction; and a plurality of conductor connectors formed by connecting a plurality of conductors in series and inserted into the plurality of slots. The conductor connector has: a first portion that is wound in a wave shape from a first end portion toward one side in the circumferential direction to a second end portion; a second portion that is wound in a wave shape from a third end portion toward one side in the circumferential direction to a fourth end portion; and a folded-back portion that connects the first portion and the second portion, wherein the second end portion of the first portion and the fourth end portion of the second portion protrude axially from different slots in the circumferential direction; the plurality of conductors includes a folding-back conductor that connects the second end portion of the first portion and the fourth end portion of the second portion and constitutes the folded-back portion; the stator has a conductor holder that holds the folding-back conductors of the plurality of conductor connectors; the plurality of conductor connectors are classified into a plurality of phases; connection terminals that are connected to other conductors are provided at both ends of the folding-back conductor; the conductor holder has a wall portion that is disposed between the connection terminals of the folding-back conductors of different phases; a motor.

10. The stator includes a phase bus bar connected to the first end portion, a neutral point bus bar connected to the third end portion, and a bus bar holder that holds the neutral point bus bar and the phase bus bar, wherein the bus bar holder supports the conductor holder. The motor according to claim 9.

11. The bus bar holder and the conductor holder are a single member. The motor according to claim 10.

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