Stator and motor

Abstract

According to one embodiment of the present invention, a motor is provided with: an annular stator core having a plurality of teeth extending in the radial direction; and a plurality of conductor connection bodies each having a plurality of conductors connected to each other. The conductor connecting body is wound in a wave shape along the circumferential direction of the stator core in each slot between the plurality of teeth. The plurality of conductor connecting bodies are arranged in layers in the radial direction in the groove. Among the layers provided with the conductor connecting bodies in the grooves, the layer closest to the radial outer side is set as the outermost layer, and the layer closest to the radial inner side is set as the innermost layer. Each conductor connection body has a first end portion and a second end portion as both end portions. At least one of the plurality of first end portions and the plurality of second end portions is drawn out from the outermost layer of the groove toward one side in the axial direction. At least one of the plurality of first end portions and the plurality of second end portions is drawn out from the innermost layer of the groove toward one side in the axial direction.

Description

Technical Field

[0001] The present invention relates to a stator and a motor.

[0002] This application claims priority based on Japanese Patent Application No. 2022-085175 filed in Japan on May 25, 2022, the contents of which are cited here. Background Art

[0003] In order to improve the efficiency of the motor, a stator with a winding structure using a plurality of segment coils is being developed. Such a stator has a bus bar for supplying current to the segment coils. Patent document 1 discloses a bus bar connected to the segment coil from the radially outer side of the coil end.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-25745 Summary of the invention

[0007] Problems to be solved by the invention

[0008] When the connection positions of the segment coils and the connection objects (e.g., busbars) are concentratedly arranged radially outside or inside the winding portion formed by the segment coils as in the prior art, the connection portions are arranged over a wide range in the circumferential direction. Therefore, there is a problem that the component of the connection object is enlarged in the circumferential direction, and interference with other components and resonance with vibration are likely to become problems.

[0009] The present invention has been made in view of the above circumstances, and one object of the present invention is to provide a stator capable of arranging the end portions of the segment coils in a concentrated manner in the circumferential direction, and a motor having such a stator.

[0010] Means for solving problems

[0011] One embodiment of the present invention is a motor, which has: a stator core, which is annular and has a plurality of teeth extending in the radial direction; and a plurality of conductor connectors, each of which has a plurality of conductors connected to each other. The conductor connector is wave-wound in each slot between the plurality of teeth along the circumferential direction of the stator core. The plurality of conductor connectors are arranged in layers arranged in the radial direction in the slot. The radially outermost layer of each layer in which the conductor connector is arranged in the slot is set as the outermost layer, and the radially innermost layer is set as the innermost layer. Each of the conductor connectors has a first terminal portion and a second terminal portion as two end portions. At least one of the plurality of first terminal portions and the plurality of second terminal portions is led out from the outermost layer of the slot to one side in the axial direction. At least one of the plurality of first terminal portions and the plurality of second terminal portions is led out from the innermost layer of the slot to one side in the axial direction.

[0012] Effects of the Invention

[0013] According to one aspect of the present invention, it is possible to provide a stator capable of arranging the end portions of the segment coils in a concentrated manner in the circumferential direction, and a motor having such a stator. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The figure is a cross-sectional schematic diagram of a motor according to an embodiment.

[0015] Figure 2 It is along Figure 1 A cross-sectional view of the motor along line II-II.

[0016] Figure 3 The diagram is a schematic diagram of a circuit composed of a winding portion and a bus bar unit according to one embodiment.

[0017] Figure 4 It is a perspective view of a stator according to one embodiment.

[0018] Figure 5 This is a schematic diagram showing a winding structure of two conductor connections of the same phase according to one embodiment.

[0019] Figure 6 This is a schematic diagram of a winding structure of two conductor coupling bodies of a U phase according to one embodiment.

[0020] Figure 7 This is a schematic diagram of a winding structure of a conductor connection body of a U-phase, a V-phase, and a W-phase according to one embodiment.

[0021] Figure 8 is a top view of a stator according to one embodiment.

[0022] Fig. 9 It is a perspective view of a bus bar unit according to one embodiment.

[0023] Fig.10 This is a perspective view of a bus bar unit according to one embodiment, in which a bus bar holder is omitted. DETAILED DESCRIPTION

[0024] The Z-axis direction appropriately shown in each figure is the up-down direction with the positive side as the "upper side" and the negative side as the "lower side". The center axis J appropriately shown in each figure is an imaginary line parallel to the Z-axis direction and extending in the up-down direction. In the following description, the axial direction of the center axis J, that is, the direction parallel to the up-down direction, is sometimes referred to as the "axial direction", the upper side is referred to as the "one axial side", and the lower side is referred to as the "other axial side". In addition, the radial direction centered on the center axis J is sometimes referred to as the "radial direction". Moreover, the circumferential direction centered on the center axis J is sometimes referred to as the "circumferential direction", the counterclockwise direction when viewed from the upper side is referred to as the "one circumferential side θ1", and the clockwise direction when viewed from the upper side is referred to as the "other circumferential side θ2".

[0025] In addition, the up-down direction, the upper side, and the lower side are merely names for describing the configuration relationship of each part, and the actual configuration relationship may be a configuration relationship other than the configuration relationship represented by these names. Furthermore, even when the directions described as the axial one side and the axial other side are interchanged, the effects of the embodiment can be reproduced. Similarly, when the directions described as the circumferential one side θ1 and the circumferential other side θ2 are interchanged, the effects of the embodiment can be reproduced.

[0026] <Motor>

[0027] Figure 1 It is a schematic cross-sectional view of the motor 1 according to the present embodiment.

[0028] The motor 1 of the present embodiment is an inner rotor type motor. In addition, the motor 1 of the present embodiment is a three-phase AC motor. The center of the motor 1 is the central axis J. The motor 1 has a rotor 3, a stator 2, a bearing holder 4, and a housing 1a, and the housing 1a accommodates the rotor 3, the stator 2, and the bearing holder 4.

[0029] <Rotor>

[0030] The rotor 3 is rotatable about the central axis J. The rotor 3 is arranged radially inside the annular stator 2. The rotor 3 includes a shaft 3a, a rotor magnet 3b, and a rotor core 3c.

[0031] The shaft 3a extends in the axial direction along the central axis J. The shaft 3a has, for example, a cylindrical shape extending in the axial direction around the central axis J. The shaft 3a is supported by two bearings 3p so as to be rotatable around the central axis J.

[0032] Figure 2 It is along Figure 1 A cross-sectional view of the motor 1 taken along line II-II.

[0033] The rotor core 3c is formed by stacking electromagnetic steel plates. The rotor core 3c is in the shape of a tube extending in the axial direction. The inner circumference of the rotor core 3c is fixed to the outer circumference of the shaft 3a. The rotor core 3c is provided with a plurality of retaining holes 3h extending in the axial direction. The rotor magnet 3b is inserted and fixed in the retaining hole 3h.

[0034] The rotor magnet 3b is radially opposed to the stator 2. 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. The number of poles of the rotor 3 is not limited to this embodiment. In addition, the rotor magnet 3b may also be a magnet of other forms such as an annular ring magnet.

[0035] <Stator>

[0036] The stator 2 and the rotor 3 are radially opposed to each other with a gap therebetween. In the present embodiment, the stator 2 is arranged radially outside the rotor 3. The stator 2 includes a stator core 20, a winding portion 30, and a plurality of insulating papers 6. Figure 1 As shown, the stator 2 has a busbar unit 5 .

[0037] like Figure 2 As shown, the stator core 20 is annular centered on the central axis J. The stator core 20 is composed of a plurality of electromagnetic steel plates stacked in the axial direction. The stator core 20 has a cylindrical core back 21 centered on the central axis J and a plurality of teeth 22 extending radially inward from the core back 21.

[0038] The plurality of teeth 22 extend in the radial direction. The plurality of teeth 22 are arranged at equal intervals in the circumferential direction. An umbrella-shaped portion 22a is provided at the radially inner front end of the tooth 22. The umbrella-shaped portion 22a protrudes to both sides of the circumferential direction relative to the tooth 22. That is, the circumferential dimension of the umbrella-shaped portion 22a is larger than the circumferential dimension of the tooth 22. The surface of the umbrella-shaped portion 22a facing the radial inner side is radially opposed to the outer peripheral surface of the rotor 3 with a gap therebetween.

[0039] The winding portion 30 is mounted on the teeth 22. Slots S are provided between the teeth 22 adjacent to each other in the circumferential direction. That is, the stator core 20 is provided with a plurality of slots S arranged in the circumferential direction.

[0040] The conductors 50 of the winding 30 are housed in the slots S. As described later, the plurality of conductors 50 are connected to each other to form a conductor connection body 60. In addition, one insulating paper 6 is disposed in each slot S. The insulating paper 6 ensures insulation between the winding 30 and the stator core 20 in the slots S.

[0041] Six imaginary layers arranged in the radial direction are provided in one slot S. One conductor 50 is arranged in each layer in one slot S. Six conductors 50 are arranged in a row in the radial direction in the slot S. That is, a plurality of conductor connectors 60 are arranged in layers arranged in the radial direction in the slot S. Here, the layers in the slot S in which the conductor connectors 60 are arranged are respectively set as the first layer (outermost layer) L1, the second layer L2, the third layer L3, the fourth layer L4, the fifth layer L5, and the sixth layer (innermost layer) L6 from the radial outer side to the inner side. The first layer L1 is the layer located most radially outward among the layers. In addition, the sixth layer L6 is the layer located most radially inward among the layers. In the following description, the first layer L1 is sometimes referred to as the outermost layer. Similarly, the sixth layer L6 is sometimes referred to as the innermost layer. That is, in the present embodiment, among the layers in which the conductor coupling bodies 60 are arranged in the slot S, the layer closest to the outermost side in the radial direction is referred to as the outermost layer L1 , and the layer closest to the innermost side in the radial direction is referred to as the innermost layer L6 .

[0042] The slot S has an opening 29h that opens radially inward. The opening 29h is provided between the umbrella-shaped portions 22a located at the front ends of the adjacent teeth 22. The width dimension of the opening 29h along the circumferential direction is smaller than the dimension of the conductor 50 along the circumferential direction. Therefore, the conductor 50 is not easy to pass through the opening 29h, and it is possible to suppress the conductor 50 from being separated from the stator core 20.

[0043] In this embodiment, the stator core 20 has 48 teeth 22. That is, the stator 2 of this embodiment has 48 slots. The number of slots of the stator 2 is just an example and can be appropriately set according to the number of poles of the rotor magnet 3b and the winding method of the winding part 30.

[0044] Figure 3 1 is a schematic diagram showing a circuit constituted by the winding portion 30 and the bus bar unit 5 according to the present embodiment.

[0045] The winding portion 30 of the present embodiment has a plurality of (six in the present embodiment) conductor connectors 60. That is, the stator 2 has the conductor connectors 60. In addition, the conductor connectors 60 constitute segment coils. The six conductor connectors 60 include two U-phase conductor connectors 60U, two V-phase conductor connectors 60V, and two W-phase conductor connectors 60W.

[0046] The bus bar unit 5 includes three phase bus bars 11 , 12 , 13 and one neutral point bus bar 10 . The three phase bus bars 11 , 12 , 13 include a U-phase bus bar 11 , a V-phase bus bar 12 , and a W-phase bus bar 13 , which will be described in detail later.

[0047] The U-phase conductor connector 60U, the V-phase conductor connector 60V, and the W-phase conductor connector 60W are Y-connected through the neutral point bus bar 10 and the phase bus bars 11, 12, and 13. In the present embodiment, two Y-connections corresponding to the two conductor connectors 60 of each phase are formed, and each Y-connection is connected in parallel. That is, the winding part 30 is 2Y-connected through the bus bar unit 5.

[0048] Each conductor connector 60 has a first terminal portion 63 and a second terminal portion 64 as both ends. The first terminal portion 63 and the second terminal portion 64 are provided at one end and the other end of the conductor connector 60, respectively. The conductor connector 60 is mounted on the stator core 20 between the first terminal portion 63 and the second terminal portion 64 to form a coil of each phase. The conductor connector 60 is connected to the bus bar unit 5 (see Figure 1 )connect.

[0049] The second terminal portions 64 of the two U-phase conductor coupling bodies 60U, the two V-phase conductor coupling bodies 60V, and the two W-phase conductor coupling bodies 60W are connected to one neutral point bus bar 10. Thus, the second terminal portions 64 of the six conductor coupling bodies 60 have the same potential and constitute a neutral point.

[0050] The first terminal portions 63 of the two U-phase conductor coupling bodies 60U are connected to the U-phase bus bar 11. The first terminal portions 63 of the two V-phase conductor coupling bodies 60V are connected to the V-phase bus bar 12. The first terminal portions 63 of the two W-phase conductor coupling bodies 60W are connected to the W-phase bus bar 13. Alternating currents whose phases are shifted by 120° flow through the phase bus bars 11, 12, and 13. That is, alternating currents of different phases flow through the conductor coupling bodies 60 of the plurality of phases.

[0051] The stator 2 of the present embodiment has a conductor connection body 60 constituting a plurality of phases (U phase, V phase, W phase). In addition, the second terminal portions 64 of the conductor connection bodies 60 of the plurality of phases are electrically connected to each other to form a neutral point. According to the present embodiment, the conductor connection bodies 60 of the plurality of phases can be connected in a star connection, and the stator 2 that allows the rotor 3 to rotate smoothly can be configured. In addition, in the present embodiment, the case of configuring a three-phase circuit is described, but the number of phases is not limited to the present embodiment.

[0052] In the present embodiment, the number of conductor coupling bodies 60 constituting each phase is plural, and in each phase, the conductor coupling bodies 60 of the same phase are connected in parallel. This can increase the output of the motor 1.

[0053] In the present embodiment, two conductor connectors 60 are provided in each of the U phase, the V phase, and the W phase. In addition, the two conductor connectors 60 of the same phase are passed through the adjacent slots S and are mounted on the stator core 20. In the following description, the two conductor connectors 60 passed through the adjacent slots S are referred to as a connector pair 69. In addition, in the following description, when the two conductor connectors 60 forming the connector pair 69 are distinguished from each other, one is referred to as a first conductor connector 60A, and the other is referred to as a second conductor connector 60B.

[0054] In this embodiment, one connection body pair 69 is provided in each phase, but each phase may be provided with a plurality of connection body pairs 69. In this case, two conductor connection bodies 60 of the same phase constituting each connection body pair 69 also pass through the slots S adjacent to each other.

[0055] Figure 4 It is a perspective view of the stator 2 according to the present embodiment. Figure 5 1 is a schematic diagram showing a winding structure of two conductor connection bodies 60 forming a connection body pair 69 .

[0056] like Figure 5 As shown, the conductor connection body 60 is formed by connecting a plurality of conductors 50 in series. The conductor connection body 60 is wave-wound in each slot S between the plurality of teeth 22 along the circumferential direction of the stator core 20 .

[0057] Each conductor 50 is formed by bending a flat wire. By using a flat wire as the conductor 50, the space factor of the conductor 50 in the slot S can be increased compared to the case of using a round wire. In addition, in this specification, "flat wire" refers to a wire having a quadrilateral or substantially quadrilateral cross-sectional shape. In this specification, "substantially quadrilateral" includes a quadrilateral with rounded corners. Although not shown in the figure, in this embodiment, an enamel coating is provided on the surface of the conductor 50. The enamel coating of the conductor 50 is removed at the connecting portion of the electrical connection.

[0058] The plurality of conductors 50 constituting the conductor coupling body 60 are classified into the end conductor 51, the hairpin conductor 52, the first turn-back conductor 54, and the second turn-back conductor 55. That is, the plurality of conductors 50 include the end conductor 51, the hairpin conductor 52, the first turn-back conductor 54, and the second turn-back conductor 55.

[0059] Each conductor 50 has at least a straight portion 50a extending linearly in the axial direction (Z direction) and a connecting portion 50j connected to another conductor 50. The straight portion 50a extends in the axial direction inside the slot S. That is, the conductor connection body 60 is accommodated in the slot S at the straight portion 50a.

[0060] The connecting portion 50j is located at the end portion on the lower side (the other side in the axial direction) of each conductor 50. The connecting portion 50j extends downward from the slot S. The connecting portion 50j of one conductor 50 is connected to the connecting portion 50j of another conductor 50. The connecting portions 50j of a pair of conductors 50 are joined to each other by a joining means such as welding.

[0061] After the conductor 50 is attached to the stator core 20, the connection portion 50j is bent in the circumferential direction and joined to the connection portion 50j of another conductor 50. In the conductor 50 before being attached to the stator core 20, the connection portion 50j is in a straight line shape continuous with the straight line portion 50a.

[0062] In the assembly process of the conductor 50 to the stator core 20, the operator (or the assembly device, the same below) inserts the connecting portion 50j and the straight portion 50a into the slot S from the upper side (one side in the axial direction) of the stator core 20. Then, the operator bends the connecting portion 50j in the circumferential direction and joins it with other connecting portions 50j. The stator 2 of this embodiment can be assembled by inserting a plurality of conductors 50 into the slot S of the stator core 20 from the upper side and joining them at the lower side. Therefore, a complicated assembly process is not required and the assembly process can be simplified.

[0063] like Figure 4 As shown, the conductor connector 60 extends to the upper and lower sides of the stator core 20 in the area other than the straight portion 50a. The portions of the straight portion 50a extending to the upper and lower sides of the stator core 20 constitute the first coil end 30e and the second coil end 30f of the stator core 20, respectively.

[0064] The first coil end 30e located on the upper side (one side in the axial direction) with respect to the stator core 20 is mainly composed of the first terminal portion 63, the second terminal portion 64, the lap portion 50d, the first folded portion 50f, and the second folded portion 50g of the conductor connector 60. On the other hand, the second coil end 30f located on the lower side (the other side in the axial direction) with respect to the stator core 20 is mainly composed of the connecting portion 50j of the conductor connector 60. In addition, the lap portion 50d, the first folded portion 50f, and the second folded portion 50g will be described later.

[0065] Next, various conductors 50 will be described.

[0066] like Figure 5 As shown in FIG. 1 , the end conductor 51 includes a first terminal portion 63 or a second terminal portion 64 (hereinafter referred to as terminal portions 63, 64), a straight portion 50a, and a connecting portion 50j. The terminal portions 63, 64 are located at the upper end of the end conductor 51. The terminal portions 63, 64 extend the straight portion 50a and extend upward. In the end conductor 51, the connecting portion 50j extends from the lower end of the straight portion 50a in the circumferential direction.

[0067] Two end conductors 51 are provided in one conductor connection body 60. Therefore, one first terminal portion 63 and one second terminal portion 64 are provided in one conductor connection body 60. The first terminal portion 63 and the second terminal portion 64 constitute both ends of the conductor connection body 60. Any 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 terminal portion 63. The neutral point bus bar 10 is connected to the second terminal portion 64.

[0068] The hairpin conductor 52 has two straight portions 50a, two connecting portions 50j and one lap portion 50d. The lap portion 50d laps the two straight portions 50a. That is, in the hairpin conductor 52, the two straight portions 50a are connected to each other via the lap portion 50d. In the hairpin conductor 52, the two connecting portions 50j are connected to the lower ends of different straight portions 50a, respectively. A plurality of lap portions 50d protrude upward from the end surface on the upper side (one axial side) of the stator core 20.

[0069] In the hairpin conductor 52, the two straight portions 50a are arranged in accordance with the number of slots per pole s. Here, the number of slots per pole s refers to the number of slots S of the stator 2 arranged between one magnetic 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 magnetic poles of the rotor 3). In the present embodiment, the number of magnetic poles of the rotor 3 is 8, and the number of slots of the stator 2 is 48, so 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.

[0070] In the hairpin conductor 52, the two connecting portions 50j are bent in opposite directions in the circumferential direction. One of the two connecting portions 50j located on the circumferential one side θ1 extends from the lower end of the straight portion 50a to the circumferential one side θ1, and the other located on the circumferential other side θ2 extends from the lower end of the straight portion 50a to the circumferential other side θ2. Figure 5 Although part of the illustration is omitted, 22 hairpin conductors 52 are provided in the first conductor connecting body 60A and the second conductor connecting body 60B.

[0071] The first turning-back conductor 54 includes two straight portions 50a, two connecting portions 50j, and one first turning-back portion 50f. The second turning-back conductor 55 includes two straight portions 50a, two connecting portions 50j, and one second turning-back portion 50g.

[0072] The first folded portion 50f and the second folded portion 50g overlap the two straight portions 50a. That is, in the first folded conductor 54 and the second folded conductor 55, the two straight portions 50a are connected to each other via the first folded portion 50f or the second folded portion 50g.

[0073] In the first turning conductor 54, two connecting portions 50j are bent from the lower end of the straight portion 50a to the other circumferential side θ2. In the second turning conductor 55, two connecting portions 50j are bent from the lower end of the straight portion 50a to the one circumferential side θ1.

[0074] In the first folding conductor 54 and the second folding conductor 55, the two straight portions 50a are accommodated in the slots S spaced apart by the number of slots per pole s-1 (5 slots in this embodiment) in the circumferential direction. Therefore, the first folding portion 50f and the second folding portion 50g connect the straight portions 50a arranged in the slots S spaced apart by the number of slots per pole s-1. In addition, in one conductor connection body 60, the first terminal portion 63 and the second terminal portion 64 are led out from the slots S spaced apart by the number of slots per pole s-1 (5 slots in this embodiment) in the circumferential direction.

[0075] Next, the winding structures of the first conductor connection body 60A and the second conductor connection body 60B will be described.

[0076] The first conductor connector 60A is corrugated and wound according to the number of slots per pole s (6 slots in the present embodiment) from the first terminal portion 63 to the first folded portion 50f toward the circumferential one side θ1. Furthermore, the first conductor connector 60A is corrugated and wound according to the number of slots per pole s (6 slots in the present embodiment) from the first folded portion 50f to the second terminal portion 64 toward the circumferential other side θ2. Here, in the first conductor connector 60A, the region corrugated and wound along the circumferential direction between the first terminal portion 63 and the first folded portion 50f is referred to as the first corrugated winding portion 61A. In addition, in the first conductor connector 60A, the region corrugated and wound along the circumferential direction between the second terminal portion 64 and the first folded portion 50f is referred to as the second corrugated winding portion 62A. That is, the first conductor connection body 60A includes a first terminal portion 63, a second terminal portion 64, a first wave-wound portion 61A, a first folded portion 50f, and a second wave-wound portion 62A. The first wave-wound portion 61A is wave-wound from the first terminal portion 63 to one circumferential side θ1. The first folded portion 50f is connected to the end of the first wave-wound portion 61A on one circumferential side θ1. In addition, the first folded portion 50f is connected to the end of the second wave-wound portion 62A on one circumferential side θ1. That is, the first folded portion 50f connects the ends of the first wave-wound portion 61A and the second wave-wound portion 62A on one circumferential side θ1 to each other. The second wave-wound portion 62A is wave-wound from the first folded portion 50f to the second terminal portion 64 to the other circumferential side θ2. The first wave-shaped wound portion 61A and the second wave-shaped wound portion 62A pass through the grooves S adjacent to each other.

[0077] On the other hand, the second conductor connection body 60B is corrugated and wound according to the number of slots per pole s (6 slots in the present embodiment) from the first terminal portion 63 to the second folded portion 50g toward the other circumferential side θ2. Furthermore, the second conductor connection body 60B is corrugated and wound according to the number of slots per pole s (6 slots in the present embodiment) from the second folded portion 50g to the second terminal portion 64 toward the one circumferential side θ1. Here, in the second conductor connection body 60B, the region corrugated and wound along the circumferential direction between the first terminal portion 63 and the second folded portion 50g is referred to as the third corrugated winding portion 61B. In addition, in the second conductor connection body 60B, the region corrugated and wound along the circumferential direction between the second terminal portion 64 and the second folded portion 50g is referred to as the fourth corrugated winding portion 62B. That is, the second conductor connection body 60B includes a first terminal portion 63, a second terminal portion 64, a third wave-wound portion 61B, a second folded portion 50g, and a fourth wave-wound portion 62B. The third wave-wound portion 61B is wave-wound from the first terminal portion 63 to the other circumferential side θ2. The second folded portion 50g is connected to the end of the third wave-wound portion 61B on the other circumferential side θ2. In addition, the second folded portion 50g is connected to the end of the fourth wave-wound portion 62B on the other circumferential side θ2. That is, the second folded portion 50g connects the ends of the third wave-wound portion 61B and the fourth wave-wound portion 62B on the other circumferential side θ2. The fourth wave-wound portion 62B is wave-wound from the second folded portion 50g to the second terminal portion 64 to the one circumferential side θ1. The third wave-wound portion 61B and the fourth wave-wound portion 62B pass through the slots S adjacent to each other.

[0078] The first conductor connection body 60A of the present embodiment is wave-wound in the first wave-wound portion 61A and the second wave-wound portion 62A according to the number of slots per pole s. Similarly, the second conductor connection body 60B is wave-wound in the third wave-wound portion 61B and the fourth wave-wound portion 62B according to the number of slots per pole s. That is, the conductor connection body 60 is wound and mounted on the stator core 20 with full pitch. In addition, the first wave-wound portion 61A and the third wave-wound portion 61B pass through the same slot S, and the second wave-wound portion 62A and the fourth wave-wound portion 62B pass through the same slot S.

[0079] According to the conductor connection body 60 of the present embodiment, the winding direction of the wave winding is reversed in the circumferential direction at the folding portion (the first folding portion 50f or the second folding portion 50g). The folding portion (the first folding portion 50f or the second folding portion 50g) is a part of the folding conductor (the first folding conductor 54 or the second folding conductor 55), and is formed by bending the conductor 50. Therefore, compared with the case where a conductor is separately connected as the folding portion, the number of connection parts when the conductor connection body 60 is manufactured can be reduced, and the connection process can be simplified.

[0080] Figure 6 1 is a schematic diagram of the winding structure of two conductor connection bodies 60 (first conductor connection body 60A and second conductor connection body 60B) of phase U. Here, the winding structure of two conductor connection bodies 60 in one phase will be specifically described.

[0081] exist Figure 6 In the embodiment, the slot S from which the first terminal portions 63 of the first conductor connection body 60A and the second conductor connection body 60B are led out is set as the first slot S, and numbers are given from the slot S toward the other side θ2 in the circumferential direction to the 48th slot S. In the present embodiment, the second terminal portions 64 of the first conductor connection body 60A and the second conductor connection body 60B are led out from the 44th slot S.

[0082] In addition, Figure 6 In the figure, the portion (lap portion 50d, first folded portion 50f, and second folded portion 50g) of the conductor connector 60 that passes through the upper side (one axial side) of the stator core 20 is indicated by a solid line. In addition, the portion (connection portion 50j) of the conductor connector 60 that passes through the lower side (the other axial side) of the stator core 20 is indicated by a dotted line.

[0083] And, in Figure 6 In FIG. 1 , the first layer L1, the second layer L2, the third layer L3, the fourth layer L4, the fifth layer L5, and the sixth layer L6 in each slot S are arranged vertically and shown. Figure 6 In FIG. 1 , when the current flows from the first terminal portion 63 toward the second terminal portion 64, the direction of the current flowing in the conductor connection body 60 arranged in each layer of each slot S when viewed from the upper side is indicated by symbols. In addition, the current flowing in the conductor connection body 60 is an alternating current, so Figure 6 The direction of the current shown is regularly reversed.

[0084] The first terminal portion 63 and the second terminal portion 64 of the first conductor connection body 60A are both led out from the outermost layer L1 of the slot S. In addition, the first turn-back portion 50f of the first conductor connection body 60A is connected to the portion arranged in the innermost layer L6 of the slot S. The first conductor connection body 60A is circumferentially wave-wound three times in the first wave-wound portion 61A and the second wave-wound portion 62A. The first wave-wound portion 61A alternately passes through the outermost layer L1 and the second layer L2 in the first turn from the first terminal portion 63 toward the first turn-back portion 50f and turns around, alternately passes through the third layer L3 and the fourth layer L4 in the second turn and turns around, and alternately passes through the fifth layer L5 and the innermost layer L6 in the third turn and turns around. In addition, the second wavy winding portion 62A alternately passes through the fifth layer L5 and the innermost layer L6 and surrounds in the first week from the first folded portion 50f toward the second end portion 64, alternately passes through the third layer L3 and the fourth layer L4 and surrounds in the second week, and alternately passes through the outermost layer L1 and the second layer L2 and surrounds in the third week.

[0085] The second conductor connection body 60B has substantially the same structure as the first conductor connection body 60A, but mainly differs in the radial inner and outer structures. In addition, the slot S through which the second conductor connection body 60B passes is the same slot S as the slot S through which the first conductor connection body 60A passes.

[0086] The first terminal portion 63 and the second terminal portion 64 of the second conductor connection body 60B are both led out from the innermost layer L6 of the slot S. In addition, the second turn-back portion 50g of the second conductor connection body 60B is connected to the portion of the slot S arranged at the outermost layer L1. The second conductor connection body 60B is circumferentially wave-wound three times in the third wave-wound portion 61B and the fourth wave-wound portion 62B. The third wave-wound portion 61B alternately passes through the fifth layer L5 and the innermost layer L6 in the first turn from the first terminal portion 63 toward the second turn-back portion 50g and is wound around, alternately passes through the third layer L3 and the fourth layer L4 in the second turn and is wound around, and alternately passes through the outermost layer L1 and the second layer L2 in the third turn and is wound around. In addition, the fourth wavy winding portion 62B alternately passes through the outermost layer L1 and the second layer L2 and surrounds in the first week from the second folded portion 50g toward the second end portion 64, alternately passes through the third layer L3 and the fourth layer L4 and surrounds in the second week, and alternately passes through the fifth layer L5 and the innermost layer L6 and surrounds in the third week.

[0087] The first terminal portions 63 of the two conductor connectors 60 (the first conductor connector 60A and the second conductor connector 60B) of the U phase are both led out from the first slot S, and the second terminal portions 64 of the two conductor connectors 60 (the first conductor connector 60A and the second conductor connector 60B) are both led out from the 44th slot S.

[0088] The two conductor connectors 60 of the U phase pass only through the first, second, seventh, eighth, thirteenth, fourteenth, nineteenth, twentieth, twenty-fifth, twenty-sixth, thirty-first, thirty-second, thirty-seventh, thirty-eighth, forty-third, and forty-fourth slots S. That is, the two conductor connectors 60 of the U phase pass only through slots S that are shifted by an integral multiple of the number of slots per pole s (6 in this embodiment) from the first slot S and the second slot S. In addition, in the slots S where the conductor connectors 60 of the U phase are arranged, the conductor connectors 60 of the other phases (V phase and W phase) are not arranged.

[0089] Figure 7 It is a schematic diagram of the winding structure of the conductor connection body 60 of the U phase, the V phase, and the W phase.

[0090] exist Figure 7 In the figure, only the portion of the conductor coupling body 60 passing through the upper side (one axial side) of the stator core 20 is shown, and the portion passing through the lower side (the other axial side) of the stator core 20 is omitted (equivalent to Figure 6 dashed line).

[0091] like Figure 7 As shown, the first conductor connector 60A and the second conductor connector 60B of phases other than the U phase (V phase and W phase) are configured to be arranged in a manner that is sequentially shifted by four grooves in any direction along the circumferential direction relative to the first conductor connector 60A and the second conductor connector 60B of the U phase.

[0092] The two conductor connectors 60 of the V phase respectively pass through only slots S that are shifted by an integral multiple of the number of slots per pole S, starting from the fifth slot S and the sixth slot S. The first terminal portions 63 of the two conductor connectors 60 of the V phase are both led out from the fifth slot S, and the second terminal portions 64 of the two conductor connectors 60 of the V phase are both led out from the 48th slot S.

[0093] The two conductor connectors 60 of the W phase respectively pass through only the slots S that are shifted by an integral multiple of the number of slots per pole S, starting from the third slot S and the fourth slot S. The first terminal portions 63 of the two conductor connectors 60 of the W phase are both led out from the 46th slot S, and the second terminal portions 64 of the two conductor connectors 60 of the W phase are both led out from the third slot S.

[0094] Figure 8 FIG. 2 is a top view of the stator 2 of this embodiment. Figure 8 In FIG. 5 , the bus bar unit 5 is omitted.

[0095] The stator 2 of the present embodiment has a plurality of conductor connectors 60, and each conductor connector 60 has a first terminal portion 63 and a second terminal portion 64. Therefore, the stator 2 is provided with a plurality of terminal portions 63 and 64. Here, among the plurality of terminal portions (a plurality of first terminal portions 63 and a plurality of second terminal portions 64), the terminal portions drawn out from the outermost layer L1 of the slot S are referred to as outer terminal portions 63A and 64A, and the terminal portions drawn out from the innermost layer L6 of the slot S are referred to as inner terminal portions 63B and 64B. That is, the plurality of terminal portions 63 and 64 are classified into outer terminal portions 63A and 64A and inner terminal portions 63B and 64B.

[0096] The outer terminal portions 63A and 64A are located at the radially outer end portions of the first coil end portion 30e. On the other hand, the inner terminal portions 63B and 64B are located at the radially inner end portions of the first coil end portion 30e. Three of the six first terminal portions 63 of the winding portion 30 of the present embodiment are the outer terminal portions 63A, and the remaining three of the first terminal portions 63 are the inner terminal portions 63B. Similarly, three of the six second terminal portions 64 of the winding portion 30 of the present embodiment are the outer terminal portions 64A, and the remaining three of the second terminal portions 64 are the inner terminal portions 64B.

[0097] The three outer terminal portions 63A and the three inner terminal portions 63B constituting the six first terminal portions 63 are arranged to face each other in the radial direction. The outer terminal portions 63A and the inner terminal portions 63B facing each other in the radial direction are led out from the same slot S. The outer terminal portions 63A and the inner terminal portions 63B led out from the same slot S are in phase with each other.

[0098] Similarly, three outer terminal portions 64A and three inner terminal portions 64B constituting the six second terminal portions 64 are arranged to face each other in the radial direction. The outer terminal portions 64A and the inner terminal portions 64B facing each other in the radial direction are led out from the same slot S. The outer terminal portions 64A and the inner terminal portions 64B led out from the same slot S are in phase with each other.

[0099] The terminal parts of the conventional stator are concentratedly arranged radially outside (or inside) the coil end. In this case, the plurality of terminal parts are necessarily arranged to spread out in the circumferential direction, and the connection object (eg busbar unit) connected to the terminal parts is likely to be enlarged in the circumferential direction.

[0100] In contrast, according to the stator 2 of the present embodiment, the plurality of terminal portions are provided as outer terminal portions 63A, 64A and inner terminal portions 63B, 64B, and are respectively led out to the radially outer side and the inner side of the first coil end portion 30e. That is, at least one of the plurality of first terminal portions 63 and the plurality of second terminal portions 64 is led out to the upper side (one side in the axial direction) from the outermost layer L1 of the slot. In addition, at least one of the plurality of first terminal portions 63 and the plurality of second terminal portions 64 is led out to the upper side (one side in the axial direction) from the innermost layer L6 of the slot S. Therefore, the plurality of terminal portions (the first terminal portion 63 and the second terminal portion 64) provided in the stator 2 can be arranged on the radially inner side and the outer side of the first coil end portion 30e.

[0101] According to the present embodiment, the plurality of terminal portions 63, 64 include outer terminal portions 63A, 64A and inner terminal portions 63B, 64B, so it is easy to arrange the plurality of terminal portions 63, 64 close to each other in the circumferential direction. Therefore, the connection object (the bus bar unit 5 of the present embodiment) connected to the outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B can be miniaturized in the circumferential direction. In order to improve the conductivity, each bus bar 10, 11, 12, 13 of the bus bar unit 5 uses an expensive metal material, so by making the terminal portions 63, 64 close to each other, the bus bars 10, 11, 12, 13 are miniaturized, and the stator 2 can be manufactured inexpensively. In addition, by arranging the plurality of terminal portions 63, 64 close to each other in the circumferential direction, the connection parts of the terminal portions 63, 64 and the bus bars 10, 11, 12, 13 are close to each other, and it is easy to shorten the production cycle time required for the connection process. Furthermore, by miniaturizing the bus bar unit 5, it is easy to suppress the resonance of the bus bar unit 5 due to the vibration applied to the stator 2, and the support structure of the bus bar unit 5 can be simplified. In addition, according to the above structure, the area where the outer terminal portions 63A and 64A are provided and the area where the inner terminal portions 63B and 64B are provided can be arranged overlapping in the circumferential direction. As a result, it is possible to realize a structure in which the bus bar unit 5 is supported from the inside and outside in the radial direction by the plurality of terminal portions 63 and 64, and it is possible to suppress the bus bar unit 5 from vibrating.

[0102] In addition, such an effect is not limited to the present embodiment, and is an effect that can be obtained as long as the plurality of terminal portions 63, 64 include at least one outer terminal portion 63A, 64A and at least one inner terminal portion 63B, 64B. In the present embodiment, each conductor connector 60 has a folding portion 50f, 50g, but as long as it has the above-mentioned structure, the conductor connector may not have a folding portion. In this case, the first terminal portion and the second terminal portion of one conductor connector function as the inner terminal portion and the outer terminal portion, respectively. In addition, in the present embodiment, the first conductor connector 60A and the second conductor connector 60B are provided in each phase (U phase, V phase, W phase), but it may also be a structure in which a specific phase has only the first conductor connector 60A, and other specific phases have only the second conductor connector 60B.

[0103] In addition, the above effect can be obtained as long as at least one of all the end portions 63, 64 of the stator 2 is led out from the innermost layer and the innermost layer L6. In addition, in the case where all the end portions 63, 64 are led out from either the outermost layer L1 or the innermost layer L6 as shown in the present embodiment, the above effect can be obtained more significantly.

[0104] The plurality of terminal portions 63, 64 of this embodiment are classified into outer terminal portions 63A, 64A and inner terminal portions 63B, 64B. In addition, the outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B are opposed to each other in the radial direction. The outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B opposed to each other in the radial direction are led out from the same groove S.

[0105] According to the present embodiment, the outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B drawn out from the same slot S are arranged in a radial direction. Therefore, the connection parts of these terminal portions 63, 64 and the connection object (the bus bar unit 5 of the present embodiment) can be arranged in a radial direction, and the production cycle time required for the connection process can be easily shortened by bringing the connection parts close to each other. In addition, according to the present embodiment, the outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B drawn out from the same slot S are arranged radially inside and outside the bus bar unit 5. Therefore, a structure that stably supports the bus bar unit 5 from the radial inside and outside by a plurality of terminal portions 63, 64 can be realized.

[0106] In addition, such an effect can be obtained as long as at least one of the plurality of outer terminal portions 63A, 64A and at least one of the plurality of inner terminal portions 63B, 64B are drawn out from the same slot S. That is, any two of the plurality of first terminal portions 63 and the plurality of second terminal portions 64 can be drawn out from the outermost layer L1 and the innermost layer L6 of the same slot S, respectively. However, as shown in the present embodiment, if all the outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B are grouped and drawn out from the same slot S, the above-mentioned effect can be obtained more significantly.

[0107] In addition, in the present embodiment, the two terminal portions 63 and 64 drawn out from the same slot S are both the first terminal portion 63 or both the second terminal portion 64. However, one of the two terminal portions 63 and 64 drawn out from the same slot S may be the first terminal portion 63 and the other may be the second terminal portion 64. In this case, the two terminal portions 63 and 64 drawn out from the same slot S are connected to the phase bus bar and the neutral point bus bar, respectively.

[0108] The stator 2 of the present embodiment has a conductor connection body 60 constituting a plurality of phases (U phase, V phase, W phase), and the conductor connection bodies 60 of the same phase are arranged in the same slot S. That is, the conductor connection body 60 of the present embodiment is mounted on the stator core 20 by full-pitch winding. By adopting full-pitch winding as the winding structure of the conductor connection body 60, as shown in the present embodiment, it is possible to realize a structure in which all the terminal parts 63 and 64 are grouped with other terminal parts 63 and 64 and are led out from the same slot S. Therefore, the bus bar unit 5 can be supported from the inside and outside of the radial direction by all the terminal parts 63 and 64, and stable support of the bus bar unit 5 can be realized.

[0109] In addition, by adopting full pitch winding, only the conductor coupling bodies 60 of the same phase are arranged in the same slot S, and the insulation between the conductors 50 in the slot S can be ensured only by the enamel coating provided on the surface of the conductor 50. According to this embodiment, compared with the case where the conductor coupling bodies 60 of different phases are arranged in the same slot S, the insulation structure between the conductors 50 inside the slot S can be simplified.

[0110] The conductor coupling bodies 60 may be attached to the stator core 20 by short-pitch winding. In this case, it is preferable that the conductor coupling bodies 60 of different phases are insulated from each other inside the slot S by insulating paper or the like.

[0111] The plurality of conductor connectors 60 of the present embodiment include a plurality of first conductor connectors 60A and a plurality of second conductor connectors 60B. The first terminal portion 63 and the second terminal portion 64 of the first conductor connector 60A are both led out from the outermost layer L1 of the slot S as outer terminal portions 63A and 64A. In addition, the first folded portion 50f of the first conductor connector 60A is connected to the portion of the slot S arranged in the innermost layer L6. On the other hand, the first terminal portion 63 and the second terminal portion 64 of the second conductor connector 60B are both led out from the innermost layer L6 of the slot S as inner terminal portions 63B and 64B. In addition, the second folded portion 50g of the second conductor connector 60B is connected to the portion of the slot S arranged in the outermost layer L1.

[0112] Regarding the conductor connector 60, by providing the folded-back portions 50f and 50g, one conductor connector 60 can be increased, and the number of connection points between the conductor connector 60 and the busbar unit 5 can be reduced. However, the terminal portion of the conductor connector having the folded-back portion is only arranged on either the radially outer side or the radially inner side, so it is difficult to arrange the terminal portions radially inside and outside, respectively. According to the present embodiment, there are a first conductor connector 60A and a second conductor connector 60B, wherein the first conductor connector 60A has a pair of outer terminal portions 63A and 64A extending from the outermost layer L1, and the second conductor connector 60B has a pair of inner terminal portions 63B and 64B extending from the innermost layer L6. Thus, it is possible to provide the folded-back portions 50f and 50g on the conductor connector 60, and to realize a structure in which the terminal portions 63 and 64 are arranged radially inside and outside, respectively.

[0113] The stator 2 of the present embodiment includes the conductor coupling bodies 60U, 60V, 60W constituting a plurality of phases (U phase, V phase, W phase), and the first conductor coupling body 60A and the second conductor coupling body 60B are conductor coupling bodies 60 of the same phase.

[0114] Generally speaking, multiple conductor connections of the same phase with a folded portion are wound in the same direction and the terminal ends are arranged on either the radially outer side or the radially inner side. In addition, generally speaking, multiple conductor connections of the same phase pass through adjacent slots. Therefore, the conductor connection of the conventional structure needs to arrange the conductor connections of the same phase in a complicated manner at the folded portion, and the folded portion tends to become larger in the axial direction.

[0115] In contrast, according to the present embodiment, the folded-back portions 50f and 50g of the conductor connector 60 of the same phase are respectively arranged at the radially inner end and the radially outer end of the first coil end 30e. Therefore, the folded-back portions 50f and 50g of the same phase can be prevented from overlapping each other in the axial direction. As a result, the folded-back portions 50f and 50g can be prevented from protruding in the axial direction from the overlapped portion 50d, and the first coil end 30e can be miniaturized in the axial direction.

[0116] The first conductor connection body 60A of the present embodiment includes a first wave-wound portion 61A that is wave-wound from the first terminal portion 63 to the circumferential one side θ1 and a second wave-wound portion 62A that is wave-wound from the first turn portion 50f to the circumferential other side θ2. That is, the first wave-wound portion 61A and the second wave-wound portion 62A of the present embodiment both have a winding structure that is wound toward the circumferential one side θ1 as it goes from the radially outer side toward the inner side. Similarly, the second conductor connection body 60B includes a third wave-wound portion 61B that is wave-wound from the first terminal portion 63 to the circumferential other side θ2 and a fourth wave-wound portion 62B that is wave-wound from the second turn portion 50g to the circumferential one side θ1. That is, the third wave-wound portion 61B and the fourth wave-wound portion 62B of the present embodiment both have a winding structure that is wave-wound toward the circumferential one side θ1 as it goes from the radially outer end toward the inner end. According to the present embodiment, the first wave winding portion 61A, the second wave winding portion 62A, the third wave winding portion 61B, and the fourth wave winding portion 62B have the same winding structure, so the plurality of conductor coupling bodies 60 can be densely mounted on the stator core 20 .

[0117] like Figure 7 As shown, in the stator 2 of the present embodiment, the slots S from which the plurality of (six in the present embodiment) outer terminal portions 63A and 64A are led out are concentratedly arranged in the circumferential direction. Similarly, the slots S from which the plurality of inner terminal portions 63B and 64B are led out are concentratedly arranged in the circumferential direction. Thus, the stator 2 of the present embodiment makes the connection object (the bus bar unit 5 of the present embodiment) connected to the outer terminal portions 63A and 64A and the inner terminal portions 63B and 64B smaller in the circumferential direction. In particular, in the present embodiment, the outer terminal portions 63A and 64A and the inner terminal portions 63B and 64B are respectively opposite in the radial direction. Therefore, the circumferential region where the plurality of outer terminal portions 63A and 64A are concentratedly arranged overlaps with the circumferential region where the inner terminal portions 63B and 64B are concentratedly arranged in the circumferential direction. Therefore, the bus bar unit 5 can be further miniaturized in the circumferential direction.

[0118] Here, a structure for arranging the outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B in a concentrated manner in the circumferential direction is described. In the present embodiment, the number of the conductor connecting bodies 60 of the same phase is 2. Here, in order to generalize the number of the conductor connecting bodies 60 of the same phase, the number of the conductor connecting bodies 60 of the same phase is set to N using a natural number N.

[0119] In the case of a full-pitch winding structure in which the conductor connectors 60 of the same phase are arranged in the same slot S, N conductor connectors 60 of the same phase are arranged in adjacent slots S. Here, the slot S accommodating the U phase is called the U-phase slot SU, the slot S accommodating the W phase is called the W-phase slot SW, and the slot S accommodating the V phase is called the V-phase slot SV. All (48 in this embodiment) slots S are classified into the same number (16 in this embodiment) of U-phase slots SU, W-phase slots SW, and V-phase slots SV.

[0120] N U-phase slots SU, W-phase slots SW, and V-phase slots SV are arranged in a circumferential direction. In addition, N W-phase slots SW are arranged in a circumferential direction on the other side θ2 of the N U-phase slots SU. And N V-phase slots SV are arranged in a circumferential direction. Therefore, when each slot S is viewed toward the other side θ2 in the circumferential direction, N U-phase slots SU are arranged in a row, followed by N W-phase slots SW, and then N V-phase slots SV. In this way, in each slot, N slots S that accommodate the conductor connector 60 of each phase are arranged in a circumferential direction.

[0121] The U-phase terminal portions 63 and 64 are led out from the U-phase slot SU, the W-phase terminal portions 63 and 64 are led out from the W-phase slot SW, and the V-phase terminal portions 63 and 64 are led out from the V-phase slot SV. The plurality of outer terminal portions 63A and 64A are respectively classified into N U-phase terminal portions, N W-phase terminal portions, and N V-phase terminal portions. Furthermore, the outer terminal portions 63A and 64A of the same phase are classified into the first terminal portion 63 and the second terminal portion 64 in which current flows in opposite directions, and the outer terminal portions 63A and 64A of the same phase are not arranged in the adjacent slots S.

[0122] N W-phase slots SW and N V-phase slots SV are arranged between the slot S from the first terminal portion 63 for supplying the U phase and the slot S from the second terminal portion 64 for supplying the U phase. Similarly, N V-phase slots SV and N U-phase slots SU are arranged between the slot S from the first terminal portion 63 for supplying the W phase and the slot S from the second terminal portion 64 for supplying the W phase. N U-phase slots SU and N W-phase slots SW are arranged between the slot S from the first terminal portion 63 for supplying the V phase and the slot S from the second terminal portion 64 for supplying the V phase. That is, at least 2N slots S are arranged between the slot S from the first terminal portion 63 for supplying the same phase and the slot S from the second terminal portion 64.

[0123] like Figure 7As shown, in this embodiment, the outer terminal portion 63A arranged at the position closest to the one side θ1 in the circumferential direction is the U phase, and the outer terminal portion 63A arranged at the position closest to the other side θ2 in the circumferential direction is the V phase. If all the outer terminal portions 63A and 64A are arranged most densely in the circumferential direction, N W-phase slots SW, N V-phase slots SV, N U-phase slots SU, and N W-phase slots SW are arranged between the slots S from which the outer terminal portions 63A at both ends of the circumferential direction are led.

[0124] That is, according to the present embodiment, 4N (8 in the present embodiment) grooves are arranged between a pair of grooves S from which the outer terminal portions 63A, 64A separated the farthest in the circumferential direction are led out of the plurality of outer terminal portions 63A, 64A. When the plurality of outer terminal portions 63A, 64A are arranged in this way, all the outer terminal portions 63A, 64A can be arranged most densely in the circumferential direction. Similarly, according to the present embodiment, 4N (8 in the present embodiment) grooves are arranged between a pair of grooves S from which the inner terminal portions 63B, 64B separated the farthest in the circumferential direction are led out of the plurality of inner terminal portions 63B, 64B. When the plurality of inner terminal portions 63B, 64B are arranged in this way, all the inner terminal portions 63B, 64B can be arranged most densely in the circumferential direction.

[0125] According to this embodiment, the outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B can be concentratedly arranged in the circumferential direction. Thus, the connection objects (bus bar units 5 of this embodiment) to be connected to the outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B can be reduced in the circumferential direction.

[0126] <Bus bar unit>

[0127] like Figure 4 As shown, the bus bar unit 5 is located on the upper side (one side in the axial direction) of the stator core 20. The bus bar unit 5 of this embodiment is arranged directly above the first coil end 30e. The bus bar unit 5 is connected to a plurality of conductor connectors 60. The bus bar unit 5 is supported by a plurality of conductor connectors 60. In addition, the bus bar unit 5 is connected to an external terminal (not shown) not shown in the figure, so that current flows to the conductor connector 60, and the external terminal is connected to the inverter.

[0128] In addition, in this specification, "directly above" means that at least a part of the components are overlapped when viewed from the upper side and in the vertical direction. Similarly, "directly below" means that at least a part of the components are overlapped when viewed from the lower side and in the vertical direction.

[0129] like Figure 4As shown, a plurality of outer terminal portions 63A, 64A and a plurality of inner terminal portions 63B, 64B extend upward from the first coil end portion 30e. The upper ends of the outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B are located above the upper end portion of the first coil end portion 30e. In addition, when viewed from the axial direction, the outer terminal portions 63A, 64A are located at the radially outer ends of the first coil end portion 30e, and the inner terminal portions 63B, 64B are located at the radially inner ends of the first coil end portion 30e.

[0130] The bus bar unit 5 is radially opposed to the plurality of outer terminal portions 63A, 64A and the plurality of inner terminal portions 63B, 64B. The bus bar unit 5 is located radially inward of the outer terminal portions 63A, 64A. The bus bar unit 5 is located radially outward of the inner terminal portions 63B, 64B. The bus bar unit 5 is arranged so as to be sandwiched between the outer terminal portions 63A, 64A and the inner terminal portions 63B, 64B.

[0131] Fig. 9 and Fig.10 are all three-dimensional views of the bus bar unit 5. Fig.10 In FIG. 1 , the bus bar holder 90 is omitted. Fig.10 In the figure, for easy understanding, the neutral point is emphasized by adding a dot pattern to the bus bar 10.

[0132] The bus bar unit 5 includes a neutral point bus bar 10, a plurality of (three in this embodiment) phase bus bars 11, 12, 13, and a bus bar holder 90. The neutral point bus bar 10 is connected to the first terminal portion 63 of the conductor connector 60, and the phase bus bars 11, 12, 13 are connected to the second terminal portion 64 of the conductor connector 60 (see FIG. Figure 4 ).

[0133] like Fig.10 As shown, the neutral point bus bar 10 and the phase bus bars 11, 12, 13 are in a plate shape and are formed by press working. The neutral point bus bar 10 and the phase bus bars 11, 12, 13 extend in the circumferential direction.

[0134] The neutral point bus bar 10 is disposed below the phase bus bars 11, 12, and 13. The neutral point bus bar 10 includes a neutral point bus bar body 10a, a plurality of (six in this embodiment) neutral point connection portions 10b, and external connection terminals 10d.

[0135] When viewed from the up-down direction (axial direction), the neutral point bus bar body portion 10a extends in an arc shape centered on the central axis J. The neutral point bus bar body portion 10a has a plate thickness direction in the up-down direction.

[0136] The external connection terminal 10d of the neutral point bus bar 10 is formed by bending upward from the neutral point bus bar main body 10a and protruding upward. The external connection terminal 10d extends in the vertical direction. An external terminal (not shown) is connected to the external connection terminal 10d. In addition, since the neutral point bus bar 10 constitutes a neutral point, no voltage is applied to the external connection terminal 10d.

[0137] The neutral point connection portion 10b is formed by bending upward from the neutral point bus bar body 10a and protruding upward. The neutral point connection portion 10b extends in the vertical direction with a uniform width. The plurality of neutral point connection portions 10b have substantially the same shape.

[0138] The plurality of neutral point connection portions 10b are classified into outer connection portions 10ba located radially outwardly relative to the neutral point bus bar body portion 10a and inner connection portions 10bb located radially inwardly relative to the neutral point bus bar body portion 10a. The neutral point bus bar 10 of the present embodiment is provided with three outer connection portions 10ba and three inner connection portions 10bb.

[0139] The neutral point connection portion 10b is connected to the second terminal portion 64 of the conductor connection body 60 by welding or other joining means. That is, the neutral point bus bar 10 is connected to the second terminal portions 64 of the conductor connection bodies 60 of the plurality of phases at the neutral point connection portion 10b (see Figure 3 ) In addition, among the plurality of neutral point connection portions 10b, the outer connection portion 10ba is connected to the outer terminal portion 64A, and the inner connection portion 10bb is connected to the inner terminal portion 64B.

[0140] In the neutral point bus bar 10, three outer connecting parts 10ba and three inner connecting parts 10bb are respectively opposed in the radial direction. That is, the circumferential positions of the three outer connecting parts 10ba and the circumferential positions of the three inner connecting parts 10bb are consistent with each other. The neutral point bus bar 10 has three groups of one outer connecting part 10ba and one inner connecting part 10bb opposed in the radial direction. The outer connecting parts 10ba and the inner connecting parts 10bb opposed in the radial direction are connected to the outer terminal part 64A and the inner terminal part 64B drawn out from the same slot S.

[0141] According to the present embodiment, the second terminal portion 64 led out from the outermost layer L1 and the innermost layer L6 of the same slot S is connected to the neutral point bus bar 10. Therefore, the neutral point bus bar 10 can be supported in a manner clamped by the radially inner and outer second terminal portions 64. Thus, the neutral point bus bar 10 can be stably supported by the second terminal portion 64. As a result, even when vibration is applied to the stator 2, it is possible to suppress a large force from being applied to the connection portion between the neutral point bus bar 10 and the second terminal portion 64, and to suppress breakage and damage to the connection portion. Thus, the electrical connection between the neutral point bus bar 10 and the second terminal portion 64 can be maintained with a relatively low resistance, and the reliability of the connection can be improved.

[0142] In the present embodiment, the case where all the second terminal portions 64 are paired and connected to the neutral point bus bar 10 from the radial inside and outside is described. However, the same effect can be obtained as long as any two of the plurality of second terminal portions 64 are led out from the same slot S and connected to the neutral point bus bar 10 from the radial inside and outside.

[0143] The U-phase busbar 11 includes a phase busbar body 11a, a plurality of (two in the present embodiment) phase connection portions 11b, and an external connection terminal 11d. The V-phase busbar 12 includes a phase busbar body 12a, a plurality of (two in the present embodiment) phase connection portions 12b, a relay portion 12c, and an external connection terminal 12d. The W-phase busbar 13 includes a phase busbar body 13a, a plurality of (two in the present embodiment) phase connection portions 13b, a relay portion 13c, and an external connection terminal 13d.

[0144] The phase bus bar main body 11a, 12a, 13a of each phase extends along a plane perpendicular to the central axis J. The three phase bus bar main bodies 11a, 12a, 13a are arranged from one circumferential side θ1 toward the other circumferential side θ2 in the order of the phase bus bar main body 11a for U phase, the phase bus bar main body 13a for W phase, and the phase bus bar main body 12a for V phase. The phase bus bar main bodies 11a, 13a of the U phase and the W phase are arranged on the same plane with each other. The phase bus bar main bodies 11a, 13a of the U phase and the W phase are located on the upper side of the neutral point bus bar main body 10a. On the other hand, the phase bus bar main body 12a of the V phase is arranged on the same plane as the neutral point bus bar main body 10a.

[0145] The external connection terminal 11d of the U phase is formed by bending upward from the phase bus bar main body 11a and protruding upward. On the other hand, the external connection terminals 12d and 13d for the V phase and the W phase protrude upward from the relay parts 12c and 13c. The external connection terminals 11d, 12d, and 13d extend along the central axis J. External terminals (not shown) to which voltages of the U phase, the V phase, and the W phase are applied are connected to the external connection terminals 11d, 12d, and 13d, respectively.

[0146] The external connection terminals 11d, 12d, and 13d of each phase are located at the end of the circumferential side θ1 of each phase bus bar 11, 12, and 13. The three external connection terminals 11d, 12d, and 13d are arranged in the order of the external connection terminal 11d for the U phase, the external connection terminal 13d for the W phase, and the external connection terminal 12d for the V phase from the circumferential side θ1 to the circumferential side θ2. In addition, the external connection terminal 10d for the neutral point is located at a position closer to the circumferential side θ2 than the external connection terminal 12d for the V phase.

[0147] The external connection terminal 11d for the U phase is located directly above the neutral point bus bar body 10a. The external connection terminal 12d for the V phase is located directly above the neutral point bus bar body 10a and the phase bus bar body 13a for the W phase. The external connection terminal 13d for the W phase is located directly above the neutral point bus bar body 10a and the phase bus bar body 11a for the U phase.

[0148] The relay portion 12c for the V phase connects the phase bus bar main body 12a and the external connection terminal 12d. The relay portion 12c for the V phase extends from the phase bus bar main body 12a to one side in the circumferential direction. The relay portion 12c for the V phase is formed by bending upward relative to the phase bus bar main body 12a. The relay portion 12c for the V phase is located directly above the neutral point bus bar main body 10a and the phase bus bar main body 13a for the W phase. That is, the relay portion 12c for the V phase is configured to overlap with the neutral point bus bar main body 10a and the phase bus bar main body 13a for the W phase when viewed from the top and bottom directions.

[0149] The relay portion 13c for the W phase connects the phase bus bar body 13a and the external connection terminal 13d. The relay portion 13c for the W phase extends from the phase bus bar body 13a to one side in the circumferential direction. The relay portion 13c for the W phase is formed by bending upward relative to the phase bus bar body 13a. The relay portion 13c for the W phase is located directly above the neutral point bus bar body 10a and the phase bus bar body 11a for the U phase. That is, the relay portion 13c for the W phase is configured to overlap with the neutral point bus bar body 10a and the phase bus bar body 11a for the U phase when viewed from the top and bottom directions.

[0150] The phase connection parts 11b, 12b, 13b of each phase protrude upward from the respective phase bus bar main parts 11a, 12a, 13a. The phase connection parts 11b, 12b, 13b extend in the vertical direction with a uniform width. The plurality of phase connection parts 11b, 12b, 13b have substantially the same shape.

[0151] The phase busbars 11, 12, 13 of each phase (U phase, V phase, W phase) have two phase connection portions 11b, 12b, 13b, respectively. That is, each phase busbar 11, 12, 13 is connected to two first terminal portions 63. In addition, the phase busbars 11, 12, 13 may have only one phase connection portion 11b, 12b, 13b, respectively. That is, the phase busbars 11, 12, 13 only need to be connected to at least one first terminal portion 63.

[0152] The two phase connection portions 11b of each phase are classified into outer connection portions 11ba, 12ba, 13ba located radially outwardly relative to the phase bus bar body 11a and inner connection portions 11bb, 12bb, 13bb located radially inwardly relative to the phase bus bar body 11a.

[0153] The phase connection parts 11b, 12b, 13b of each phase are connected to the first terminal part 63 of the conductor coupling body 60 of each phase by a connection means such as welding. In addition, the outer connection parts 11ba, 12ba, 13ba of the phase connection parts 11b, 12b, 13b of each phase are connected to the outer terminal part 63A, and the inner connection parts 11bb, 12bb, 13bb are connected to the inner terminal part 63B.

[0154] The U-phase bus bar 11 has an outer connecting portion 11ba and an inner connecting portion 11bb. In the U-phase bus bar 11, the outer connecting portion 11ba and the inner connecting portion 11bb are respectively opposed in the radial direction. That is, the circumferential position of the outer connecting portion 11ba of the U phase and the circumferential position of the inner connecting portion 11bb of the U phase are consistent with each other. The outer connecting portion 11ba and the inner connecting portion 11bb opposed in the radial direction are connected to the outer terminal portion 63A and the inner terminal portion 63B drawn from the same slot S.

[0155] The V-phase bus bar 12 has an outer connecting portion 12ba and an inner connecting portion 12bb. In the V-phase bus bar 12, the outer connecting portion 12ba and the inner connecting portion 12bb are respectively opposed in the radial direction. That is, the circumferential position of the outer connecting portion 12ba of the V phase and the circumferential position of the inner connecting portion 12bb of the V phase are consistent with each other. The outer connecting portion 12ba and the inner connecting portion 12bb opposed in the radial direction are connected to the outer terminal portion 63A and the inner terminal portion 63B drawn out from the same slot S.

[0156] The W-phase busbar 13 has an outer connecting portion 13ba and an inner connecting portion 13bb. In the W-phase busbar 13, the outer connecting portion 13ba and the inner connecting portion 13bb are respectively opposed in the radial direction. That is, the circumferential position of the outer connecting portion 13ba of the W phase and the circumferential position of the inner connecting portion 13bb of the W phase are consistent with each other. The outer connecting portion 13ba and the inner connecting portion 13bb opposed in the radial direction are connected to the outer terminal portion 63A and the inner terminal portion 63B drawn from the same slot S.

[0157] According to the present embodiment, the first terminal portions 63 drawn from the outermost layer L1 and the innermost layer L6 of the same slot S are connected to the phase bus bars 11, 12, 13. As a result, the phase bus bars 11, 12, 13 can be supported by being clamped by the radially inner and outer first terminal portions 63, and the phase bus bars 11, 12, 13 can be stably supported by the first terminal portions 63. As a result, even when vibration is applied to the stator 2, it is possible to suppress a large force from being applied to the connection portion between the phase bus bars 11, 12, 13 and the first terminal portions 63, and to suppress breakage and damage to the connection portion. As a result, the electrical connection between the phase bus bars 11, 12, 13 and the first terminal portions 63 can be maintained at a low resistance, and the reliability of the connection can be improved.

[0158] In addition, according to the present embodiment, the first terminal portions 63 drawn from the outermost layer L1 and the innermost layer L6 of the same slot S are connected to one of the phase bus bars 11, 12, 13. Therefore, the first phase bus bars 11, 12, 13 can be extended radially on the upper side of the first coil end portion 30e and connected to these first terminal portions 63, and the phase bus bars 11, 12, 13 can be miniaturized and simplified in shape in the circumferential and axial directions.

[0159] In the present embodiment, the U-phase busbar 11, the V-phase busbar 12, and the W-phase busbar 13 are connected to the first terminal portion 63 drawn out from the same slot S. Thus, all the phase busbars 11, 12, and 13 are supported by the first terminal portion 63 from the inside and outside of the radial direction, respectively, and the entire busbar unit 5 can be supported more stably. In addition, as long as any one of the U-phase busbar 11, the V-phase busbar 12, and the W-phase busbar 13 is supported by the first terminal portion 63 drawn out from the same slot S, the busbar can be stably supported at least from the inside and outside of the radial direction by the first terminal portion 63.

[0160] In the present embodiment, the axial positions of all the phase connection parts 11b, 12b, 13b and the neutral point connection part 10b of all the phase bus bars 11, 12, 13 overlap with each other. The phase connection parts 11b, 12b, 13b and the neutral point connection part 10b are connected to the first terminal part 63 or the second terminal part 64 by welding or other joining means. According to the present embodiment, by making the axial positions of all the phase connection parts 11b, 12b, 13b and the neutral point connection part 10b coincide with each other, the axial coordinates of all the joining parts can be made the same. Thus, when joining by laser welding, the phase connection parts 11b, 12b, 13b and the neutral point connection part 10b can be joined without moving the focal position of the laser in the axial direction, and as a result, the joining process can be stably performed.

[0161] In the present embodiment, all the outer connecting parts 11ba, 12ba, 13ba of each phase and all the outer connecting parts 10ba for the neutral point are arranged on the same circumference centered on the central axis J. Similarly, all the inner connecting parts 11bb, 12bb, 13bb of each phase and all the inner connecting parts 10bb for the neutral point are arranged on the same circumference centered on the central axis J. Thus, in the joining process of the outer connecting parts 10ba, 11ba, 12ba, 13ba and the outer terminal parts 63A, 64A, the joining can be continuously performed while the jig for joining and the stator 2 are relatively rotated around the central axis J. Similarly, in the joining process of the inner connecting parts 10bb, 11bb, 12bb, 13bb and the inner terminal parts 63B, 64B, the joining can be continuously performed while the jig for joining and the stator 2 are relatively rotated around the central axis J. According to the present embodiment, the tact time of the joining process can be shortened, and as a result, the joining process can be simplified.

[0162] According to the present embodiment, the neutral point bus bar 10 overlaps with the plurality of phase bus bars 11, 12, 13 in the axial direction (vertical direction), and is located axially below the plurality of phase bus bars 11, 12, 13 (i.e., the stator core 20 side). The neutral point bus bar 10 is connected to all the second terminal portions 64 of the conductor connectors 60 of the U phase, V phase, and W phase. Therefore, the neutral point bus bar 10 is easier to be elongated in the circumferential direction than the phase bus bars 11, 12, 13. By arranging the neutral point bus bar 10 in an overlapping manner on the lower side of the other phase bus bars 11, the freedom of arrangement of the other phase bus bars 11, 12, 13 can be increased and the bus bar unit 5 can be miniaturized in the vertical direction.

[0163] The bus bar holder 90 is made of an insulating resin member and is formed by insert molding in which a portion of the neutral point bus bar 10 and the plurality of phase bus bars 11 , 12 , 13 are embedded. Thus, the bus bar holder 90 holds the neutral point bus bar 10 and the phase bus bars 11 , 12 , 13 .

[0164] The bus bar holder 90 embeds the neutral point bus bar body 10a of the neutral point bus bar 10 and the phase bus bar bodies 11a, 12a, 13a and the relay parts 12c, 13c of the phase bus bars 11, 12, 13. The bus bar holder 90 exposes the outer connecting parts 10ba, 11ba, 12ba, 13ba from the end face facing radially outward, and exposes the inner connecting parts 10bb, 11bb, 12bb, 13bb from the side face facing radially inward. Furthermore, the bus bar holder 90 exposes the external connecting terminals 10d, 11d, 12d, 13d of the neutral point bus bar 10 and the phase bus bars 11, 12, 13 from the upper end face.

[0165] The stator 2 of the present embodiment includes: a stator core which is annular and has a plurality of teeth extending in the radial direction; and a plurality of conductor connectors 60, each of which has a plurality of conductors 50 connected to each other. The conductor connector 60 is wave-wound in each slot S between the plurality of teeth 22 along the circumferential direction of the stator core 20. The plurality of conductor connectors 60 are arranged in layers arranged in the radial direction in the slot S. The radially outermost layer of each layer in which the conductor connector 60 is arranged in the slot S is set as the outermost layer L1, and the radially innermost layer is set as the innermost layer L6. Each conductor connector 60 has a first terminal portion 63 and a second terminal portion 64 as both ends. At least one of the plurality of first terminal portions 63 and the plurality of second terminal portions 64 is led out from the outermost layer L1 of the slot S to one side (upper side) in the axial direction. At least one of the plurality of first terminal portions 63 and the plurality of second terminal portions 64 is led out from the innermost layer L6 of the slot S to one side (upper side) in the axial direction. The plurality of conductor connections 60 include a plurality of first conductor connections 60A and a plurality of second conductor connections 60B. The first conductor connection 60A includes: a first wave-wound portion 61A that is wave-wound from the first terminal portion 63 to one circumferential side θ1; a first folded portion 50f connected to an end of the first wave-wound portion 61A on one circumferential side θ1; and a second wave-wound portion 62A that is wave-wound from the first folded portion 50f to the second terminal portion 64 to the other circumferential side θ2. The second conductor connection body 60B includes: a third wave-wound portion 61B that is wave-wound from the first terminal portion 63 to the other circumferential side θ2; a second turn-back portion 50g that is connected to the end of the third wave-wound portion 61B on the other circumferential side θ2; and a fourth wave-wound portion 62B that is wave-wound from the second turn-back portion 50g to the second terminal portion 64 to the one circumferential side θ1. The first terminal portion 63 and the second terminal portion 64 of the first conductor connection body 60A are both led out from the outermost layer L1 of the slot S, and the first turn-back portion 50f is connected to the portion of the slot S arranged in the innermost layer L6. The first terminal portion 63 and the second terminal portion 64 of the second conductor connection body 60B are both led out from the innermost layer L6 of the slot S, and the second turn-back portion 50g is connected to the portion of the slot S arranged in the outermost layer L1. In addition, the stator 2 of the present embodiment has a bus bar unit 5 located on one axial side of the stator core 20. The stator 2 has a conductor connection body 60 constituting a plurality of phases. The bus bar unit 5 has: a neutral point bus bar 10 connected to the second terminal portion 64 of the conductor connection body 60 of the plurality of phases; a plurality of phase bus bars 11, 12, 13 connected to at least one first terminal portion 63; and a bus bar holder 90 that holds the neutral point bus bar 10 and the phase bus bars 11, 12, 13.

[0166] According to the present embodiment, by leading the first terminal portion 63 and the second terminal portion 64 from the outermost layer L1 and the innermost layer L6, it is easy to miniaturize the bus bar unit 5 connected to the first terminal portion 63 and the second terminal portion 64 in the circumferential direction, compared with the case where the bus bar unit 5 is led out from only one of the outermost layer L1 and the innermost layer L6. In addition, when the bus bar unit 5 is arranged between the terminal portions 63, 64 led out from the innermost layer L6 and the terminal portions 63, 64 led out from the outermost layer L1, the bus bar unit 5 can be clamped and supported by the terminal portions 63, 64, and the support of the bus bar unit 5 by the terminal portions 63, 64 can be stabilized.

[0167] Various embodiments of the present invention have been described above, but each structure in each embodiment and their combination are examples, and the structure can be added, omitted, replaced, and other changes can be made without departing from the scope of the present invention. In addition, the present invention is not limited to the embodiment. For example, in the above embodiment, the case where the motor 1 is a three-phase motor is described, but it can also be another motor such as a five-phase motor.

[0168] In addition, the present technology can adopt the following structures.

[0169] (1) A stator, comprising: a stator core, which is annular and has a plurality of teeth extending in a radial direction; and a plurality of conductor connectors, each of which has a plurality of conductors connected to each other, wherein the conductor connectors are wave-wound in each slot between the plurality of teeth along the circumferential direction of the stator core, and the plurality of conductor connectors are arranged in layers arranged in the radial direction in the slots, wherein the layer closest to the radial outside of each layer in which the conductor connectors are arranged in the slots is set as the outermost layer, and the layer closest to the radial inside is set as the innermost layer, and each of the conductor connectors has a first terminal portion and a second terminal portion as two end portions, and at least one of the plurality of first terminal portions and the plurality of second terminal portions is led out from the outermost layer of the slot to one side in the axial direction, and at least one of the plurality of first terminal portions and the plurality of second terminal portions is led out from the innermost layer of the slot to one side in the axial direction.

[0170] (2) The stator according to (1), wherein any two of the plurality of first terminal portions and the plurality of second terminal portions are led out from the outermost layer and the innermost layer of the same slot, respectively.

[0171] (3) The stator according to (2), wherein the stator includes the conductor connection bodies constituting a plurality of phases, and the conductor connection bodies of the same phase are arranged in the same slot.

[0172] (4) A stator according to any one of (1) to (3), wherein the plurality of conductor connectors include a plurality of first conductor connectors and a plurality of second conductor connectors, the first conductor connector having: a first wave-wound portion that is wave-wound from the first terminal portion to one circumferential side; a first folded portion that is connected to an end portion of the first wave-wound portion on one circumferential side; and a second wave-wound portion that is wave-wound from the first folded portion to the second terminal portion to the other circumferential side, and the second conductor connector having: a third wave-wound portion that is wave-wound from the first terminal portion to the other circumferential side. The present invention relates to a wave-wound conductor assembly comprising: a first wave-wound conductor assembly comprising: a first wave-wound conductor assembly having a first wave-wound conductor and a second wave-wound conductor assembly having a first wave-wound conductor assembly ...

[0173] (5) The stator according to (4), wherein the stator includes the conductor connection bodies constituting a plurality of phases, and the first conductor connection body and the second conductor connection body are the conductor connection bodies of the same phase as each other.

[0174] (6) The stator according to any one of (1) to (5), wherein the stator has the conductor connection bodies constituting a plurality of phases, and the second terminal portions of the conductor connection bodies of the plurality of phases are electrically connected to each other to constitute a neutral point.

[0175] (7) A stator according to (6), wherein a plurality of conductor connectors constitute a three-phase circuit, the conductor connectors of the same phase are arranged in the same slot, the terminal portions led out from the outermost layer of the slot among the plurality of the first terminal portions and the plurality of the second terminal portions are set as outer terminal portions, and the terminal portions led out from the innermost layer of the slot are set as inner terminal portions, 4N slots are arranged between a pair of slots led out from the outer terminal portions that are farthest apart in the circumferential direction among the plurality of the outer terminal portions, and 4N slots are arranged between a pair of slots led out from the inner terminal portions that are farthest apart in the circumferential direction among the plurality of the inner terminal portions.

[0176] (8) A stator according to any one of (1) to (7), wherein the stator has a busbar unit located on one axial side of the stator core, the stator has the conductor connector constituting a plurality of phases, the busbar unit having: a neutral point busbar connected to the second end portion of the conductor connector of the plurality of phases; a plurality of phase busbars connected to at least one of the first end portions; and a busbar holder that holds the neutral point busbar and the phase busbars.

[0177] (9) The stator according to (8), wherein the second terminal portions respectively led out from the outermost layer and the innermost layer of the same slot are connected to the neutral point bus bar.

[0178] (10) A stator according to (8) or (9), wherein the number of the conductor connectors constituting each phase is plural, and the first terminal portions respectively extending from the outermost layer and the innermost layer of the same slot are connected to the phase busbar.

[0179] (11) A stator according to any one of (8) to (10), wherein the neutral point bus bar overlaps with the plurality of phase bus bars in the axial direction, and the neutral point bus bar is axially located closer to the stator core than the plurality of phase bus bars.

[0180] (12) A motor comprising: the stator according to any one of (1) to (11); and a rotor arranged radially inside the stator.

[0181] Description of symbols

[0182] 1: Motor; 2: Stator; 3: Rotor; 5: Bus bar unit; 10: Neutral point bus bar; 11: U-phase bus bar (phase bus bar); 12: V-phase bus bar (phase bus bar); 13: W-phase bus bar (phase bus bar); 20: Stator core; 22: Tooth; 50: Conductor; 50f: First folded portion; 50g: Second folded portion; 60: Conductor connector; 60A: First conductor connector; 60B: Second conductor connector Body connector; 61A: 1st corrugated winding portion; 62A: 2nd corrugated winding portion; 61B: 3rd corrugated winding portion; 62B: 4th corrugated winding portion; 63: 1st terminal portion; 64: 2nd terminal portion; 63A, 64A: outer terminal portion; 63B, 64B: inner terminal portion; 90: busbar retainer; L1: 1st layer (outermost layer); L6: 6th layer (innermost layer); S: groove; θ1: one circumferential side; θ2: the other circumferential side.

Claims

1. A stator, comprising: a stator core in an annular shape and having a plurality of teeth extending in a radial direction; and a plurality of conductor connecting bodies, each of the plurality of conductor connecting bodies having a plurality of conductors connected to each other, The conductor connection body is wave-wound in each slot between the plurality of teeth along the circumferential direction of the stator core. The plurality of conductor connecting bodies are arranged in layers along the radial direction in the slot. The layer closest to the radial direction outside of the layers in which the conductor connection body is arranged in the slot is defined as the outermost layer, and the layer closest to the radial direction inside is defined as the innermost layer. Each of the conductor connections has a first terminal portion and a second terminal portion as both ends. At least one of the plurality of first terminal portions and the plurality of second terminal portions is led out from the outermost layer of the groove to one side in the axial direction, At least one of the plurality of first terminal portions and the plurality of second terminal portions is led out from the innermost layer of the groove to one side in the axial direction.

2. The stator according to claim 1, wherein: Any two of the plurality of first terminal portions and the plurality of second terminal portions are led out from the outermost layer and the innermost layer of the same groove, respectively.

3. The stator according to claim 2, wherein: The stator includes the conductor connection body constituting a plurality of phases. The conductor connection bodies of the same phase are arranged in the same slot.

4. The stator according to claim 1, wherein: The plurality of conductor connecting bodies include a plurality of first conductor connecting bodies and a plurality of second conductor connecting bodies. The first conductor connection body has: a first corrugated winding portion, which is corrugated and wound from the first terminal portion toward one side in the circumferential direction; a first folded portion connected to one end portion of the first corrugated winding portion in the circumferential direction; and a second wave-wound portion that is wave-wound from the first folded portion to the second terminal portion toward the other side in the circumferential direction, The second conductor connection body has: a third corrugated winding portion, which is corrugated and wound from the first terminal portion toward the other side in the circumferential direction; a second folded portion connected to the other circumferential end of the third corrugated winding portion; and a fourth corrugated winding portion, which is corrugated toward one side in the circumferential direction from the second folded portion to the second terminal portion, The first terminal portion and the second terminal portion of the first conductor connection body are both led out from the outermost layer of the slot, and the first folded portion is connected to a portion of the slot disposed in the innermost layer. The first terminal portion and the second terminal portion of the second conductor coupling body are both led out from the innermost layer of the slot, and the second folded portion is connected to a portion of the slot arranged at the outermost layer.

5. The stator according to claim 4, wherein: The stator includes the conductor connection body constituting a plurality of phases. The first conductor connection body and the second conductor connection body are the conductor connection bodies that are in phase with each other.

6. The stator according to claim 1, wherein: The stator includes the conductor connection body constituting a plurality of phases. The second terminal portions of the conductor coupling bodies of a plurality of phases are electrically connected to each other to form a neutral point.

7. The stator according to claim 6, wherein: A plurality of conductor connections form a three-phase circuit. The conductor connections of the same phase are arranged in the same slot. Among the plurality of first terminal portions and the plurality of second terminal portions, the terminal portion led out from the outermost layer of the groove is defined as an outer terminal portion, and the terminal portion led out from the innermost layer of the groove is defined as an inner terminal portion, 4N grooves are arranged between a pair of grooves extending from the outer terminal portions which are most separated in the circumferential direction among the plurality of outer terminal portions, 4N of the grooves are arranged between a pair of the grooves extending from the inner terminal portions that are most separated in the circumferential direction among the plurality of inner terminal portions.

8. The stator according to any one of claims 1 to 7, wherein: The stator has a bus bar unit located on one axial side of the stator core. The stator includes the conductor connection body constituting a plurality of phases. The busbar unit has: a neutral point bus bar connected to the second terminal portions of the conductor connection bodies of the plurality of phases; a plurality of phase bus bars connected to at least one of the first terminal portions; and A bus bar holder holds the neutral point bus bar and the phase bus bars.

9. The stator according to claim 8, wherein: The second terminal portions respectively led out from the outermost layer and the innermost layer of the same slot are connected to the neutral point bus bar.

10. The stator according to claim 8, wherein: The number of the conductor connection bodies constituting each phase is plural, The first terminal portions respectively led out from the outermost layer and the innermost layer of the same slot are connected to the phase bus bar.

11. The stator according to claim 8, wherein: The neutral point bus bar overlaps with the plurality of phase bus bars in the axial direction, and the neutral point bus bar is located closer to the stator core than the plurality of phase bus bars in the axial direction.

12. A motor comprising: The stator according to claim 8; and The rotor is arranged radially inside the stator.

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