Motor

Abstract

To provide a motor that can be miniaturized.SOLUTION: One aspect of a motor of the present invention includes: a rotor that is rotatable about a center axis line J; a stator 2 disposed on a radial outside of the rotor; and first bus bars 70, 80, 90 and a second bus bar 10 that are disposed on one side in an axial direction of the stator. The stator includes a winding portion 30 including a plurality of conductor connection bodies in which a plurality of conductors are connected in series and a stator core in which a plurality of slots through which the conductor connection body passes are provided. The winding portion includes a coil end located on one side in the axial direction of the stator core. The conductor connection body includes a first end 63 and a second end 64 that are located at an outermost circumference in the radial direction of the coil end. The first bus bar is connected to the first end. The second bus bar is connected to the second end. The first bus bar is located on one side in the axial direction of the coil end. The second bus bar is located on the radial outside of the coil end.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a motor. [Background technology]

[0002] To improve the efficiency of motors, winding structures using multiple segment coils have been studied. Such motors are connected to bus bars that supply current to a stator connected to the segment coils. Patent Document 1 discloses a bus bar module that is disposed radially outside the coil end. The connection parts of this bus bar module are concentrated radially outside the coil end, simplifying the connection process. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-25745 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, there has been a demand for higher voltage motors, and wider bus bars are sometimes used to accommodate the increased current. In a conventional structure, the use of wider bus bars increases the radial size of the bus bar module, which may cause the bus bar module to protrude outside the core back, resulting in an increased motor size.

[0005] In view of the above circumstances, an object of the present invention is to provide a motor that can be made compact. [Means for solving the problem]

[0006] One embodiment of a motor of the present invention includes a rotor rotatable about a central axis, a stator disposed radially outward of the rotor, and a first bus bar and a second bus bar disposed on one axial side of the stator. The stator includes a winding section having a plurality of conductor connections in which a plurality of conductors are connected in series, and a stator core having a plurality of slots through which the conductor connections pass. The winding section has a coil end located on one axial side of the stator core. The conductor connections have a first end portion and a second end portion located on the radial outermost circumference of the coil end. The first bus bar is connected to the first end portion. The second bus bar is connected to the second end portion. The first bus bar is located on one axial side of the coil end. The second bus bar is located radially outward of the coil end. Effect of the Invention

[0007] According to one aspect of the present invention, a motor capable of achieving miniaturization can be provided. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic cross-sectional view of a motor according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view of the motor taken along line II-II in FIG. [Diagram 3] FIG. 3 is a schematic diagram showing a circuit formed by a winding portion and a bus bar module according to one embodiment. [Figure 4] FIG. 4 is a schematic diagram showing a winding configuration of a conductor connection body according to one embodiment. [Diagram 5] FIG. 5 is a perspective view of a stator, a phase busbar module, and a neutral busbar module according to one embodiment. [Figure 6] FIG. 6 is a plan view of a stator, a phase busbar module, and a neutral busbar module according to an embodiment. [Figure 7] FIG. 7 is a perspective view of a phase bus bar module according to one embodiment. [Figure 8]FIG. 8 is a perspective view of a neutral bus bar module according to one embodiment. [Figure 9] FIG. 9 is an enlarged view of region IX in FIG. [Figure 10] FIG. 10 is a schematic partial cross-sectional view of a motor according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0010] Note that the terms "up-down direction," "upper side," and "lower side" are merely names for describing the positional relationship of each part, and the actual positional relationship may be a positional relationship other than the positional relationship indicated by these names. Furthermore, even if the directions described as one axial side and the other axial side are interchanged, the effects of the embodiment can be reproduced. Similarly, even if the directions described as one circumferential side θ1 and the other circumferential side θ2 are interchanged, the effects of the embodiment can be reproduced.

[0011] <Motor> FIG. 1 is a schematic cross-sectional view of a motor 1 according to the present embodiment. The motor 1 of this embodiment is an inner rotor type motor. The motor 1 of this embodiment is a three-phase AC motor. The center of the motor 1 is a central axis J.

[0012] As shown in FIG. 1, the motor 1 includes a rotor 3, a stator 2, a phase busbar module (first busbar module) 5A, a neutral point busbar module (second busbar module) 5B, a bearing holder 4, and a housing 1a that accommodates these.

[0013] <Rotor> The rotor 3 is rotatable about a central axis J. The rotor 3 is disposed radially inside the annular stator 2. That is, the rotor 3 faces the stator 2 in the radial direction. The rotor 3 has a shaft 3a, a rotor magnet 3b, and a rotor core 3c.

[0014] The shaft 3a extends in the axial direction along the central axis J. The shaft 3a is, for example, cylindrical and extends in the axial direction centered on the central axis J. The shaft 3a is supported by two bearings 3p so as to be rotatable around the central axis J.

[0015] FIG. 2 is a cross-sectional view of the motor 1 taken along line II-II in FIG. The rotor core 3c is formed by laminating electromagnetic steel sheets. The rotor core 3c is cylindrical and extends in the axial direction. The inner peripheral surface of the rotor core 3c is fixed to the outer peripheral surface of the shaft 3a. The rotor core 3c is provided with a retaining hole 3h into which the rotor magnet 3b is inserted and fixed.

[0016] The rotor magnet 3b faces the stator 2 in the radial direction. The rotor magnet 3b is held in an embedded state in the rotor core 3c. The rotor magnet 3b in this embodiment has eight poles. The number of poles of the rotor 3 is not limited to this embodiment. The rotor magnet 3b may be a magnet of another form, such as a circular ring magnet.

[0017] <Stator> The stator 2 faces the rotor 3 in the radial direction with a gap therebetween. In this embodiment, the stator 2 is disposed radially outside the rotor 3. The stator 2 includes a stator core 20, a winding portion 30, and a plurality of insulating papers 6.

[0018] The stator core 20 is annular about a central axis J. The stator core 20 is made of a plurality of electromagnetic steel plates laminated along the axial direction. The stator core 20 has a cylindrical core back portion 21 centered on the central axis J, and a plurality of teeth portions 22 extending radially inward from the core back portion 21.

[0019] The multiple teeth portions 22 are arranged at equal intervals in the circumferential direction. An umbrella portion 22a is provided at the radially inner tip of each tooth portion 22. The umbrella portion 22a protrudes on both circumferential sides of the teeth portion 22. In other words, the circumferential dimension of the umbrella portion 22a is greater than the circumferential dimension of the teeth portion 22. The surface of the umbrella portion 22a facing radially inward faces the outer circumferential surface of the rotor 3 with a radial gap therebetween.

[0020] A winding portion 30 is attached to the teeth portion 22. A slot S is provided between the teeth portions 22 adjacent to each other in the circumferential direction. That is, the stator core 20 is provided with a plurality of slots S aligned in the circumferential direction.

[0021] Conductor 50 of winding portion 30 is housed in slot S. Furthermore, insulating paper 6 is disposed in each slot S. Insulating paper 6 ensures insulation between winding portion 30 and stator core 20 in slot S.

[0022] Eight layers aligned in the radial direction are provided in one slot S. In one slot, one conductor 50 is disposed in each layer. In the slot S, the eight conductors 50 are aligned in a row along the radial direction.

[0023] The slot S has an opening 29h that opens radially inward. The opening 29h is located between the umbrella portions 22a that are located at the tips of the adjacent teeth portions 22. The width dimension of the opening 29h in the circumferential direction is smaller than the dimension of the conductor 50 in the circumferential direction. Therefore, the conductor 50 has difficulty passing through the opening 29h, and detachment of the conductor 50 from the stator core 20 is suppressed.

[0024] In this embodiment, the stator core 20 has 48 teeth 22. That is, the stator 2 in this embodiment has 48 slots. The number of slots in the stator 2 is appropriately set depending on the number of poles of the rotor magnet 3b and the winding method of the winding portion 30.

[0025] FIG. 3 is a schematic diagram showing a circuit formed by the winding portion 30, the phase busbar module 5A, and the neutral point busbar module 5B of this embodiment. The winding section 30 of the present embodiment has a plurality (12 in the present embodiment) of conductor connections 60 to form a segment coil. The 12 conductor connections 60 are classified into four U-phase conductor connections 60U, four V-phase conductor connections 60V, and four W-phase conductor connections 60W.

[0026] As will be described in detail later, the phase busbar module 5A has three phase busbars (first busbars) 70, 80, 90, and the neutral busbar module 5B has one neutral busbar (second busbar) 10. The three phase busbars 70, 80, 90 are classified into a U-phase busbar 70, a V-phase busbar 80, and a W-phase busbar 90.

[0027] The U-phase conductor connection body 60U, the V-phase conductor connection body 60V, and the W-phase conductor connection body 60W are Y-connected by the neutral busbar 10 and the phase busbars 70, 80, and 90. In this embodiment, four Y connections corresponding to the four conductor connections 60 of each phase are configured, and the Y connections are connected in parallel. That is, the winding section 30 is 4Y-connected by the phase busbar module 5A and the neutral busbar module 5B.

[0028] In this embodiment, the winding section 30 has four conductor connections 60 of the same phase. However, if the winding section 30 has at least two conductor connections 60 that form a connection pair 69 passing through circumferentially adjacent slots S, a winding configuration similar to that of this embodiment can be achieved. Therefore, the multiple conductor connections 60 only need to be Y-connected in a 2×M arrangement, where M is a natural number (in this embodiment, M=2).

[0029] The conductor connection body 60 has a first end portion 63 and a second end portion 64. The first end portion 63 and the second end portion 64 are provided at one end and the other end of the conductor connection body 60, respectively. The conductor connection body 60 is attached to the stator core 20 between the first end portion 63 and the second end portion 64 to form coils for each phase. The conductor connection body 60 is connected at the first end portion 63 and the second end portion 64 to the phase busbar module 5A and the neutral busbar module 5B.

[0030] The second end portions 64 of the four U-phase conductor connections 60U, the four V-phase conductor connections 60V, and the four W-phase conductor connections 60W are connected to one neutral point busbar 10. As a result, the second end portions 64 of the twelve conductor connections 60 have the same potential and constitute a neutral point. In other words, the neutral point busbar 10 constitutes the neutral point of the three-phase circuit.

[0031] The first end portions 63 of the four U-phase conductor connected bodies 60U are connected to a U-phase bus bar 70. The first end portions 63 of the four V-phase conductor connected bodies 60V are connected to a V-phase bus bar 80. The first end portions 63 of the four W-phase conductor connected bodies 60W are connected to a W-phase bus bar 90. AC currents that are shifted in phase by 120° are passed through the phase bus bars 70, 80, 90, respectively.

[0032] Of the four conductor connections 60 of the same phase, two conductor connections 60 pass through adjacent slots S and are attached to the stator core 20. In this specification, the two conductor connections 60 passing through adjacent slots S are referred to as a connection pair 69. In the following description, when the two conductor connections 60 constituting the connection pair 69 are to be distinguished from each other, one is referred to as a first conductor connection 60A and the other is referred to as a second conductor connection 60B.

[0033] FIG. 4 is a schematic diagram showing the winding configuration of two conductor connecting bodies 60 forming a connecting body pair 69. As shown in FIG. As shown in FIG. 4, the conductor connector 60 is configured by connecting a plurality of conductors 50 in series. Each conductor 50 is configured by bending a rectangular wire. Therefore, the space factor of the conductor 50 in the slot S can be improved compared to the case where a round wire is used. In this specification, the term "rectangular wire" refers to a wire having a rectangular or substantially rectangular cross-sectional shape. In this specification, the term "substantially rectangular shape" includes a rectangular shape with rounded corners. Although not shown in the drawings, in this embodiment, the conductor 50 has an enamel coating on the surface.

[0034] The multiple conductors 50 constituting the conductor connection body 60 are classified into a terminal conductor 51, a hairpin conductor 52, a first turn-back conductor 54, and a second turn-back conductor 55.

[0035] Each of the conductors 50 has at least straight portions 50a, 50b, and 50c that extend linearly along the axial direction (Z direction) and a connecting portion 50j located at the end on the lower side (the other axial side). The straight portions 50a, 50b, and 50c pass through the slots S. That is, the conductor connecting body 60 is accommodated in the slots S at the straight portions 50a, 50b, and 50c. The conductor connecting body 60 extends to the upper and lower sides of the stator core 20 in areas other than the straight portions 50a, 50b, and 50c. The portions extending from the upper and lower sides of the stator core 20 form the coil ends 30e (see FIG. 1) of the stator core 20.

[0036] The straight portion 50a is classified into a first straight portion 50a, a second straight portion 50b, and a third straight portion 50c. The first straight portion 50a is a straight portion that continues to the crossover portion 50d or the end portions 63, 64. The second straight portion 50b and the third straight portion 50c are straight portions that continue to one end or the other end of the folded portions 50f, 50g.

[0037] The connecting portion 50j 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. The connecting portion 50j is bent in the circumferential direction after the conductor 50 is attached to the stator core 20, and welded to the connecting portion 50j of the other conductor 50. In the conductor 50 before being attached to the stator core 20, the connecting portion 50j is linearly continuous with the linear portions 50a, 50b, and 50c. The conductor 50 is attached to the stator core 20 by inserting the connecting portion 50j and the linear portions 50a, 50b, and 50c into the slots S from the upper side (one axial side) of the stator core 20. The connecting portion 50j of the conductor 50 is bent in the circumferential direction and welded to the other connecting portion 50j, thereby preventing the conductor 50 from being separated from the stator core 20 in the axial direction.

[0038] The stator 2 of the present embodiment can be assembled by inserting the multiple conductors 50 from above into the slots S of the stator core 20 and joining them at the below. This does not require a complicated assembly process, and the assembly process can be simplified.

[0039] Next, the various types of conductors 50 will be described. The end conductor 51 has one each of end portions 63, 64, a straight portion 50a, and a connecting portion 50j. The end portions 63, 64 are located at the upper end of the end conductor 51. The end portions 63, 64 are bent in the circumferential direction with respect to the straight portion 50a. In the end conductor 51, the end portions 63, 64 and the connecting portion 50j extend in opposite circumferential directions with respect to the straight portion 50a. In the end conductor 51, the end portions 63, 64 extend from the upper end of the straight portion 50a toward one circumferential side θ1, and the connecting portion 50j extends from the lower end of the straight portion 50a toward the other circumferential side θ2.

[0040] One of the neutral point busbar 10, the U-phase busbar 70, the V-phase busbar 80, and the W-phase busbar 90 is connected to the end portions 63, 64. The two end portions 63, 64 are provided at both ends of the conductor connecting body 60. One of the two end portions 63, 64 is a first end portion 63, and the other is a second end portion 64.

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

[0042] In the hairpin conductor 52, the two straight portions 50a are arranged at a number s of slots per pole. Here, the number s of slots per pole refers to the number of slots S of the stator 2 arranged between one magnetic pole of the rotor 3 in a combination of the rotor 3 and the stator 2. The number s of slots per pole is calculated by (total number of slots of the stator 2) / (number of magnetic poles of the rotor 3). In this embodiment, the rotor 3 has 8 magnetic poles and the stator 2 has 48 slots, so the number s of slots per pole is 6. In the hairpin conductor 52, the two straight portions 50a are spaced apart from each other in the circumferential direction by an amount of 6 slots.

[0043] 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 one circumferential side θ1 extends from the lower end of the straight portion 50a to the other circumferential side θ2, and the other located on the other circumferential side θ2 extends from the lower end of the straight portion 50a to the one circumferential side θ1. Twelve hairpin conductors 52 are provided in each of the first conductor connected body 60A and the second conductor connected body 60B.

[0044] The first folding conductor 54 has two straight portions 50b, 50c, two connecting portions 50j, and one first folding portion (folded portion) 50f. The second folding conductor 55 has two straight portions 50b, 50c, two connecting portions 50j, and one second folding portion (folded portion) 50g. The first folding portion 50f and the second folding portion 50g are disposed at the upper end of the first folding conductor 54 or the second folding conductor 55, respectively.

[0045] The first folded portion 50f and the second folded portion 50g connect the two straight portions 50b and 50c to each other. That is, in the first folded conductor 54 and the second folded conductor 55, the two straight portions 50b and 50c are connected to each other via the first folded portion 50f or the second folded portion 50g, respectively.

[0046] In the first folding conductor 54 and the second folding conductor 55, the two connecting portions 50j are folded toward one circumferential side θ1. That is, in the first folding conductor 54 and the second folding conductor 55, the two connecting portions 50j extend toward one circumferential side θ1 from the lower ends of the straight portions 50b and 50c, respectively.

[0047] The first folding conductor 54 and the second folding conductor 55 each have two straight line portions 50b, 50c. Of the two straight line portions 50b, 50c, one located on one circumferential side θ1 is the second straight line portion 50b, and the other located on the other circumferential side θ2 is the third straight line portion 50c.

[0048] In the first turn-back conductor 54 and the second turn-back conductor 55, the distance between each of the two straight portions 50b, 50c is different from each other. In the first turn-back conductor 54, the second straight portion 50b and the third straight portion 50c are arranged in the circumferential direction at a number of slots s+1 per pole (7 slots in this embodiment). On the other hand, in the second turn-back conductor 55, the second straight portion 50b and the third straight portion 50c are arranged in the circumferential direction at a number of slots s-1 per pole (5 slots in this embodiment). Therefore, the first turn-back portion 50f has a larger circumferential span by two slots compared to the second turn-back portion 50g. The first conductor connection body 60A is provided with one first turn-back conductor 54. On the other hand, the second conductor connection body 60B is provided with one second turn-back conductor 55.

[0049] Next, the winding configuration of the first conductor connection body 60A and the second conductor connection body 60B will be described. In the first conductor connection body 60A, the two end conductors 51 are disposed at both ends of the first conductor connection body 60A, respectively, and the first turn-back conductor 54 is disposed approximately in the middle. The first conductor connection body 60A is wave-wound every six slots toward the other circumferential side θ2 from the first end portion 63 to the first turn-back portion 50f. The first conductor connection body 60A is wave-wound every six slots toward one circumferential side θ1 from the first turn-back portion 50f to the second end portion 64.

[0050] Here, in the first conductor connection body 60A, a region that is wave-wound to the other circumferential side θ2 between the first end portion 63 and the first folded-back portion 50f is referred to as the first portion 61. Also, in the first conductor connection body 60A, a region that is wave-wound to one circumferential side θ1 between the first folded-back portion 50f and the second end portion 64 is referred to as the second portion 62. That is, the first conductor connection body 60A has the first end portion 63, the first portion 61 that is wave-wound from the first end portion 63 to the other circumferential side θ2, the first folded-back portion 50f connected to the end of the first portion 61 on the other circumferential side θ2, the second portion 62 that is wave-wound from the first folded-back portion 50f to the one circumferential side θ1, and the second end portion 64 connected to the end of the second portion 62 on the one circumferential side θ1.

[0051] In the second conductor connected body 60B, the two end conductors 51 are respectively arranged at the ends of both ends of the second conductor connected body 60B, and the second turn-back conductor 55 is arranged approximately in the middle. The second conductor connected body 60B is wave-wound every six slots toward the other circumferential side θ2 from the first end portion 63 to the second turn-back portion 50g (first portion 61). The second conductor connected body 60B is wave-wound every six slots toward one circumferential side θ1 from the second turn-back portion 50g to the second end portion 64, which is the second end portion 64 (second portion 62). That is, the second conductor connection body 60B has a first end portion 63, a first portion 61 that is wave-wound from the first end portion 63 toward the other circumferential side θ2, a second folded portion 50g connected to the end of the first portion 61 on the other circumferential side θ2, a second portion 62 that is wave-wound from the second folded portion 50g toward one circumferential side θ1, and a second end portion 64 connected to the end of the second portion 62 on the one circumferential side θ1.

[0052] The conductor connection body 60 of the present embodiment is wave-wound with the number of slots per pole s in the first portion 61 and the second portion 62. That is, the conductor connection body 60 is attached to the stator core 20 in full-pitch winding. Therefore, according to the present embodiment, the multiple conductors 50 arranged in the same slot S are all part of the conductor connection body 60 of the same phase. Therefore, according to the present embodiment, it is not necessary to insulate the conductor connection bodies 60 of different phases within one slot S, making it easy to ensure insulation.

[0053] In this embodiment, the winding portion 30 has a first end portion 63, a second end portion 64, a crossover portion 50d, and turn-back portions 50f, 50g. The first end portion 63, the second end portion 64, the crossover portion 50d, and the turn-back portions 50f, 50g form a coil end 30e on the upper side of the stator core 20. On the other hand, the connecting portion 50j forms a coil end 30e on the lower side of the stator core 20. The first end portion 63 and the second end portion 64 are disposed on the outermost periphery of the coil end 30e. That is, the first end portion 63 and the second end portion 64 are positioned radially outside the multiple crossover portions 50d. The first end portion 63 extends upward (to one axial side) from the stator core 20 and is connected to the phase bus bars 70, 80, 90. Similarly, the second end portion 64 extends upward (to one axial side) from the stator core 20 and is connected to the neutral point busbar 10.

[0054] According to this embodiment, the turn-back portions 50f, 50g are disposed on the innermost periphery of the coil end 30e. That is, the turn-back portions 50f, 50g are disposed radially inward of the multiple transition portions 50d. This allows the radially inner region of the coil end 30e to be used as the routing region for the turn-back portions 50f, 50g, thereby reducing the vertical dimension of the coil end 30e.

[0055] Furthermore, according to this embodiment, the folded-back portions 50f, 50g are located at the innermost periphery of the coil end 30e, so that the two end portions 63, 64 can be located at the outermost periphery of the coil end 30e. That is, according to this embodiment, the first end portion 63 and the second end portion 64 extend from the outermost layer. Therefore, the process of connecting the neutral busbar 10 to the first end portion 63 and the process of connecting the phase busbars 70, 80, 90 to the second end portion 64 can be performed in the radial direction of the coil end 30e, simplifying the manufacturing process of the motor 1.

[0056] As shown in Fig. 4, the first conductor connection body 60A and the second conductor connection body 60B pass through slots S in the opposite order in the circumferential direction at the respective turn-back portions 50f, 50g. The first end portion 63 of the first conductor connection body 60A is located on one circumferential side of the first end portion 63 of the second conductor connection body 60B. The second end portion 64 of the first conductor connection body 60A is located on the other circumferential side of the second end portion 64 of the second conductor connection body 60B. The U-phase connection body pair 69, the V-phase connection body pair 69, and the W-phase connection body pair 69 are arranged in this order toward the other circumferential side θ2.

[0057] <Phase busbar module and neutral busbar module> 1, the phase busbar module 5A and the neutral busbar module 5B are disposed on the upper side of the stator 2. More specifically, the phase busbar module 5A is disposed directly above the coil end 30e. The neutral busbar module 5B is disposed on the upper side of the core back portion 21 and radially outside the coil end 30e. Therefore, the phase busbar module 5A faces the coil end 30e in the axial direction, and the neutral busbar module 5B faces the coil end 30e in the radial direction. In this specification, "directly above" means disposed above and overlapping at least a portion when viewed from the top-bottom direction. Therefore, the phase busbar module 5A is disposed above the coil end 30e and overlapping the coil end 30e when viewed from the top-bottom direction.

[0058] Fig. 5 is a perspective view of the stator 2, phase busbar module 5A, and neutral point busbar module 5B of this embodiment. Fig. 6 is a plan view of the stator 2, phase busbar module 5A, and neutral point busbar module 5B of this embodiment. Fig. 7 is a perspective view of the phase busbar module 5A. Fig. 8 is a perspective view of the neutral point busbar module 5B. Note that in Figs. 7 and 8, the first holding member 5c and the second holding member 5d are omitted.

[0059] 6, the phase busbar module 5A and the neutral busbar module 5B each extend circumferentially. The circumferential position of the phase busbar module 5A and the circumferential position of the neutral busbar module 5B overlap with each other.

[0060] (Phase busbar module) 7, the phase busbar module 5A has phase busbars 70, 80, 90 and a first holding member 5c. That is, the motor 1 has phase busbars 70, 80, 90 and a first holding member 5c. The phase busbars 70, 80, 90 are plate-shaped and formed by pressing.

[0061] Each of the phase busbars 70, 80, 90 has a first main body portion 71, 81, 91, an input terminal portion 78, 88, 98, and a plurality of first terminal portions 79, 89, 99. The first main body portions 71, 81, 91 of each of the phase busbars 70, 80, 90 have the same shape. The plurality of input terminal portions 78, 88, 98 of each of the phase busbars 70, 80, 90 also have the same shape. On the other hand, the plurality of first terminal portions 79, 89, 99 of each of the phase busbars 70, 80, 90 have different shapes.

[0062] The first body portions 71, 81, 91 extend in an arc shape along the circumferential direction. The first body portions 71, 81, 91 are each plate-shaped with the axial direction being the plate thickness direction. The phase busbars 70, 80, 90 are stacked in the axial direction in the first body portions 71, 81, 91. The three first body portions 71, 81, 91 are arranged from top to bottom in the order of the U-phase busbar 70, the V-phase busbar 80, and the W-phase busbar 90. The three first body portions 71, 81, 91 extend in an arc shape along the circumferential direction. The three first body portions 71, 81, 91 are arranged staggered in the circumferential direction. Thus, the phase busbar module 5A has three types of regions arranged in the circumferential direction: a region where three of the three first body portions 71, 81, 91 are stacked, a region where two are stacked, and a region where only one is arranged.

[0063] Each of the phase busbars 70, 80, 90 has two first terminal portions 79, 89, 99. The two first terminal portions 79, 89, 99 are disposed at both ends of each of the phase busbars 70, 80, 90 in the circumferential direction.

[0064] Two first end portions 63 are connected to each of the first terminal portions 79, 89, 99. Therefore, four first end portions 63 are connected to each of the phase bus bars 70, 80, 90.

[0065] The first terminal portions 79, 89, 99 extend radially outward and upward from the outer edges of the first main bodies 71, 81, 91. The positions of the upper ends of the first terminal portions 79, 89, 99 of the three phase busbars 70, 80, 90 coincide with one another. As described above, the first main bodies 71, 81, 91 of the three phase busbars 70, 80, 90 are located at different positions in the up-down direction. For this reason, the protruding dimensions in the up-down direction of the first terminal portions 79 of the phase busbars 70, 80, 90 are different from one another. That is, the protruding dimensions in the up-down direction of the first terminal portions 79 of the U-phase busbar 70, the V-phase busbar 80, and the W-phase busbar 90 increase in this order.

[0066] FIG. 9 is an enlarged view of region IX in FIG. The configuration of the first terminal portion 99 will be described with reference to Fig. 9. Although not shown, the first terminal portions 79, 89 of the other phase bus bars 70, 80 have the same configuration as the first terminal portion 99 shown in Fig. 9.

[0067] The first terminal portion 99 has an extension portion 74 extending from the first main body portion 91, and a terminal body 76 located at the upper end of the extension portion 74. The terminal body 76 is a band-shaped plate portion extending in the circumferential direction with the axial direction (up and down direction) being the plate width direction. The terminal body 76 has both circumferential ends bent radially outward into a U-shape. The bent portions at both circumferential ends of the terminal body 76 constitute a first gripping portion 75. That is, the first terminal portion 99 has two U-shaped first gripping portions 75 that open facing each other.

[0068] The first gripping portion 75 holds the first end portion 63 from both radial sides within the opening. The first gripping portion 75 and the first end portion 63 are welded to each other. As a result, the first end portion 63 is electrically connected to the phase bus bars 70, 80, and 90.

[0069] In this embodiment, two first end portions 63 are connected to each first terminal portion 99. The two conductor connected bodies 60 connected to the first terminal portion 99 of the W-phase bus bar 90 shown in Fig. 9 are the first end portions 63 of the two conductor connected bodies 60 of the W-phase that pass through circumferentially adjacent slots S and are attached to the stator core 20. The same is true for the U-phase and V-phase, where the first terminal portions 79, 89, 99 are connected to two first end portions of the same phase extending from circumferentially adjacent slots S.

[0070] According to this embodiment, the first terminal portion 99 is connected to the first end portion 63 at each of the two first gripping portions 75 whose openings face each other in the circumferential direction. Therefore, the two first gripping portions 75 can be simultaneously clamped from both radial sides by electrodes for resistance welding. The first gripping portions 75 and the first end portion 63 can be welded to each other at two locations simultaneously by resistance welding, simplifying the connection process.

[0071] 5, according to this embodiment, two first end portions 63 of the same phase can be connected to one first terminal portion 79, 89, 99. This allows the number of first terminal portions 79, 89, 99 in the phase busbars 70, 80, 90 to be reduced, and the shape of the phase busbars 70, 80, 90 to be simplified. Furthermore, by arranging the two first end portions 63 close to each other, the phase busbars 70, 80, 90 can be made smaller in size in the circumferential direction as a whole.

[0072] 7, the input terminal portions 78, 88, 98 of the phase busbars 70, 80, 90 extend upward from the inner edges of the first main body portions 71, 81, 91. The input terminal portions 78, 88, 98 are connected to an inverter (not shown) via other busbars (not shown) that are prepared separately. In each of the phase busbars 70, 80, 90, the input terminal portions 78, 88, 98 are disposed between two first terminal portions 79, 89, 99 in the circumferential direction.

[0073] The first holding member 5c is made of an insulating resin material. The first holding member 5c is molded by insert molding in which parts of the phase bus bars 70, 80, and 90 are embedded. In this way, the first holding member 5c holds the three phase bus bars 70, 80, and 90.

[0074] The first holding member 5c embeds the first main body portions 71, 81, 91 of the phase bus bars 70, 80, 90, and exposes the first terminal portions 79, 89, 99 and the input terminal portions 78, 88, 98. The resin member of the first holding member 5c enters between the first main body portions 71, 81, 91 of the phase bus bars 70, 80, 90. That is, an insulating resin member is interposed between the first main body portions 71, 81, 91 that are stacked in the axial direction. This ensures insulation between the first main body portions 71, 81, 91 even when the first main body portions 71, 81, 91 are arranged close to each other.

[0075] The first holding member 5c has three first legs (legs) 5f and one second leg (leg) 5g extending downward (the other axial side) from a portion where the first main body portions 71, 81, 91 are embedded. The first leg 5f is located radially outward from the first main body portions 71, 81, 91. The lower end of the first leg 5f contacts the upper surface of the core back portion 21 (the surface facing one axial side). The second leg 5g is located radially inward from the first main body portions 71, 81, 91. The lower end of the second leg 5g is located on the upper surface of the teeth portion 22. In this way, the phase busbar module 5A is mounted on the stator core 20.

[0076] (Neutral busbar module) As shown in FIG. 8, the neutral point busbar module 5B has a neutral point busbar 10 and a second holding member 5d. That is, the motor 1 has the neutral point busbar 10 and the second holding member 5d. The neutral point busbar 10 is in a plate shape formed by press working. The neutral point busbar 10 has a second main body portion 11 and a plurality of second terminal portions 19. The second main body portion 11 extends in an arc shape along the circumferential direction. The second main body portion 11 is in a plate shape with the plate thickness direction being in the radial direction.

[0077] The neutral point busbar 10 is provided with six second terminal portions 19. Two second end portions 64 are connected to one second terminal portion 19. Thus, twelve second end portions 64 are connected to the neutral point busbar 10. The six second terminal portions 19 are arranged at equal intervals along the circumferential direction of each of the phase busbars 70, 80, 90. The second terminal portions 19 extend upward from the upper edge of the second main body portion 11. The positions of the upper ends of the second terminal portions 19 of the six neutral point busbars 10 coincide with each other.

[0078] As shown in FIG. 9, the second terminal portion 19 has a shape similar to that of the first terminal portion 99. The second terminal portion 19 has an extension portion 14 extending from the second main body portion 11 and a terminal body 16 located at the upper end of the extension portion 14. The terminal body 16 is a strip-shaped plate portion extending in the circumferential direction with the axial direction (vertical direction) being the plate width direction. The terminal body 16 has both circumferential ends bent radially inward into a U-shape. The bending direction of the terminal body 16 of the second terminal portion 19 and the bending direction of the first terminal portion 99 are opposite in the radial direction. The bent portions of both circumferential ends of the terminal body 16 form the second gripping portion 15. That is, the second terminal portion 19 has two U-shaped second gripping portions 15 that open facing each other.

[0079] The second gripping portions 15 hold the second end portions 64 from both radial sides within the opening. The second gripping portions 15 and the second end portions 64 are welded to each other. This electrically connects the second end portions 64 to the neutral busbar 10. Similar to the first terminal portions 79, the second terminal portions 19 can simultaneously hold the two second gripping portions 15 from both radial sides using electrodes for resistance welding, so that the second gripping portions 15 and the second end portions 64 can be welded at two locations simultaneously, simplifying the connection process.

[0080] In this embodiment, two second end portions 64 are connected to one second terminal portion 19. The two conductor connected bodies 60 connected to the second terminal portion 19 are the second end portions 64 of two conductor connected bodies 60 of the same phase (connected body pair 69 shown in FIG. 4) that pass through circumferentially adjacent slots S and are attached to the stator core 20. That is, according to this embodiment, two second end portions 64 of the same phase can be connected to one second terminal portion 19. Therefore, the number of second terminal portions 19 in the neutral point busbar 10 can be reduced, and the shape of the neutral point busbar 10 can be simplified. Furthermore, by arranging the two second end portions 64 close to each other, the neutral point busbar 10 can be made smaller in size in the circumferential direction as a whole.

[0081] As shown in FIG. 6, the first terminals 79, 89, 99 of the phase busbars 70, 80, 90 are connected to the first end 63 from the radially inner side. The second terminal 19 of the neutral busbar 10 is connected to the second end 64 from the radially outer side. That is, the first terminals 79, 89, 99 and the second terminal 19 are connected to the radially opposite sides of the end 63, 64. According to this embodiment, it is possible to prevent the first terminals 79, 89, 99 and the second terminal 19 from being too close to each other, and it is easy to ensure insulation between the first terminals 79, 89, 99 and the second terminal 19. In addition, it is easy to arrange the connection positions of the first terminals 79, 89, 99 and the first end 63 and the connection positions of the second terminals 19 and the second end 64 on the same circumference centered on the central axis J, which simplifies the connection process.

[0082] According to this embodiment, the first terminal portions 79, 89, 99 and the second terminal portions 19 are arranged alternately in the circumferential direction. This makes it easy to dispose the first terminal portions 79, 89, 99 at sufficient distances from each other in the circumferential direction, and makes it easy to ensure insulation between the first terminal portions 79, 89, 99.

[0083] As shown in Fig. 5, according to this embodiment, the first end portion 63 and the second end portion 64 extend upward and are connected at their upper ends to the first terminal portions 79, 89, 99 or the second terminal portion 19. The connection position between the first end portion 63 and the first terminal portions 79, 89, 99 is located above the connection position between the second end portion 64 and the second terminal portion 19. Therefore, even if the first terminal portions 79, 89, 99 and the second terminal portion 19 are arranged close to each other in the circumferential direction, they are separated from each other in the axial direction, so that a linear distance between them can be ensured. This ensures insulation between the first terminal portions 79, 89, 99 and the second terminal portion 19.

[0084] The second holding member 5d is made of an insulating resin member. The second holding member 5d is molded by insert molding in which a part of the neutral point busbar 10 is embedded. In this way, the second holding member 5d holds the neutral point busbar 10. The second holding member 5d contacts the upper surface (surface facing one axial side) of the core back portion 21. In other words, the neutral point busbar module 5B is mounted on the stator core 20.

[0085] The second holding member 5d has two fixing portions 5e that protrude radially outward. The two fixing portions 5e are aligned along the circumferential direction. The fixing portions 5e are fixed to a housing (not shown) that accommodates the motor 1. As shown in Fig. 6, the fixing portions 5e protrude radially outward from the outer edge of the core back portion 21 when viewed in the axial direction.

[0086] According to this embodiment, the phase busbar module 5A is located above the coil end 30e. That is, the phase busbars 70, 80, 90 are located above the coil end 30e. The neutral busbar module 5B is located radially outside the coil end 30e. That is, the neutral busbar 10 is located radially outside the coil end 30e. In this embodiment, the phase busbars 70, 80, 90 and the neutral busbar 10 are separately arranged on the radially outer side and upper side of the coil end 30e. Therefore, the motor 1 can be made smaller in the axial and radial directions than when the phase busbars 70, 80, 90 and the neutral busbar 10 are both arranged on the upper side or radially outside of the coil end 30e.

[0087] In particular, in this embodiment, the radial thickness dimension of the neutral point busbar module 5B arranged radially outward of the coil end 30e can be made smaller than the radial thickness dimension of the core back portion 21. This makes it possible to prevent the phase busbar module 5A and the neutral point busbar module 5B from protruding from the axial projected area of ​​the stator core 20, as shown in Fig. 6, and as a result, the motor 1 can be made more compact.

[0088] According to this embodiment, the phase busbars 70, 80, 90 arranged in the axial direction with respect to the coil end 30e are arranged with the plate thickness direction of the first main body portions 71, 81, 91 as the axial direction. This effectively prevents the axial dimension of the motor 1 from increasing in size. Moreover, the neutral point busbar 10 arranged in the radial direction with respect to the coil end 30e is arranged with the plate thickness direction of the second main body portion 11 as the radial direction. This effectively prevents the radial dimension of the motor 1 from increasing in size.

[0089] According to this embodiment, the multiple phase busbars 70, 80, 90 of the phase busbar module 5A are stacked in the axial direction in the first main body portions 71, 81, 91. Therefore, even if the phase busbar module 5A arranged in the axial direction with respect to the coil end 30e has multiple U-phase busbars 70, 80, 90, it is difficult for the module to become large in the axial direction. As a result, it is possible to suppress an increase in the axial dimension of the motor 1.

[0090] The arrangement of the phase busbar module 5A and the neutral busbar module 5B with respect to the coil end 30e may be opposite to that in this embodiment, which will be described as a modified example with reference to FIG.

[0091] <Modification> FIG. 10 is a schematic cross-sectional view showing a part of a motor 101 according to a modified example. 10, a motor 101 of the modified example has a neutral busbar (first busbar module) 105A and a phase busbar module (second busbar module) 5B. The neutral busbar module 105A is located above the coil end 30e, and the phase busbar module 105B is located radially outside the coil end 30e.

[0092] The neutral point busbar module 105A has a neutral point busbar 110. The neutral point busbar 110 has a plate-shaped main body portion 111 with its axial direction being its plate thickness direction, and a first terminal portion 119.

[0093] On the other hand, phase busbar module 105B has a plurality (three in this embodiment) of phase busbars 170, 180, 190. Each of phase busbars 170, 180, 190 has a plate-shaped main body portion 171, 181, 191 with the plate thickness direction being the radial direction, and a second terminal portion 179. The multiple phase busbars 170, 180, 190 are stacked in the radial direction at main body portions 171, 181, 191.

[0094] According to this modification, the number of bus bars arranged radially outside the coil end 30e is three, and the number of bus bars arranged above the coil end 30e is one. Therefore, it is possible to provide a motor 10 that is larger in the radial direction and smaller in the axial direction compared to the above embodiment. The neutral busbar module 105A and the phase busbar module 105B of this modification are preferably used in a motor 101 in which the radial dimension of the core back portion 21 is relatively large and there is a restriction on the space above the coil end 30e.

[0095] Although the embodiments and modifications of the present invention have been described above, the configurations and combinations thereof in each embodiment and modification are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments. For example, in the above embodiment, the motor is a three-phase motor, but other motors such as a five-phase motor may be used. [Explanation of symbols]

[0096] REFERENCE SIGNS LIST 1...motor, 2...stator, 3...rotor, 5A...phase busbar module (first busbar module), 5B...neutral point busbar module (second busbar module), 10...neutral point busbar (second busbar), 11...second main body portion (main body portion), 15...second gripping portion, 19...second terminal portion, 20...stator core, 30...winding portion, 30e...coil end, 50 ...conductor, 50f...folded portion, 50f...first folded portion (folded portion), 50g...second folded portion (folded portion), 60...conductor connecting body, 63...first end portion, 64...second end portion, 70, 80, 90...phase busbar (first busbar), 71, 81, 91...first main body portion (main body portion), 75...first gripping portion, 79, 89, 99...first terminal portion, J...center axis, S...slot

Claims

1. A rotor rotatable about a central axis; a stator disposed radially outside the rotor; a first bus bar and a second bus bar arranged on one axial side of the stator, The stator includes: a winding portion having a plurality of conductor connections in which a plurality of conductors are connected in series; a stator core having a plurality of slots through which the conductor connector passes; The winding portion has a coil end located on one axial side of the stator core, the conductor connection body has a first end portion and a second end portion located at the radially outermost periphery of the coil end, the first bus bar has a first terminal portion connected to the first end portion; the second bus bar has a second terminal portion connected to the second end portion; the first bus bar is located on one axial side of the coil end, the second bus bar is located radially outward of the coil end, The first terminal portion is connected to the first end portion from a radially inner side, The second terminal portion is connected to the second end portion from the radially outer side. Motor.

2. The second end portion is disposed radially outward from the first end portion. The motor according to claim 1 .

3. The first terminal portions and the second terminal portions are arranged alternately in a circumferential direction.

3. The motor according to claim 1 or 2.

4. The first end portion and the second end portion extend to one side in the axial direction and are connected at their upper ends to the first terminal portion or the second terminal portion, a connection position between the first end portion and the first terminal portion is located on one axial side of a connection position between the second end portion and the second terminal portion; The motor according to claim 3.

5. The first bus bar has a plate-shaped first main body portion whose thickness direction is in the axial direction, The second bus bar has a plate-shaped second main body portion whose thickness direction is in the radial direction. A motor according to any one of claims 1 to 4.

6. The first bus bar is provided in a plurality of positions. The first bus bars are stacked in the axial direction in the first body portion.

6. The motor according to claim 5.

7. The conductor connection body has a folded portion located at the innermost periphery of the coil end. A motor according to any one of claims 1 to 6.

8. The first terminal portion has a U-shaped first gripping portion that is bent toward one radial side and opens in the circumferential direction, and the first gripping portion clamps the first end portion within the opening, The second terminal portion has a U-shaped second gripping portion that is bent toward the other radial side and opens in the circumferential direction, and the second gripping portion holds the second end portion within the opening. A motor according to any one of claims 1 to 7.

9. The winding portion is connected in a 4Y manner by the first bus bar and the second bus bar.

8. The motor according to claim 7.

10. Among the plurality of conductor connections, two of the same phase pass through slots adjacent to each other in the circumferential direction, the first bus bar has the first terminal portion connected to two of the first end portions of the same phase extending from adjacent slots in the circumferential direction, the second bus bar has the second terminal portion connected to two second end portions of the same phase extending from slots adjacent in the circumferential direction, 10. The motor according to claim 9.

11. The first terminal portion has two U-shaped first gripping portions that open facing each other, and each of the first gripping portions holds the first end portion within its opening, The second terminal portion has two U-shaped second gripping portions that open facing each other, and each of the second gripping portions holds the second end portion within its opening. The motor according to claim 10.

12. the first gripping portion and the first end portion are welded together; The second gripping portion and the second end portion are welded to each other.

12. The motor according to claim 11.

13. a first holding member having insulating properties that holds the first bus bar; The first retaining member has a plurality of legs extending to the other axial side and contacting a surface of the stator core facing the one axial side. A motor according to any one of claims 1 to 12.

14. a second insulating holding member that holds the second bus bar; The second retaining member contacts a surface of the stator core facing one axial side. A motor according to any one of claims 1 to 13.

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