motor

Abstract

A motor of the present application includes a rotor rotatable about a central axis and a stator disposed radially outward of the rotor. The stator includes a stator core provided with a plurality of cut grooves arranged in a circumferential direction, and a plurality of conductor connecting bodies constituted by a plurality of conductors connected in series and inserted into the plurality of cut grooves. The conductor connecting bodies have a first portion wave-wound toward one side in the circumferential direction from a first end portion to a second end portion, a second portion wave-wound toward the one side in the circumferential direction from a third end portion to a fourth end portion, and a turn-back portion connecting the first portion and the second portion. The first end portion of the first portion and the third end portion of the second portion and the second end portion of the first portion and the fourth end portion of the second portion respectively protrude in an axial direction from different cut grooves in the circumferential direction. The plurality of conductors include a turn-back conductor connecting the second end portion of the first portion and the fourth end portion of the second portion and constituting the turn-back portion.

Description

Technical Field

[0001] This invention relates to a motor. Background Technology

[0002] In electric vehicle motors, distributed winding is employed to reduce vibration and noise. Patent Document 1 discloses a waveform-wound stator that uses multiple segmented coils to improve motor efficiency.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2017 / 170060 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] In the case of existing waveform winding structures, it is impossible to ensure a long conductor wiring path. On the other hand, by providing a foldback portion in the wiring path of the waveform-wound conductor and then winding the conductor in the opposite direction with the foldback portion in between, the conductor wiring path can be lengthened. However, the segment coil is non-circular, and its flexibility is significantly worse compared to conductors using general round wire. That is, the shape of the foldback portion is very different from the shape of the segment coil outside the foldback portion, thus presenting the following technical problem: in order to avoid other segment coils, the axial dimension of the segment coil in the foldback portion is large, resulting in a large axial dimension of the stator.

[0008] In view of the above, one of the objects of the present invention is to provide a motor that can be miniaturized.

[0009] Technical solutions adopted to solve technical problems

[0010] One embodiment of the motor of the present invention includes: a rotor rotatable about a central axis; and a stator disposed radially outward of the rotor. The stator includes: a stator core having a plurality of circumferentially arranged slots; and a plurality of conductor connectors, each conductor connector being formed by multiple conductors connected in series and inserted into the plurality of slots. Each conductor connector has: a first portion, which is wavyly wound from a first end to a second end toward a circumferential side; a second portion, which is wavyly wound from a third end to a fourth end toward a circumferential side; and a fold-back portion connecting the first portion and the second portion. The first end of the first portion and the third end of the second portion, as well as the second end of the first portion and the fourth end of the second portion, respectively protrude axially from the circumferentially different slots. The plurality of conductors includes a fold-back conductor that connects the second end of the first portion to the fourth end of the second portion and constitutes the fold-back portion.

[0011] Invention Effects

[0012] According to one aspect of the present invention, a motor capable of miniaturization can be provided. Attached Figure Description

[0013] Figure 1 This is a cross-sectional schematic diagram of a motor according to one embodiment.

[0014] Figure 2 It is along Figure 1 A cross-sectional view of the motor along line II-II.

[0015] Figure 3 This is a schematic diagram showing a circuit composed of a winding section and a busbar unit according to one embodiment.

[0016] Figure 4 This is a perspective view of the stator in one embodiment.

[0017] Figure 5 This is a schematic diagram showing the winding structure of a conductor connector according to one embodiment.

[0018] Figure 6 This is a perspective view of a conductor unit according to one embodiment.

[0019] Figure 7 This is a perspective view of multiple folding conductors in one embodiment.

[0020] Figure 8 This is a perspective view of a busbar unit according to one embodiment.

[0021] Figure 9 This is a partial cross-sectional view of a motor according to one embodiment.

[0022] Figure 10 This is a partial cross-sectional schematic diagram of a modified motor.

[0023] Figure 11 This is a schematic diagram showing the folded-back portion of the comparative embodiment. Detailed Implementation

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

[0025] Furthermore, the terms "upper and lower," "upper side," and "lower side" are merely names used to describe the configuration relationships of each part; the actual configuration relationships may be other than those indicated by these names. Moreover, even if the directions described as one axial side and the other axial side are interchanged, the effect 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 effect of the embodiment can be reproduced.

[0026] <Motor>

[0027] Figure 1 This is a cross-sectional schematic diagram showing the motor 1 of this embodiment.

[0028] The motor 1 in this embodiment is an internal rotor type motor. Furthermore, the motor 1 in this embodiment is a three-phase AC motor. The center of the motor 1 is the central axis J. The motor 1 includes a rotor 3, a stator 2, a bearing retainer 4, and a housing 1a that houses them.

[0029] <Rotor>

[0030] The rotor 3 is capable of rotating about the central axis J. The rotor 3 is arranged radially inside the annular stator 2. That is, the rotor 3 is radially opposite to the stator 2. The rotor 3 has a shaft 3a, a rotor magnet 3b, and a rotor core 3c.

[0031] Shaft 3a extends axially along the central axis J. For example, shaft 3a is cylindrical, extending axially about the central axis J. Shaft 3a is supported by two bearings 3p so that it can rotate about the central axis J.

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

[0033] The rotor core 3c is constructed by stacking electromagnetic steel plates. The rotor core 3c is cylindrical, extending axially. The inner circumferential surface of the rotor core 3c is fixed to the outer circumferential surface of the shaft 3a. A retaining hole 3h is provided at the rotor core 3c for inserting and fixing the rotor magnet 3b.

[0034] The rotor magnet 3b is radially opposed to the stator 2. The rotor magnet 3b is held embedded in the rotor core 3c. In this embodiment, the rotor magnet 3b is an eight-pole magnet. The number of poles of the rotor 3 is not limited to this embodiment. In addition, the rotor magnet 3b can also be other types of magnets such as a ring-shaped magnet.

[0035] <Stator>

[0036] like Figure 1 As shown, the stator 2 is radially opposed to the rotor 3 with a gap between them. 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, a plurality of insulating papers 6, a busbar unit 5, and a conductor retainer 80.

[0037] like Figure 1 As shown, the stator core 20 is annular with the central axis J as its center. The stator core 20 is composed of multiple electromagnetic steel plates stacked axially. The stator core 20 has: a cylindrical core back 21 centered on the central axis J; and multiple pole teeth 22 extending radially inward from the core back 21.

[0038] Multiple pole teeth 22 are arranged at equal intervals along the circumference. An umbrella-shaped portion 22a is provided at the front end of the radially inner side of the pole teeth 22. The umbrella-shaped portion 22a protrudes circumferentially to both sides relative to the pole teeth 22. That is, the circumferential dimension of the umbrella-shaped portion 22a is larger than the circumferential dimension of the pole teeth 22. The radially inner surface of the umbrella-shaped portion 22a is radially opposed to the outer circumferential surface of the rotor 3 with a gap between them.

[0039] The winding portion 30 is mounted on the pole tooth portion 22. A slot S is provided between adjacent circumferentially spaced pole tooth portions 22. That is, a plurality of slots S arranged circumferentially are provided at the stator core 20.

[0040] The conductor 50 of the winding section 30 is housed within the slots S. Furthermore, an insulating paper 6 is disposed within each slot S. The insulating paper 6 within the slots S ensures that the winding section 30 is insulated from the stator core 20.

[0041] A groove S has six layers arranged radially. Each layer in the groove has a conductor 50. The six conductors 50 are arranged in a row radially within the groove S.

[0042] The groove S has an opening 29h that opens radially inward. The opening 29h is located between the umbrella-shaped portions 22a at the front ends of adjacent pole teeth 22. The circumferential width of the opening 29h is smaller than the circumferential dimension of the conductor 50. Therefore, the conductor 50 is less likely to pass through the opening 29h, and the conductor 50 is prevented from detaching from the stator core 20.

[0043] In this embodiment, the stator core 20 has forty-eight pole teeth 22. That is, the stator 2 in this embodiment has 48 slots. In addition, the number of slots in the stator 2 can be appropriately set according to the number of poles of the rotor magnet 3b and the winding method of the winding section 30.

[0044] Figure 3 This is a schematic diagram showing the circuit formed by the winding section 30 and the bus unit 5 in this embodiment.

[0045] The winding section 30 of this embodiment has a plurality of conductor connections 60 (six in this embodiment) constituting a segment coil. The six conductor connections 60 are classified into two U-phase conductor connections 60U, two V-phase conductor connections 60V, and two W-phase conductor connections 60W. That is, the plurality of conductor connections 60 are classified into multiple phases. Furthermore, the plurality of conductor connections 60 includes a plurality of conductor connections 60 of the same phase.

[0046] In addition, bus unit 5 has three phase buses 11, 12, and 13 and a neutral point bus 10, which will be described in detail below. The three phase buses 11, 12, and 13 are classified as U-phase bus 11, V-phase bus 12, and W-phase bus 13.

[0047] The neutral point busbar 10 and phase busbars 11, 12, and 13 are used to Y-connect the U-phase conductor connector 60U, the V-phase conductor connector 60V, and the W-phase conductor connector 60W. In this embodiment, two Y-connections are formed corresponding to the two conductor connectors 60 of each phase, and the Y-connections are connected in parallel. That is, the winding section 30 is 2Y-connected using the busbar unit 5.

[0048] Furthermore, in this embodiment, the case where the winding section 30 has a three-phase six-conductor connection 60 with two conductors of the same phase will be described. However, as long as the winding section 30 has at least two conductor connections 60 of the same phase and they form a pair of connections 69 passing through circumferentially adjacent slots S, the same winding structure as in this embodiment can be used. Therefore, M can be set to a natural number, and the multiple conductor connections 60 can be Y-connected as long as they are 2×M (in this embodiment, M=2).

[0049] The conductor connector 60 has a first end portion 63 and a second end portion 64. The first end portion 63 and the second end portion 64 are respectively disposed at one end and the other end of the conductor connector 60. Between the first end portion 63 and the second end portion 64, the conductor connector 60 is mounted on the stator core 20 to form the coils of each phase. The conductor connector 60 is connected to the bus unit 5 at the first end portion 63 and the second end portion 64.

[0050] The second ends 64 of the two U-phase conductor connectors 60U, the two V-phase conductor connectors 60V, and the two W-phase conductor connectors 60W are connected to a neutral point busbar 10. Thus, the second ends 64 of the six conductor connectors 60 are at the same potential, forming the neutral point. That is, the neutral point busbar 10 forms the neutral point of the three-phase circuit.

[0051] The first end 63 of the two U-phase conductor connectors 60U is connected to the U-phase busbar 11. The first end 63 of the two V-phase conductor connectors 60V is connected to the V-phase busbar 12. The first end 63 of the two W-phase conductor connectors 60W is connected to the W-phase busbar 13. Alternating currents with phases staggered by 120° flow to the phase busesbars 11, 12, and 13 respectively.

[0052] Two conductors 60 of the same phase are mounted on the stator core 20 through adjacent slots S. In this specification, the two conductors 60 passing through adjacent slots S are referred to as a pair of conductors 69. Furthermore, in the following description, when distinguishing between the two conductors 60 constituting the pair of conductors 69, one will be referred to as the first conductor 60A and the other as the second conductor 60B.

[0053] Figure 4 This is a perspective view of the stator 2 in this embodiment. Figure 5 This is a schematic diagram showing the winding structure of the two conductor connections 60 that constitute the connection pair 69.

[0054] like Figure 5 As shown, the conductor connector 60 is composed of multiple conductors 50 connected in series. The conductor connector 60 is inserted into multiple slots S to form a wavy wire.

[0055] The multiple conductors 50 constituting the conductor connector 60 are classified as a first end conductor 51, a hairpin conductor 52, a second end conductor 53, and return conductors 54 and 55. That is, the multiple conductors 50 include a first end conductor 51, a hairpin conductor 52, a second end conductor 53, and return conductors 54 and 55.

[0056] All conductors 50 except for the return conductors 54 and 55 (first end conductor 51, hairpin conductor 52, and second end conductor 53) pass through grooves S at the straight section 50a (described later). The conductors 50 passing through these grooves S are composed of bent flat wires. Therefore, compared to using round wires, the fill factor of the conductor 50 in the grooves S can be increased. Furthermore, in this specification, "flat wire" refers to a wire with a quadrilateral or approximately quadrilateral cross-sectional shape. In this specification, "approximately quadrilateral" includes a quadrilateral with rounded corners. Although figures are omitted, in this embodiment, the conductor 50 has a enamel coating on its surface.

[0057] All conductors 50 except for the return conductors 54 and 55 have at least a straight portion 50a extending linearly along the axial direction (Z direction) and a connecting portion 50j located at the lower end (the other side of the axial direction). The straight portion 50a passes through a slot S. That is, the conductor connector 60 is housed in the slot S at the straight portion 50a. In the area other than the straight portion 50a, the conductor connector 60 extends towards the upper and lower sides of the stator core 20. The portions extending towards the upper and lower sides of the stator core 20 constitute the coil end 30e of the stator core 20 (see reference). Figure 1 ).

[0058] The connecting portion 50j is connected to the connecting portions 50j of other conductors 50. The connecting portions 50j of a pair of conductors 50 are joined together by welding or other joining methods. After the conductor 50 is installed on the stator core 20, the connecting portion 50j is bent in the circumferential direction and welded to the connecting portions 50j of other conductors 50. In the conductors 50 installed before the stator core 20, the connecting portion 50j is in a straight line continuous with the straight portion 50a. The conductor 50 is installed on the stator core 20 by inserting the connecting portion 50j and the straight portion 50a into the groove S from the upper side (axial side) of the stator core 20. By bending the connecting portion 50j in the circumferential direction and joining it with other connecting portions 50j, the conductor 50 can be prevented from detaching from the stator core 20 in the axial direction.

[0059] The stator 2 of this embodiment can be assembled by inserting multiple conductors 50 into the slots S of the stator core 20 from the top and engaging them from the bottom. Therefore, a complex assembly process is eliminated, simplifying the assembly process.

[0060] Next, the various conductors 50 will be described.

[0061] Each of the first end conductors 51 has a first end 61a or a third end 62a, a straight portion 50a, and a connecting portion 50j. The first end 61a and the third end 62a are located at the upper end of the first end conductor 51. The first end 61a and the third end 62a extend upward from the straight portion 50a. In the first end conductor 51, the connecting portion 50j extends circumferentially to one side θ1 from the lower end of the straight portion 50a.

[0062] Two first end conductors 51 are provided in a conductor connector 60. Therefore, a first end 61a and a third end 62a are respectively provided in a conductor connector 60. The first end 61a and the third end 62a are the end portions constituting the two ends of the conductor connector 60. Of the first end 61a and the third end 62a of the conductor connector 60, the first end 61a is a first end portion 63, and the third end 62a is a second end portion 64. Any one of the U-phase busbar 11, the V-phase busbar 12, and the W-phase busbar 13 is connected to the first end portion 63. The neutral point busbar 10 is connected to the second end portion 64.

[0063] The hairpin conductor 52 has two straight sections 50a, two connecting sections 50j, and a transition section 50d. The transition section 50d is disposed at the upper end of the hairpin conductor 52. The transition section 50d transitions the two straight sections 50a to each other. That is, in the hairpin conductor 52, the two straight sections 50a are connected to each other via the transition section 50d. In the hairpin conductor 52, the two connecting sections 50j are respectively connected to the lower ends of different straight sections 50a. A plurality of transition sections 50d protrude from the upper (axial side) end face of the stator core 20.

[0064] In the hairpin conductor 52, the two straight sections 50a are arranged relative to each other with a number of slots s per pole. Here, the number of slots s per pole refers to the number of slots S of the stator 2 disposed between one pole of the rotor 3 in the combination of the rotor 3 and the stator 2. The number of slots s per pole is calculated by (total number of slots in the stator 2) / (number of poles in the rotor 3). In this embodiment, the number of poles in the rotor 3 is 8, and the number of slots in the stator 2 is 48, therefore, the number of slots s per pole is 6. In the hairpin conductor 52, the two straight sections 50a are circumferentially separated from each other by an amount of 6 slots.

[0065] In the hairpin conductor 52, the bending directions of the two connecting portions 50j are opposite to each other in the circumferential direction. Of the two connecting portions 50j, the one located on one circumferential side θ1 extends from the lower end of the straight portion 50a toward the circumferential side θ1, and the other one located on the other circumferential side θ2 extends from the lower end of the straight portion 50a toward the other circumferential side θ2. The first conductor connector 60A and the second conductor connector 60B are each provided with six hairpin conductors 52.

[0066] Each of the second end conductors 53 has a second end 61b or a fourth end 62b, a straight portion 50a, and a connecting portion 50j. The second end 61b and the fourth end 62b are located at the upper end of the second end conductor 53. The second end 61b and the fourth end 62b are bent in the circumferential direction relative to the straight portion 50a. In the second end conductor 53, the second end 61b and the fourth end 62b and the connecting portion 50j are on opposite sides of the circumferential direction relative to the straight portion 50a. In the second end conductor 53, the second end 61b and the fourth end 62b extend from the upper end of the straight portion 50a to one circumferential side θ1, and the connecting portion 50j extends from the lower end of the straight portion 50a to the other circumferential side θ2.

[0067] Two second end conductors 53 are provided in a conductor connector 60. Therefore, a second end 61b and a fourth end 62b are respectively provided in a conductor connector 60. The second end 61b and the fourth end 62b provided in a conductor connector 60 are connected by folded-back conductors 54 and 55.

[0068] The return conductors 54 and 55 are classified as a first return conductor 54 for the first conductor connector 60A and a second return conductor 55 for the second conductor connector 60B. Therefore, a return conductor 54 or 55, either the first return conductor 54 or the second return conductor 55, is provided in a conductor connector 60.

[0069] In the first conductor connector 60A, the first return conductor 54 connects the second end 61b to the fourth end 62b. Similarly, in the second conductor connector 60B, the second return conductor 55 connects the second end 61b to the fourth end 62b. The distances between the second end 61b and the fourth end 62b in the first conductor connector 60A and the second conductor connector 60B are different from each other. In the first conductor connector 60A, the second end 61b and the fourth end 62b are arranged circumferentially with a spacing of s+1 (7 slots in this embodiment) per pole. On the other hand, in the second conductor connector 60B, the second end 61b and the fourth end 62b are arranged circumferentially with a spacing of s-1 (5 slots in this embodiment) per pole. Therefore, compared with the second return conductor 55, the circumferential transition amount of the first return conductor 54 is two slots larger.

[0070] Regarding the specific shapes of conductors 54 and 55 used for folding back, use Figure 7 This will be explained in detail later.

[0071] Next, the winding structure of the first conductor connector 60A and the second conductor connector 60B will be described.

[0072] The first conductor connector 60A is wavy-wound in a circumferential direction θ1 from the first end portion 63 to the first return conductor 54, with six slots cut in each direction. Furthermore, the first conductor connector 60A is wavy-wound in a circumferential direction θ1 from the second end portion 64 to the first return conductor 54, with six slots cut in each direction.

[0073] Here, the region in the first conductor connector 60A where the first end portion 63 and the first return conductor 54 are wavy-wound towards the circumferential side θ1 is called the first portion 61. Furthermore, the region in the first conductor connector 60A where the second end portion 64 and the first return conductor 54 are wavy-wound towards the circumferential side θ1 is called the second portion 62. Additionally, the end of the first portion 61 on the other circumferential side θ2 is called the first end portion 61a. The end of the second portion 62 on the other circumferential side θ2 is called the third end portion 62a. Furthermore, the ends of the first portion 61 on the circumferential side θ1 are also called the second end portion 61b. The end of the second portion 62 on the circumferential side θ1 is called the fourth end portion 62b. Furthermore, the portion in the first conductor connector 60A that connects the first portion 61 and the second portion 62 is called the return portion 67. The first conductor connector 60A has a first portion 61, a second portion 62, and a folded-back portion 67. The first portion 61 is wound from the first end 61a to the second end 61b in a circumferential wave θ1 direction. The second portion 62 is wound from the third end 62a to the fourth end 62b in a circumferential wave θ1 direction. The folded-back portion 67 connects the first portion 61 and the second portion 62. The folded-back portion 67 of the first conductor connector 60A is formed by a first folded-back conductor 54.

[0074] The second conductor connector 60B is wavy-wound in a pattern of six slots per circumferential direction θ1 from the first end portion 63 to the second return conductor 55. Furthermore, the second conductor connector 60B is also wavy-wound in a pattern of six slots per circumferential direction θ1 from the second end portion 64 to the second return conductor 55. Similar to the first conductor connector 60A, the second conductor connector 60B has a first portion 61, a second portion 62, and a return portion 67. Specifically, the first portion 61 is wavy-wound from the first end portion 61a to the second end portion 61b in a pattern of circumferential direction θ1, the second portion 62 is wavy-wound from the third end portion 62a to the fourth end portion 62b in a pattern of circumferential direction θ1, and the return portion 67 connects the first portion 61 and the second portion 62. The return portion 67 of the second conductor connector 60B is formed by the second return conductor 55.

[0075] In a single conductor connector 60, the first portion 61 and the second portion 62 are wound in a wave-like manner, each passing through a different groove S. Therefore, the first end 61a of the first portion 61 and the third end 62a of the second portion 62 protrude axially from the different circumferential grooves S. The second end 61b of the first portion 61 and the fourth end 62b of the second portion 62 protrude axially from the different circumferential grooves S. Fold-back conductors 54 and 55 connect the second end 61b and the fourth end 62b extending from the different grooves S.

[0076] Furthermore, in this embodiment, the first portion 61 of the first conductor connector 60A and the second portion 62 of the second conductor connector 60B pass through the same groove S. Similarly, the second portion 62 of the first conductor connector 60A and the first portion 61 of the second conductor connector 60B pass through the same groove S.

[0077] In this embodiment, the first end 61a, the second end 61b, the third end 62a, and the fourth end 62b all protrude upwards (to the axial side) relative to the stator core 20. Therefore, the busbars 10, 11, 12, and 13 connected to the first end 61a and the third end 62a are positioned on the upper side of the stator core 20. The return conductors 54 and 55 connected to the second end 61b and the fourth end 62b are positioned on the upper side of the stator core 20.

[0078] In this embodiment, the conductor connector 60 is waveform-wound at the first portion 61 and the second portion 62 according to the number of slots per pole, s. That is, the conductor connector 60 is mounted on the stator core 20 as a full-pitch winding. Therefore, according to this embodiment, the plurality of conductors 50 arranged in the same slot S are all part of the conductor connector 60 of the same phase. According to this embodiment, it is not necessary to insulate conductor connectors 60 of different phases in one slot S, making it easy to ensure insulation.

[0079] In the conductor connector 60 of this embodiment, the return portion 67 is composed of a single conductor 50. That is, the plurality of conductors 50 include return conductors 54 and 55 constituting the return portion 67. The return conductors 54 and 55 connect the second end 61b of the first portion 61 to the fourth end 62b of the second portion 62 on the upper side of the stator core 20.

[0080] Here, as part of the existing structure, Figure 11The foldback portion 167 of the comparative embodiment is schematically shown. The foldback portion 167 of the comparative embodiment is configured as part of a hairpin-shaped conductor. The foldback portion 167 of the comparative embodiment extends upward from the straight portion 50a. Therefore, in order to suppress interference with the transition portion 50d of other conductors 50, the foldback portion 167 of the comparative embodiment has a recessed region 150A that protrudes upward from the upper end of the transition portion 50d. Furthermore, in order to suppress interference with the transition portion 50d, the foldback portion 167 of the comparative embodiment extends in a region lower than the recessed region 150A in a manner along the inclined direction of the transition portion 50d. The transition portion 50d tilts towards the circumferential side θ1 as it tilts upward. Therefore, the foldback portion 167 is formed in the recessed region 150A in a hairpin shape, making a U-shaped bend from the circumferential side θ1 to the circumferential side θ2. Thus, in the comparative embodiment, the protrusion height of the folding portion 167f relative to the transition portion 50d at the retreat region 150A is increased. Furthermore, in the folding portion 167 of the comparative embodiment, the following technical problem exists: a complex hairpin shape needs to be provided at the retreat region 150A, and the assembly process can easily become difficult.

[0081] In contrast, according to this embodiment, in the conductor connector 60, the return portion 67 is composed of a single conductor 50, namely, return conductors 54 and 55. The return conductors 54 and 55 do not pass through the slot S. Therefore, in the assembly process of assembling the winding portion 30 to the stator core 20, there is no process where the return conductors 54 and 55 pass through the slot S. As a result, even if the return conductors 54 and 55 are configured with complex shapes, the complexity of the assembly process of the winding portion 30 can be suppressed.

[0082] Furthermore, in the conductor connector 60 of this embodiment, the return conductors 54 and 55 are structures that can be separated from the other conductors 50. Therefore, the return conductors 54 and 55 can be shortened and can be configured into simple shapes. As a result, the return conductors 54 and 55 can be manufactured at low cost, and the motor 1 can be manufactured cheaply.

[0083] In this embodiment, the winding portion 30 has a first portion 61 and a second portion 62, and the first portion 61 and the second portion 62 have a plurality of transition portions 50d and connecting portions 50j. The plurality of transition portions 50d form coil ends 30e on the upper side of the stator core 20. On the other hand, the connecting portions 50j form coil ends 30e on the lower side of the stator core 20.

[0084] The first end 61a of the first portion 61 and the third end 62a of the second portion 62 are disposed on the upper side of the stator core 20 and on the outermost periphery of the coil end 30e. That is, the first end 61a and the third end 62a are located radially outside the plurality of transition portions 50d. The first end 61a of the first portion 61 extends upward (axially) from the stator core 20 and is connected to the phase busbars 11, 12, and 13. Similarly, the third end 62a of the second portion 62 extends upward (axially) from the stator core 20 and is connected to the neutral point busbar 10. According to this embodiment, since the first end 61a of the first portion 61 and the third end 62a of the second portion 62 are disposed on the outermost periphery of the coil end 30e, the busbar unit 5 can be disposed radially outside the coil end 30e. As a result, compared with the case where the busbar unit 5 is disposed on the upper side of the coil end 30e, the vertical dimension of the motor 1 can be miniaturized.

[0085] Furthermore, the second end 61b of the first portion 61 and the fourth end 62b of the second portion 62 are disposed on the upper side of the stator core 20 and at the innermost periphery of the coil end 30e. That is, the second end 61b and the fourth end 62b are located radially inside the plurality of transition portions 50d. Therefore, the return conductor 54 is connected to the second end 61b and the fourth end 62b at the innermost periphery of the coil end 30e. According to this embodiment, the joining process of the return conductor 54 to the second end 61b and the fourth end 62b can be performed from the radially inside the coil end 30e, and the joining process can be performed easily.

[0086] <Conductor for Turnback>

[0087] Figure 6 This is a perspective view of the conductor retainer 80 and multiple return conductors 54 and 55. Furthermore, Figure 7 It is a three-dimensional diagram of multiple folding conductors 54 and 55.

[0088] Figure 6 The conductor holding member 80 and the plurality of return conductors 54 and 55 shown constitute the conductor unit 7. That is, the conductor unit 7 has the conductor holding member 80 and the plurality of return conductors 54 and 55.

[0089] In this embodiment, six conductor connectors 60 are provided at the winding section 30. Therefore, six return conductors 54 and 55 are provided at the winding section 30. The six return conductors 54 and 55 are supported by a conductor holder 80.

[0090] like Figure 4 As shown, conductor unit 7 is located above stator core 20. Furthermore, conductor 7 is located above coil end 30e, which is also located above stator core 20. When viewed axially, conductor unit 7 overlaps with coil end 30e.

[0091] like Figure 7 As shown, the six return conductors 54 and 55 include three first return conductors 54 and three second return conductors 55. Furthermore, the three first return conductors 54 are the return portions 67 of the conductor connections 60 for the U-phase, V-phase, and W-phase, respectively. Similarly, the three second return conductors 55 are the return portions 67 of the conductor connections 60 for the U-phase, V-phase, and W-phase, respectively.

[0092] In the following description, the first return conductor 54 for the U phase is sometimes referred to as the first conductor 54U for the U phase, and the second return conductor 55 for the U phase is sometimes referred to as the second conductor 55U for the U phase. Similarly, the first return conductor 54 for the V phase is sometimes referred to as the first conductor 54V for the V phase, and the second return conductor 55 for the V phase is sometimes referred to as the second conductor 55V for the V phase. Furthermore, the first return conductor 54 for the W phase is sometimes referred to as the first conductor 54W for the W phase, and the second return conductor 55 for the W phase is sometimes referred to as the second conductor 55W for the W phase.

[0093] As Figure 5 As explained in the basic description, the first return conductor 54 spans seven slots S (s+1 per pole), and the second return conductor 55 spans five slots S (s-1 per pole). Furthermore, the two slots S extending from the first return conductor 54 are positioned circumferentially outward relative to the two slots S extending from the second return conductor 55. Figure 7 As shown, the first return conductor 54 is configured to cross the second return conductor 55 from both radially outward and circumferentially on both sides. Figure 5 As shown, one of the two in-phase conductor connectors 60 passing through adjacent slots S (the second conductor connector 60B) extends at the second return conductor 55 between slots S spaced s-1 apart, while the other (the first conductor connector 60A) extends at the first return conductor 54 between slots S spaced s+1 apart. Furthermore, the other conductor (the first conductor connector 60A) passes at the first return conductor 54 on the radially outer side (in this embodiment, the radially outer side) of the second return conductor 55 of the first conductor connector 60B. Thus, the first return conductor 54 and the second return conductor 55 can suppress mutual interference while preventing them from becoming excessively large in both the axial and radial directions.

[0094] like Figure 7 As shown, the first folding conductor 54 has a conductor body portion 54a, two radial extension portions 54b, and two connecting terminals 54c. Similarly, the second folding conductor 55 has a conductor body portion 55a, two radial extension portions 55b, and two connecting terminals 55c.

[0095] Similar to other conductors 50, the return conductors 54 and 55 can also be formed by forming flat wires. Furthermore, the return conductors 54 and 55 can also be formed by punching sheet metal, similar to the busbars 10, 11, 12, and 13 described later. In this embodiment, the return conductors 54 and 55 do not pass through the groove S. Therefore, for the return conductors 54 and 55, a punching process that forms an unstable cross-sectional shape can be used, allowing for the inexpensive manufacture of the motor 1. That is, in this embodiment, the return conductors 54 and 55 can also be plate-shaped, in which case they can be formed by punching. By making the axial direction the thickness direction at the conductor body portions 54a and 55a and the radial extension portions 54b and 55b, and the radial direction the thickness direction at the connecting terminals 54c and 55c, the return conductors 54 and 55 can be easily formed by punching.

[0096] In the turnaround conductors 54 and 55, the conductor body portions 54a and 55a extend circumferentially. Radial extension portions 54b and 55b are respectively provided at both ends of the conductor body portions 54a and 55a. The radial extension portions 54b and 55b extend radially inward from the conductor body portions 54a and 55a. Connecting terminals 54c and 55c are provided at the radially inward ends of the radial extension portions 54b and 55b. That is, connecting terminals 54c and 55c for connecting with other conductors 50 are provided at both ends of the turnaround conductors 54 and 55. The connecting terminals 54c and 55c extend upward from the radial extension portions 54b and 55b.

[0097] The conductor body portions 54a and 55a of the first return conductor 54 and the second return conductor 55 respectively extend in an arc shape centered on the central axis J. Viewed axially, the conductor body portions 54a of the three first return conductors 54 (i.e., the first conductor 54U for U-phase, the first conductor 54V for V-phase, and the first conductor 54W for W-phase) are arranged on the same circumference. Similarly, the conductor body portions 55a of the three second return conductors (i.e., the second conductor 55U for U-phase, the second conductor 55V for V-phase, and the second conductor 55W for W-phase) are arranged on the same circumference. The diameter of the circumference of the conductor body portions 54a of the first return conductors 54 is larger than the diameter of the circumference of the conductor body portions 55a of the second return conductors 55. Therefore, the conductor body portions 54a of the first return conductors 54 pass radially outward of the conductor body portions 55a of the second return conductors 55.

[0098] The first conductor 54U and the second conductor 55U for the U phase are arranged at the same height in the vertical direction. Similarly, the first conductor 54V and the second conductor 55V for the V phase are arranged at the same height in the vertical direction. The first conductor 54W and the second conductor 55W for the W phase are arranged at the same height in the vertical direction. Furthermore, the conductor body portions 54a and 55a are arranged upwards in the order of U phase, V phase, and W phase. That is, the conductor body portions 54a for the V phase and W phase are arranged directly above the conductor body portion 54a for the U phase, and the conductor body portions 55a for the V phase and W phase are arranged directly above the conductor body portion 55a for the U phase. The conductor body portion 54a for the W phase is arranged directly above the conductor body portion 54a for the V phase, and the conductor body portion 55a for the V phase is arranged directly above the conductor body portion 55a for the V phase.

[0099] Additionally, "directly above" in this specification means that the arrangement overlaps at least partially when viewed from above and from the top and bottom.

[0100] According to this embodiment, at least a portion of the return conductors 54 and 55 of different phases overlap each other when viewed from the axial direction. Therefore, compared to arranging the return conductors of different phases in the circumferential or radial direction, the space for arranging the multiple return conductors 54 and 55 can be miniaturized in both the circumferential and radial directions. As a result, the stator 2 can be miniaturized. Furthermore, since the multiple return conductors 54 and 55 are densely arranged in both the circumferential and radial directions, the conductor holding member 80 that holds the multiple return conductors 54 and 55 can be miniaturized, and the stator 2 can be made lighter.

[0101] Furthermore, according to this embodiment, by changing the height of the return conductors 54 and 55 according to phase and configuring them, the return conductors 54 and 55 of different phases can be made to have the same shape. Furthermore, in this embodiment, by arranging the return conductors 54 and 55 of different phases staggered in the circumferential direction, the connection terminals 54c and 55c of different phases can be arranged separately in the circumferential direction. That is, in this embodiment, the return conductors 54 and 55 of different phases have the same shape and are arranged staggered in the circumferential direction. More specifically, the U-phase first conductor 54U, V-phase first conductor 54V, and W-phase first conductor 54W of this embodiment have the same shape. Similarly, the U-phase second conductor 55U, V-phase second conductor 55V, and W-phase second conductor 55W of this embodiment have the same shape. According to this embodiment, components with the same shape can be used as the return conductors 54 and 55 of each phase, which can suppress the increase in the number of components constituting the winding section 30 and enable the stator 20 to be manufactured inexpensively.

[0102] According to this embodiment, the return conductors 54 and 55 of different phases are staggered in the circumferential and axial directions, thus forming a stepped arrangement when viewed radially. That is, the return conductors 54 and 55 of the U phase, V phase, and W phase are arranged from the bottom to the top and from one circumferential side θ1 to the other circumferential side θ2. Therefore, by arranging the connection terminals 54c and 55c of different phases separately in the circumferential direction and partially overlapping the return conductors 54 and 55 of different phases, they can be densely arranged, and miniaturization of the conductor unit 7 can be achieved.

[0103] As described above, in the phase-interleaving return conductors 54 and 55, the conductor body portion 54a of one side is arranged radially outside the conductor body portion 55a of the other side. Therefore, in this embodiment, the phase-interleaving return conductors 54 and 55 overlap radially at the conductor body portions 54a and 55a. That is, the phase-interleaving return conductors 54 and 55 are arranged at the same height. If all the return conductors 54 and 55 are stacked axially, the axial dimension will be large. In contrast, by arranging the phase-interleaving return conductors 54 and 55 in a radially overlapping manner, it is possible to suppress the excessively large axial space of the return conductors 54 and 55, and to achieve miniaturization of the motor 1.

[0104] According to this embodiment, the return conductors 54 and 55 are positioned directly above the coil end 30e. The return conductors 54 and 55 are positioned radially outward relative to the connected second end 61b and fourth end 62b, and overlap axially. Therefore, with... Figure 11 Compared to the comparative embodiment where the folded-back portion 167 is retracted upwards, its protrusion upwards relative to the coil end 30e can be suppressed. This allows for miniaturization of the motor 1.

[0105] like Figure 6 As shown, the connecting terminals 54c and 55c of the folding conductors 54 and 55 protrude from the conductor holder 80. A second end 61b of the first portion 61 or a fourth end 62b of the second portion 62 is connected to the connecting terminals 54c and 55c. The connecting terminals 54c and 55c, the second end 61b, and the fourth end 62b all extend axially. The connecting terminals 54c and 55c are radially opposed to and in contact with the second end 61b, and are electrically and mechanically connected. The connecting terminals 54c and 55c are radially opposed to and in contact with the fourth end 62b, and are electrically and mechanically connected.

[0106] A total of twelve connection terminals 54c and 55c are provided at conductor unit 7. All connection terminals 54c and 55c of conductor unit 7 are arranged on the same circumference centered on the central axis J. Therefore, in the joining process of connection terminals 54c and 55c with the second end 61b or the fourth end 62b, the clamp for joining (e.g., the electrode pair for resistance welding) can be rotated relative to the stator 2 about the central axis J and joined continuously, which can shorten the cycle time of the joining process.

[0107] The conductor retainer 80 is made of an insulating resin component. The conductor retainer 80 is formed by embedding a portion of the return conductors 54 and 55 into an insert. More specifically, the conductor retainer 80 embeds the conductor body portions 54a and 55a and the radial extension portions 54b and 55b of the return conductors 54 and 55, while exposing the connecting terminals 54c and 55c. Thus, the conductor retainer 80 retains the return conductors 54 and 55 of the plurality of conductor connectors 60.

[0108] The conductor holder 80 has a plurality of (five in this embodiment) wall portions 81. The wall portions 81 extend radially and axially. The plurality of wall portions 81 are arranged circumferentially. In the conductor unit 7, two of each of the U-phase connection terminals 54c, 55c, the V-phase connection terminals 54c, 55c, and the W-phase connection terminals 54c, 55c are arranged circumferentially. The wall portions 81 are disposed between the U-phase connection terminal 55c and the V-phase connection terminal 54c, between the V-phase connection terminal 55c and the W-phase connection terminal 54c, and between the W-phase connection terminal 55c and the U-phase connection terminal 54c.

[0109] According to this embodiment, the wall portion 81 of the conductor retainer 80 is disposed between the connection terminals 54c and 55c of the return conductors 54 and 55 of different phases. Therefore, the wall portion 81 can improve the insulation between the connection terminals 54c and 55c of different phases, thereby improving the reliability of the conductor unit 7.

[0110] Figure 9 This is a partial cross-sectional view of motor 1 according to the embodiment. Additionally, Figure 9 The cross-section line passes through the first end 61a and the fourth end 62b of the conductor connector 60.

[0111] Multiple return conductors 54 and 55 are radially arranged between the first end 61a and the third end 62a and the second end 61b and the fourth end 62b. That is, the multiple return conductors 54 and 55 are radially arranged between the first end 61a and the second end 61b. This allows for the concentrated arrangement of the busbars 10, 11, 12, and 13 connected to the first end 61a and the third end 62a, and the return conductors 54 and 55 connected to the second end 61b and the fourth end 62b, both circumferentially and axially, enabling miniaturization of the motor 1. Furthermore, the joints of the busbars 10, 11, 12, and 13 with respect to the first end 61a and the third end 62a, and the joints of the return conductors 54 and 55 with respect to the second end 61b and the fourth end 62b, can be arranged close together circumferentially. Therefore, in processes where the joints are joined (e.g., welding), the travel distance of the joining fixture can be shortened, and the cycle time of the joining process can be reduced.

[0112] The circumferential positions of the multiple return conductors 54 and 55 overlap with the circumferential positions of the first end 61a, the second end 61b, the third end 62a, and the fourth end 62b. Furthermore, the axial positions of the multiple return conductors 54 and 55 overlap with the circumferential positions of the first end 61a, the second end 61b, the third end 62a, and the fourth end 62b. Therefore, the conductor unit 7 can be compactly arranged relative to the coil end 30e.

[0113] <Bus Unit>

[0114] like Figure 4 As shown, busbar unit 5 is disposed on the upper side of stator 2. More specifically, busbar unit 5 is disposed on the upper side of core back 21 and radially outward of coil end 30e. Therefore, busbar unit 5 is radially opposite to coil end 30e. Busbar unit 5 is connected to the first end 61a and the third end 62a of conductor connector 60 extending from coil end 30e.

[0115] Figure 8 This is a 3D view of busbar unit 5. Additionally, Figure 8 In the diagram, the busbar retainer 90 of busbar unit 5 is represented by a double-dotted line.

[0116] Busbar unit 5 has a neutral point busbar 10, multiple phase buses 11, 12, and 13, and a busbar retainer 90. That is, stator 2 has a neutral point busbar 10, multiple phase buses 11, 12, and 13, and a busbar retainer 90. The neutral point busbar 10 is connected to the first end 61a of the first portion 61, and the phase buses 11, 12, and 13 are connected to the third end 62a of the second portion 62 (see reference). Figure 5 ).

[0117] Neutral point busbar 10 and phase busbars 11, 12, and 13 are plate-shaped with the radial direction as the thickness direction. Neutral point busbar 10 and phase busbars 11, 12, and 13 are formed by punching. Neutral point busbar 10 and phase busbars 11, 12, and 13 extend circumferentially.

[0118] like Figure 8 As shown, the neutral point busbar 10 is arranged radially inside the phase busbars 11, 12, and 13. The neutral point busbar 10 has a neutral point busbar body 10a, a plurality of (six in this embodiment) neutral point connection portions 10b, an upper extension portion 10c, and an external connection terminal 10d.

[0119] When viewed axially, the main body 10a of the neutral point busbar extends in an arc shape centered on the central axis J. The radial direction of the main body 10a of the neutral point busbar is taken as the plate thickness direction.

[0120] The upper extension 10c of the neutral point busbar 10 extends upward from the end of the circumferential side θ1 of the main body 10a of the neutral point busbar. Furthermore, an external connection terminal 10d is disposed at the upper end of the upper extension 10c. The external connection terminal 10d extends along a plane orthogonal to the central axis J. An external terminal (not shown) for connection to the inverter is connected to the external connection terminal 10d.

[0121] The neutral point connector 10b protrudes upward from the neutral point busbar body 10a. Multiple neutral point connectors 10b are arranged on the same circumference centered on the central axis J. The neutral point connectors 10b extend vertically with a uniform width. All neutral point connectors 10b have the same shape. Each neutral point connector 10b is connected to a second end portion 64 extending radially outward from the coil end 30e by a joining means such as welding. That is, the neutral point busbar 10 is connected to the second end portion 64 of the conductor connector 60 at the neutral point connector 10b (see reference). Figure 3 ).

[0122] Phase busbars 11, 12, and 13 each have a phase busbar main body 11a, 12a, and 13a, multiple (two in this embodiment) phase connection parts 11b, 12b, and 13b, an upper extension part 11c, 12c, and 13c, and external connection terminals 11d, 12d, and 13d.

[0123] The phase busbar main bodies 11a, 12a, and 13a of each phase busbar 11, 12, and 13 have different shapes. At least a portion of each of the phase busbar main bodies 11a, 12a, and 13a of the three phase busbars 11, 12, and 13 overlaps radially outward or axially relative to the neutral point busbar 10.

[0124] In phase busbars 11, 12, and 13, phase connection portions 11b, 12b, and 13b protrude upwards from the main body portions 11a, 12a, and 13a of the phase busbars. Multiple phase connection portions 11b, 12b, and 13b are arranged on the same circumference centered on the central axis J. Phase connection portions 11b, 12b, and 13b extend vertically with a uniform width. All phase connection portions 11b, 12b, and 13b have identical shapes. Furthermore, phase connection portions 11b, 12b, and 13b have the same shape as the neutral point connection portion 10b. Each phase connection portion 11b, 12b, and 13b is connected to a first end portion 63 extending radially outwards from the coil end 30e by welding or other joining means (see reference). Figure 3 ).

[0125] In this embodiment, the axial positions of all phase connection portions 11b, 12b, 13b of all phase busbars 11, 12, and 13, and the neutral point connection portion 10b overlap each other. The phase connection portions 11b, 12b, 13b, and the neutral point connection portion 10b are connected to the first end 61a (first end portion 63) or the third end 62 (second end portion 64) by welding or other joining means. According to this embodiment, since the axial positions of all phase connection portions 11b, 12b, 13b, and the neutral point connection portion 10b are aligned, the joining of the phase connection portions 11b, 12b, 13b, and the neutral point connection portion 10b can be performed without axially moving the electrode pair used for resistance welding and the joining device used for each joining means. As a result, the joining process can be simplified.

[0126] In this embodiment, all phase connection portions 11b, 12b, 13b of all phase busbars 11, 12, and 13, and the neutral point connection portion 10b, are arranged on the same circumference centered on the central axis J. Therefore, in the joining process between the phase connection portions 11b, 12b, 13b, and the neutral point connection portion 10b and the first end 61a and the third end 62a, the clamping fixture can rotate relative to the stator 2 around the central axis J and perform continuous joining. This shortens the cycle time of the joining process, resulting in a simplified joining process.

[0127] The upper extensions 11c, 12c, and 13c of phase busbars 11, 12, and 13 extend upward from the end of the circumferential side θ1 of the main body 11a, 12a, and 13a of each phase busbar. Furthermore, external connection terminals 11d, 12d, and 13d are disposed at the upper ends of each upper extension 11c, 12c, and 13c. External connection terminal 10d extends along a plane orthogonal to the central axis J. External terminals (not shown) for providing voltage to phases U, V, and W are respectively connected to external connection terminals 11d, 12d, and 13d.

[0128] In this embodiment, the neutral point busbar 10 and the phase busbars 11, 12, and 13 are arranged to overlap radially. Therefore, even if the width of the neutral point busbar 10 and the phase busbars 11, 12, and 13 is increased to increase the cross-sectional area, the radial dimension will not become larger. According to the motor 1 of this embodiment, the cross-sectional area of ​​the neutral point busbar 10 and the phase busbars 11, 12, and 13 can be increased to cope with large currents, and the increase in radial dimension can be suppressed. In particular, according to this embodiment, the neutral point busbar 10 and the phase busbars 11, 12, and 13 are plate-shaped with the radial direction being the plate thickness direction. Therefore, by arranging the neutral point busbar 10 and the phase busbars 11, 12, and 13 to overlap radially, the increase in radial dimension can be effectively suppressed.

[0129] (Busline retainer)

[0130] The busbar retainer 90 is made of an insulating resin component. The busbar retainer 90 is formed by embedding a portion of the neutral point busbar 10 and a plurality of phase busbars 11, 12, 13. Thus, the busbar retainer 90 retains the neutral point busbar 10 and the phase busbars 11, 12, 13.

[0131] The busbar retainer 90 has a retainer body portion 91, a plurality of (four in this embodiment) support portions 92, and a plurality of (five in this embodiment) dividing wall portions 93. The busbar retainer 90 is mounted on the back side 21 of the stator core 20. The busbar retainer 90 is, for example, fixed to the stator core 20. The busbar retainer 90 is fixed to the housing 1a (see reference). Figure 1 ).

[0132] The retaining body 91 is embedded with the neutral point busbar body 10a of the neutral point busbar 10 and the phase busbar bodies 11a, 12a, and 13a of the phase busbars 11, 12, and 13. The retaining body 91 exposes the neutral point connection part 10b and the phase connection parts 11b, 12b, and 13b from its upper end face.

[0133] The support portion 92 extends upward from the main body portion 91 of the retainer. Multiple support portions 92 are respectively embedded in the upper extensions 10c, 11c, 12c, and 13c of the neutral point busbar 10 and the phase busbars 11, 12, and 13. Thus, the support portion 92 supports the upper extensions 10c, 11c, 12c, and 13c.

[0134] The dividing wall portion 93 extends radially and axially. Multiple dividing wall portions 93 are arranged circumferentially. In busbar unit 5, the neutral point connection portion 10b and phase connection portions 11b, 12b, and 13b are alternately arranged in pairs circumferentially. The dividing wall portion 93 is disposed between the neutral point connection portion 10b and the phase connection portions 11b, 12b, and 13b. Therefore, the dividing wall portion 93 can improve insulation between the neutral point connection portion 10b and the second end portion 64 of different phases and the phase connection portions 11b, 12b, 13b and the first end portion 63, thereby improving the reliability of busbar unit 5.

[0135] <Variation Example>

[0136] Figure 10 This is a partial cross-sectional schematic diagram of the modified motor 101.

[0137] Compared with the above embodiments, the main difference of the motor 101 in this modified example is that the conductor retainer part (conductor retainer) 180 and the busbar retainer part (busbar retainer) 190 are composed of a single component (resin retainer 107).

[0138] Similar to the above embodiment, multiple busbars 10, 11, 12, and 13 are arranged on the upper side of the core back 21 of the stator core 20 and radially outward of the coil end 30e. Furthermore, return conductors 54 and 55 are arranged directly above the coil end 30e located on the upper side of the stator core 20.

[0139] The stator 102 of this embodiment includes a resin retainer 107. The resin retainer 107 includes a conductor retainer portion 180 and a busbar retainer portion 190. That is, the stator 102 includes a conductor retainer portion 180 and a busbar retainer portion 190. The conductor retainer portion 180 holds a plurality of return conductors 54, 55. Similarly, the busbar retainer portion 190 holds a plurality of busbars 10, 11, 12, 13.

[0140] The resin retainer 107 is mounted on the back 201 of the stator core 102. The resin retainer 107 is fixed to the stator core 20, for example, in the conductor retainer portion 180. The resin retainer 107 may also be fixed to the housing 1a.

[0141] According to the motor 101 of this modified example, compared with the case where there are components for holding back conductors 54 and 55 and components for holding back busbars 10, 11, 12 and 13 respectively, the number of parts can be reduced and the assembly process can be simplified.

[0142] According to the resin retainer 107 of this modified example, the conductor retainer portion 180, which holds the plurality of return conductors 54, 55, and the busbar retainer portion 190, which holds the plurality of busbars 10, 11, 12, 13, are a single component. Therefore, compared with the case where the conductor retainer portion 180 and the busbar retainer portion 190 are arranged separately, their respective stiffness can be improved, and vibrations applied to the return conductors 54, 55 and the busbars 10, 11, 12, 13 can be suppressed. As a result, the load applied to joints such as welded parts can be reduced, and the reliability of the stator 102 can be improved.

[0143] Furthermore, in this modified example, the case where the conductor holding part 180 and the busbar holding part 190 are composed of a single component has been described. However, as long as the busbar holding part 190 supports the conductor holding part 180, it is possible to achieve a certain degree of suppression of vibrations applied to the return conductors 54 and 55 and the busbars 10, 11, 12, and 13. That is, if the busbar holding part 190 and the conductor holding part 180 are fixed to each other, the busbar holding part 190 and the conductor holding part 180 do not necessarily have to be a single component.

[0144] Various embodiments of the present invention have been described above. However, each structure and combination thereof in each embodiment is an example, and additions, omissions, substitutions, and other modifications to the structure can be made without departing from the spirit of the present invention. Moreover, the present invention is not limited to the embodiments described above. For example, in the above embodiments, the case where motor 1 is a three-phase motor has been described, but motor 1 may also be a five-phase motor or other motors.

[0145] For example, in the above embodiment, the case where the first end 61a of the first portion 61 and the third end 62a of the second portion 62 are arranged radially outward from the coil end 30e, and the second end 61b of the first portion 61 and the fourth end 62b of the second portion 62 are arranged radially inward from the coil end 30e, has been described. However, the radial inward and outward relationships of the first end 61a, the second end 61b, the third end 62a, and the fourth end 62b relative to the coil end 30e can also be reversed from the embodiment. That is, the first end 61a of the first portion 61 and the third end 62a of the second portion 62 can be arranged radially inward from the coil end 30e, and the second end 61b of the first portion 61 and the fourth end 62b of the second portion 62 can be arranged radially outward from the coil end 30e. In this case, the return conductors 54 and 55 are connected to other conductors at their radially outward ends of the coil end 30e. In addition, busbars 10, 11, 12, and 13 are connected to the winding section 30 on the radially inner side of the coil end 30e.

[0146] Symbol Explanation

[0147] 1. 101 Motor; 2. 102 Stator; 3 Rotor; 10 Busbar; 11 Phase Busbar; 20 Stator Core; 50 Conductor; 54, 55 Turnback Conductors; 54c, 55c Connecting Terminals; 60 Conductor Connector; 60A First Conductor Connector; 60B Second Conductor Connector; 61 First Part; 61a First End; 61b Second End; 62 Second Part; 62a Third End; 62b Fourth End; 67, 167 Turnback Part; 80 Conductor Holder; 81 Wall Part; 90 Busbar Holder; 190 Busbar Holder Part; 180 Conductor Holder Part; 167 Turnback Part; J Central Axis; S Groove; s Number of Grooves per Pole; θ1 Circumferential Side; θ2 Circumferential Side.

Claims

1. A motor, comprising: A rotor that can rotate about a central axis; as well as The stator is disposed radially outside the rotor. The stator includes: A stator core, wherein the stator core is provided with a plurality of circumferentially arranged slots; and Multiple conductor connectors, each consisting of multiple conductors connected in series, are inserted into multiple slots. The conductor connector has: The first part is wavyly wound from the first end toward the second end toward one circumferential side; The second part, the second part being wavyly wound from the third end to the fourth end toward one circumferential side; and The reversing section connects the first section and the second section. The second end of the first portion and the fourth end of the second portion protrude axially from the circumferentially different grooves. The plurality of conductors includes a folding conductor that connects the second end of the first portion to the fourth end of the second portion, and constitutes the folding portion. The multiple conductor connectors are classified into multiple phases. When viewed from the axial direction, at least a portion of the folded-back conductors of different phases overlap each other.

2. The motor as claimed in claim 1, wherein, The first end, the second end, the third end, and the fourth end all protrude axially to one side relative to the stator core. The return conductor is radially positioned between the first end and the second end.

3. The motor as claimed in claim 1, wherein, The return conductors of different phases are identical in shape and are arranged staggered in the circumferential direction.

4. The motor as claimed in claim 3, wherein, The folded-back conductors of different phases are arranged in a stepped pattern when viewed radially.

5. The motor as claimed in any one of claims 1 to 4, wherein, The plurality of said conductor connectors include a plurality of said conductor connectors in phase. The in-phase return conductors overlap radially.

6. The motor as claimed in claim 5, wherein, The foldback conductor has the following characteristics: A conductor body portion, the conductor body portion extending circumferentially; A radial extension portion, which extends radially from both ends of the conductor body portion; as well as A connecting terminal that extends axially from the end of the radial extension. The in-phase return conductors overlap radially in the conductor body.

7. The motor as claimed in claim 6, wherein, The folding conductor is plate-shaped, with the axial direction serving as the plate thickness direction at the main body and the radial extension, and the radial direction serving as the plate thickness direction at the connecting terminal.

8. The motor as claimed in claim 5, wherein, Set the number of slots per pole to s. In the two conductor connections of the same phase that pass through adjacent cuts, One of the conductor connectors extends at the return conductor between the slots spaced s-1 apart. The other conductor connector extends between the slots spaced s+1 apart at the return conductor and passes through the radial side of the return conductor of one of the conductor connectors.

9. The motor as claimed in any one of claims 1 to 4, wherein, The stator has a conductor retainer that holds the folded-back conductors of the plurality of conductor connectors. The multiple conductor connectors are classified into multiple phases. The two ends of the return conductor are provided with connection terminals for connecting the return conductor to other conductors. The conductor retainer has a wall portion between the connecting terminals of the return conductors of different phases.

10. The motor as claimed in claim 9, wherein, The stator includes: A phase busbar, wherein the phase busbar is connected to the first end; Neutral point busbar, the neutral point busbar being connected to the third end; and A busbar retainer that retains the neutral point busbar and the phase busbars. The busbar retainer supports the conductor retainer.

11. The motor as claimed in claim 10, wherein, The busbar retainer and the conductor retainer are a single component.

12. A motor, comprising: A rotor that can rotate about a central axis; as well as The stator is disposed radially outside the rotor. The stator includes: A stator core, wherein the stator core is provided with a plurality of circumferentially arranged slots; and Multiple conductor connectors, each consisting of multiple conductors connected in series, are inserted into multiple slots. The conductor connector has: The first part is wavyly wound from the first end toward the second end toward one circumferential side; The second part, the second part being wavyly wound from the third end to the fourth end toward one circumferential side; and The reversing section connects the first section and the second section. The second end of the first portion and the fourth end of the second portion protrude axially from the circumferentially different grooves. The plurality of conductors includes a folding conductor that connects the second end of the first portion to the fourth end of the second portion, and constitutes the folding portion. The stator has a conductor retainer that holds the folded-back conductors of the plurality of conductor connectors. The multiple conductor connectors are classified into multiple phases. The two ends of the return conductor are provided with connection terminals for connecting the return conductor to other conductors. The conductor retainer has a wall portion between the connecting terminals of the return conductors of different phases.

13. The motor as claimed in claim 12, wherein, The first end, the second end, the third end, and the fourth end all protrude axially to one side relative to the stator core. The return conductor is radially positioned between the first end and the second end.

14. The motor as claimed in claim 12, wherein, The return conductors of different phases are identical in shape and are arranged staggered in the circumferential direction.

15. The motor as claimed in claim 14, wherein, The folded-back conductors of different phases are arranged in a stepped pattern when viewed radially.

16. The motor as claimed in any one of claims 12 to 15, wherein, The plurality of said conductor connectors include a plurality of said conductor connectors in phase. The in-phase return conductors overlap radially.

17. The motor of claim 16, wherein, The foldback conductor has the following characteristics: A conductor body portion, the conductor body portion extending circumferentially; A radial extension portion, which extends radially from both ends of the conductor body portion; as well as A connecting terminal that extends axially from the end of the radial extension. The in-phase return conductors overlap radially in the conductor body.

18. The motor of claim 17, wherein, The folding conductor is plate-shaped, with the axial direction serving as the plate thickness direction at the main body and the radial extension, and the radial direction serving as the plate thickness direction at the connecting terminal.

19. The motor of claim 16, wherein, Set the number of slots per pole to s. In the two conductor connections of the same phase that pass through adjacent cuts, One of the conductor connectors extends at the return conductor between the slots spaced s-1 apart. The other conductor connector extends between the slots spaced s+1 apart at the return conductor and passes through the radial side of the return conductor of one of the conductor connectors.

20. The motor of claim 12, wherein, The stator includes: A phase busbar, wherein the phase busbar is connected to the first end; Neutral point busbar, the neutral point busbar being connected to the third end; and A busbar retainer that retains the neutral point busbar and the phase busbars. The busbar retainer supports the conductor retainer.

21. The motor as claimed in claim 20, wherein, The busbar retainer and the conductor retainer are a single component.

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