motor

Abstract

A motor of the present application includes: a rotor rotatable about a center axis; and a stator disposed radially outward of the rotor. The stator has: a winding portion having a plurality of conductor connection bodies obtained by connecting a plurality of conductors in series; and a stator core provided with a plurality of slots through which the conductor connection bodies pass. The winding portion has a neutral point portion located on an axial side of the stator core and electrically connecting end portions of three conductor connection bodies. The neutral point portion has two connection portions for electrically connecting two of the end portions of the three conductor connection bodies in different combinations.

Description

TECHNICAL FIELD

[0001] The present application relates to a motor. BACKGROUND

[0002] In a motor for an electric vehicle, research is being conducted on a winding structure using a segmented coil for the purpose of higher efficiency and the like. In Patent Literature 1, a structure is disclosed in which flat wires of three-phase segmented coils are concentratedly connected at one place as a neutral point.

[0003] [Prior Art Documents]

[0004] [Patent Literature]

[0005] Patent Literature 1: International Publication No. 2013 / 042478

[0006] In the conventional structure, since the flat wires of three phases are extended in the circumferential direction to be concentratedly connected at one place, the connection portion of the leading end becomes a cantilever structure, and there is a problem that the load applied on the connection portion becomes large. SUMMARY

[0007] In view of the above, one object of the present application is to provide a motor having a neutral point portion excellent in strength against vibration.

[0008] One embodiment of the motor of the present application includes a rotor rotatable about a center axis, and a stator disposed radially outward of the rotor. The stator has a winding portion having a plurality of conductor connection bodies obtained by connecting a plurality of conductors in series, and a stator core provided with a plurality of slots through which the conductor connection bodies pass. The winding portion has a neutral point portion located on an axial side of the stator core and electrically connecting end portions of three of the conductor connection bodies. The neutral point portion has two connection portions electrically connecting different combinations of two of the end portions of the three conductor connection bodies.

[0009] According to one embodiment of the present application, it is possible to provide a motor having a neutral point portion excellent in strength against vibration. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a perspective view of a motor of one embodiment.

[0011] Figure 2 is a cross-sectional view of a motor of one embodiment.

[0012] Figure 3 is a schematic view showing a circuit constituted by a winding portion of one embodiment.

[0013] Figure 4 is a schematic view showing a winding structure of a conductor connection body of one embodiment.

[0014] Figure 5 FIG. 1 is a perspective view of a neutral point portion according to an embodiment.

[0015] Figure 6 FIG. 2 is a perspective view of two neutral point portions according to an embodiment.

[0016] Figure 7 FIG. 3 is a perspective view of a neutral point portion according to a modification that can be employed in the above-described embodiments.

[0017] (Symbol Explanation)

[0018] 1... motor

[0019] 2... stator

[0020] 3... rotor

[0021] 7... enamel film (first film)

[0022] 8... film portion (second film)

[0023] 10, 110... neutral point portion

[0024] 10A... first neutral point portion

[0025] 10B... second neutral point portion

[0026] 11, 111... connecting portion (connecting portion)

[0027] 12, 112... second connecting portion (connecting portion)

[0028] 20... stator core

[0029] 30... winding portion

[0030] 30e, 30f... coil edge end

[0031] 50... conductor

[0032] 59... circumferentially extending portion

[0033] 60, 160... conductor connecting body

[0034] 60U... U-phase conductor connecting body (first-phase conductor connecting body)

[0035] 60V... V-phase conductor connecting body (second-phase conductor connecting body)

[0036] 60W... W-phase conductor connecting body (third-phase conductor connecting body)

[0037] 63... terminal portion

[0038] 64 … second end portion (end portion)

[0039] 159U … first circumferential extension

[0040] 159V … second circumferential extension

[0041] J … central axis

[0042] S … slot DETAILED DESCRIPTION

[0043] The Z-axis direction shown appropriately in the drawings is an up-down direction in which the positive side is the "upper side" and the negative side is the "lower side". The central axis J shown appropriately in the drawings is an imaginary line parallel to the Z-axis direction and extending in the up-down direction. In the following description, the axial direction of the central axis J, that is, the direction parallel to the up-down direction, is sometimes simply referred to as the "axial direction", the upper side is referred to as the "axial direction one side", and the lower side is referred to as the "axial direction other side". In addition, the radial direction centered on the central axis J is sometimes simply referred to as the "radial direction". Furthermore, the circumferential direction centered on the central axis J is sometimes simply referred to as the "circumferential direction", the counterclockwise direction as viewed from the upper side is referred to as the "circumferential direction one side", and the clockwise direction as viewed from the upper side is referred to as the "circumferential direction other side".

[0044] In addition, the up-down direction, the upper side, and the lower side are names used only for explaining the arrangement relationship and the like of each portion, and the actual arrangement relationship and the like can also be an arrangement relationship and the like other than those shown by these names. Furthermore, the directions described as the axial direction one side and the axial direction other side can reproduce the effects of the embodiments even if they are replaced with each other. Similarly, the directions described as the circumferential direction one side θ1 and the circumferential direction other side θ2 can reproduce the effects of the embodiments even if they are replaced with each other.

[0045] <MOTOR>

[0046] Figure 1 is a perspective view of the motor 1 of the present embodiment. Figure 2 is a cross-sectional view of the motor 1.

[0047] As shown in Figure 1 , the motor 1 of the present embodiment is an internal rotor type motor. In addition, the motor 1 of the present embodiment is a three-phase alternating current motor. The center of the motor 1 is the central axis J.

[0048] The motor 1 includes a rotor 3 and a stator 2. In addition, the motor 1 can also have a bus bar unit, which is omitted from illustration. In this case, the bus bar unit is arranged on the upper side of the stator 2 and connected to the stator 2.

[0049] <ROTOR>

[0050] As shown in Figure 2As shown, the rotor 3 is disposed radially inside the annular stator 2. That is, the rotor 3 opposes the stator 2 in the radial direction. The rotor 3 has a shaft 3a, rotor magnets 3b, and a rotor core 3c. The rotor 3 is rotatable about the center axis J.

[0051] The shaft 3a extends in the axial direction along the center axis J. The shaft 3a is, for example, cylindrical and extends in the axial direction about the center axis J. The shaft 3a is rotatably supported by bearings, which are not shown.

[0052] The rotor core 3c is cylindrical and extends in the axial direction. The rotor core 3c is constructed by laminating electromagnetic steel sheets. The inner circumferential surface of the rotor core 3c is fixed to the outer circumferential surface of the shaft 3a. A holding hole 3h into which the rotor magnet 3b is inserted and fixed is provided in the rotor core 3c.

[0053] The rotor magnet 3b opposes the stator 2 in the radial direction. The rotor magnet 3b is held in a state of being buried in the rotor core 3c. The rotor magnet 3b of the present embodiment is an eight-pole (eight magnetic pole). The number of magnetic poles of the rotor 3 is not limited to the present embodiment. In addition, the rotor magnet 3b can also be a ring magnet or another type of magnet in a circular ring shape.

[0054] < Stator >

[0055] The stator 2 opposes the rotor 3 across a gap in the radial direction. In the present 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.

[0056] The stator core 20 is annular about the center axis J. The stator core 20 is constructed by a plurality of electromagnetic steel sheets laminated in the axial direction. The stator core 20 has a cylindrical core back portion 21 about the center axis J, and a plurality of pole tooth portions 22 extending toward the radially inner side from the core back portion 21.

[0057] The plurality of pole tooth portions 22 are arranged at equal intervals in the circumferential direction. An umbrella portion 22a is provided at the radially inner side of the front end portion of the pole tooth portion 22. The umbrella portion 22a protrudes to both sides in the circumferential direction with respect to the pole tooth portion 22. That is, the circumferential dimension of the umbrella portion 22a is larger than the circumferential dimension of the pole tooth portion 22. The radially inner side surface of the umbrella portion 22a opposes the outer circumferential surface of the rotor 3 across a gap in the radial direction.

[0058] The winding portion 30 is mounted on the pole tooth portion 22. Adjacent pole tooth portions 22 in the circumferential direction are provided with a slot S therebetween. That is, a plurality of slots S are arranged in the circumferential direction on the stator core 20.

[0059] The conductor 50 of the winding portion 30 is housed in the slot S. In addition, one insulating paper 6 is disposed in the slot S. The insulating paper 6 ensures insulation between the winding portion 30 and the stator core 20 in the slot S.

[0060] A plurality of layers are arranged in the slot S in the radial direction. A conductor 50 is arranged on each layer in the slot. The plurality of conductors 50 are arranged in the slot S in the radial direction.

[0061] The slot S has an opening portion 29h that opens to the inner side in the radial direction. The opening portion 29h is located between the umbrella-shaped portions 22a of the adjacent tooth portions 22 at the front end. The width dimension of the opening portion 29h in the circumferential direction is smaller than the dimension of the conductor 50 in the circumferential direction. Therefore, the conductor 50 is difficult to pass through the opening portion 29h, and it is possible to suppress the conductor 50 from coming off the stator core 20.

[0062] In the present embodiment, the stator core 20 has forty-eight tooth portions 22. That is, the stator 2 of the present embodiment is a forty-eight slot. In addition, the number of slots of the stator 2 is appropriately set in accordance with the number of poles of the rotor magnet 3b and the winding method of the winding portion 30.

[0063] Figure 3 is a schematic view showing the circuit constituted by the winding portion 30 of the present embodiment.

[0064] The winding portion 30 of the present embodiment has a plurality of (twelve in the present embodiment) conductor connection bodies 60, and constitutes a segmented coil. The twelve conductor connection bodies 60 are classified into four U-phase conductor connection bodies (first-phase conductor connection bodies) 60U, four V-phase conductor connection bodies (second-phase conductor connection bodies) 60V, and four W-phase conductor connection bodies (third-phase conductor connection bodies) 60W.

[0065] Two of the four conductor connection bodies 60 of the same phase pass through slots S adjacent to each other and are attached to the stator core 20. In the present specification, the two conductor connection bodies 60 that pass through slots S adjacent to each other are referred to as a connection body pair 69. In addition, in the following description, in the case where the two conductor connection bodies 60 that constitute the connection body pair 69 are distinguished from each other, one is referred to as a first conductor connection body 60A and the other is referred to as a second conductor connection body 60B.

[0066] The conductor connection body 60 has a first end portion 63 and a second end portion (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, and constitutes a coil of each phase. The conductor connection body 60 is connected to the bus bar unit 5 at the first end portion 63 and the second end portion 64.

[0067] The second end portions 64 of the U-phase conductor connectors 60U, the V-phase conductor connectors 60V, and the W-phase conductor connectors 60W are connected to each other to constitute the neutral point portion 10. That is, the winding portion 30 has the neutral point portion 10 to which the second end portions 64 of the three conductor connectors 60 are electrically connected.

[0068] The neutral point portion 10 is a neutral point of a three-phase circuit of a Y-connection. By providing the neutral point portion 10, the end portions of the U-phase conductor connectors 60U, the V-phase conductor connectors 60V, and the W-phase conductor connectors 60W form Y-connections. In the present embodiment, four Y-connections corresponding to the four conductor connectors 60 of each phase are constituted, and the respective Y-connections are connected in parallel. That is, the plurality of conductor connectors 60 form 4Y-connections.

[0069] The first end portions 63 of the four U-phase conductor connectors 60U are connected to one U-phase bus bar 70. The first end portions 63 of the four V-phase conductor connectors 60V are connected to one V-phase bus bar 80. The first end portions 63 of the four W-phase conductor connectors 60W are connected to one W-phase bus bar 90. In the U-phase bus bar 70, the V-phase bus bar 80, and the W-phase bus bar 90, alternating currents flowing through phases that are staggered every 120° are respectively passed.

[0070] According to the present embodiment, four conductor connectors 60 of the same phase are connected to one phase bus bar 70, 80, 90. That is, the winding portion 30 of the present embodiment includes four conductor connectors 60 in each of the three phases, and the conductor connectors 60 of each phase are connected in parallel to each other by the phase bus bar 70, 80, 90.

[0071] In addition, in the present embodiment, a case where the winding portion 30 has four conductor connectors 60 of the same phase is described. However, if the winding portion 30 has at least two conductor connectors 60 and they constitute a connector pair 69 that passes through circumferentially adjacent slots S, the same winding structure as the present embodiment can be adopted. Therefore, the plurality of conductor connectors 60 can be connected in 2XM Y-connections where M is a natural number (in the present embodiment, M = 2).

[0072] Figure 4 is a schematic view showing a winding structure of two conductor connectors 60 that constitute a connector pair 69.

[0073] As Figure 4As shown, the conductor connecting body 60 is configured by connecting a plurality of conductors 50 in series. Each of the conductors 50 is configured by bending a flat wire. Therefore, as compared with a case where a round wire is used, the space factor of the conductor 50 in the slot S can be improved. In the present specification, the "flat wire" refers to a wire having a quadrangular or substantially quadrangular cross-sectional shape. In the present specification, the "substantially quadrangular" includes a rounded quadrangle in which the corners of the quadrangle are rounded. Although not shown in the drawings, in the present embodiment, the conductor 50 has a glaze film on the surface.

[0074] The plurality of conductors 50 configuring the conductor connecting body 60 are classified into a terminal conductor 51, a hairpin conductor 52, a first return conductor 54, and a second return conductor 55.

[0075] Each of the conductors 50 has at least a straight portion 50a extending in a straight line shape along the axial direction (Z direction) and a connecting portion 50j at the end portion on the lower side (the other side in the axial direction). The straight portion 50a passes through the slot S. That is, the straight portion 50a of the conductor connecting body 60 is housed in the slot S. The region of the conductor connecting body 60 other than the straight portion 50a projects to the upper side and the lower side of the stator core 20. The portions projecting from the upper side and the lower side of the stator core 20 configure the coil end 30e (see FIG. 2) of the stator core 20. Figure 1 ).

[0076] 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 method such as welding. The connecting portion 50j is bent in the circumferential direction after the conductor 50 is mounted to the stator core 20 and is welded to the connecting portion 50j of another conductor 50. In the conductor 50 before being mounted to the stator core 20, the connecting portion 50j is in a straight line shape continuous with the straight portion 50a. The conductor 50 is mounted to the stator core 20 by inserting the connecting portion 50j and the straight portion 50a into the slot S from the upper side (one side in the axial direction) of the stator core 20. The connecting portion 50j of the conductor 50 is bent in the circumferential direction and is welded to another connecting portion 50j, whereby the conductor 50 is prevented from coming off the stator core 20 in the axial direction.

[0077] The stator 2 of the present embodiment can be assembled by inserting a plurality of conductors 50 from the upper side with respect to the slot S of the stator core 20 and joining on the lower side. Therefore, a complicated assembly process is not required, and the assembly process can be simplified.

[0078] Next, the various conductors 50 will be described.

[0079] Each of the terminal conductors 51 has one terminal portion 63, 64, one straight portion 50a, and one connecting portion 50j. In the terminal conductors 51, the terminal portions 63 and 64 extend obliquely to one circumferential direction θ1 from the upper end of the straight portion 50a toward the upper side, and the connecting portion 50j extends obliquely to the other circumferential direction θ2 from the lower end of the straight portion 50a toward the lower side. That is, in the terminal conductors 51, the directions in which the terminal portions 63 and 64 and the connecting portion 50j extend relative to the straight portion 50a are opposite to those in the circumferential direction.

[0080] Two end portions 63 and 64 are respectively provided at both ends of the conductor connector 60. One of the two end portions 63 and 64 is a first end portion 63, and the other is a second end portion 64. Figure 3 As shown, the first end portion 63 is connected to phase busbars 70, 80, and 90. The second end portion 64 is connected to the second end portions 64 of other phases to form the neutral point portion 10. Furthermore, regarding the structure of the second end portion 64, [the following is a description of its structure]. Figure 5 This will be explained in detail later.

[0081] like Figure 4 As shown, the hairpin conductor 52 has two straight portions 50a, two connecting portions 50j, and one bridging portion 50d. The bridging portion 50d is disposed at the upper end of the hairpin conductor 52. The bridging portion 50d connects the two straight portions 50a to each other. That is, in the hairpin conductor 52, the two straight portions 50a are connected to each other via the bridging portion 50d. In the hairpin conductor 52, the two connecting portions 50j are respectively connected to the lower ends of different straight portions 50a. A plurality of bridging portions 50d protrude from the end face of the upper side (axial side) of the stator core 20. That is, a plurality of conductors 50 include conductors having bridging portions 50d connecting the slots S on the upper side of the stator core 20.

[0082] In the hairpin conductor 52, the two straight sections 50a are arranged relative to each other with a number of slots per pole s. Here, the number of slots per pole s refers to the number of slots S of the stator 2 disposed between one magnetic pole of the rotor 3 in the combination of the rotor 3 and the stator 2. The number of slots per pole s is calculated by (total number of slots of the stator 2) / (number of magnetic poles of the rotor 3). In this embodiment, since the number of magnetic poles of the rotor 3 is 8 and the number of slots of the stator 2 is 48, the number of slots per pole s is 6. In the hairpin conductor 52, the two straight sections 50a are separated from each other by six slots in the circumferential direction.

[0083] In the hairpin conductor 52, the bending directions of the two connecting portions 50j are opposite to each other in the circumferential direction. One of the two connecting portions 50j located on one side of the circumferential direction θ1 extends from the lower end of the straight portion 50a to the other side of the circumferential direction θ2, and the other side located on the other side of the circumferential direction θ2 extends from the lower end of the straight portion 50a to one side of the circumferential direction θ1.

[0084] The first-turn-back conductor 54 has two straight portions 50a, two connecting portions 50j, and a first-turn-back portion (turn-back portion) 50f. Similarly, the second-turn-back conductor 55 has two straight portions 50a, two connecting portions 50j, and a second-turn-back portion (turn-back portion) 50g. The first-turn-back portion 50f and the second-turn-back portion 50g are respectively provided at the upper end portions of the first-turn-back conductor 54 or the second-turn-back conductor 55.

[0085] The first-turn-back portion 50f and the second-turn-back portion 50g connect the two straight portions 50a to each other. That is, in the first-turn-back conductor 54 and the second-turn-back conductor 55, the two straight portions 50a are connected to each other via the first-turn-back portion 50f or the second-turn-back portion 50g, respectively.

[0086] In the first-turn-back conductor 54 and the second-turn-back conductor 55, the two connecting portions 50j are bent toward the circumferential side θ1. That is, in the first-turn-back conductor 54 and the second-turn-back conductor 55, the two connecting portions 50j extend from the lower end of the straight portion 50a toward the circumferential side θ1, respectively.

[0087] In the first-turn-back conductor 54 and the second-turn-back conductor 55, the two straight portions 50a are different in distance from each other. In the first-turn-back conductor 54, the two straight portions 50a are arranged at every s+1 pole slots (7 slots in the present embodiment) in the circumferential direction. On the other hand, in the second-turn-back conductor 55, the two straight portions 50a are arranged at every s-1 pole slots (five slots in the present embodiment) in the circumferential direction. Therefore, the first-turn-back portion 50f is larger in circumferential span than the second-turn-back portion 50g by two slots. One first-turn-back conductor 54 is provided on the first conductor connecting body 60A. On the other hand, one second-turn-back conductor 55 is provided on the second conductor connecting body 60B.

[0088] Next, the winding structure of the first conductor connecting body 60A and the second conductor connecting body 60B will be described.

[0089] In the first conductor connecting body 60A, the two end-use conductors 51 are respectively provided at both ends of the first conductor connecting body 60A, and the first-turn-back conductor 54 is provided at substantially the middle. The first conductor connecting body 60A is wave-wound at every six slots toward the other circumferential side θ2 between the first end portion 63 and the first-turn-back portion 50f. In addition, the first conductor connecting body 60A is wave-wound at every six slots toward the circumferential side θ1 between the first-turn-back portion 50f and the second end portion 64.

[0090] Here, in the first conductor connector 60A, the region between the first end portion 63 and the first fold-back portion 50f that is wavy inwards to the other side θ2 is called the first portion 61. Furthermore, in the first conductor connector 60A, the region between the first fold-back portion 50f and the second end portion 64 that is wavy inwards to one side θ1 is called the second portion 62. That is, the first conductor connector 60A has: a first end portion 63; a first portion 61 wavy inwards to the other side θ2 from the first end portion 63; a first fold-back portion 50f connected to the end of the first portion 61 on the other side θ2; a second portion 62 wavy inwards to the first fold-back portion 50f on the other side θ1; and a second end portion 64 connected to the end of the second portion 62 on the other side θ1.

[0091] In the second conductor connector 60B, two end conductors 51 are respectively disposed at the ends of both ends of the second conductor connector 60B. The second conductor connector 60B, with a second return conductor 55 disposed approximately in the middle, is wavy wound every six slots from the first end portion 63 to the second return portion 50g (first part 61) toward the other side circumferentially θ2. In addition, the second conductor connector 60B is wavy wound every six slots from the second return portion 50g to the second end portion 64 (second part 62) toward the other side circumferentially θ1. That is, the second conductor connector 60B has: a first end portion 63; a first portion 61 which is wavyly wound from the first end portion 63 toward the other side θ2 in the circumferential direction; a second fold-back portion 50g which is connected to the end of the first portion 61 on the other side θ2 in the circumferential direction; a second portion 62 which is wavyly wound from the second fold-back portion 50g toward one side θ1 in the circumferential direction; and a second end portion 64 which is connected to the end of the second portion 62 on the other side θ1 in the circumferential direction.

[0092] In this embodiment, the conductor connector 60 is wavy-wound in the first portion 61 and the second portion 62 at a number of slots per pole, s. That is, the conductor connector 60 is mounted on the stator core 20 in a full-pitch winding manner. Therefore, according to this embodiment, all the multiple conductors 50 arranged in the same slot S are part of the conductor connector 60 of the same phase. Therefore, according to this embodiment, it is not necessary to insulate conductor connectors 60 of different phases in one slot S, and insulation is easily ensured.

[0093] like Figure 1 As shown, in this embodiment, the winding portion 30 has a first end portion 63, a second end portion 64, a bridging portion 50d, and fold-back portions 50f and 50g. The first end portion 63, the second end portion 64, the bridging portion 50d, and the fold-back portions 50f and 50g form a coil edge 30e on the upper side of the stator core 20. On the other hand, the connecting portion 50j forms a coil edge 30f on the lower side of the stator core 20.

[0094] The end portions 63, 64 are arranged at the innermost circumference of the coil end 30e. That is, the end portions 63, 64 are located radially inward of the plurality of crossover portions 50d. On the other hand, the return portions 50f, 50g are arranged at the outermost circumference of the coil end 30e. That is, the return portions 50f, 50g are arranged radially outward of the plurality of crossover portions 50d.

[0095] The first end portion 63 extends upward (axial one side) from the stator core 20, and is connected to the phase bus bar 70, 80, 90 omitted in the middle. Figure 1 On the other hand, the second end portion 64 constitutes the neutral point portion 10. The end portions 63, 64 extend toward the upper side of the stator core 20. Therefore, the neutral point portion 10 is located on the upper side of the stator core 20.

[0096] Figure 5 is a perspective view of the neutral point portion 10 of the present embodiment.

[0097] The neutral point portion 10 is configured such that the second end portions 64 of the U-phase conductor connecting body 60U, the V-phase conductor connecting body 60V, and the W-phase conductor connecting body 60W are connected to each other. In the present embodiment, the base ends of the second end portion 64U of the U-phase, the second end portion 64V of the V-phase, and the second end portion 64W of the W-phase, which constitute the neutral point portion 10, are arranged in order toward the circumferential other side θ2.

[0098] The three second end portions 64 that constitute the neutral point portion 10 each have an inclined portion 64a and a bent portion 64b. The inclined portion 64a is connected to the upper end of the straight portion 50a. The inclined portion 64a of the second end portion 64 is inclined toward the circumferential one side θ1 as it goes from the upper end of the straight portion 50a toward the upper side. The bent portion 64b of the second end portion 64 is connected to the upper end of the inclined portion 64a. The bent portion 64b is bent into a hairpin shape from the circumferential one side θ1 toward the circumferential other side. In addition, the bent portion 64b extends from the boundary portion with the bent portion 64b toward the radially outer side.

[0099] As described above, the neutral point portion 10 is configured such that the second end portions 64 of the U-phase conductor connecting body 60U, the V-phase conductor connecting body 60V, and the W-phase conductor connecting body 60W are connected to each other. Figure 1As shown, the second end portion 64 of one conductor connecting body 60 is adjacent to the first end portion 63 of another conductor connecting body 60 or the second end portion 64 of another conductor connecting body 60 in the circumferential direction. The first end portion 63 and the second end portion 64 have the same inclined portion 63a inclined to the circumferential side θ1 as the upper end portion of the straight portion 50a is directed upward. The inclined directions of all the inclined portions 63a, 64a of the first end portion 63 and the second end portion 64 are consistent with each other. Thus, interference of the first end portion 63 and the second end portion 64 is suppressed. In addition, a part of the plurality of first end portions 63 and second end portions 64 is adjacent to the crossover portion 50d of another conductor connecting body 60 in the circumferential direction. The crossover portion 50d is inclined to the circumferential side θ1 as the upper end portion of the straight portion 50a is directed upward, like the inclined portions 63a, 64a. That is, the inclined directions of the inclined portions 63a, 64a are consistent with the inclined direction of the crossover portion 50d. Therefore, interference of the first end portion 63 and the second end portion 64 with the crossover portion 50d can be suppressed.

[0100] The second end portion 64U for the U phase of the three second end portions 64 constituting the neutral point portion 10 has a circumferential extension 59. In addition, the second end portions 64V, 64W for the V phase and the W phase of the three second end portions 64 have terminal portions 58V, 58W. The circumferential extension 59 and the terminal portions 58V, 58W extend from the bent portion 64b to the circumferential other side θ2, respectively.

[0101] The terminal portions 58V, 58W are arranged in the circumferential direction. The circumferential extension 59 passes above the terminal portions 58V, 58W and contacts the terminal portions 58V, 58W, respectively. The circumferential extension 59 is connected to the terminal portions 58V, 58W, respectively. The circumferential extension 59 and the terminal portion 58V constitute the first connecting portion (connecting portion) 11. In addition, the circumferential extension 59 and the terminal portion 58W constitute the second connecting portion (connecting portion) 12. That is, the second end portion 64V of the V phase conductor connecting body 60V is connected to the circumferential extension 59 to constitute the first connecting portion 11, and the second end portion 64W of the W phase conductor connecting body 60W is connected to the circumferential extension 59 to constitute the second connecting portion 12.

[0102] The two connecting portions 11, 12 are connected by welding, respectively. In the case where resistance welding is employed as the welding method, the welding is performed by sandwiching the circumferential extension 59 and the terminal portions 58V, 58W from above and below with an electrode and flowing a current therethrough. In addition, as described later, in the connecting portions 11, 12, the second end portions 64 to be connected are removed from the enamel coating film between them.

[0103] According to this embodiment, a neutral point portion 10 is provided by directly connecting the second end portions 64 of the three conductor connectors 60 to each other, thereby forming a three-phase circuit. According to this embodiment, compared with the case where the neutral point is formed by connecting the end portions of the conductor connectors to the busbar, the number of parts can be reduced.

[0104] According to this embodiment, the neutral point portion 10 has two connecting portions 11 and 12, which are used for two connections in different combinations of the second end portions 64 of the three conductor connectors 60. Therefore, the neutral point portion 10 has two connecting portions 11 and 12 arranged circumferentially. Thus, the neutral point portion 10 is configured as a gate shape extending from the winding portion 30. This improves the rigidity of the neutral point portion 10. Even when vibration is applied to the neutral point portion 10, it is difficult for the neutral point portion 10 to resonate, reducing the stress applied to the connecting portions 11 and 12 of the neutral point portion 10. Therefore, according to this embodiment, the connecting portions 11 and 12 connected to the neutral point portion 10 are less prone to damage.

[0105] According to this embodiment, the connecting portions 11 and 12 of the neutral point portion 10 are connected to two second end portions 64. That is, according to this embodiment, it is not necessary to join more than three second end portions 64 at the connecting portions 11 and 12. Therefore, when the connecting portions 11 and 12 are formed by welding methods such as resistance welding, welding can be performed stably.

[0106] like Figure 1 As shown, the winding section 30 of this embodiment has a plurality of (four in this embodiment) neutral point sections 10. The four neutral point sections 10 are divided into two groups: a first group G1 and a second group G2. The two neutral point sections 10 of each group G1 and G2 are arranged radially relative to each other. That is, according to this embodiment, at least two neutral point sections 10 are arranged radially.

[0107] According to this embodiment, by arranging a plurality of neutral point portions 10 radially, the connecting portions 11 and 12 of each neutral point portion 10 can be arranged radially. Therefore, in the process of connecting the second end portions 64 of the connecting portions 11 and 12 to each other, the travel distance of the connecting fixture can be shortened, resulting in a shorter production cycle time required for the connecting process. Furthermore, compared to the case where a plurality of neutral point portions 10 are stacked axially, the axial protrusion of the neutral point portions 10 relative to the coil edge 30e can be suppressed, enabling miniaturization of the motor 1.

[0108] Figure 6is a perspective view of two neutral point portions 10 of the first group G1 (or the second group G2). Two U-phase conductor connection bodies 60U connected to the two neutral point portions 10 arranged in the radial direction pass through grooves S adjacent in the circumferential direction. In addition, two V-phase conductor connection bodies 60V connected to the two neutral point portions 10 arranged in the radial direction pass through grooves S adjacent in the circumferential direction. Further, two W-phase conductor connection bodies 60W connected to the two neutral point portions 10 arranged in the radial direction pass through grooves S adjacent in the circumferential direction. In this way, the conductor connection bodies 60 of the same phase connected to the two neutral point portions 10 arranged in the radial direction constitute a connection body pair 69 by passing through grooves S adjacent in the circumferential direction to each other.

[0109] Here, of the two neutral point portions 10 arranged in the radial direction, one located on the radially outer side is referred to as a first neutral point portion 10A, and the other located on the radially inner side is referred to as a second neutral point portion 10B. The length in the radial direction of the bent portion 64b of the first neutral point portion 10A is longer than the length in the radial direction of the bent portion 64b of the second neutral point portion 10B.

[0110] The second end portion 64 extends from the radially inner end of the coil end 30e to the upper side and radially outer side of the coil end 30e to be connected to the neutral point portion 10. Therefore, the second end portion 64 connected to the first neutral point portion 10A extends from the radially inner side to the radially outer side of the second neutral point portion 10B. The second end portion 64 of the conductor connection body 60 connected to the first neutral point portion 10A passes through the lower side or the upper side of the second neutral point portion 10B at the bent portion 64b.

[0111] According to the present embodiment, the second end portion 64 connected to the first neutral point portion 10A is arranged in the axial direction so as to overlap the second neutral point portion 10B. The neutral point portions 10 hardly have current flowing therethrough even if they contact each other. Therefore, the second end portion 64 connected to the first neutral point portion 10A and the second neutral point portion 10B can be arranged close to each other in the axial direction, and the space in which the two neutral point portions 10 are arranged can be downsized in the axial direction.

[0112] In addition, in the present embodiment, the case where the second end portion 64 extends from the radially inner end of the coil end 30e is described. However, the second end portion 64 can extend from the radially outer end of the coil end 30e. That is, the second end portion 64 can extend from the end of one radial side of the coil end 30e to the upper side and the other radial side of the coil end 30e to be connected to the neutral point portion 10. Further, in this case, of the two neutral point portions arranged in the radial direction, the second end portion 64 of the conductor connection body 60 connected to the neutral point portion 10 on the other radial side can pass through the axial side or the other axial side of the neutral point portion on the one radial side.

[0113] As Figure 4As shown, the surface of the conductor 50 is covered with a glaze film (first film) 7 as an insulating covering layer. The surface of the conductor 50 is exposed from the glaze film 7 at the connection portions 11, 12. Further, a conductor 50 film covering portion (second film) 8 covers from above the connection portions 11, 12. Thus, the portion where the surface is exposed from the glaze film 7 is covered with the insulating film portion 8. According to the present embodiment, the conductors 50 can be electrically connected to each other at the second end portions 64, and the reliability of insulation from other conductors 50 can be improved.

[0114] In the present embodiment, the plurality of neutral point portions 10 arranged in the radial direction are covered with one film portion 8. According to the present embodiment, since the plurality of neutral point portions 10 are arranged in the radial direction, they can be collectively covered to form the film portion 8, and the film process can be simplified. In the present embodiment, the film portion 8 is formed by, for example, powder coating. Alternatively, the film portion 8 can be an insulating tape.

[0115] (Modified Example)

[0116] Figure 7 is a perspective view of a neutral point portion 110 that is a modified example that can be employed in the above-described embodiments.

[0117] The second end portions 164 of the three conductor connection bodies 160 (U-phase conductor connection body 160U, V-phase conductor connection body 160V, W-phase conductor connection body 160W) are electrically connected to constitute the neutral point portion 110.

[0118] The second end portion 164U of the U-phase conductor connection body 160U has a first circumferential extension 159U extending to the other side θ2 in the circumferential direction. The second end portion 164V of the V-phase conductor connection body 160V has a second circumferential extension 159V extending to the other side θ2 in the circumferential direction. The second end portion 164W of the W-phase conductor connection body 160W has a terminal portion 158.

[0119] The first circumferential extension 159U extends to the upper side of the second circumferential extension 159V and contacts the second circumferential extension 159V. The first circumferential extension 159U is connected to the second circumferential extension 159V. The first circumferential extension 159U and the second circumferential extension 159V constitute a first connection portion (connection portion) 111.

[0120] The second circumferential extension 159V extends to the upper side of the terminal portion 158 and contacts the terminal portion 158. The second circumferential extension 159V is connected to the terminal portion 158. The second circumferential extension 159V and the terminal portion 158 constitute a second connection portion (connection portion) 112.

[0121] According to this modification, the neutral point portion 110 has two connection portions 111, 112 for two connections of different combinations of the second end portions 164 of the three conductor connecting bodies 160, thereby improving rigidity. Thus, even if vibration is applied to the neutral point portion 110, the connection portions 111, 112 are less likely to be damaged.

[0122] The above describes various embodiments of the present application, but each structure in each embodiment and combinations thereof and the like are only examples, and addition, omission, substitution, and other changes of the structure can be made within a range not departing from the gist of the present application. In addition, the present application is not limited to the embodiments.

[0123] For example, in the above-described embodiments, the case where the motor 1 is a three-phase motor is described, but other motors such as a five-phase motor can also be used.

Claims

1. A motor, wherein the motor includes: a rotor rotatable about a central axis; and a stator disposed radially outward of the rotor, the stator includes: a winding portion having a plurality of conductor connection bodies obtained by connecting a plurality of conductors in series; and a stator core provided with a plurality of slots through which the conductor connection bodies pass, the conductor connection body has a first end portion and a second end portion, the winding portion has: a coil end located on one axial side of the stator core; and a neutral point portion located on one axial side of the stator core and electrically connecting the second end portions of three of the conductor connection bodies, the neutral point portion has two connection portions for connecting two of the second end portions of the three second end portions in different combinations, the first end portion extends from an end portion on a radial side of the coil end toward one axial side of the coil end, the second end portion extends from an end portion on a radial side of the coil end toward one axial side and the other radial side of the coil end to connect with the other second end portion.

2. The motor according to claim 1, wherein the plurality of conductor connection bodies are classified into a first phase conductor connection body, a second phase conductor connection body, and a third phase conductor connection body, the second end portion of the first phase conductor connection body has a circumferential extension portion extending in a circumferential direction, the second end portion of the second phase conductor connection body connects with the circumferential extension portion to constitute the connection portion, the second end portion of the third phase conductor connection body connects with the circumferential extension portion to constitute the connection portion.

3. The motor according to claim 1, wherein the plurality of conductor connection bodies are classified into a first phase conductor connection body, a second phase conductor connection body, and a third phase conductor connection body, the second end portion of the first phase conductor connection body has a first circumferential extension portion extending in a circumferential direction, the second end portion of the second phase conductor connection body has a second circumferential extension portion extending in a circumferential direction and connecting with the first circumferential extension portion to constitute the connection portion, the second end portion of the third phase conductor connection body connects with the second circumferential extension portion to constitute the connection portion.

4. The motor according to any one of claims 1 to 3, wherein the winding portion has a plurality of the neutral point portions, at least two of the neutral point portions are arranged in a radial direction.

5. The motor according to claim 4, wherein the second end portions are connected at the neutral point portions, of the two neutral point portions arranged in the radial direction, the second end portion connected to a first neutral point portion on the other radial side passes through one axial side or the other axial side of a second neutral point portion on the same radial side.

6. The motor according to any one of claims 1 to 3, wherein a surface of the conductor is covered with a first coating film, the surface of the conductor is exposed from the first coating film at the connection portion and is covered from above the connection portion with a second coating film.

7. A motor, wherein the motor includes: a rotor rotatable about a central axis; and a stator disposed radially outward of the rotor, the stator includes: a winding portion having a plurality of conductor connection bodies in which a plurality of conductors are connected in series; and a stator core provided with a plurality of slots through which the conductor connection bodies pass, the conductor connection body has a first end portion and a second end portion, the winding portion has a neutral point portion on an axial side of the stator core and electrically connecting the second end portions of three of the conductor connection bodies, the neutral point portion has two connection portions for connecting two of the second end portions of different combinations of the three, the winding portion has a plurality of the neutral point portions, at least two of the neutral point portions are arranged in a radial direction, the winding portion has a coil end on an axial side of the stator core, the second end portion extends from an end portion on a radial side of the coil end to an axial side and a radial other side of the coil end to be connected at the neutral point portion, of the two neutral point portions arranged in the radial direction, the second end portion connected to a first neutral point portion on a radial other side passes through an axial side or other side of a second neutral point portion on a radial side.

8. The motor according to claim 7, wherein the plurality of conductor connection bodies are classified into a first phase conductor connection body, a second phase conductor connection body, and a third phase conductor connection body, the second end portion of the first phase conductor connection body has a circumferential extension portion extending in a circumferential direction, the second end portion of the second phase conductor connection body is connected to the circumferential extension portion to constitute the connection portion, the second end portion of the third phase conductor connection body is connected to the circumferential extension portion to constitute the connection portion.

9. The motor according to claim 7, wherein the plurality of conductor connection bodies are classified into a first phase conductor connection body, a second phase conductor connection body, and a third phase conductor connection body, the second end portion of the first phase conductor connection body has a first circumferential extension portion extending in a circumferential direction, the second end portion of the second phase conductor connection body has a second circumferential extension portion connected to the first circumferential extension portion to constitute the connection portion and extending in the circumferential direction, the second end portion of the third phase conductor connection body is connected to the second circumferential extension portion to constitute the connection portion.

10. The motor according to any one of claims 7 to 9, wherein a surface of the conductor is covered with a first coating film of insulation, the surface of the conductor is exposed from the first coating film at the connection portion and is covered with a second coating film from above the connection portion.

Images