Stator, motor, and method for manufacturing a stator

Abstract

To provide a stator, a motor, and a manufacturing method of a stator, capable of aggregating a position of a terminal wire of each winding group of three phases.SOLUTION: A stator ST includes a stator core, an insulator, a first phase winding group 5U, a second phase winding group 5V and a third phase winding group 5W. The stator core has a first tooth T1 to a 12th tooth T12. One terminal line of the first phase winding group 5U is located at the first tooth T1, one terminal line of the second phase winding group 5V is located at the third tooth T3, and one terminal line of the third phase winding group 5W is located at the fifth tooth T5. The other terminal line of the first phase winding group 5U is located at the second tooth T2, the other terminal line of the second phase winding group 5V is located at the fourth tooth T4, and the other terminal line of the third phase winding group 5W is located at the sixth tooth T6.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a stator, a motor, and a method for manufacturing a stator. [Background technology]

[0002] In a conventional electric motor stator, the first, third and fifth coils are wound around the first, third and fifth teeth in a first direction, the second, fourth and sixth coils are wound around the second, fourth and sixth teeth in a second direction, the seventh, ninth and eleventh coils are wound around the seventh, ninth and eleventh teeth in a second direction, and the eighth, tenth and twelfth coils are wound around the eighth, tenth and twelfth teeth in a first direction. According to the conventional method for manufacturing an electric motor stator, the three windings can be wound quickly and simultaneously using a winding machine with a simple and inexpensive structure that can only rotate three nozzles in the same direction at the same time, allowing the electric motor stator to be manufactured quickly and inexpensively. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-7413 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the stator of the conventional electric motor, each of the U-phase winding group consisting of the first coil, the second coil, the seventh coil, and the eighth coil, the V-phase winding group consisting of the third coil, the fourth coil, the ninth coil, and the tenth coil, and the W-phase winding group consisting of the fifth coil, the sixth coil, the eleventh coil, and the twelfth coil has one end wire connected to a power supply terminal and the other end wire connected to a neutral point. In this case, the one end wire of the U-phase winding group and the other end wire of the W-phase winding group are merely adjacent to each other in the circumferential direction, and the other end wires are located at least one or more teeth apart in the circumferential direction. In other words, the one end wire and the other end wire of each of the U-phase winding group, the V-phase winding group, and the W-phase winding group are located in a dispersed manner in the circumferential direction. Therefore, the shape of the motor is restricted greatly. For example, the size of the circuit board for supplying current to the U-phase winding group, the V-phase winding group, and the W-phase winding group becomes large. As a result, the shape of the motor is subject to greater restrictions.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a stator, a motor, and a method for manufacturing a stator that enable the positions of the terminal wires of each of the three-phase winding groups to be consolidated. [Means for solving the problem]

[0006] An exemplary stator of the present invention includes a stator core, an insulator, a first phase winding group, a second phase winding group, and a third phase winding group. The stator core is disposed about a central axis extending in the up-down direction. The insulator covers at least a portion of the stator core. The first phase winding group is formed of a plurality of windings in which a first conductor is wound around the stator core via the insulator. The second phase winding group is formed of a plurality of windings in which a second conductor is wound around the stator core via the insulator. The third phase winding group is formed of a plurality of windings in which a third conductor is wound around the stator core via the insulator. The stator core has a core back, and first teeth, second teeth, third teeth, fourth teeth, fifth teeth, sixth teeth, seventh teeth, eighth teeth, ninth teeth, tenth teeth, eleventh teeth, and twelfth teeth. The core back is arranged in an annular shape around a central axis. The first teeth, second teeth, third teeth, fourth teeth, fifth teeth, sixth teeth, seventh teeth, eighth teeth, ninth teeth, tenth teeth, eleventh teeth, and twelfth teeth extend radially from the core back. The first teeth, the second teeth, the third teeth, the fourth teeth, the fifth teeth, the sixth teeth, the seventh teeth, the eighth teeth, the ninth teeth, the tenth teeth, the eleventh teeth, and the twelfth teeth are arranged in the circumferential direction in this order. The first phase winding group has a first winding wound around the first teeth in a first direction via the insulator, a second winding wound around the second teeth in a second direction opposite to the first direction via the insulator, a seventh winding wound around the seventh teeth in the second direction via the insulator, and an eighth winding wound around the eighth teeth in the first direction via the insulator.The second phase winding group includes a third winding wound in a first direction around the third tooth via the insulator, a fourth winding wound in a second direction around the fourth tooth via the insulator, a ninth winding wound in a second direction around the ninth tooth via the insulator, and a tenth winding wound in a first direction around the tenth tooth via the insulator. The third phase winding group includes a fifth winding wound in a first direction around the fifth tooth via the insulator, a sixth winding wound in a second direction around the sixth tooth via the insulator, an eleventh winding wound in a second direction around the eleventh tooth via the insulator, and a twelfth winding wound in a first direction around the twelfth tooth via the insulator. In the first phase winding group, the first winding and the eighth winding are connected, the eighth winding and the seventh winding are connected, and the seventh winding and the second winding are connected. In the second phase winding group, the third winding and the tenth winding are connected, the tenth winding and the ninth winding are connected, and the ninth winding and the fourth winding are connected. In the third phase winding group, the fifth winding and the twelfth winding are connected, the twelfth winding and the eleventh winding are connected, and the eleventh winding and the sixth winding are connected. One terminal wire of the first phase winding group is located on the first tooth, one terminal wire of the second phase winding group is located on the third tooth, and one terminal wire of the third phase winding group is located on the fifth tooth. The other terminal wire of the first phase winding group is located on the second tooth, the other terminal wire of the second phase winding group is located on the fourth tooth, and the other terminal wire of the third phase winding group is located on the sixth tooth.

[0007] An exemplary motor of the present invention includes the above-mentioned stator, a rotor, and a molded resin part. The rotor is disposed radially inward of the stator. The molded resin part covers at least the radial outer surface of the stator core and the terminal holder with resin. The molded resin part covers the winding connection part, the first neutral point connection part, the second neutral point connection part, and the third neutral point connection part. The current-carrying connection part of the power supply connection terminal is exposed from the molded resin part.

[0008] In an exemplary method for manufacturing a stator according to the present invention, the stator includes a stator core and an insulator covering at least a portion of the stator core. The stator core includes first teeth, second teeth, third teeth, fourth teeth, fifth teeth, sixth teeth, seventh teeth, eighth teeth, ninth teeth, tenth teeth, eleventh teeth, and twelfth teeth. A method for manufacturing a stator includes a first step of preparing the stator core having first teeth, second teeth, third teeth, fourth teeth, fifth teeth, sixth teeth, seventh teeth, eighth teeth, ninth teeth, tenth teeth, eleventh teeth, and twelfth teeth arranged in a straight line in this order; a second step of winding a first conductor around the first teeth with the insulator interposed therebetween, a second conductor around the third teeth with the insulator interposed therebetween, and a third conductor around the fifth teeth with the insulator interposed therebetween; and after the second step, winding the first conductor around the eighth teeth with the insulator interposed therebetween, the second conductor around the tenth teeth with the insulator interposed therebetween, and the third conductor around the twelfth teeth with the insulator interposed therebetween. a third step of winding the third conductor around the seventh tooth through the insulator, a fourth step of winding the first conductor around the ninth tooth through the insulator and the third conductor around the eleventh tooth through the insulator after the third step, a fifth step of winding the first conductor around the second tooth through the insulator, winding the second conductor around the fourth tooth through the insulator and winding the third conductor around the sixth tooth through the insulator after the fourth step, and a sixth step of bending the stator core arranged in a straight line to form the stator core into an annular shape after the fifth step. In the second step and the third step, the first conductor, the second conductor and the third conductor are wound in a first direction. In the fourth and fifth steps, the first conducting wire, the second conducting wire, and the third conducting wire are wound in a second direction that is opposite to the first direction. Effect of the Invention

[0009] According to the illustrative embodiment of the present invention, it is possible to provide a stator, a motor, and a method for manufacturing a stator that can centralize the positions of the terminal wires of each of the three-phase winding groups. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view showing the structure of a motor according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view showing a rotor and a stator according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a schematic diagram of a stator according to an embodiment of the present invention when linearly developed. [Figure 4] FIG. 4 is a perspective view showing a stator according to an embodiment of the present invention. [Diagram 5] FIG. 5 is a perspective view showing a power connection terminal according to one embodiment of the present invention. [Figure 6] FIG. 6 is a perspective view showing a neutral terminal according to an embodiment of the present invention. [Figure 7A] FIG. 7A is a perspective view showing a power supply connecting terminal and a winding connecting terminal according to one embodiment of the present invention. [Figure 7B] FIG. 7B is a plan view showing a power supply connecting terminal and a winding connecting terminal according to an embodiment of the present invention. [Figure 7C] FIG. 7C is a plan view showing another embodiment of a power supply connecting terminal and a winding connecting terminal according to an embodiment of the present invention. [Figure 8] FIG. 8 is a perspective view showing a part of the neutral terminal and a winding connection terminal according to an embodiment of the present invention. [Figure 9] FIG. 9 is a side view showing a stator according to an embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view of a terminal holder according to an embodiment of the present invention as viewed from above. [Figure 11] FIG. 11 is a perspective view showing a stator to which a terminal holder is fixed according to an embodiment of the present invention. [Figure 12] FIG. 12 is a perspective view of the terminal holder according to one embodiment of the present invention as viewed from below. [Figure 13] FIG. 13 is a perspective view showing a resin casing that houses a stator according to an embodiment of the present invention. [Figure 14] FIG. 14 is a perspective view showing a resin casing that houses a stator and a substrate according to an embodiment of the present invention. [Figure 15] FIG. 15 is a flowchart showing a method for manufacturing a stator according to an embodiment of the present invention. [Figure 16] FIG. 16 is a plan view showing stator cores arranged in a straight line according to an embodiment of the present invention. [Figure 17] FIG. 17 is a plan view showing the stator core according to one embodiment of the present invention when the stator core is formed into an annular shape.

[0011] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0012] In this specification, for convenience, the direction of the central axis AX of the motor (see FIG. 1) may be described as the up-down direction. In the drawings, for ease of understanding, the X-axis, Y-axis, and Z-axis of a three-dimensional orthogonal coordinate system are appropriately described. The positive direction of the Z-axis indicates the upward direction, and the negative direction of the Z-axis indicates the downward direction. However, the up-down direction, the upward direction, and the downward direction are defined for convenience of explanation and do not need to coincide with the vertical direction. In addition, the up-down direction is defined merely for convenience of explanation, and does not limit the orientation of the motor according to the present invention when used or assembled. Furthermore, the direction parallel to the central axis AX of the motor is simply described as the "axial direction AD", and the radial direction and the circumferential direction centered on the central axis AX of the motor are simply described as the "radial direction RD" and the "circumferential direction CD". In addition, "plan view" refers to viewing an object from the axial direction AD. In this specification, "parallel direction" also includes a direction that is approximately parallel. In addition, "upper in the axial direction AD" can be described as "one side of the axial direction AD", and "lower in the axial direction AD" can be described as "other side of the axial direction AD".

[0013] A motor MT according to an embodiment of the present invention will be described with reference to Figs. 1 to 14. Fig. 1 is a cross-sectional view showing the structure of a motor MT according to an embodiment of the present invention. The motor MT shown in Fig. 1 has 10 or 14 poles and is a 12-slot three-phase motor. The three-phase motor is, for example, a three-phase brushless motor. Since the motor MT has 10 or 14 poles, the cogging torque can be reduced compared to an eight-pole motor.

[0014] 1, the motor MT includes a rotor RT, a stator ST, a rotating shaft SH, a first cover member 1, a first bearing 11, a second cover member 2, a second bearing 21, a substrate SB, and a casing CS. The motor MT preferably further includes a terminal holder 90. The terminal holder 90 will be described later.

[0015] The casing CS corresponds to an example of a "resin molded portion."

[0016] The rotor RT is disposed about a central axis AX extending in the vertical direction. That is, as an example, the motor MT is an inner rotor type motor. However, the motor MT may be an outer rotor type motor. The rotor RT rotates about the central axis AX. The rotor RT is disposed radially inward of the stator ST in the radial direction RD.

[0017] The rotor RT has a magnet MG and a rotor core RC. The magnet MG is, for example, a permanent magnet. For example, the rotor RT may have a single magnet MG in a substantially annular shape, or may have a plurality of magnets MG arranged in the circumferential direction CD. "Substantially annular" is, for example, "substantially circular ring shape." The number of poles of the magnet MG is "10" or "14."

[0018] The rotor core RC is formed, for example, of laminated steel plates in which electromagnetic steel plates are stacked in the axial direction AD. A plurality of magnets MG are disposed inside the rotor core RC. In this embodiment, the rotor RT is a spoke-type rotor. The magnets MG may be fixed to the outer surface of the rotor core RC in the radial direction RD. In other words, the motor MT may be a surface permanent magnet (SPM) motor.

[0019] The rotating shaft SH is disposed about the central axis AX. The rotating shaft SH is generally cylindrical. The rotating shaft SH is fixed to the rotor core RC. Therefore, the rotating shaft SH rotates together with the rotor RT about the central axis AX.

[0020] The first cover member 1 is disposed at an upper portion in the axial direction AD of the motor MT.

[0021] The first cover member 1 has a cylindrical first bearing retaining portion 12 and a through hole formed in the center of the first bearing retaining portion 12. The rotating shaft SH passes through the through hole. The first bearing retaining portion 12 retains a first bearing 11. The first bearing 11 rotatably supports the rotating shaft SH. The first bearing 11 is, for example, a rolling bearing. The first cover member 1 is fitted to the opening side of the casing CS.

[0022] The second cover member 2 is disposed at a lower portion in the axial direction AD of the motor MT.

[0023] The second cover member 2 has a cylindrical second bearing retaining portion 22. The second bearing 21 rotatably supports the rotating shaft SH. The second bearing 21 is, for example, a rolling bearing. The second cover member 2 is fixed to the casing CS. The second bearing retaining portion 22 retains the second bearing 21. The second bearing retaining portion 22 is substantially cylindrical in shape with a bottom and a hole in the center.

[0024] The stator ST is disposed about a central axis AX extending in the up-down direction. The stator ST faces the magnet MG in the radial direction RD. The stator ST has a stator core 3, an insulator 4, and a three-phase winding group 5. FIG. 1 shows a winding CL constituting a certain winding group 5. The winding CL is, for example, a coil. Specifically, the stator ST has, as the three-phase winding group 5, a U-phase winding group 5U, a V-phase winding group 5V, and a W-phase winding group 5W.

[0025] The U-phase winding group 5U is composed of a plurality of windings CL in which a first conductor 51 (FIG. 3) is wound around the stator core 3 via an insulator 4. The V-phase winding group 5V is composed of a plurality of windings CL in which a second conductor 52 (FIG. 3) is wound around the stator core 3 via an insulator 4. The W-phase winding group 5W is composed of a plurality of windings CL in which a third conductor 53 (FIG. 3) is wound around the stator core 3 via an insulator 4. The first conductor 51, the second conductor 52, and the third conductor 53 are covered conductors in which metal wires are covered with a coating. The material of the metal wires is, for example, aluminum. However, the material of the metal wires may be copper instead of aluminum. The coating that covers the metal wires is, for example, an insulating resin. The material of the resin is, for example, enamel. The insulator 4 electrically insulates the stator core 3 from the windings CL. The insulator 4 is composed of an insulating material. The insulator 4 is made of, for example, a thermoplastic resin.

[0026] The U-phase winding group 5U corresponds to an example of a “first-phase winding group,” the V-phase winding group 5V corresponds to an example of a “second-phase winding group,” and the W-phase winding group 5W corresponds to an example of a “third-phase winding group.” Details of the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W will be described later.

[0027] The stator core 3 is disposed about a central axis AX extending in the up-down direction. As an example, the stator core 3 is disposed around the central axis AX and is generally annular. "Regularly annular" means, for example, "generally circular ring-shaped". The stator core 3 is formed, for example, from laminated steel plates in which thin electromagnetic steel plates are laminated in the axial direction AD. The stator core 3 has a core back 31 and a plurality of teeth T. Details of the stator core 3 will be described later.

[0028] The insulator 4 covers at least a part of the stator core 3. As an example, the insulator 4 is disposed around the central axis AX and has a substantially annular shape. "Substantially annular" means, for example, "substantially circular ring shape". The insulator 4 is an electrical insulator. The insulator 4 may be formed of a single member, or may be formed of a plurality of separate members. For example, the insulator 4 is a resin molded product into which the stator core 3 is inserted. Also, the insulator 4 may have a structure that is separately attached to the stator core 3. Details of the insulator 4 will be described later.

[0029] The substrate SB is substantially flat. The substrate SB is substantially perpendicular to the axial direction AD. The substrate SB is a printed circuit board on which wiring is printed, and is equipped with various electronic components. The substrate SB faces at least a portion of the stator ST and at least a portion of the rotor RT in the axial direction AD, and is disposed substantially horizontally.

[0030] The casing CS accommodates at least a part of the rotor RT and the stator ST. Specifically, the casing CS has an opening that opens upward in the axial direction AD. The casing CS is substantially cylindrical with a bottom, and is a member made of a thermosetting resin. "Substantially cylindrical with a bottom" is, for example, "substantially cylindrical with a bottom". The casing CS is obtained by pouring resin into the inside of a mold into which the stator ST is inserted. In other words, the casing CS is a resin molded product into which the stator ST is inserted. Therefore, the stator ST is fixed by the casing CS. The second bearing retaining portion 22 is fixed to the bottom of the casing CS in the axial direction AD.

[0031] The casing CS covers at least the outer surface in the radial direction RD of the stator core 3 with resin. In this embodiment, the casing CS covers at least the outer surface in the radial direction RD of the stator core 3 and the terminal holder 90 with resin. Meanwhile, at least the inner surface in the radial direction RD of the stator core 3 is exposed from the casing CS. The casing CS also houses at least a portion of the rotor RT.

[0032] Next, the stator ST will be described in detail with reference to Figures 1 and 2. Figure 2 is a plan view showing the rotor RT and the stator ST.

[0033] As shown in FIG. 2, the core back 31 is disposed along the circumferential direction CD. Specifically, the core back 31 is disposed in a substantially annular shape centered on the central axis AX. The "substantially annular shape" is, for example, a "substantially angular annular shape" or a "substantially circular annular shape". The "substantially angular annular shape" indicates that at least the outer edge is polygonal. The "substantially circular annular shape" indicates that at least the outer edge is circular. The core back 31 may be formed of a single member or may be formed of a plurality of separate members. As an example, the core back 31 has twelve core back portions 311. The twelve core back portions 311 are disposed along the circumferential direction CD. The twelve core back portions 311 may be formed as a single member or may be separate members. As an example, the insulator 4 has twelve insulator portions 41. The twelve insulator portions 41 are disposed along the circumferential direction CD. The twelve insulator portions 41 may be formed as a single member or may be separate members.

[0034] 1 , for example, the insulator portions 41 cover parts of the teeth T and parts of the core back portion 311. Specifically, the insulator portions 41 cover both end faces of the teeth T in the axial direction AD, at least a part of one end face of the teeth T in the circumferential direction CD, at least a part of the other end face of the teeth T in the circumferential direction CD, at least a part of one end face of the core back portion 311 in the axial direction AD, and at least a part of the other end face of the core back portion 311 in the axial direction AD.

[0035] Returning to FIG. 2, the stator core 3 has a plurality of teeth T (FIG. 1), including a first tooth T1, a second tooth T2, a third tooth T3, a fourth tooth T4, a fifth tooth T5, a sixth tooth T6, a seventh tooth T7, an eighth tooth T8, a ninth tooth T9, a tenth tooth T10, an eleventh tooth T11, and a twelfth tooth T12. The first tooth T1 to the twelfth tooth T12 are disposed at equal intervals along the circumferential direction CD. The twelve core back portions 311 are provided corresponding to the first tooth T1 to the twelfth tooth T12, respectively. The twelve insulator portions 41 are provided corresponding to the first tooth T1 to the twelfth tooth T12, respectively.

[0036] The first teeth T1, the second teeth T2, the third teeth T3, the fourth teeth T4, the fifth teeth T5, the sixth teeth T6, the seventh teeth T7, the eighth teeth T8, the ninth teeth T9, the tenth teeth T10, the eleventh teeth T11, and the twelfth teeth T12 extend in the radial direction RD from the core back 31. As an example, the first teeth T1 to the twelfth teeth T12 extend inward in the radial direction RD from the core back 31. A tip surface in the radial direction RD of each of the first teeth T1 to the twelfth teeth T12 faces the magnet MG in the radial direction RD with a gap therebetween.

[0037] The first teeth T1, second teeth T2, third teeth T3, fourth teeth T4, fifth teeth T5, sixth teeth T6, seventh teeth T7, eighth teeth T8, ninth teeth T9, tenth teeth T10, eleventh teeth T11, and twelfth teeth T12 are arranged in this order in the circumferential direction CD.

[0038] The U-phase winding group 5U has a first winding U1, a second winding U4, a seventh winding U3, and an eighth winding U2 as windings CL (FIG. 1). The first winding U1 is wound around the first tooth T1 via the insulator 4 in a first direction D1. The first direction D1 indicates, for example, a clockwise direction. The second winding U4 is wound around the second tooth T2 via the insulator 4 in a second direction D2 opposite to the first direction D1. The second direction D2 indicates, for example, a counterclockwise direction. The seventh winding U3 is wound around the seventh tooth T7 in the second direction D2 via the insulator 4. The eighth winding U2 is wound around the eighth tooth T8 in the first direction D1 via the insulator 4.

[0039] The V-phase winding group 5V has a third winding V1, a fourth winding V4, a ninth winding V3, and a tenth winding V2 as windings CL (FIG. 1). The third winding V1 is wound in the first direction D1 around the third tooth T3 via the insulator 4. The fourth winding V4 is wound in the second direction D2 around the fourth tooth T4 via the insulator 4. The ninth winding V3 is wound in the second direction D2 around the ninth tooth T9 via the insulator 4. The tenth winding V2 is wound in the first direction D1 around the tenth tooth T10 via the insulator 4.

[0040] The W-phase winding group 5W has a fifth winding W1, a sixth winding W4, an eleventh winding W3, and a twelfth winding W2 as windings CL (FIG. 1). The fifth winding W1 is wound around the fifth tooth T5 in the first direction D1 via the insulator 4. The sixth winding W4 is wound around the sixth tooth T6 in the second direction D2 via the insulator 4. The eleventh winding W3 is wound around the eleventh tooth T11 in the second direction D2 via the insulator 4. The twelfth winding W2 is wound around the twelfth tooth T12 in the first direction D1 via the insulator 4.

[0041] Next, the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W will be described in detail with reference to Fig. 3. Fig. 3 is a schematic diagram of the stator ST when linearly developed. In Fig. 3, the first teeth T1 to the twelfth teeth T12 are typically represented by rectangular shapes. Also, the first winding U1 to the twelfth winding W2 are typically represented by rectangular shapes with arrows. In this case, the arrows indicate the winding directions of the first winding U1 to the twelfth winding W2.

[0042] As shown in FIG. 3, in the U-phase winding group 5U, the first winding U1 and the eighth winding U2 are connected. In addition, the eighth winding U2 and the seventh winding U3 are connected. In addition, the seventh winding U3 and the second winding U4 are connected. Specifically, the U-phase winding group 5U has crossover wires 511, 512, and 513 that connect the windings together. The crossover wires 511, 512, and 513 are part of the first conducting wire 51. The crossover wire 511 connects the first winding U1 and the eighth winding U2. The crossover wire 512 connects the eighth winding U2 and the seventh winding U3. The crossover wire 513 connects the seventh winding U3 and the second winding U4. That is, the first winding U1, the eighth winding U2, the seventh winding U3, and the second winding U4 are connected in series in this order by crossover wires 511-513.

[0043] In the V-phase winding group 5V, the third winding V1 and the tenth winding V2 are connected. In addition, the tenth winding V2 and the ninth winding V3 are connected. In addition, the ninth winding V3 and the fourth winding V4 are connected. Specifically, the V-phase winding group 5V has crossover wires 521, 522, and 523 that connect the windings together. The crossover wires 521, 522, and 523 are part of the second conducting wire 52. The crossover wire 521 connects the third winding V1 and the tenth winding V2. The crossover wire 522 connects the tenth winding V2 and the ninth winding V3. The crossover wire 523 connects the ninth winding V3 and the fourth winding V4. That is, the third winding V1, the tenth winding V2, the ninth winding V3, and the fourth winding V4 are connected in series in this order by crossover wires 521-523.

[0044] In the W-phase winding group 5W, the fifth winding W1 and the twelfth winding W2 are connected. In addition, the twelfth winding W2 and the eleventh winding W3 are connected. In addition, the eleventh winding W3 and the sixth winding W4 are connected. Specifically, the W-phase winding group 5W has crossover wires 531, 532, and 533 that connect the windings together. The crossover wires 531, 532, and 533 are part of the third conducting wire 53. The crossover wire 531 connects the fifth winding W1 and the twelfth winding W2. The crossover wire 532 connects the twelfth winding W2 and the eleventh winding W3. The crossover wire 533 connects the eleventh winding W3 and the sixth winding W4. That is, the fifth winding W1, the twelfth winding W2, the eleventh winding W3, and the sixth winding W4 are connected in series by crossover wires 531-533 in this order.

[0045] One terminal wire 5US of U-phase winding group 5U is located on the first tooth T1, one terminal wire 5VS of V-phase winding group 5V is located on the third tooth T3, and one terminal wire 5WS of W-phase winding group 5W is located on the fifth tooth T5.

[0046] In addition, the other terminal wire 5UE of the U-phase winding group 5U is located on the second tooth T2, the other terminal wire 5VE of the V-phase winding group 5V is located on the fourth tooth T4, and the other terminal wire 5WE of the W-phase winding group 5W is located on the sixth tooth T6.

[0047] Therefore, according to the present embodiment, in the stator ST with a 12-slot structure, the terminal wires 5US, 5UE of the U-phase winding group 5U, the terminal wires 5VS, 5VE of the V-phase winding group 5V, and the terminal wires 5WS, 5WE of the W-phase winding group 5W can be consolidated into the first tooth T1 to the sixth tooth T6. That is, the positions of the terminal wires 5US, 5UE, 5VS, 5VE, 5WS, and 5WE of each of the three-phase winding groups 5 can be consolidated. Therefore, compared to a case where the positions of the terminal wires of each of the three-phase winding groups are dispersed in the circumferential direction, the constraints on the shape of the motor MT can be relaxed. For example, the size of the substrate SB for supplying current to the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W can be prevented from becoming large. As a result, the constraints on the shape of the motor MT are reduced compared to a case where the size of the substrate is large. Note that, for example, when the positions of the terminal wires of each of the three-phase winding groups are dispersed in the circumferential direction, the size of the substrate increases, and the constraints on the shape of the motor become greater.

[0048] For example, the terminal wires 5US, 5VS, and 5WS respectively indicate the winding start terminal wires of the first conducting wire 51, the second conducting wire 52, and the third conducting wire 53. In this case, for example, the terminal wires 5UE, 5VE, and 5WE respectively indicate the winding end terminal wires of the first conducting wire 51, the second conducting wire 52, and the third conducting wire 53. However, in this example, the winding start and winding end may be reversed.

[0049] According to the present embodiment, the winding directions of the first winding U1, the third winding V1, and the fifth winding W1 are the same as each other, that is, the first direction D1. Therefore, the winding of the first conductor 51 around the first tooth T1, the winding of the second conductor 52 around the third tooth T3, and the winding of the third conductor 53 around the fifth tooth T5 can be simultaneously performed in the first direction D1. In addition, the winding directions of the eighth winding U2, the tenth winding V2, and the twelfth winding W2 are the same as each other, that is, the first direction D1. Therefore, the winding of the first conductor 51 around the eighth tooth T8, the winding of the second conductor 52 around the tenth tooth T10, and the winding of the third conductor 53 around the twelfth tooth T12 can be simultaneously performed in the first direction D1.

[0050] In addition, the winding directions of the seventh winding U3, the ninth winding V3, and the eleventh winding W3 are the same, that is, the second direction D2. Therefore, the winding of the first conductor 51 around the seventh tooth T7, the winding of the second conductor 52 around the ninth tooth T9, and the winding of the third conductor 53 around the eleventh tooth T11 can be simultaneously performed in the second direction D2. In addition, the winding directions of the second winding U4, the fourth winding V4, and the sixth winding W4 are the same, that is, the second direction D2. Therefore, the winding of the first conductor 51 around the second tooth T2, the winding of the second conductor 52 around the fourth tooth T4, and the winding of the third conductor 53 around the sixth tooth T6 can be simultaneously performed in the second direction D2.

[0051] As a result of the above, the winding time required to form the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W in the stator ST can be shortened.

[0052] Furthermore, according to this embodiment, the terminal wire 5US of the U-phase winding group 5U, the terminal wire 5VE of the V-phase winding group 5V, and the terminal wire 5WS of the W-phase winding group 5W are connected to the neutral point. In this case, the terminal wire 5UE of the U-phase winding group 5U, the terminal wire 5VS of the V-phase winding group 5V, and the terminal wire 5WE of the W-phase winding group 5W are energized to make the energization direction the same. Therefore, it is not required to individually control the energization direction for the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W. As a result, the control of the control IC (Integrated Circuit) for energizing the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W and the wiring pattern of the board SB can be simplified.

[0053] Next, the stator ST will be described in detail with reference to Figs. 2 to 4. As shown in Fig. 3, the stator ST further includes a power supply connection terminal 6 that electrically connects any one of the winding groups 5 among the U-phase winding group 5U to the W-phase winding group 5W to a current carrying wire L that carries current to the winding group 5. In this embodiment, the stator ST includes power supply connection terminals 6A, 6B, and 6C. The power supply connection terminal 6A carries current to the W-phase winding group 5W, the power supply connection terminal 6B carries current to the V-phase winding group WV, and the power supply connection terminal 6C carries current to the U-phase winding group 5U. The power supply connection terminals 6A to 6C are made of, for example, a metal having electrical conductivity. The power supply connection terminals 6A to 6C may be directly connected to a wiring pattern formed on the substrate SB. In this case, the wiring pattern corresponds to the "current carrying wire". In Figs. 2 and 3, the power supply connection terminals 6A to 6C are hatched with dots to make the drawings easier to see.

[0054] Here, the "conductive terminal wire" is defined with reference to FIG. 3. The conductive terminal wire of the W-phase winding group 5W is either one of the one terminal wire 5WS and the other terminal wire 5WE of the W-phase winding group 5W. The conductive terminal wire of the V-phase winding group 5V is either one of the one terminal wire 5VS and the other terminal wire 5VE of the V-phase winding group 5V. The conductive terminal wire of the U-phase winding group 5U is either one of the one terminal wire 5US and the other terminal wire 5UE of the U-phase winding group 5U. In this embodiment, each of the terminal wire 5WE, the terminal wire 5VS, and the terminal wire 5UE is a conductive terminal wire. Hereinafter, the terminal wire 5WE, the terminal wire 5VS, and the terminal wire 5UE may be described as the conductive terminal wire 5WE, the conductive terminal wire 5VS, and the conductive terminal wire 5UE, respectively.

[0055] As shown in Fig. 3, the power supply connection terminal 6A has an electric connection portion 61, a winding connection portion 62, and a wiring portion 63. The electric connection portion 61 is connected to the electric wire L1. The winding connection portion 62 is directly or indirectly connected to the electric terminal wire 5WE. Note that "directly connected" means, for example, that the electric terminal wire 5WE is connected to the winding connection portion 62 by soldering. "Indirectly connected" means, for example, that the electric terminal wire 5WE is connected to the winding connection portion 62 by soldering via a terminal such as a pin.

[0056] In the power supply connection terminal 6A, the wiring portion 63 connects the energizing connection portion 61 and the winding connection portion 62. The wiring portion 63 is arranged across two or more consecutive teeth T from the first tooth T1 to the twelfth tooth T12 while being spaced apart from the first tooth T1 to the twelfth tooth T12. As an example, the wiring portion 63 is arranged from the winding connection portion 62 to the fifth tooth T5 and the fourth tooth T4. This is because the winding connection portion 62 is arranged at a distance from the nearest power supply connection terminal 6B by the distance of the fifth tooth T5 and the fourth tooth T4.

[0057] According to this embodiment, even if the winding connection portion 62 of the power supply connection terminal 6A is isolated from the other power supply connection terminals 6B, 6C, the current-carrying connection portion 61 of the power supply connection terminal 6A can be disposed close to the other power supply connection terminals 6B, 6C by the wiring portion 63. This allows the multiple power supply connection terminals 6A to 6C to be consolidated together. As a result, it is possible to further prevent the size of the board SB connected to each of the power supply connection terminals 6A to 6C from increasing.

[0058] Fig. 4 is a perspective view showing the stator ST. As shown in Figs. 2 and 4, the wiring portion 63 of the power supply connection terminal 6A is disposed apart from the fifth winding W1 and the fourth winding V4 along the axial direction AD. Specifically, the wiring portion 63 is disposed apart from the fifth winding W1 and the fourth winding V4 above in the axial direction AD. Therefore, according to this embodiment, it is possible to prevent the wiring portion 63 from coming into contact with the fifth winding W1 and the fourth winding V4.

[0059] The arrangement of the wiring portion 63 is not particularly limited as long as the wiring portion 63 does not contact the first winding U1 to the twelfth winding W2 and the neutral terminal 7 described below. For example, the wiring portion 63 may be arranged at a position shifted outward in the radial direction RD with respect to the first winding U1 to the twelfth winding W2 in a plan view.

[0060] Here, as shown in FIG. 4, the power supply connection terminals 6B and 6C have an electric connection portion 61, a winding connection portion 62, and a wiring portion 63, similar to the power supply connection terminal 6A. In this case, the winding connection portion 62 of the power supply connection terminal 6B is directly or indirectly connected to the electric terminal wire 5VS (FIG. 3). Also, the winding connection portion 62 of the power supply connection terminal 6C is directly or indirectly connected to the electric terminal wire 5UE (FIG. 3). Note that, regarding the electric terminal wires 5VS and 5UE, "directly connected" and "indirectly connected" are the same as those of the electric terminal wire 5WE. Also, as an example of "indirectly connected", there is a gap between the winding connection portion 62 of the power supply connection terminal 6B and the electric terminal wire 5VS, and the gap is filled with solder, resulting in an indirect connection. In other words, it is sufficient that the winding connection portion 62 and the electric terminal wire 5VS are electrically conductive. This also applies to the connection between the winding connection portion 62 of the power supply connection terminal 6C and the current terminal wire 5UE, and the connection between the winding connection portion 62 of the power supply connection terminal 6A and the current terminal wire 5WE.

[0061] Next, the power supply connection terminal 6A will be described in detail with reference to Fig. 2 and Fig. 5. As shown in Fig. 2, the wiring portion 63 of the power supply connection terminal 6A is curved along the circumferential direction CD in a plan view. Also, the winding connection portion 62 extends outward in the radial direction RD from the wiring portion 63 in a plan view.

[0062] FIG. 5 is a perspective view showing the power supply connection terminal 6A. As shown in FIG. 5, the current connection portion 61 of the power supply connection terminal 6A extends along the axial direction AD. Specifically, the current connection portion 61 extends upward in the axial direction AD. It is preferable that the current connection portion 61, the wiring portion 63, and the winding connection portion 62 are configured as a single member. This preferable example reduces the number of parts of the stator ST. Also, a structure for connecting the respective parts constituting the power supply connection terminal 6A is not necessary, and the structure of the power supply connection terminal 6A can be simplified. In this embodiment, the "structure for connecting the respective parts" is, for example, solder or crimping.

[0063] Moreover, the winding connection portion 62 of the power supply connection terminal 6A preferably has a flat portion 621 and a through hole 622. The flat portion 621 extends in a direction intersecting the axial direction AD. Specifically, the flat portion 621 extends in a direction substantially perpendicular to the axial direction AD. The through hole 622 penetrates the flat portion 621 in the axial direction AD. The flat portion 621 and the through hole 622 will be described later.

[0064] The configurations of the other power supply connection terminals 6B and 6C are similar to the configuration of the power supply connection terminal 6A described with reference to FIG.

[0065] Next, the neutral point will be described with reference to Figs. 2 to 4 and 6. The neutral point is a connection point where any one of the terminal wires 5US, 5UE of the U-phase winding group 5U, any one of the terminal wires 5VS, 5VE of the V-phase winding group 5V, and any one of the terminal wires 5WS, 5WE of the W-phase winding group 5W are commonly connected. The potential of the neutral point is set to a constant potential, for example. The constant potential is, for example, zero volts. In this case, the neutral point is, for example, grounded.

[0066] Here, the "neutral point terminal wire" is defined with reference to FIG. 3. The neutral point terminal wire of the W-phase winding group 5W is either one of the one terminal wire 5WS and the other terminal wire 5WE of the W-phase winding group 5W, and is a terminal wire different from the current-carrying wire terminal. The neutral point terminal wire of the V-phase winding group 5V is either one of the one terminal wire 5VS and the other terminal wire 5VE of the V-phase winding group 5V, and is a terminal wire different from the current-carrying wire terminal. The neutral point terminal wire of the U-phase winding group 5U is either one of the one terminal wire 5US and the other terminal wire 5UE of the U-phase winding group 5U, and is a terminal wire different from the current-carrying wire terminal. In this embodiment, each of the terminal wire 5WS, the terminal wire 5VE, and the terminal wire 5US is a neutral point terminal wire. Hereinafter, the terminal conductor 5WS, the terminal conductor 5VE, and the terminal conductor 5US may be referred to as the neutral point terminal conductor 5WS, the neutral point terminal conductor 5VE, and the neutral point terminal conductor 5US, respectively. The neutral point terminal conductor 5WS, the neutral point terminal conductor 5VE, and the neutral point terminal conductor 5US are connected to the neutral point.

[0067] As shown in FIG. 3, the stator ST further includes a neutral terminal 7. In FIG. 2 and FIG. 3, the neutral terminal 7 is hatched with dots to make the drawings easier to see. The neutral terminal 7 electrically connects the neutral terminal wire 5WS, the neutral terminal wire 5VE, and the neutral terminal wire 5US. As shown in FIG. 2 to FIG. 4, the neutral terminal 7 is disposed across two or more consecutive teeth T from the first tooth T1 to the twelfth tooth T12 while being spaced apart from the first tooth T1 to the twelfth tooth T12. As an example, the neutral terminal 7 is disposed across the first tooth T1 to the fifth tooth T5.

[0068] Therefore, according to this embodiment, a neutral point can be easily formed by the neutral point terminal 7 regardless of the positions of the neutral point terminal wire 5US of the U-phase winding group 5U, the neutral point terminal wire 5VE of the V-phase winding group 5V, and the neutral point terminal wire 5WS of the W-phase winding group 5W.

[0069] 3, the neutral point terminal 7 has a first neutral point connection portion 71, a second neutral point connection portion 72, a third neutral point connection portion 73, and a neutral point wiring portion 74. The first neutral point connection portion 71 is connected to the neutral point terminal wire 5US of the U-phase winding group 5U. The second neutral point connection portion 72 is connected to the neutral point terminal wire 5VE of the V-phase winding group 5V. The third neutral point connection portion 73 is connected to the neutral point terminal wire 5WS of the W-phase winding group 5W. The neutral point wiring portion 74 connects the first neutral point connection portion 71, the second neutral point connection portion 72, and the third neutral point connection portion 73.

[0070] As shown in FIG. 2 and FIG. 4, the neutral point wiring portion 74 is curved along the circumferential direction CD in a plan view. As an example, the neutral point wiring portion 74 is disposed radially outward from the core back 31 in a plan view. As an example, the neutral point wiring portion 74 is disposed radially outward from the wiring portion 63 of the power supply connection terminal 6A in a plan view. Therefore, the length in the axial direction AD of the stator ST can be shortened compared to a case in which the neutral point wiring portion 74 and the power supply connection terminal 6A are disposed overlapping each other in the axial direction AD. As an example, the neutral point wiring portion 74 is disposed at a position shifted in the radial direction RD from the first winding U1 to the twelfth winding W2 and spaced apart from each other. As a result, according to this embodiment, the neutral point wiring portion 74 can be prevented from contacting the first winding U1 to the twelfth winding W2 compared to a case in which the neutral point wiring portion 74 is disposed above the first winding U1 to the twelfth winding W2 in the axial direction AD.

[0071] Further, the first neutral point connection portion 71, the second neutral point connection portion 72, and the third neutral point connection portion 73 extend from the neutral point wiring portion 74 inward in the radial direction RD.

[0072] The arrangement of the neutral point wiring part 74 is not particularly limited as long as the neutral point wiring part 74 does not contact the first winding U1 to the twelfth winding W2 and the power supply connection terminals 6A to 6C. For example, the neutral point wiring part 74 may be arranged above the first winding U1 to the twelfth winding W2 in the axial direction AD in a plan view.

[0073] Next, the neutral point terminal 7 will be described with reference to FIG. 6. FIG. 6 is a perspective view showing the neutral point terminal 7. As shown in FIG. 6, the neutral point wiring portion 74 of the neutral point terminal 7 is curved along the circumferential direction CD. In addition, the first neutral point connection portion 71, the second neutral point connection portion 72, the third neutral point connection portion 73, and the neutral point wiring portion 74 are preferably configured as a single member. According to this preferred example, the number of parts of the stator ST can be reduced. In addition, a structure for connecting the respective parts that configure the neutral point terminal 7 is not necessary, and the structure of the neutral point terminal 7 can be simplified.

[0074] Moreover, each of the first neutral point connecting portion 71, the second neutral point connecting portion 72, and the third neutral point connecting portion 73 of the neutral point terminal 7 preferably has a flat portion 701 and a through hole 702. The flat portion 701 extends in a direction intersecting the axial direction AD. Specifically, the flat portion 701 extends in a direction substantially perpendicular to the axial direction AD. The through hole 702 penetrates the flat portion 701 in the axial direction AD. The flat portion 701 and the through hole 702 will be described later.

[0075] Next, the terminal blocks 42A-42F and the winding connection terminals 81A-81F will be described with reference to Figures 3, 4, 7A, 7B, and 8. As shown in Figure 4, the stator ST further includes a plurality of terminal blocks 42A-42F and a plurality of winding connection terminals 81A-81F.

[0076] The terminal blocks 42A, 42D, 42E, 42B, 42C, and 42F are arranged at approximately equal intervals along the circumferential direction CD. The winding connection terminals 81A to 81F are arranged corresponding to the terminal blocks 42A to 42F, respectively. The winding connection terminals 81A to 81F extend in the axial direction AD from the terminal blocks 42A to 42F, respectively.

[0077] As shown in FIG. 3, each of the winding connection terminals 81A to 81F is connected to one of the winding groups 5 among the U-phase winding group 5U to the W-phase winding group 5W. In this embodiment, the winding connection terminal 81A is connected to the current terminal wire 5WE of the W-phase winding group 5W. The winding connection terminal 81B is connected to the current terminal wire 5VS of the V-phase winding group 5V. The winding connection terminal 81C is connected to the current terminal wire 5UE of the U-phase winding group 5U. The winding connection terminal 81D is connected to the neutral point terminal wire 5WS of the W-phase winding group 5W. The winding connection terminal 81E is connected to the neutral point terminal wire 5VE of the V-phase winding group 5V. The winding connection terminal 81F is connected to the neutral point terminal wire 5US of the U-phase winding group 5U.

[0078] Fig. 7A is a perspective view showing the power supply connection terminal 6B and the winding connection terminal 81B. As shown in Fig. 7A, the winding connection terminal 81B passes through a through hole 622 of the power supply connection terminal 6B in the axial direction AD. Of both surfaces 621A and 621B in the axial direction AD of the flat portion 621 of the power supply connection terminal 6B, the surface 621A opposite to the surface 621B on the terminal block 42B side is electrically connected to the winding connection terminal 81B via solder (not shown).

[0079] According to this embodiment, the winding connection portion 62 of the power supply connection terminal 6B has the flat portion 621, so that when the winding connection portion 62 of the power supply connection terminal 6B is connected to the winding connection terminal 81B with solder, the flat portion 621 can receive the solder. As a result, it is possible to prevent the solder from dripping.

[0080] Specifically, the winding connection terminal 81B is a pin extending in the axial direction AD. The current carrying end wire 5VS of the V-phase winding group 5V is wound around the winding connection terminal 81B and is electrically connected to the winding connection terminal 81B via solder. Therefore, according to this embodiment, the work of soldering the current carrying end wire 5VS is easy. The winding connection terminal 81B is not limited to a pin and may be, for example, a connector.

[0081] Furthermore, the current connection portion 61 of the power supply connection terminal 6B is separated from the winding connection terminal 81B by the wiring portion 63. This allows the material of the solder used to electrically connect the current terminal wire 5VS of the V-phase winding group 5V to the winding connection terminal 81B to be different from the material of the solder used to electrically connect the current wire L2 to the current connection portion 61. This allows the connection by soldering to be suitably performed depending on the materials of the current terminal wire 5VS and the current wire L2.

[0082] 7A, the terminal block 42B is disposed at an upper end in the axial direction AD of the insulator 4. Specifically, the terminal block 42B is disposed at an upper end in the axial direction AD of the insulator part 41. Particularly in this embodiment, the terminal block 42B is configured as a part of the insulator 4.

[0083] 7B is a plan view showing the power supply connection terminal 6B and the winding connection terminal 81B. As shown in FIG. 7B, the inner diameter d1 of the through hole 622 of the winding connection portion 62 is preferably larger than the diameter d2 of the current terminal wire 5VS wound around the winding connection terminal 81B. According to this preferred example, the current terminal wire 5VS can be wound around the winding connection terminal 81B not densely but with wider intervals in the axial direction AD. Thus, the current terminal wire 5VS can be covered with solder. As a result, good electrical conduction is achieved between the current terminal wire 5VS and the winding connection terminal 81B.

[0084] The configurations of the power supply connection terminals 6A, 6C, the winding connection terminals 81A, 81C, and the terminal blocks 42A, 42C are similar to the configurations of the power supply connection terminal 6B, the winding connection terminal 81B, and the terminal block 42B described with reference to Figures 3, 4, 7A, and 7B.

[0085] Fig. 7C is a plan view showing another embodiment of the power supply connection terminal 6B and the winding connection terminal 81B. As shown in Fig. 7C, the flat portion 621 of the power supply connection terminal 6B may have a notch 623 instead of the through hole 622 of Fig. 7B. The notch 623 is a portion cut out in the flat portion 621 in a direction intersecting the axial direction AD. In this embodiment, the notch 623 is a portion cut out in the flat portion 621 in a direction substantially perpendicular to the axial direction AD. The winding connection terminal 81B passes inside the notch 623 in the axial direction AD.

[0086] The flat portions 621 of the power connection terminals 6A, 6C may have notches 623 instead of the through holes 622.

[0087] Fig. 8 is a perspective view showing a part of the neutral terminal 7 and the winding connection terminal 81D. As shown in Fig. 8, the winding connection terminal 81D passes through a through hole 702 of the neutral terminal 7 in the axial direction AD. Of both surfaces 701A and 701B in the axial direction AD of the flat portion 701 of the neutral terminal 7, the surface 701A opposite to the surface 701B on the terminal block 42D side is electrically connected to the winding connection terminal 81D via solder (not shown).

[0088] According to this embodiment, the third neutral point connecting portion 73 of the neutral point terminal 7 has the flat portion 701, so that when the third neutral point connecting portion 73 of the neutral point terminal 7 is connected to the winding connecting terminal 81D by soldering, the flat portion 701 can receive the solder. As a result, it is possible to prevent the solder from dripping.

[0089] The winding connection terminal 81D is a pin extending in the axial direction AD. The neutral point terminal wire 5WS is wound around the winding connection terminal 81D and is electrically connected to the winding connection terminal 81D via solder.

[0090] Furthermore, the inner diameter of the through hole 702 is preferably larger than the diameter of the neutral point terminal wire 5WS when it is wound around the winding connection terminal 81D. This is similar to the inner diameter d1 of the through hole 622 shown in Fig. 7B. Moreover, the flat portion 701 may have a notch 623 shown in Fig. 7C instead of the through hole 702.

[0091] The configurations of the first neutral point connection portion 71 and the second neutral point connection portion 72 of the neutral point terminal 7, the winding connection terminals 81E, 81F, and the terminal blocks 42E, 42F are similar to the configurations of the third neutral point connection portion 73, the winding connection terminal 81D, and the terminal block 42D described with reference to Figure 8.

[0092] Next, the power supply connection terminals 6A to 6C and the neutral terminal 7 will be described with reference to FIG. 9. FIG. 9 is a side view showing the stator ST. As an example, attention will be given to the power supply connection terminal 6B and the neutral terminal 7. As shown in FIG. 9, the power supply connection terminal 6B and the neutral terminal 7 are spaced apart from the stator core 3 and the winding group 5 in the axial direction AD. That is, the power supply connection terminal 6B and the neutral terminal 7 are located above the stator core 3 and the winding group 5 in the axial direction AD. In addition, the current connection portion 61, the wiring portion 63, and the winding connection portion 62 of the power supply connection terminal 6B are located further away from the stator core 3 and the winding group 5 in the axial direction AD than the neutral wiring portion 74 of the neutral terminal 7. That is, the current connection portion 61, the wiring portion 63, and the winding connection portion 62 of the power supply connection terminal 6B are located above the neutral wiring portion 74 of the neutral terminal 7 in the axial direction AD.

[0093] The height of the winding connection portion 62 and the wiring portion 63 of the power supply connection terminal 6B is approximately the same as the height of the first neutral point connection portion 71, the second neutral point connection portion 72, and the third neutral point connection portion 73 of the neutral point terminal 7. The "height" indicates, for example, the height based on the upper end of the axial direction AD of the stator core 3. In the neutral point terminal 7, the neutral point wiring portion 74 is located on the stator core 3 side with respect to the first neutral point connection portion 71, the second neutral point connection portion 72, and the third neutral point connection portion 73.

[0094] The electrical connection parts 61, wiring parts 63 and winding connection parts 62 of the power supply connection terminals 6A and 6C are similar to those of the power supply connection terminal 6B described with reference to FIG.

[0095] Furthermore, the insulator 4 has a crossover wire arrangement section 43. In the crossover wire arrangement section 43 shown in Fig. 9, crossover wires 511-513, 521-523, 531-533 (Fig. 3) of the winding CL (first winding U1-twelfth winding W2) are arranged. In particular, as shown in Fig. 3, the crossover wires 511, 513, 521, 523, 531, 533 are wired across two or more teeth T from the first tooth T1 to the twelfth tooth T12. Furthermore, as shown in Fig. 9, the crossover wire arrangement section 43 is located on the opposite side in the axial direction AD to the power supply connection terminals 6A-6C and the neutral terminal 7 across the stator core 3.

[0096] Therefore, according to this embodiment, wiring can be easily performed so that the power connection terminals 6A to 6C and the neutral terminal 7 do not come into contact with the crossovers 511 to 513, 521 to 523, and 531 to 533 arranged in the crossover arrangement section 43.

[0097] Specifically, the crossover wire arrangement portion 43 is arranged in a substantially annular shape along the circumferential direction CD. The "substantially annular" shape is, for example, "substantially circular". In this embodiment, the crossover wire arrangement portion 43 has a plurality of crossover wire arrangement elements 431. The plurality of crossover wire arrangement elements 431 are arranged along the circumferential direction CD. The crossover wire arrangement elements 431 are a lower portion of the insulator portion 41 in the axial direction AD.

[0098] Next, the terminal holder 90 will be described with reference to Fig. 10 to Fig. 12. Fig. 10 is a perspective view of the terminal holder 90 as viewed from above. Fig. 11 is a perspective view showing the stator core 3 to which the terminal holder 90 is fixed. In Fig. 10 and Fig. 11, the power connection terminals 6A to 6C and the neutral terminal 7 are hatched with dots to make the drawings easier to see.

[0099] As an example, the terminal holder 90 has a substantially arc shape as shown in Fig. 10. The terminal holder 90 is made of an electrical insulator. Furthermore, as shown in Fig. 11, the terminal holder 90 is fixed to the insulator 4.

[0100] Moreover, the terminal holder 90 holds at least one of the power supply connection terminals 6A to 6C and the neutral terminal 7. In this embodiment, the terminal holder 90 holds the power supply connection terminals 6A to 6C and the neutral terminal 7.

[0101] Therefore, according to the present embodiment, the power supply connection terminals 6A-6C and the neutral terminal 7 can be insulated from other metal components by the terminal holder 90. In this case, the other metal components are, for example, the winding CL (the first winding U1 to the twelfth winding W2) and the stator core 3.

[0102] Furthermore, since the terminal holder 90 holds the power supply connection terminals 6A to 6C and the neutral terminal 7, the power supply connection terminals 6A to 6C and the neutral terminal 7 can be easily fixed to the stator ST. In other words, by fixing the terminal holder 90 to the stator ST, rather than fixing the terminals individually to the stator ST, the power supply connection terminals 6A to 6C and the neutral terminal 7 can be fixed collectively via the terminal holder 90.

[0103] Specifically, the terminal holder 90 covers the power supply connection terminals 6A to 6C and the neutral point terminal 7. At least one of the current-carrying connection portions 61 and winding connection portion 62 of the power supply connection terminals 6A to 6C and the first neutral point connection portion 71, second neutral point connection portion 72, and third neutral point connection portion 73 of the neutral point terminal 7 is partially exposed from the terminal holder 90. In this embodiment, the current-carrying connection portions 61 and winding connection portion 62 of the power supply connection terminals 6A to 6C and the first neutral point connection portion 71, second neutral point connection portion 72, and third neutral point connection portion 73 of the neutral point terminal 7 are exposed from the terminal holder 90.

[0104] Therefore, according to this embodiment, the power supply connection terminals 6A-6C and the neutral terminal 7 can be easily held in the terminal holder 90 by insert molding while realizing the wiring necessary for driving the motor MT. For example, the terminal holder 90 is a resin molded product into which the power supply connection terminals 6A-6C and the neutral terminal 7 are inserted.

[0105] Moreover, in this embodiment, the terminal holder 90 has at least one holder through hole 903 penetrating the terminal holder 90 in the axial direction AD. In the example of FIG. 10, the terminal holder 90 has a plurality of holder through holes 903. According to this embodiment, by providing the holder through hole 903 in the terminal holder 90, air can be released during insert molding, and thus obstruction of the flow of resin due to air can be suppressed. As a result, insufficient filling of resin during insert molding can be avoided. Furthermore, since the resin enters the holder through hole 903, lifting of the terminal holder 90 due to the resin can be suppressed.

[0106] 6, the neutral point wiring portion 74 of the neutral point terminal 7 has a plate shape. In addition, the neutral point wiring portion 74 extends along the circumferential direction CD in the longitudinal direction LD of the neutral point wiring portion 74. In addition, the neutral point wiring portion 74 is disposed facing the axial direction AD in the lateral direction SD of the neutral point wiring portion 74.

[0107] Therefore, according to this embodiment, the neutral point wiring part 74 is easy to bend in a direction perpendicular to the short-side direction SD of the neutral point wiring part 74. By arranging the short-side direction SD of the neutral point wiring part 74 toward the axial direction AD, it is easy to fine-tune the position while bending the neutral point wiring part 74 when attaching the neutral point terminal 7 to the terminal holder 90 or when placing the neutral point terminal 7 in an insert mold.

[0108] Next, a mounting structure of the terminal holder 90 to the insulator 4 will be described with reference to Fig. 4 and Fig. 12. Fig. 12 is a perspective view of the terminal holder 90 as viewed from below. As shown in Fig. 12, the terminal holder 90 further has a claw portion 904, a restricting portion 905, a claw portion 906, and a restricting portion 907.

[0109] The claw portion 904, the restricting portion 905, the claw portion 906, and the restricting portion 907 protrude downward in the axial direction AD from the rear surface 901B of the terminal holder 90. The claw portion 904 has a claw protruding inward in the radial direction RD. The restricting portion 905 is formed of a substantially rectangular parallelepiped member that is substantially perpendicular to each other. The claw portion 906 has a claw protruding inward in the radial direction RD. The restricting portion 907 is formed of a substantially rectangular parallelepiped member.

[0110] The claw portion 904 and the restricting portion 905 are disposed at one end of the terminal holder 90 in the circumferential direction CD, and the claw portion 906 and the restricting portion 907 are disposed at the other end of the terminal holder 90 in the circumferential direction CD.

[0111] On the other hand, as shown in Fig. 4, the insulator 4 further has a claw portion 45, a wall portion 46, and a claw portion 47. The claw portion 45, the wall portion 46, and the claw portion 47 are disposed at an upper end of the insulator 4 in the axial direction AD. The claw portions 45, 47 have claws that protrude outward in the radial direction RD. The wall portion 46 protrudes in the axial direction AD from the upper end of the insulator 4 in the axial direction AD.

[0112] When the terminal holder 90 is fixed to the insulator 4, as shown in Figs. 4 and 12, the claw portion 904 of the terminal holder 90 is engaged with the claw portion 45 of the insulator 4, and the claw portion 906 of the terminal holder 90 is engaged with the claw portion 47 of the insulator 4. As a result, as shown in Fig. 11, the terminal holder 90 is attached to the insulator 4. Also, the restricting portion 905 of the terminal holder 90 contacts the wall portion 46 of the insulator 4 from the circumferential direction CD. In addition, the restricting portion 907 of the terminal holder 90 contacts the claw portion 47 of the insulator 4 from the circumferential direction CD. As a result, movement of the terminal holder 90 in the circumferential direction CD is restricted.

[0113] Next, the casing CS will be described with reference to Fig. 10 and Fig. 13. Fig. 13 is a perspective view showing the casing CS accommodating the stator ST of Fig. 11.

[0114] The casing CS shown in FIG. 13 covers at least the outer surface in the radial direction RD of the stator core 3 shown in FIG. 1 and the terminal holder 90 shown in FIG. 10 with resin.

[0115] The casing CS covers the winding connection part 62, the first neutral point connection part 71, the second neutral point connection part 72, and the third neutral point connection part 73 shown in Fig. 10. Since it is preferable that the winding connection part 62, the first neutral point connection part 71, the second neutral point connection part 72, and the third neutral point connection part 73 are not exposed to water and air, covering them with resin can prevent them from being exposed to water and air. On the other hand, the current-carrying connection parts 61 of the power supply connection terminals 6A to 6C shown in Fig. 10 are exposed from the casing CS. Therefore, current can be easily passed through the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W of the stator ST.

[0116] Moreover, the casing CS covers the winding connection terminals 81A to 81F shown in Fig. 11. Since it is preferable that the winding connection terminals 81A to 81F not come into contact with water and air, covering them with resin can prevent them from being exposed to water and air.

[0117] Specifically, the casing CS has a cylindrical body 200, a plurality of protruding portions 201, and a cover portion 202. The cylindrical body 200 has a substantially cylindrical shape. The plurality of protruding portions 201 are arranged along a circumferential direction CD. The protruding portions 201 protrude inward in a radial direction RD from an inner surface of the cylindrical body 200. The protruding portions 201 also extend upward in an axial direction AD. The cover portion 202 extends in the circumferential direction CD on the inner surface of the cylindrical body 200.

[0118] One of the three protrusions 201 covers the winding connection terminal 81F and the first neutral point connection portion 71 shown in Fig. 11. The other protrusion 201 covers the winding connection terminal 81C and the winding connection portion 62 shown in Fig. 11. The further other protrusion 201 covers the winding connection terminal 81B and the winding connection portion 62 shown in Fig. 11. In addition, the cover portion 202 covers the winding connection terminal 81E and the second neutral point connection portion 72, the winding connection terminal 81D and the third neutral point connection portion 73, and the winding connection terminal 81A and the winding connection portion 62 shown in Fig. 11.

[0119] 10 and 13, the terminal holder 90 further has a plurality of exposed portions 910. The exposed portions 910 are exposed from the casing CS toward the axial direction AD. Therefore, according to this embodiment, when the stator ST is insert molded, the exposed portions 910 of the terminal holder 90 are pressed by an insert molding die, thereby preventing the terminal holder 90 from floating up.

[0120] Next, the mounting structure of the board SB will be described with reference to Fig. 10 and Fig. 14. As shown in Fig. 10, the terminal holder 90 further has a board fixing portion 902. The board fixing portion 902 protrudes upward in the axial direction AD from a surface 901A of the terminal holder 90. The board fixing portion 902 has a claw protruding in the circumferential direction CD. Furthermore, as shown in Fig. 11, the insulator 4 has a board fixing portion 49. The board fixing portion 49 protrudes upward in the axial direction AD from an upper end of the insulator 4. The board fixing portion 49 has a claw protruding in the circumferential direction CD.

[0121] As shown in Fig. 13, the substrate fixing portion 402 extends in the axial direction AD and protrudes from the casing CS. The substrate fixing portion 49 shown in Fig. 11 also protrudes in the axial direction AD from the casing CS.

[0122] Fig. 14 is a perspective view showing the casing CS accommodating the stator ST and the substrate SB. As shown in Fig. 14, a substrate fixing portion 902 and a substrate fixing portion 49 fix the substrate SB to the stator ST. According to the present embodiment, it is possible to reduce the number of parts and the number of assembly steps, compared to a case in which a substrate fixing member for fixing the substrate SB is provided separately from the terminal holder 90 and the insulator 4.

[0123] In the example of FIG. 14, the substrate fixing portion 902 and the substrate fixing portion 49 attach the substrate SB to the casing CS, thereby fixing the substrate SB to the stator ST.

[0124] Specifically, the substrate fixing portion 902 is coupled to a recess SB1 of the substrate SB. Furthermore, the substrate fixing portion 49 is coupled to a recess SB2 of the substrate SB. As a result, the substrate SB is fixed to the stator ST. Note that the recesses SB1 and SB2 are depressions in the substrate SB in the circumferential direction CD.

[0125] Next, a method for manufacturing the stator ST will be described with reference to Fig. 15 to Fig. 17. Fig. 15 is a flowchart showing the method for manufacturing the stator ST. As shown in Fig. 15, the method for manufacturing the stator ST includes a first step S1 to a sixth step S6.

[0126] First, in a first step S1, a stator core 3 is prepared in which the first teeth T1, the second teeth T2, the third teeth T3, the fourth teeth T4, the fifth teeth T5, the sixth teeth T6, the seventh teeth T7, the eighth teeth T8, the ninth teeth T9, the tenth teeth T10, the eleventh teeth T11, and the twelfth teeth T12 are linearly arranged in this order. Then, an insulator 4 is formed on the stator core 3.

[0127] Specifically, the first step S1 includes steps S11 and S12. In step S11, the stator core 3 having the first tooth T1 to the twelfth tooth T12 linearly arranged in this order is prepared. In step S12, the insulator 4 is formed on the stator core 3.

[0128] FIG. 16 is a plan view showing the stator core after the first step S1 is completed. As shown in FIG. 16, the stator core 3 on which the insulator 4 is formed extends linearly. FIG. 16 also shows a winding machine 100. The winding machine 100 forms a U-phase winding group 5U, a V-phase winding group 5V, and a W-phase winding group 5W by winding the first conductor 51 to the third conductor 53 (FIG. 3) around the first tooth T1 to the twelfth tooth T12. The winding machine 100 has a motor 101, a nozzle NZ1, a nozzle NZ2, and a nozzle NZ3. The nozzle NZ1 outputs the first conductor 51 for forming the U-phase winding group 5U. The nozzle NZ2 outputs the second conductor 52 for forming the V-phase winding group 5V. The nozzle NZ3 outputs the third conductor 53 for forming the W-phase winding group 5W. The motor 101 drives the nozzles NZ1 to NZ3.

[0129] As shown in Figures 15 and 16, after the first step S1, in the second step S2, the winding machine 100 winds the first conductive wire 51 around the first tooth T1 via the insulator 4, winds the second conductive wire 52 around the third tooth T3 via the insulator 4, and winds the third conductive wire 53 around the fifth tooth T5 via the insulator 4.

[0130] After the second step S2, in a third step S3, the winding machine 100 winds the first conductive wire 51 around the eighth tooth T8 via the insulator 4, winds the second conductive wire 52 around the tenth tooth T10 via the insulator 4, and winds the third conductive wire 53 around the twelfth tooth T12 via the insulator 4.

[0131] After the third step S3, in a fourth step S4, the winding machine 100 winds the first conductive wire 51 around the seventh tooth T7 via the insulator 4, winds the second conductive wire 52 around the ninth tooth T9 via the insulator 4, and winds the third conductive wire 53 around the eleventh tooth T11 via the insulator 4.

[0132] After the fourth step S4, in a fifth step S5, the winding machine 100 winds the first conductive wire 51 around the second tooth T2 via the insulator 4, winds the second conductive wire 52 around the fourth tooth T4 via the insulator 4, and winds the third conductive wire 53 around the sixth tooth T6 via the insulator 4.

[0133] Particularly in this embodiment, in the second step S2 and the third step S3, the first conducting wire 51, the second conducting wire 52, and the third conducting wire 53 are wound in a first direction D1. In addition, in the fourth step S4 and the fifth step S5, the first conducting wire 51, the second conducting wire 52, and the third conducting wire 53 are wound in a second direction D2 opposite to the first direction D1.

[0134] Therefore, according to this embodiment, in a 10-pole or 14-pole 12-slot structure, the three phases, U, V, and W, can be simultaneously wound in the same direction. Therefore, the winding time can be shortened. In addition, six locations, namely, the neutral point terminal wire 5US and the current terminal wire 5VS of the first conductor 51, the neutral point terminal wire 5VE and the current terminal wire 5VS of the second conductor 52, and the neutral point terminal wire 5WS and the current terminal wire 5WE of the third conductor 53, can be consolidated. As a result, the size of the board SB connected to the neutral point terminal wire 5US, the current terminal wire 5VS, the neutral point terminal wire 5VE, the current terminal wire 5VS, the neutral point terminal wire 5WS, and the current terminal wire 5WE can be prevented from increasing. Therefore, the constraints on the shape of the motor MT can be suppressed.

[0135] After the fifth step S5, in a sixth step S6, the stator core 3 arranged in a straight line is bent to form the stator core 3 into an annular shape. In this case, the stator core 3 is provided with the insulator 4, the U-phase winding group 5U, the V-phase winding group 5V, and the W-phase winding group 5W. FIG. 17 is a plan view showing the stator core 3 when the stator core 3 is formed into an annular shape. As shown in FIG. 17, the stator core 3 is formed into an annular shape, and one end and the other end of the stator core 3 are joined to manufacture the stator ST. In this case, the "joining" is performed by, for example, welding, metal screws, or hooks.

[0136] The above describes the embodiments of the present invention (including modified examples) with reference to the drawings. However, the present invention is not limited to the above embodiments, and can be implemented in various aspects without departing from the gist of the present invention. In addition, various inventions can be formed by appropriately combining multiple components disclosed in the above embodiments. For example, some components may be deleted from all components shown in the embodiments. For example, components across different embodiments may be appropriately combined. The drawings are mainly schematic illustrations of each component for ease of understanding, and the thickness, length, number, spacing, etc. of each component shown in the drawings may differ from the actual ones due to the convenience of drawing. In addition, the material, shape, dimensions, etc. of each component shown in the above embodiments are merely examples and are not particularly limited, and various modifications are possible within a range that does not substantially deviate from the effects of the present invention. [Industrial Applicability]

[0137] The present invention can be used, for example, in a stator, a motor, and a method for manufacturing a stator. [Explanation of symbols]

[0138] 3 Stator core 4 Insulator 5U U-phase winding group (first phase winding group) 5V V-phase winding group (2nd phase winding group) 5W W-phase winding group (3rd phase winding group) 6, 6A, 6B, 6C Power connection terminals 7 Neutral terminal 31 Coreback 42A~42F Terminal block 43 Crossover Wire Arrangement Section 61 Electrical connection 62 Winding connection 63 Wiring section 71 First neutral point connection 72 Second neutral point connection 73 Third neutral point connection 74 Neutral point wiring section 81A~81F Winding connection terminals 90 Terminal holder 902 Board fixing part 910 Exposed part CS Casing (molded resin part) MT motor RT Rotor ST Stator T1~T12 1st teeth~12th teeth U1 First winding U4 2nd winding V1 3rd winding V4 4th winding W1 5th winding W4 Winding No. 6 U3 7th winding U2 Winding No. 8 V3 Winding No. 9 V2 Winding 10 W3 Winding No. 11 W2 Winding No. 12

Claims

1. a stator core disposed around a central axis extending in a vertical direction; an insulator covering at least a portion of the stator core; a first phase winding group including a plurality of windings each including a first conducting wire wound around the stator core via the insulator; a second phase winding group including a plurality of windings each including a second conducting wire wound around the stator core via the insulator; a third-phase winding group formed of a plurality of windings each having a third conducting wire wound around the stator core via the insulator; having The stator core is A core back disposed annularly around a central axis; First teeth extending radially from the core back; second teeth extending radially from the core back; third teeth extending radially from the core back; a fourth tooth extending radially from the core back; fifth teeth extending radially from the core back; sixth teeth extending radially from the core back; seventh teeth extending radially from the core back; an eighth tooth extending radially from the core back; a ninth tooth extending radially from the core back; a tenth tooth extending radially from the core back; an eleventh tooth extending radially from the core back; a twelfth tooth extending radially from the core back; having the first teeth, the second teeth, the third teeth, the fourth teeth, the fifth teeth, the sixth teeth, the seventh teeth, the eighth teeth, the ninth teeth, the tenth teeth, the eleventh teeth, and the twelfth teeth are arranged in this order in a circumferential direction, one circumferential end of the core back from which the first tooth extends and another circumferential end of the core back from which the twelfth tooth extends are coupled to each other, the first phase winding group includes a first winding wound around the first tooth in a first direction via the insulator, a second winding wound around the second tooth in a second direction opposite to the first direction via the insulator, a seventh winding wound around the seventh tooth in the second direction via the insulator, and an eighth winding wound around the eighth tooth in the first direction via the insulator, the second phase winding group includes a third winding wound in a first direction around the third tooth via the insulator, a fourth winding wound in a second direction around the fourth tooth via the insulator, a ninth winding wound in the second direction around the ninth tooth via the insulator, and a tenth winding wound in the first direction around the tenth tooth via the insulator, the third phase winding group includes a fifth winding wound in a first direction around the fifth tooth via the insulator, a sixth winding wound in a second direction around the sixth tooth via the insulator, an eleventh winding wound in the second direction around the eleventh tooth via the insulator, and a twelfth winding wound in the first direction around the twelfth tooth via the insulator, In the first phase winding group, the first winding and the eighth winding are connected, the eighth winding and the seventh winding are connected, and the seventh winding and the second winding are connected, In the second phase winding group, the third winding and the tenth winding are connected, the tenth winding and the ninth winding are connected, and the ninth winding and the fourth winding are connected, In the third phase winding group, the fifth winding and the twelfth winding are connected to each other, the twelfth winding and the eleventh winding are connected to each other, and the eleventh winding and the sixth winding are connected to each other. one end wire of the first phase winding group is located on the first tooth, one end wire of the second phase winding group is located on the third tooth, and one end wire of the third phase winding group is located on the fifth tooth, the other terminal wire of the first phase winding group is located on the second tooth, the other terminal wire of the second phase winding group is located on the fourth tooth, and the other terminal wire of the third phase winding group is located on the sixth tooth, one end wire of the first phase winding group is located on the first tooth, one end wire of the second phase winding group is located on the third tooth, and one end wire of the third phase winding group is located on the fifth tooth, a second terminal wire of the first phase winding group located on the second tooth, a second terminal wire of the second phase winding group located on the fourth tooth, and a second terminal wire of the third phase winding group located on the sixth tooth.

2. a power supply connection terminal that electrically connects any one of the first to third phase winding groups to a current carrying line that carries current to the winding group, The power supply connection terminal is An electric connection part that is connected to the electric wire; a winding connection portion that is directly or indirectly connected to a current-carrying terminal wire that is one of the first terminal wire and the second terminal wire of the winding group; a wiring portion connecting the current-carrying connection portion and the winding connection portion; having The stator according to claim 1 , wherein the wiring portion is disposed across two or more consecutive teeth from the first tooth to the twelfth tooth while being spaced apart from the first tooth to the twelfth tooth.

3. The conductive connection portion, the wiring portion, and the winding connection portion are configured as a single member.

3. The stator according to claim 2.

4. a neutral terminal electrically connecting a neutral terminal wire which is one of the one terminal wire and the other terminal wire of the first phase winding group, a neutral terminal wire which is one of the one terminal wire and the other terminal wire of the second phase winding group, and a neutral terminal wire which is one of the one terminal wire and the other terminal wire of the third phase winding group, 2 . The stator according to claim 1 , wherein the neutral terminal is disposed across two or more consecutive teeth from the first tooth to the twelfth tooth while being spaced apart from the first tooth to the twelfth tooth.

5. The neutral terminal is a first neutral point connection portion connected to the neutral point terminal wire of the first phase winding group; a second neutral point connection portion connected to the neutral point terminal wire of the second phase winding group; a third neutral point connection portion connected to the neutral point terminal wire of the third phase winding group; a neutral point wiring portion connecting the first neutral point connection portion, the second neutral point connection portion, and the third neutral point connection portion; having The stator according to claim 4 , wherein the first neutral point connection portion, the second neutral point connection portion, the third neutral point connection portion and the neutral point wiring portion are configured as a single member.

6. a neutral terminal electrically connecting a neutral terminal wire which is either one of the one terminal wire and the other terminal wire of the first phase winding group, a neutral terminal wire which is either one of the one terminal wire and the other terminal wire of the second phase winding group, and a neutral terminal wire which is either one of the one terminal wire and the other terminal wire of the third phase winding group; a power supply connection terminal that electrically connects any one of the first to third phase winding groups to a current carrying wire that carries current to the winding group; and The power supply connection terminal is An electric connection part that is connected to the electric wire; a winding connection portion that is directly or indirectly connected to a current-carrying terminal wire that is one of the first terminal wire and the second terminal wire of the winding group; a wiring portion connecting the current-carrying connection portion and the winding connection portion; having The neutral terminal is a first neutral point connection portion connected to the neutral point terminal wire of the first phase winding group; a second neutral point connection portion connected to the neutral point terminal wire of the second phase winding group; a third neutral point connection portion connected to the neutral point terminal wire of the third phase winding group; a neutral point wiring portion connecting the first neutral point connection portion, the second neutral point connection portion, and the third neutral point connection portion; The stator of claim 1 , comprising:

7. A terminal block and a winding connection terminal extending in an axial direction from the terminal block and connected to any one of the first phase winding group to the third phase winding group; and At least one of the winding connection portion, the first neutral point connection portion, the second neutral point connection portion, and the third neutral point connection portion has a flat portion extending in a direction intersecting with an axial direction, The flat portion has a through hole penetrating in the axial direction or a notch cut in a direction intersecting the axial direction, The winding connection terminal passes through the through hole or the inside of the notch in the axial direction, 7. The stator according to claim 6, wherein one of the axially opposite faces of the flat portion opposite the face on the terminal block side is electrically connected to the winding connection terminal via solder.

8. The winding connection terminal is a pin extending in the axial direction, The stator according to claim 7 , wherein the current-carrying terminal wire or the neutral point terminal wire is electrically connected to the winding connection terminal via solder in a state where the current-carrying terminal wire or the neutral point terminal wire is wound around the winding connection terminal.

9. 9. The stator according to claim 8, wherein an inner diameter of the through hole is larger than a diameter of the current-carrying terminal wire or the neutral point terminal wire wound around the winding connection terminal.

10. a terminal holder that is made of an electrical insulator and that holds at least one of the power supply connection terminal and the neutral terminal; The stator according to claim 6 , wherein the terminal holder is fixed to the insulator.

11. The terminal holder covers the terminal, The stator according to claim 10, wherein at least one of the conductive connection portion, the winding connection portion, the first neutral point connection portion, the second neutral point connection portion, and the third neutral point connection portion has a portion of a terminal exposed from the terminal holder.

12. 12. The stator according to claim 10, wherein the neutral point wiring portion of the neutral point terminal is plate-shaped, extends circumferentially in the longitudinal direction of the neutral point wiring portion, and is arranged facing the axial direction in the short direction of the neutral point wiring portion.

13. The stator according to claim 12 , wherein the neutral wiring portion of the neutral terminal is disposed at a radially offset position with respect to the winding.

14. The stator according to claim 13 , wherein the wiring portion of the power supply connection terminal is disposed axially apart from the winding.

15. each of the first phase winding group, the second phase winding group, and the third phase winding group has a crossover wire connecting the windings to each other; the insulator has a jumper arrangement portion in which a jumper of the winding is arranged, the crossover wire is wired across two or more teeth from the first tooth to the twelfth tooth, The stator according to claim 14 , wherein the crossover arrangement portion is located axially opposite to the power supply connection terminal and the neutral terminal across the stator core.

16. A stator according to any one of claims 10 to 15; A rotor disposed radially inward of the stator; a molded resin portion that covers at least the radial outer surface of the stator core and the terminal holder with resin; having the molded resin portion covers the winding connection portion, the first neutral point connection portion, the second neutral point connection portion, and the third neutral point connection portion; The motor, wherein the conductive connection portion of the power supply connection terminal is exposed from the molded resin portion.

17. the terminal holder has a board fixing portion for fixing a board, The motor according to claim 16 , wherein the board fixing portion extends in the axial direction and protrudes from the molded resin portion.

18. The motor according to claim 16 or 17, wherein the terminal holder has a holder through-hole that penetrates therethrough in the axial direction.

19. The motor according to claim 16 , wherein the terminal holder has an exposed portion that is exposed in the axial direction from the molded resin portion.

20. A method for manufacturing a stator, comprising the steps of: The stator includes a stator core and an insulator that covers at least a portion of the stator core. the stator core has first teeth, second teeth, third teeth, fourth teeth, fifth teeth, sixth teeth, seventh teeth, eighth teeth, ninth teeth, tenth teeth, eleventh teeth, and twelfth teeth, a first step of preparing the stator core, the stator core being linearly arranged in the order of the first teeth, the second teeth, the third teeth, the fourth teeth, the fifth teeth, the sixth teeth, the seventh teeth, the eighth teeth, the ninth teeth, the tenth teeth, the eleventh teeth, and the twelfth teeth; a second step of winding a first conducting wire around the first tooth via the insulator, a second conducting wire around the third tooth via the insulator, and a third conducting wire around the fifth tooth via the insulator; a third step of winding the first conducting wire around the eighth tooth via the insulator, winding the second conducting wire around the tenth tooth via the insulator, and winding the third conducting wire around the twelfth tooth via the insulator after the second step; a fourth step of winding the first conducting wire around the seventh tooth via the insulator, winding the second conducting wire around the ninth tooth via the insulator, and winding the third conducting wire around the eleventh tooth via the insulator after the third step; a fifth step, which is performed after the fourth step, of winding the first conducting wire around the second tooth via the insulator, winding the second conducting wire around the fourth tooth via the insulator, and winding the third conducting wire around the sixth tooth via the insulator; a sixth step of bending the stator core arranged in a straight line after the fifth step, and joining one circumferential end of the core back from which the first teeth extend and the other circumferential end of the core back from which the twelfth teeth extend to each other, thereby forming the stator core into an annular shape; Including, In the second step and the third step, the first conducting wire, the second conducting wire, and the third conducting wire are wound in a first direction; A method for manufacturing a stator, wherein in the fourth and fifth steps, the first conducting wire, the second conducting wire, and the third conducting wire are wound in a second direction opposite to the first direction.

Images