Motor and stator

Abstract

To improve productivity by facilitating arrangement of an electric wire used for a coil in a motor.SOLUTION: A motor 1 includes: a stator 2 having a stator core 21 having a plurality of teeth 24 in a circumferential direction and a coil 22 in which a plurality of electric wires 25 corresponding to the number of phases of two or more are wound around a plurality of teeth 24 and each of the plurality of electric wires 25 constitute a different phase; a rotary shaft 3 disposed to be rotatable with respect to the stator core 21; a rotor 6 fixed to the rotary shaft 3; and a permanent magnet 61 fixed to the rotor 6. In the stator 2, the plurality of electric wires 25 include an end portion 251 connected to a circuit board formed on a base plate 8 or a harness connected to the circuit board, and a coil unit 252 wound around the plurality of teeth 24, and a connection portion 26 that electrically connects the plurality of electric wires 25 to each other between the end portion 251 and the coil unit 252.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] In a motor, there is known a structure having a stator in which coils are wound around each of a plurality of teeth of an annular stator core, a rotor that supports permanent magnets on the outer periphery of the stator and is rotatable via bearings and a rotating shaft, and a plate that rotatably penetrates the rotating shaft and is fixed to the stator. The coils are connected to a controller mounted on a printed circuit board supported by the plate, and the excitation current is switched.

[0003] By the way, in a motor, for coils of the same phase, a single continuous wire is wound around a plurality of teeth, or wires of a plurality of teeth are connected using a bus bar or a husing (thermal caulking). The end portions of the wires constituting each phase are connected to a circuit board or a harness connected to the circuit board. Specifically, in a motor having 12 teeth, when winding a single continuous wire around teeth of the same phase and connecting them in 4 series and 1 parallel, 3 wires are used and the end portions of the wires are connected to 6 locations on the circuit board. Also, in the same motor, when winding a single continuous wire around teeth of the same phase and connecting them in 2 series and 2 parallel, 6 wires are used and the end portions of the wires are connected to 12 locations on the circuit board (see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when winding a single continuous wire around teeth of the same phase and connecting them in a 4-series 1-parallel configuration, although it is possible to increase the induced voltage compared to the case of connecting them in a 2-series 2-parallel configuration, considering the efficiency of the motor (the resistance value of the wire), it is necessary to increase the wire diameter, which poses a problem that it is difficult to arrange the wire inside the motor.

[0006] On the other hand, when winding a single continuous wire around teeth of the same phase and connecting them in a 2-series 2-parallel configuration, although the wire diameter can be made thinner because the resistance value between phases becomes one-fourth of that in the case of connecting them in a 4-series 1-parallel configuration, there is a problem that the number of production steps increases because the number of wires used and the wire ends connected to the circuit board increase to 12.

[0007] Here, a configuration in which the number of wires is one or three, and the wires of the same phase are connected to one bus bar or terminal as described above and then connected to a circuit board or harness can also be adopted. However, even with such a configuration, there is a problem that the cost increases due to an increase in the facilities and processes for connecting a plurality of wires to the bus bar or terminal.

[0008] The present invention takes the above problems as an example, and aims to provide a technology that improves productivity by facilitating the arrangement of wires by reducing the number of ends of the wires used for coils in a motor when connecting them to an electronic board or harness.

Means for Solving the Problems

[0009] To achieve the above object, the motor according to the present invention includes a stator core having a plurality of teeth in the circumferential direction, a stator having coils formed by winding a plurality of electric wires corresponding to two or more phases around the plurality of teeth, a rotating shaft rotatably disposed with respect to the stator core, a rotor fixed to the rotating shaft, and a field magnet fixed to the rotor. The plurality of electric wires have an end portion connected to a circuit board or a harness connected to the circuit board, and a coil portion wound around the plurality of teeth, and a connecting portion for electrically connecting the plurality of electric wires to each other is provided between the end portion and the coil portion.

[0010] In the motor according to one aspect of the present invention, the connecting portion is erected on one surface of the stator core in the axial direction.

[0011] In the motor according to one aspect of the present invention, the connecting portion electrically connects the end portion and the coil portion to a jumper wire between the coils.

[0012] In the motor according to one aspect of the present invention, the end portion extends radially outward from the connecting portion of the stator and extends to one side in the axial direction near the teeth.

[0013] In the motor according to one aspect of the present invention, the plurality of electric wires are provided with a coating on the outer periphery, and the connecting portion is a pressure welding component that removes the coating of each of the plurality of electric wires and electrically connects them.

[0014] In the motor according to one aspect of the present invention, the connecting portion electrically connects each of the plurality of electric wires by fusing them.

[0015] The motor according to one aspect of the present invention is a three-phase brushless DC motor having three of the plurality of electric wires.

[0016] In the motor according to one aspect of the present invention, there are six end portions, and all of them are connected to the circuit board or a harness connected to the circuit board.

[0017] In a motor according to one aspect of the present invention, the plurality of electric wires are connected in parallel, and the connection portion electrically connects between the end portion and the coil portion through a jumper wire between the coils.

[0018] In a motor according to one aspect of the present invention, there are six end portions, and only three of them are connected to the circuit board or a harness connected to the circuit board, and the other three are subjected to insulation treatment.

[0019] To achieve the above object, a stator according to the present invention includes a stator core having a plurality of teeth in the circumferential direction, and a coil formed by winding a plurality of electric wires corresponding to two or more phases around the plurality of teeth. The plurality of electric wires have an end portion connected to a circuit board or a harness connected to the circuit board, and a coil portion wound around the plurality of teeth, and a connection portion for electrically connecting the plurality of electric wires to each other is provided between the end portion and the coil portion.

Advantages of the Invention

[0020] According to the motor of the present invention, by reducing the number of end portions for connecting the electric wires used in the coil to the electronic board or the harness in the motor, the arrangement of the electric wires can be facilitated and the productivity can be improved.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

[0022] Hereinafter, the motor according to the embodiment of the present invention and the stator included in the motor will be described with reference to the drawings.

[0023] FIG. 1 is a cross-sectional view schematically showing the configuration of the motor 1 according to the embodiment of the present invention. FIG. 2 is a perspective view schematically showing the configuration of the stator 2 included in the motor 1.

[0024] In the following description, for convenience, in the direction of the axis x (hereinafter referred to as the "axial direction"), the direction of arrow a is the upper side a, and the direction of arrow b is the lower side b. Also, in the radial direction perpendicular to the axis x, the direction away from the axis x (the direction of arrow c in FIG. 1) is the outer peripheral side c, and the direction toward the axis x (the direction of arrow d in FIG. 1) is the inner peripheral side d. In the following description, for convenience, the direction shown in FIG. 1 is the side surface of the motor 1.

[0025] [Outline of the Embodiment] As shown in FIGS. 1 and 2, the motor 1 according to this embodiment includes a stator core 21 having a plurality of teeth 24 in the circumferential direction, and a stator 2 having a plurality of electric wires 25 wound around the plurality of teeth 24 to form coils 22 having a number corresponding to two or more phases, with each of the plurality of electric wires 25 forming a different phase. It also includes a rotating shaft 3 rotatably arranged with respect to the stator core 21, a rotor 6 fixed to the rotating shaft 3, and a field magnet (permanent magnet 61) fixed to the rotor 6. In the stator 2 of the motor 1, the plurality of electric wires 25 have an end portion 251 connected to a circuit board formed on a base plate 8 or a harness connected to the circuit board, and a coil portion 252 wound around the plurality of teeth 24. The stator 2 of the motor 1 includes a connection portion 26 that electrically connects the plurality of electric wires 25 to each other between the end portion 251 and the coil portion 252.

[0026] In the stator 2 of the motor 1, the connection portion 26 stands on one surface of the stator core 21 in the axial direction.

[0027] In the stator 2 of the motor 1, the connection portion 26 electrically connects the end portion 251 and the coil portion 252 through a jumper wire 253 between the coils 22.

[0028] In the stator 2 of the motor 1, the end portion 251 extends radially outward from the connection portion 26 of the stator 2 and also extends axially on one side in the vicinity of the teeth 24.

[0029] In the stator 2 of the motor 1, for example, the plurality of electric wires 25 are provided with a coating 254 on the outer circumference (referring to the coating by an insulating material such as enamel. The same applies in this specification). For example, the connection portion 26 may be a crimping component that removes the coating 254 of each of the plurality of electric wires 25 and electrically connects them.

[0030] In the stator 2 of the motor 1, for example, the connection portion 26 may electrically connect the plurality of electric wires 25 by fusing each of them.

[0031] The motor 1 is a three-phase brushless DC motor. In the stator 2, for example, the number of the plurality of electric wires 25 may be three.

[0032] In the motor 1, there are six end portions 251, and all of them are connected to a circuit board or a harness connected to the circuit board.

[0033] In the stator 2 of the motor 1, for example, the plurality of electric wires 25 may be connected in parallel, and the connection portion 26 may electrically connect between the end portion 251 and the coil portion 252 with a jumper wire 253 between the coils.

[0034] In the motor 1, there are six end portions 251, and only three of them are connected to a circuit board or a harness connected to the circuit board, and the other three are insulating end portions 255 that are subjected to insulation treatment. Hereinafter, the configuration and operation of the motor 1 will be specifically described.

[0035] [Configuration of the motor] In addition to the stator 2, the rotating shaft 3, and the rotor 6 which are the main components described above, the motor 1 includes a first bearing 4 and a second bearing 5. The motor 1 is, for example, an outer rotor type motor, and is a three-phase brushless DC motor with a delta-delta connection in a 2 series 2 parallel configuration.

[0036] The stator 2 includes, in addition to the stator core 21 and the coil 22 described above, an insulator 23, teeth 24, electric wires 25, and a connection portion 26.

[0037] The stator core 21 has an outer periphery formed in an annular or substantially annular shape, and a cylindrical bearing holding hole 20 is formed in the inner periphery. The stator core 21 is configured by laminating a plurality of thin plates of an annular magnetic material such as a steel plate. In FIGS. 1 and 2, illustration of the thin plates constituting the stator core 21 is omitted. The coil 22 is composed of teeth 24 and electric wires 25. The detailed configuration of the coil 22 will be described later. The insulator 23 is an insulating member attached to the stator core 21. The stator 2 is fixed to the base plate 8. Electronic components constituting a control circuit for controlling the operation of the motor 1 are mounted on the base plate 8.

[0038] A plurality of teeth 24 are provided so as to extend radially from the inner periphery to the outer periphery of the stator core 21. The number of teeth 24 is provided according to the number of slots of the motor 1. As shown in FIG. 2, twelve teeth 24 are provided in the stator core 21. That is, the motor 1 is a three-phase 12-slot motor. The electric wires 25 are provided in a number corresponding to the number of phases of the motor 1, that is, three electric wires 25 are provided corresponding to the three phases of U-phase, V-phase, and W-phase in the motor 1. The electric wires 25 are wound around each of the plurality of teeth 24 via the insulator 23.

[0039] FIG. 3 is a wiring diagram of the electric wires of the stator 2 provided in the motor 1.

[0040] As shown in FIG. 3, in the stator 2, the coils 22 are repeatedly arranged in the order of U-phase, V-phase, and W-phase. Specifically, in the stator 2, the coils 22 include the coils 22_1, 22_4, 22_7, 22_10 that constitute the U-phase, the coils 22_2, 22_5, 22_8, 22_11 that constitute the V-phase, and the coils 22_3, 22_6, 22_9, 22_12 that constitute the W-phase. The coils 22_1, 22_4, 22_7, 22_10 are formed by winding the electric wire 25_1 around the teeth 24. The coils 22_2, 22_5, 22_8, 22_11 are formed by winding the electric wire 25_2 around the teeth 24. The coils 22_3, 22_6, 22_9, 22_12 are formed by winding the electric wire 25_3 around the teeth 24. The electric wire 25_1 is wound, for example, in the order of the coil 22_1, the coil 22_4, the coil 22_7, the coil 22_10 from the start of winding until the end of winding. The electric wire 25_2 is wound, for example, in the order of the coil 22_5, the coil 22_8, the coil 22_11, the coil 22_2 from the start of winding until the end of winding. The electric wire 25_3 is wound, for example, in the order of the coil 22_9, the coil 22_12, the coil 22_3, the coil 22_6 from the start of winding until the end of winding. The winding order of the electric wire 25 around the teeth 24 is not limited to the above example. The start and end of winding are the six end portions 251, and between the coil 22_4 and the coil 22_7, between the coil 22_8 and the coil 22_11, and between the coil 22_12 and the coil 22_3 are the jumper wires 253 respectively. The connection portion 26 electrically connects the end portion 251 and the coil 22 through the jumper wire 253. The end portion 251 extends radially outward from the stator 2 from the connection portion 26, and extends in one axial direction, in other words, in the direction away from the stator 2 in the axial direction, within the vicinity of the teeth 24, for example, within the range where the coil 22 is wound around the teeth 24. The end portions 251 are all connected to the circuit board or the harness connected to the circuit board.

[0041] FIG. 4 is an enlarged perspective view of the connection portion 26 in the stator 2. FIG. 5 is a partially enlarged cross-sectional view of the connection portion 26. FIG. 6 is a view showing the state with the press-contact component 262 removed from the connection portion 26.

[0042] As shown in FIGS. 2 and 4, the connection portion 26 is provided on the flat portion 231 of the insulator 23 on the surface on one side in the axial direction of the stator 2, for example, the surface facing the base plate 8 (the lower side in FIG. 1). The connection portion 26 is provided at a position through which a portion between an end portion 251 connected to a circuit board of the electric wire 25 or a harness connected to the circuit board and a coil portion 252 wound around the teeth 24 passes. The connection portion 26 is provided at a position through which a jumper wire 253, which is a portion straddling different phases of a plurality of coils 22 of the electric wire 25, passes. The connection portion 26 is composed of a crimping component receiving portion 261 and a crimping component 262.

[0043] The crimping component receiving portion 261 is formed in a number corresponding to the number of phases of the motor 1, that is, three, on the flat portion 231. The crimping component receiving portion 261 has a space that is open upward (lower side in FIG. 1) from FIGS. 2, 4 to 6 inside to accommodate the crimping component 262 as needed. The crimping component receiving portion 261 is provided with a groove portion 263, a housing portion 264, and a protrusion portion 266.

[0044] The housing portion 264 houses the crimping component 262 and the electric wire 25. The groove portion 263 is a portion formed in a groove shape that is open upward from FIGS. 2, 4 to 6 on the longitudinal surface of the crimping component receiving portion 261. The groove portion 263 allows the electric wire 25 housed inside the housing portion 264 to pass through. The protrusion portion 266 is a protrusion that extends upward from the lower surface of the housing portion 264 in FIGS. 2 to 6. The protrusion portion 266 adjusts the contact position between the electric wire 25 housed in the housing portion 264 and the crimping component 262.

[0045] The crimping component 262 is made of a conductive material such as metal. The crimping component 262 has a wire contact portion 265. The crimping component 262 has a shape around the wire contact portion 265 that can be accommodated in the accommodating portion 264. As shown in FIG. 6, after the electric wire 25 is accommodated in the crimping component receiving portion 261, when the crimping component 262 is accommodated in the accommodating portion 264 as shown in FIG. 4, at least a part of the covering 254 of each of the plurality of electric wires 25 can be peeled off as shown in FIG. 5. The wire contact portion 265 has a dimension in the width direction that is slightly smaller than the outer diameter of the electric wire 25 including the covering 254. By peeling off the covering 254, the wire contact portion 265 makes an electrical connection between the plurality of electric wires 25 and the crimping component 262.

[0046] The rotor 6 is fixed to the rotating shaft 3 and supports a permanent magnet 61 as a field magnet on the outer periphery of the stator 2. The rotor 6 includes an annular or substantially annular cylindrical portion 62 that covers the outer peripheral side of the stator 2 and supports the permanent magnet 61 on the inner periphery, a disk-shaped or substantially disk-shaped top surface portion 63 that covers the upper side of the stator 2, and a shaft mounting hole 64 provided at the center of the top surface portion 63. The rotor 6 is fixed to the rotating shaft 3. Specifically, one end portion 31 at the upper end in the axial direction of the rotating shaft 3 is mounted in the shaft mounting hole 64 of the rotor 6.

[0047] The rotating shaft 3 is disposed in the bearing holding hole 20 of the stator core 21. The first bearing 4 and the second bearing 5 are arranged side by side in the axial direction in the bearing holding hole 20. The first bearing 4 and the second bearing 5 rotatably support the rotating shaft 3 with respect to the stator core 21.

[0048] The first bearing 4 and the second bearing 5 are a pair of bearings arranged side by side in the axial direction in the bearing holding hole 20. The first bearing 4 and the second bearing 5 rotatably support the rotating shaft 3 with respect to the stator core 21. The first bearing 4 and the second bearing 5 are press-fitted into the inner peripheral surface of the bearing holding hole 20 of the stator core 21. The first bearing 4 and the second bearing 5 are arranged apart from each other in the axial direction of the rotating shaft 3 in the bearing holding hole 20.

[0049] The first bearing 4 is provided above the axis of the rotating shaft 3 among the pair of bearings provided in the motor 1. The first bearing 4 is a ball bearing including a rolling element 43 provided between the inner ring 41 and the outer ring 42 in addition to the inner ring 41 and the outer ring 42.

[0050] The second bearing 5 is provided below the axis of the rotating shaft 3 among the pair of bearings provided in the motor 1. The second bearing 5 is a ball bearing including a rolling element 53 provided between the inner ring 51 and the outer ring 52 in addition to the inner ring 51 and the outer ring 52.

[0051] Next, the operation of the motor 1 having the configuration described above will be described.

[0052] In the stator 2 of the motor 1 described above, the plurality of electric wires 25 constituting the coil 22 have an end 251 connected to a circuit board formed on the base plate 8 or a harness connected to the circuit board, and a coil portion 252 wound around the plurality of teeth 24. The stator 2 of the motor 1 includes a connection portion 26 for electrically connecting the plurality of electric wires 25 to each other within the range of the jumper wire 253 between the end 251 and the coil portion 252.

[0053] In the motor 1 configured as described above, compared with the case of winding the same-phase teeth with a single continuous electric wire and connecting them in 4 series and 1 parallel, while reducing the wire diameter of the electric wire 25, the wires connected to the circuit board or the harness can be efficiently grouped by electrically connecting the electric wires 25 of the same phase by the connection portion 26.

[0054] In the motor 1, when the connection portion 26 is a crimping component 262 that removes the coating 254 of each of the plurality of electric wires 25 and electrically connects them, as shown in FIG. 6, after accommodating the plurality of electric wires 25 in the crimping component receiving portion 261, as shown in FIGS. 4 and 5, by accommodating the crimping component 262 in the crimping component receiving portion 261, the plurality of electric wires 25 can be fixed to the stator 2 and at least a part of the coating 254 of the plurality of electric wires 25 can be stripped and electrically connected.

[0055] According to the motor 1 described above, compared with the case of connecting a plurality of electric wires 25 to a bus bar or a terminal, the fixing and electrical connection of the electric wires 25 to the stator 2 can be achieved with a simple configuration, so that the equipment and processes can be labor-saving and the cost can be reduced.

[0056] Therefore, according to the motor 1 described above, the arrangement of the electric wires 25 used for the coil 22 can be facilitated and the productivity can be improved.

[0057] In addition, those skilled in the art can appropriately modify the present invention in accordance with the conventionally known knowledge. As long as the configuration of the present invention is still provided by such modifications, of course, it is included in the scope of the present invention.

[0058] FIG. 7 is an enlarged perspective view showing a modified example of the connection portion 26B in the stator 2 provided in the motor 1.

[0059] In the stator 2 of the motor 1 described above, the connection portion 26 has been described as an example in which a plurality of electric wires 25 are electrically connected to each other by the crimping component 262, but the present invention is not limited thereto. As shown in FIG. 7, for example, the connection portion 26B may fuse (thermally crimp) a plurality of electric wires 25 to each other by a fusing member 267, thereby stripping the coating 254 and electrically connecting them.

[0060] The motor 1 described above is an outer rotor type motor, and an example of a three-phase brushless DC motor with a delta-delta connection in a 2 series 2 parallel manner has been described, but the present invention is not limited thereto. For example, the present invention is also applicable to an inner rotor type motor. In addition, the plurality of electric wires 25 constituting the coil 22 are not limited to the 2 series 2 parallel manner. Further, the connection of the coil 22 may be a delta-star connection. In addition, the motor in the present invention is not limited to three phases, and is applicable to those using N electric wires (N is a natural number of 2 or more) to form a coil in N phases. Further, the motor in the present invention may be an AC motor.

[0061] Figures 8 to 11 are wiring diagrams of Modification Example 1 to Modification Example 4 of the stator 2 provided in the motor 1. The stator 2 of the motor 1 is not limited to the example of the wiring diagram shown in FIG. 3, and may be wound as shown in FIGS. 8 to 11, for example.

[0062] In the wiring diagram of Modification Example 1 of the stator 2 shown in FIG. 8, the start and end of winding are six end portions 251 and six insulated end portions 255, and the connection portion 26 electrically connects between the end portion 251 of the coil 22 and the insulated end portion 255.

[0063] In the wiring diagram of Modification Example 2 of the stator 2 shown in FIG. 9, the start and end of winding are three end portions 251 and three insulated end portions 255, and the connection portion 26 electrically connects between the end portion 251 of the coil 22 and the insulated end portion 255.

[0064] In the wiring diagram of Modification Example 3 of the stator 2 shown in FIG. 10, the start and end of winding are three end portions 251 and three insulated end portions 255, and jumper wires 253 are respectively provided between the end portion 251 and the insulated end portion 255 of each coil 22. The connection portion 26 electrically connects between the end portion 251 of the coil 22 and the insulated end portion 255 to the jumper wire 253.

[0065] In the wiring diagram of Modification Example 4 of the stator 2 shown in FIG. 11, the start and end of winding are two end portions 251, and jumper wires 253 are respectively provided between the end portion 251 and each coil 22. The jumper wires 253 cross the U, V, and W phases. The connection portion 26 electrically connects between the end portion 251 of the coil 22 and the jumper wire 253.

Explanation of Reference Numerals

[0066] 1, 1B... motor, 2... stator, 3... rotating shaft, 4... first bearing, 5... second bearing, 6... rotor, 8... base plate, 20... bearing holding hole, 21... stator core, 22, 22_1, 22_2, 22_3, 22_4, 22_5, 22_6, 22_7, 22_8, 22_9, 22_10, 22_11, 22_12... coils, 23... insulator, 24... teeth, 25, 25_1, 25_2, 25_3... electric wires, 26, 26B... connection parts, 31... one end part, 41, 51... inner rings, 42, 52... outer rings, 43, 53... rolling elements, 61... permanent magnet, 62... cylindrical part, 63... top surface part, 64... shaft mounting hole, 231... flat surface part, 251... end part, 252... coil part, 253... jumper wire, 254... coating, 255... insulating end part, 261... press-contact part receiving part, 262... press-contact part, 263... groove part, 264... receiving part, 265... electric wire contact part, 266... protrusion part, 267... housing member

Claims

1. A stator core having a plurality of teeth in the circumferential direction, and a stator having a coil formed by winding a plurality of electric wires corresponding to two or more phases around the plurality of teeth, A rotating shaft rotatably disposed with respect to the stator, A rotor fixed to the rotating shaft, A field magnet fixed to the rotor, Comprising: The plurality of electric wires have an end portion connected to a circuit board or a harness connected to the circuit board, and a coil portion wound around the plurality of teeth, A motor comprising a connection portion for electrically connecting the plurality of electric wires to each other between the end portion and the coil portion.

2. The connection portion is erected on one surface of the stator core in the axial direction, The motor according to claim 1.

3. The connection portion electrically connects the end portion and the coil portion to a jumper wire between the coils, The motor according to claim 1.

4. The end portion extends radially outward from the connection portion of the stator and extends to one side in the axial direction near the teeth, The motor according to claim 1.

5. The plurality of electric wires are provided with a coating on the outer periphery, The connection portion is a press-fit component that removes the coating of each of the plurality of electric wires and electrically connects them, The motor according to claim 1.

6. The connection portion electrically connects each of the plurality of electric wires by fusing them, The motor according to claim 1.

7. A three-phase brushless DC motor in which the number of the plurality of electric wires is three, The motor according to claim 1.

8. There are six end portions, each of which is connected to the circuit board or a harness connected to the circuit board, The motor according to claim 1.

9. The plurality of electric wires are connected in parallel, and the connection portion electrically connects the end portion and the coil portion to a jumper wire between the coils, The motor according to claim 1.

10. There are six end portions, only three of which are connected to the circuit board or a harness connected to the circuit board, and the other three are subjected to insulation treatment, The motor according to claim 1.

11. A stator core having a plurality of teeth in the circumferential direction, A coil formed by winding a plurality of electric wires corresponding to two or more phases around the plurality of teeth, Comprising: The plurality of electric wires have an end portion connected to a circuit board or a harness connected to the circuit board, and a coil portion wound around the plurality of teeth. A stator including a connection portion for electrically connecting the plurality of electric wires to each other between the end portion and the coil portion.

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