Motor, stator

Abstract

To enhance productivity by facilitating the arrangement of electric wires used for coils in a motor. The motor (1) which has a connecting part (26) that mutually connects a plurality of electric wires (25) between an end part (251) and a coil part (252), includes: a stator (2) having a stator core (21) with a plurality of teeth (24) in a circumferential direction, and a coil (22) configured by winding a plurality of electric wires (25) around the plurality of teeth (24), the number of electric wires (25) corresponding to the number of phases, which is two or more; a rotating shaft (3) rotatably provided with respect to the stator core (21); a rotor (6) fixed to the rotating shaft (3); and a permanent magnet (61) fixed to the rotor (6); wherein the plurality of electric wires (25) each have an end part (251) connected to a circuit board configured of a base plate (8), or a harness connected to a circuit board, and a coil part (252) wound around the plurality of teeth (24).

Description

MOTOR, STATORTECHNICAL FIELD

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

[0002] A known motor structure includes a stator in which a coil is wound around each of a plurality of teeth of an annular stator core, a rotor that supports a permanent magnet on the outer periphery of the stator and is rotatable via a bearing and a rotating shaft, and a plate through which the rotating shaft passes and that is fixed to the stator so as to be rotatable. The coil is connected to a controller mounted on a printed circuit board supported by the plate, and the excitation current is switched.

[0003] Incidentally, in a motor, coils of the same phase are formed by winding a single continuous electric wire around a plurality of teeth, or by connecting electric wires to a plurality of teeth using a bus bar or by fusing (thermal crimping). The end parts of the electric wire constituting each phase are connected to a circuit board or a harness that is connected to the circuit board. Specifically, in a motor having 12 teeth, when winding a single continuous wire around teeth of the same phase to connect 4 series 1 parallel, three wires are used, and the end parts of the electric wires are connected to six points on the circuit board. In addition, in a similar motor, when a single continuous wire is wound around teeth of the same phase to connect 2 series 2 parallel, six wires are used, and the end parts of the electric wires are connected to 12 points on the circuit board (see Patent Document 1 ).RELATED ART DOCUMENTS

[0004] Patent Document 1 : Japanese Unexamined Patent Application 2008- 193889SUMMARY OF THE INVENTION[PROBLEM TO BE SOLVED BY THE INVENTION]

[0005] However, when a single continuous wire is wound around teeth of the same phase and connected in a 4 series 1 parallel configuration, the induced voltage can be increased as compared to a 2 series 2 parallel configuration. However, taking into account the efficiency of the motor (resistance value of the wire), the wire diameter needs to be thicker so providing the electric wire inside the motor becomes difficult.

[0006] On the other hand, when a single continuous wire is wound around teeth of the same phase to connect in 2 series 2 parallel, the resistance between phases is one-fourth of the case when connecting in 4 series 1 parallel, so a thinner wire diameter can be used. However, the number of wires used, and the number of electric wire end parts connected to the circuit board is increased to 12, which creates a problem of increasing production steps.

[0007] Here, a configuration may be adopted in which the number of electric wires is one or three, and the electric 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. However, even with this configuration, there is a problem in that costs increase due to the increase in equipment and processes required to connect the plurality of electric wires to the bus bar or terminals.

[0008] Using the above object as an example, an object of the present invention is to provide technology for facilitating arrangement of electric wires and improving productivity by reducing the number of end parts that connect the electric wires used for the coil of the motor to an electronic board or a harness.MEANS FOR SOLVING THE PROBLEM

[0009] In order to achieve the aforementioned object, the motor of the present invention which has a connecting part that mutually connects a plurality of wires between an end part and a coil part, includes: a stator having a stator core with a plurality of teeth in a circumferential direction, and a coil configured by winding a plurality of electric wires around the plurality of teeth, the number of electric wires corresponding to the number of phases, which is two or more; a rotating shaft rotatably provided with respect to the stator core; a rotor fixed to the rotating shaft; and a field magnet fixed to the rotor; wherein the plurality of electric wires each have an end part connected to a circuit board or a harness connected to a circuit board, and a coil part wound around the plurality of teeth.

[0010] In a motor according to one aspect of the present invention, the connecting part is provided upright on one axial surface of the stator core.

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

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

[0013] In a 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 part is a pressure contact part that removes the coating of each of the plurality of electric wires to electrically connect the electric wires.

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

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

[0016] In the motor according to one aspect of the present invention, there are six end parts, all of which are connected to the circuit board or a harness that is 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 connecting part electrically connects the end part and the coil part to a jumper wire between the coils.

[0018] In a motor according to one aspect of the present invention, there are six end parts, of which only three are connected to the circuit board or a harness that connects to the circuit board, and the remaining three are insulated.

[0019] In order to achieve the aforementioned object, the stator of the present invention which has a connecting part between an end part and a coil part that electrically connects a plurality of electric wires together, includes: a stator core having a plurality of teeth in a circumferential direction; and a coil configured by winding a plurality of electric wires around the plurality of teeth, the number of electric wires corresponding to the number of phases, which is two or more; wherein the plurality of electric wires each have an end part connected to a circuit board or a harness connected to a circuit board, and a coil part wound around the plurality of teeth.EFFECT OF THE INVENTION

[0020] With the motor of the present invention, the number of end parts where the electric wires used for the coils in the motor are connected to an electronic board or harness can be reduced, facilitating the provision of the electric wires and improving productivity.BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG. 1 is a cross-sectional view depicting a schematic configuration of a motor according to an embodiment of the present invention;FIG. 2 is a perspective view depicting a schematic configuration of a stator included in the motor depicted in FIG. 1 ;FIG. 3 is an electrical connection wiring diagram of a stator included in the motor depicted in FIG. 1 ;FIG. 4 is an enlarged perspective view of a connecting part of the stator depicted in FIG. 2;FIG. 5 is a partially enlarged cross-sectional view of the connecting part depicted in FIG. 4;FIG. 6 is a diagram depicting a state in which the pressure contact part is removed from the connecting part depicted in FIG. 4;FIG. 7 is an enlarged perspective view depicting a modified example of a connecting part in a stator included in the motor according to an embodiment of the present invention;FIG. 8 is an electrical connection wiring diagram of a first modified example of the stator included in the motor depicted in FIG. 1 ;FIG. 9 is an electrical connection wiring diagram of a second modified example of the stator included in the motor depicted in FIG. 1 ;FIG. 10 is an electrical connection wiring diagram of a third modified example of the stator included in the motor depicted in FIG. 1 ; andFIG. 11 is an electrical connection wiring diagram of a fourth modified example of the stator provided in the motor depicted in FIG. 1 .EMBODIMENTS OF THE INVENTION

[0022] A motor and a stator provided in the motor according to an embodiment of the present invention will be described below with reference to the drawings.

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

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

[0025] Summary of EmbodimentsAs depicted in FIG. 1 and FIG. 2, a motor 1 according to the present embodiment includes: a stator 2 having a stator core 21 with a plurality of teeth 24 in the circumferential direction and a coil 22 in which a plurality of electric wires 25, the number of which corresponds to the number of phases (2 or more), are wound around the plurality of teeth 24 such that each of the plurality of electric wires 25 constitute a different phase; a rotating shaft 3 provided rotatably relative 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 end parts 251 connected to a circuit board provided on a base plate 8 or a harness connected to the circuit board,and a coil part 252 wound around the plurality of teeth 24. The stator 2 of the motor 1 includes a connecting part 26 between the end part 251 and the coil part 252 for electrically connecting the plurality of electric wires 25 together.

[0026] In the stator 2 of the motor 1 , the connecting part 26 is provided upright on one surface of the stator core 21 in the axial direction.

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

[0028] In the stator 2 of the motor 1 , the end part 251 extends from the connecting part 26 to the radially outer side of the stator 2 and also extends to one side in the axial direction near 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 (referring to a coating made of an insulating material such as enamel or the like; the same applies throughout this specification) 254 on the outer periphery, and the connecting part 26 may be, for example, a pressure contact part that removes the coating 254 of each of the plurality of electric wires 25 and electrically connects the electric wires.

[0030] In the stator 2 of the motor 1 , for example, the connecting part 26 may be electrically connected by fusing each of the plurality of electric wires 25.

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

[0032] The motor 1 has six end parts 251 , all of which are connected to a circuit board or a harness that connects to a circuit board.

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

[0034] The motor 1 has six ends 251 , of which only three are connected to a circuit board or a harness that connects to the circuit board, and the remaining three are insulated end parts 255 that are insulated. The configuration and operation of the motor 1 is described below in detail.

[0035] [Motor configuration]The motor 1 includes a first bearing 4 and a second bearing 5 in addition to the main structural element described above, or in other words, the stator 2, the rotating shaft 3, and the rotor 6. The motor 1 is, for example, an outer rotor type motor, and is a three-phase brushless direct current (DC) motor with a 2 series 2 parallel delta-delta connection.

[0036] The stator 2 includes the stator core 21 and the coils 22 described above, as well as insulators 23, teeth 24, electric wires 25, and connecting part 26.

[0037] The stator core 21 has an outer periphery formed in an annular or approximately annular shape, and a cylindrical bearing retaining hole 20 formed in the inner periphery. The stator core 21 is configured by laminating a plurality of annular thin plates made of a magnetic material such as steel plates or the like. In FIG. 1 and FIG. 2, the thin plates that constitute the stator core 21 are omitted. The coil 22 is configured of teeth 24 and an electric wire 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 to extend radially from the inner periphery to the outer periphery of stator core 21. The number of teeth 24 corresponds to the number of slots of the motor 1 . As depicted in FIG. 2, the stator core 21 is provided with twelve teeth 24. In other words, the motor 1 has three phases and 12 slots. The number of electric wires 25 corresponds to the number of phases of the motor 1 , that is, three electric wires are provided corresponding to the three phases of the motor 1 , namely, the iphase, the V-phase, and the W-phase. The electric wires 25 are wound around each of the plurality of teeth 24 via the insulators 23.

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

[0040] As depicted in FIG. 3, the coils 22 in the stator 2 are arranged repeatedly in order of U-phase, V-phase, and W-phase. Specifically, in the stator 2, the coils 22 include coils 22_1 , 22_4, 22_7, and 22_10 constituting the U-phase, coils 22_2, 22_5, 22_8, and 22_11 constituting the V-phase, and coils 22_3, 22_6, 22_9, and 22_12 constituting the W-phase. The coils 22_1 , 22_4, 22_7, and 22_10 are configured by winding an electric wire 25_1 around the teeth 24. The coils 22_2, 22_5, 22_8, and 22_11 are configured by winding an electric wire 25_2 around the teeth 24. The coils 22_3, 22_6, 22_9, and 22_12 are configured by winding an electric wire 25_3 around the teeth 24. For example, the electric wire 25_1 is wound from the beginning to end in order of coil 22_1 , coil 22_4, coil 22_7, and coil 22_10. For example, the electric wire 25_2 is wound from the beginning to end in order of coil 22_5, coil 22_8, coil 22_11 , and coil 22_2. For example, the electric wire 25_3 is wound from the beginning to end in the order of coil 22_9, coil 22_12, coil 22_3, and coil 22_6. The order in which the electric wire 25 is wound around the teeth 24 is not limited to the example described above. The start and ends of the windings have six end parts 251 , and jumper wires 253 are provided between coils 22_4 and 22_7, between coils 22_8 and 22_11 , and between coils 22_12 and 22_3. The connecting part 26 electrically connects between the end part 251 and the coil 22 to a jumper wire 253. Theend part 251 extends from the connecting part 26 in the radially outward direction of the stator 2 and also extends to one side in the axial direction, in other words, in a direction away from the stator 2 in the axial direction, within the vicinity of the teeth 24, for example, within the range of the region where the coil 22 is wound on the teeth 24. The end parts 251 are connected to the circuit board or a harness that connects to the circuit board.

[0041] FIG. 4 is an enlarged perspective view of the connecting part 26 of the stator 2. FIG. 5 is a partially enlarged cross-sectional view of the connecting part 26. FIG. 6 is a diagram depicting a condition where the pressure contact part 262 is removed from the connecting part 26.

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

[0043] The pressure contact part receiving parts 261 are formed on the flat part 231 in a number corresponding to the number of phases of the motor 1 , or in other words, three. The pressure contact part receiving part 261 has a void that is open upward in FIG. 2 and FIG. 4 to FIG. 6 (downward in FIG. 1 ), and is capable of receiving the pressure contact part 262. The pressure contact part receiving part 261 is provided with a groove part 263, a storage part 264, and a protruding part 266.

[0044] The storage part 264 stores the pressure contact part 262 and the electric wire 25. The groove part 263 is a groove-like portion formed on the longitudinal surface of the pressure contact part receiving part 261 and is open upward in FIG.2, and FIG. 4 to FIG. 6. The groove part 263 allows the electric wire 25 stored inside the storage part 264 to pass through. The protruding part 266 is a protrusion that extends upward from the lower surface of the storage part 264 in FIG. 2 to FIG. 6. The protruding part 266 adjusts the contact position between the electric wire 25 housed in the storage part 264 and the pressure contact part 262.

[0045] The pressure contact part 262 is made of a conductive material such as a metal or the like. The pressure contact part 262 has an electric wire contact part 265. The pressure contact part 262 has a shape such that the periphery of the electric wire contact part 265 can be stored in the storage part 264. The electric wire contact part 265 has a width dimension slightly smaller than the outer diameter of the electric wire 25 including the coating 254 so that at least a portion of the coating 254 of each of the plurality of electric wires 25 can be stripped as depicted in FIG. 5 when the electric wires 25 are stored in the pressure contact part receiving part 261 as depicted in FIG. 6, and then the pressure contact part 262 is stored in the storage part 264 as depicted in FIG. 4. The electric wire contact part 265 strips the coating 254 to electrically connect the plurality of electric wires 25 to the pressure contact part 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 contains a circular or approximately circular cylindrical part 62 that covers the outer periphery side of the stator 2 and supports a permanent magnet 61 on the inner periphery, a disk-shaped or approximately disk-shaped top surface part 63 that covers the upper side of the stator 2, and a shaft mounting hole 64 provided at the center of the top surface part 63. The rotor 6 is fixed to the rotating shaft3. Specifically, a first end part 31 of 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 provided in a bearing retaining hole 20 of the stator core 21 . The first bearing 4 and the second bearing 5 are provided side by side in the axial direction in the bearing retaining hole 20. The first bearing 4 and the second bearing 5 rotatably support the rotating shaft 3 relative 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 retaining hole 20. The first bearing 4 and the second bearing 5 rotatably support the rotating shaft 3 relative to the stator core 21. The first bearing 4 and the second bearing 5 are press-fit into the inner circumferential surface of the bearing retaining hole 20 of the stator core 21. The first bearing 4 and the second bearing 5 are provided in the bearing retaining hole 20 separated from each other in the axial direction of the rotating shaft 3.

[0049] The first bearing 4 is one of a pair of bearings included in the motor 1 and is provided on the upper side in the axial direction of the rotating shaft 3. The first bearing 4 is a ball bearing including an inner ring 41 , an outer ring 42, and rolling bodies 43 provided between the inner ring 41 and the outer ring 42.

[0050] The second bearing 5 is one of a pair of bearings included in the motor 1 and is provided on the lower side in the axial direction of the rotating shaft 3. The second bearing 5 is a ball bearing including an inner ring 51 , an outer ring 52, and rolling bodies 53 provided between the inner ring 51 and the outer ring 52.

[0051] Next, operation of the motor 1 having the aforementioned configuration 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 part 251 connected to the circuit board formed on the base plate 8 or a harness connected to the circuit board, and a coil part 252 wound around the plurality of teeth 24. The stator 2 of themotor 1 includes a connecting part 26 that electrically connects the plurality of electric wires 25 together in the range of the jumper wire 253 between the end part 251 and the coil part 252.

[0053] In the motor 1 configured as described above, the wire diameter of the electric wire 25 can be made thinner than a case where a single continuous wire is wound around teeth of the same phase and connected in a 4 series 1 parallel configuration, while the electric wires 25 of the same phase are electrically connected by the connecting part 26, enabling efficiently bundling of the electric wires connected to the circuit board or harness.

[0054] In the motor 1 , when the connecting part 26 is a pressure contact part 262 that removes the coating 254 of each of the plurality of electric wires 25 so as to electrically connect the electric wires, the plurality of electric wires 25 are stored in the pressure contact part receiving part 261 as depicted in FIG. 6, and then the pressure contact part 262 is then stored in the pressure contact part receiving part 261 as depicted in FIG. 4 and FIG. 5, thereby fixing the plurality of electric wires 25 to the stator 2 and removing at least a portion of the coating 254 on the plurality of electric wires 25 so as to electrically connect the electric wires.

[0055] With the motor 1 described above, the electric wires 25 can be fixed and electrically connected to the stator 2 using a simple configuration compared to a case where a plurality of electric wires 25 are connected to a bus bar or terminals, such that equipment and processes are reduced, and thereby costs can be reduced.

[0056] Therefore, with the motor 1 described above, the arrangement of the electric wires 25 used in the coil 22 can be simplified, thereby improving productivity.

[0057] In addition, a person of ordinary skill in the art can appropriately modify the present invention in accordance with conventional knowledge. Thesemodifications are of course included in the scope of the present invention so long as the structure of the present invention is included.

[0058] FIG. 7 is an enlarged perspective view depicting a modified example of a connecting part 26B in the stator 2 included in the motor 1 .

[0059] In the stator 2 of the motor 1 described above, the connecting part 26 has been described as an example in which the plurality of electric wires 25 are electrically connected to one another by the pressure contact part 262, but the present invention is not limited to this case. As depicted in FIG. 7, for example, the connecting part 26B may be formed by fusing (thermal crimping) the plurality of electric wires 25 together with a fusing member 267, thereby removing the coating 254 and electrically connecting the electric wires together.

[0060] The motor 1 described above is an outer rotor type motor, and an example has been described in which the motor is a three-phase brushless direct current (DC) motor with a 2 series 2 parallel delta-delta connection, but the present invention is not limited to this case. For example, the present invention is also applicable to an inner rotor type motor. Furthermore, the plurality of electric wires 25 constituting the coil 22 is not limited to a 2 series 2 parallel system. Furthermore, the coil 22 may be connected in a delta-star connection. Furthermore, the motor of the present invention is not limited to a three-phase motor, but may be applicable to a motor using N electric wires that constitute coils in N phases (where N is a natural number of 2 or more). Furthermore, the motor in the present invention may be an AC motor.

[0061] FIG. 8 to FIG. 11 are electrical connection wiring diagrams of modified examples 1 to 4 of the stator 2 included in the motor 1 . The stator 2 of the motor 1 is not limited to the example of the electrical connection wiring diagram depicted in FIG. 3, and may be wound as depicted in, for example, FIGS. 8 to 11 .

[0062] In the electrical connection wiring diagram of modified example 1 of the stator 2 depicted in FIG. 8, the start and end of the winding have six end parts 251 and six insulated end parts 255, and the connecting part 26 electrically connects between the end parts 251 of the coil 22 and the insulated end parts 255.

[0063] In the electrical connection wiring diagram of modified example 2 of the stator 2 depicted in FIG. 9, the start and end of the winding have three end parts 251 and three insulated end parts 255, and the connecting part 26 electrically connects between the end parts 251 of the coil 22 and the insulated end parts 255.

[0064] In the electrical connection wiring diagram of modified example 3 of the stator 2 depicted in FIG. 10, the start and end of the winding have three end parts 251 and three insulated end parts 255, and jumper wires 253 are provided between the end parts 251 and the insulated end parts 255 of each coil 22. The connecting part 26 electrically connects the jumper wire 253 between the end part 251 and the insulated end part 255 of the coil 22.

[0065] In the electrical connection wiring diagram of the fourth modified example of the stator 2 depicted in FIG. 11 , the start and end of the winding have two end parts 251 , and jumper wires 253 are provided between the end parts 251 and each of the coils 22. The jumper wire 253 crosses over the U, V, and W phases. The connecting part 26 electrically connects the end part 251 of the coil 22 to the jumper wire 253.DESCRIPTION OF CODES

[0066] 1 , 1 B. Motor, 2. Stator, 3. Rotating shaft, 4. First bearing, 5. Second bearing, 6. Rotor, 8. Base plate, 20. Bearing retaining hole, 21. Stator core, 22, 22_1 , 22_2, 22_3, 22_4, 22_5, 22_6, 22. J , 22_8, 22_9, 22_10, 22_11 , 22_12. Coil, 23. Insulator, 24. Teeth, 25, 25_1 , 25_2, 25_3. Electric wire, 26, 26B.Connecting part, 31. First end part, 41 , 51. Inner ring, 42, 52. Outer ring, 43, 53. Rolling body, 61 . Permanent magnet, 62. Cylindrical part, 63. Top surface part, 64. Shaft mounting hole, 231 . Flat part, 251 . End part, 252. Coil part, 253. Jumper wire, 254. Coating, 255. Insulated end part, 261 . Pressure contact part receiving part, 262. Pressure contact part, 263. Groove part, 264. Storage part, 265. Electric wire contact part, 266. Protruding part, 267. Fusing member

Claims

Claims1. A motor having a connecting part that mutually connects a plurality of electric wires between an end part and a coil part, the motor comprising: a stator having a stator core with a plurality of teeth in a circumferential direction, and a coil configured by winding a plurality of electric wires around the plurality of teeth, the number of electric wires corresponding to the number of phases, which is two or more; a rotating shaft rotatably provided with respect to the stator; a rotor fixed to the rotating shaft; and a field magnet fixed to the rotor; wherein the plurality of electric wires each have an end part connected to a circuit board or a harness connected to a circuit board, and a coil part wound around the plurality of teeth.

2. The motor according to claim 1 , wherein the connecting part is provided upright on one surface in the axial direction of the stator core.

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

4. The motor according to claim 1 , wherein the end part extends from the connecting part radially outward from the stator and extends toward one side in the axial direction near the teeth.

5. The motor according to claim 1 , wherein the plurality of electric wires have a coating on an outer periphery, and the connecting part is a pressure contact part that removes the coating of each of the plurality of electric wires and electrically connects the electric wires.

6. The motor according to claim 1 , wherein the connecting part electrically connects the plurality of electric wires by fusing the electric wires.

7. The motor according to claim 1 , wherein the motor is a three-phase brushless DC motor where the number of the plurality of electric wires is three.

8. The motor according to claim 1 , wherein there are six end parts, all of which are connected to the circuit board or to a harness that connects to the circuit board.

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

10. The motor according to claim 1 , wherein there are six end parts, only three of which are connected to the circuit board or a harness that connects to the circuit board, and the other three are insulated.11 . A stator having a connecting part between an end part and a coil part that electrically connects a plurality of electric wires together, comprising: a stator core having a plurality of teeth in a circumferential direction; and a coil configured by winding a plurality of electric wires around the plurality of teeth, the number of electric wires corresponding to the number of phases, which is two or more; wherein the plurality of electric wires each have an end part connected to a circuit board or a harness connected to a circuit board, and a coil part wound around the plurality of teeth.

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