Motor

Abstract

To provide a motor capable of realizing the minimization of them.SOLUTION: A motor 1 comprises: an insulator 27; a bus bar 36 in an inner side arranged into an inner peripheral part 51 of the insulator 27; and a bus bar 37 on an outer side arranged to an outer peripheral part 52 of the insulator 27.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a motor. [Background technology]

[0002] Patent Document 1 discloses a connection plate for supplying a high current from an external power source connected to a motor to a coil wound around an iron core. The connection plate is disposed above the iron core, for example. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-72739 Summary of the Invention [Problem to be solved by the invention]

[0004] Since the thickness of the connection plate for supplying a high current is large, the volume occupied by the connection plate within the motor tends to be large, which prevents the motor from being made smaller.

[0005] Therefore, an object of the present invention is to provide a motor that can achieve miniaturization. [Means for solving the problem]

[0006] A motor according to one aspect of the present invention includes an insulator, an inner bus bar arranged on an inner periphery of the insulator, and an outer bus bar arranged on an outer periphery of the insulator. [Brief description of the drawings]

[0007] [Figure 1] 1 is a vertical sectional view showing a schematic structure of a motor 1 according to a first embodiment of the present invention. [Diagram 2] 1 is a horizontal cross-sectional view showing a schematic structure of a motor 1 according to a first embodiment of the present invention. [Diagram 3] 2 is a perspective view showing a schematic structure of a stator assembly 25. FIG. [Figure 4] 2 is a partially exploded perspective view showing the schematic structure of a stator assembly 25. FIG. [Diagram 5] 2 is a partially enlarged oblique view of the state in which two insulators 27, an inner bus bar 36, and an outer bus bar 37 are removed from the stator assembly 25. FIG. [Figure 6] 13 is a perspective view showing a schematic structure of a stator assembly 25A according to a modified example. FIG. [Figure 7] 2 is a perspective view showing a schematic structure of an inner bus bar 36 and an outer bus bar 37. FIG. [Figure 8] FIG. 13 is a perspective view showing a schematic structure of a stator assembly 25B according to another modified example. [Figure 9] 13 is a partially exploded perspective view showing, in outline, the structure of a stator assembly 25B according to another modified example. FIG. [Figure 10] 2 is a partially enlarged perspective view of a state in which three insulators 27, an inner bus bar 36, and an outer bus bar 37 are removed from a stator assembly 25B. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] An embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 1 is a vertical sectional view that shows a schematic structure of a motor 1 according to an embodiment of the present invention. Fig. 2 is a horizontal sectional view that shows a schematic structure of a motor 1 according to an embodiment of the present invention. Fig. 1 corresponds to the 1-1 sectional view of Fig. 2 taken along a virtual plane including an axis x that constitutes the rotation axis of the motor 1, and Fig. 2 corresponds to the 2-2 sectional view of Fig. 1 taken along a virtual plane perpendicular to the axis x.

[0009] In the following description of the embodiment of the motor 1, one side in the direction along the axis x is defined as the upper side, and the other side as the lower side. The upper and lower sides defined in the direction of the axis x do not necessarily correspond to the up-down relationship in the direction of gravity. Furthermore, the radial direction of the motor 1 is defined in a direction perpendicular to the axis x. In this radial direction, the side away from the axis x is defined as the outer circumferential side, while the direction approaching the axis x is defined as the inner circumferential side. Furthermore, the circumferential direction of the motor 1 is defined around the axis x. In this circumferential direction, clockwise and counterclockwise are defined around the axis x when the motor 1 is viewed from above.

[0010] As shown in FIGS. 1 and 2, the motor 1 includes a shaft 10 having, for example, an axis x as a central axis. The shaft 10 is rotatably supported by two bearings 12 and 13 fixed to a housing 11. The bearings 12 and 13 are attached between the shaft 10 and the housing 11 by, for example, press fitting. The housing 11 includes, for example, a cylindrical housing body 14 and, for example, a disk-shaped lid 15. The upper end of the housing body 14 is open, while the lower end of the housing body 14 is closed by the housing body 14 having a bottom. The upper end of the housing body 14 is covered and closed by the lid 15. The shaft 10 protrudes to the outside of the housing 11 from an opening 16 formed at the lower end of the housing body 14 and an opening 17 formed in the lid 15.

[0011] A cylindrical rotor core 18, for example, is fixed to the shaft 10 between the bearings 12, 13 in the direction of the axis x. The rotor core 18 is formed of a laminate of a plurality of magnetic bodies stacked in the direction of the axis x. As is clear from FIG. 2, the rotor core 18 includes, for example, a cylindrical inner peripheral portion 19, a cylindrical outer peripheral portion 20, and a plurality of (14 in this example) connection portions 21 connecting the inner peripheral portion 19 and the outer peripheral portion 20. The rotor core 18 is fixed by inserting the shaft 10 into a hole formed in the inner peripheral portion 19 along the axis x. Each connection portion 21 is formed, for example, in the shape of a long, flat plate extending in the radial direction.

[0012] A plurality of magnets 22 (14 in this example) are embedded in the outer peripheral portion 20 of the rotor core 18 close to its outer peripheral surface. The magnets 22 are, for example, permanent magnets. The magnets 22 have, for example, a vertically elongated flat rectangular parallelepiped shape. Each magnet 22 is, for example, fixed in a through hole 23 in the outer peripheral portion 20 extending in the direction of the axis x close to the outer peripheral surface of the rotor core 18. The magnetic poles of the magnets 22 arranged in the circumferential direction are set to N poles and S poles alternately in the circumferential direction. This motor 1 is a so-called embedded magnet (IPM) motor. Furthermore, the rotor core 18 and the magnets 22 form a rotor 24 of the motor 1. In other words, the motor 1 is an inner rotor type motor.

[0013] A stator assembly 25 is accommodated in the housing 11. The stator assembly 25 includes a stator core 26, a plurality of (12 in this example) insulators 27, and a plurality of (12 in this example) coils 28. The stator core 26 includes a cylindrical tubular portion 29 and a plurality of teeth 30. The stator core 26 is fixed to the inner circumferential surface of the housing body 14 of the housing 11 at the outer circumferential surface of the tubular portion 29. The stator core 26 is formed of a laminated body of a magnetic material such as silicon steel plate. Each tooth 30 is separated from the tubular portion 29 at a boundary surface B (see FIG. 2) along the inner circumferential surface of the tubular portion 29, for example. The stator core 26 is a so-called split core. The teeth 30 are fixed to the tubular portion 29 by, for example, an adhesive or welding.

[0014] Each tooth 30 includes a spoke 31 and a magnetic pole portion 32. The spoke 31 extends radially from its outer circumferential end to its inner circumferential end. The magnetic pole portion 32 is continuous with the inner circumferential end of the spoke 31. The magnetic pole portions 32 protrude in opposite circumferential directions from the spoke 31. The inner circumferential surface of the magnetic pole portion 32 of the teeth 30 faces the outer circumferential surface of the outer circumferential portion 20 of the rotor core 18 with a predetermined magnetic gap. A coil 28 is wound around each spoke 31 via an insulator 27. The coil 28 is, for example, a copper wire. The insulator 27 is formed of, for example, a resin material. The insulator 27 arranged between the spoke 31 and the coil 28 insulates the stator core 26 from the coil 28.

[0015] FIG. 3 is a perspective view that shows a schematic structure of the stator assembly 25. FIG. 4 is a partially exploded perspective view that shows a schematic structure of the stator assembly 25. Referring to FIGS. 1, 3, and 4 together, for example, one inner circumferential groove (hereinafter referred to as "inner circumferential groove") 33, for example, a first outer circumferential groove (hereinafter referred to as "first outer circumferential groove") 34, and a second outer circumferential groove (hereinafter referred to as "second outer circumferential groove") 35 are formed on the upper side of the stator assembly 25 by twelve insulators 27 arranged in the circumferential direction. The diameter of the second outer circumferential groove 35 is set to be larger than the diameter of the first outer circumferential groove 34. The inner circumferential groove 33, the first outer circumferential groove 34, and the second outer circumferential groove 35 all extend in a ring shape in the circumferential direction around the axis x.

[0016] The inner peripheral groove 33 is disposed on the inner peripheral side of the coil 28, while the first outer peripheral groove 34 and the second outer peripheral groove 35 are disposed on the outer peripheral side of the coil 28. An inner bus bar (hereinafter referred to as an "inner bus bar") 36 is disposed in the inner peripheral groove 33. An outer bus bar (hereinafter referred to as an "outer bus bar") 37 is disposed in the first outer peripheral groove 34 and the second outer peripheral groove 35. As shown in Figs. 1 and 3, the inner bus bar 36 is electrically connected to the lead wires 28a drawn from each coil 28. Meanwhile, the outer bus bar 37 is also electrically connected to the lead wires 28a drawn from each coil 28. A high current is supplied to the coil 28 by the inner bus bar 36 and the outer bus bar 37. In this embodiment, the lead wires 28a rise from the coil 38 so as to move away from the winding direction of the coil 28, and then extend radially to the inner peripheral side or the inner peripheral side, respectively.

[0017] As shown in FIG. 4, the inner busbar 36 includes a plurality of busbar members (hereinafter referred to as "inner busbar members") 38 arranged on the inside as conductive members. In this example, six inner busbar members 38 are arranged in the circumferential direction. All of the inner busbar members 38 have the same shape. Each inner busbar member 38 includes a main body 39 extending in the circumferential direction, and a pair of connection terminals 40, 40 protruding upward from both ends of the main body 39 in the circumferential direction. The main body 39 is formed in a curved flat plate shape that defines an outer circumferential surface and an inner circumferential surface. Each connection terminal 40 is formed in a flat plate shape that defines an outer circumferential surface and an inner circumferential surface that are continuous with the outer circumferential surface and the inner circumferential surface of the main body 39. Each connection terminal 40 is formed with a recessed groove (recessed groove) 41 that extends from the upper end to the lower end of the connection terminal 40.

[0018] In this embodiment, twelve lead wires 28a are led out from twelve coils 28 to the inner circumferential side. On the other hand, the inner bus bar 36 has six inner bus bar members 38, each having two connection terminals 40, arranged in the circumferential direction. In this way, the inner bus bar 36 provides a total of twelve connection terminals 40. These twelve connection terminals 40 are arranged at equal intervals in the circumferential direction. As shown in FIG. 3, when the inner bus bar 36 is arranged in the inner circumferential groove 33, the connection terminals 40 protrude upward from the upper end of the insulator 27. In this state, the lead wires 28a are received in the recessed grooves 41 of each connection terminal 40, and each lead wire 28a is electrically connected to each connection terminal 40. Note that each connection terminal 40 may be crimped to the lead wire 28a. Furthermore, the lead wires 28a may be soldered to the connection terminals 40.

[0019] Returning to FIG. 4, the outer busbar 37 includes a plurality of busbar members (hereinafter referred to as "outer busbar members") 42 arranged on the outside as conductive members. In this example, three outer busbar members 42 are arranged in the circumferential direction. That is, in this embodiment, the number of the outer busbar members 42 is smaller than the number of the inner busbar members 37. All of the outer busbar members 42 have the same shape. Each of the outer busbar members 42 includes an outer circumferential portion 43 extending in the circumferential direction, an inner circumferential portion 44 extending in the circumferential direction, and a connection portion 45 connecting the outer circumferential portion 43 and the outer circumferential portion 44 to each other. The outer circumferential portion 43 and the outer circumferential portion 44 are formed in a curved flat plate shape that defines the outer circumferential surface and the inner circumferential surface. The outer circumferential portion 43 and the inner circumferential portion 44 are arranged to be offset in the radial direction and the circumferential direction. The diameter of the outer circumferential portion 43 is larger than the diameter of the inner circumferential portion 44. In addition, the outer circumferential portion 43 and the inner circumferential portion 44 do not overlap each other in the radial direction and are located at different positions. The connecting portion 45 extends radially and connects the outer circumferential portion 43 and the inner circumferential portion 44 to each other.

[0020] As shown in FIG. 4, in three circumferentially adjacent first to third outer busbar members 42, at least a portion of the outer circumferential portion 43 of the first outer busbar member 42 overlaps with the inner circumferential portion 44 of the third outer busbar member 42 in the radial direction. At least a portion of the inner circumferential portion 44 of the first outer busbar member 42 overlaps with the outer circumferential portion 43 of the second outer busbar member 42 in the radial direction. Similarly, at least a portion of the inner circumferential portion 44 of the second outer busbar member 42 overlaps with the outer circumferential portion 43 of the third outer busbar member 42 in the radial direction. As shown in FIG. 3, each outer circumferential portion 43 is disposed in the second outer circumferential groove 35 of the insulator 27, while the inner circumferential portion 44 is disposed in the first outer circumferential groove 34 of the insulator 27. In this way, the three outer busbar members 42 are disposed in the first outer circumferential groove 34 and the second outer circumferential groove 35, which is less than three, that is, two.

[0021] Each outer busbar member 42 includes a plurality of connection terminals 46 protruding upward from the outer peripheral portion 43 and the outer peripheral portion 44. Each connection terminal 46 is formed in a flat plate shape that defines an outer peripheral surface and an inner peripheral surface that are continuous with the outer peripheral surface and the inner peripheral surface of the outer peripheral portion 43 and the inner peripheral portion 44. Each connection terminal 46 is formed with a groove 47 that extends from the upper end to the lower end of the connection terminal 46. In this embodiment, twelve lead wires 28a are led out to the outer periphery from the twelve coils 28. Meanwhile, the outer busbar 37 provides a total of twelve connection terminals 46. As shown in FIG. 3, the lead wires 28a are received in the grooves 47 of each connection terminal 46, and each lead wire 28a is electrically connected to each connection terminal 46. As with the connection terminal 40 described above, the connection terminals 46 may be crimped or soldered.

[0022] Further, in this example, each of the outer busbar members 42 has one end, i.e., a connection terminal (hereinafter referred to as "external connection terminal") 48, protruding upward from the inner peripheral portion 44. In this example, the external connection terminal 48 extends radially from the inner peripheral portion 44 to the inner peripheral side, and then bends upward and extends so as to protrude upward. As shown in FIG. 1, each of the external connection terminals 48 protrudes outward from the housing 11 in the direction of the axis x. In this protrusion, an opening (not shown) is formed in the lid 15 of the housing 11. The external connection terminal 48 is electrically connected to an external device (not shown) directly or via another member. Note that both the inner busbar member 38 and the outer busbar member 42 are formed by stamping from a metal material such as copper. Note that the stator assembly 25 forms a stator 49 of the motor 1.

[0023] FIG. 5 is a partially enlarged perspective view of the two insulators 27, the inner bus bar 36, and the outer bus bar 37 taken out of the stator assembly 25. As shown in FIG. 5, each insulator 27 includes a cylindrical portion 50, an inner peripheral portion 51 located on the inner periphery side of the cylindrical portion 50, and an outer peripheral portion 52 located on the outer periphery side of the cylindrical portion 50. The cylindrical portion 50 defines a space for accommodating the spokes 31 therein. The inner peripheral portion 51 and the outer peripheral portion 52 are integrally formed with the cylindrical portion 50. The inner peripheral portion 51 is a flange that extends around the opening on the inner periphery side of the cylindrical portion 50 and generally along a cylindrical surface centered on the axis x. Similarly, the outer peripheral portion 52 is a flange that extends around the opening on the outer periphery side of the cylindrical portion 50 and generally along a cylindrical surface centered on the axis x.

[0024] At the upper end of the inner circumferential portion 51, a first groove 53 is formed extending in the circumferential direction around the axis x. The first grooves 53 are arranged in a line in the circumferential direction to form the inner circumferential groove 33 described above. A predetermined gap G1 is formed between two first grooves 53 adjacent in the circumferential direction. In this embodiment, one inner busbar member 38 is disposed across the first grooves 53 of two insulators 27 adjacent in the circumferential direction. The connection terminals 40 of the inner busbar member 38 are disposed at both ends in the circumferential direction of the main body 39, so that the connection terminals 40 are disposed at the circumferential centers of the first grooves 53 of each insulator 27. In this example, the main body 39 is accommodated in the first groove 53, while the connection terminals 40 protrude upward from the first groove 53.

[0025] As is clear from Fig. 5, a protrusion (convex) 54 is formed on the inner peripheral surface of the main body 39 of the inner busbar member 38 at the center of the main body 39 in the circumferential direction. For example, this protrusion 54 extends long in the circumferential direction and protrudes inward from the inner peripheral surface of the main body 39. The circumferential length of the protrusion 54 corresponds to the gap G1 between two insulators 27 adjacent in the circumferential direction, for example. With this protrusion 54, when the inner busbar member 38 is disposed in the inner circumferential groove 33, the protrusion 54 is positioned at the position of the gap G1, so that the inner busbar member 38 can be easily positioned with respect to the inner circumferential groove 33. In other words, the connection terminal 40 can be easily positioned at the center of the first groove 53 of the insulator 27 in the circumferential direction.

[0026] At the upper end of the outer peripheral portion 52, a second groove 55 and a third groove 56 are formed, which extend in the circumferential direction around the axis x. The second groove 55 and the third groove 56 are arranged side by side in the radial direction. The third groove 56 is arranged on the outer peripheral side of the second groove 55. The second grooves 55 are arranged side by side in the circumferential direction to form the first outer peripheral groove 34 described above. Similarly, the third grooves 56 are arranged side by side in the circumferential direction to form the second outer peripheral groove 35 described above. A predetermined gap G2 is formed between the two second grooves 55 and the two third grooves 56 adjacent to each other in the circumferential direction. In this embodiment, the connection portion 45 of the outer busbar member 42 is arranged in this gap G2. As shown in FIG. 3 and FIG. 4, the outer peripheral portion 43 is arranged across, for example, four second outer peripheral grooves 35. Similarly, the inner peripheral portion 44 is arranged across, for example, four first outer peripheral grooves 34.

[0027] In the motor 1 as described above, the inner bus bar 36 is disposed on the inner peripheral portion 50 of the insulator 27 on the inner peripheral side of the coils 28, and the outer bus bar 37 is disposed on the outer peripheral portion 52 of the insulator 27 on the outer peripheral side of the coils 28. For example, the height of the stator assembly 25 can be significantly reduced compared to a case in which the bus bar is disposed above the coils 28. The outer shape of the housing 11 can be reduced by the reduced height. As a result, the motor 1 can be made more compact. Furthermore, according to the motor 1, since the inner bus bar 36 and the outer bus bar 37 are disposed on the insulator 27, there is no need for an insulating sheet for insulating the bus bars from each other, a case for housing the bus bars, or the like. The number of parts of the motor 1 can be reduced.

[0028] Fig. 6 is a perspective view showing a schematic structure of a stator assembly 25A according to a modified example. Fig. 7 is a perspective view showing a schematic structure of an inner bus bar 36 and an outer bus bar 37 arranged on an insulator 27 of the stator assembly 25A. As shown in Figs. 6 and 7, in this stator assembly 25A, the shapes of a connection terminal 40 of an inner bus bar member 38 and a connection terminal 46 of an outer bus bar member 42 are different from the shapes of the connection terminals 40 and 46 of the stator assembly 25 described above. Since the components other than the connection terminals 40 and 46 are the same as the components of the stator assembly 25 of the embodiment described above, they are denoted by the same reference numerals and a duplicated description will be omitted here.

[0029] Specifically, each connection terminal 40 includes a portion 60 (hereinafter referred to as the "inner piece") protruding upward from the main body 39, a portion 61 (hereinafter referred to as the "outer piece") defining an inner circumferential surface facing the outer circumferential surface of the inner piece 60, and a portion 62 (hereinafter referred to as the "connection piece") connecting the inner piece 60 and the outer piece 61 to each other. The inner piece 60 and the outer piece 61 are formed with grooves 63 and 64 extending from the upper end to the lower end of the inner piece 60 and the outer piece 61, respectively. The grooves 63 and 64 are aligned in the radial direction. The lead wire 28a of the coil 28 is disposed in the grooves 63 and 64 of the inner piece 60 and the outer piece 61 and is electrically connected to the connection terminal 40. The lead wire 28a and the connection terminal 40 may be connected by crimping the lead wire 28a, the inner piece 60, and the outer piece 61 by, for example, fusing processing.

[0030] Similarly, the connection terminal 46 includes a portion (hereinafter referred to as the "outer piece") 65 that protrudes upward from the outer peripheral portion 43 or the inner peripheral portion 44, a portion (hereinafter referred to as the "inner piece") 66 that defines an outer peripheral surface facing the inner peripheral surface of the outer piece 65, and a portion (hereinafter referred to as the "connection piece") 67 that connects the outer piece 65 and the inner piece 66 to each other. The outer piece 65 and the inner piece 66 are formed with grooves 68, 69 that extend from the upper end to the lower end of the outer piece 65 and the inner piece 66, respectively. The grooves 68, 69 are aligned in the radial direction. The lead wire 28a of the coil 28 is disposed in the grooves 69, 68 of the inner piece 66 and the outer piece 65 and is electrically connected to the connection terminal 46. The lead wire 28a and the connection terminal 46 may be connected by crimping the lead wire 28a, the outer piece 65, and the inner piece 66 by, for example, fusing processing.

[0031] FIG. 8 is a perspective view that shows a schematic structure of a stator assembly 25B according to another modified example. FIG. 9 is a partially exploded perspective view that shows a schematic structure of a stator assembly 25B according to another modified example. This stator assembly 25B is a modified example of the stator assembly 25 described above. In the stator assembly 25B, the lead wires 28a of the coils 28 are electrically connected to the inner bus bar 36 and the outer bus bar 37 in the gaps G1 and G2 between two insulators 27 that are adjacent to each other in the circumferential direction on both the inner and outer circumferential sides of the coils 28. Other configurations similar to those of the stator assembly 25 described above are denoted by the same reference symbols, and duplicated explanations will be omitted here.

[0032] Fig. 10 is a partially enlarged perspective view of the state in which the three insulators 27, the inner bus bar 36, and the outer bus bar 37 are removed from the stator assembly 25B. Referring to Figs. 8 to 10 together, the numbers of coils 28, lead wires 28a, inner bus bar members 38, outer bus bar members 42, inner circumferential grooves 33, first outer circumferential grooves 34, and second outer circumferential grooves 35 are the same as those in the above-mentioned embodiment. However, as will be described later, the shapes of the inner bus bar members 38 and the outer bus bar members 42 have parts different from those in the above-mentioned embodiment. Also, the lead positions of the lead wires 28a slightly differ from those in the above-mentioned embodiment in that the lead wires 28a are led into the gaps G1 and G2.

[0033] The inner busbar member 38 has a structure similar to that of the embodiment described above, but is disposed at a different position in the circumferential direction from that of the embodiment described above. Specifically, the inner busbar member 38 is disposed across three first grooves 53 adjacent in the circumferential direction. In this way, the connection terminal 40, i.e., the recessed groove 41, is positioned in the gap G1 between two insulators 27 adjacent in the circumferential direction. The protrusion 54 on the inner peripheral surface of the inner busbar member 38 may engage with the through hole 70 formed in the inner peripheral portion 51 of the insulator 27. In this way, the inner busbar member 38 is easily positioned in the inner peripheral groove 33. In addition, the height of the connection terminal 40 in the axis x direction is set to be equal to or less than the depth of the first groove 53 of the insulator 27. In other words, the upper end of the connection terminal 40 does not protrude upward from the upper end of the insulator 27.

[0034] On the other hand, in the outer busbar member 42, the connection terminals 46 do not protrude upward from the outer circumferential portion 43 and the inner circumferential portion 44, but are embedded within the outer circumferential portion 43 and the inner circumferential portion 44. That is, the grooves 47 are directly formed in the outer circumferential portion 43 and the inner circumferential portion 44. In this way, the connection terminals 46 do not protrude upward from the outer circumferential portion 43 and the inner circumferential portion 44, and the outer circumferential portion 43 and the inner circumferential portion 44 are completely accommodated in the first outer circumferential groove 34 and the second outer circumferential groove 35. Furthermore, the connection portions 45 of the outer busbar member 42 are disposed in the groove portions 71 formed across the second grooves 55 and the third grooves 56 of the outer circumferential portion 52 of the insulator 27. In this way, the positions of the grooves 47 are disposed in positions in the circumferential direction different from the positions in the above-described embodiment. Specifically, all the grooves 47 are positioned within the second gap G2.

[0035] As shown in FIG. 9, a recess 72 is formed in the other outer bus bar member 42 that overlaps in the radial direction with the first outer bus bar member 42 in which the recessed groove 47 is formed, at a position corresponding to the position where the recessed groove 47 is formed. This recess 72 prevents an erroneous electrical connection with the lead wire 28a. The height of the connection terminal 46 in the direction of the axis x is set to be equal to or less than the depth of the second groove 55 and the third groove 56 of the insulator 27. The shape of the external connection terminal 48 may be different from that of the above-mentioned embodiment. According to the stator assembly 25B, it is possible to prevent the connection terminals 40 and 46 from protruding above the insulator 27, so that the height of the stator assembly 25B can be further reduced. The motor 1 can be further miniaturized.

[0036] Although the present invention has been described above through the above embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is clear to those skilled in the art that various modifications or improvements can be made to the above embodiments. It is clear from the claims that such modifications or improvements can also be included in the technical scope of the present invention.

[0037] The above-described embodiments are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. The components of the above-described embodiments, as well as their arrangements, materials, conditions, shapes, sizes, etc., are not limited to those illustrated, and can be modified as appropriate. Furthermore, components shown in different embodiments can be partially substituted or combined with each other within the scope of technical inconsistency. [Explanation of symbols]

[0038] 1 motor, 10 shaft, 12 bearing, 13 bearing, 14 housing body, 15 cover, 16 opening, 17 opening, 18 rotor core, 19 inner periphery, 20 outer periphery, 21 connection portion, 22 magnet, 23 through hole, 24 rotor, 25 stator assembly, 25A stator assembly, 25B stator assembly, 26 stator core, 27 insulator, 28 coil, 29 cylindrical portion, 30 teeth, 31 spoke, 32 magnetic pole portion, 33 groove (inner periphery groove), 34 first groove (first outer periphery groove), 35 second groove (second outer periphery groove), 36 inner bus bar (inner bus bar), 37 outer bus bar (outer bus bar), 28a lead wire, 38 inner bus bar member (conductive member, inner bus bar member), 39 body, 40 connection terminal, 41 groove, 42 outer busbar member (conductive member, outer busbar member), 43 outer periphery, 44 inner periphery, 45 connection portion, 46 connection terminal, 47 groove, 48 end portion (external connection terminal), 49 stator, 50 tubular portion, 51 inner periphery, 52 outer periphery, 53 first groove, 54 protrusion, 55 second groove, 56 third groove, 60 portion (inner piece), 61 portion (outer piece), 62 portion (connection piece), 63 groove, 64 groove, 65 portion (outer piece), 66 portion (inner piece), 67 portion (connection piece), 68 groove, 69 groove, 70 through hole, 71 groove portion, 72 recess, B boundary surface, G1 gap, G2 gap, x axis

Claims

1. Insulators and an inner bus bar disposed on an inner periphery of the insulator; and an outer bus bar disposed on an outer periphery of the insulator.

2. the inner bus bar comprises a plurality of inner conductive members; The motor according to claim 1 , wherein the plurality of inner conductive members are arranged side by side in a circumferential direction.

3. the outer bus bar comprises a plurality of outer conductive members; The motor according to claim 1 , wherein the outer conductive members are arranged side by side in a radial direction.

4. The motor of claim 3 , wherein for N grooves in the outer periphery of the insulator in a radial direction, the number of the outer conductive members is greater than N.

5. The motor of claim 4 , wherein a number of said plurality of outer conductive members is less than a number of said plurality of inner conductive members.

6. 6. The motor according to claim 1, wherein an end of the outer conductive member is a terminal that is connected to an external device directly or via another member.

Images