CN115733272A - Motor and vehicle - Google Patents

Abstract

The invention provides a motor and a vehicle. A stator of a motor has a core back, a plurality of teeth, a plurality of coil portions, and crossover lines. The core back is disposed radially inward of the magnet and surrounds the central axis. The plurality of teeth extend radially outward from the core back and are arranged in the circumferential direction. In the plurality of coil portions, a lead wire is arranged in each tooth. The crossover line is arranged radially inward of the core back, and electrically connects different coil portions. The lead has an extension portion extending radially inward from the coil portion relative to the core back portion. The extension is connected to the crossover. According to the motor and the vehicle of the present invention, an increase in the axial dimension of the motor can be suppressed.

Description

Motor and vehicle

Technical Field

The invention relates to a motor and a vehicle.

Background

In a conventional motor, a plurality of coils arranged in a circumferential direction are connected by crossovers. For example, the coils of the stator are wound around core teeth provided to protrude radially outward from an annular core yoke, and are connected in series by crossovers. The crossover of each coil reaches the next coil through the crossover accommodating portion (see japanese patent laid-open No. 2003-204645).

[ Prior art documents ]

[ patent document ]

[ patent document 1] Japanese patent laid-open No. 2003-204645

Disclosure of Invention

[ problems to be solved by the invention ]

However, in japanese patent laid-open No. 2003-204645, the crossover receiving portion is disposed axially above the core yoke portion. Therefore, the axial dimension of the stator becomes large, and it is difficult to suppress an increase in the axial dimension of the motor.

The invention aims to restrain the increase of the axial dimension of a motor.

[ means for solving problems ]

An exemplary motor of the present invention includes a rotor and a stator. The rotor is rotatable about a central axis extending in an axial direction. The stator and the rotor are radially opposed. The rotor has a magnet surrounding the central shaft. The stator includes a core back (core back), a plurality of teeth (teeth), a plurality of coil portions, and a crossover. The core back portion is disposed radially inward of the magnet and surrounds the central axis. The plurality of teeth extend radially outward from the core back and are arranged in a circumferential direction. In the plurality of coil portions, a lead wire is disposed in each of the teeth. The crossover line is disposed radially inward of the core back, and electrically connects the different coil portions. The wire has an elongated portion extending radially inward from the coil portion relative to the core back portion. The extension portion is connected with the crossover line.

An exemplary vehicle of the invention includes the motor.

[ Effect of the invention ]

According to the exemplary motor and vehicle of the invention, an increase in the axial dimension of the motor can be suppressed.

Drawings

Fig. 1 is a sectional view of a main portion of a motor in an enlarged manner.

Fig. 2 is a sectional view of the motor.

Fig. 3 is an external view of the annular member.

Fig. 4 is a conceptual diagram showing a configuration example of a motor-mounted vehicle.

[ description of symbols ]

1: motor with a stator having a stator core

2: main shaft

3: rotor

31: rotor barrel

32: wheel frame

321: trough

33: magnet

4: stator with a stator core

41: stator core

411: iron core back

412: tooth

42: insulator body

43: coil part

44: conducting wire

441: extension part

45: crossover line

5: binding part

6: stator holder

61: inner tube part

62: holder cylinder

63: connecting part

71: first cover member

711: cover

712: bearing retainer

713: bearing assembly

714: barrel part

715: end cap

72: second cover member

721: cover

722: bearing retainer

723: bearing assembly

724: end cap

8: ring-shaped member

81: annular plate part

811: wall surface

82: projection part

83: a first groove part

831: barrel part

832: floor part

8321: hole part

833: peripheral wall part

84: fixing part

841: opening part

85: the second groove part

9: substrate board

91: sensor with a sensor element

100: vehicle with a steering wheel

110: front wheel

120: rear wheel

121: tyre for vehicle wheels

130: vehicle body

140: handle bar

150：ECU

160: : battery with a battery cell

CX: center shaft

D1: one side in the axial direction

D2: axial direction another side

Di: radial inner square

And (2) Do: radially outward

Detailed Description

Hereinafter, exemplary embodiments will be described with reference to the drawings.

In the present specification, the direction parallel to the central axis CX in the motor 1 is referred to as an "axial direction". The direction perpendicular to the central axis CX is referred to as a "radial direction", and the rotational direction about the central axis CX is referred to as a "circumferential direction". In the radial direction, the direction toward the central axis CX is referred to as "radially inward Di", and the direction away from the central axis CX is referred to as "radially outward Do".

In the present specification, the term "ring-like" includes a shape in which one or more ring-like portions are continuously connected to one another without being broken in the entire circumferential direction around the central axis CX, and a shape in which one or more ring-like portions are broken in a part of the entire circumferential direction around the central axis CX. The shape may be a shape in which a closed curve is drawn on a curved surface intersecting the central axis CX with the central axis CX as the center.

In the positional relationship between one of the orientation, line and plane and the other, the term "parallel" includes not only a state in which the two do not intersect each other regardless of the extension, but also a state in which they are substantially parallel. The terms "perpendicular" and "orthogonal" include not only a state where they intersect each other at 90 degrees, but also a substantially perpendicular state and a substantially orthogonal state, respectively. That is, "parallel", "perpendicular", and "orthogonal" respectively include a state in which the positional relationship of the two has an angular offset to such an extent that the positional relationship does not deviate from the gist of the present invention.

These are merely names for explanation, and are not intended to limit actual positional relationships, directions, names, and the like.

< 1. Motor 1 >

Fig. 1 is a sectional view of a main portion of a motor 1 in an enlarged manner. Fig. 2 is a sectional view of the motor 1. Fig. 1 is an enlarged view of a portion I surrounded by a broken line in fig. 2.

The motor 1 includes a main shaft 2, a rotor 3, a stator 4, a strapping portion 5, a stator holder 6, a first cover member 71, a second cover member 72, a ring member 8, and a base plate 9.

< 1-1. Main shaft 2 >

The main shaft 2 has a cylindrical shape and extends in the axial direction along the central axis CX. In the present embodiment, the main shaft 2 is a fixed shaft, and is fixed to, for example, a vehicle body 130 of the vehicle 100 so as not to rotate (see fig. 4 described later).

< 1-2. Rotor 3 >

The rotor 3 is rotatable about a central axis CX extending in the axial direction. As described above, the motor 1 includes the rotor 3. In the present embodiment, the rotor 3 is rotatable with respect to the main shaft 2. The rotor 3 includes a rotor cylindrical portion 31 and a rim (rim) 32. The rotor cylinder 31 surrounds the center axis CX and extends in the axial direction. Preferably, the rotor tube 31 is formed using a magnetic material and functions as a yoke of the magnet 33. However, the above illustration does not exclude a structure in which the rotor cylinder 31 is formed using a non-magnetic material. Further, a magnetic body separate from the rotor tube 31 may be disposed between the rotor tube 31 and the magnet 33.

The wheel frame 32 is annular surrounding the central axis CX and is disposed radially outward Do of the rotor tube portion 31. The wheel frame 32 is integrated with the rotor tube 31 in the present embodiment, but may be a member separate from the rotor tube 31. A tire 121 (see fig. 4 described later) is attached to the wheel frame 32, for example. The rim 32 has a groove 321 recessed from the radially outer side Do toward the radially inner side Di. In the groove 321, a part of the tire 121 (for example, an air tube) is housed.

The rotor 3 further includes a magnet 33 surrounding the central axis CX. The magnet 33 is disposed on the end surface on the radially inner Di side of the rotor tube 31. In the magnet 33, magnetic poles (N-pole and S-pole) different from each other are alternately arranged in the circumferential direction. The magnet 33 may be an annular member surrounding the central axis CX, or may be configured to include a plurality of magnet pieces arranged in the circumferential direction.

< 1-3. Stator 4 >

The stator 4 is radially opposed to the rotor 3. As described above, the motor 1 includes the stator 4. The stator 4 is disposed radially inward Di of the rotor 3. The stator 4 includes a stator core 41, an insulator 42, a plurality of coil portions 43, a lead wire 44, and a crossover 45. The stator core 41 is formed using a magnetic material, and in the present embodiment, is a laminated body in which electromagnetic steel plates are laminated in the axial direction. The stator core 41 has a core back 411 and a plurality of teeth 412. Core back 411 is disposed radially inward Di of magnet 33 and surrounds central axis CX. The stator 4 has a core back 411. The motor 1 includes a stator 4. The plurality of teeth 412 extend radially outward Do from the core back 411 and are arranged in the circumferential direction. The stator 4 has a plurality of teeth 412.

The insulator 42 is made of an electrically insulating material such as resin, and is disposed at both axial end portions of the stator core 41. Each insulator 42 has an annular portion 421 and a plurality of pieces 422. The annular portion 421 is annular surrounding the central axis CX and is disposed at an axial end of the core back 411. The plurality of pieces 422 project radially outward Do from the annular portion 421 and are arranged in the circumferential direction. Each piece 422 is disposed at an axial end of the tooth 412.

The coil portion 43 is a member in which the conductive wire 44 is disposed on each tooth 412. As described above, the stator 4 has the plurality of coil portions 43. When a drive current is supplied to each coil portion 43, the stator 4 is excited to drive the rotor 3.

The conductive wire 44 is, for example, an enamel-coated copper wire, a metal wire coated with an insulating member, or the like, and is wound around the teeth 412 to form the coil portion 43. The lead 44 has an extension 441. The extension portion 441 extends radially inward Di from the coil portion 43 with respect to the core back portion 411.

The crossover 45 electrically connects the different coil portions 43. As described above, the stator 4 has the crossover 45. The crossover line 45 is disposed radially inward Di of the core back 411 and extends in the circumferential direction. The extension 441 is connected to the crossover 45. The extension portion 441 is a portion of the lead 44, and is a portion of the lead 44 extending from the coil portion 43 to the radially inner direction Di until it is connected to the crossover 45. By disposing the crossover 45 radially inward Di of the core back 411, a space for disposing the crossover 45 may not be secured axially outward of the core back 411. Therefore, an increase in the axial dimension of the motor 1 can be suppressed.

Further, the crossover 45 is arranged radially inward Di of a later-described holder cylindrical portion 62 of the stator holder 6. With this configuration, the space for disposing the crossover line 45 may not be secured on the one side D1 in the axial direction with respect to the holder cylinder portion 62. Therefore, an increase in the axial dimension of the motor 1 can be suppressed.

In the present embodiment, the crossover 45 is a part of the lead 44. That is, the conductive line 44 has a crossover line 45. However, the crossover 45 is not limited to the above example, and may be a different member from the lead 44.

< 1-4. Binding part 5 >

The bundling section 5 bundles the plurality of crossovers 45. As described above, the motor 1 has the binding portion 5. Preferably, the binding portion 5 is connected to the ring member 8. With such a setting, the plurality of crossovers 45 can be bundled and fixed to the ring member 8 by the bundling portion 5. For example, in the present embodiment, the binding portion 5 is coupled to an inner surface of a first groove portion 83, which will be described later, of the annular member 8. Specifically, the binding portion 5 is a flexible linear member (e.g., a binding tape). As shown in fig. 1, the binding portion 5 is inserted through a hole portion 8321, which will be described later, of the first groove portion 83, and is wound around a bundle including the plurality of crossover lines 45 together with a part of a bottom plate portion 832, which will be described later, of the first groove portion 83, and is connected annularly. Thereby, the bundling portion 5 can fix the bundle of crossovers 45 to the bottom plate portion 832. With this setting, the plurality of crossover lines 45 bundled by the bundling portion 5 can be held in the first groove portion 83. The movement of the crossover line 45 to the outside of the first groove portion 83 can be more reliably prevented, and thus the interference of the crossover line 45 with other members can be more reliably prevented.

< 1-5. Stator holder 6 >

The stator holder 6 holds the stator 4. The stator holder 6 has an inner cylinder portion 61, a holder cylinder portion 62, and a connecting portion 63.

The inner cylinder portion 61 is a cylindrical portion extending in the axial direction around the central axis CX and is fixed to an end surface of the main shaft 2 on the radially outer Do side.

The holder cylinder portion 62 is disposed radially outward Do of the inner cylinder portion 61. The holder cylinder portion 62 surrounds the central axis CX and extends in the axial direction, and holds the core back portion 411 at an end surface on the radially outer Do side. As described above, the stator holder 6 has the holder cylinder portion 62. Also, the motor 1 includes a stator holder 6.

The connecting portion 63 connects the inner tube portion 61 and the holder tube portion 62. The connecting portion 63 extends radially outward Do from the radially outward Do side end surface of the inner cylindrical portion 61. The radially outer Do side end of the connecting portion 63 is connected to the holder cylindrical portion 62.

< 1-6. First cover member 71 >

The first cover member 71 covers one end portion of the rotor 3 on the side of the axial direction D1. The first cover member 71 is rotatable together with the rotor 3 with respect to the main shaft 2. The first cover member 71 has a cover 711, a bearing holder 712, a bearing 713, a barrel 714, and an end cap (end cap) 715.

The cover 711 has an annular shape surrounding the main shaft 2, is disposed on one of the axial sides D1 of the stator 4, and extends in the radial direction. The radially outer Do side end of the cap 711 is connected to one of the axial D1 side ends of the rotor tube 31.

The bearing holder 712 is cylindrical surrounding the main shaft 2, and extends from an end portion of the cover 711 on the radially inner Di side toward the other axial direction D2. The bearing holder 712 holds a bearing 713, rotatably supporting the spindle 2 via the bearing 713.

The cylindrical portion 714 is cylindrical and surrounds the main shaft 2, and extends from the radially inner Di side end of the cover 711 toward one of the axial directions D1. An end cap 715 is disposed on the inner circumferential surface of the tube 714. The end cap 715 is annular to surround the spindle 2, and covers a space between the spindle 2 and the cylindrical portion 714. By disposing the end cap 715 on the outer side of the bearing 713 (i.e., on one side D1 in the axial direction), dust, liquid, and the like can be prevented from penetrating into the motor 1 through the gap between the main shaft 2 and the tube portion 714.

< 1-7. Second cover member 72 >)

The second cover member 72 covers the end portion of the rotor 3 on the other axial side D2. The second cover member 72 is rotatable together with the rotor 3 with respect to the main shaft 2. The second cover member 72 has a cover 721, a bearing retainer 722, a bearing 723, and an end cap 724.

The lid 721 is annular surrounding the main shaft 2, is arranged on the other axial side D2 than the stator 4, and extends in the radial direction. The radially outer Do side end of the cap 721 is connected to the other axial D2 side end of the rotor tube 31.

The bearing retainer 722 is cylindrical surrounding the main shaft 2, and extends from the end on the radially inner Di side of the cover 721 toward the other axial direction D2. The bearing holder 712 holds a bearing 723, rotatably supporting the main shaft 2 via the bearing 723.

Further, an end cap 724 is disposed on the inner peripheral surface of the bearing holder 722 in the other axial direction D2 than the bearing 723. The end cap 724 is annular and surrounds the main shaft 2, and covers the space between the main shaft 2 and the bearing holder 722. By disposing the end cap 724 on the outer side of the bearing 723 (i.e., on the other axial side D2), dust, liquid, and the like can be prevented from penetrating into the motor 1 through between the main shaft 2 and the bearing holder 722.

< 1-8. Ring Member 8 >

The annular member 8 is disposed at one end of the retainer cylinder portion 62 on the axial direction D1 side, and surrounds the central axis CX. As described above, the motor 1 includes the annular member 8. In the present embodiment, the ring member 8 is made of an electrically insulating material such as resin, and has a ring shape surrounding the central axis CX. In the present embodiment, the ring member 8 is a member separate from the insulator 42. This facilitates the work of attaching the insulator 42 and the ring member 8. However, the present invention is not limited to the above example, and the ring member 8 may be integrated with the insulator 42.

The ring member 8 has an annular plate portion 81, a protruding portion 82, a first groove portion 83, a fixing portion 84, and a second groove portion 85.

< 1-8-1. Ring plate part 81 >

The annular plate portion 81 is annular surrounding the central axis CX and extends in the radial direction. The annular plate portion 81 may be continuously connected to one another without being broken in the entire circumferential direction around the central axis CX, or may have one or more broken portions in a part of the entire circumferential direction around the central axis CX. As described above, the annular member 8 has the annular plate portion 81. The annular plate portion 81 is disposed at one end portion of the holder cylindrical portion 62 on the D1 side in the axial direction.

The annular plate portion 81 has a pair of wall surfaces 811 facing each other at least in the circumferential direction. Of the pair of wall surfaces 811, the wall surface on one side in the circumferential direction faces the other side in the circumferential direction, and the wall surface on the other side in the circumferential direction faces one side in the circumferential direction. The pair of wall surfaces 811 extend from the end of the annular plate 81 on the radially outer Do side to the end on the radially inner Di side. The extension 441 of the lead 44 is disposed between the pair of wall surfaces 811. With this configuration, the extension portion 441 of the lead wire 44 extending from the coil portion 43 toward the radially inner side Di with respect to the holder cylinder portion 62 is guided in the radial direction by the pair of wall surfaces 811. Therefore, the extension 441 can be smoothly and compactly drawn radially inward Di with respect to the core back 411.

Preferably, the extension 441 is retained by at least a portion of a pair of wall surfaces 811. For example, the extension 441 is in contact with at least a portion of one of the pair of wall surfaces 811 and with at least a portion of the other of the pair of wall surfaces 811. With this configuration, the extension 441 extracted radially inward Di from the coil portion 43 can be held by the pair of wall surfaces 811. Therefore, the extension 441 can be easily further withdrawn.

< 1-8-2. Protrusion 82 >)

The projecting portion 82 projects radially outward Do at the radially outward Do side end portion of the ring member 8. As described above, the annular member 8 has the projection 82. More specifically, the protruding portion 82 is provided in plurality. The respective protrusions 82 are disposed at the end portion of the annular plate portion 81 on the radially outer Do side and arranged in the circumferential direction.

Each projection 82 is disposed axially between the lead 44 and the tooth 412. Specifically, the insulator 42 is disposed at one end portion of the teeth 412 on the side of the axis D1. The protrusion 82 is disposed at one end portion of the insulator 42 on the side of the axis D1. One end portion of the projection 82 on the side of the axis D1 is in contact with the lead 44. In the teeth 412 where the protruding portion 82 is arranged, the lead wire 44 of the coil portion 43 is wound around the protruding portion 82 and the teeth 412. This allows the protrusion 82 to be fixed to the tooth 412, and thus improves the fixing strength of the ring member 8.

Preferably, as shown in fig. 1, the radially outer Do side end of the protruding portion 82 is located radially inward Di of the radially outer Do side end of the coil portion 43. With this configuration, the number of turns of the conductive wire 44 in the portion located radially outward Do from the protruding portion 82 of the tooth 412 and radially inward Di from the end portion located radially outward Do of the coil portion 43 can be increased more than the portion located radially inward Di from the end portion located radially outward Do of the protruding portion 82 of the tooth 412, without changing the axial position of the end portion located on one D1 side in the axial direction of the coil portion 43. Therefore, the number of turns of the coil portion 43 can be suppressed from decreasing due to the arrangement of the protruding portion 82. However, the above example does not exclude a configuration in which the end portion on the radially outer Do side of the protruding portion 82 is not located radially inward Di of the end portion on the radially outer Do side of the coil portion 43.

As shown in fig. 3, at least a part of the projections 82 is preferably arranged rotationally symmetrically with respect to the central axis CX. That is, at least a part of the projections 82 have n-fold symmetry (n is an integer of 2 or more), and are arranged so as to overlap when rotated (360/n) ° around the central axis CX. With such a configuration, the annular member 8 can be fixed more stably because the protrusion 82 is fixed to the tooth 412 at least partially with rotational symmetry in the circumferential direction. However, the above illustration does not exclude a configuration in which all the projections 82 are not arranged rotationally symmetrically with respect to the central axis CX.

< 1-8-3. First groove portion 83 >

The crossover line 45 is disposed in the first groove portion 83. As described above, the ring member 8 has the first groove portion 83. The first groove 83 is disposed radially inward Di of the core back 411 and extends in the circumferential direction. In the present embodiment, the first groove 83 is annular surrounding the central axis CX. The first groove 83 is recessed toward the other axial direction D2. The first groove 83 accommodates the crossover 45 and the tying portion 5, and preferably accommodates the entire crossover 45 and the tying portion 5.

The first groove 83 includes a cylindrical portion 831, a bottom plate 832, and a peripheral wall 833. The tube 831 extends from the end on the radially inner Di side of the annular plate 81 to the other axial direction D2. The bottom plate 832 is annular surrounding the center axis CX and extends radially inward Di from the end portion of the tube portion 831 on the other axial side D2. The peripheral wall portion 833 is disposed radially inward Di from the holder cylinder portion 62 and the crossover line 45. The annular member 8 has a peripheral wall portion 833. The circumferential wall 833 projects in one of the axial directions D1 at the end portion on the radially inner side Di side of the annular member 8 and extends in the circumferential direction. For example, in the present embodiment, the peripheral wall 833 extends from the radially inner Di side end of the bottom plate 832 toward one of the axial directions D1. The peripheral wall 833 also extends in the circumferential direction, and is cylindrical surrounding the central axis CX in the present embodiment. By the annular member 8 having the peripheral wall portion 833, the movement of the crossover line 45 to the radially inner direction Di can be prevented by the peripheral wall portion 833.

As described above, the peripheral wall 833 is a part of the first groove portion 83. With this configuration, the crossover 45 can be accommodated in the first groove 83, and thus the crossover 45 can be more reliably prevented from moving radially inward Di and interference with other members due to the crossover 45 can be prevented.

However, the example of the present embodiment does not exclude a structure in which the peripheral wall portion 833 is not a part of the first groove portion 83. For example, when the end portion on the radially inner Di side of the annular plate portion 81 is arranged further on the radially inner Di side than the holder cylindrical portion 62, the peripheral wall portion 833 may extend in the axial direction from the end portion on the radially inner Di side of the annular plate portion 81.

< 1-8-4 > fixing part 84 >

The fixing portion 84 fixes the substrate 9. As described above, the ring member 8 has the fixing portion 84. The fixing portion 84 protrudes from the annular plate portion 81 in one of the axial directions D1. The substrate 9 is connected to one end portion of the fixing portion 84 on the D1 side in the axial direction. The fixing portion 84 is disposed radially between the crossover 45 and the coil portion 43 and extends in the circumferential direction.

The fixing portion 84 has an opening 841. The opening 841 penetrates the fixing portion 84 from the end portion on the radially outer Do side to the end portion on the radially inner Di side of the fixing portion 84. The ring member 8 has an opening 841. At least a part of the extension 441 extends radially inward Di of the core back 411 from the coil portion 43 through the opening 841. With this configuration, even if the fixing portion 84 of the fixing substrate 9 is disposed between the crossover 45 and the coil portion 43 in the radial direction, the fixing portion 84 does not detour when the extension portion 441 of the lead wire 44 is drawn out radially inward Di from the fixing portion 84. Therefore, the extension portion 441 can be easily extracted radially inward Di from the coil portion 43 disposed radially outward Do with respect to the fixing portion 84.

In the present embodiment, the opening 841 is a recess that is recessed from one end portion of the fixing portion 84 on the side of the axis D1 toward the other end portion in the axis D2. However, the opening 841 is not limited to the above example, and may be a hole extending in the radial direction, that is, may not be open at one end portion of the fixing portion 84 on the side of the D1 in the axial direction.

< 1-8-5 > second groove portion 85 >

In the second groove 85, an extension 441 of the lead 44 is disposed. As described above, the ring member 8 has the second groove portion 85. The second groove portion 85 is disposed on one end surface of the annular plate portion 81 on the side of the axial direction D1, and is recessed toward the other axial direction D2. The second groove portion 85 includes a pair of wall surfaces 851 and a bottom surface (not shown) connecting end portions of the pair of wall surfaces 851 on the other axial direction D2 side to each other. That is, the pair of wall surfaces 851 are inner surfaces of the second groove portion 85 at least facing in the circumferential direction. With this configuration, a space for drawing out the extension portion 441 to the one D1 side in the axial direction with respect to the annular plate portion 81 is not required. Therefore, an increase in the axial dimension of the motor 1 can be suppressed. The above illustration does not exclude a configuration in which the pair of wall surfaces 811 are not the inner surfaces of the second groove portion 85. For example, the pair of wall surfaces 851 may be peripheral side surfaces of a pair of ribs adjacent in the circumferential direction. The rib may be arranged on the end surface of the annular plate portion 81 on one side D1 in the axial direction instead of at least a part of the second groove portion 85, and may protrude toward one side D1 in the axial direction and extend in the radial direction.

< 1-9. Substrate 9 >

The substrate 9 is disposed at one end portion of the annular member 8 on the side of the axial direction D1, and extends in a direction intersecting the axial direction. As described above, the motor 1 includes the base plate 9. By disposing the substrate 9 at one end portion of the annular member 8 on the side of the axis D1, the substrate 9 can be compactly disposed with good workability.

At least a part of the substrate 9 is disposed radially outward Do of the core back 411. With such a configuration, the area of the substrate 9 as viewed from the axial direction can be made wider than in a configuration in which the entire substrate 9 is disposed radially inward Di of the core back 411.

For example, a sensor 91 is mounted on the end surface of the substrate 9 on the other axial direction D2 side. The sensor 91 is a hall sensor for detecting the rotation speed of the rotor 3. The sensor 91 is disposed between circumferentially adjacent teeth 412 and radially faces the magnet 33.

< 2. Vehicle 100 >

In the present embodiment, the motor 1 is a so-called in-wheel motor (in-wheel motor) and is mounted on the vehicle 100. Fig. 4 is a conceptual diagram illustrating a configuration example of vehicle 100. The vehicle 100 of fig. 4 is an electric motorcycle. The vehicle 100 includes a motor 1. In vehicle 100, crossover 45 electrically connecting coil portions 43 is disposed radially inward Di of core back portion 411, whereby an increase in the axial dimension of motor 1 mounted on vehicle 100 can be suppressed. However, the illustration of the present embodiment does not exclude a configuration in which the motor 1 is mounted on a vehicle 100 other than an electric motorcycle.

The vehicle 100 further includes front wheels 110, rear wheels 120, a vehicle body 130, a handle 140, an Electronic Control Unit (ECU) 150, and a battery 160. The front wheel 110 and the rear wheel 120 are rotatably mounted to the vehicle body 130. The motor 1 is disposed on the rear wheel 120. The rear wheel 120 includes a motor 1 and a tire 121 attached to a wheel frame 32 of the motor 1. At the front of the vehicle body 130, a handle 140 is mounted. ECU150 is disposed inside vehicle body 130. ECU150 is a control device that controls each configuration of vehicle 100, and controls motor 1 and battery 160, for example. Battery 160 is disposed inside vehicle body 130. Battery 160 is a rechargeable secondary battery, and supplies electric power to motor 1 and ECU150, for example. In the present embodiment, a lithium ion battery is used as the battery 160.

< 3. Other >)

The embodiments of the present invention have been described above. The scope of the present invention is not limited to the embodiments. The present invention can be implemented by variously changing the above-described embodiments without departing from the scope of the invention. The matters described in the above embodiments may be combined as appropriate within a range not inconsistent with each other.

[ Industrial Applicability ]

The present invention is useful for a motor device in which coil portions arranged in the circumferential direction are connected by crossovers, for example.

Claims (13)

1. A motor, comprising:

a rotor rotatable about a central axis extending in an axial direction; and

a stator facing the rotor in a radial direction,

the rotor has a magnet surrounding the central shaft,

the stator has:

a core back portion disposed radially inward of the magnet and surrounding the central axis;

a plurality of teeth extending radially outward from the core back and arranged in a circumferential direction;

a plurality of coil portions in which a conductive wire is disposed in each of the teeth; and

a crossover line disposed radially inward of the core back portion and electrically connecting different coil portions,

the lead has an extension portion extending radially inward from the coil portion relative to the core back portion,

the extension is connected to the crossover.

2. The motor of claim 1, further comprising:

a stator holder having a holder cylindrical portion that surrounds the central shaft, extends in an axial direction, and holds the core back portion at an end surface on an outer side in a radial direction,

the crossover line is arranged more radially inward than the holder cylinder portion.

3. The motor of claim 2, further comprising:

an annular member disposed at one axial end of the holder cylinder and surrounding the central shaft,

the annular member has a peripheral wall portion arranged radially inward of the holder cylinder portion and the crossover line,

the circumferential wall portion protrudes in one of the axial directions at an end portion on a radially inner side of the annular member, and extends in the circumferential direction.

4. The motor of claim 3,

the annular member has a first groove portion provided with the crossover,

the first groove portion is disposed radially inward of the core back portion and extends in a circumferential direction,

the peripheral wall portion is a part of the first groove portion.

5. The motor according to claim 3 or 4, further comprising:

a binding part binding the plurality of crossover lines,

the binding portion is coupled to the annular member.

6. The motor of claim 4, further comprising:

a binding part binding the plurality of crossover lines,

the binding portion is coupled to an inner surface of the first groove portion.

7. The motor according to any one of claims 3 to 6,

the annular member has: an annular plate portion disposed at one axial end of the holder cylinder portion,

the annular plate portion has a pair of wall surfaces facing each other at least in the circumferential direction,

the pair of wall surfaces extend from an end portion on a radially outer side of the annular plate portion to an end portion on a radially inner side,

the extension portion is disposed between the pair of wall surfaces.

8. The motor of claim 7,

the extension portion is contiguous with at least a portion of one of the pair of wall surfaces and contiguous with at least a portion of the other of the pair of wall surfaces.

9. The motor according to claim 7 or 8,

the annular member further has: a second groove portion in which the extension portion is disposed,

the second groove portion is disposed on an end surface of one side in the axial direction of the annular plate portion and is recessed toward the other side in the axial direction,

the pair of wall surfaces are inner surfaces of the second groove portion that face at least in the circumferential direction.

10. The motor according to any one of claims 3 to 9, further comprising:

a base plate disposed at one end portion of the annular member in the axial direction and extending in a direction intersecting the axial direction,

the annular member further has:

a fixing portion for fixing the substrate; and

an opening portion that penetrates the fixing portion from an end portion on a radially outer side to an end portion on a radially inner side of the fixing portion,

the fixing portion is disposed between the crossover and the coil portion in a radial direction, extends in a circumferential direction,

at least a part of the elongated portion extends radially inward from the coil portion through the opening portion.

11. The motor of claim 10,

at least a part of the substrate is disposed radially outward of the core back.

12. The motor according to any one of claims 3 to 11,

the annular member has: a protruding portion that protrudes radially outward at an end portion on a radially outward side of the annular member,

the protruding portion is disposed between the lead and the tooth in the axial direction.

13. A vehicle comprising a motor as claimed in any one of claims 1 to 12.

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