Motors and vehicles

Abstract

To arrange a substrate of a motor compactly with good workability.SOLUTION: A stator 4 of a motor has a core back 411. The core back is disposed at the radial inner side relative to the magnet and encloses a center axis. A holder cylinder part 62 of a stator holder 6 encloses the center axis, extends in an axial direction, and holds the core back on a radial outer surface. A ring member 8 is disposed at one axial end of the holder cylinder part and encloses the center axis. The substrate 9 is disposed at one axial end of the ring member and spreads in a direction intersecting the axial direction. At least a part of the substrate spreads to the radial outer side relative to the core back.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In conventional motors, multiple coils arranged in the circumferential direction are connected by crossover wires. For example, each coil of the stator is wound around a core tooth portion that protrudes radially outward from a circular core yoke portion and is connected in series by crossover wires. The crossover wire of each coil passes through a crossover wire storage portion and connects to the next coil (see Japanese Patent Application Laid-Open No. 2003-204645). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-204645 Summary of the Invention [Problem to be solved by the invention]

[0004] In JP 2003-204645 A, the crossover wire storage section is located above the core yoke in the axial direction. Therefore, if the circuit board is located at the axial end of the stator, the motor tends to become larger. Furthermore, if the circuit board is located radially inward from the stator, it tends to be difficult to position and install the circuit board.

[0005] An object of the present invention is to arrange the circuit board of a motor in a compact manner with good workability. [Means for solving the problem]

[0006] An exemplary motor of the present invention includes a rotor, a stator, a stator holder, a ring member, and a substrate. The rotor has a magnet. The magnet surrounds a central axis extending in the axial direction. The rotor is rotatable around the central axis. The stator has a core back. The core back is disposed radially inward from the magnet and surrounds the central axis. The stator holder has a holder tube portion. The holder tube portion extends axially around the central axis and holds the core back on its radially outer surface. The ring member is disposed at one axial end of the holder tube portion and surrounds the central axis. The substrate is disposed at one axial end of the ring member and extends in a direction intersecting the axial direction. At least a portion of the substrate extends radially outward beyond the core back.

[0007] An exemplary vehicle of the present invention includes the motor described above. [Effects of the Invention]

[0008] According to the exemplary motor and vehicle of the present invention, the motor circuit board can be arranged compactly with good workability. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an enlarged cross-sectional view of a main part of the motor. [Figure 2] FIG. 2 is a cross-sectional view of the motor. [Figure 3] FIG. 3 is an external view of the ring member. [Figure 4] FIG. 4 is a conceptual diagram showing an example of the configuration of a vehicle equipped with a motor. DETAILED DESCRIPTION OF THE INVENTION

[0010] Exemplary embodiments will now be described with reference to the drawings.

[0011] In this specification, in the motor 1, the direction parallel to the central axis CX is referred to as the "axial direction." The direction perpendicular to the central axis CX is referred to as the "radial direction," and the direction of rotation around the central axis CX is referred to as the "circumferential direction." Within the radial direction, the direction approaching the central axis CX is referred to as the "radially inward direction Di," and the direction away from the central axis CX is referred to as the "radially outward direction Do."

[0012] In this specification, the term "annular" includes not only a shape that is continuous and uninterrupted throughout the entire circumferential area centered on the central axis CX, but also a shape that has one or more interruptions in a portion of the entire area centered on the central axis CX. It also includes a shape that describes a closed curve on a curved surface that intersects with the central axis CX, centered on the central axis CX.

[0013] Furthermore, in the positional relationship between one of a direction, a line, and a plane and another, "parallel" includes not only a state in which they do not intersect at all no matter how far they are extended, but also a state in which they are substantially parallel. Furthermore, "perpendicular" and "orthogonal" each include not only a state in which they intersect at 90 degrees, but also a state in which they are substantially perpendicular and a state in which they are substantially orthogonal. In other words, "parallel," "perpendicular," and "orthogonal" each include a state in which there is an angular deviation in the positional relationship between the two to an extent that does not deviate from the spirit of the present invention.

[0014] It should be noted that these are names used merely for the purpose of explanation and are not intended to limit the actual positional relationships, directions, names, etc.

[0015] <1. Motor 1> Fig. 1 is an enlarged cross-sectional view of a main part of the motor 1. Fig. 2 is a cross-sectional view of the motor 1. Fig. 1 is an enlarged view of a portion I surrounded by a dashed line in Fig. 2.

[0016] The motor 1 includes a shaft 2, a rotor 3, a stator 4, a binding portion 5, a stator holder 6, a first cover member 71, a second cover member 72, a ring member 8, and a substrate 9.

[0017] <1-1. Shaft 2> The shaft 2 has a cylindrical shape and extends axially along a central axis CX. In this embodiment, the shaft 2 is a fixed shaft and is fixed non-rotatably to, for example, a body 130 of the vehicle 100 (see FIG. 4 described later).

[0018] <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 this embodiment, the rotor 3 is rotatable relative to the shaft 2. The rotor 3 includes a rotor cylindrical portion 31 and a rim 32. The rotor cylindrical portion 31 extends in the axial direction, surrounding the central axis CX. Preferably, the rotor cylindrical portion 31 is formed using a magnetic material and functions as a yoke for the magnet 33. However, this example does not exclude a configuration in which the rotor cylindrical portion 31 is formed using a non-magnetic material. Furthermore, a magnetic material other than the rotor cylindrical portion 31 may be disposed between the rotor cylindrical portion 31 and the magnet 33.

[0019] The rim 32 is annular and surrounds the central axis CX, and is disposed radially outward Do of the rotor cylindrical portion 31. In this embodiment, the rim 32 is integral with the rotor cylindrical portion 31, but may be a separate member from the rotor cylindrical portion 31. A tire 121 (see FIG. 4, described later) is mounted on the rim 32, for example. The rim 32 has a groove 321 recessed from the radially outward Do to the radially inward Di. A part of the tire 121 (for example, an air tube) is housed in the groove 321.

[0020] The rotor 3 further includes a magnet 33 surrounding the central axis CX. The magnet 33 is disposed on the end face of the rotor cylindrical portion 31 on the radially inward Di side. In the magnet 33, different magnetic poles (north and south poles) are arranged alternately in the circumferential direction. The magnet 33 may be an annular member surrounding the central axis CX, or may include a plurality of magnetic pieces arranged in the circumferential direction.

[0021] <1-3. Stator 4> The stator 4 faces the rotor 3 in the radial direction. As described above, the motor 1 includes the stator 4. The stator 4 is disposed radially inward Di from the rotor 3. The stator 4 includes a stator core 41, an insulator 42, multiple coil portions 43, conductive wires 44, and crossover wires 45. The stator core 41 is formed using a magnetic material and, in this embodiment, is a laminate in which electromagnetic steel sheets are stacked in the axial direction. The stator core 41 includes a core back 411 and multiple teeth 412. The core back 411 is disposed radially inward Di from the magnet 33 and surrounds the central axis CX. The stator 4 includes the core back 411. The motor 1 includes the stator 4. The multiple teeth 412 extend radially outward Do from the core back 431 and are aligned in the circumferential direction. The stator 4 includes multiple teeth 412.

[0022] The insulators 42 are formed of an electrically insulating material such as resin, and are arranged 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 and surrounds the central axis CX, and is arranged at the axial end portion of the core back 411. The plurality of pieces 422 protrude radially outward Do from the annular portion 421 and are arranged in the circumferential direction. Each piece 422 is arranged at the axial end portion of the tooth 412.

[0023] The coil portion 43 is a component in which a conducting wire 44 is disposed on each of the teeth 412. As described above, the stator 4 has a plurality of coil portions 43. When a driving current is supplied to each coil portion 43, the stator 4 is excited and drives the rotor 3.

[0024] Conductive wire 44 is, for example, an enamel-coated copper wire or a metal wire coated with an insulating material, and is wound around tooth 412 to form coil portion 43. Conductive wire 44 has extension portion 441. Extension portion 441 extends from coil portion 43 radially inward Di beyond core back 411.

[0025] The crossover wires 45 electrically connect the different coil portions 43. As described above, the stator 4 has the crossover wires 45. The crossover wires 45 are arranged radially inward Di from the core back 411 and extend circumferentially. The extension portions 441 are connected to the crossover wires 45. The extension portions 441 are part of the conductor 44, and are the portions of the conductor 44 that extend from the coil portion 43 radially inward Di to connect to the crossover wires 45. By arranging the crossover wires 45 radially inward Di from the core back 411, it is not necessary to secure space for arranging the crossover wires 45 outside the core back 411 in the axial direction. This prevents the axial size of the motor 1 from increasing.

[0026] Furthermore, the crossover wire 45 is disposed radially inward Di from a holder cylindrical portion 62 (described later) of the stator holder 6. This eliminates the need to secure space for disposing the crossover wire 45 on one axial direction D1 side from the holder cylindrical portion 62. This prevents the axial size of the motor 1 from increasing.

[0027] In this embodiment, the crossover wire 45 is a part of the conductor wire 44. That is, the conductor wire 44 has the crossover wire 45. However, without being limited to this example, the crossover wire 45 may be a separate member from the conductor wire 44.

[0028] <1-4. Binding part 5> The bundling part 5 bundles the multiple crossover wires 45. As described above, the motor 1 includes the bundling part 5. Preferably, the bundling part 5 is connected to the ring member 8. In this manner, the multiple crossover wires 45 can be bundled and fixed to the ring member 8 by the bundling part 5. For example, in this embodiment, the bundling part 5 is connected to the inner surface of a first groove portion 83 (described later) of the ring member 8. More specifically, the bundling part 5 is a flexible linear member (e.g., a cable tie). As shown in FIG. 1 , the bundling part 5 is passed through a hole portion 8321 (described later) of the first groove portion 83 and, together with a portion of a bottom plate portion 832 (described later) of the first groove portion 83, is wrapped around the bundle of multiple crossover wires 45 and connected in a ring shape. In this way, the bundling part 5 can fix the bundle of crossover wires 45 to the bottom plate portion 832. In this manner, the multiple crossover wires 45 bundled by the bundling part 5 can be held within the first groove portion 83. Since the movement of the crossover wire 45 to the outside of the first groove portion 83 can be more reliably prevented, the interference of the crossover wire 45 with other members can be more reliably prevented.

[0029] <1-5. Stator holder 6> The stator holder 6 holds the stator 4. The stator holder 6 has an inner cylindrical portion 61, a holder cylindrical portion 62, and a connecting portion 63.

[0030] The inner cylindrical portion 61 has a cylindrical shape that extends in the axial direction and surrounds the central axis CX, and is fixed to the end face of the shaft 2 on the radially outer side Do.

[0031] The holder cylindrical portion 62 is disposed radially outward Do from the inner cylindrical portion 61. The holder cylindrical portion 62 extends in the axial direction around the central axis CX and holds the core back 411 on its end face on the radially outward Do side. As described above, the stator holder 6 has the holder cylindrical portion 62. The motor 1 also includes the stator holder 6.

[0032] The connecting portion 63 connects the inner cylindrical portion 61 and the holder cylindrical portion 62. The connecting portion 63 extends radially outward Do from the end face on the radially outer Do side of the inner cylindrical portion 61. The end of the connecting portion 63 on the radially outer Do side is connected to the holder cylindrical portion 62.

[0033] <1-6. First cover member 71> The first cover member 71 covers the end portion of the rotor 3 on one axial direction D1 side. The first cover member 71 is rotatable together with the rotor 3 relative to the shaft 2. The first cover member 71 has a cover 711, a bearing holder 712, a bearing 713, a cylindrical portion 714, and an end cap 715.

[0034] The cover 711 has an annular shape surrounding the shaft 2, is positioned on one axial direction D1 from the stator 4, and extends radially. An end portion of the cover 711 on the radially outer side Do is connected to an end portion of the rotor cylindrical portion 31 on one axial direction D1 side.

[0035] The bearing holder 712 is cylindrical and surrounds the shaft 2, and extends in the other axial direction D2 from the end of the cover 711 on the radially inner side Di. The bearing holder 712 holds a bearing 713 and rotatably supports the shaft 2 via the bearing 713.

[0036] The cylindrical portion 714 is cylindrical and surrounds the shaft 2, and extends in one axial direction D1 from the end of the cover 711 on the radially inner side Di. An end cap 715 is disposed on the inner circumferential surface of the cylindrical portion 714. The end cap 715 is annular and surrounds the shaft 2, covering the space between the shaft 2 and the cylindrical portion 714. By disposing the end cap 715 outside the bearing 713 (i.e., on one axial direction D1), it is possible to prevent dust, liquid, and the like from entering the interior of the motor 1 through the space between the shaft 2 and the cylindrical portion 714.

[0037] <1-7. Second cover member 72> The second cover member 72 covers the end portion of the rotor 3 on the other axial direction D2 side. The second cover member 72 is rotatable together with the rotor 3 relative to the shaft 2. The second cover member 72 has a cover 721, a bearing holder 722, a bearing 723, and an end cap 724.

[0038] The cover 721 has an annular shape surrounding the shaft 2, is disposed on the other axial side D2 of the stator 4, and extends radially. An end portion of the cover 721 on the radially outer side Do is connected to an end portion of the rotor cylindrical portion 31 on the other axial side D2.

[0039] The bearing holder 722 is cylindrical and surrounds the shaft 2, and extends in the other axial direction D2 from the end of the cover 721 on the radially inner side Di. The bearing holder 722 holds a bearing 723 and rotatably supports the shaft 2 via the bearing 723.

[0040] Furthermore, on the inner peripheral surface of the bearing holder 722, an end cap 724 is disposed on the other axial direction D2 than the bearing 723. The end cap 724 is annular and surrounds the shaft 2, covering the space between the shaft 2 and the bearing holder 722. By disposing the end cap 724 on the outside of the bearing 723 (that is, on the other axial direction D2), it is possible to prevent dust, liquid, and the like from entering the interior of the motor 1 through the space between the shaft 2 and the bearing holder 722.

[0041] <1-8. Ring component 8> The ring member 8 is disposed at the end of the holder cylindrical portion 62 on one axial direction D1 side, and surrounds the central axis CX. As described above, the motor 1 includes the ring member 8. In this embodiment, the ring member 8 is formed of an electrically insulating material such as resin, and has an annular shape that surrounds the central axis CX. Note that in this embodiment, the ring member 8 is a separate member from the insulator 42. This facilitates the installation of the insulator 42 and the ring member 8. However, without being limited to this example, the ring member 8 may be integral with the insulator 42.

[0042] 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.

[0043] <1-8-1. Annular plate portion 81> The annular plate portion 81 is annular and surrounds the central axis CX, and extends radially. The annular plate portion 81 may be formed in a continuous, seamless shape over the entire circumferential area centered on the central axis CX, or may have one or more slits in a portion of the entire area centered on the central axis CX. As described above, the ring member 8 has the annular plate portion 81. The annular plate portion 81 is disposed at the end of the holder cylindrical portion 62 on one axial direction D1 side.

[0044] The annular plate portion 81 has at least a pair of wall surfaces 811 that face each other in the circumferential direction. Of the pair of wall surfaces 811, the wall surface on one circumferential side faces the other circumferential side, and the wall surface on the other circumferential side faces one circumferential direction. The pair of wall surfaces 811 extend from an end of the annular plate portion 81 on the radially outer Do side toward an end on the radially inner Di side. The extension portion 441 of the conductor 44 is disposed between the pair of wall surfaces 811. In this manner, the pair of wall surfaces 811 can radially guide the extension portion 441 of the conductor 44 that extends from the coil portion 43 toward the radially inner Di side beyond the holder tube portion 62. Therefore, the extension portion 441 can be drawn out smoothly and compactly toward the radially inner Di side beyond the core back 411.

[0045] Preferably, the extension portion 441 is held by at least a portion of the pair of wall surfaces 811. For example, the extension portion 441 contacts at least a portion of one of the pair of wall surfaces 811 and contacts at least a portion of the other of the pair of wall surfaces 851. In this way, the extension portion 441 pulled out radially inward Di from the coil portion 43 can be held by the pair of wall surfaces 811. This makes it even easier to pull out the extension portion 441.

[0046] <1-8-2.Protrusion 82> The protrusions 82 protrude radially outward Do from the end of the ring member 8 on the radially outer Do side. As described above, the ring member 8 has the protrusions 82. More specifically, there are a plurality of protrusions 82. Each of the protrusions 82 is disposed at the end of the annular plate portion 81 on the radially outer Do side, and is aligned in the circumferential direction.

[0047] Each protrusion 82 is disposed between the conductor 44 and the tooth 412 in the axial direction. More specifically, an insulator 42 is disposed at the end of the tooth 412 on one axial direction D1 side. The protrusion 82 is disposed at the end of the insulator 42 on one axial direction D1 side. The end of the protrusion 82 on one axial direction D1 side contacts the conductor 44. In the tooth 412 on which the protrusion 82 is disposed, the conductor 44 of the coil portion 43 is wound around the protrusion 82 and the tooth 412. This allows the protrusion 82 to be fixed to the tooth 412, thereby improving the fixing strength of the ring member 8.

[0048] 1, the end of the protrusion 82 on the radially outer side Do is preferably positioned radially inward Di of the end of the coil portion 43 on the radially outer side Do. In this way, the number of turns of the wire 44 in the portion of the tooth 412 on the radially outer side Do of the protrusion 82 and radially inward Di of the end of the coil portion 43 on the radially outer side Do can be made greater than the portion of the tooth 412 on the radially inner side Di of the end of the protrusion 82 on the radially outer side Do of the protrusion 82, without changing the axial position of the end of the coil portion 43 on one axial side D1. Therefore, it is possible to prevent a reduction in the number of turns of the coil portion 43 due to the arrangement of the protrusion 82. However, this example does not exclude a configuration in which the end of the protrusion 82 on the radially outer side Do is not positioned radially inward Di of the end of the coil portion 43 on the radially outer side Do.

[0049] 3, at least some of the protrusions 82 are preferably arranged rotationally symmetrically with respect to the central axis CX. That is, at least some of the protrusions 82 have n-fold symmetry (n is an integer greater than or equal to 2) and are arranged so as to overlap when rotated (360 / n) degrees around the central axis CX. In this way, at least some of the protrusions 82 are fixed to the teeth 412 with rotational symmetry in the circumferential direction, thereby enabling the ring member 8 to be fixed more stably. However, this example does not exclude a configuration in which all of the protrusions 82 are not arranged rotationally symmetrically with respect to the central axis CX.

[0050] <1-8-3. First groove portion 83> The crossover wire 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 portion 83 is disposed radially inward Di from the core back 411 and extends in the circumferential direction. In the present embodiment, the first groove portion 83 is annular and surrounds the central axis CX. The first groove portion 83 is recessed in the other axial direction D2. The first groove portion 83 accommodates the crossover wire 45 and the bundling portion 5, and preferably accommodates the entire crossover wire 45 and the bundling portion 5.

[0051] The first groove portion 83 has a tubular portion 831, a bottom plate portion 832, and a peripheral wall portion 833. The tubular portion 831 extends from an end portion of the annular plate portion 81 on the radially inner side Di in the other axial direction D2. The bottom plate portion 832 is annular and surrounds the central axis CX, and extends from an end portion of the tubular portion 831 on the other axial direction D2 in the radially inner direction Di in the radially inner direction Di. The peripheral wall portion 833 is disposed radially inward Di from the holder tubular portion 62 and the crossover wire 45. The ring member 8 has the circumferential wall portion 833. The circumferential wall portion 833 protrudes in one axial direction D1 from an end portion of the ring member 8 on the radially inner side Di and extends in the circumferential direction. For example, in the present embodiment, the circumferential wall portion 833 extends in one axial direction D1 from an end portion of the bottom plate portion 832 on the radially inner side Di in the radially inner direction Di. Moreover, the circumferential wall portion 833 also extends in the circumferential direction and is cylindrical and surrounds the central axis CX in the present embodiment. The ring member 8 has the peripheral wall portion 833, which can prevent the crossover wire 45 from moving inward in the radial direction Di.

[0052] As described above, the peripheral wall portion 833 is a part of the first groove portion 83. In this way, the crossover wire 45 can be accommodated in the first groove portion 83, which makes it possible to more reliably prevent the crossover wire 45 from moving radially inward Di and to prevent the crossover wire 45 from interfering with other components.

[0053] However, the example of this embodiment does not exclude a configuration in which the peripheral wall portion 833 is not part of the first groove portion 83. For example, when the end portion of the annular plate portion 81 on the radially inner side Di is positioned radially inward Di from the holder cylindrical portion 62, the peripheral wall portion 833 may extend in the axial direction from the end portion of the annular plate portion 81 on the radially inner side Di.

[0054] <1-8-4. Fixed 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 in one axial direction D1 from the annular plate portion 81. The substrate 9 is connected to the end of the fixing portion 84 on the one axial direction D1 side. The fixing portion 84 is disposed between the connecting wire 45 and the coil portion 43 in the radial direction and extends in the circumferential direction.

[0055] The fixed portion 84 has an opening 841. The opening 841 penetrates the fixed portion 84 from the end of the fixed portion 84 on the radially outer side Do to the end of the fixed portion 84 on the radially inner side Di. The ring member 8 has the opening 841. At least a portion of the extension portion 441 extends from the coil portion 43 through the opening 841 toward the radially inner side Di of the core back 411. In this way, even if the fixed portion 84 that fixes the substrate 9 is disposed between the crossover wire 45 and the coil portion 43 in the radial direction, it is not necessary to detour around the fixed portion 84 when drawing the extension portion 441 of the conductive wire 44 toward the radially inner side Di of the fixed portion 84. Therefore, the extension portion 441 can be easily drawn toward the radially inner side Di from the coil portion 43 that is disposed on the radially outer side Do of the fixed portion 84.

[0056] In this embodiment, the opening 841 is a recess that recesses from the end of the fixing portion 84 on one axial direction D1 side toward the other axial direction D2 side. However, the present invention is not limited to this example, and the opening 841 may be a hole that extends in the radial direction, that is, it does not have to be open to the end of the fixing portion 84 on one axial direction D1 side.

[0057] <1-8-5. Second groove portion 85> The extension portion 441 of the conductive wire 44 is disposed in the second groove portion 85. As described above, the ring member 8 has the second groove portion 85. The second groove portion 85 is disposed on the end surface of the annular plate portion 81 on the one axial direction D1 side and recessed toward the other axial direction D2. The second groove portion 85 is composed of a pair of wall surfaces 851 and a bottom surface (reference numeral omitted) connecting the ends of the pair of wall surfaces 851 on the other axial direction D2 side. In other words, the pair of wall surfaces 851 are inner surfaces of the second groove portion 85 facing at least the circumferential direction. This eliminates the need to secure space for extending the extension portion 441 in the space on the one axial direction D1 side of the annular plate portion 81. This prevents the axial size of the motor 1 from increasing. Note that this example does not exclude a configuration in which the pair of wall surfaces 811 are not inner surfaces of the second groove portion 85. For example, the pair of wall surfaces 851 may be peripheral surfaces of a pair of circumferentially adjacent ribs. This rib may be disposed on the end face of the annular plate portion 81 on one axial direction D1 side in place of at least a part of the second groove portions 85, and protrudes in one axial direction D1 and extends radially.

[0058] <1-9. Circuit Board 9> The substrate 9 is disposed at the end of the ring member 8 on one axial side D1, and extends in a direction intersecting the axial direction. As described above, the motor 1 includes the substrate 9. By disposing the substrate 9 at the end of the ring member 8 on one axial side D1, the substrate 9 can be disposed compactly and with good workability.

[0059] At least a part of the substrate 9 is disposed radially outward Do from the core back 411. This allows the area of ​​the substrate 9 as viewed from the axial direction to be larger than in a configuration in which the entire substrate 9 is disposed radially inward Di from the core back 411.

[0060] For example, a sensor 91 is mounted on the end face 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 the teeth 412 adjacent to each other in the circumferential direction, and faces the magnet 33 in the radial direction.

[0061] <2. Vehicle 100> In this embodiment, the motor 1 is a so-called in-wheel motor, and is mounted on a vehicle 100. FIG. 4 is a conceptual diagram showing an example configuration of the vehicle 100. The vehicle 100 in FIG. 4 is an electric motorcycle. The vehicle 100 is equipped with a motor 1. In the vehicle 100, by arranging the crossover wires 45 that electrically connect the coil portions 43 radially inward Di of the core back 411, it is possible to suppress an increase in the axial size of the motor 1 mounted on the vehicle 100. However, the example of this embodiment does not exclude configurations in which the motor 1 is mounted on a vehicle 100 other than an electric motorcycle.

[0062] The vehicle 100 further includes a front wheel 110, a rear wheel 120, a body 130, a handlebar 140, an ECU (electronic control unit) 150, and a battery 160. The front wheel 110 and the rear wheel 120 are rotatably attached to the body 130. A motor 1 is disposed on the rear wheel 120. The rear wheel 120 has the motor 1 and a tire 121 attached to a rim 32 of the motor 1. The handlebar 140 is attached to the front of the body 130. The ECU 150 is disposed inside the body 130. The ECU 150 is a control device that controls each component of the vehicle 100, and controls, for example, the motor 1 and the battery 160. The battery 160 is disposed inside the body 130. The battery 160 is a chargeable and dischargeable secondary battery that supplies power to, for example, the motor 1 and the ECU 150. In this embodiment, a lithium-ion battery is used as the battery 160.

[0063] <3.Other> The embodiments of the present invention have been described above. However, the scope of the present invention is not limited to the above-described embodiments. The present invention can be implemented by adding various modifications to the above-described embodiments without departing from the spirit of the invention. Furthermore, the matters described in the above-described embodiments can be combined in any appropriate manner as long as no contradiction occurs. [Industrial Applicability]

[0064] The present invention is useful, for example, in a motor device in which coil portions arranged in the circumferential direction are connected by crossover wires. [Explanation of symbols]

[0065] 1 motor, 2 shaft, 3 rotor, 31 rotor cylindrical portion, 32 rim, 321 groove, 33 magnet, 4 stator, 41 stator core, 411 core back, 412 teeth, 42 insulator, 43 coil portion, 44 conducting wire, 441 extension portion, 45 crossover wire, 5 binding portion, 6 stator holder, 61 inner cylindrical portion, 62 holder cylindrical portion, 63 connection portion, 71 first cover member, 711 cover, 712 bearing holder, 713 bearing, 714 cylindrical portion, 715 end cap, 72 second cover, 721 cover, 722 Bearing holder, 723, bearing, 724, end cap, 8, ring member, 81, annular plate portion, 811, wall surface, 82, protrusion portion, 83, first groove portion, 831, cylindrical portion, 832, bottom plate portion, 8321, hole portion, 833, peripheral wall portion, 84, fixing portion, 841, opening portion, 85, second groove Part, 9... Circuit board, 91... Sensor, 100... Vehicle, 110... Front wheel, 120... Rear wheel, 121... Tire, 130... Body, 140... Steering wheel, 150... ECU, 160... Battery, CX... Center axis, D1... One axial direction, D2... Other axial direction, Di... Inward radial direction, Do... Outward radial direction

Claims

1. a rotor having a magnet surrounding a central axis extending in an axial direction and rotatable around the central axis; a stator having a core back disposed radially inward of the magnet and surrounding the central axis; a stator holder having a holder cylindrical portion that extends in the axial direction around the central axis and holds the core back on its radially outer surface; a ring member disposed at one axial end of the holder cylindrical portion and surrounding the central axis; a substrate disposed at one end of the ring member in the axial direction and extending in a direction intersecting the axial direction; Equipped with At least a portion of the substrate extends radially outward beyond the core back, The stator includes: a plurality of teeth extending radially outward from the core back and arranged in a circumferential direction; a plurality of coil portions each having a conductor disposed on one of the teeth; a crossover wire that electrically connects the different coil portions; and The ring member is a protrusion protruding radially outward at a radially outer end of the ring member; a cylindrical portion disposed on a radially inner surface of the stator holder and extending in an axial direction; a bottom plate portion extending radially inward from the other axial end portion of the cylindrical portion; and the crossover wire is disposed on one axial end surface of the bottom plate portion, the protrusion is disposed between the conductor and the tooth in the axial direction, a radially outer end of the protrusion is located radially inward of a radially outer end of the coil portion.

2. The protrusions are plural, The motor according to claim 1 , wherein at least some of the protrusions are arranged rotationally symmetrically with respect to the central axis.

3. Further provided is a bundling section for bundling the plurality of crossover wires, The motor according to claim 1 or 2, wherein the binding portion is connected to the ring member.

4. The conductor has an extension portion extending radially inward from the coil portion beyond the core back, The motor according to claim 1 , wherein the extending portion is connected to the connecting wire that is disposed radially inward of the holder cylindrical portion.

5. the ring member has an annular plate portion disposed at one axial end of the holder cylindrical portion, The annular plate portion has at least a pair of wall surfaces that face each other in the circumferential direction, the pair of wall surfaces extend from a radially outer end of the annular plate portion toward a radially inner end of the annular plate portion, The motor according to claim 4 , wherein the extension is disposed between the pair of walls.

6. the ring member further includes a groove in which the extension is disposed; the groove portion is disposed on one axial end surface of the annular plate portion and recessed toward the other axial end surface, The motor according to claim 5 , wherein the pair of wall surfaces are inner surfaces of the groove portion facing at least in the circumferential direction.

7. The ring member is a fixing portion that fixes the substrate; an opening extending through the fixing portion from a radially outer end to a radially inner end of the fixing portion; and the fixing portion is disposed between the connecting wire and the coil portion in the radial direction and extends in the circumferential direction, The motor according to claim 4 , wherein at least a portion of the extension portion extends from the coil portion through the opening radially inward beyond the core back.

8. A vehicle comprising the motor according to any one of claims 1 to 7.

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