JP7757082B2 - Motors and vehicles - Google Patents

Description

The present invention relates to a motor and a vehicle.

In conventional motors, multiple coils arranged circumferentially are connected by crossover wires. For example, each coil of the stator is wound around a core tooth that protrudes radially outward from the annular core yoke, and is connected in series by crossover wires. The crossover wires of each coil pass through a crossover wire storage section and connect to the next coil (see JP 2003-204645 A).

Japanese Patent Application Laid-Open No. 2003-204645

However, in JP 2003-204645 A, the crossover wire storage section is positioned above the core yoke section in the axial direction. This increases the axial size of the stator, making it difficult to prevent the motor's axial size from increasing.

The present invention aims to suppress an increase in the axial size of the motor.

An exemplary motor of the present invention comprises a rotor and a stator. The rotor is rotatable around a central axis extending in the axial direction. The stator faces the rotor in the radial direction. The rotor has a magnet surrounding the central axis. The stator has a core back, multiple teeth, multiple coil sections, and a crossover wire. The core back is positioned radially inward from the magnet and surrounds the central axis. The multiple teeth extend radially outward from the core back and are aligned circumferentially. A conductor is disposed on each of the teeth in the multiple coil sections. The crossover wire is positioned radially inward from the core back and electrically connects the different coil sections. The conductor wire has an extension portion extending from the coil section radially inward from the core back. The extension portion is connected to the crossover wire.

An exemplary vehicle of the present invention is equipped with the motor described above.

The exemplary motor and vehicle of the present invention can suppress an increase in the axial size of the motor.

FIG. 1 is an enlarged cross-sectional view of a main part of the motor. FIG. 2 is a cross-sectional view of the motor. FIG. 3 is an external view of the ring member. FIG. 4 is a conceptual diagram showing an example of the configuration of a vehicle equipped with a motor.

An exemplary embodiment is described below with reference to the drawings.

In this specification, the direction parallel to the central axis CX of the motor 1 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 "radial inward direction Di," and the direction away from the central axis CX is referred to as the "radial outward direction Do."

In addition, in this specification, "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.

Furthermore, in the positional relationship between one direction, line, or plane and another, "parallel" not only refers to a state in which the two do not intersect at all no matter how far they are extended, but also includes a state in which they are substantially parallel. Furthermore, "perpendicular" and "orthogonal" not only refer to a state in which the two intersect at 90 degrees, but also include 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 that does not deviate from the spirit of this invention.

Note that these are names used solely for explanatory purposes and are not intended to limit the actual positional relationships, directions, names, etc.

<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.

The motor 1 comprises 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.

<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 to, for example, a body 130 of the vehicle 100 (see FIG. 4 described later) so as not to rotate.

<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.

The rim 32 is annular and surrounds the central axis CX, and is disposed radially outward Do of the rotor tubular portion 31. In this embodiment, the rim 32 is integral with the rotor tubular portion 31, but it may be a separate member from the rotor tubular portion 31. A tire 121 (see FIG. 4, described below) 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 portion of the tire 121 (for example, an air tube) is housed in the groove 321.

The rotor 3 also has a magnet 33 surrounding the central axis CX. The magnet 33 is arranged 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 be configured to include multiple magnetic pieces arranged in the circumferential direction.

<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, conductor wires 44, and connecting 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.

The insulators 42 are formed from an electrically insulating material such as resin and are arranged at both axial ends of the stator core 41. Each insulator 42 has an annular portion 421 and multiple pieces 422. The annular portion 421 is annular and surrounds the central axis CX, and is arranged at the axial end of the core back 411. The multiple pieces 422 protrude radially outward Do from the annular portion 421 and are aligned circumferentially. Each piece 422 is arranged at the axial end of a tooth 412.

The coil portion 43 is a component in which a conductor 44 is arranged on each tooth 412. As described above, the stator 4 has multiple coil portions 43. When a drive current is supplied to each coil portion 43, the stator 4 is excited and drives the rotor 3.

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

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 positioned 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 radially inward Di from the coil portion 43 to connect with the crossover wires 45. By positioning the crossover wires 45 radially inward Di from the core back 411, it is not necessary to secure space for the crossover wires 45 axially outside the core back 411. This prevents the axial size of the motor 1 from increasing.

Furthermore, the crossover wires 45 are positioned radially inward Di from the holder tubular portion 62 of the stator holder 6, which will be described later. This eliminates the need to secure space for the crossover wires 45 on the one axial direction D1 side of the holder tubular portion 62. This prevents the axial size of the motor 1 from increasing.

In this embodiment, the crossover wire 45 is part of the conductor wire 44. In other words, the conductor wire 44 has the crossover wire 45. However, this is not limiting, and the crossover wire 45 may be a separate member from the conductor wire 44.

<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 wrapped around the bundle of multiple crossover wires 45 together with a portion of a bottom plate portion 832 (described later) of the first groove portion 83 to form a ring-shaped connection. 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 crossover wire 45 can be more reliably prevented from interfering with other components.

<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.

The inner cylindrical portion 61 is cylindrical and extends axially around the central axis CX, and is fixed to the end face of the shaft 2 on the radially outer side Do.

The holder cylindrical portion 62 is positioned radially outward Do from the inner cylindrical portion 61. The holder cylindrical portion 62 extends axially 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 a stator holder 6.

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

<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.

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

The bearing holder 712 is cylindrical and surrounds the shaft 2, extending from the radially inward end Di of the cover 711 in the other axial direction D2. The bearing holder 712 holds the bearing 713 and rotatably supports the shaft 2 via the bearing 713.

The cylindrical portion 714 is cylindrical and surrounds the shaft 2, extending in one axial direction D1 from the end of the cover 711 on the radially inward Di side. An end cap 715 is disposed on the inner peripheral 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., in one axial direction D1), dust, liquid, etc. can be prevented from entering the interior of the motor 1 through the space between the shaft 2 and the cylindrical 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 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.

The cover 721 has an annular shape that surrounds the shaft 2, is positioned on the other axial side D2 of the stator 4, and extends radially. The end of the cover 721 on the radially outer side Do is connected to the end of the rotor cylindrical portion 31 on the other axial side D2.

The bearing holder 722 is cylindrical and surrounds the shaft 2, extending from the radially inward end Di of the cover 721 in the other axial direction D2. The bearing holder 722 holds the bearing 723 and rotatably supports the shaft 2 via the bearing 723.

Furthermore, on the inner surface of the bearing holder 722, an end cap 724 is positioned further in the 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 positioning the end cap 724 outside the bearing 723 (i.e., on the axial direction D2), it is possible to prevent dust, liquids, etc. from entering the interior of the motor 1 through the space between the shaft 2 and the bearing holder 722.

<1-8. Ring member 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, the present invention is not limited to this example, and the ring member 8 may be integral 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. 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 continuously connected without any gaps over the entire circumferential area centered on the central axis CX, or may have one or more gaps 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.

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 the end of the annular plate portion 81 on the radially outer side Do to the end on the radially inner side Di. The extension portion 441 of the conductor 44 is positioned between the pair of wall surfaces 811. In this way, the pair of wall surfaces 811 can radially guide the extension portion 441 of the conductor 44 that extends from the coil portion 43 radially inward Di from the holder tube portion 62. Therefore, the extension portion 441 can be pulled out smoothly and compactly toward the radially inner side Di from the core back 411.

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 at least a portion of the other of the pair of wall surfaces 851. In this way, the extension portion 441, which is 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.

<1-8-2. Projection 82>
The protrusions 82 protrude radially outward Do from the end of the ring member 8 on the radially outward 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 outward Do side and is aligned in the circumferential direction.

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

As shown in FIG. 1, preferably, the radially outer Do end of the protrusion 82 is located radially inward Di of the radially outer Do end of the coil portion 43. This allows the number of turns of the wire 44 in the portion of the tooth 412 that is radially outer Do of the protrusion 82 and radially inward Di of the radially outer Do end of the coil portion 43 to be greater than the portion of the tooth 412 that is radially inner Di of the radially outer Do end of the protrusion 82, without changing the axial position of the end of the coil portion 43 on one axial side D1. Therefore, a reduction in the number of turns of the coil portion 43 due to the positioning of the protrusion 82 can be suppressed. However, this example does not exclude a configuration in which the radially outer Do end of the protrusion 82 is not located radially inward Di of the radially outer Do end of the coil portion 43.

Furthermore, as shown in FIG. 3, preferably, at least some of the protrusions 82 are arranged rotationally symmetrically with respect to the central axis CX. In other words, 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 that they overlap when rotated by (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.

<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.

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 the end of the annular plate portion 81 on the radially inward side Di in the other axial direction D2. The bottom plate portion 832 is annular and surrounds the central axis CX, and extends radially inward Di from the end of the tubular portion 831 on the other axial direction D2. The peripheral wall portion 833 is positioned radially inward Di from the holder tubular portion 62 and the crossover wire 45. The ring member 8 has a circumferential wall portion 833. The circumferential wall portion 833 protrudes in one axial direction D1 from the end of the ring member 8 on the radially inward side Di and extends circumferentially. For example, in this embodiment, the circumferential wall portion 833 extends in one axial direction D1 from the end of the bottom plate portion 832 on the radially inward side Di. The peripheral wall portion 833 also extends circumferentially and, in this embodiment, is cylindrical and surrounds the central axis CX. By having the peripheral wall portion 833 in the ring member 8, the peripheral wall portion 833 can prevent the crossover wire 45 from moving radially inward Di.

As described above, the peripheral wall portion 833 is part of the first groove portion 83. This allows the crossover wire 45 to be accommodated in the first groove portion 83, more reliably preventing the crossover wire 45 from moving radially inward Di and preventing the crossover wire 45 from interfering with other components.

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, if 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.

<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.

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 an opening 841. At least a portion of the extension portion 441 extends from the coil portion 43 through the opening 841 radially inward Di of the core back 411. In this way, even if the fixed portion 84 that secures the substrate 9 is disposed radially between the crossover wire 45 and the coil portion 43, it is not necessary to detour around the fixed portion 84 when pulling the extension portion 441 of the conductor 44 radially inward Di of the fixed portion 84. Therefore, the extension portion 441 can be easily pulled out radially inward Di from the coil portion 43 that is disposed radially outward Do of the fixed portion 84.

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

<1-8-5. Second groove portion 85>
The extension portion 441 of the conducting 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 on the one axial direction D1 side of the annular plate portion 81 to extend the extension portion 441. 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 arranged on the end face of the annular plate portion 81 on the one axial direction D1 side in place of at least a part of the second groove portions 85, and protrudes in the one axial direction D1 and extends radially.

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

At least a portion of the substrate 9 is positioned 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 positioned radially inward Di from the core back 411.

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

<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 the motor 1. In the vehicle 100, by arranging the crossover wires 45 that electrically connect the coil portions 43 radially inward Di from 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 a configuration in which the motor 1 is mounted on a vehicle 100 other than an electric motorcycle.

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 a 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 rechargeable secondary battery that supplies power to, for example, the motor 1 and the ECU 150. In this embodiment, a lithium-ion battery is used for the battery 160.

<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.

The present invention is useful, for example, in motor devices in which circumferentially arranged coil sections are connected by crossover wires.

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...Conductor, 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...Cylinder 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 portion, 9: substrate, 91: sensor, 100: vehicle, 110: front wheel, 120: rear wheel, 121: tire, 130: vehicle body, 140: handlebar, 150: ECU, 160: battery, CX: center axis, D1: one axial direction, D2: other axial direction, Di: inward radial direction, Do: outward radial direction

Claims (13)

a rotor rotatable about a central axis extending in the axial direction;
a stator radially opposed to the rotor;
a stator holder;
A ring member;
Equipped with
The rotor has a magnet surrounding the central shaft,
The stator includes:
a core back 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 each having a conductor disposed on one of the teeth;
a crossover wire disposed radially inward of the core back and electrically connecting the different coil portions;
and
the conducting wire has an extension portion extending from the coil portion radially inward beyond the core back,
the extension portion is connected to the crossover wire,
the stator holder has a holder cylindrical portion that extends in the axial direction 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 cylindrical portion and surrounds the central axis;
The ring member is
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 . Further, a bundling section for bundling the plurality of crossover wires is provided,
The motor of claim 1 , wherein the binding portion is connected to the ring member. The motor according to claim 2 , wherein the binding portion is connected to the other axial end surface of the bottom plate portion . 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 1 , wherein the extension portion is disposed between the pair of wall surfaces. a rotor rotatable about a central axis extending in the axial direction;
a stator radially opposed to the rotor;
a stator holder;
A ring member;
Equipped with
The rotor has a magnet surrounding the central shaft,
The stator includes:
a core back 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 each having a conductor disposed on one of the teeth;
a crossover wire disposed radially inward of the core back and electrically connecting the different coil portions;
and
the conducting wire has an extension portion extending from the coil portion radially inward beyond the core back,
the extension portion is connected to the crossover wire,
the stator holder has a holder cylindrical portion that extends in the axial direction 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 cylindrical portion and surrounds the central axis;
the connecting wire is disposed radially inward of the holder cylindrical portion,
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 extension is disposed between the pair of walls. The motor according to claim 4 or 5 , wherein the extension portion is in contact with at least a portion of one of the pair of wall surfaces and is in contact with at least a portion of the other of the pair of wall surfaces. 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 4 , wherein the pair of wall surfaces are inner surfaces of the groove portion facing at least in the circumferential direction. a substrate disposed at one end of the ring member in the axial direction and extending in a direction intersecting the axial direction;
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 1 , wherein at least a portion of the extension portion extends from the coil portion through the opening radially inward beyond the core back. a rotor rotatable about a central axis extending in the axial direction;
a stator radially opposed to the rotor;
a stator holder;
A ring member;
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
The rotor has a magnet surrounding the central shaft,
The stator includes:
a core back 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 each having a conductor disposed on one of the teeth;
a crossover wire disposed radially inward of the core back and electrically connecting the different coil portions;
and
the conducting wire has an extension portion extending from the coil portion radially inward beyond the core back,
the extension portion is connected to the crossover wire,
the stator holder has a holder cylindrical portion that extends in the axial direction 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 cylindrical portion and surrounds the central axis;
the connecting wire is disposed radially inward of the holder cylindrical portion,
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,
At least a portion of the extension portion extends radially inward from the coil portion through the opening beyond the core back. The motor according to claim 8 or 9 , wherein at least a portion of the substrate is disposed radially outward from the core back. the ring member has a protrusion that protrudes radially outward at a radially outer end of the ring member,
The motor according to claim 1 , wherein the protrusion is disposed between the conductor and the tooth in the axial direction. a rotor rotatable about a central axis extending in the axial direction;
a stator radially opposed to the rotor;
a stator holder;
A ring member;
Equipped with
The rotor has a magnet surrounding the central shaft,
The stator includes:
a core back 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 each having a conductor disposed on one of the teeth;
a crossover wire disposed radially inward of the core back and electrically connecting the different coil portions;
and
the conducting wire has an extension portion extending from the coil portion radially inward beyond the core back,
the extension portion is connected to the crossover wire,
the stator holder has a holder cylindrical portion that extends in the axial direction 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 cylindrical portion and surrounds the central axis;
the connecting wire is disposed radially inward of the holder cylindrical portion,
the ring member has a protrusion that protrudes radially outward at a radially outer end of the ring member,
The protrusion is disposed between the conductor and the teeth in the axial direction. A vehicle equipped with the motor described in any one of claims 1 to 12.