Stator and motor

Abstract

A stator and a motor capable of avoiding physical interference of arranged electronic components. The stator has a stator core, an insulator, a coil, a circuit substrate, and a spacer. The stator core has an annular core back surrounding a central axis in the circumferential direction and a plurality of teeth extending radially from the core back and arranged in the circumferential direction. The insulator covers at least a portion of the stator core. The coil is mounted on the teeth via the insulator. The circuit substrate is mounted with electronic components and is arranged on one axial side of the stator core. In the axial direction, the spacer is arranged between the circuit substrate and the stator core. The circuit substrate is connected to the spacer. The electronic components are arranged on the mounting surface of the circuit substrate facing the spacer side.

Description

Technical Field

[0001] The present disclosure relates to a stator and a motor. Background Art

[0002] In the brushless motor of Patent Document 1, a stator having a plurality of salient poles arranged radially includes a magnetic pole detection sensor for detecting the magnetic poles of a magnet provided on a rotor, and switching control of energizing the coils of each salient pole is performed based on a detection signal from the magnetic pole detection sensor. The brushless motor of Patent Document 1 includes a sensor holder for holding the magnetic pole detection sensor in a state opposite to the magnet, and includes a fixing unit capable of attaching and detaching the sensor holder relative to the stator.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2003-264971 Utility Model Content

[0006] In addition to the magnetic pole detection sensor, multiple components such as connectors are also configured in the stator of the brushless motor of Patent Document 1. In the stator, the space in which multiple components can be configured is limited, so it is necessary to configure the components while avoiding physical interference between the multiple components or between the multiple components and the stator.

[0007] The present disclosure is made in view of the above technical problems, and an object thereof is to provide a stator and a motor capable of avoiding physical interference of arranged electronic components.

[0008] An exemplary stator disclosed in the present invention has a stator core, an insulator, a coil, a circuit substrate, and a spacer. The stator core has an annular core back that surrounds a central axis in the circumferential direction, and a plurality of teeth that extend radially from the core back and are arranged in the circumferential direction. The insulator covers at least a portion of the stator core. The coil is mounted on the teeth via the insulator. The circuit substrate is mounted with electronic components and is arranged on one axial side of the stator core. In the axial direction, the spacer is arranged between the circuit substrate and the stator core. The circuit substrate is connected to the spacer. The electronic components are arranged on the mounting surface of the circuit substrate that faces the spacer side.

[0009] An exemplary motor of the present disclosure includes the above-described stator and a rotor that is radially opposed to the stator and rotates around the stator.

[0010] The exemplary stator disclosed in the present invention has a stator core, an insulator, a coil, a stator holder, an insulating plate, a circuit substrate, and a spacer. The stator core has an annular core back surrounding a central axis in the circumferential direction and a plurality of teeth extending radially from the core back and arranged in the circumferential direction. The insulator covers at least a portion of the stator core. The coil is mounted on the teeth via the insulator. The stator holder holds one axial side of the core back via the insulator. The insulating plate covers one axial side of the stator holder. The circuit substrate is mounted with electronic components and is arranged on one axial side of the stator core. In the axial direction, the spacer is arranged between the circuit substrate and the stator core. The circuit substrate is connected to the spacer. The insulating plate has a support portion and a groove portion. The support portion is in contact with the mounting surface of the circuit substrate facing the spacer side to support the circuit substrate. The groove portion is recessed relative to the support portion. A portion of the jumper wire connected to the coil is arranged in the groove portion.

[0011] An exemplary motor of the present disclosure includes the above-described stator and a rotor that is radially opposed to the stator and rotates around the stator.

[0012] An exemplary motor of the present disclosure has a shaft, a stator, and a rotor. The shaft extends in an axial direction along a central axis. The stator is fixed to the shaft. The rotor rotates around the stator. The stator has a stator core, an insulator, a coil, a stator holder, a circuit substrate, and a spacer. The stator core has an annular core back surrounding the central axis in the circumferential direction and a plurality of teeth extending radially from the core back and arranged in the circumferential direction. The insulator covers at least a portion of the stator core. The coil is mounted on the teeth via the insulator. The stator holder holds the stator and the shaft. The circuit substrate is mounted with electronic components and is arranged on one axial side of the stator core. In the axial direction, the spacer is arranged between the circuit substrate and the stator core. The circuit substrate is connected to the spacer. The rotor has an annular rim, an annular yoke, a magnet, a connection portion, and a bearing. The rim surrounds the radial outer periphery of the stator. The yoke is connected to the rim and is arranged radially inward of the rim. The magnet is arranged on the radial inner side of the yoke and opposite to the stator. The connecting portion is connected to the rim or the yoke. The bearing supports the connecting portion so as to be rotatable relative to the shaft. The connecting portion has a cover and a partition. The cover covers the side of the stator on which the circuit substrate is arranged. The partition extends axially from the cover and is located at a portion between the yoke and the stator. The spacer is located between the cover and the stator. The end of the spacer on the stator side is located radially outward than the end of the spacer on the cover side.

[0013] According to the exemplary present disclosure, physical interference of configured electronic components can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a diagram showing the appearance of a motor according to an exemplary embodiment.

[0015] Figure 2 is a diagram showing a cross section along a rotation axis of a motor according to an exemplary embodiment.

[0016] Figure 3 is an exploded view showing the interior of a motor according to an exemplary embodiment.

[0017] Figure 4 is an exploded view showing a stator of an exemplary embodiment.

[0018] Figure 5 is an exploded view showing a stator of an exemplary embodiment.

[0019] Figure 6 yes Figure 4 An enlarged view of the stator from another angle.

[0020] Figure 7 It is a figure which shows the mounting surface of a circuit board.

[0021] Figure 8 This is a diagram showing a surface opposite to the mounting surface in a modified example of the circuit board.

[0022] Fig. 9 FIG. 1 is an enlarged view of a sensor unit in a cross section along a rotation axis of a motor according to an exemplary embodiment.

[0023] Fig.10 Yes Fig. 9 A further enlarged image.

[0024] Fig.11 is an exploded view showing the sensor unit.

[0025] (Explanation of symbols)

[0026] 1: Motor

[0027] 10: Stator

[0028] 13: Stator retainer

[0029] 13a: Through hole

[0030] 20: Rotor

[0031] 21: Yoke

[0032] 22: Magnet

[0033] 23: Hood

[0034] 23a: First hood

[0035] 23b: Second hood

[0036] 24: Bearings

[0037] 25: Rim

[0038] 26: Connection

[0039] 30: Axis

[0040] 41: Sensor

[0041] 41B: Sensor body

[0042] 41L: Lead wire

[0043] 42: Circuit board

[0044] 43: Spacer

[0045] 121: stator core

[0046] 121a: Core back

[0047] 121b: Tooth

[0048] 122: Insulator

[0049] 123: Coil

[0050] 124: Insulation board

[0051] 124B: Support

[0052] 124C: Groove

[0053] 124D: Groove

[0054] 231a: First partition

[0055] 231b: Second partition

[0056] 421: Circuit Elements

[0057] 421B: Component body

[0058] 421L: Wire section

[0059] 422: Circuit Elements

[0060] 422B: Component body

[0061] 422L: Wire section

[0062] 423: Circuit Elements

[0063] 423B: Component body

[0064] 431: Base

[0065] 431h: Hole

[0066] 432: Wall

[0067] 433: Substrate support

[0068] C: Circumferential

[0069] CA1: Jumper wire

[0070] CA2: Jumper cable

[0071] J1: Resin material

[0072] M1: Open

[0073] R: Radial

[0074] S1: Mounting surface

[0075] S2: Surface

[0076] Z: Axial

[0077] Z1: Axial side

[0078] Z2: The other side of the axis DETAILED DESCRIPTION

[0079] The following describes an exemplary embodiment of the present disclosure with reference to the accompanying drawings. In addition, the same reference symbols are marked for the same or corresponding parts in the figures, and the description is not repeated. In this specification, for ease of understanding, the direction substantially parallel to the rotating axis of the motor is recorded as the axial direction Z, one side of the axial direction Z is recorded as the axial one side Z1, and the other side of the axial direction Z is recorded as the axial other side Z2. In addition, the radial direction centered on the axial direction Z is recorded as the radial direction R, and the circumferential direction centered on the axial direction Z is recorded as the circumferential direction C. However, the directions are defined only for the convenience of description, and the orientation of the motor of the present disclosure when in use is not limited, except for cases where it is particularly necessary to define the horizontal direction and the vertical direction. In addition, in the present application, "orthogonal directions" also include substantially orthogonal directions.

[0080] Reference Figure 1 to Figure 3 , a motor 1 according to an exemplary embodiment will be described. Figure 1 is a diagram showing the appearance of a motor 1 according to the exemplary embodiment. Figure 2 1 is a diagram showing a cross section along the rotation axis of the motor 1 according to the exemplary embodiment. Figure 3 is an exploded view showing the interior of the motor 1 according to the exemplary embodiment.

[0081] As an example, the motor 1 is used in a wheel of a four-wheeled vehicle or a two-wheeled vehicle. Typically, the motor 1 is used as an in-wheel motor mounted on an axle of the four-wheeled vehicle or the two-wheeled vehicle.

[0082] like Figure 1 As shown, the motor 1 has a shaft 30 as a rotating shaft, a stator 10, and a rotor 20. In the case of an in-wheel motor, the shaft 30 constitutes a vehicle axle. The stator 10 is cylindrical and fixed to the shaft 30. The rotor 20 rotates relative to the stator 10. Specifically, the rotor 20 rotates around the stator 10 with the shaft 30 as an axis.

[0083] [Rotor]

[0084] like Figure 2 and Figure 3 As shown, the rotor 20 has a yoke 21, a plurality of magnets 22, a rim 25 and a connecting portion 26. The rim 25 is an annular member surrounding the outer periphery of the stator 10. For example, the rim 25 is equipped with a tire not shown. The yoke 21 is a cylindrical, i.e., annular, iron member arranged along the inner circumferential surface of the rim 25. The yoke 21 is connected to the rim 25 by welding. In addition, as an alternative to welding, aluminum or resin materials can also be used to cover and fix the yoke 21 to the rim 25 by insert molding. On the inner circumferential surface of the yoke 21, a plurality of magnets 22 are arranged along the inner circumferential surface. Specifically, the plurality of magnets 22 are arranged in an alternating manner of N poles and S poles along the circumferential direction on the inner circumferential surface of the yoke 21. The magnet 22 is, for example, composed of a rectangular permanent magnet. In the embodiment, a plurality of magnets are arranged, but it can also be arranged to alternate N poles and S poles using a circular ring-shaped magnet.

[0085] The connecting portion 26 connects the rim 25 to the shaft 30 so that it can rotate. Specifically, the connecting portion 26 has a cover 23 and a pair of bearings 24. The cover 23 covers the rim 25, the yoke 21, and both ends of the stator 10 in the axial direction. In the embodiment, the cover 23 is connected to the yoke 21 by screws. However, the cover 23 can also be connected to the rim 25. In addition, it is not limited to Figure 3 The cover 23 may also connect a pair of bearings 24 and the yoke 21 .

[0086] In the present embodiment, the cover 23 includes a first cover 23a and a second cover 23b. The first cover 23a covers the rim 25, the yoke 21, and one axial side Z1 of the stator 10. The second cover 23b covers the rim 25, the yoke 21, and the other axial side Z2 of the stator 10. Each of the first cover 23a and the second cover 23b includes a cylindrical portion 23c. For example, the brake mechanism 27 is disposed on the second cover 23b. In the embodiment, the first cover 23a, the second cover 23b, and the rim 25 are different components, but it is also possible that either the first cover 23a or the second cover 23b and the rim 25 are constituted by a single component.

[0087] The cylindrical portion 23c surrounds the shaft 30 and extends in the axial direction Z. The cylindrical portion 23c holds the bearing 24 therein. The bearing 24 rotatably supports the first cover 23a or the second cover 23b with respect to the shaft 30. The more detailed structure of the rotor 20 is described below.

[0088] [stator]

[0089] Next, refer to Figure 3 to Figure 5 , a stator 10 according to an exemplary embodiment will be described. Figure 4 and Figure 5 1 is an exploded view showing the stator 10 of an exemplary embodiment. For ease of understanding, Figure 4 and Figure 5 The coil 123 which is a part of the stator 10 is omitted.

[0090] like Figure 3 to Figure 5 As shown, the stator 10 includes a stator holder 13 , a stator core 121 , an insulator 122 , a coil 123 , an insulating plate 124 , and a sensor unit 40 .

[0091] The stator holder 13 is a disc-shaped pressed product made of metal, and has a through hole 13 a penetrating in the axial direction Z. For example, the shaft 30 is press-fitted into the through hole 13 a , and the shaft 30 is fixed to the stator holder 13 .

[0092] The stator core 121 is annular and fixed to the outer periphery of the stator holder 13. The stator core 121 is arranged inside the magnet 22 in the radial direction R with a gap therebetween. The center of the stator core 121 substantially coincides with the central axis of the shaft 30.

[0093] The stator core 121 is formed by stacking a plurality of core components in the axial direction Z. The core components are formed of, for example, magnetic steel plates. Figure 5 As shown, the stator core 121 has a core back 121 a and teeth 121 b .

[0094] The core back 121a and the teeth 121b are integrally formed. The core back 121a surrounds the central axis of the shaft 30 in the circumferential direction C and is formed in an annular shape. The teeth 121b extend from the outer surface of the core back 121a in the radial direction R to the outer side in the radial direction R. The plurality of teeth 121b are arranged in the circumferential direction C at equal intervals.

[0095] The insulator 122 covers at least a portion of the stator core 121. The insulator 122 is an insulating member that electrically insulates the stator core 121 from the coil 123. For example, the insulator 122 is formed of an insulating resin. The insulator 122 is attached to each tooth 121b.

[0096] Specifically, the insulator 122 is disposed on both ends of the core back 121a in the axial direction Z and on both ends of each tooth 121b in the axial direction Z. In addition, the insulator 122 is also disposed on the surface of each tooth 121b along the circumferential direction C and the outer surface of the core back 121a in the radial direction R.

[0097] The coil 123 is attached to the tooth 121b via the insulator 122. The coil 123 is formed by winding a conductive wire around each tooth 121b via the insulator 122. A plurality of coils 123 are arranged in the circumferential direction C.

[0098] When a drive circuit is applied to the coil 123 , the plurality of teeth 121 b generate magnetic flux, thereby generating torque in the circumferential direction C due to attraction and repulsion between the teeth 121 b and the magnet 22 . As a result, the rotor 20 rotates about the shaft 30 relative to the stator 10 .

[0099] As described above, the stator holder 13 holds the axial one side Z and the axial other side Z2 of the core back 121a via the insulator 122. The insulating plate 124 covers the axial one side Z1 of the radial outer end of the stator holder 13. In other words, the insulating plate 124 is arranged on the axial one side Z1 of the core back 121a, and covers the axial one side Z1 of the core back 121a via the insulator 122. The insulating plate 124 is an insulating member that electrically insulates the stator holder 13 from the jumper wires CA1 and CA2 connected to the coil described below. For example, the insulating plate 124 is formed of an insulating resin. In addition, the insulating plate 124 and the insulator 122 can also be formed integrally.

[0100] [Sensor unit]

[0101] In the present embodiment, the sensor unit 40 is arranged on one axial side Z1 of a part of the teeth 121b among the plurality of teeth 121b. The sensor unit 40 includes a sensor 41, a circuit substrate 42, and a spacer 43. The sensor 41 is mounted on a mounting surface S1 of the circuit substrate 42 facing the other axial side Z2, and detects the state of the rotor 20 or the state of the coil 123. Detecting the state of the rotor 20 may include, for example, detecting the rotational position of the rotor 20 in the circumferential direction C by a Hall sensor or an encoder, or detecting the rotational speed of the rotor 20. Detecting the state of the coil 123 may include, for example, detecting the temperature of the coil 123 by a thermistor. The sensor 41 is not limited to the above-mentioned sensors, and the state detected by the sensor is not limited to the above-mentioned state. In the present embodiment, the sensor 41 is an example of an electronic component.

[0102] The spacer 43 is connected to the mounting surface S1 side of the circuit board 42. The spacer 43 is arranged between the circuit board 42 and the stator core 121 in the axial direction Z. That is, the circuit board 42 is arranged on the axial side Z1 of the stator core 121 via the spacer 43.

[0103] The spacer 43 has a base portion 431. The sensor 41 is fixed to the base portion 431. That is, the base portion 431 holds the sensor 41. In other words, the base portion 431 accommodates the sensor 41. The base portion 431 is an example of a accommodating portion. In the present embodiment, three sensors 41 are arranged and fixed along the circumferential direction C on the end surface of the other axial side Z2 of the base portion 431. Each sensor 41 is arranged in the gap between the teeth 121b adjacent to each other in the circumferential direction C. For example, when the sensor 41 detects the rotational position of the rotor 20 in the circumferential direction C, the detection signal of each sensor 41 is sent to the control circuit of the motor 1 not shown in the figure to control the states of the coils 123 corresponding to the U phase, V phase, and W phase, respectively.

[0104] [Installation of sensor unit]

[0105] Next, refer to Figures 4 to 6 , the sensor unit 40 is described. Figure 6 yes Figure 4 An enlarged view of the stator 10 from another angle. Figure 6 This is a diagram of the sensor unit 40 attached to the stator 10 as viewed from the shaft 30 side toward the outside in the radial direction R.

[0106] like Figure 6 As shown, in the sensor unit 40, the circuit substrate 42 is held on the stator core 121 by the insulating plate 124 and the spacer 43. The insulating plate 124 has a base plate 124A, three support portions 124B and three groove portions 124C. The base plate 124A is a member having a ring shape along the core back 121a of the stator core 121. The support portion 124B protrudes from the surface of the axial side Z1 of the base plate 124A toward the axial side Z1. The three support portions 124B are arranged along the circumferential direction C on the end surface of the axial side Z1 of the base plate 124A. The three support portions 124B are in contact with the mounting surface S1 of the circuit substrate 42, and support the circuit substrate 42 on the opposite side of the spacer 43 with respect to the radial direction R. Specifically, when the protrusion 124P provided on the support portion 124B is inserted into the hole 42 h hollowed out in the circuit substrate 42 , the sensor unit 40 including the circuit substrate 42 is fixed to the stator core 121 .

[0107] Two grooves 124C are arranged between each of the three support parts 124B. The grooves 124C are recessed toward the other axial side Z2 relative to the surface of the support part 124B on the one axial side Z1. The grooves 124D are arranged in at least one of the circumferential directions C of the support parts 124B located on the outside among the three support parts 124B. For example, the bottom surfaces of the grooves 124C and the grooves 124D facing the one axial side Z1 are located at a position more recessed than the surface of the base plate 124A on the one axial side Z1.

[0108] A portion of the jumper wires CA1 and CA2 connected to the coil 123 is disposed in the groove portion 124C. The jumper wires CA1 and CA2 are connected to a power supply wire (not shown) to allow an external current to flow to the coil 123. Figure 6 Although not shown, a portion of the jumper wire connected to the coil 123 may be arranged in the groove 124D. In this way, the groove 124C that is recessed from the support 124B is provided between the support 124B connected to the circuit board, thereby ensuring space for wiring the jumper wires CA1 and CA2. As a result, it is possible to avoid interference between the jumper wires CA1 and CA2 and the electronic components, and to use a thicker wire diameter for the jumper wire so that a larger current can flow.

[0109] Next, refer to Figure 7 , the circuit substrate 42 is described. Figure 7 1 is a diagram showing a mounting surface S1 of the circuit board 42 .

[0110] The mounting surface S1 of the circuit substrate 42 is mounted with three sensors 41, a circuit element 421, and a circuit element 422. Specifically, the sensor 41 includes a sensor body 41B and a lead portion 41L extending from the sensor body 41B. The end portion of the lead portion 41L on the opposite side from the sensor body 41B is mounted on the mounting surface S1 by soldering. The sensor body 41B is located away from the mounting surface S1 of the circuit substrate 42 toward the other axial side Z2. The sensor 41, the circuit element 421, and the circuit element 422 are examples of electronic components.

[0111] The circuit element 421 includes an element body 421B and a lead portion 421L extending from the element body 421B. The end of the lead portion 421L on the opposite side of the element body 421B is mounted on the mounting surface S1 by soldering. The element body 421B side of the lead portion 421L is arranged along the mounting surface S1. As a result, the element body 421B is arranged lying along the mounting surface S1.

[0112] The circuit element 422 has an element body 422B and a lead portion 422L extending from the element body 422B. The end of the lead portion 422L on the opposite side of the element body 422B is mounted on the mounting surface S1 by soldering. The element body 422B side of the lead portion 422L is arranged along the mounting surface S1. As a result, the element body 422B is arranged lying along the mounting surface S1.

[0113] By installing the sensor 41, circuit element 421 and circuit element 422 on the mounting surface S1 on the other axial side Z2 of the circuit substrate 42, the circuit elements can be prevented from protruding to the side opposite to the mounting surface S1, and interference between the cover 23 and the circuit elements 421 and 422 located on the axial side Z1 of the circuit substrate 42 can be prevented.

[0114] Furthermore, by laying out the circuit elements 421 and 422 along the mounting surface S1 , the thickness of the circuit substrate 42 including the mounted circuit elements in the axial direction Z can be suppressed, and the stator 10 including the sensor unit 40 can be miniaturized in the axial direction Z.

[0115] In this embodiment, the component body 421B and the component body 422B are located at a position exposed from the circuit substrate 42 when viewed from the surface S2 side opposite to the mounting surface S1. Thus, the position of the component body 421B and the component body 422B can be visually confirmed, so it is easy to arrange the component body 421B and the component body 422B at an appropriate position.

[0116] In addition, the element body 421B and the element body 422B may be covered with a resin material J1 for insulation, heat conduction, or moisture prevention. Figure 7 In the figure, the oblique lines show the state where the element body 421B and the element body 422B are covered with the resin material J1. Since the element body 421B and the element body 422B exposed from the circuit substrate 42 are covered with the resin material J1, the resin material J1 can be applied even after the sensor unit 40 is mounted on the stator 10, thereby improving the working efficiency.

[0117] Next, refer to Figure 8 , a modified example of the component configuration in the circuit substrate 42 is described. Figure 8 This is a diagram showing a surface S2 on the opposite side to the mounting surface S1 in a modified example of the circuit board 42 .

[0118] In a modified example of the circuit substrate 42, a circuit element 423 is mounted on the mounting surface S1 instead of the circuit element 421 and the circuit element 422. The circuit element 423 has an element body 423B and a lead portion (not shown) extending from the element body 423B. The circuit element 423 is mounted on the mounting surface S1 by soldering, similarly to the circuit elements 421 and the circuit elements 422. The element body 423B is arranged lying along the mounting surface S1. The element body 423B is arranged to be exposed from the opening M1 of the circuit substrate 42.

[0119] In addition, for example, Figure 6 A portion of the jumper wire CA1 shown is located in the opening M1. By having the opening M1, the jumper wire CA1 can be located at a position closer to the axial side Z1 than the surface S2 of the circuit board 42, so that a space for wiring the jumper wire CA1 can be ensured. As a result, it is possible to avoid interference between the jumper wire CA1 and the electronic components, and a thicker wire diameter can be used for the jumper wire to allow a larger current to flow.

[0120] Next, refer to Fig. 9 and Fig.10, the spacer 43 is described in detail. Fig. 9 FIG. 4 is an enlarged view of the sensor unit 40 in a cross section along the rotation axis of the motor according to the exemplary embodiment. Fig.10 Yes Fig. 9 A further enlarged image.

[0121] like Fig. 9 As shown, the connection portion 26 has a first partition 231a and a second partition 231b. The first partition 231a extends from the first cover 23a to the other axial side Z2 and is located between the yoke 21 and the stator core 121. The second partition 231b extends from the second cover 23b to the one axial side 1 and is located between the yoke 21 and the stator core 121. The outer side surfaces of the first partition 231a and the second partition 231b in the radial direction R are in contact with the yoke 21, so that the connection portion 26 is engaged with the yoke 21. The magnet 22 is located between the first partition 231a and the second partition 231b in the axial direction.

[0122] In this embodiment, the outer shape of the spacer 43 in the radial direction R is along the shape of the first cover 23a. Fig.10 As shown, a position R2 of an end portion of the spacer 43 on the stator 10 side is located outside in the radial direction R relative to a position R1 of an end portion of the spacer 43 on the first cover 23 a side.

[0123] Since the first cover 23a is bent toward the first partition 231a, the end of the spacer 43 on the axial side Z1 and the circuit substrate 42 are close to the first cover 23a. Therefore, there is a possibility that these components interfere with each other during manufacturing due to the error in the size of the components. By positioning the end of the spacer 43 on the axial side Z1 inside the radial direction R, the end of the spacer 43 on the axial side Z1 can be separated from the first cover 23a. In addition, since the circuit substrate 42 is arranged at the end of the spacer 43 on the axial side Z1, the circuit substrate 42 is also separated from the first cover 23a. Therefore, the spacer 43 and the circuit substrate 42 are prevented from contacting the first cover 23a. On the other hand, the end of the spacer 43 on the other axial side Z2 is positioned further outside the radial direction R, so the space for winding the coil 123 on the radial side R inside the stator core 121 can be set wider. As a result, more coils 123 can be wound, and the motor output can be increased.

[0124] Next, refer to Fig.10 and Fig.11 , the shape of the spacer 43 is described in detail. Fig.11 is an exploded view showing the sensor unit 40 .

[0125] like Fig.10 and Fig.11As shown, the spacer 43 has a substrate support portion 433 in addition to the base portion 431. The substrate support portion 433 is in contact with the mounting surface S1 of the circuit substrate 42 to support the circuit substrate 42. The substrate support portion 433 is connected to the base portion 431 and is arranged on the axial side Z1 relative to the base portion 431. In this embodiment, the base portion 431 and the substrate support portion 433 are integrally formed by a single member. However, it is also possible that the base portion 431 and the substrate support portion 433 are separate components fixed. The base portion 431 has: a hole portion 431h that penetrates the base portion 431 along the axial direction Z; and a wall portion 432 that extends from the outer side of the radial direction R in the hole portion 431h to the axial side Z1. The spacer 43 is provided with hole portions 431h and wall portions 432 corresponding to the number of sensors 41 arranged in the sensor unit 40. The substrate support portion 433 is arranged adjacent to the hole portion 431h in the circumferential direction C.

[0126] like Fig.10 As shown, the wall portion 432 is located at a position outside the edge of the hole portion 431h. In the present embodiment, the wall portion 432 is located outside the radial direction R of the hole portion 431h, and therefore, the wall portion 432 is located at a position outside the radial direction R than the position R3 of the edge outside the radial direction R of the hole portion 431h. As a result, for example, in a case where the outer side of the radial direction R of the substrate support portion 433 is in a shape that curves toward the inner side of the radial direction R as it approaches the axial side Z1, a notch 434 is provided at a position corresponding to the wall portion 432 at the end portion of the axial side Z1 of the spacer 43. That is, the hole portion 431h is not shielded in the axial direction Z by the wall portion 432. Therefore, the hole portion 431h can be easily formed in the spacer 43 formed by molding the resin.

[0127] In this embodiment, the sensor body 41B of the sensor 41 is located in the hole 431h of the spacer 43. The wall portion 432 is located outside the radial direction R of the wire portion 41L. In other words, the wall portion 432 covers the outside of the radial direction R of the wire portion 41L. Fig.10 As shown, the lead portion 41L extends toward one axial side Z1 while bending from the sensor body 41B toward the inner side in the radial direction R. The end of the lead portion 41L on the opposite side from the sensor body 41B is attached to the circuit board 42. Therefore, the end of the lead portion 41L on the circuit board 42 side is located farther from the wall portion 432 than the end on the sensor body 41B side.

[0128] Through the shape of the above-mentioned sensor 41, in the spacer 43 whose shape is bent toward the inner side of the radial R as it approaches the axial side Z1 on the outer side of the radial R of the substrate support portion 433, the sensor body 41B can be arranged at the outer side of the radial R of the stator core 121, and the space for winding the coil 123 toward the inner side of the radial R of the stator core 121 can be set wider, thereby making the motor output higher.

[0129] The embodiments of the present disclosure are described above with reference to the accompanying drawings. However, the present disclosure is not limited to the above embodiments and can be implemented in various ways without departing from the main purpose thereof. In addition, the multiple structural elements disclosed in the above embodiments can be appropriately changed. For example, a structural element of all the structural elements shown in a certain embodiment can be added to the structural elements of another embodiment, or some structural elements of all the structural elements shown in a certain embodiment can be deleted from the embodiment.

[0130] In addition, in order to facilitate the understanding of the disclosed content, the drawings schematically show the main body of each structural element, and for the convenience of drawing, the thickness, length, number, spacing, etc. of each structural element shown in the drawings are sometimes different from the actual ones. In addition, the structure of each structural element shown in the above-mentioned embodiment is an example and is not particularly limited. It is self-evident that various changes can be made within the scope that does not substantially deviate from the effect of the present disclosure.

[0131] In addition, the present technology can adopt the following structures.

[0132] (1) A stator having: a stator core having an annular core back surrounding a central axis in a circumferential direction and a plurality of teeth extending radially from the core back and arranged in a circumferential direction;

[0133] an insulator covering at least a portion of the stator core;

[0134] a coil, the coil being mounted on the tooth via the insulator;

[0135] a circuit substrate on which electronic components are mounted and arranged on one axial side of the stator core; and

[0136] a spacer, wherein the spacer is arranged between the circuit substrate and the stator core in the axial direction,

[0137] The circuit substrate is connected to the spacer.

[0138] The electronic component is arranged on a mounting surface of the circuit board that faces the spacer.

[0139] (2) In the stator of (1), the electronic component has a component body and a lead portion extending from the component body,

[0140] A portion of the lead portion on the component body side is arranged along the mounting surface.

[0141] (3) In the stator of (2), the component body is located at a position exposed from the circuit board when viewed from a direction opposite to the mounting surface.

[0142] (4) In the stator of (3), the component body is covered with a resin material.

[0143] (5) A motor having: a stator according to any one of (1) to (4); and

[0144] The rotor is opposed to the stator in a radial direction and rotates around the stator.

[0145] (6) a stator having: a stator core having an annular core back surrounding a central axis in a circumferential direction and a plurality of teeth extending radially from the core back and arranged in a circumferential direction;

[0146] an insulator covering at least a portion of the stator core;

[0147] a coil, the coil being mounted on the tooth via the insulator;

[0148] a stator holder, the stator holder holding one axial side of the core back via the insulator;

[0149] an insulating plate, the insulating plate covering one axial side of the stator holder;

[0150] a circuit substrate on which electronic components are mounted and arranged on one axial side of the stator core; and

[0151] a spacer, wherein the spacer is arranged between the circuit substrate and the stator core in the axial direction,

[0152] The circuit substrate is connected to the spacer.

[0153] The insulating plate has:

[0154] a supporting portion, the supporting portion being in contact with a mounting surface of the circuit substrate that faces the spacer side and supporting the circuit substrate; and

[0155] a groove portion, the groove portion being recessed relative to the support portion,

[0156] A portion of a jumper wire connected to the coil is disposed in the groove portion.

[0157] (7) In the stator of (6), the circuit substrate has an opening,

[0158] A portion of the jumper wire is located in the opening.

[0159] (8) A motor having: a stator according to (6) or (7); and

[0160] The rotor is opposed to the stator in a radial direction and rotates around the stator.

[0161] (9) A motor having: a shaft extending in an axial direction along a central axis;

[0162] a stator fixed to the shaft; and

[0163] a rotor that rotates around the stator,

[0164] The stator has:

[0165] A stator core having an annular core back surrounding a central axis in a circumferential direction and a plurality of teeth extending radially from the core back and arranged in a circumferential direction;

[0166] an insulator covering at least a portion of the stator core;

[0167] a coil, the coil being mounted on the tooth via the insulator;

[0168] a stator holder that holds the stator and the shaft;

[0169] a circuit substrate on which electronic components are mounted and arranged on one axial side of the stator core; and

[0170] a spacer, wherein the spacer is arranged between the circuit substrate and the stator core in the axial direction,

[0171] The circuit substrate is connected to the spacer.

[0172] The rotor has:

[0173] an annular rim, the rim surrounding the radial outer circumference of the stator;

[0174] an annular yoke connected to the rim and arranged radially inward of the rim;

[0175] a magnet, the magnet being arranged radially inward of the yoke and opposite to the stator;

[0176] a connecting portion connected to the rim or the yoke; and

[0177] a bearing that supports the connection portion so as to be rotatable relative to the shaft,

[0178] The connecting portion has:

[0179] a cover covering a side of the stator on which the circuit substrate is disposed; and

[0180] a partition portion extending axially from the cover and located between the yoke portion and the stator,

[0181] The spacer is located between the cover and the stator,

[0182] An end portion of the spacer on the stator side is located radially outward of an end portion of the spacer on the cover side.

[0183] (10) In the motor of (9), the spacer has:

[0184] a substrate supporting portion that supports the circuit substrate; and

[0185] a storage portion for storing the electronic components,

[0186] The storage portion has:

[0187] a hole; and

[0188] a wall portion extending from a portion of an edge of the hole portion,

[0189] The wall portion is located outside the edge of the hole portion.

[0190] (11) In the motor of (10), the electronic component has a component body and a lead portion extending from the component body,

[0191] The component body is located in the hole portion,

[0192] The conductor portion is bent,

[0193] An end portion of the lead portion on the circuit substrate side is located farther from the wall portion than an end portion of the lead portion on the component body side.

[0194] Industrial Applicability

[0195] The present disclosure can be applied to the fields of stators and motors.

Claims

1. A stator, characterized in that: have: A stator core having an annular core back surrounding a central axis in a circumferential direction and a plurality of teeth extending radially from the core back and arranged in a circumferential direction; an insulator covering at least a portion of the stator core; a coil, the coil being mounted on the tooth via the insulator; a circuit substrate on which electronic components are mounted and arranged on one axial side of the stator core; as well as a spacer, wherein the spacer is arranged between the circuit substrate and the stator core in the axial direction, The circuit substrate is connected to the spacer. The electronic component is arranged on a mounting surface of the circuit board that faces the spacer.

2. The stator according to claim 1, characterized in that: The electronic component includes a component body and a lead portion extending from the component body. A portion of the lead portion on the component body side is arranged along the mounting surface.

3. The stator according to claim 2, characterized in that: The component body is located at a position exposed from the circuit board when viewed from a direction opposite to the mounting surface.

4. The stator according to claim 3, characterized in that: The component body is covered with a resin material.

5. A motor, characterized in that: have: The stator according to any one of claims 1 to 4; and The rotor is opposed to the stator in a radial direction and rotates around the stator.

6. A stator, characterized in that: have: A stator core having an annular core back surrounding a central axis in a circumferential direction and a plurality of teeth extending radially from the core back and arranged in a circumferential direction; an insulator covering at least a portion of the stator core; a coil, the coil being mounted on the tooth via the insulator; a stator holder, the stator holder holding one axial side of the core back via the insulator; an insulating plate, the insulating plate covering one axial side of the stator holder; a circuit substrate on which electronic components are mounted and arranged on one axial side of the stator core; and a spacer, wherein the spacer is arranged between the circuit substrate and the stator core in the axial direction, The circuit substrate is connected to the spacer. The insulating plate has: a supporting portion, the supporting portion being in contact with a mounting surface of the circuit substrate that faces the spacer side and supporting the circuit substrate; and a groove portion, the groove portion being recessed relative to the support portion, A portion of a jumper wire connected to the coil is disposed in the groove portion.

7. The stator according to claim 6, characterized in that The circuit substrate has an opening, A portion of the jumper wire is located in the opening.

8. A motor, characterized in that: have: The stator according to claim 6 or 7; and The rotor is opposed to the stator in a radial direction and rotates around the stator.

9. A motor, characterized in that: have: a shaft extending axially along a central axis; a stator fixed to the shaft; and a rotor that rotates around the stator, The stator has: A stator core having an annular core back surrounding a central axis in a circumferential direction and a plurality of teeth extending radially from the core back and arranged in a circumferential direction; an insulator covering at least a portion of the stator core; a coil, the coil being mounted on the tooth via the insulator; a stator holder that holds the stator and the shaft; a circuit substrate on which electronic components are mounted and arranged on one axial side of the stator core; as well as a spacer, wherein the spacer is arranged between the circuit substrate and the stator core in the axial direction, The circuit substrate is connected to the spacer. The rotor has: an annular rim, the rim surrounding the radial outer circumference of the stator; an annular yoke connected to the rim and arranged radially inward of the rim; a magnet, the magnet being arranged radially inward of the yoke and opposite to the stator; a connecting portion connected to the rim or the yoke; and a bearing that supports the connection portion so as to be rotatable relative to the shaft, The connecting portion has: a cover covering a side of the stator on which the circuit substrate is disposed; and a partition portion extending axially from the cover and located between the yoke portion and the stator, The spacer is located between the cover and the stator, An end portion of the spacer on the stator side is located radially outward of an end portion of the spacer on the cover side.

10. The motor according to claim 9, characterized in that The spacer has: a substrate supporting portion that supports the circuit substrate; and a storage portion for storing the electronic components, The storage portion has: Hole; as well as a wall portion extending from a portion of an edge of the hole portion, The wall portion is located outside the edge of the hole portion.

11. The motor according to claim 10, characterized in that The electronic component includes a component body and a lead portion extending from the component body. The component body is located in the hole portion, The conductor portion is bent, An end portion of the lead portion on the circuit substrate side is located farther from the wall portion than an end portion of the lead portion on the component body side.

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