motor

Abstract

To prevent a surface of a substrate from being covered by resin.SOLUTION: A motor includes a stator, a substrate provided on the stator with wiring, and a resin member covering the stator. In a direction of a rotary shaft, the substrate includes a first surface facing the stator, and a second surface. The first surface of the substrate is in contact with the resin member. The second surface of the substrate includes an inner peripheral portion and an intermediate portion between the inner peripheral portion and an outer edge portion of the substrate. A recess extending in a radial direction is formed on the intermediate portion of the second surface of the substrate. An end portion of an inner peripheral side of the recess is on the outer edge portion in the radial direction with respect to the inner peripheral portion of the second surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] In a motor, a technique is known in which a wiring board is fixed to a stator by soldering, and then the stator is covered with resin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 039204 [Patent Document 2] Japanese Patent Application Publication No. 06-178514 Summary of the Invention [Problem to be solved by the invention]

[0004] When the stator is covered with resin, the resin may cover the surface of the substrate.

[0005] In one aspect, an object is to provide a motor that can prevent the surface of the substrate from being covered with resin. [Means for solving the problem]

[0006] In one embodiment, the motor includes a stator, a substrate having wiring provided on the stator, and a resin member covering the stator. In the direction of the rotation axis, the substrate has a first surface facing the stator and a second surface. The first surface of the substrate is in contact with the resin member. The second surface of the substrate has: Circular The inner circumference and the Circular an intermediate portion between the inner periphery and the outer edge of the substrate; and an annular outer periphery; A recess extending in the radial direction is formed in an intermediate portion of the second surface of the substrate, and an end portion on the inner periphery side of the recess is located on the outer edge portion side in the radial direction relative to the inner periphery of the second surface. The outer peripheral end of the recess is located radially closer to the inner edge of the substrate than the outer peripheral portion of the second surface, and the annular inner peripheral portion and the annular outer peripheral portion protrude axially relative to the intermediate portion.

[0007] According to one aspect, it is possible to prevent the surface of the substrate from being covered with resin. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an example of a motor according to an embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of a stator before being covered with resin in the embodiment. [Figure 3] FIG. 3 is an exploded perspective view showing an example of a stator before being covered with resin in the embodiment. [Figure 4] FIG. 4 is a top view showing an example of a substrate in the embodiment. [Figure 5] FIG. 5 is a side cross-sectional view showing an example of a molded stator according to an embodiment. [Figure 6] FIG. 6 is another cross-sectional side view showing an example of a molded stator in an embodiment. [Figure 7] FIG. 7 is an enlarged cross-sectional perspective view showing an example of a molded stator in an embodiment. [Figure 8] FIG. 8 is another enlarged cross-sectional perspective view showing an example of a molded stator in an embodiment. [Figure 9] FIG. 9 is another enlarged perspective cross-sectional view showing an example of a molded stator in an embodiment. [Figure 10] FIG. 10 is a top view showing an example of a substrate in the first modified example. [Figure 11] FIG. 11 is a top view showing an example of a substrate in the second modified example. [Figure 12] FIG. 12 is an enlarged perspective cross-sectional view showing an example of a molded stator in the second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of a motor disclosed in the present application will be described in detail with reference to the drawings. Note that the dimensional relationships and ratios of elements in the drawings may differ from reality. The dimensional relationships and ratios may also differ between the drawings. For ease of understanding, each drawing may illustrate a coordinate system whose axial direction is the direction in which a shaft 99 (described later) extends.

[0010] [Embodiment] First, the motor of this embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing an example of a motor of this embodiment. FIG. 2 is a view showing an example of a stator before being covered with resin in this embodiment. FIG. 3 is an exploded perspective view showing an example of a stator before being covered with resin in this embodiment. As shown in FIGS. 1 to 3, the motor 1 of this embodiment includes a molded stator 4, a rotor 80, and a shaft 99. In this embodiment, the motor 1 is, for example, a frameless motor. In the following, the stator before being covered with a resin member 60 described later may be referred to as a stator 2, and the stator covered with the resin member 60 may be referred to as a molded stator 4.

[0011] The molded stator 4 shown in Fig. 1 is formed by covering the stator 2, to which the substrate 50 shown in Fig. 4 is fixed, with a resin member 60, as shown in Fig. 2. Fig. 4 is a top view showing an example of the substrate in the embodiment. As shown in Figs. 2 and 3, the substrate 50 is fixed to the stator 2 from the first direction side in the axial direction. At this time, terminals 31 and 32 of the coil 30, which will be described later, are fixed to lands 54, which will be described later, with solder S, thereby electrically connecting the coil 30 and the substrate 50.

[0012] The rotor 80 is disposed radially inside the molded stator 4. As shown in FIG. 1, the rotor 80 includes a magnet 81 and a rotor core 82. The magnet 81 is, for example, a cylindrical magnet fixed to the outer peripheral surface of the rotor core 82. The magnet 81 is, for example, formed of a rare earth magnet such as a neodymium magnet. The magnet 81 may also be a bonded magnet or a sintered magnet. The magnet 81 is not limited to a cylindrical magnet, and may also be a cylindrical magnet or a polygonal magnet. The magnet 81 may not only be fixed to the outer peripheral surface, but may also be embedded in the rotor core 82.

[0013] The shaft 99 is fixed to, for example, the inner circumferential surface of the rotor 80, and transmits the driving force to an external device. Note that the shaft 99 may be omitted from illustration in the figures from FIG.

[0014] As shown in FIGS. 2 and 3 , the stator 2 includes a stator core 10, an insulator 20, and a coil 30. In the embodiment, the stator 2 is arranged to surround the rotor 80. The stator core 10 constituting the stator 2 is arranged, for example, in an annular shape along the circumferential direction. The stator core 10 is formed by stacking a plurality of plate-shaped metal members, such as silicon steel plates and soft magnetic steel plates such as electromagnetic steel plates, in the axial direction. The stator core 10 includes an inner peripheral portion 11 facing the rotor 80, and an outer peripheral portion 12.

[0015] The insulator 20 is made of an insulating material such as resin, etc. The insulator 20 covers the stator core 10 from a first direction side and a second direction side in the axial direction.

[0016] 2 and 3, the insulator 20 includes an inner peripheral portion 21 and an outer peripheral portion 22. The outer peripheral portion 22 includes two recesses 24 and 25 cut out in a second axial direction.

[0017] As shown in Fig. 3, the coil 30 is formed by winding a conductor around the stator 2 via the insulator 20. As shown in Fig. 3, a first end 31 and a second end 32 of the conductor are drawn out from the coil 30 in the same direction (first direction) as lead wires.

[0018] In the embodiment, the stator 2 is formed by arranging the stator core 10, around which the coil 30 is wound with the insulator 20 interposed therebetween, in a circular shape.

[0019] In the embodiment, the substrate 50 is a wiring substrate having wiring formed by alternately stacking insulating layers made of an insulating resin material such as epoxy and conductive layers made of metal or the like in the axial direction. As shown in FIG. 3, the substrate 50 has a surface 5a on a second axial direction side and a surface 5b on a first axial direction side. For example, as shown in FIG. 3, the substrate 50 is directly supported by the stator 2 so that the surface 5a faces the stator 2 in the axial direction. More specifically, the substrate 50 is supported at both ends in the radial direction by the inner peripheral portion 21 and the outer peripheral portion 22 of the insulator 20.

[0020] In the embodiment, surfaces 5a and 5b are formed of an insulator. Furthermore, a resist portion is formed on surface 5b. A plurality of conductors and a plurality of insulators are stacked and disposed between surfaces 5a and 5b in the axial direction. That is, substrate 50 is formed by stacking a plurality of conductors and a plurality of insulators in the axial direction. Surface 5a is an example of a first surface, and surface 5b is an example of a second surface.

[0021] 3 and 4, lands 54 are formed on the substrate 50. The lands 54 are made of a conductive material and are connection portions that are connected to the first end 31 and the second end 32 of the conducting wire drawn out from the coil 30.

[0022] As shown in Fig. 4, an inner peripheral portion 51 and an outer peripheral portion 52 are formed on the surface 5b of the substrate 50. As shown in Fig. 4, the inner peripheral end of the inner peripheral portion 51 is located outer than the inner edge portion 58, and the outer peripheral end of the outer peripheral portion 52 is located inner than the outer edge portion 53. In other words, the inner peripheral portion 51 does not form part of the inner edge portion 58, and the outer peripheral portion 52 does not form part of the outer edge portion 53.

[0023] Additionally, an intermediate portion 55 is formed between the inner peripheral portion 51 and the outer peripheral portion 52 in the radial direction. A logo, letter, symbol, or the like (not shown) is formed in the intermediate portion 55 using a film (silk) formed in a certain area on the substrate by screen printing using, for example, non-conductive ink. Note that the intermediate portion 55 may only have a non-silk-free region.

[0024] Pads 59 are arranged in an intermediate portion 55 of the surface 5b as external connection portions for connection to an external device. In this embodiment, the pads 59 include three pads 59A, 59B, and 59C corresponding to the three phases. Electronic components (not shown) are connected to the pads 59A to 59C.

[0025] Furthermore, a plurality of radial recesses 57a, 57b, 57c, and 57d extending in the radial direction are formed in the intermediate portion 55. Note that, hereinafter, when the plurality of radial recesses are not to be distinguished from one another, they will be simply referred to as radial recesses 57. Furthermore, the radial recesses 57 are an example of recesses extending in the radial direction.

[0026] The radial recesses 57 are formed between the pads 59 in the circumferential direction. For example, the radial recess 57b is formed between the pad 59A and the pad 59B. In this case, the four radial recesses 57 insulate the three pads 59A, 59B, and 59C from each other.

[0027] 4, the inner peripheral portion 51 is formed in an annular shape radially outward from an inner edge portion 58 of the substrate 50. An annular recess 56 is formed radially outward from the inner peripheral portion 51, the recess 56 being cut out axially downward (toward the second direction). The outer peripheral portion 52 is formed in an annular shape radially inward from an outer edge portion 53 of the substrate 50. The intermediate portion 55 contacts the annular recess 56 on the radially inner side and contacts the outer peripheral portion 52 on the radially outer side.

[0028] As will be described later, the size (thickness) of the inner peripheral portion 51 in the axial direction is approximately the same as the thickness of the intermediate portion 55, and the size (thickness) of the outer peripheral portion 52 in the axial direction is greater than the thickness of the intermediate portion 55. In addition, as will be described later, the depth (size in the axial direction) of the annular recess 56 is approximately the same as the depth of the radial recesses 57.

[0029] The inner circumferential portion 51 forms an annular wall portion radially inward relative to the radial recesses 57. In other words, the inner circumferential portion 51 contacts the radially inner end of the radial recesses 57, the axial size of the inner circumferential portion 51 is larger than the axial size of the radial recesses 57, and the inner circumferential portion 51 protrudes in the axial direction compared to the radial recesses 57. The radial recesses 57 are formed radially inward relative to the outer circumferential portion 52. In this case, the radial length of the radial recesses 57 is smaller than the width (radial length) of the substrate 50. The radial recesses 57 and the inner edge portion 58 of the substrate 50 face each other via the inner circumferential portion 51, which is a portion protruding in a first axial direction.

[0030] The resin member 60 is formed, for example, by filling a mold with liquid resin while the stator 2 with the substrate 50 attached is placed therein, and then allowing the resin to harden. The resin member 60 may be a thermosetting resin or a thermoplastic resin. In the embodiment, the resin forming the resin member 60 contains, for example, aluminum or silicon. In this case, the rigidity of the resin forming the insulator 20 is greater than the rigidity of the resin forming the resin member 60, for example.

[0031] 1, for example, a radially inner portion of the inner circumferential portion 51 is covered in the axial direction by the inner circumferential portion 61 of the resin member 60. Similarly, for example, a radially outer portion of the outer circumferential portion 52 is covered in the axial direction by the outer circumferential portion 62 of the resin member 60. That is, in the molded stator 4 shown in FIG. 1, the inner circumferential portion 51 and the outer circumferential portion 52 of the stator 2 shown in FIG. 2 are partially covered by the resin member 60 and are not visible. In other words, a portion of the inner circumferential portion 51 is disposed between the resin members 60 in the axial direction. Similarly, a portion of the outer circumferential portion 52 is disposed between the resin members 60 in the axial direction.

[0032] Fig. 5 is a side cross-sectional view showing an example of a molded stator according to an embodiment. Fig. 6 is another side cross-sectional view showing an example of a molded stator according to an embodiment. Fig. 5 shows a cross-section cut along plane P1 in Fig. 1, and Fig. 6 shows a cross-section cut along plane P2 in Fig. 1, i.e., a plane passing through radial recesses 57c. As shown in Figs. 5 and 6, in the molded stator 4, the stator core 10 is covered with a resin member 60 except for the inner peripheral portion 11 and the outer peripheral portion 12. The insulator 20 is also entirely covered with the resin member 60.

[0033] Furthermore, the surface 5a of the substrate 50 faces the stator 2 in the axial direction and contacts the support portion 65 of the resin member 60. In the embodiment, the surface 5a of the substrate 50 is supported on both radial sides from the second axial direction side by, for example, the inner peripheral portion 21 and the outer peripheral portion 22 of the insulator 20.

[0034] In the molded stator 4 shown in Figures 5 and 6, as described above, a portion of the inner peripheral portion 51 of the surface 5b of the substrate 50 is covered by the inner peripheral portion 61 of the resin member 60, and a portion of the outer peripheral portion 52 is covered by the outer peripheral portion 62 of the resin member 60.

[0035] Fig. 7 is an enlarged cross-sectional perspective view showing an example of a molded stator in an embodiment. Fig. 8 is another enlarged cross-sectional perspective view showing an example of a molded stator in an embodiment. Fig. 9 is another enlarged cross-sectional perspective view showing an example of a molded stator in an embodiment. Fig. 7 is an enlarged view of a portion indicated by frame F1 in Fig. 5, Fig. 8 is an enlarged view of a portion indicated by frame F2 in Fig. 5, and Fig. 9 is an enlarged view of a portion indicated by frame F3 in Fig. 6. In the following figures, a straight line L1 indicates the size (thickness) of the intermediate portion 55 in the axial direction.

[0036] 7, the inner peripheral portion 51 and the intermediate portion 55 have approximately the same size (thickness) in the axial direction. On the other hand, as shown in FIG. 9, the outer peripheral portion 52 has a larger size (thickness) in the axial direction than the inner peripheral portion 51 and the intermediate portion 55.

[0037] 7, in the radial direction, an area A1 surrounded by an inner end S1 of the inner circumferential portion 21 and an outer end M1 of the inner circumferential portion 61 of the resin member 60 is covered by the inner circumferential portion 61 of the resin member 60. Similarly, as shown in FIG. 8, in the radial direction, an area A2 surrounded by an outer end S2 of the outer circumferential portion 22 and an inner end M2 of the outer circumferential portion 62 of the resin member 60 is covered by the outer circumferential portion 62 of the resin member 60.

[0038] 9 , in a range A3 surrounded in the radial direction by an outer end M1 of the inner circumferential portion 61 of the resin member 60 and an outer end M2 of the outer circumferential portion 62 of the resin member 60, the surface 5b of the substrate 50 is exposed toward the positive axial direction without being covered by the resin member 60. That is, in the embodiment, a part of the outer circumferential side of the inner circumferential portion 51 of the substrate 50, a part of the inner circumferential side of the outer circumferential portion 52, and an intermediate portion 55 are not covered by the resin member 60.

[0039] In this configuration, even if the inner peripheral portion 61 of the resin member 60 leaks outward, the resin member 60 is prevented from leaking along the radial recesses 57c to the intermediate portion 55. Similarly, the resin member 60 is prevented from leaking from the outer peripheral portion 62 of the resin member 60 to the intermediate portion 55.

[0040] As described above, the motor 1 in this embodiment includes the stator 2, a substrate 50 having wiring provided on the stator 2, and a resin member 60 covering the stator 2. In the direction of the rotation axis, the substrate 50 includes a first surface 5a facing the stator 2 and a second surface 5b. The first surface 5a of the substrate 50 is in contact with the resin member 65. The second surface 5b of the substrate 50 includes an inner periphery 51 and an intermediate portion 55 located between the inner periphery 51 and the outer edge 53 of the substrate 50. A recess 57 extending in the radial direction is formed in the intermediate portion 55 of the second surface 5b of the substrate 50, and the inner edge of the recess 57 is located closer to the outer edge 53 in the radial direction than the inner periphery 51 of the second surface 5b. This configuration prevents the surface of the substrate from being covered with resin.

[0041] [Variations] Although the configuration of this embodiment has been described above, the embodiment is not limited to this. For example, the substrate 50 may be configured to be cantilevered on only one of the inner peripheral portion 21 and the outer peripheral portion 22 of the insulator 20.

[0042] Also, a configuration may be adopted in which no portion protruding in the positive axial direction is formed on the outer periphery of the substrate covered with resin member 60. Fig. 10 is a top view showing an example of a substrate in a first modified example. Note that in the following modified examples, the same parts as those shown in the previously described drawings are given the same reference numerals, and duplicated explanations will be omitted.

[0043] As shown in Fig. 10, the substrate 70 in the first modified example does not have the outer peripheral portion 52 as shown in Fig. 4. In this case, no step is formed in the axial direction between the portion corresponding to the outer peripheral portion 52 in the embodiment and the intermediate portion 55. Also, as shown in Fig. 13, the intermediate portion 55 contacts the outer edge portion 53 without the outer peripheral portion 52 therebetween.

[0044] In the first modified example, the radial recesses 77 extend from the inner periphery 51 to the outer edge 53. In this case as well, the radial length of the radial recesses 77 is smaller than the radial length of the substrate 70.

[0045] Furthermore, inner peripheral portion 51 of substrate 70 in the first modified example and a position of substrate 70 corresponding to outer peripheral portion 52 shown in Fig. 4 may be covered with silk or the like as shown in Fig. 11. Fig. 11 is a top view showing an example of a substrate in the second modified example. Fig. 12 is an enlarged cross-sectional perspective view showing an example of a molded stator in the second modified example.

[0046] Figure 12 As shown in FIG. 10, in the substrate 90 of the second modification, silk 91 is provided on the axially positive side of the inner peripheral portion 51 shown in FIG. 10, and at a position corresponding to the outer peripheral portion 52 shown in FIG. As shown in Figure 11 The silk 91 is provided with a silk thread 92. The silk thread 91 is an example of an annular member, and the silk thread 92 is an example of a second annular member.

[0047] In the second modified example, the thickness of the silk 91 and 92 is approximately the same as the thickness of the logo, letters, or symbols formed in the intermediate portion 55, for example, and is equal to or smaller than the size of the resin filler. The thickness of the silk 91 and 92 is, for example, about 20 μm. In this case, as shown in FIG. 12 , the inner circumferential portion 51 covered with the silk 91 has the same or substantially the same height as the intermediate portion 55, or the inner circumferential portion 51 protrudes more than the intermediate portion 55. The same applies to the portion covered with the silk 92 that corresponds to the outer circumferential portion 52. Note that a configuration may also be adopted in which no logo, letters, or symbols are formed in the intermediate portion 55, and the positions corresponding to the inner circumferential portion 51 and the outer circumferential portion 52 protrude more in the axial direction than the intermediate portion 55.

[0048] This prevents a gap from forming between the mold and the resist portion on the second surface 5b of the substrate 50, thereby more reliably preventing resin leakage. Alternatively, one of the inner peripheral portion 51 and the outer peripheral portion 52 may be configured to protrude more in the axial direction than the other, for example, by providing silk on only one of the inner peripheral portion 51 and the outer peripheral portion 52. The configuration of the annular member and the second annular member is not limited to silk printing; other structures may be used, such as annular resin members, as long as they have a size (thickness) in the axial direction. Furthermore, the silk 92 may be further formed on the outer peripheral portion 52 protruding from the substrate 50 shown in FIG. 4 toward the positive axial direction. In this case, the portion corresponding to the outer peripheral portion 52 will have a larger size (thickness) in the axial direction than the silk 92 shown in FIG. 11.

[0049] Furthermore, although the configuration in which the stator core 10 is exposed and not covered by the resin member 60 has been described, the resin member 60 may be configured to cover the stator core 10 in addition to the insulator 20, as long as the heat dissipation effect and the roundness of the stator 2 can be ensured.

[0050] The rotor or stator described in the embodiment and each modified example of the present invention may be mounted on an actuator, electronic device, etc. Specifically, the rotor or stator described in the embodiment and each modified example of the present invention may be housed in a frame, housing, body, etc. of an actuator or electronic device, and used as a driving element for the actuator or electronic device.

[0051] While the present invention has been described above based on the embodiments and modifications, it goes without saying that the present invention is not limited to the embodiments and modifications, and various modifications are possible without departing from the spirit of the present invention. Such modifications without departing from the spirit of the present invention are also included in the technical scope of the present invention, and this will be clear to those skilled in the art from the description of the claims.

[0052] As explained in detail in the embodiments, the detailed description of the invention also describes inventions relating to motors, which are described below.

[0053] [Appendix 1] a stator; a substrate provided on the stator and having wiring; a resin member covering the stator; Equipped with the substrate has a first surface facing the stator and a second surface in a direction of the rotation axis; a first surface of the substrate in contact with the resin member; the second surface of the substrate comprises an inner periphery and an intermediate portion between the inner periphery and an outer edge of the substrate; a recess extending in a radial direction is formed in an intermediate portion of the second surface of the substrate; an end portion on an inner circumferential side of the recess is located on the outer edge portion side in the radial direction relative to the inner circumferential portion of the second surface; Motor.

[0054] [Appendix 2] The motor of claim 1, wherein the inner periphery of the second surface of the substrate is an annular wall portion for the recess.

[0055] [Appendix 3] The motor according to claim 1 or 2, wherein an annular member is provided on an inner periphery of the second surface of the substrate in the direction of the rotation axis.

[0056] [Appendix 4] the substrate further comprises an outer periphery between the intermediate portion and the outer edge portion; 4. The motor according to claim 1, wherein a second annular member is provided on the outer circumferential portion in the direction of the rotation axis.

[0057] [Appendix 5] 5. The motor according to claim 1, wherein a middle portion of the second surface of the substrate is exposed to the resin member.

[0058] [Appendix 6] 6. The motor of any one of claims 1 to 5, wherein the substrate comprises a plurality of stacked conductors and a plurality of insulators.

[0059] [Appendix 7] 7. The motor according to claim 1, wherein an inner periphery of the second surface of the substrate is covered with the resin member.

[0060] [Appendix 8] 5. The motor according to claim 4, wherein an outer periphery of the second surface of the substrate is covered with the resin member.

[0061] [Appendix 9] 7. The motor according to claim 1, wherein a part of an inner circumferential side of the inner circumferential portion is covered with the resin member.

[0062] [Appendix 10] 5. The motor according to claim 4, wherein a portion of the outer circumferential side of the outer circumferential portion is covered with the resin member.

[0063] [Appendix 11] 10. The motor according to claim 9, wherein a portion of the outer circumferential side of the inner circumferential portion is exposed to the resin member.

[0064] [Appendix 12] 11. The motor according to claim 10, wherein a portion of an inner circumferential side of the outer circumferential portion is exposed to the resin member.

[0065] [Appendix 13] 13. The motor according to any one of claims 1 to 12, wherein the radial length of the recess is smaller than the radial width of the substrate.

[0066] [Appendix 14] 14. The motor according to any one of claims 1 to 13, wherein an axially protruding portion is formed between a radial end of the recess and an inner edge of the substrate.

[0067] [Appendix 15] 15. The motor according to claim 1, wherein an inner peripheral end of the recess and the resin member face each other in the radial direction, with the inner peripheral portion interposed therebetween.

[0068] [Appendix 16] the substrate further comprises an outer periphery between the intermediate portion and the outer edge portion; an end portion on an inner periphery side of the inner periphery portion is located closer to the outer periphery portion than an end portion on an inner periphery side of the substrate, an outer peripheral end of the outer peripheral portion is located closer to the inner peripheral portion than an outer peripheral end of the substrate; 16. The motor according to any one of claims 1 to 15. [Explanation of symbols]

[0069] 1 motor, 2 stator, 4 molded stator, 10 stator core, 11 inner periphery, 12 outer periphery, 20 insulator, 21 inner periphery, 22 outer periphery, 30 coil, 31 first end, 32 second end, 50, 70, 90 substrate, 51 inner periphery, 52 outer periphery, 53 outer edge, 54 land, 55 middle portion, 56 annular recess, 57, 77 radial recess, 58 inner edge, 59 pad, 60 resin member, 61 inner periphery, 62 outer periphery, 65 support portion, 91, 92 silk, 80 rotor, 81 magnet, 82 rotor core, 99 shaft

Claims

1. a stator; a substrate provided on the stator and having wiring; a resin member covering the stator; Equipped with the substrate has a first surface facing the stator and a second surface in a direction of the rotation axis; a first surface of the substrate in contact with the resin member; the second surface of the substrate comprises an annular inner periphery, an intermediate portion between the annular inner periphery and an outer edge of the substrate, and an annular outer periphery; a recess extending in a radial direction is formed in an intermediate portion of the second surface of the substrate; an end portion on an inner circumferential side of the recess is located on the outer edge portion side in the radial direction relative to an inner circumferential portion of the second surface, an outer peripheral end of the recess is located on the inner edge side of the substrate relative to the outer periphery of the second surface in the radial direction; The annular inner peripheral portion and the annular outer peripheral portion protrude in the axial direction relative to the intermediate portion. Motor.

2. The motor according to claim 1 , wherein an inner periphery of the second surface of the substrate is an annular wall portion for the recess.

3. The motor according to claim 1 or 2, wherein an annular member is provided on an inner periphery of the second surface of the substrate in the direction of the rotation axis.

4. A motor described in any one of claims 1 to 3, wherein a second annular member is provided on the outer periphery in the direction of the rotation axis.

5. The motor according to claim 1 , wherein the intermediate portion is exposed from the resin member.

6. The motor according to claim 1 , wherein an inner periphery of the second surface of the substrate is covered with the resin member.

7. The motor according to claim 4 , wherein the outer periphery is covered with the resin member.

8. The motor according to claim 3 , wherein a part of an inner periphery of the annular member is covered with the resin member.

9. The motor according to claim 4 , wherein a portion of an outer circumferential side of the second annular member is covered with the resin member.

10. The motor according to claim 1 , wherein a radial length of the recess is smaller than a radial width of the substrate.

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