Motor

Abstract

To provide a motor capable of achieving miniaturization.SOLUTION: The motor 1 includes a base 30, a stator 20 provided on the base 30, a rotor 10 surrounding the stator 20, and a substrate 50 having an electronic component 70 mounted on a surface on the stator 20 side in the axial direction. In the motor 1, the base 30 includes the recessed portion 34 and the second cylinder 33 surrounding the substrate 50, and the electronic component 70 is accommodated in the recessed portion 34.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] There is known a motor in which a stator and a rotor are disposed above a substrate on which various electronic components are mounted (see, for example, Patent Document 1). In the motor described in Patent Document 1, a coil land for soldering a coil terminal to the substrate is provided on the surface of the substrate facing the stator in the direction of the motor's rotation axis (hereinafter referred to as the "axial direction"). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-5588 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, with the advancement of robotics technology, there has been an increasing demand for motors that are even smaller than conventional ones.

[0005] However, in a motor such as that described in Patent Document 1, as described above, it is necessary to provide electronic components and conductive members such as solder that electrically connect the electronic components to the board on the stator side of the board, and therefore it is necessary to ensure space in the axial direction between the board and the stator to mount the electronic components, making it difficult to further reduce the size of a motor such as that described in Patent Document 1.

[0006] Therefore, one of the objects of the present invention is to provide a motor that can be made smaller. [Means for solving the problem]

[0007] (1): The motor of the present invention comprises a base, a stator mounted on the base, a rotor surrounding the stator, and a substrate having electronic components mounted on the surface facing the stator in the axial direction, the base comprising a recess and an outer tube surrounding the substrate, and the electronic components are housed in the recess.

[0008] (2): In the motor of (1), the substrate may be formed of a film.

[0009] (3): In the motor of (2), the substrate may have a first portion on which the electronic component is mounted, a second portion, and a slit formed between the first portion and the second portion, and the first portion may be housed in the recess.

[0010] (4): In any of the motors (1) to (3), the base may include an inner tube located inside the stator, a bottom portion facing the stator in the axial direction, and the outer tube surrounding the bottom portion.

[0011] (5) The motor of (4) may further include a shaft and a bearing that supports the shaft relative to the inner cylinder. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a front view showing a motor according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II shown in FIG. [Figure 3] 3 is a perspective view showing the base, the substrate, and the electronic component shown in FIG. 2. FIG. [Figure 4] FIG. 4 is an exploded perspective view showing the base and the substrate shown in FIG. [Figure 5] 5 is an enlarged view showing the vicinity of a connection portion between a first portion and a second portion of the substrate shown in FIG. 4. FIG. [Figure 6] FIG. 1 is a diagram illustrating an example of an electronic component. [Figure 7] FIG. 10 is a diagram illustrating another example of an electronic component. DETAILED DESCRIPTION OF THE INVENTION

[0013] Below, embodiments of a motor according to the present invention will be illustrated with reference to the accompanying drawings. The embodiments illustrated below are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention can be modified or improved from the following embodiments without departing from the spirit of the present invention. In addition, in the accompanying drawings, the dimensions of each component may be exaggerated or reduced, and hatching may be omitted, in order to facilitate understanding.

[0014] Fig. 1 is a front view showing a motor according to an embodiment, and Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. As shown in Figs. 1 and 2, motor 1 has a tubular shape (cylindrical in this embodiment). There are no particular limitations on the type of motor 1, but Figs. 1 and 2 show an example in which motor 1 is an outer rotor brushless DC motor.

[0015] The motor 1 mainly comprises a shaft (rotating shaft) 40, a base 30, a stator 20 provided (fixed) on the base 30, a rotor 10, a pair of bearings 41, 41, and a substrate 50. Electronic components 70 are mounted on the substrate 50.

[0016] The shaft 40 is disposed at the center of the motor 1. That is, the base 30, the stator 20, the rotor 10, the bearing 41, and the substrate 50 are disposed concentrically about the central axis C of the shaft 40. The longitudinal direction (direction of the rotation axis) of the shaft 40 (rotation axis) is the axial direction, and the direction passing through the central axis C of the shaft 40 and perpendicular to the axial direction is the radial direction. FIG. 1 is a view of the motor 1 viewed in the radial direction, and FIG. 2 is a cross-sectional view of the motor 1 along the axial direction. Hereinafter, in the radial direction, the side relatively closer to the shaft 40 may be referred to as the "inner" or "inside," and the side relatively farther from the shaft 40 may be referred to as the "outer" or "outside."

[0017] Fig. 3 is a perspective view showing the base 30, the substrate 50, and the electronic component 70. Fig. 4 is an exploded perspective view showing the base 30 and the substrate 50. As shown in Figs. 1 to 4, the base 30 includes a bottom 31, a first tube 32 (inner tube), and a second tube 33 (outer tube).

[0018] The bottom 31 of the base 30 has a ring-like shape when viewed in the axial direction, and in this embodiment, has an annular shape centered on the central axis C of the shaft 40. The bottom 31 faces the stator 20 in the axial direction. The bottom 31 includes a surface 31A on one side in the axial direction and a surface 31B on the other side in the axial direction. In the axial direction, the surface 31A on one side is on the stator 20 side, and the surface 31B on the other side is on the opposite side from the stator 20 side. Hereinafter, in the axial direction, the side relatively closer to the surface 31B on the other side will be referred to as the "bottom" or "lower side," and the side relatively farther from the surface 31B on the other side will be referred to as the "top" or "upper side."

[0019] As shown in FIGS. 2 and 4, the bottom 31 has one or more recesses 34 recessed from one surface 31A (hereinafter referred to as the "upper surface 31A") toward the other surface 31B (hereinafter referred to as the "lower surface 31B"). In this embodiment, the one or more recesses 34 include three recesses 34. The three recesses 34 are formed at approximately equal intervals (at intervals of approximately 120°) in the circumferential direction of the bottom 31. The number of recesses 34 is not limited to three. In this embodiment, the three recesses 34 have the same configuration except for their positions. Specifically, the recess 34 in this embodiment is formed in a rectangular shape when viewed from above in the axial direction, and is formed by a bottom surface 34A, an inclined surface 34B, and three side surfaces 34C, 34C, 34C.

[0020] 2 and 4, the bottom surface 34A of the recess 34 is a flat surface extending in the radial direction and has a rectangular shape when viewed from above in the axial direction. The bottom surface 34A extends in the radial direction from near the boundary between the bottom portion 31 and the second tube 33 to near the center of the bottom portion 31. In addition, the bottom surface 34A is located between the upper surface 31A and the lower surface 31B of the bottom portion 31 in the axial direction, and may be located, for example, below the center of the bottom portion 31 in the axial direction. The bottom surface 34A may be located at the center or above the center of the bottom portion 31 in the axial direction, but if the bottom surface 34A is located below the center in the axial direction, the axial distance from the upper surface 31A of the bottom portion 31 to the bottom surface 34A can be made greater.

[0021] The inclined surface 34B extends obliquely inward and upward from the inner end of the bottom surface 34A and connects to the upper surface 31A of the bottom portion 31. In the radial direction, the inner end of the inclined surface 34B, which is the connection portion with the upper surface 31A, may be located inside, at the center, or outside the center of the bottom portion 31. In this embodiment, an example is shown in which the inner end of the inclined surface 34B is located inside the center of the bottom portion 31 in the radial direction. By having the inner end of the inclined surface 34B located inside the center of the bottom portion 31 in the radial direction, the area of ​​the recess 34 can be further increased. The inclination angle θ of the inclined surface 34B with respect to the upper surface 31A is an acute angle and may be, for example, approximately 45°.

[0022] The three side surfaces 34C, 34C, 34C are connected to three of the four sides of the bottom surface 34A excluding the side that forms the connection portion with the inclined surface 34B, and extend vertically upward from the bottom surface 34A. The upper ends of the three side surfaces 34C, 34C, 34C are connected to the upper surface 31A of the bottom 31.

[0023] The shape and size of the recess 34 are not limited to those described above, as long as the recess 34 is recessed from the upper surface 31A toward the lower surface 31B of the bottom 31. Furthermore, when a plurality of recesses 34 are formed, the recesses 34 do not all need to have the same shape and size, and may have different shapes and sizes.

[0024] As shown in FIGS. 2 and 4, the first tube 32 (inner tube) of the base 30 is connected to the inner periphery of the bottom 31 and is located inside the stator 20. The first tube 32 extends upward from the bottom 31. The first tube 32 has a cylindrical shape centered on the central axis C of the shaft 40, and the upper and lower ends of the first tube 32 are open. The shaft 40 passes through the center of the first tube 32 along the axial direction. The first tube 32 includes, from top to bottom, a first portion 32A, a second portion 32B, and a third portion 32C.

[0025] The outer peripheral surface of the first portion 32A and the outer peripheral surface of the second portion 32B are formed flush. The inner peripheral surface of the second portion 32B is located inside the inner peripheral surface of the first portion 32A. Therefore, the inner peripheral surface of the second portion 32B includes a step 32Ba that protrudes inward relative to the inner peripheral surface of the first portion 32A. The inner peripheral surface of the second portion 32B is located inside the inner peripheral surface of the third portion 32C. Therefore, the inner peripheral surface of the second portion 32B includes a step 32Bb that protrudes inward relative to the inner peripheral surface of the third portion 32C. The outer peripheral surface of the third portion 32C is located outside the outer peripheral surface of the second portion 32B. Therefore, the outer peripheral surface of the third portion 32C includes a step 32Ca that protrudes outward relative to the outer peripheral surfaces of the second portion 32B and the first portion 32A.

[0026] The second cylinder 33 (outer cylinder) of the base 30 is connected to the outer periphery of the bottom portion 31 and surrounds the bottom portion 31. The second cylinder 33 extends upward from the bottom portion 31. The second cylinder 33 has a cylindrical shape centered on the central axis C of the shaft 40, and the upper end of the second cylinder 33 is open. In the axial direction, the upper surface 33A of the second cylinder 33 is located at approximately the same position as the step portion 32Ca of the first cylinder 32. In the radial direction, the dimension (inner diameter) of the inner surface of the second cylinder 33 is larger than the dimension (outer diameter) of the outer surface of the rotor 10.

[0027] As shown in FIG. 2 , a pair of bearings 41, 41 are provided on the upper and lower sides in the axial direction. The bearings 41 are not particularly limited, and may be, for example, ball bearings. The upper bearing 41 is fixed to the first tube 32 inside the first tube 32, for example, by fixing the outer edge of the lower surface of the upper bearing 41 to the step 32Ba of the first tube 32, for example, by adhesive, and by fixing the outer surface of the upper bearing 41 to the inner surface of the first portion 32A of the first tube 32, for example, by adhesive. The lower bearing 41 is fixed to the first tube 32 inside the first tube 32, for example, by fixing the outer edge of the upper surface of the lower bearing 41 to the step 32Bb of the first tube 32, for example, by adhesive, and by fixing the outer surface of the lower bearing 41 to the inner surface of the third portion 32C of the first tube 32, for example, by adhesive.

[0028] 2, the shaft 40 passes through the inside of the inner circumferential surface of the upper bearing 41 and the inside of the inner circumferential surface of the lower bearing 41, and is fixed, for example by press fitting, to the inner circumferential surfaces of the upper bearing 41 and the lower bearing 41. With this configuration, each of the pair of bearings 41, 41 supports the shaft 40 rotatably relative to the base 30 and the stator 20.

[0029] As shown in FIG. 2, the stator 20 includes a stator core 21, an insulator 22, and a plurality of coils .

[0030] The stator core 21 has an annular cylindrical shape when viewed in the axial direction. The stator core 21 may have a configuration in which, for example, thin annular electromagnetic steel sheets (magnetic materials) are stacked along the axial direction. The stator core 21 is fixed to the first tube 32 at the outside of the first tube 32, for example, by fixing the inner edge of the lower surface of the stator core 21 to a step portion 32Ca of the first tube 32, for example, by adhesive, and by fixing the inner circumferential surface of the stator core 21 to the respective outer circumferential surfaces of the first portion 32A and the second portion 32B of the first tube 32, for example, by adhesive. Most of the stator core 21 is covered by the insulator 22, but the outer circumferential surface 21A of the stator core 21 is exposed from the insulator 22. The multiple coils 23 are provided at predetermined intervals in the circumferential direction of the stator core 21 and wound around predetermined portions of the insulator 22. Therefore, the coils 23 and the stator core 21 are insulated from each other via the insulator 22 .

[0031] As shown in FIG. 2, the rotor 10 includes a case 11 (yoke) and a magnet 12.

[0032] The case 11 has a cylindrical shape with a bottom, and in this embodiment, has a cylindrical shape centered on the central axis C of the shaft 40. That is, the case 11 includes a cylindrical tube portion 11B and a lid portion 11A that closes the upper end of the tube portion 11B. The lower end of the tube portion 11B is open. Furthermore, the lower end surface 11Ba of the tube portion 11B is slightly below the upper surface 33A of the second tube 33 of the base 30 and slightly inside the second tube 33. The lid portion 11A includes an inclined portion 11Aa and a flat portion 11Ab. The inclined portion 11Aa is a portion that extends upward and inward from the upper end of the tube portion 11B, inclining at a predetermined angle (for example, approximately 45°). The flat portion 11Ab is a flat portion that extends radially inward from the upper end of the inclined portion 11Aa. The flat plate portion 11Ab has a ring-like shape (annular in this embodiment) when viewed in the axial direction, and a hole 11H penetrating the flat plate portion 11Ab in the axial direction is formed at the center of the flat plate portion 11Ab. The upper end portion 40A of the shaft 40 is fixed, for example, by press-fitting, to the inner circumferential surface of the flat plate portion that forms this hole 11H. Therefore, the case 11 rotates integrally with the shaft 40.

[0033] The magnet 12 has a cylindrical shape extending in the axial direction, and may have a configuration in which north and south poles are alternately formed in the circumferential direction. The magnet 12 is fixed to the inner peripheral surface of the case 11 and surrounds the stator 20 in the radial direction. In other words, the rotor 10 surrounds the stator 20. The inner peripheral surface 12A of the magnet 12 faces the outer peripheral surface 21A (magnetic pole portion) of the stator core 21 in the radial direction via an air gap. The magnet 12 of this embodiment has a length in the axial direction that is approximately equal to the entire length of the cylindrical portion 11B of the case 11. In other words, the lower end surface 12B of the magnet 12 and the end surface 11Ba of the cylindrical portion 11B are approximately flush with each other. However, the axial length of the magnet 12 is not limited to this. The magnet 12 rotates integrally with the shaft 40 and the case 11.

[0034] The substrate 50 is preferably formed of a flexible material, and in this embodiment, it is a film, an FPC (Flexible Printed Circuit). As shown in FIG. 4, the substrate 50 is a thin (the length in the axial direction is smaller than the outer diameter) plate-like member having a ring-like (annular) shape when viewed in the axial direction. The size (diameter (inner diameter of the substrate 50)) of the inner peripheral portion 50B of the substrate 50 is slightly larger than the size (outer diameter) of the third portion 32C of the first tube 32 in the base 30. The size (diameter (outer diameter of the substrate 50)) of the outer peripheral portion 50A of the substrate 50 is slightly smaller than the size (outer diameter) of the bottom portion 31 of the base 30 and the size (inner diameter) of the second tube 33 of the base 30. With this configuration, the substrate 50 is placed on the upper surface 31A of the bottom portion 31, covering the upper surface 31A almost entirely, and is surrounded by the second tube 33 (outer tube).

[0035] 4, the substrate 50 includes a first portion 51, a second portion 52, and a slit 53 formed between the first portion 51 and the second portion 52 in the circumferential direction of the substrate 50. In this embodiment, the substrate 50 includes three first portions 51. That is, the number of first portions 51 corresponds to the number of recesses 34 (three in this embodiment) formed in the bottom portion 31 of the base 30. The three first portions 51 are provided at approximately equal intervals (that is, at intervals of approximately 120°) in the circumferential direction of the substrate 50.

[0036] Each of the three first portions 51 is separated from the second portion 52 by a pair of slits 53, 53 adjacent to each other in the circumferential direction of the substrate 50 (hereinafter, sometimes referred to as a "slit pair 53, 53"). In this embodiment, the substrate 50 has three slit pairs 53, 53 (i.e., six slits 53). The two slits 53, 53 constituting one slit pair 53, 53 extend parallel to each other from the outer circumferential portion 50A toward the inside of the substrate 50. Specifically, the two slits 53, 53 constituting one slit pair 53, 53 extend over the same length in the radial direction to a position midway between the outer circumferential portion 50A and the inner circumferential portion 50B of the substrate 50. Therefore, the first portion 51 separated from the second portion 52 by one slit pair 53, 53 has a substantially rectangular shape when viewed in the axial direction. The first portion 51 is connected to the second portion 52 by a connecting portion 54 extending perpendicular to each of the two slits 53, 53 that make up one slit pair 53, 53.

[0037] The first portion 51 has a shape corresponding to the bottom surface 34A and inclined surface 34B that form the recess 34 of the base 30. Specifically, the first portion 51 includes an inclined portion 51B including the connecting portion 54, and a flat portion 51A that connects to the outer end of the inclined portion 51B (the end opposite the connecting portion 54). The inclined portion 51B has substantially the same shape and area as the inclined surface 34B of the recess 34 of the base 30, and an inclination angle substantially the same as the inclination angle θ of the inclined surface 34B. The flat portion 51A has substantially the same shape (i.e., a rectangular shape when viewed in the axial direction) and area as the bottom surface 34A. The flat portion 51A is connected to the second portion 52 via the inclined portion 51B and the connecting portion 54, so that a step in the axial direction is formed in the substrate 50 by the flat portion 51A and the second portion 52.

[0038] The shape and size of the first portion 51 can be changed as appropriate in accordance with the shape and size of the recess 34 so as to create a step in the axial direction relative to the second portion 52. The pattern of the slit pairs 53, 53 can also be changed as appropriate in accordance with the shape and size of the first portion 51.

[0039] FIG. 5 is an enlarged view showing the vicinity of the connection portion 54. As shown in FIG. 5, the substrate 50 includes a joining portion 55 that joins the connection portion 54 and the end surface 52SF of the second portion 52 formed by the slit 53. In this embodiment, the joining portion 55 has a rounded, notched shape that protrudes toward the inside of the substrate 50. Specifically, the joining portion 55 has a roughly three-quarter arc shape. With this configuration, an external force acting on the joining portion between the connection portion 54 and the end surface 52SF is dispersed by the rounded joining portion 55, effectively preventing cracks from occurring in the substrate 50 starting from the joining portion between the connection portion 54 and the end surface 53SF. However, a configuration such as the joining portion 55 need not be provided at the joining portion between the connection portion 54 and the end surface 52SF.

[0040] 2 and 3 , by placing the substrate 50 having the above-described configuration on the upper surface 31A of the bottom 31 of the base 30, the three first portions 51 of the substrate 50 fit one-to-one into the three recesses 34 of the base 30, and the first portions 51 are housed in the recesses 34. That is, in the motor 1, the first portions 51 are located below the second portions 52 in the substrate 50 placed on the bottom 31. Here, in this embodiment, the first portions 51 are gently bent along the inclined surfaces 34B when housed in the recesses 34, so that the first portions 51 are not bent at right angles to the second portions 52, and the application of an excessive load to the substrate 50 is suppressed.

[0041] Incidentally, a through hole TH (see FIG. 2) for wiring may be formed in the bottom portion 31, penetrating the bottom portion 31 in the axial direction. In FIG. 2, the through hole TH is indicated by a dashed line for convenience. Power may be supplied to the substrate 50 from the outside via wiring provided in the through hole TH. In this embodiment, the through hole TH for wiring is formed in a portion of the bottom portion 31 excluding the bottom surface 34A and the inclined surface 34B, which are regions forming the recess 34, i.e., in a portion 35 of the bottom portion 31 on which the second portion 52 of the substrate 50 is placed (see FIG. 4). As such, in this embodiment, as shown in FIG. 3, no hole penetrating the bottom portion 31 in the axial direction is formed in the recess 34 (i.e., the bottom surface 34A and the inclined surface 34B).

[0042] As shown in FIGS. 2 and 3 , an electronic component 70 is mounted on the upper surface 51Aa of the first portion 51 of the substrate 50. In other words, the substrate 50 has the electronic component 70 mounted on the surface (upper surface 51Aa) facing the stator 20 in the axial direction. In this specification, the electronic component 70 refers to an electronic component that is mounted on the substrate 50 and thereby protrudes from the substrate 50 in the axial direction. Examples of the electronic component include a driver IC serving as an electronic control component for controlling the motor, various sensors such as a Hall IC, a connector that electrically connects an external device and the motor via the substrate 50, and a component formed of a conductive material (e.g., solder) that electrically connects the end of the coil 23 to a land on the substrate 50. FIGS. 2 and 3 show an example in which the electronic component 70 is a Hall IC. FIG. 6 shows an example in which the electronic component 70 is a component formed of a conductive material, solder, that electrically connects the end of the coil 23 to a land on the substrate 50. 7 shows an example in which the electronic component 70 is a connector, which is a conductive member that electrically connects the end of the coil 23 to the substrate 50. The electronic component 70, which protrudes in the axial direction, is accommodated in the recess 34 by being mounted on the first portion 51 accommodated in the recess 34.

[0043] In addition, the first portion 51 may be mounted with a plurality of electronic components 70 including, for example, one or more of a driver IC, a Hall IC (see Figures 2 and 3), a member formed by solder (see Figure 6), a connector (see Figure 7), and other electronic components.

[0044] When power is supplied to the substrate 50 and current flows through the coil 23 of the stator 20 via the lands of the substrate 50, etc., a magnetic interaction occurs between the outer peripheral surface 21A of the stator core 21 and the inner peripheral surface 12A of the magnet 12, causing the rotor 10 to rotate about the central axis C of the shaft 40 relative to the base 30 and the stator 20 located inside the rotor 10. In this way, the motor 1 of this embodiment is configured as an outer rotor type motor.

[0045] As described above, the motor 1 includes the base 30, the stator 20 provided on the base 30, the rotor 10 surrounding the stator 20, and the substrate 50 having the electronic components 70 mounted on the surface facing the stator 20 in the axial direction. In the motor 1, the base 30 includes a recess 34 and a second cylinder 33 (outer cylinder) surrounding the substrate 50, and the electronic components 70 are housed in the recess 34.

[0046] According to such a motor 1, the substrate 50 is surrounded by the second tube 33, so that, as shown in FIG. 2, the substrate 50 and the electronic components 70 mounted on the substrate 50 are prevented from being exposed from above to external foreign matter (e.g., dust, dirt, etc.).

[0047] Furthermore, in the motor 1, the first portion 51, on whose top surface 51Aa the electronic components 70 are mounted, is placed on the bottom surface 34A of the recess 34. Here, in this embodiment, as described above, the recess 34 does not have a through-hole TH that axially penetrates the bottom portion 31. That is, in this embodiment, the through-hole TH is not formed on the underside of the first portion 51 of the substrate 50. Therefore, in the motor 1, the electronic components 70 mounted on the substrate 50 and the first portion 51 are prevented from being exposed to external foreign matter from below.

[0048] Furthermore, in the motor 1, as described above, the electronic components 70 are mounted on the upper surface 51Aa of the first portion 51 of the substrate 50 and are thereby housed in the recess 34 of the bottom portion 31. That is, in the motor 1, the electronic components 70 are prevented from protruding upward (toward the stator 20) from the upper surface 31A of the bottom portion 31. Alternatively, even if the electronic components 70 protrude upward from the upper surface 31A, the length of the protrusion is small. Therefore, there is no need to secure a space in the axial direction between the motor main body, which is made up of the stator 20 and the rotor 10, and the bottom portion 31 of the base 30 to accommodate the electronic components 70 that protrude upward, and the axial space between the motor main body and the bottom portion 31 can be narrowed. Therefore, the motor 1 can be made even more compact than conventional motors.

[0049] Although the present invention has been described above using the above embodiment as an example, the present invention is not limited to this.

[0050] For example, in the above-described embodiment, an example was described in which no through hole TH for wiring is formed in the recess 34. However, such a through hole TH may be formed in the recess 34. For example, when connecting wiring to the first portion 51 of the substrate 50 via the through hole TH formed in the recess 34, a protrusion (i.e., an electronic component in this specification) made of a conductive material such as solder may be provided to electrically connect the wiring to the connection portion of the first portion 51, and the through hole TH may be filled with resin or the like to prevent exposure to foreign matter. However, as described above, because the first portion 51 is housed in the recess 34, the protrusion (electronic component) is prevented from protruding above the upper surface 31A of the bottom portion 31. Therefore, even when the through hole TH is formed in the recess 34, the motor can be made even smaller than conventional motors.

[0051] Those skilled in the art can modify the motor of the present invention as appropriate based on conventionally known knowledge. As long as the motor of the present invention is still provided with the configuration of the present invention even after such modification, it will of course be included in the scope of the present invention. [Explanation of symbols]

[0052] REFERENCE SIGNS LIST 1...motor, 10...rotor, 20...stator, 30...base, 31...bottom, 34...recess, 40...shaft, 41...bearing, 50...substrate, 51...first portion, 52...second portion, 53...slit, 70...electronic component

Claims

1. With the base, a stator provided on the base; a rotor surrounding the stator; a substrate having electronic components mounted on a surface facing the stator in the axial direction; Equipped with the base includes a recess and an outer cylinder surrounding the substrate; The motor, wherein the electronic component is housed in the recess.

2. The motor according to claim 1 , wherein the substrate is formed of a film.

3. the substrate includes a first portion on which the electronic component is mounted, a second portion, and a slit formed between the first portion and the second portion; The motor of claim 2 , wherein the first portion is housed in the recess.

4. 4. The motor according to claim 1, wherein the base comprises an inner cylinder located inside the stator, a bottom portion facing the stator in the axial direction, and the outer cylinder surrounding the bottom portion.

5. A shaft and a bearing that supports the shaft relative to the inner cylinder; The motor of claim 4 comprising:

Images