JP2022151620A - Motor and electronic device - Google Patents

Abstract

To provide a motor and an electric device for increasing a mounting area of an axial end face of a substrate of the motor.SOLUTION: A bearing holder 5 of a motor 100 is separate from a housing 4 arranged on one of an axial direction than a stator 2, and rotatably supports a shaft 10 via a bearing 511. One of the housing 4 and the bearing holder 5 has a first recess portion. The other has a first protrusion portion that fits into the first recess portion. The first protrusion portion is arranged on one of the axial direction than the first holder portion 51 of the bearing holder 5. The radially outer end portion of the first protrusion portion is arranged radially inward of the radially outer end portion of the first holder portion 51. The radially inner end portion of the substrate that extends in a radial direction is arranged radially outward from at least a portion of the first protrusion portion and is arranged at a position that overlaps with at least a portion of the first holder portion 51 in the axial direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to motors and electronic devices.

Conventionally, a motor is known in which a circuit board is housed inside a motor cover. For example, in an outer rotor type motor, the circuit board is arranged axially below the rotor. (For example, see JP 2014-183627)

JP 2014-183627 A

In the motor described above, the mounting area of the circuit board is limited when the outer diameter of the circuit board is constant. On the other hand, it is desired to increase the mounting area of the circuit board.

SUMMARY OF THE INVENTION It is an object of the present invention to increase the mounting area of the axial end face of a substrate of a motor.

An exemplary motor of the invention comprises a rotor, a stator, a housing, a bearing holder and a substrate. The rotor has a shaft rotatable about an axially extending central axis and a magnet. The stator radially faces the magnet. The housing is arranged in one axial direction relative to the stator. The bearing holder is separate from the housing and rotatably supports the shaft via bearings. The substrate extends radially. The bearing holder has a first holder portion. The first holder part radially faces the bearing. A component of one of the housing and the bearing holder has a first recess. The first concave portion is recessed from the other constituent portion toward the one constituent portion in the axial direction. The other component has a first protrusion. The first projecting portion is arranged on the one side in the axial direction relative to the first holder portion, projects from the other component portion toward the one component portion in the axial direction, and fits into the first recess. A radially outer end portion of the first projecting portion is arranged radially inwardly of a radially outer end portion of the first holder portion. A radially inner end portion of the substrate is arranged radially outward of at least a portion of the first projection portion and is arranged at a position axially overlapping with at least a portion of the first holder portion. .

An exemplary electronic device of the invention has the motor described above.

According to the exemplary motor and electronic device of the present invention, the mounting area of the axial end surface of the substrate of the motor can be increased.

FIG. 1 is a vertical cross-sectional view showing a configuration example of a motor according to an embodiment. FIG. 2 is a cross-sectional view of the motor. FIG. 3 is a perspective view of the motor. FIG. 4 is a longitudinal sectional view showing a modification of the inner wall. FIG. 5 is a cross-sectional view showing a first modification of the substrate rotation suppression structure at the radially inner end portion. FIG. 6A is a vertical cross-sectional view showing a second modification of the substrate rotation suppressing structure at the radially inner end portion. FIG. 6B is a cross-sectional view showing a second modification of the substrate rotation suppression structure at the radially inner end portion. FIG. 7A is a vertical cross-sectional view showing a third modification of the substrate rotation suppression structure at the radially inner end portion. FIG. 7B is a cross-sectional view showing a third modification of the substrate rotation suppressing structure at the radially inner end portion. FIG. 8 is a cross-sectional view showing a fourth modification of the substrate rotation suppressing structure at the radially inner end portion. FIG. 9 is a cross-sectional view showing a fifth modification of the substrate rotation suppressing structure at the radially inner end portion. FIG. 10A is a vertical cross-sectional view showing a sixth modification of the substrate rotation suppressing structure at the radially inner end portion. FIG. 10B is a cross-sectional view showing a sixth modification of the substrate rotation suppressing structure at the radially inner end portion. FIG. 11A is a vertical cross-sectional view showing an example of a substrate rotation suppressing structure at a radially outer end portion. FIG. 11B is a vertical cross-sectional view showing an example of the substrate rotation suppression structure at the radially outer end portion. FIG. 12A is a vertical cross-sectional view showing a first modification of the substrate rotation suppressing structure at the radially outer end portion. FIG. 12B is a vertical cross-sectional view showing a first modification of the substrate rotation suppressing structure at the radially outer end portion. FIG. 13A is a vertical cross-sectional view showing a second modification of the substrate rotation suppressing structure at the radially outer end portion. FIG. 13B is a vertical cross-sectional view showing a second modification of the substrate rotation suppression structure at the radially outer end portion. FIG. 14A is a vertical cross-sectional view showing a third modification of the substrate rotation suppressing structure at the radially outer end portion. FIG. 14B is a vertical cross-sectional view showing a third modification of the substrate rotation suppressing structure at the radially outer end portion. FIG. 15 is a longitudinal sectional view showing a configuration example of a motor according to a first modified example of the embodiment; FIG. 16 is a longitudinal sectional view showing a configuration example of a motor according to a second modified example of the embodiment; FIG. 17 is a schematic diagram of a device mounting a motor.

Exemplary embodiments are described below with reference to the drawings.

In this specification, in the motor 100, the direction parallel to the central axis CA is called "axial direction". Of the axial directions, the direction from the lid portion 32 to the housing 4 (to be described later) is called "one axial direction D1", and the direction from the housing 4 to the lid portion 32 is called "the other axial direction D2". In each component, the end in one axial direction D1 is called "one axial end", and the end in the other axial direction D2 is called "other axial end". Further, in the surface of each component, the surface facing the one axial direction D1 is called "one axial end surface", and the surface facing the other axial direction D2 is called "the other axial end surface".

Further, the direction perpendicular to the central axis CA is called "radial direction", and the direction of rotation about the central axis CA is called "circumferential direction Dr". Among the radial directions, the direction toward the central axis CA is called "radially inward", and the direction away from the central axis CA is called "radial outward". In each component, the radially inner end is referred to as the "radial inner end" and the radially outer end is referred to as the "radial outer end". In addition, among the side surfaces of each component, the side surface facing radially inward is referred to as the "radial inner surface", and the side surface facing radially outward is referred to as the "radial outer surface".

In addition, in terms of the positional relationship between any one of azimuth, line, and plane and any other, "parallel" means not only a state in which they do not intersect at all no matter how far they are extended, but also a state in which they are substantially parallel. include. Also, "perpendicular" and "perpendicular" respectively include not only the state in which the two intersect each other at 90 degrees, but also the state in which they are substantially perpendicular and the state in which they are substantially orthogonal. That is, "parallel", "perpendicular" and "perpendicular" each include a state in which the positional relationship between them has an angular deviation to the extent that it does not deviate from the gist of the present invention.

Note that these names are merely used for explanation, and are not intended to limit actual positional relationships, directions, names, and the like.

<1. motor 100>
FIG. 1 is a longitudinal sectional view showing a configuration example of a motor 100 according to an embodiment. FIG. 2 is a cross-sectional view of motor 100. As shown in FIG. FIG. 3 is a perspective view of the motor 100. FIG. Note that FIG. 1 shows a cross-sectional structure of the motor 100 cut along an imaginary plane including the central axis CA. FIG. 2 is a cross section of the motor 100 taken along an imaginary plane that includes the dashed-dotted line II-II in FIG. 1 and is perpendicular to the axial direction, viewed from the other axial direction D2 toward the one axial direction D1.

In this embodiment, the motor 100 is installed in a multifunction machine 500 (see FIG. 17, for example) having functions such as copying, printing, scanning, and facsimile. Note that the multi-function device 500 is an example of the “electronic device” of the present invention. The MFP 500 has a motor 100 . As a result, the mounting area of the axial end face of the substrate 6 of the motor 100 mounted on the multifunction machine 500 can be increased. However, this illustration does not limit the application of the motor 100 .

Motor 100 includes rotor 1 , stator 2 , cover portion 31 , lid portion 32 , housing 4 , bearing holder 5 and substrate 6 . In this embodiment, magnets 11 of the rotor 1 , which will be described later, are arranged radially outward of the stator 2 . That is, the motor 100 is of an outer rotor type. However, it is not limited to this example, and the magnets 11 of the rotor 1 may be arranged radially outward and inward of the stator 2 . That is, the motor 100 may be of the inner rotor type.

<1-1. rotor 1>
The rotor 1 is rotatable around a central axis CA extending in the axial direction. The rotor 1 has a shaft 10 and magnets 11 . As described above, motor 100 includes rotor 1 . The shaft 10 is rotatable around a central axis CA extending in the axial direction. The shaft 10 is the rotating shaft of the rotor 1 and extends axially along the central axis CA. The magnets 11 have magnetic poles different from each other. Each magnetic pole is arranged alternately in the circumferential direction Dr.

The rotor 1 further has a rotor lid portion 12 and a tubular rotor tubular portion 13 . The rotor lid portion 12 extends radially outward from the radial outer surface of the shaft 10 . A radial inner end portion of the rotor lid portion 12 is fixed to the shaft 10 . The rotor tubular portion 13 is arranged radially outward of the stator 2 and extends in the one axial direction D1 from the radially outer end portion of the rotor lid portion 12 . A magnet 11 is arranged on the radial inner surface of the rotor tubular portion 13 . The rotor tubular portion 13 is made of a magnetic material and also functions as a rotor yoke.

<1-2. Stator 2>
The stator 2 rotates the rotor 1 when driving the motor 100 . As described above, motor 100 includes stator 2 . The stator 2 radially faces the magnet 11 .

The stator 2 has a stator core 21 and a coil portion 22 . Stator core 21 is an annular magnetic body centered on central axis CA. In this embodiment, the stator core 21 is a laminate in which a plurality of plate-shaped electromagnetic steel sheets are laminated. A radially inner end portion of the stator core 21 is fixed to a radially outer surface of the bearing holder 5 to be described later. A radial outer surface of the stator core 21 faces the magnet 11 with a gap in the radial direction. The coil portion 22 is a winding member in which a conductive wire is wound around the stator core 21 via an insulator (not shown) having electrical insulation.

<1-3. cover portion 31>
The cover portion 31 is arranged radially outward of the rotor 1 and extends in the axial direction. Specifically, the cover portion 31 extends in the other axial direction D2 from a radially outer end portion of the housing 4, which will be described later. As described above, the motor 100 has the tubular cover portion 31 . The cover portion 31 accommodates the rotor 1 and the stator 2 . The cover portion 31 can protect the rotor 1 and the stator 2 accommodated therein. Also, since the cover portion 31 can be fixed to a predetermined member, the motor 100 can be fixed by various methods.

The cover portion 31 has a cover tubular portion 311 and a projecting wall portion 312 . The cover tubular portion 311 and the projecting wall portion 312 are tubular and extend in the axial direction. The protruding wall portion 312 protrudes from one axial end portion of the cylindrical cover portion 311 in the one axial direction D1. The radial inner surface of the projecting wall portion 312 is arranged radially outward from the radial inner surface of the cover tubular portion 311 . In other words, a step recessed radially outward is arranged on the radial inner surface of the one axial end of the cover portion 31 .

<1-4. lid portion 32>
The lid portion 32 extends radially inward from the other axial end portion of the cover portion 31 . The lid portion 32 covers the other axial end portion of the cover portion 31 . A cylindrical lid tubular portion 321 extending in the other axial direction D<b>2 is arranged at the radially inner end portion of the lid portion 32 . A bearing 322 is arranged on the radially inner surface of the lid tube portion 321 . The lid tube portion 321 rotatably supports the shaft 10 via bearings 322 . A ball bearing, sliding bearing, or the like can be used as the bearing 322 .

In this embodiment, the cover part 31 and the lid part 32 are different parts of the same member. However, it is not limited to this illustration, and the lid portion 32 may be a member different from the cover portion 31 . In this case, the radial outer end of the lid portion 32 is connected to the cover portion 31 . Welding, brazing using silver brazing or the like, soldering, screwing, fitting, or the like can be used as means for connecting the two.

<1-5. housing 4>
The housing 4 is arranged on the one axial side D<b>1 from the stator 2 . As mentioned above, motor 100 includes housing 4 . In this embodiment, the housing 4 is separate from the cover portion 31 . The housing 4 is attached to one axial end of the cover portion 31 and covers the one axial end of the cover portion 31 .

The housing 4 has a base portion 41 . The base portion 41 extends in a direction intersecting with the axial direction. The base portion 41 has a base recessed portion 411 . The base recessed portion 411 is an example of the “first recessed portion” of the present invention and is arranged in the housing 4 . The housing 4 has a base recess 411 recessed from the bearing holder 5 toward the housing 4 in the axial direction. In this embodiment, the base concave portion 411 is a through hole extending in the axial direction and penetrates the base portion 41 in the axial direction. However, this illustration does not exclude the configuration in which the base recess 411 does not penetrate the base portion 41 . For example, the base recessed portion 411 may be recessed from the other axial end portion of the base portion 41 in the one axial direction D1. Also, the one axial end of the base recess 411 may not reach the one axial end of the base 41 , and may be located on the other axial end D<b>2 of the one axial end of the base 41 .

Moreover, the housing 4 further has an inner wall portion 42 . The inner wall portion 42 extends axially from the base portion 41 and extends in the circumferential direction Dr. In the present embodiment, the inner wall portion 42 has a tubular shape and extends in the other axial direction D2 from the outer edge portion of the base concave portion 411 (that is, the radial inner end portion of the base portion 41). However, it is not limited to this example, and the inner wall portion 42 may extend from the outer edge of the base recess 411 in the one axial direction D1, or may extend from the outer edge of the base recess 411 to both sides in the axial direction. The inner wall portion 42 holds the bearing holder 5 . For example, in the present embodiment, one axial end of the bearing holder 5 is fitted to the inner wall portion 42 .

Moreover, the housing 4 further has an inner wall protrusion 43 . In addition, the inner wall protrusion 43 is an example of the "second protrusion" of the present invention. The inner wall protruding portion 43 protrudes from the other axial end portion of the inner wall portion 42 in the other axial direction D2 and extends in the circumferential direction Dr. In this embodiment, the inner wall protruding portion 43 has a tubular shape extending in the axial direction. The base recessed portion 411 includes the inner space of the tubular inner wall portion 42 and the inner wall protruding portion 43, and extends from the other axial end portion of the inner wall protruding portion 43 in the one axial direction D1. The radial outer surface of the inner wall protruding portion 43 is arranged radially inward from the radial outer surface of the inner wall portion 42 . That is, the outer diameter of the inner wall protruding portion 43 is smaller than the outer diameter of the inner wall portion 42 .

Moreover, the housing 4 further has an outer wall portion 44 . The outer wall portion 44 protrudes in the other axial direction D2 at the radially outer end portion of the housing 4 and extends in the circumferential direction Dr. Specifically, the outer wall portion 44 protrudes from the radially outer end portion of the base portion 41 in the other axial direction D2. The outer wall portion 44 is fixed to one axial end portion of the cover portion 31 . In this embodiment, the outer wall portion 44 is cylindrical, and at least the other axial end portion of the outer wall portion 44 fits inside the projecting wall portion 312 of the cover portion 31 . As a result, the radial outer end of the housing 4 is connected to the axial one end of the cover portion 31 . Note that at least one end in the axial direction of the projecting wall portion 312 may be fitted into the outer wall portion 44 without being limited to the above-described example. Moreover, the means for connecting the radially outer end of the housing 4 and the axial one end of the cover portion 31 is not limited to the above example. Welding, brazing using silver brazing, soldering, screwing, fitting, etc. can be used alone or in combination as means for connecting the two.

<1-6. Bearing holder 5>
The bearing holder 5 is separate from the housing 4 and rotatably supports the shaft 10 via bearings 511 . As mentioned above, the motor 100 has the bearing holder 5 . One axial end of the bearing holder 5 is held by the housing 4 .

The bearing holder 5 has a first holder portion 51 , a holder projecting portion 52 , a second holder portion 53 and a pedestal portion 54 .

The first holder portion 51 has a tubular shape extending in the axial direction. Inside the first holder portion 51, a portion of the shaft 10 on one side D1 in the axial direction and a bearing 511 are arranged. The first holder portion 51 radially faces the bearing 511 . As described above, the bearing holder 5 has the first holder portion 51 . The first holder portion 51 rotatably supports the shaft 10 via bearings 511 . In this embodiment, the bearing 511 is a sliding bearing. However, the bearing 511 is not limited to this example, and a single or a plurality of ball bearings may be used.

The holder protruding portion 52 is arranged on one side D1 in the axial direction from the first holder portion 51 , protrudes from the bearing holder 5 toward the housing 4 in the axial direction, and fits into the base recessed portion 411 . As mentioned above, the bearing holder 5 has the holder protrusion 52 . The holder projecting portion 52 is an example of the “first projecting portion” of the present invention, and is arranged on the bearing holder 5 . The radially outer end of the holder projecting portion 52 is arranged radially inward of the radially outer end of the first holder portion 51 . The holder projecting portion 52 is fixed to the inner wall portion 42 . For example, in the present embodiment, the holder projecting portion 52 has a columnar shape extending in the one axial direction D<b>1 from one axial end portion of the second holder portion 53 and is fitted to the inner wall portion 42 . By fixing the holder projecting portion 52 to the inner wall portion 42 , the bearing holder 5 can be fixed to the housing 4 .

The second holder portion 53 is arranged at one axial end portion of the first holder portion 51 . As described above, the bearing holder 5 further has the second holder portion 53 . In this embodiment, the second holder portion 53 is arranged between the first holder portion 51 and the holder projecting portion 52 in the axial direction. The second holder portion 53 has a holder bottom portion 531 . The holder bottom portion 531 is connected to one axial end portion of the first holder portion 51 and covers the one axial end portion of the first holder portion 51 . Also, the second holder portion 53 has a holder base portion 532 . The radial outer end of the holder base portion 532 is arranged radially inward of the radial outer end of the first holder portion 51 and radially outward of the radial outer end of the holder projecting portion 52 . placed in the direction of The holder base portion 532 protrudes from one axial end portion of the holder bottom portion 531 in the one axial direction D1. Further, the holder projecting portion 52 projects in the one axial direction D1 from the one axial end portion of the holder bottom portion 531 .

In the present embodiment, the first holder portion 51, the holder projecting portion 52, and the second holder portion 53 are different parts of the same member. However, it is not limited to this illustration, and at least one of these members may be a member different from the other members. In this case, the separate members can be connected using connection means such as welding, brazing using silver brazing or the like, soldering, screwing, or fitting.

The pedestal portion 54 protrudes radially outward from the radially outer end portion of the bearing holder 5 . The pedestal portion 54 is an example of the "second pedestal portion" of the present invention. As described above, the bearing holder 5 further has the pedestal portion 54 . The other axial end surface of the pedestal portion 54 is in contact with the stator 2 in the axial direction. In the present embodiment, the pedestal portion 54 protrudes radially outward from the radially outer end portion of the second holder portion 53 . Specifically, the pedestal portion 54 protrudes radially outward from the radially outer end portion of the holder bottom portion 531 . By doing so, the bearing holder 5 can hold the stator 2 more stably.

<1-7. Substrate 6>
Electronic components (not shown) are mounted on the axial end surface of the board 6 . The substrate 6 is arranged on the one axial side D<b>1 relative to the rotor tubular portion 13 and the stator 2 and on the other axial direction D<b>2 relative to the housing 4 . The substrate 6 extends radially. As mentioned above, motor 100 includes substrate 6 .

In this embodiment, the substrate 6 has an annular shape surrounding the central axis CA. This makes it possible to increase the mounting area of the axial end surface of the substrate 6, particularly in the circumferential direction Dr. However, the shape of the substrate 6 is not limited to that illustrated in this embodiment. For example, the substrate 6 may spread in an arc shape in the circumferential direction Dr.

The radially inner end portion of the substrate 6 is arranged radially outward from at least part of the holder projecting portion 52 . In addition, the radially inner end portion of the substrate 6 is arranged at a position overlapping at least a portion of the first holder portion 51 in the axial direction.

The radially outer end portion of the holder projecting portion 52 , which is at least partially arranged radially inwardly of the radially inner end portion of the substrate 6 , is radially inwardly of the radially outer end portion of the first holder portion 51 . , the substrate 6 can be expanded radially inward to a position overlapping at least a portion of the first holder portion 51 in the axial direction. Therefore, the radial width of the substrate 6 can be made wider. Therefore, the mounting area of the axial end surface of the substrate 6 of the motor 100 can be increased.

Further, since the radially inner end portion of the substrate 6 axially faces the surface of the bearing holder 5 facing the one axial direction D1, the movement of the substrate 6 toward the other axial direction D2 can be suppressed by the bearing holder 5.

Further, the radial inner end portion of the substrate 6 axially faces the one axial end surface of the holder base portion 532 . In this way, the substrate 6 is moved radially inward to a position axially facing the one axial end surface of the holder base portion 532 arranged radially inwardly of the radially outer end portion of the first holder portion 51 . can be expanded. Therefore, the radial width of the substrate 6 can be made wider. Therefore, the mounting area of the axial end surface of the substrate 6 can be increased.

In the present embodiment, the radial inner end portion of the substrate 6 axially faces the one axial end surface of the second holder portion 53 .

The radially inner portion of the substrate 6 is arranged to face the radially outer surface of the inner wall protrusion 43 in the radial direction. In this way, the radially inward movement of the substrate 6 can be suppressed by the inner wall protruding portion 43 . In this embodiment, as shown in FIG. 1 , the radially inner portion of the substrate 6 is in contact with the radially outer surface of the inner wall protruding portion 43 . However, it is not limited to the example of FIG. 1 , and the radially inner portion of the substrate 6 may be axially opposed to the radially outer surface of the inner wall protruding portion 43 with a gap therebetween.

One axial end surface of the substrate 6 axially faces the other axial end surface of the inner wall portion 42 . In this way, the movement of the substrate 6 in the one axial direction D1 can be suppressed by the inner wall portion 42 .

Preferably, one axial end surface of the substrate 6 is in contact with the other axial end surface of the inner wall portion 42 at the radially inner end portion of the substrate 6 . At the radially inner end portion of the substrate 6, the other axial end surface of the substrate 6 is in contact with the surface of the bearing holder 5 facing the one axial direction D1. For example, as shown in FIG. 1 , the other axial end face of the substrate 6 contacts the one axial end face of the second holder portion 53 at the radially inner end portion of the substrate 6 . In this way, the radial inner end portion of the substrate 6 can be clamped and fixed between the surface of the bearing holder 5 facing the one axial direction D1 and the other axial end surface of the inner wall portion 42 . The above example does not exclude a configuration in which one axial end face of the substrate 6 faces the other axial end face of the inner wall portion 42 with a gap therebetween at the radially inner end portion of the substrate 6 . Further, in the above example, the other axial end surface of the substrate 6 at the radial inner end portion of the substrate 6 is spaced from the surface facing the one axial direction D1 of the bearing holder 5 (for example, the one axial end surface of the holder base portion 532). does not exclude axially opposed configurations with

In addition, the other axial end surface of the substrate 6 contacts the one axial end surface of the holder base portion 532 at the radially inner end portion of the substrate 6 . At the radially inner end portion of the substrate 6 , one axial end surface of the substrate 6 contacts at least part of the surface of the housing 4 facing the other axial direction. In this way, the radially inner end portion of the substrate 6 can be clamped and fixed between the one axial end surface of the holder base portion 532 and at least a portion of the surface of the housing 4 facing the other axial direction. In the above example, the one axial end surface of the substrate 6 axially faces at least a part of the surface of the housing 4 facing the other axial direction with a gap at the radially inner end portion of the substrate 6. do not exclude

In this embodiment, as shown in FIG. 1 , one axial end surface of the substrate 6 contacts the other axial end surface of the inner wall portion 42 at the radially inner end portion of the substrate 6 . At the radially inner end portion of the substrate 6 , the other axial end surface of the substrate 6 contacts the one axial end surface of the holder base portion 532 . In this way, the radial inner end portion of the substrate 6 can be clamped and fixed between the one axial end surface of the holder base portion 532 and the other axial end surface of the inner wall portion 42 .

Here, FIG. 4 is a longitudinal sectional view showing a modification of the inner wall portion 42. As shown in FIG. FIG. 4 is a partially deformed and enlarged view of portion IV surrounded by a dashed line in FIG. More preferably, the inner wall portion 42 has a pedestal portion 421 as shown in FIG. The pedestal portion 421 is an example of the "first pedestal portion" of the present invention. The pedestal portion 421 protrudes radially outward at the other axial end portion of the inner wall portion 42 . The one axial end face of the substrate 6 is further in contact with the other axial end face of the pedestal portion 421 . Note that, in the present embodiment, the pedestal portion 421 extends in the circumferential direction Dr and preferably has an annular shape. However, the pedestal portion 421 is not limited to this example, and may be a single pedestal portion 421 or a plurality of protrusions arranged in the circumferential direction Dr. In this way, the inner wall portion 42 sandwiching the radially inner end portion of the substrate 6 together with the bearing holder 5 can more stably fix the substrate 6 by the pedestal portion 421 . Note that this illustration does not exclude a configuration in which the inner wall portion 42 does not have the pedestal portion 421 .

Further, one axial end face of the substrate 6 axially faces a portion of the outer wall portion 44 at the radially outer end portion of the substrate 6 . Further, the other axial end surface of the substrate 6 faces a portion of the cover portion 31 in the axial direction at the radially outer end portion of the substrate 6 . For example, one axial end face of the substrate 6 axially faces the other axial end face of the outer wall portion 44 . Further, the other axial end surface of the substrate 6 axially faces the one axial end surface of the tubular cover portion 311 . In this way, the movement of the substrate 6 in the axial direction can be suppressed by a portion of the outer wall portion 44 and a portion of the cover portion 31 at the radially outer end portion of the substrate 6 .

Preferably, one axial end surface of the substrate 6 is in contact with a portion of the outer wall portion 44 at the radially outer end portion of the substrate 6 . Further, the other axial end surface of the substrate 6 contacts a portion of the cover portion 31 at the radially outer end portion of the substrate 6 . For example, one axial end face of the substrate 6 contacts the other axial end face of the outer wall portion 44 . Further, the other axial end face of the substrate 6 is in contact with the one axial end face of the tubular cover portion 311 . In this way, the radially outer end portion of the substrate 6 can be clamped and fixed by a portion of the outer wall portion 44 and a portion of the cover portion 31 . However, the above example does not exclude a configuration in which one axial end surface of the substrate 6 faces the other axial end surface of the outer wall portion 44 with a gap therebetween at the radially outer end portion of the substrate 6 . Further, in the above example, the other axial end face of the substrate 6 is spaced apart from a part of the cover portion 31 (for example, one axial end portion of the cylindrical cover portion 311) at the radial outer end portion of the substrate 6. It does not preclude a configuration facing directions.

Alternatively, an intermediate member such as rubber or sponge may be interposed between the one axial end surface of the substrate 6 and a portion of the outer wall portion 44 at the radially outer end portion of the substrate 6 . An intermediate member such as rubber or sponge may be interposed between the other axial end surface of the substrate 6 and a portion of the cover portion 31 .

Further, a rotation suppressing structure for the substrate 6 is arranged at the radially inner end portion and the radially outer end portion of the substrate 6 . The anti-rotation structures are arranged at both the radially inner end and the radially outer end of the substrate 6 in this embodiment. However, it is not limited to this example, and the rotation suppressing structure may be arranged at only one of the radially inner end portion and the radially outer end portion of the substrate 6 .

<1-8. Rotation Suppressing Structure of Substrate 6 at Radial Direction Inner End>
Next, a structure for suppressing rotation of the substrate 6 at the radially inner end will be described.

<1-8-1. Example>
In this embodiment, as shown in FIG. 2 , the inner wall protruding portion 43 has a convex portion 431 . The convex portion 431 is an example of the "first convex portion" of the present invention in the embodiment. The convex portion 431 protrudes radially outward at the radially outer end portion of the inner wall protruding portion 43 . In FIG. 2, the protrusion 431 protrudes from the inner wall protrusion 43 toward the substrate 6 and faces a part of the substrate 6 in the circumferential direction Dr. With this facing structure, on the radially inner side of the substrate 6, rotation of the substrate 6 in the direction from the convex portion 431 toward the part of the substrate 6 in the circumferential direction Dr can be suppressed.

Specifically, the substrate 6 has an inner recess 611 . The inner recess 611 is arranged at the radially inner end of the substrate 6 and is recessed radially outward. It should be noted that the inner concave portion 611 is an example of the "second concave portion" of the present invention in the embodiment. The inner recess 611 is recessed in the direction from the inner wall protrusion 43 toward the substrate 6 and accommodates at least a portion of the protrusion 431 . The inner surface of the inner concave portion 611 facing one circumferential direction faces the other circumferential end surface of the convex portion 431 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, the inner surface facing the other circumferential direction of the inner concave portion 611 faces the one circumferential direction end surface of the convex portion 431 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially inner side of the substrate 6 .

<1-8-2. Variation>
In addition, the rotation suppressing structure of the substrate 6 at the radial inner end portion is not limited to the example illustrated in FIG. 2 . Here, with reference to FIGS. 5 to 10B, first to sixth modifications of the structure for suppressing rotation of the substrate 6 at the radially inner end will be described. FIG. 5 is a cross-sectional view showing a first modification of the rotation suppressing structure of the substrate 6 at the radially inner end portion. FIG. 6A is a vertical cross-sectional view showing a second modification of the rotation suppressing structure of the substrate 6 at the radially inner end portion. FIG. 6B is a cross-sectional view showing a second modification of the rotation suppressing structure of the substrate 6 at the radially inner end portion. FIG. 7A is a vertical cross-sectional view showing a third modification of the rotation suppressing structure of the substrate 6 at the radially inner end portion. FIG. 7B is a cross-sectional view showing a third modification of the rotation suppressing structure of the substrate 6 at the radially inner end portion. FIG. 8 is a cross-sectional view showing a fourth modification of the structure for suppressing rotation of the substrate 6 at the radially inner end portion. FIG. 9 is a cross-sectional view showing a fifth modification of the rotation suppressing structure of the substrate 6 at the radially inner end portion. FIG. 10A is a vertical cross-sectional view showing a sixth modification of the rotation suppressing structure of the substrate 6 at the radially inner end portion. FIG. 10B is a cross-sectional view showing a sixth modification of the rotation suppressing structure of the substrate 6 at the radially inner end portion. 5, 6B, 7B, 8, and 9 correspond to the portion V enclosed by the dashed line in FIG. Also, FIGS. 6A, 7A, and 10A correspond to portion IV surrounded by dashed lines in FIG. Also, FIG. 10B shows a cross section of the motor 100 cut along an imaginary plane that includes the dashed-dotted line XB--XB in FIG. 10A and is perpendicular to the axial direction, viewed from the other axial direction D2 toward the one axial direction D1.

In addition, in the first to sixth modifications of the rotation suppressing structure of the substrate 6 at the radially inner end portion, configurations different from the embodiment of FIG. 2 will be described. Also, the same reference numerals are assigned to the same components as those in the embodiment of FIG. 2, and the description thereof may be omitted.

<1-8-2-1. First modification>
For example, in FIG. 5 the holder projection 52 has a projection 521 . In other words, the bearing holder 5 has the protrusion 521 . In addition, the convex portion 521 is an example of the “first convex portion” of the present invention in the first modified example. The protrusion 521 protrudes radially outward at the radially outer end of the holder protrusion 52 . In addition, the inner wall protruding portion 43 has a through hole 432 . The through hole 432 radially penetrates the inner wall protrusion 43 . In FIG. 5 , the protrusion 521 protrudes from the holder protrusion 52 toward the substrate 6 and is inserted through the through hole 432 . A radially outer end portion of the convex portion 521 protrudes radially outward from the inner wall protruding portion 43 and faces a portion of the substrate 6 in the circumferential direction Dr. With this facing structure, it is possible to suppress the rotation of the substrate 6 in the direction from the protrusion 521 toward the part of the substrate 6 in the circumferential direction Dr on the radially inner side of the substrate 6 .

Specifically, the inner recess 611 of the substrate 6 is recessed in the direction from the holder projecting portion 52 toward the substrate 6 and accommodates at least part of the projecting portion 521 . In addition, the inner recessed portion 611 is an example of the "second recessed portion" of the present invention in the first modified example. The other circumferential end face of the convex portion 521 faces the inner surface of the inner concave portion 611 facing one circumferential direction in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, one circumferential end surface of the convex portion 521 faces the inner surface of the inner concave portion 611 facing the other circumferential direction in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially inner side of the substrate 6 .

<1-8-2-2. Second modification>
In addition, as shown in FIGS. 6A and 6B, the second holder portion 53 may have a convex portion 533 . In other words, the bearing holder 5 has the protrusion 533 . The convex portion 533 is an example of the "first convex portion" of the present invention in the second modified example. The convex portion 533 protrudes in the one axial direction D<b>1 at one axial end portion of the second holder portion 53 . In FIG. 6A, the convex portion 533 protrudes from the second holder portion 53 in the direction toward the substrate 6 and faces a part of the substrate 6 in the circumferential direction Dr. With this facing structure, it is possible to suppress the rotation of the substrate 6 in the direction from the protrusion 533 toward the part of the substrate 6 in the circumferential direction Dr on the radially inner side of the substrate 6 .

Specifically, the substrate 6 has a recess 612 . The concave portion 612 is arranged on the other axial end surface of the substrate 6 on the radially inner side of the substrate 6 and is recessed in the one axial direction D1. The concave portion 612 is an example of the "second concave portion" of the present invention in the second modified example. The recess 612 may or may not pass through the substrate 6 in the axial direction.

The concave portion 612 is concave in the direction from the second holder portion 53 toward the substrate 6 and accommodates at least part of the convex portion 533 . The inner surface of the concave portion 612 facing one circumferential direction faces the other circumferential end surface of the convex portion 533 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, the inner surface facing the other circumferential direction of the concave portion 612 faces the one circumferential direction end surface of the convex portion 533 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially inner side of the substrate 6 .

<1-8-2-3. Third modification>
Moreover, as shown in FIGS. 7A and 7B, the inner wall portion 42 may have a convex portion 422 . In other words, the bearing holder 5 has the protrusion 422 . In addition, the convex portion 422 is an example of the “first convex portion” of the present invention in the third modified example. The convex portion 422 protrudes in the other axial direction D<b>2 at the other axial end portion of the inner wall portion 42 . In FIG. 7A, the convex portion 422 protrudes from the inner wall portion 42 toward the substrate 6 and faces a portion of the substrate 6 in the circumferential direction Dr. With this facing structure, it is possible to suppress the rotation of the substrate 6 in the direction from the convex portion 422 toward the part of the substrate 6 in the circumferential direction Dr on the radially inner side of the substrate 6 .

Specifically, the substrate 6 has a recess 613 . The concave portion 613 is arranged on the one axial end face of the substrate 6 on the radially inner side of the substrate 6 and is recessed in the other axial direction D2. The concave portion 613 is an example of the "second concave portion" of the present invention in the third modified example. The recess 613 may or may not pass through the substrate 6 in the axial direction.

The recess 613 is recessed in the direction from the inner wall portion 42 toward the substrate 6 and accommodates at least part of the projection 422 . The inner surface of the concave portion 613 facing one circumferential direction faces the other circumferential end surface of the convex portion 422 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, the inner surface facing the other circumferential direction of the concave portion 613 faces the one circumferential direction end surface of the convex portion 422 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially inner side of the substrate 6 .

<1-8-2-4. Fourth modification>
Alternatively, the substrate 6 may have an inner protrusion 614 as shown in FIG. In addition, the inner convex portion 614 is an example of the "first convex portion" of the present invention in the fourth modified example. The inner convex portion 614 protrudes radially inward at the radially inner end portion of the substrate 6 . In FIG. 8, the inner protrusion 614 protrudes from the substrate 6 toward the inner wall protrusion 43 and faces a portion of the inner wall protrusion 43 in the circumferential direction Dr. With this facing structure, it is possible to suppress the rotation of the substrate 6 in the radial direction inner side of the substrate 6 in the direction from the inner convex portion 614 toward the part of the inner wall projecting portion 43 in the circumferential direction Dr.

Specifically, the inner wall protrusion 43 has a recess 433 . The recessed portion 433 is arranged on the radially outer side surface of the inner wall projecting portion 43 and is recessed radially inward. The concave portion 433 is an example of the "second concave portion" of the present invention in the fourth modified example. The recess 433 may or may not penetrate the inner wall protruding portion 43 in the radial direction.

At least part of the inner protrusion 614 is accommodated in the recess 433 of the inner wall protrusion 43 . The other circumferential end surface of the inner convex portion 614 faces the inner surface of the concave portion 433 facing one circumferential direction in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, one circumferential end surface of the inner convex portion 614 faces the inner surface of the concave portion 433 facing the other circumferential direction in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially inner side of the substrate 6 .

<1-8-2-5. Fifth modification>
Also, the inner protrusion 614 may face a portion of the bearing holder 5 in the circumferential direction Dr. For example, as shown in FIG. 9, the inner protrusion 614 may face a portion of the holder protrusion 52 in the circumferential direction Dr. In addition, the inner convex portion 614 is an example of the "first convex portion" of the present invention in the fifth modified example. For example, the inner wall protrusion 43 has a through hole 432 . The through hole 432 radially penetrates the inner wall protrusion 43 . In FIG. 9 , the inner protrusion 614 protrudes from the substrate 6 toward the holder protrusion 52 and is inserted through the through hole 432 . A radial inner end portion of the inner protrusion 614 protrudes radially inward from the inner wall protruding portion 43 and faces a portion of the bearing holder 5 (for example, a portion of the holder protruding portion 52) in the circumferential direction Dr. With this facing structure, on the radially inner side of the substrate 6, the substrate 6 in the direction from the inner convex portion 614 toward the part of the bearing holder 5 (for example, part of the holder projecting portion 52) in the circumferential direction Dr. rotation can be suppressed.

Specifically, the holder protrusion 52 has a recess 522 . In other words, the bearing holder 5 has the recess 522 . The recessed portion 522 is arranged on the radially outer side surface of the holder projecting portion 52 and is recessed radially inward. The concave portion 522 is an example of the "second concave portion" of the present invention in the fifth modified example.

At least part of the inner protrusion 614 is accommodated in the recess 522 of the holder protrusion 52 . The other circumferential end face of the inner convex portion 614 faces the inner surface of the concave portion 522 facing one circumferential direction in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, one circumferential end surface of the inner convex portion 614 faces the inner surface of the concave portion 522 facing the other circumferential direction in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially inner side of the substrate 6 .

<1-8-2-6. Sixth modification>
Moreover, as shown in FIGS. 10A and 10B, the inner convex portion 614 may face a portion of the inner wall portion 42 in the circumferential direction Dr. In addition, the inner convex portion 614 is an example of the "first convex portion" of the present invention in the sixth modified example. For example, the other axial end portion of the inner wall portion 42 radially faces at least a portion of the radial inner end portion of the substrate 6 . At this time, the other axial end portion of the inner wall portion 42 may face at least a portion of the radial inner end portion of the substrate 6 in the radial direction with a gap therebetween. may be in contact with at least part of the 10A and 10B, the inner protrusion 614 protrudes from the substrate 6 in a direction toward a part of the other axial end of the inner wall part 42, and is located between the part of the other axial end of the inner wall part 42 and the circumferential direction Dr. Oppose. With this facing structure, it is possible to suppress the rotation of the substrate 6 in the radial direction inner side of the substrate 6 in the direction from the inner convex portion 614 toward the part of the inner wall portion 42 in the circumferential direction Dr.

Specifically, the inner wall portion 42 has a recess 423 . The recessed portion 423 is arranged on the radially outer surface of the inner wall portion 42 at the other axial end portion of the inner wall portion 42 and is recessed radially inward. The concave portion 423 is an example of the "second concave portion" of the present invention in the sixth modified example.

At least part of the inner convex portion 614 is accommodated in the concave portion 423 of the inner wall portion 42 . The other circumferential end surface of the inner convex portion 614 faces the inner surface of the concave portion 423 facing one circumferential direction in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, one circumferential end surface of the inner convex portion 614 faces the inner surface of the concave portion 423 facing the other circumferential direction in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially inner side of the substrate 6 .

<1-8-3. Summary>
Regarding the rotation suppressing structure of the substrate 6 at the radially inner end portion, the above-described embodiment and its first to sixth modifications may be employed as a single configuration. Moreover, the structure which combined at least 2 of these may be employ|adopted. Also, a configuration may be adopted in which at least one of these is provided in plurality in the circumferential direction Dr.

According to the above-described embodiment and its first to sixth modifications, at least one of the inner wall portion 42, the inner wall protruding portion 43, and the bearing holder 5, and one member of the substrate 6 are , having a first projection. The first convex portion protrudes in a direction from the one member mentioned above toward the other member. The first protrusion faces a portion of the other member in the circumferential direction Dr.

2 and 5 to 7B, when at least one of the inner wall portion 42, the inner wall protruding portion 43, and the bearing holder 5 is the above-described "one member", the above-described "first The convex portion” is one of the convex portion 422 (see FIGS. 7A and 7B), the convex portion 431 (see FIG. 2), the convex portion 521 (see FIG. 5), and the convex portion 533 (see FIGS. 6A and 6B). At least one. The “other member” mentioned above is the substrate 6 .

On the other hand, as shown in FIGS. 8 to 10B , when the substrate 6 is the “one member” described above, the “first protrusion” described above is the inner protrusion 614 . Also, the above-mentioned "other member" is at least one of the inner wall portion 42 (see FIGS. 10A and 10B), the inner wall protruding portion 43 (see FIG. 8), and the bearing holder 5 (see FIG. 9). .

In this way, on the radially inner side of the substrate 6, it is possible to suppress the rotation of the substrate 6 in the direction from the first convex portion toward the part of the other member in the circumferential direction Dr.

Also, the other member described above has a second recess. The second recess is recessed in the direction from the one member to the other member and accommodates at least part of the first protrusion.

2 and 5 to 7B, when at least one of the inner wall portion 42, the inner wall protruding portion 43, and the bearing holder 5 is the above-described "one member", the above-described "second The "recess" is at least one of an inner recess 611 (see FIGS. 2 and 5), a recess 612 (see FIGS. 6A and 6B), and a recess 613 (see FIGS. 7A and 7B).

On the other hand, as shown in FIGS. 8 to 10B, when the substrate 6 is the above-described “one member”, the above-described “first convex portion” includes a concave portion 423 (see FIGS. 10A and 10B) and a concave portion 433 (see FIGS. 10A and 10B). 8), and at least one of recesses 522 (see FIG. 9).

In this way, at least a portion of the first protrusion is accommodated in the second recess, so that the rotation of the substrate 6 in the circumferential direction Dr can be suppressed or prevented on the radially inner side of the substrate 6 .

<1-9. Rotation Suppressing Structure of Substrate 6 at Radial Direction Outer End>
Next, with reference to FIGS. 11A to 14B, an embodiment of the rotation suppressing structure of the substrate 6 at the radially outer end portion and its first to third modifications will be described. FIG. 11A is a vertical cross-sectional view showing an example of a rotation suppressing structure for the substrate 6 at the radially outer end portion. FIG. 11B is a cross-sectional view showing an embodiment of the rotation restraint structure for the substrate 6 at the radially outer end. FIG. 12A is a vertical cross-sectional view showing a first modification of the rotation suppressing structure of the substrate 6 at the radially outer end portion. FIG. 12B is a vertical cross-sectional view showing a first modification of the rotation suppressing structure of the substrate 6 at the radially outer end portion. FIG. 13A is a vertical cross-sectional view showing a second modification of the rotation suppressing structure of the substrate 6 at the radially outer end portion. FIG. 13B is a vertical cross-sectional view showing a second modification of the rotation suppressing structure of the substrate 6 at the radially outer end portion. FIG. 14A is a vertical cross-sectional view showing a third modification of the rotation suppressing structure of the substrate 6 at the radially outer end portion. FIG. 14B is a vertical cross-sectional view showing a third modification of the rotation suppressing structure of the substrate 6 at the radially outer end portion. 11A, 12A, 13A, and 14A correspond to the portion XIA surrounded by the dashed line in FIG. FIG. 11B is a cross-section of part XIA of FIG. 1 taken along an imaginary plane including the dashed-dotted line GG of FIG. 11A and perpendicular to the axial direction, corresponding to part XIB enclosed by the dashed line in FIG. FIG. 12B is a cross-section of part XIA of FIG. 1 taken along an imaginary plane including the dashed line HH of FIG. 12A and perpendicular to the axial direction, corresponding to part XIB enclosed by the dashed line in FIG. FIG. 13B is a cross-section of part XIA of FIG. 1 taken along an imaginary plane including the dashed-dotted line II of FIG. 13A and perpendicular to the axial direction, corresponding to part XIB enclosed by the dashed line in FIG. 14B is a cross-section of part XIA of FIG. 1 taken along an imaginary plane that includes the dashed-dotted line JJ of FIG. 14A and is perpendicular to the axial direction, and corresponds to part XIB surrounded by dashed lines in FIG.

Note that in the first to third modifications, configurations different from those of the embodiment will be described. Moreover, the same reference numerals are given to the same components as those of the embodiment of FIGS. 11A and 11B, and the description thereof may be omitted.

<1-9-1. Example>
As shown in FIGS. 11A and 11B, the substrate 6 has an outer projection 621. As shown in FIGS. In addition, the outer convex portion 621 is an example of the "second convex portion" of the present invention in the embodiment. The outer convex portion 621 protrudes radially outward on the radially outward side of the substrate 6 . In FIGS. 11A and 11B, the outer convex portion 621 protrudes from the substrate 6 toward the cover portion 31 (for example, radially outward) and faces a part of the cover portion 31 in the circumferential direction Dr. With this facing structure, on the radially outer side of the substrate 6, rotation of the substrate 6 in the direction from the outer convex portion 621 toward the part of the cover portion 31 in the circumferential direction Dr can be suppressed.

Specifically, the cover portion 31 has a recess 313 . The concave portion 313 is an example of the "third concave portion" of the present invention in the embodiment. The recessed portion 313 is arranged at one axial end portion of the cover portion 31 and is recessed in the other axial direction D2. 11A and 11B, the recess 313 is a notch formed in one axial end of the cover portion 31 (for example, the projecting wall portion 312). The recessed portion 313 penetrates the cover portion 31 (for example, the projecting wall portion 312) in the radial direction, and further penetrates the projecting wall portion 312 in the axial direction (see, for example, FIG. 3). 3 and FIGS. 11A to 11B, the concave portion 313 does not have to penetrate the cover portion 31 in the radial direction. For example, the recessed portion 313 may be arranged on the radially inner side surface of the one axial end portion of the cover portion 31 and may be recessed radially outward.

11A and 11B, the recess 313 is recessed in a direction (for example, the other axial direction D2) from the outer protrusion 621 of the substrate 6 toward the cover portion 31, and accommodates at least part of the outer protrusion 621. In FIG. The inner surface of the concave portion 313 facing one circumferential direction faces the other circumferential end surface of the outer convex portion 621 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, the inner surface of the concave portion 313 facing the other circumferential direction faces the one circumferential end surface of the outer convex portion 621 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially outer side of the substrate 6 .

<1-9-2. First modification>
Further, as shown in FIGS. 12A and 12B, the outer convex portion 621 may face a portion of the outer wall portion 44 in the circumferential direction Dr. In addition, the outer convex portion 621 is an example of the "second convex portion" of the present invention in the first modification. 12A and 12B, the outer protrusion 621 protrudes from the substrate 6 toward the outer wall portion 44 (for example, radially outward) and faces a portion of the outer wall portion 44 in the circumferential direction Dr. With this facing structure, on the radially outer side of the substrate 6, rotation of the substrate 6 in the direction from the outer convex portion 621 toward the part of the outer wall portion 44 in the circumferential direction Dr can be suppressed.

Specifically, the outer wall portion 44 has a recess 441 . The concave portion 441 is an example of the "third concave portion" of the present invention in the first modified example. The recessed portion 441 is arranged on the radial inner surface of the other axial end portion of the outer wall portion 44 and is recessed radially inward. At this time, the recessed portion 441 may penetrate the outer wall portion 44 in the radial direction. Doesn't have to go through. 12A and 12B, the recessed portion 441 is further recessed in the one axial direction D1 at the other axial end portion of the outer wall portion 44 .

The recessed portion 441 is recessed in a direction (for example, one axial direction D1) from the substrate 6 toward the outer wall portion 44 and accommodates at least part of the outer projecting portion 621 . The inner surface of the concave portion 441 facing one circumferential direction faces the other circumferential end surface of the outer convex portion 621 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, the inner surface facing the other circumferential direction of the concave portion 441 faces the one circumferential direction end surface of the outer convex portion 621 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially outer side of the substrate 6 .

<1-9-3. Second modification>
Alternatively, as shown in FIGS. 13A and 13B, the cover portion 31 may have a convex portion 314. FIG. In addition, the convex portion 314 is an example of the “second convex portion” of the present invention in the second modified example. 13A and 13B, the convex portion 314 protrudes from the cover portion 31 toward the substrate 6. In FIGS. For example, the convex portion 314 protrudes radially inward from the radial inner surface of the projecting wall portion 312 . The convex portion 314 faces a portion of the substrate 6 in the circumferential direction Dr. With this facing structure, it is possible to suppress the rotation of the substrate 6 in the direction from the convex portion 314 toward the part of the substrate 6 in the circumferential direction Dr on the radially outer side of the substrate 6 .

Specifically, the substrate 6 has an outer recess 622 . It should be noted that the outer recessed portion 622 is an example of the "third recessed portion" of the present invention in the second modified example. The outer recess 622 is arranged at the radially outer end of the substrate 6 and is recessed radially inward. 13A and 13B, the outer concave portion 622 is concave in the direction from the cover portion 31 toward the substrate 6 and accommodates at least part of the convex portion 314. In FIGS. The inner surface of the outer concave portion 622 facing one circumferential direction faces the other circumferential end surface of the convex portion 314 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, the inner surface facing the other circumferential direction of the outer concave portion 622 faces the one circumferential direction end surface of the convex portion 314 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially outer side of the substrate 6 .

<1-9-4. Third modification>
Also, as shown in FIGS. 14A and 14B, the outer wall portion 44 may have a convex portion 442 . It should be noted that the convex portion 442 is an example of the "second convex portion" of the present invention in the third modified example. 14A and 14B, the convex portion 442 protrudes from the outer wall portion 44 in the direction toward the substrate 6. In FIGS. For example, the convex portion 314 protrudes from the other axial end portion of the projecting wall portion 312 in the other axial direction D2. The convex portion 442 faces a portion of the substrate 6 in the circumferential direction Dr. With this facing structure, it is possible to suppress the rotation of the substrate 6 in the direction from the protrusion 442 toward the part of the substrate 6 in the circumferential direction Dr on the radially outer side of the substrate 6 .

Specifically, at least a portion of the protrusion 442 is accommodated in the outer recess 622 . It should be noted that the outer recessed portion 622 is an example of the "third recessed portion" of the present invention in the third modified example. 14A and 14B, the outer recessed portion 622 is recessed in a direction from the outer wall portion 44 toward the substrate 6 (for example, radially inward). The inner surface of the outer concave portion 622 facing one circumferential direction faces the other circumferential end surface of the convex portion 442 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. In addition, the inner surface facing the other circumferential direction of the outer concave portion 622 faces the one circumferential direction end surface of the convex portion 442 in the circumferential direction Dr. At this time, both may face each other with a gap therebetween, or may be in contact with each other. By doing so, it is possible to suppress or prevent the rotation of the substrate 6 in the circumferential direction Dr on the radially outer side of the substrate 6 .

<1-9-5. Summary>
Regarding the rotation suppressing structure of the substrate 6 at the radially outer end portion, the above-described embodiment and its first to third modifications may be employed as a single configuration. Moreover, the structure which combined at least 2 of these may be employ|adopted.

According to the above-described embodiment and its first to third modifications, at least one of the cover portion 31 and the outer wall portion 44 and at least one of the substrate 6 has the second convex portion. have. The second convex portion protrudes in a direction from the one member mentioned above toward the other member, and faces a part of the other member mentioned above in the circumferential direction Dr.

11A to 11B and FIGS. 12A to 12B, when the substrate 6 is the above-described “one member”, the above-described “second convex portion” is the outer convex portion 621 . Moreover, the above-mentioned "other member" is at least one of the cover portion 31 (see FIGS. 11A and 11B) and the outer wall portion 44 (see FIGS. 12A and 12B).

On the other hand, as shown in FIGS. 13A to 13B and FIGS. 14A to 14B, when at least one of the cover portion 31 and the outer wall portion 44 is the above-described “one member”, the above-described “second convex portion” is , protrusion 314 (see FIGS. 13A and 13B) and protrusion 442 (see FIGS. 14A and 14B). The “other member” mentioned above is the substrate 6 .

In this way, on the radially outer side of the substrate 6, it is possible to suppress the rotation of the substrate 6 in the direction from the second convex portion toward the part of the other member in the circumferential direction Dr.

Also, the other member described above has a third recess. The third recess is recessed in a direction from the one member mentioned above toward the other member mentioned above, and accommodates at least part of the second protrusion.

11A to 11B and FIGS. 12A to 12B, when the substrate 6 is the above-described "one member", the above-described "third recess" is the recess 313 (see FIGS. 11A and 11B). and at least one of recesses 441 (see FIGS. 12A and 12B).

On the other hand, as shown in FIGS. 13A to 13B and FIGS. 14A to 14B, when at least one of the cover portion 31 and the outer wall portion 44 is the above-described "one member", the above-described "third recess" Outer recess 622 .

In this way, at least part of the second protrusion is accommodated in the third recess, so that the rotation of the substrate 6 in the circumferential direction Dr can be suppressed or prevented on the radially outer side of the substrate 6 .

<2. Modification of Embodiment>
Next, configurations of the first and second modifications of the embodiment, which are different from those of the above-described embodiment, will be described. Moreover, the same code|symbol may be attached|subjected to the component similar to the above-mentioned embodiment, and the description may be abbreviate|omitted. Moreover, the above-described embodiment, the first modified example, and the second modified example can be combined without any particular contradiction.

<2-1. First modification>
FIG. 15 is a longitudinal sectional view showing a configuration example of the motor 100 according to the first modified example. In the first modified example of the embodiment, the substrate 6 has a first ground portion 631 and a second ground portion 632 . The first ground portion 631 and the second ground portion 632 are, for example, ground electrodes formed on the substrate 6 and electrically connected to wiring patterns (not shown) of the substrate 6 . Each of the first ground portion 631 and the second ground portion 632 may be a metal foil such as copper attached to the substrate 6, or may be a metal plating layer.

The first ground portion 631 is electrically connected to the housing 4 . The housing 4 is made of metal such as zinc, for example. The first ground portion 631 is arranged on one axial end surface of the substrate 6 at the radially inner end portion of the substrate 6 . The first ground portion 631 axially faces the other axial end surface of the inner wall portion 42 .

The second ground portion 632 is arranged on the other axial end surface of the substrate 6 and electrically connected to the bearing holder 5 . The bearing holder 5 is made of metal such as brass, for example. The second ground portion 632 is arranged on the other axial end surface of the substrate 6 at the radially inner end portion of the substrate 6 . The second ground portion 632 axially faces the surface of the bearing holder 5 facing the one axial direction D1.

The radially inner end portion of the substrate 6 is sandwiched between the other axial end surface of the inner wall portion 42 and the surface of the bearing holder 5 (for example, the holder base portion 532) facing the one axial direction D1. At this time, the first ground portion 631 and the second ground portion 632 are arranged in the holding portion described above.

Note that in FIG. 15 , the motor 100 further includes a first conductive member 71 and a second conductive member 72 .

The first conductive member 71 is, for example, a carbon sheet, and is arranged between the other axial end surface of the inner wall portion 42 and the first ground portion 631 . That is, in FIG. 15 , the first ground portion 631 indirectly contacts the other axial end surface of the inner wall portion 42 via the first conductive member 71 . By disposing the first conductive member 71, the electrical connection between the first ground portion 631 and the housing 4 (the inner wall portion 42 in FIG. 15) can be made more reliable. In addition, the interposition of the first conductive member 71 can sufficiently secure the contact pressure of the inner wall portion 42 of the housing 4 against the radially inner end portion of the substrate 6 . Therefore, the radially inner end portion of the substrate 6 can be more reliably fixed between the housing 4 (the inner wall portion 42 in FIG. 15) and the bearing holder 5 (the holder base portion 532 in FIG. 15). However, the first ground portion 631 may be in direct contact with the other axial end surface of the inner wall portion 42 without being limited to the example shown in FIG. 15 .

The second conductive member 72 is, for example, a carbon sheet, and is arranged between the surface of the bearing holder 5 facing the one axial direction D1 and the second ground portion 632 . That is, in FIG. 15, the second ground portion 632 indirectly contacts the surface of the bearing holder 5 (the holder base portion 532 in FIG. 15) facing the one axial direction D1 through the second conductive member 72 . By disposing the second conductive member 72, the electrical connection between the second ground portion 632 and the bearing holder 5 (the holder base portion 532 in FIG. 15) can be made more reliable. In addition, the interposition of the second conductive member 72 can sufficiently secure the contact pressure of the bearing holder 5 (the holder base portion 532 in FIG. 15) against the radially inner end portion of the substrate 6 . Therefore, the radially inner end portion of the substrate 6 can be more reliably fixed between the housing 4 (the inner wall portion 42 in FIG. 15) and the bearing holder 5 (the holder base portion 532 in FIG. 15). However, the second ground portion 632 is not limited to the example shown in FIG. 15, and the second ground portion 632 may be in direct contact with the surface of the bearing holder 5 (the holder base portion 532 in FIG. 15) facing the one axial direction D1.

Also, in FIG. 15, the substrate 6 has both the first ground portion 631 and the second ground portion 632 . However, the substrate 6 is not limited to this example, and either the first ground portion 631 or the second ground portion 632 may be omitted. In other words, the substrate 6 should have at least one of the first ground portion 631 and the second ground portion 632 . In this way, by clamping the radially inner end of the substrate 6, the substrate 6 can be grounded to at least one of the housing 4 and the bearing holder 5 without disposing a separate grounding member. Therefore, it is possible to prevent an increase in the number of parts of the motor 100 and, for example, the step of attaching the grounding member described above. Therefore, productivity of the motor 100 is improved.

Further, in FIG. 15 , the radially outer end of the substrate 6 is not sandwiched between a portion of the outer wall portion 44 and a portion of the cover portion 31 . Thereby, the fixing structure of the board|substrate 6 can be made simpler. Further, the motor 100 does not have a structure for suppressing rotation of the substrate 6 (see FIGS. 11A to 14B, etc.) at the radially outer end. For example, the radially outer end portion of the substrate 6 is arranged radially inwardly of the radially inner side surface of the cover tubular portion 311 . However, the illustration in FIG. 15 is a configuration in which the radially outer end portion of the substrate 6 is sandwiched between a portion of the outer wall portion 44 and a portion of the cover portion 31 in the first modification, and the radially outer end portion does not exclude the configuration in which the rotation suppressing structure of the board 6 (see FIGS. 11A to 14B, etc.) is arranged in the motor 100 .

<2-2. Second modification>
FIG. 16 is a longitudinal sectional view showing a configuration example of a motor 100 according to a second modified example of the embodiment. In the second modified example of the embodiment, the housing 4 is provided with a base projecting portion 45, which will be described later. A holder concave portion 55 , which will be described later, is arranged in the bearing holder 5 . The base projecting portion 45 projects from the base portion 41 in the other axial direction D<b>2 and fits into the holder recessed portion 55 . In this way, the base protrusion 45 can be fixed to the bearing holder 5 by fitting the base protrusion 45 and the holder recess 55 . Therefore, the bearing holder 5 can be fixed to the housing 4 .

Specifically, the housing 4 has a base protrusion 45 instead of the base recess 411 . The base projecting portion 45 is another example of the “first projecting portion” of the present invention, and fits into the holder recessed portion 55 of the bearing holder 5 . The base protruding portion 45 is arranged on one side D1 in the axial direction from the first holder portion 51 and protrudes from the housing 4 toward the bearing holder 5 in the axial direction. In the second modification of the embodiment, the base projecting portion 45 projects from the base portion 41 in the other axial direction D2. The radially outer end of the base projecting portion 45 is arranged radially inward of the radially outer end of the first holder portion 51 . Further, the radially inner end portion of the substrate 6 is arranged radially outward from at least part of the base projecting portion 45 .

The base protrusion 45 is fixed to the bearing holder 5 . For example, the bearing holder 5 can be fixed to the housing 4 by fitting the base protrusion 45 into the holder recess 55 .

The inner wall portion 42 of the housing 4 extends axially from the base portion 41 and is arranged at the radially outer end portion of the base projecting portion 45 . As mentioned above, the housing 4 further has an inner wall portion 42 . The inner wall portion 42 extends in the circumferential direction Dr and surrounds the base projecting portion 45 . In the second modified example of the embodiment, the inner wall portion 42 has a tubular shape extending in the axial direction. In this way, the connecting portion between the base portion 41 and the base projecting portion 45 can be reinforced by the inner wall portion 42 .

The inner wall projecting portion 43 of the housing 4 projects from the other axial end portion of the inner wall portion 42 toward the other axial direction D<b>2 and is arranged at the radially outer end portion of the base projecting portion 45 . The inner wall protrusion 43 extends in the circumferential direction Dr and surrounds the base protrusion 45 . In the second modified example of the embodiment, the inner wall protrusion 43 has a tubular shape extending in the axial direction.

Note that the base protrusion 45 is integrated with the base 41, the inner wall 42, and the inner wall protrusion 43 in the second modification of the embodiment. However, the present invention is not limited to this example, and the base protruding portion 45 may be separate from at least one of the base portion 41 , the inner wall portion 42 , and the inner wall protruding portion 43 .

Next, the bearing holder 5 has holder recesses 55 instead of the holder projections 52 . The holder recessed portion 55 is another example of the “first recessed portion” of the present invention, and is recessed from the bearing holder 5 toward the housing 4 in the axial direction. In a second modification of the embodiment, the holder recessed portion 55 is arranged in the second holder portion 53 . The holder recessed portion 55 is an internal space of the second holder portion 53, and is recessed from the other axial end portion of the second holder portion 53 in the one axial direction D1.

In FIG. 16 , the holder recessed portion 55 is a through hole extending in the axial direction and penetrates the second holder portion 53 in the axial direction. For example, the holder recessed portion 55 axially penetrates the holder bottom portion 531 and the holder base portion 532 . In other words, in FIG. 16, the second holder portion 53 is annular. The holder concave portion 55 is connected to the radially inner side (that is, the internal space) of the first holder portion 51 . In this way, contaminants can be discharged from the inner space of the first holder portion 51 to the outside through the holder recessed portion 55 . For example, when attaching the shaft 10 to the bearing holder 5 , depending on the tolerance of the inner diameter of the bearing 511 , the radially outer end of the shaft 10 may be ground. At this time, polishing dust is generated between the shaft 10 and the bearing 511 . Even if contaminants such as polishing dust are generated, they can be discharged to the outside of the bearing holder 5 from the holder concave portion 55 . Therefore, when the motor 100 is driven, foreign matters can be prevented from entering the bearing 511 and scattering from the inside of the bearing holder 5 into the internal space of the motor 100 and others. Therefore, the influence of contaminants on driving the motor 100 can be prevented.

However, the illustration in FIG. 16 does not exclude the configuration in which the holder recessed portion 55 does not penetrate the second holder portion 53 . For example, the holder recessed portion 55 may be recessed from the one axial end portion of the second holder portion 53 toward the other axial direction D2. Further, the other axial end of the holder recess 55 does not have to reach the other axial end of the second holder 53, and is located on the one axial side D1 from the other axial end of the second holder 53. may

<3. Others>
The embodiment, the first modified example, and the second modified example of the present invention have been described above. It should be noted that the scope of the present invention is not limited to the above-described embodiments. The present invention can be practiced by adding various modifications to the above-described embodiment, first modified example, and second modified example without departing from the gist of the invention. Further, the matters described in the above-described embodiment, first modified example, and second modified example can be appropriately and arbitrarily combined as long as there is no contradiction.

INDUSTRIAL APPLICABILITY The present invention is useful for devices in which a substrate is housed inside a cover portion together with a rotor and a stator.

DESCRIPTION OF SYMBOLS 100... Motor, 500... Composite machine, 1... Rotor, 10... Shaft, 11... Magnet, 12... Rotor cover, 13... Rotor cylindrical part, 2... Stator, 21... Stator core, 22... Coil part, 31... Cover part, 311... Cover cylindrical part, 312... Protruding wall part, 313... Concave part, 314... Protruding part Part 32 Lid portion 321 Lid cylinder portion 322 Bearing 4 Housing 41 Base portion 411 Base concave portion 42 Inner wall portion 421 pedestal portion 422 convex portion 423 concave portion 43 inner wall protrusion portion 431 convex portion 432 through hole 433 concave portion 44. Outer wall portion 441 Concave portion 442 Convex portion 45 Base projection portion 5 Bearing holder 51 First holder portion 511 Bearing 52 521: Convex portion 522: Concave portion 53: Second holder portion 531: Holder bottom portion 532: Holder base portion 533: Convex portion 54... Pedestal part 55... Holder concave part 6... Substrate 611... Inner concave part 612, 613... Concave part 614... Inner convex part 621... Outer convex part , 622... Outer concave portion 631... First ground portion 632... Second ground portion 71... First conductive member 72... Second conductive member CA... Central axis

Claims (22)

a rotor having a shaft rotatable about an axially extending central axis and magnets;
a stator radially facing the magnet;
a housing arranged on one side in the axial direction from the stator;
a bearing holder that is separate from the housing and rotatably supports the shaft via a bearing;
a radially extending substrate;
with
The bearing holder has a first holder portion radially facing the bearing,
one component of the housing and the bearing holder has a first recess recessed axially from the other component toward the one component;
The other constituent portion is arranged on one side in the axial direction of the first holder portion, and protrudes from the other constituent portion toward the one constituent portion in the axial direction to fit into the first concave portion. has
a radially outer end portion of the first projecting portion is arranged radially inwardly of a radially outer end portion of the first holder portion;
A radially inner end portion of the substrate is arranged radially outward of at least a portion of the first projection portion and is arranged at a position axially overlapping with at least a portion of the first holder portion. ,motor. The first recess is arranged in the bearing holder, and the first protrusion is arranged in the housing,
The housing has a base portion that extends in a direction that intersects with the axial direction,
2. The motor according to claim 1, wherein said first projecting portion projects in the other axial direction from said base portion. 3. The motor according to claim 2, wherein the first concave portion is a through hole extending in the axial direction and is connected to the radially inner side of the first holder portion. the housing further has a tubular inner wall extending axially from the base;
4. The motor according to claim 2 or 3, wherein the inner wall portion is arranged at a radially outer end portion of the first protrusion. The first recess is arranged in the housing, and the first protrusion is arranged in the bearing holder,
The housing is
a base portion extending in a direction intersecting with the axial direction;
a cylindrical inner wall extending axially from the radially inner end of the base;
has
The first recess includes an internal space of the tubular inner wall,
2. The motor of claim 1, wherein the first protrusion is fixed to the inner wall. 6. The motor according to claim 4, wherein the one axial end face of the substrate faces the other axial end face of the inner wall portion in the axial direction. At the radially inner end of the substrate,
one axial end surface of the substrate is in contact with the other axial end surface of the inner wall,
7. The motor according to claim 6, wherein the other axial end surface of the substrate is in contact with the surface of the bearing holder facing the one axial direction. The inner wall portion has a first pedestal portion projecting radially outward at the other axial end portion of the inner wall portion,
8. The motor according to claim 7, wherein the one axial end face of said substrate is further in contact with the other axial end face of said first pedestal. The substrate is
a first ground portion electrically connected to the housing;
a second ground portion disposed on the other axial end surface of the substrate and electrically connected to the bearing holder;
have at least one of
the first ground portion is disposed on one axial end face of the substrate at a radially inner end portion of the substrate and faces the other axial end face of the inner wall portion in the axial direction;
8. The second ground portion is disposed on the other axial end surface of the substrate at the radially inner end portion of the substrate, and axially faces a surface of the bearing holder facing one direction in the axial direction. 9. The motor according to Item 8. The housing has a second projecting portion projecting in the other axial direction from the other axial end portion of the inner wall portion,
10. The motor according to any one of claims 4 to 9, wherein the radially inner end portion of the substrate is arranged to radially face the radially outer surface of the second protrusion. At least one of the inner wall portion, the second projecting portion, and the bearing holder, and one member of the substrate have a first projection projecting in a direction from the one member toward the other member. has a part
11. The motor according to claim 10, wherein said first protrusion faces a part of said other member in the circumferential direction. 12. The motor according to claim 11, wherein said other member has a second recess that is recessed in a direction from said one member toward said other member and that accommodates at least part of said first protrusion. The bearing holder further has a second holder portion arranged at one end in the axial direction of the first holder portion,
The second holder part has a holder base part,
The radially outer end portion of the holder base portion is arranged radially inwardly of the radially outer end portion of the first holder portion and radially outwardly of the radially outer end portion of the first projecting portion. placed and
13. The motor according to any one of claims 1 to 12, wherein the radial inner end portion of the substrate axially faces the one axial end surface of the holder base portion. At the radially inner end of the substrate,
the other axial end surface of the substrate is in contact with the one axial end surface of the holder base,
14. The motor according to claim 13, wherein the one axial end surface of the substrate is in contact with at least a portion of the surface of the housing facing the other axial direction. The bearing holder further has a second pedestal portion projecting radially outward from a radially outer end portion of the bearing holder,
15. The motor according to any one of claims 1 to 14, wherein the second axial end surface of the second seat portion is in contact with the stator in the axial direction. 16. The motor according to any one of claims 1 to 15, further comprising a tubular cover portion extending axially in the other axial direction from a radially outer end of the housing and accommodating the rotor and the stator. The housing further has an outer wall portion that protrudes in the other axial direction from the radially outer end portion of the housing and extends in the circumferential direction,
At the radially outer end of the substrate,
one axial end surface of the substrate axially faces a portion of the outer wall;
17. The motor according to claim 16, wherein the other axial end face of the substrate axially faces a portion of the cover portion. At the radially outer end of the substrate,
one axial end surface of the substrate is in contact with a portion of the outer wall,
18. The motor according to claim 17, wherein the other axial end face of the substrate is in contact with a portion of the cover portion. at least one of the cover portion and the outer wall portion and one of the substrate has a second protrusion projecting in a direction from the one member toward the other member;
19. The motor according to claim 17, wherein said second protrusion faces a portion of said other member in the circumferential direction. 20. The motor according to claim 19, wherein said other member has a third recess that is recessed in a direction from said one member toward said other member and that accommodates at least part of said second protrusion. 21. A motor according to any preceding claim, wherein the substrate is annular surrounding the central axis. An electronic device comprising the motor according to any one of claims 1 to 21.

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