JP2013039011A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover member that lowers the necessary rigidity in order to solve the problem that when bearing members are attached to a cover member, a large load is exerted on the cover member, thus becoming necessary to enhance the rigidity of the cover member.SOLUTION: A motor 1 includes: a stator 32 fixed to an outer peripheral surface of a bush 31; a lidded substantially cylindrical rotor holder 221 fixed to a shaft 21l; an attachment plate 13; and a cover member 12. The attachment plate 13 is made of metal, has a planar shape extending outward in a radial direction from a lower end of the bush 31, and includes an attachment part 131 which is used for attachment to an attachment object. The cover member 12 is made of metal, and has a lidded substantially cylindrical shape for covering the rotor holder 221. A lower end of a cylindrical part of the cover member 12 is attached to the attachment plate 13. The cover member 12 includes a cylindrical bearing holding part 123 around a central axis at a middle part of a lid part. One bearing member 15 is fixed to an inner peripheral surface of the bearing holding part 123, and the other bearing member 16 is fixed to an inner peripheral surface of the bush 31.

Description

  The present invention relates to an electric motor.

  Conventionally, in home appliances such as an air cleaner and a ventilation fan, an inner rotor type motor is used as a drive source. A motor mounted on a home appliance needs a simple dustproof structure. In order to prevent dust and the like from entering the motor, for example, in an AC (Alternating Current) motor, the entire motor is resin-molded, and in a DC (Direct Current) motor, a cover member that covers the motor is attached.

As an outer rotor type motor, for example, there is one disclosed in JP-A-7-163115. The motor includes a rotor, a stator, a shaft, first and second bearings, first and second housings, and a preload spring. The rotor is fixed to the shaft. A cylindrical mounting recess is provided in the center of the first housing by double drawing. A preload spring for pressing the first bearing and the first bearing is disposed in the mounting recess. The stator support cylinder is fitted and fixed to the outer periphery of the mounting recess, and the stator is press-fitted into the stator support cylinder. The second housing is formed by drawing a steel plate into a bottomed cylindrical shape, and an attachment recess is formed at the center. The second bearing is fitted in the mounting recess of the second housing. The shaft is inserted into the first and second bearings and is rotatably supported by the first and second bearings.
JP-A-7-163115

  Incidentally, as disclosed in Japanese Patent Laid-Open No. 7-163115, some motors are provided with a cover member that covers a rotating portion in order to prevent dust from entering the motor. If a bearing member is to be attached to the cover member, a large load is applied to the cover member, so that it is necessary to increase the rigidity of the cover member.

  The main object of the present invention is to reduce the rigidity required for the cover member.

  A motor according to an exemplary aspect of the present invention is fixed to a bearing, a shaft supported by the bearing so as to be rotatable about a central axis facing in the vertical direction, a bush, and an outer peripheral surface of the bush. A stator, a lid-shaped substantially cylindrical rotor holder fixed to the shaft, a rotor magnet fixed to an inner peripheral surface of a cylindrical portion of the rotor holder, and positioned radially outside the stator; and a metal, It is a plate shape spreading radially outward from the lower end of the bush, an attachment plate having an attachment portion used for attachment to an attachment target, and a substantially cylindrical shape with a lid that is formed of metal and covers the rotor holder. A cover member fixed to the mounting plate at a lower end of the tube portion, and the cover member includes a cylindrical bearing holding portion centered on the central axis at the center of the lid portion, and the bearing Two bearing members comprises a one bearing member is fixed to the inner peripheral surface of the bearing holder and the other bearing member, it is fixed to the inner peripheral surface of the bush.

  According to the present invention, the rigidity required for the cover member can be reduced.

FIG. 1 is a front view showing a motor according to the first embodiment. FIG. 2 is a sectional view of the motor. FIG. 3 is a cross-sectional view showing the vicinity of the upper bearing member. FIG. 4 is a cross-sectional view showing the vicinity of the lower bearing member. FIG. 5 is an exploded perspective view of the motor. FIG. 6 is a cross-sectional view of the vicinity of an upper bearing member of a motor according to another example. FIG. 7 is a cross-sectional view of the vicinity of an upper bearing member of a motor according to still another example. FIG. 8 is a perspective view of a motor according to still another example. FIG. 9 is a view showing another example of the upper bearing member. FIG. 10 is a diagram illustrating another example of the lower bearing member.

  In the present specification, the upper side of FIG. 1 in the direction of the central axis of the motor is simply referred to as “upper side”, and the lower side is simply referred to as “lower side”. Note that the vertical direction does not indicate the positional relationship or direction when incorporated in an actual device. A direction parallel to the central axis is referred to as an “axial direction”, a radial direction centered on the central axis is simply referred to as “radial direction”, and a circumferential direction centered on the central axis is simply referred to as “circumferential direction”.

(First embodiment)
FIG. 1 is a front view of a motor 1 according to a first exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view of the motor 1. The motor 1 is an outer rotor type, and is used as a drive source for home appliances such as an air purifier, a fan, and a ventilation fan. The motor 1 includes a motor unit 11 illustrated in FIG. 2, a cover member 12, and a mounting plate 13. The motor unit 11 includes a rotating unit 111, a stationary unit 112, and two bearing members 15 and 16 that are ball bearings. Hereinafter, the bearing member 15 positioned on the upper side of the motor 1 is referred to as an “upper bearing member 15”. The bearing member 16 located on the lower side is referred to as a “lower bearing member 16”. The rotating part 111 rotates around a central axis J1 that faces the stationary part 112 in the vertical direction.

  The rotating unit 111 includes a shaft 21, a rotor holder 22, and a rotor magnet 23. The rotor holder 22 has a substantially cylindrical shape with a lid, and is formed by pressing a thin plate. The shaft 21 is fixed to the hole provided in the center of the lid 221 of the rotor holder 22. The rotor magnet 23 is fixed to the inner peripheral surface of the cylindrical portion 222 of the rotor holder 22. The rotor magnet 23 may be cylindrical, or a plurality of magnets arranged in the circumferential direction.

  The stationary portion 112 includes a bush 31, a stator 32, a circuit board 33, and a wave washer 17 that is a preload member. The bush 31 is substantially cylindrical with the central axis J1 as the center. The lower bearing member 16 and the wave washer 17 are held inside the bush 31.

  The stator 32 includes a stator core 321 and a coil 322. The stator core 321 has an annular shape centered on the central axis J1, and is formed by stacking a plurality of thin magnetic steel plates in the vertical direction. A radially inner portion of the stator core 321 is fixed to the outer peripheral surface of the bush 31. The stator core 321 may be indirectly fixed to the bush 31. The coil 322 is formed by winding a conducting wire around the stator core 321. The rotor magnet 23 is located outside the stator 32 in the radial direction, and torque is generated between the stator 32 and the rotor magnet 23.

  In the motor 1, the upper part and the center part of the shaft 21 are inserted into the upper bearing member 15 and the lower bearing member 16, respectively, and supported so as to be rotatable about the central axis J1. A lower portion 211 of the shaft 21 that is an end portion on the output side protrudes downward from the mounting plate 13.

  The cover member 12 is molded from metal. The cover member 12 has a substantially cylindrical shape with a lid and covers the rotor holder 22. The cover member 12 includes a cylindrical part 121 and a lid part 122. The cylindrical portion 121 extends downward from the outer edge portion of the lid portion 122. In the motor 1, the lower end 121 a of the cylindrical portion 121 of the cover member 12 is fixed to the mounting plate 13, thereby preventing dust and the like from entering the motor 1. The lid part 122 includes a bearing holding part 123 and a plurality of mounting holes 127. The bearing holding portion 123 is located in the center of the lid portion 122 and has a cylindrical shape with the central axis J1 as the center. As will be described later, the motor 1 is attached to the attachment target of the device using the attachment plate 13, but the cover member 12 may be attached to the attachment target instead of the attachment plate 13 by inserting a screw into the attachment hole 127. Is possible.

  FIG. 3 is an enlarged view showing the vicinity of the bearing holding portion 123 of the motor 1. The bearing holding portion 123 protrudes below the lower surface of the lid portion 122. The tip end portion of the bearing holding portion 123, that is, the lower end portion in the axial direction, includes an annular extending portion 124 that extends radially inward. The upper bearing member 15 is held by the bearing holding portion 123. The outer ring 151 of the upper bearing member 15 is fixed to the inner peripheral surface of the bearing holding portion 123 with an adhesive. In the axial direction, the lower end portion of the outer ring 151 abuts on the extending portion 124. The inner ring 152 of the upper bearing member 15 is fixed to the upper part of the outer peripheral surface of the shaft 21 by press-fitting (or bonding). The upper part of the upper bearing member 15 projects upward from the bearing holding part 123. When the cover member 12 is attached to the attachment target, the upper bearing member 15 is inserted into the hole to be attached so that the cover member 12 can be positioned in a plane perpendicular to the central axis J1. it can.

  FIG. 4 is a cross-sectional view of the vicinity of the lower portion of the bush 31. In FIG. 4, the shape of the back side of the wave washer 17 is also shown. The same applies to FIG. 7 below. The inner peripheral surface of the bush 31 includes a stepped portion 312 that increases in diameter downward. The outer ring 161 of the lower bearing member 16 is fixed to the lower part of the inner peripheral surface of the bush 31 with an adhesive below the step portion 312. A wave washer 17 is located between the outer ring 161 and the stepped portion 312. The inner ring 162 is fixed to the outer peripheral surface of the shaft 21 by press-fitting (or bonding).

  In the motor 1, a downward force is applied to the outer ring 161 of the lower bearing member 16 by the wave washer 17. However, actually, since the bush 31 and the lower bearing member 16 are bonded, the same state as the fixed position preload is obtained. Thus, by applying a preload to the lower bearing member 16, the rigidity of the lower bearing member 16 can be ensured. Further, a preload toward the extending portion 124 is indirectly applied to the outer ring 151 of the upper bearing member 15 shown in FIG. Thereby, the rigidity of the upper bearing member 15 can be ensured.

  FIG. 5 is an exploded perspective view of the motor 1. The lower end portion 121a of the cylindrical portion 121 of the cover member 12 includes a flange portion 4 that extends radially outward. The flange portion 4 is provided with a plurality of cutout portions (hereinafter referred to as “flange cutout portions 44”). The flange notches 44 are provided at equal intervals in the circumferential direction. The cylindrical portion 121 is provided with a notched portion 43 (hereinafter referred to as a “notched portion 43”) that is recessed upward. In the axial direction, the notch 43 overlaps a portion 331 that protrudes radially outward of the circuit board 33 (hereinafter, referred to as “substrate protrusion 331”). In a state where the cover member 12 is attached to the motor unit 11, the board protruding part 331 protrudes radially outward from the notch part 43. The board protrusion 331 is provided with a connector (not shown) connected to an external power source. Actually, the notch 43 and the substrate protrusion 331 are covered with a cap (not shown).

  The mounting plate 13 is formed of metal. As shown in FIGS. 2 and 5, the mounting plate 13 has a disk shape that spreads radially outward from the lower end of the bush 31. The mounting plate 13 includes three mounting holes 131 and three bush fixing holes 132. In the motor 1, the thinnest portion of the portion to which the lower bearing member 16 of the bush 31 and the stator 32 are attached is the same thickness as the attachment plate 13 or thicker than the attachment plate 13. The bush 31 is formed by pressing, cutting, die casting, or the like, but cutting is preferable in order to ensure rigidity and shape accuracy.

  The three attachment holes 131 are provided in three portions 133 that protrude outward in the radial direction, and are arranged in the circumferential direction. The attachment plate 13 is attached to the attachment target by inserting screws into the attachment holes 131 and screw holes provided in the attachment target in devices such as home appliances. Thus, the attachment hole 131 plays a role as an attachment part used for attachment to an attachment target. The central part 134 of the mounting plate 13 protrudes stepwise upward. The bush fixing hole 132 is provided in the central portion 134. In the following description, a portion around the central portion 134 is referred to as “peripheral portion 135”.

  As shown in FIG. 5, the outer edge portion 13 a of the mounting plate 13 includes a plurality of protrusions 52 extending upward. Actually, in a state where the motor 1 is assembled, the protrusion 52 is bent radially inward as shown in FIG. In FIG. 1, the state before the protrusion 52 is bent is indicated by a two-dot chain line.

  In the motor 1, the boundary 6 between the flange portion 4 of the cover member 12 and the outer edge portion 13 a of the mounting plate 13 exists over substantially the entire circumference centering on the central axis J <b> 1. However, the position where the notch 43 of FIG. 5 is provided is excluded. At the boundary 6, the flange portion 4 and the mounting plate 13 are shaped along each other. Thereby, a clearance gap hardly arises in the boundary 6 and entry of dust etc. from the boundary 6 can be prevented or suppressed.

  When the motor 1 is assembled, first, the motor unit 11 shown in FIG. 5 is assembled. Next, the shaft 21 is passed through the hole in the central portion 134 of the mounting plate 13. When the screw 14 is inserted into the screw hole 311 and the bush fixing hole 132 provided at the lower end of the bush 31, the mounting plate 13 and the bush 31 are fixed. Since the lower surface of the central portion 134 is recessed upward, the head of the screw 14 is prevented from projecting downward from the lower surface of the peripheral portion 135.

  Next, the cover member 12 is attached to the attachment plate 13. At this time, as shown by a two-dot chain line in FIG. 1, the protruding portion 52 of the mounting plate 13 is located above the flange portion 4 via the flange cutout portion 44. The protruding portion 52 is bent onto the upper surface 45 of the flange portion 4, that is, plastically deformed, and comes into contact with the upper surface 45.

  In the motor 1, the cover member 12 and the mounting plate 13 are easily fixed by using a caulking structure constituted by the protruding portion 52 and the flange portion 4 as a fastening structure between the cover member 12 and the mounting plate 13. The

  As described above, the structure of the motor 1 according to the first embodiment has been described. In the motor 1, the highly rigid bush 31 to which the stator 32 is attached holds the lower bearing member 16 to add to the cover member 12. The load can be reduced. As a result, the rigidity required for the cover member 12 can be reduced. Since the bearing holding portion 123 of the cover member 12 is separated from the lower portion 211 that is the output side end portion of the shaft 21, the load applied to the cover member 12 can be further reduced. Since high rigidity is not required for the cover member 12, it is not necessary to firmly fix the cover member 12 and the mounting plate 13, and the fastening structure between the cover member 12 and the mounting plate 13 can be simplified. .

  The upper bearing member 15 and the lower bearing member 16 are held by the cover member 12 and the bush 31, respectively, so that an axial distance between the upper bearing member 15 and the lower bearing member 16, a so-called bearing span, is reduced. Can be secured. As a result, the deflection of the shaft 21 and the load applied to the upper bearing member 15 and the lower bearing member 16 are reduced. Since the bearing holding portion 123 extends downward from the lid portion 122, the height of the motor 1 can be suppressed while ensuring a bearing span. By disposing the wave washer 17 on the upper side of the lower bearing member 16, a bearing span can be secured by the thickness of the wave washer 17, and the shaft 21 is supported more stably. Since the lower bearing member 16 is held at the lower portion of the bush 31, a bearing span can be further secured.

  Compared to the case where the two bearing members are held by the bush 31, the shape of the bush 31 is prevented from becoming complicated. In the motor 1, the bearing holding portion of the upper bearing member 15 is provided on the lid portion 122 of the cover member 12 having a relatively space. As a result, it is easy to change the parts of the bush and the cover member when the size of the bearing member is changed. By providing the extending portion 124 in the bearing holding portion 123, the upper bearing member 15 can be easily positioned in the axial direction when the upper bearing member 15 is fixed to the bearing holding portion 123.

  FIG. 6 is a view showing another example of the cover member 12. The cover member 12 includes a bearing holding portion 125 that extends upward from the lid portion 122. The upper end portion in the axial direction, which is the tip portion of the bearing holding portion 125, includes an annular extending portion 126 that extends radially inward. In the axial direction, the upper end portion of the outer ring 151 of the upper bearing member 15 contacts the extending portion 126.

  When assembling the motor 1, first, the inner ring 162 of the lower bearing member 16 shown in FIG. 4 is press-fitted into the shaft 21. Next, with the wave washer 17 held in the bush 31, the shaft 21 is inserted into the bush 31 from below, and the outer ring 161 is fixed to the inner peripheral surface of the bush 31 with an adhesive. On the other hand, the outer ring 151 of the upper bearing member 15 is fixed to the inner peripheral surface of the bearing holding portion 123 shown in FIG. 6 with an adhesive.

  Similar to FIG. 2, after the stator 32 and the mounting plate 13 are fixed to the bush 31, the upper portion of the shaft 21 is press-fitted into the inner ring 152 of the upper bearing member 15 as shown in FIG. 6. As a result, an upward force is applied to the upper bearing member 15, and the outer ring 151 of the upper bearing member 15 and the extending portion 126 strongly contact each other in the axial direction. As a result, the rigidity of the upper bearing member 15 can be improved. Thereafter, as shown in FIG. 1, the cover member 12 and the mounting plate 13 are fixed.

  In the motor 1, the bearing holding portion 125 extending upward is provided, so that a bearing span can be further secured and the shaft 21 is supported more stably. By providing the extending portion 126 in the bearing holding portion 125, the upper bearing member 15 can be easily positioned in the axial direction.

  FIG. 7 is a view showing the vicinity of a bearing holding portion 123 of a motor according to another example. The wave washer 18 is disposed between the outer ring 151 of the upper bearing member 15 and the extending portion 124. The outer ring 151 and the extending portion 124 indirectly contact each other in the axial direction via the wave washer 18, whereby a preload is applied to the outer ring 151 in a direction away from the extending portion 124. Thereby, a preload is applied to the upper bearing member 15 and the lower bearing member 16. Further, by arranging the wave washer 18 below the upper bearing member 15, the upper bearing member 15 and the lower bearing member 16 can be separated in the axial direction by the thickness of the wave washer 18. Also in the motor 1 shown in FIG. 6, the wave washer 18 may be disposed between the outer ring 151 of the upper bearing member 15 and the extending portion 126.

  FIG. 8 is a perspective view of a part of the motor 1 showing another example of the protrusion of the mounting plate. The length of the protrusion 52a in the axial direction is shorter than that of the protrusion 52 shown in FIG. The width of the protrusion 52 a in the circumferential direction is wider than that of the protrusion 52. Further, the flange cutout 44 shown in FIG. 5 is omitted from the flange 4.

  When the cover member 12 and the mounting plate 13 are fixed, the central portion 521 of the protruding portion 52a is formed on the upper surface of the flange portion 4 by pressing in a state where the flange portion 4 and the mounting plate 13 are in contact with each other in the axial direction. It is bent slightly as it is crushed to 45. Thereby, the cover member 12 and the attachment plate 13 are easily fixed. In the motor 1, since the length in the axial direction of the protrusion 52 a is slightly longer than the thickness of the flange 4, the protrusion 52 a can be brought into contact with the upper surface 45 of the flange 4 by one press working. . Moreover, since the width in the circumferential direction of the projection 52a is wide, the circumferential direction of the region in which the projection 52a is crushed even when the jig and the central portion 521 of the projection 52a are slightly displaced during pressing of the projection 52a. Is prevented from becoming smaller. As a result, a decrease in fastening strength between the cover member 12 and the mounting plate 13 is prevented.

  9 and 10 are views showing an upper bearing member 191 and a lower bearing member 192 of a motor according to another example. Each of the upper bearing member 191 and the lower bearing member 192 is a sleeve impregnated with lubricating oil. As shown in FIG. 9, the cover member 12 includes a bearing holding portion 125 extending upward, and the extending portion 126 of the bearing holding portion 125 and the upper bearing member 192 abut on each other in the axial direction. A retaining ring 212 is attached to the outer peripheral surface of the shaft 21 above the upper bearing member 192. As shown in FIG. 10, the lower bearing member 192 is fixed to the inner peripheral surface of the bush 31. Another retaining ring 213 is attached to the outer peripheral surface of the shaft 21 below the lower bearing member 192. The retaining rings 212 and 213 play a role of preventing the shaft 21 from coming off from the bush 31 and the cover member 12. In the motor 1, the shaft 21 is supported by the upper bearing member 191 and the lower bearing member 192 so as to be smoothly rotatable using lubricating oil.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible. In the motor 1, various preload members other than the wave washer may be provided. For example, even if a cylindrical elastic member is provided between the outer ring 161 of the lower bearing member 16 and the stepped portion 312 in the bush 31, and a downward preload acts on the outer ring 161 by the elastic member. Good.

  The inner ring 152 of the upper bearing member 15 is not necessarily press-fitted into the shaft 21. For example, a step that abuts the lower part of the inner ring 152 in the axial direction is provided on the outer peripheral surface of the shaft 21. The upper bearing member 15 can be fixed to the shaft 21 by providing a C-type retaining ring or the like on the outer peripheral surface of 21. Also in the lower bearing member 16, the inner ring 152 may be fixed to the shaft 21 using a C-type retaining ring or the like.

  In the above embodiment, an opening penetrating the flange portion 4 may be provided instead of the flange cutout portion 44. A protruding portion that protrudes downward may be provided on the flange portion 4, and a notch portion may be provided on the outer edge portion 13 a of the mounting plate 13 to perform caulking and fixing between the protruding portion and the notch portion. In this case, you may improve the intensity | strength in the fixing location of the attachment board 13 by making the site | part surrounding a notch protrude in a step shape toward upper direction. The mounting plate 13 may be provided with a step portion protruding upward, and the flange portion 4 may be provided with a recess that fits into the step portion. This prevents the cover member 12 from being displaced in the circumferential direction with respect to the mounting plate 13.

  When the increase in the number of parts is allowed, the cover member 12 and the mounting plate 13 may be screwed. In the mounting plate 13, four or more mounting holes 131 may be arranged in the circumferential direction. The cylindrical portion that extends downward from the lid portion 122 of the cover member 12 may have a shape other than a cylinder.

  The method of fixing the cover member 12 to the mounting plate 13 may be applied to a motor other than a large motor such as a heater or a washing machine or a home appliance.

  The configurations in the above embodiment and each modification may be combined as appropriate as long as they do not contradict each other.

  The present invention can be used for motors for various purposes.

DESCRIPTION OF SYMBOLS 1 Motor 4 Flange part 6 Boundary 12 Cover member 13 Mounting plate 15,191 Upper bearing member 16,192 Lower bearing member 17,18 Wave washer 21 Shaft 23 Rotor magnet 31 Bush 32 Stator 45 Upper surface 121 (Cylinder part) 121 Cylindrical part 122 Lid portion 123, 125 Bearing holding portion 124, 126 Extending portion 131 Mounting hole 151, 161 Outer ring 152, 162 Inner ring 211 Lower part of shaft (221) 221 Rotor holder 222 Cylindrical portion J1 Central axis

Claims (13)

A bearing,
A shaft that is supported by the bearing so as to be rotatable around a central axis facing in the vertical direction;
With Bush,
A stator fixed to the outer peripheral surface of the bush;
A substantially cylindrical rotor holder with a lid fixed to the shaft;
A rotor magnet fixed to the inner peripheral surface of the cylindrical portion of the rotor holder, and positioned on the radially outer side of the stator;
A plate formed of metal and extending from the lower end of the bush outward in the radial direction, and having a mounting portion used for mounting to a mounting target;
A cover member that is formed of metal and has a substantially cylindrical shape with a cover that covers the rotor holder, and a lower end portion of the cylindrical portion is fixed to the mounting plate;
With
The cover member includes a cylindrical bearing holding portion centering on the central axis at the center of the lid portion,
The bearing comprises two bearing members;
One motor is fixed to the inner peripheral surface of the bearing holding portion, and the other bearing member is fixed to the inner peripheral surface of the bush.   The motor according to claim 1, wherein an output side end portion of the shaft projects downward from the mounting plate. An axial end of the bearing holding portion includes an extending portion extending radially inward,
The motor according to claim 1, wherein the extending portion is in direct or indirect contact with the one bearing member in the axial direction.   The motor according to claim 3, wherein the bearing holding portion extends upward from the lid portion.   The motor according to claim 3, wherein the bearing holding portion extends downward from the lid portion.   The motor according to claim 5, wherein an upper portion of the one bearing member is positioned above the bearing holding portion. The two bearing members are two ball bearings;
The motor according to claim 5 or 6, further comprising a preload member that applies a preload toward the lower side to an outer ring of the other bearing member on an upper side of the other bearing member. The two bearing members are two ball bearings;
The preload member which provides a preload between the one bearing member and the extending portion in a direction away from the extending portion with respect to the outer ring of the one bearing member, 7. The motor described in. An outer ring of the one bearing member is fixed to the inner peripheral surface of the bearing holding portion with an adhesive, and an inner ring is fixed to the shaft;
The motor according to claim 7 or 8, wherein an outer ring of the other bearing member is fixed to the inner peripheral surface of the bush with an adhesive, and an inner ring is fixed to the shaft.   The motor according to claim 1, wherein the other bearing member is located at a lower portion of the inner peripheral surface of the bush. The lower end portion of the cylindrical portion includes a flange portion that extends radially outward,
11. The motor according to claim 1, wherein a part of the mounting plate is bent onto an upper surface of the flange portion and contacts the upper surface.   The boundary between the tube portion of the cover member and the mounting plate exists over the entire circumference centering on the central axis, and the tube portion and the mounting plate are shaped along each other at the boundary. The motor according to claim 1.   The motor according to any one of claims 1 to 12, wherein the attachment portion is three or more attachment holes arranged in a circumferential direction.

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