JP2012029345A - Motor and electric mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure attachment intensity of a base portion of a motor and to prevent interference of a screw being a male screw with a circuit board.SOLUTION: A static portion 3 of the motor includes: a stator 32 which is arranged at a periphery of a bearing mechanism 4 and faces a rotor magnet 22 in a radial direction; the base portion 31 which is positioned below the stator 32 and extends in a direction vertical to a center axis; and the circuit board 33 fixed to an upper face of the base portion 31. A female screw passing through the base portion 31 and the circuit board 33 are overlapped in a direction parallel to the center axis. A peripheral region of the female screw on the upper face of the base portion is positioned in a place lower than a circuit board placement region which is a region abutting on or close to the circuit board on the upper face.

Description

  The present invention relates to an electric motor.

Conventionally, motors are used in various devices such as air conditioners and robots. For example, in an air conditioner, the control valve is opened and closed using the torque of a motor. In such a motor, a mounting hole is provided in the base portion of the motor, and other members in the device and the base portion are screwed together. Japanese Unexamined Patent Application Publication No. 2009-232676 discloses a motor mounted on a disk drive device. In the mounting plate to which the circuit board is mounted, mounting holes for fixing the mounting plate and other members in the disk drive device are provided in a portion protruding laterally from the outer peripheral edge of the circuit board.
JP 2009-232676 A

  By the way, in recent years, due to the downsizing of devices and the increase in the number of parts, the space for mounting motors in the devices has become narrow, and the motors are required to be downsized. However, if a screw fixing female screw portion is provided in a range where the size of the base portion is reduced and overlaps the circuit board, the tip of the screw interferes with the circuit board. When measures are taken to ensure that the tip of the screw does not protrude from the female screw portion, the range in which the screw is screwed into the female screw portion is shortened, and the mounting strength of the base portion is reduced. Further, if the base part is fixed to the attachment part with a short screw, the screw may be damaged.

  An object of the present invention is to secure the mounting strength of a base portion and prevent interference of a screw, which is a male screw, with a circuit board.

  An exemplary motor of the present invention includes a stationary part, a rotating part, and a bearing mechanism that rotatably supports the rotating part with respect to the stationary part around a central axis, the rotating part having a lid A substantially cylindrical rotor hub, and a rotor magnet fixed to the inside of the cylindrical portion of the rotor hub, wherein the stationary portion is disposed around the bearing mechanism and is opposed to the rotor magnet in a radial direction. A base portion extending below the stator and extending in a direction perpendicular to the central axis, and a circuit board fixed to the upper surface of the base portion, wherein the base portion penetrates the base portion. The female screw portion and the circuit board are overlapped in a direction parallel to the central axis, and a screw portion peripheral region that is a region around the female screw portion of the upper surface of the base portion is included in the upper surface. Above Located below the depositing area substrate placement is a region in contact with or in proximity to road substrate.

  ADVANTAGE OF THE INVENTION According to this invention, while ensuring the attachment intensity | strength of a base part, the interference to the circuit board of the external thread for attachment can be prevented.

FIG. 1 is a cross-sectional view illustrating the electric mechanism according to the first embodiment. FIG. 2 is a cross-sectional view of a part of the electric mechanism. FIG. 3 is a plan view of the base portion. FIG. 4 is a cross-sectional view of the base portion. FIG. 5 is a bottom view of the base portion. FIG. 6 is a diagram illustrating another example of the base portion. FIG. 7 is a cross-sectional view of a part of the motor according to the second embodiment. FIG. 8 is a plan view of the base portion.

  In the present specification, the upper side in the central axis direction 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.

(First embodiment)
FIG. 1 is an enlarged view showing a part of the internal configuration of the electric mechanism 10 according to the first embodiment of the present invention. The electric mechanism 10 is used, for example, for opening / closing a control valve in an air conditioner. The electric mechanism 10 includes a motor 11, a power transmission mechanism 12, a mounting portion 13, and a screw 14 that is a male screw. FIG. 2 is an enlarged view showing the vicinity of the attachment portion 13 of FIG. The attachment portion 13 includes a central hole portion 131 and a plurality of peripheral hole portions 132 that penetrate the attachment portion 13 around the central hole portion 131. The motor 11 is placed on the mounting portion 13 and fixed with screws 14.

  As shown in FIG. 1, the power transmission mechanism 12 includes a first gear 121, a second gear 122, and a shaft member 123. The first gear 121 is fixed to the tip of a shaft 41 described later of the motor 11. The second gear 122 engages with the first gear 121. One end of the shaft member 123 is fixed to the center of the second gear 122. Actually, the power transmission mechanism 12 has a plurality of other components. When the electric mechanism 10 is driven, the first gear 121 is rotated by the rotation of the motor 11, and the second gear 122 engaged with the first gear 121 is also rotated. The shaft member 123 fixed to the second gear 122 rotates around the central axis J2. Thus, the power of the motor 11 is transmitted by the rotation of the first and second gears 121 and 122 and the shaft member 123.

  The motor 11 is an outer rotor type motor. The motor 11 includes a rotating unit 2 that is a rotating assembly, a stationary unit 3 that is a fixed assembly, and a bearing mechanism 4. The rotating part 2 is supported so as to be rotatable with respect to the stationary part 3 about the central axis J1 of the motor 11 via the bearing mechanism 4.

  The rotating unit 2 includes a lid-shaped substantially cylindrical rotor hub 21 and a rotor magnet 22. The rotor magnet 22 is fixed inside the cylindrical portion 211 of the rotor hub 21.

  The stationary part 3 includes a base part 31, a stator 32, and a circuit board 33. The base portion 31 is formed of a metal, for example, a galvanized steel plate. The base portion 31 is annular and extends in a direction perpendicular to the central axis J1. The circuit board 33 is fixed to the upper surface 5 of the base portion 31 (hereinafter referred to as “base upper surface 5”) with an adhesive, an adhesive, or the like. On the circuit board 33, a Hall sensor (Hall element, Hall IC, or the like) 331 that faces the rotor magnet 22 in the vertical direction is mounted. Further, a connector 332 is mounted on a portion of the circuit board 33 that protrudes outward in the radial direction from the base portion 31. The stator 32 is disposed around the bearing mechanism 4 above the base portion 31 and faces the rotor magnet 22 in the radial direction centered on the central axis J1. Hereinafter, the radial direction around the central axis J1 is simply referred to as “radial direction”. When the motor 11 is driven, torque is generated between the rotor magnet 22 and the stator 32.

  The bearing mechanism 4 includes a shaft 41, a sleeve 42, a substantially cylindrical bearing holding portion 43, two annular upper seal portions 44, and an annular lower seal portion 45. The shaft 41 is inserted into the sleeve 42. The upper end of the shaft 41 in FIG. 1 is fixed to a hole provided at the center of the lid portion 212 of the rotor hub 21. The first gear 121 described above is fixed to the lower end of the shaft 41.

  The sleeve 42 is formed of an oil-containing sintered metal. The bearing holding portion 43 covers the outer periphery of the sleeve 42. A base portion 31 is fixed to the outer periphery of the lower portion of the bearing holding portion 43. A flange portion 431 that protrudes radially outward is provided below the base portion 31 of the bearing holding portion 43. As shown in FIG. 2, the flange portion 431 is located inside the central hole portion 131 of the attachment portion 13. Instead of the sleeve 42, other bearing parts such as a ball bearing may be used.

  The upper seal portion 44 and the lower seal portion 45 shown in FIG. 1 are attached to the inside of the upper portion and the lower portion of the bearing holding portion 43, respectively. The shaft 41 passes through the upper seal portion 44 and the lower seal portion 45. A retaining member 411 is attached below the lower seal portion 45 of the shaft 41 to prevent the shaft 41 and the rotating portion 2 from moving upward.

  In the bearing mechanism 4, the lubricating oil is held in the bearing mechanism 4 by the bearing holding portion 43, the upper seal portion 44 and the lower seal portion 45. When the motor 11 is driven, the shaft 41 is rotatably supported with respect to the sleeve 42 via lubricating oil. In addition, since the shaft 41 rotates together with the rotating unit 2, the shaft 41 may be regarded as a part of the rotating unit 2.

  FIG. 3 is a plan view of the base portion 31. FIG. 4 is a cross-sectional view of the base portion 31 taken along the position indicated by the arrow A in FIG. The base portion 31 includes a central hole portion 311, three recessed portions 312, a female screw portion 313, and two protrusions 314. As shown in FIG. 2, when the base portion 31 is fixed to the bearing holding portion 43, the bearing holding portion 43 is inserted into the hole portion 311 of the base portion 31 from below. The hole portion 311 is located between the annular caulking portion 432 and the flange portion 431 of the bearing holding portion 43, and the upper end edge of the hole portion 311 is lowered downward by bending the caulking portion 432 outward in the radial direction. It is pressed toward the outside in the radial direction. 1 and 2 show a state before the caulking portion 432 is bent outward in the radial direction.

  The recess 312 shown in FIG. 4 is formed as a part pushed down below the surrounding part by half-punching the plate member that is the base of the base part 31. That is, when the plate member is plastically deformed by the punch, the depression 312 is formed by stopping the lowering in the middle. By using the half punching process, the upper surface 51 and the lower surface 61 of the recess 312 easily become a surface perpendicular to the central axis J1. As shown in FIG. 3, the three recessed portions 312 are provided at approximately equal intervals in the circumferential direction around the central axis J <b> 1 and surround the periphery of the bearing holding portion 43. Hereinafter, the circumferential direction around the central axis J1 is simply referred to as “circumferential direction”.

  As shown in FIGS. 3 and 4, the internal thread portion 313 is located in the recess portion 312 and penetrates the base portion 31 in a direction parallel to the central axis J1. The thread of the female thread portion 313 is provided over the (almost) full length of the screw hole. Of course, when there are incomplete thread portions or chamfers, complete internal threads are not formed at these portions. In the following description, the upper surface 51 of the recessed portion 312, that is, the region around the female screw portion 313 in the base upper surface 5 is referred to as “screw portion surrounding region 51”.

  In the base portion 31, the circuit board 33 is placed in a region 52 located above the screw portion surrounding region 51 in the base upper surface 5. Hereinafter, the region 52 is referred to as a “substrate placement region 52”. As shown in FIG. 4, the distance in the direction parallel to the central axis J <b> 1 between the screw portion surrounding region 51 and the substrate placement region 52 is about 1/3 times the thickness of the base portion 31. A side wall 511 between the screw portion surrounding area 51 and the substrate placement area 52 is parallel to the central axis J1. As a result, the substrate placement area 52 can be expanded to the vicinity of the boundary with the screw portion surrounding area 51.

  In the substrate placement region 52, a protrusion 314 that protrudes upward is provided. The protrusion 314 is formed by half punching of the plate member that is the base of the base portion 31, as in the case of the recessed portion 312. When the circuit board 33 is attached to the base portion 31, as shown in FIG. 2, the protrusion 314 of the base portion 31 is inserted into a minute positioning hole 333 provided in the circuit board 33. Thereby, the position and direction with respect to the base part 31 of the circuit board 33 are determined easily. In a state where the circuit board 33 is attached to the board mounting area 52, the circuit board 33 overlaps the female screw part 313 in a direction parallel to the central axis J1. Here, “overlap” includes a case where the circuit board 33 partially overlaps the female screw portion 313 in a direction parallel to the central axis J1. Further, since the screw portion peripheral region 51 is located below the substrate placement region 52, the female screw portion 313 is separated from the circuit board 33.

  In the present embodiment, the base portion 31 can be formed from a relatively thin plate member by using half punching. In the following description, it is simply expressed as “thin” that the base portion 31 is not thick as compared with the case where half-cutting is not used. When the base portion is formed of a thick plate member, it is difficult to reduce the diameter of the positioning projection, but by using the thin base portion 31, the projection 314 having a small diameter can be easily formed. Can do. Further, the size of the hole 333 of the circuit board 33 can be reduced, and a region where wiring is formed and a region where electronic components are mounted can be further secured. As a result, the circuit board 33 can be made small.

  As shown in FIG. 3, in the base portion 31, only the periphery of the female screw portion 313 is recessed downward, so that a portion between the female screw portion 313 and the female screw portion 313 in the circumferential direction is a substrate placement region 52. It has become a part of. Thereby, the board | substrate mounting area | region 52 exists in a wide range, and the circuit board 33 can be fixed on the base part 31 stably.

  FIG. 5 is a bottom view of the base portion 31. In FIG. 5, cross hatching is given to the lower surface 61 corresponding to the recessed portion 312 in the lower surface of the base portion 31 (hereinafter referred to as “base lower surface 6”). Further, an annular region around the hole 311 (hereinafter referred to as “central annular region 62”) is also cross-hatched. As shown in FIG. 2, the lower surface 61 of the recess 312 is positioned below the central annular region 62 in the direction parallel to the central axis J1, and the motor 11 is mounted on the mounting portion 13 in the mounting direction. It contacts the upper surface of the part 13. Hereinafter, the lower surface 61 is referred to as an “attachment region 61”. In the plane including the central axis J1, the side wall 521 at a portion between the central annular area 62, the flush area, and the attachment area 61 is parallel to the central axis J1. Thereby, the attachment region 61 can be expanded to the side wall 521.

  The central annular region 62 is in contact with the upper surface of the flange portion 431 of the bearing holding portion 43 in the vertical direction. In the base portion 31, the parallelism of the central annular region 62 is managed with the attachment region 61 as a reference plane. That is, the processing of the central annular region 62 is performed with the attachment region 61 as a reference, and the base portion 31 in which the parallelism of the central annular region 62 is not sufficient is excluded. Thereby, the perpendicularity of the shaft 41 with respect to the attachment region 61 is easily ensured. As a result, the motor 11 is prevented from falling over the mounting portion 13. In the base part 31, the inclination of the circuit board 33 on the board | substrate mounting area | region 52 is also prevented. Thereby, the contact between the rotating part 2 and the circuit board 33 shown in FIG. 1 is prevented, and damage to the wiring pattern is prevented. Furthermore, the position of the rotor magnet 22 can be accurately detected by the hall sensor 331. Further, the height of the bearing holding portion 43 in the direction of the central axis J1 is managed using the mounting region 61 as a reference surface, and the accuracy of the height of the motor 11 can be easily ensured.

  When the motor 11 is attached to the attachment portion 13, the flange portion 431 of the bearing holding portion 43 is made to face the female screw portion 313 of the base portion 31 and the peripheral hole portion 132 of the attachment portion 13 in the vertical direction. The center hole 131 of the mounting portion 13 is fitted. Next, the screw 14 is inserted into the peripheral hole portion 132 from below and is screwed into the female screw portion 313. As a result, the base portion 31 is fixed to the attachment portion 13. In the direction parallel to the central axis J1, the incomplete threaded portion 142 at the tip of the screw 14 is located between the threaded portion surrounding region 51 and the substrate placement region 52 in the vertical direction.

  By the way, in the case of a motor in which the circuit board is in contact with the base part at a position where the base part is screwed, the tip of the screw interferes with the circuit board. In order to ensure that the tip of the screw does not protrude from the female screw part, it is necessary to make the screw shorter than the axial length (depth dimension) of the female screw part and the mounting part. As a result, the meshing tooth with the female screw part The number decreases.

  On the other hand, in the motor 11, as shown in FIG. 2, by providing the recess 312, the incomplete thread 142 at the tip of the screw 14 in the direction parallel to the central axis J 1 is And the substrate placement area 52. This prevents the screw 14 from interfering with the circuit board 33. In addition, the complete threaded portion 141 of the screw 14 can be screwed over the entire length of the female threaded portion 313 without shortening the screw 14, and the mounting strength between the base portion 31 and the mounting portion 13 is sufficiently ensured. .

  Further, since the circuit board 33 is not provided with a hole for letting out the tip of the screw, the circuit board can be designed in common with a motor having another structure. As a result, the circuit board 33 can be manufactured at low cost. Since there is no screw escape hole in the circuit board 33, it is possible to secure a sufficient area for wiring of the circuit board 33 and an area for mounting electronic components.

  In the motor 11, the base portion can be made smaller compared to a case where a portion that does not overlap the circuit board is provided in the base portion and the motor is screwed at the portion. Moreover, since the thickness of the base part 31 is thin, the internal thread part 313 with a small diameter can be formed easily, and the base part 31 can be made smaller. As a result, the motor 11 can be reduced in size.

  By using the thin base portion 31, the base portion 31 can be easily caulked and fixed to the bearing holding portion 43. The contact position between the central annular region 62 of the base portion 31 and the upper surface of the flange portion 431 of the bearing holding portion 43 shown in FIG. 2 is positioned higher in the direction of the central axis J1 than when the base portion is thick. be able to. As a result, the overall height of the bearing holding portion 43 can be reduced, and the motor 11 can be reduced in thickness. For the base portion 31, inexpensive press parts are used, and the original member is thin, so that the manufacturing cost of the motor 11 is reduced.

  In the base portion 31, the amount of displacement of the hollow portion 312 with respect to the surrounding portion can be accurately adjusted without considering the influence of the spring back by using the half punching process. This prevents the distance between the attachment area 61 and the substrate placement area 52 from becoming unnecessarily large. When the amount of displacement of the recess 312 is small and the base 31 is allowed to be thick, the base 31 may be thickened to increase the engagement length between the female screw 313 and the screw 14. The distance between the screw portion surrounding region 51 and the substrate placement region 52 is that a part of the incomplete screw portion 142 of the screw 14 is located above the screw portion surrounding region 51 in the direction parallel to the central axis J1. In addition, in order to secure the strength of the base portion 31 to 0.5 mm or more, it is preferable to set it to 3/4 times or less the thickness of the base portion 31.

  In the motor 11, as shown in FIG. 6, a through hole 315 for positioning the circuit board 33 may be provided in the substrate placement area 52 of the base portion 31. The through hole 315 is formed so as to extend parallel to the central axis J1 by punching. When the circuit board 33 is attached to the base portion 31, pins are inserted into the through holes 315 and the holes 333 of the circuit board 33 shown in FIG. 2, thereby positioning the circuit board 33 with respect to the base portion 31. Is called. Also in FIG. 6, since the base member of the base portion 31 is thin, the through hole 315 having a small diameter can be easily formed. For this reason, the diameter of the hole 333 formed in the circuit board 33 can also be reduced, and a region such as wiring on the circuit board 33 can be sufficiently secured.

(Second Embodiment)
FIG. 7 is a partial cross-sectional view of the motor 11a according to the second embodiment. In the motor 11a, three recessed portions 312a are formed in the circumferential direction. The recessed portion 312a is formed as a portion bent downward from the surrounding portion by bending the plate member that is the base of the base portion 31. In the bending process, the recess 312a is formed by a single press in principle. The base portion 31 is formed of a metal, for example, a galvanized steel plate. The female screw part 313 is provided in the hollow part 312a and penetrates the base part 31 in the vertical direction. FIG. 8 is a plan view of the base portion 31. The three recessed portions 312a are arranged at equal intervals in the circumferential direction so as to surround the periphery of the bearing mechanism 4 of FIG. The shape of the recess 312a when viewed in plan is a circle. Hereinafter, similarly to the first embodiment, the upper surface of the recessed portion 312a in which the female screw portion 313 is formed is referred to as a “thread portion surrounding region 51”. A region on the base upper surface 5 where the circuit board 33 is placed is referred to as a “substrate placement region 52”. The other structure of the motor 11a is the same as that of the motor 11, and hereinafter, the same reference numerals are given to the same components for explanation.

  The screw portion surrounding area 51 is positioned below the substrate placement area 52. A cross section obtained by cutting a portion 512 between the screw portion surrounding region 51 and the substrate placement region 52 along a plane including the central axis J1 is inclined downward and inclined toward the center of the recessed portion 312a. In a state where the circuit board 33 is attached to the base portion 31, it overlaps at least a part of the female screw portion 313 in a direction parallel to the central axis J1. The motor 11 a is fixed to the mounting portion 13 by inserting the screw 14 into the peripheral hole portion 132 of the mounting portion 13 and screwing with the female screw portion 313.

  Also in the second embodiment, by providing the recess 312a, a distance between the base 31 and the circuit board 33 is ensured, and the screw 14 is prevented from interfering with the circuit board 33. Furthermore, the screw 14 can be screwed together with the female thread portion 313 for a sufficient length, and the attachment strength between the base portion 31 and the attachment portion 13 can be sufficiently ensured. In the motor 11a, since the screwing can be performed at a position overlapping the circuit board 33 of the base portion 31, the base portion 31 can be made small. As a result, the motor 11a can be reduced in size.

  By utilizing the bending process, the base portion 31 can be formed from a thin plate member. Thereby, the contact position in the up-down direction of the base part 31 and the flange part 431 can be located above. As a result, the overall height of the bearing holding portion 43 can be reduced.

  In the motor 11a, if the distance between the mounting portion 13 and the circuit board 33 is allowed to some extent, a recess 312a that bends greatly downward by bending may be formed. Thereby, even if the long screw 14 is used, interference between the screw 14 and the circuit board 33 is prevented.

  In the second embodiment, the recessed portion 312a may be formed by drawing the plate member. In the drawing process, a portion of the base portion 31 in the vicinity of the recess 312a is work-hardened by performing press a plurality of times to compress the plate member in the thickness direction. Thereby, the screw 14 is firmly attached to the female screw part 313, and the attachment strength between the base part 31 and the attachment part 13 can be improved.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible. For example, in the base portion 31, four or more female screw portions 313 may be provided. Two female screw portions 313 may be provided in the base portion 31. That is, the base portion 31 is provided with two or more female screw portions 313. The plurality of female screw portions 313 are desirably arranged in an axial symmetry. Similarly, the base portion 31 is provided with two or more recess portions that are recessed downward, and each female screw portion 313 is provided in each recess portion. Also in this case, it is preferable that the circuit board 33 is stably fixed to the base portion 31 by using a part between the female screw part 313 and the adjacent female screw part 313 as a part of the board mounting area 52. Can do.

  When two or more female screw portions 313 are provided in the base portion 31, the angle around the central axis J1 between two adjacent female screw portions 313 is 180 degrees or less, preferably 120 degrees or less. Accordingly, the female screw portion 313 is disposed in the circumferential direction so as to surround the bearing mechanism 4, and the base portion 31 is appropriately fixed to the attachment portion 13. There may be only one female screw portion 313 that at least partially overlaps the circuit board 33 in the vertical direction.

  In the said embodiment, when you may use a thick board member as the base part 31, it may replace with press work and a hollow part may be formed by cutting. In the cutting process, the base portion 31 is formed with high accuracy. By cutting, the weight of the base portion 31 is reduced as compared with the case where a thick plate member is used as it is as the base portion 31. Even in this case, similarly to the above-described embodiment, interference with the circuit board 33 at the tip of the screw 14 is prevented while sufficiently securing the mounting strength between the base portion 31 and the mounting portion 13. For example, brass is used for the plate member that is the base of the base portion 31.

  The base portion 31 may be formed using die casting. Furthermore, the base portion 31 may be formed by resin injection molding. By forming the base part 31 with a resin material, the base part 31 can be manufactured at low cost. By using die-casting and resin injection molding, the indented portion can be easily and accurately formed. The shape of the base portion 31 in plan view is not limited to a circle, and may be a polygon (triangle, quadrangle, etc.) or an ellipse.

  In the motors 11 and 11a, since the base portion 31 is firmly fastened to the mounting portion 13 and the verticality of the shaft 41 is secured, these motors can be used in addition to opening and closing control valves in the air conditioner. It is suitable for an electric mechanism that obtains a large output torque through a power transmission mechanism, such as driving of a surveillance camera.

  The technique for preventing the screw 14 from interfering with the circuit board 33 may be applied to a motor in which the circuit board 33 is attached to the stator via an insulator. Also in the motor, the screw portion peripheral region 51 of the base portion 31 is positioned below the substrate mounting region 52 adjacent to the circuit board 33, thereby preventing the tip of the screw 14 from interfering with the circuit board 33. Is done. The above method may be applied to attachment of a motor unit and an attachment part of a fan in a device on which the fan is mounted.

  The present invention can be used as a motor of various electric mechanisms that output power, and can also be used as a motor other than the electric mechanism.

2 Rotating part 3 Static part 4 Bearing mechanism 5 Upper surface (of base part) 10 Electric mechanism 11, 11a Motor 13 Mounting part 14 Screw 21 Rotor hub 22 Rotor magnet 31 Base part 32 Stator 33 Circuit board 41 Shaft 42 Sleeve 43 Bearing holding part 51 Screw part peripheral area 52 Substrate placement area 121 First gear 122 Second gear 123 Shaft member 132 Peripheral hole part 211 Cylindrical part 311 (Base part) hole part 313 Female thread part 314 Projection 315 Through hole J1 Central axis

Claims (8)

A stationary part;
A rotating part;
A bearing mechanism that rotatably supports the rotating portion with respect to the stationary portion around a central axis;
With
The rotating part is
A substantially cylindrical rotor hub with a lid;
A rotor magnet fixed to the inside of the cylindrical portion of the rotor hub;
With
The stationary part is
A stator disposed around the bearing mechanism and opposed to the rotor magnet in a radial direction;
A base portion located below the stator and extending in a direction perpendicular to the central axis;
A circuit board fixed to the upper surface of the base part;
With
The base portion includes a female screw portion that penetrates the base portion,
The female screw portion and the circuit board are overlapped in a direction parallel to the central axis, and a screw portion peripheral region that is a region around the female screw portion of the upper surface of the base portion is connected to the circuit substrate of the upper surface. A motor that is positioned below a substrate placement area that is in contact with or close to the substrate.   The motor according to claim 1, wherein the peripheral portion of the screw portion is formed by half-punching a plate member that is a base of the base portion.   The motor according to claim 1, wherein the peripheral portion of the screw portion is formed by bending a plate member that is a base of the base portion.   The motor according to claim 1, wherein the peripheral portion of the screw portion is formed by drawing a plate member that is a base of the base portion. Protrusions or through holes projecting upward are provided in the substrate placement region of the base portion,
The motor according to any one of claims 2 to 4, wherein the protrusion or the through hole is formed by half punching or punching, and is used for positioning the circuit board with respect to the base portion. The base portion includes two or more female screw portions penetrating the base portion, and the two or more female screw portions are positioned to surround the bearing mechanism;
The two or more female screw portions and the circuit board overlap in a direction parallel to the central axis, and two or more screw portion surrounding regions, which are regions around the two or more female screw portions, of the upper surface of the base portion. A part of the substrate placement region is located between each female screw portion and an adjacent female screw portion in a circumferential direction centered on the central axis and positioned below the substrate placement region. The motor according to any one of 1 to 5. The bearing mechanism is
A shaft whose upper end is fixed to the rotor hub;
A bearing part into which the shaft is inserted;
A bearing holding portion covering the outer periphery of the bearing component;
With
The motor according to claim 1, wherein the bearing holding portion is inserted and fixed in a hole formed in the base portion. A motor according to any one of claims 1 to 7;
A gear fixed to the rotating part;
Other gears that engage with the gears and transmit the power of the motor;
A mounting portion to which the base is fixed;
A male screw that is inserted into the through hole of the mounting portion and screwed into the female screw portion, thereby fixing the base portion to the mounting portion;
An electric mechanism.

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