JP2017022890A - motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure that can fix a circuit board to a board holding part, while reducing the size of the board holding part and preventing contact with a coil.SOLUTION: The motor has a circuit board 22 and a board holding part for holding the circuit board. The board holding portion has a plate-like body portion and a caulking portion 50 extending upward from the plate-like body portion. The circuit board has a through hole 60 or a notch through which the caulking portion passes. The caulking portion has a pair of fixing protrusions 52 protruding toward the upper surface side of the circuit board and extending in opposite directions. The pair of fixing protrusions are positioned radially inside the radially inner surface of the rotor magnet. Thus, the circuit board can be fixed to the board holding portion, while reducing the size of the circuit board. At least a part of the pair of fixing protrusions is disposed at a position not overlapping the coil 42 in plan view. Thereby, it is possible to prevent the pair of fixing protrusions from coming into contact with the coil.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a motor.

Conventionally, a main motor used in a printer or a copier has a circuit board and a mounting plate formed of a steel plate. An electric circuit for supplying a driving current to the motor coil is mounted on the circuit board. The circuit board is fixed to the mounting plate. The mounting plate is fixed to the frame of the apparatus by screwing or the like. The structure of a conventional motor having a circuit board and a mounting plate is described in, for example, JP-A-11-98770.
JP-A-11-98770

  In the motor disclosed in Japanese Patent Laid-Open No. 11-98770, the galvanized steel plate and the printed circuit board are caulked by four caulking portions (see paragraphs 0010, FIG. 5 and FIG. 6). However, in FIG. 5 of the document, two of the four caulking portions are arranged on the radially outer side than the rotor. In such a structure, the galvanized steel plate has to be extended to the outside in the radial direction of the rotor for fixing to the printed circuit board. For this reason, it is difficult to reduce the size of the galvanized steel plate used for one motor.

  An object of the present invention is to provide a structure capable of fixing a circuit board to a board holding part while suppressing the size of the board holding part and avoiding contact with a coil.

  An exemplary first invention of the present application includes a stationary portion and a rotating portion that is rotatably supported with respect to the stationary portion, and the rotating portion is disposed along a central axis that extends vertically. A shaft and a rotor magnet that rotates together with the shaft, and the stationary portion includes a bearing that rotatably supports the shaft, a bearing holding portion having a cylindrical portion that holds the bearing, and the cylindrical shape A stator located radially outside the rotor magnet and radially inside the rotor magnet, a circuit board disposed substantially perpendicular to the central axis below the stator, and the bearing holder A substrate holding portion that is directly or indirectly fixed and holds the circuit board, the stator has a plurality of coils arranged in a circumferential direction, and the substrate holding portion has the central axis Perpendicular to A plate-like main body portion to be placed, and a caulking portion extending upward from the plate-like main body portion, the circuit board has a through-hole or a notch through which the caulking portion passes, and the caulking portion is A pair of fixing protrusions protruding to the upper surface side of the circuit board and extending in opposite directions to each other, the pair of fixing protrusions being positioned radially inward from a radially inner surface of the rotor magnet; In the motor, at least a part of the pair of fixing protrusions is disposed at a position not overlapping the coil in a plan view.

  According to the first exemplary invention of the present application, the pair of fixing protrusions are disposed radially inward from the radially inner surface of the rotor magnet. As a result, the circuit board can be fixed to the substrate holding unit while suppressing the size of the substrate holding unit. In addition, at least a part of the pair of fixing protrusions is disposed at a position that does not overlap the coil in plan view. Thereby, it can prevent that a pair of fixing protrusion contacts a coil.

FIG. 1 is a longitudinal sectional view of a motor according to the first embodiment. FIG. 2 is a top view of the stationary portion according to the first embodiment. FIG. 3 is a partial longitudinal sectional view of the mounting plate and the circuit board according to the first embodiment. FIG. 4 is a partial longitudinal sectional view of the mounting plate and the circuit board according to the first embodiment. FIG. 5 is a top view of the stationary part according to the second embodiment. FIG. 6 is a longitudinal sectional view of a mounting plate and a circuit board according to a modified example before fixing. FIG. 7 is a longitudinal sectional view after fixing of the mounting plate and the circuit board according to the modification.

  Below, the example of a motor is disclosed. In the following examples, the direction parallel to the central axis of the motor is the “axial direction”, the direction orthogonal to the central axis of the motor is the “radial direction”, and the direction along the arc centered on the central axis of the motor is the “circumferential direction”. Direction ". Further, in the present application, the shape and positional relationship of each part will be described with the axial direction being the vertical direction and the stator side being “up” with respect to the circuit board. However, the definition of the vertical direction is not intended to limit the orientation of the motor according to the present invention during manufacture and use.

<1. First Embodiment>
<1-1. Overall configuration of motor>
FIG. 1 is a longitudinal sectional view of a motor 1 according to the first embodiment. The motor 1 of this embodiment is mounted on an OA device such as a printer or a copier, and is used to operate a driving unit such as a roller. However, the motor of the present invention may be used for applications other than OA equipment. For example, the motor of the present invention may be used for transportation equipment such as automobiles, home appliances, medical equipment, disk drives, blower fans, and the like to generate various driving forces.

  As shown in FIG. 1, the motor 1 has a stationary part 2 and a rotating part 3. The stationary part 2 is relatively stationary with respect to the frame of the device to be driven. The rotating unit 3 is rotatably supported with respect to the stationary unit 2.

  FIG. 2 is a top view of the stationary part 2. As shown in FIGS. 1 and 2, the stationary part 2 includes a mounting plate 21, a circuit board 22, a bearing holder 23, a bearing part 24, and a stator 25.

  The mounting plate 21 is a plate-like member that holds the circuit board 22. The mounting plate 21 is an example of a substrate holding part. As the material of the mounting plate 21, a metal having higher rigidity than the circuit board 22 is used. For example, a galvanized steel sheet, SUS, an aluminum alloy, or the like is used as the material of the mounting plate 21. The mounting plate 21 is fixed to the frame of the device to be driven. The mounting plate 21 has a plate-shaped main body 211. The plate-like main body 211 is disposed perpendicular to the central axis 9. However, “vertical” as used herein includes substantially vertical. The plate-shaped main body 211 is provided with a first circular hole 212. The first circular hole 212 is disposed substantially coaxially with the central axis 9 and penetrates the plate-shaped main body 211 in the axial direction.

  The circuit board 22 is a board on which an electric circuit for supplying a drive current to a coil 42 described later is mounted. As the circuit board 22, for example, a glass epoxy board or a paper phenol board is used. The circuit board 22 is disposed substantially perpendicular to the central axis 9 on the upper side in the axial direction than the mounting plate 21 and on the lower side in the axial direction than the stator 25. In addition, the circuit board 22 has a second circular hole 221. The second circular hole 221 is disposed coaxially with the central axis 9 and penetrates the circuit board 22 in the axial direction. There is a gap between the upper surface of the mounting plate 21 and the lower surface of the circuit board 22. For this reason, the circuit board 22 can mount electronic components constituting an electric circuit not only on its upper surface but also on its lower surface.

  As shown in FIG. 2, the circuit board 22 of the present embodiment has a sensor pattern 222. The sensor pattern 222 is an electric wiring pattern for detecting a magnetic flux generated from a second magnetic pole portion 332 of the rotor magnet 33 described later. The sensor pattern 222 is formed in an annular shape around the central axis 9. In FIG. 2, the position of the rotor magnet 33 is indicated by a two-dot chain line. The sensor pattern 222 is located radially outside the stator 25 and below the rotor magnet 33 in the axial direction.

  The bearing holder 23 has a cylindrical portion 231 and a flange portion 232. The cylindrical portion 231 extends in a substantially cylindrical shape in the axial direction around the central axis 9. The cylindrical portion 231 is inserted into the first circular hole 212 of the mounting plate 21 and the second circular hole 221 of the circuit board 22. The cylindrical portion 231 holds the bearing portion 24 on the radially inner side and holds the stator 25 on the radially outer side. The flange portion 232 is located on the lower side in the axial direction than the mounting plate 21. The flange portion 232 extends from the lower end portion of the tubular portion 231 toward the radially outer side. The mounting plate 21 is fixed to the flange portion 232.

  The bearing portion 24 is a mechanism that rotatably supports the shaft 31 of the rotating portion 3. The bearing portion 24 of the present embodiment has a first bearing 241 and a second bearing 242. The second bearing 242 is disposed below the first bearing 241. For the first bearing 241 and the second bearing 242, for example, ball bearings that relatively rotate the outer ring and the inner ring via a sphere are used. The outer rings of the first bearing 241 and the second bearing 242 are fixed to the inner peripheral surface of the cylindrical portion 231 of the bearing holder 23. On the other hand, the inner rings of the first bearing 241 and the second bearing 242 are fixed to the outer peripheral surface of the shaft 31. However, other types of bearings such as oil-impregnated sintered bearings may be used instead of the ball bearings. Moreover, the number of the bearings which comprise the bearing part 24 may be one, and may be three or more.

  The stator 25 is an armature that generates a rotating magnetic field according to a drive current. The stator 25 is located on the radially outer side of the cylindrical portion 231 of the bearing holder 23, on the radially inner side of the rotor magnet 33 described later, and on the axially upper side of the circuit board 22. The stator 25 has a stator core 41 and a plurality of coils 42.

  For the stator core 41, for example, a laminated steel plate that is a magnetic material is used. The stator core 41 has an annular core back 411 and a plurality of teeth 412. The cylindrical portion 231 of the bearing holder 23 is press-fitted inside the core back 411 in the radial direction. Thereby, the stator core 41 is fixed to the outer peripheral surface of the cylindrical portion 231. The plurality of teeth 412 protrudes radially outward from the core back 411. The plurality of teeth 412 are arranged at substantially equal intervals in the circumferential direction. The coil 42 is composed of a conductive wire wound around each tooth 412. Therefore, the plurality of coils 42 are also arranged at substantially equal intervals in the circumferential direction.

  The rotating unit 3 according to the present embodiment includes a shaft 31, a rotor holder 32, and a rotor magnet 33.

  The shaft 31 is a columnar member disposed along the central axis 9. For example, a metal such as stainless steel is used as the material of the shaft 31. The shaft 31 rotates around the central axis 9 while being supported by the bearing portion 24. The upper end portion of the shaft 31 projects upward from the first bearing 241. Further, the lower end portion of the shaft 31 projects downward from the second bearing 242. The lower end portion of the shaft 31 is connected to a movable portion of a device to be driven via a power transmission mechanism such as a gear.

  The rotor holder 32 is a metal member that rotates together with the shaft 31. The rotor holder 32 has a top plate portion 321 and a cylindrical portion 322. The top plate portion 321 extends substantially perpendicular to the central axis 9 and in a substantially flat plate shape above the coil 42 in the axial direction. The inner peripheral portion of the top plate portion 321 is fixed to the upper end portion of the shaft 31. The cylindrical portion 322 extends in a cylindrical shape from the outer peripheral portion of the top plate portion 321 downward.

  The rotor magnet 33 is fixed to the inner peripheral surface of the cylindrical portion 322 of the rotor holder 32. The rotor magnet 33 rotates together with the shaft 31 and the rotor holder 32. For the rotor magnet 33, for example, a ferrite magnet or a neodymium magnet is used. The rotor magnet 33 of this embodiment is a single annular magnet. However, the rotor magnet 33 may be composed of a plurality of magnets arranged in the circumferential direction.

  The inner peripheral surface of the rotor magnet 33 serves as a first magnetic pole portion 331 that faces the plurality of teeth 412 of the stator core 41 in the radial direction. The first magnetic pole portion 331 is alternately magnetized with N and S poles in the circumferential direction. Further, the lower surface of the rotor magnet 33 serves as a second magnetic pole portion 332 that faces the circuit board 22 in the axial direction. The second magnetic pole portion 332 is alternately magnetized with N and S poles in the circumferential direction. However, the second magnetic pole portion 332 is magnetized in the circumferential direction at a finer pitch than the first magnetic pole portion 331.

  When a drive current is supplied to the coil 42 via the circuit board 22, a rotating magnetic field is generated in each tooth 412 of the stator core 41. Then, circumferential torque is generated by the action of magnetic flux between the teeth 412 and the first magnetic pole portion 331 of the rotor magnet 33. As a result, the rotating unit 3 rotates about the central axis 9. Further, when the motor 1 is driven, the position of the magnetic pole of the second magnetic pole portion 332 of the rotor magnet 33 is detected by the sensor pattern 222. The drive current supplied to the coil 42 is adjusted based on the detection signal of the sensor pattern 222. Thereby, the rotational speed of the rotation part 3 is controlled accurately.

<1-2. Mounting plate and circuit board fixing structure>
Next, a method for fixing the mounting plate 21 and the circuit board 22 will be described.

  As shown in FIG. 2, the mounting plate 21 of the present embodiment has three caulking portions 50. Each caulking portion 50 extends upward from the plate-like main body portion 211 of the mounting plate 21. At the time of manufacturing the mounting plate 21, for example, the caulking portion 50 is formed by raising a part of the mounting plate 21 by press working. On the other hand, the circuit board 22 has three through holes 60. The three caulking portions 50 are inserted into the through holes 60, respectively. The upper end portion of each caulking portion 50 protrudes above the upper surface of the circuit board 22.

  3 and 4 are partial longitudinal sectional views of the mounting plate 21 and the circuit board 22 in the vicinity of the caulking portion 50. FIG. FIG. 3 shows a state viewed in the circumferential direction. FIG. 4 shows a state viewed in the radial direction.

  As shown in FIGS. 3 and 4, the caulking portion 50 of this embodiment includes a pedestal portion 51 and a pair of caulking projections 52. The pedestal 51 extends upward from the plate-like main body 211 and is located below the circuit board 22. The lower surface of the circuit board 22 contacts the upper surface of the pedestal 51. As a result, the circuit board 22 is supported and the position of the circuit board 22 in the axial direction is determined. The caulking protrusion 52 is an example of a fixing protrusion. The pair of caulking protrusions 52 are positioned on the upper side in the axial direction from the pedestal portion 51. At least a part of the caulking protrusion 52 protrudes toward the upper surface side of the circuit board 22. The pair of caulking protrusions 52 extend in directions opposite to each other.

  When fixing the circuit board 22 to the mounting plate 21, first, the three caulking portions 50 of the mounting plate 21 are respectively inserted into the three through holes 60 of the circuit board 22. More specifically, a pair of caulking projections 52 of each caulking portion 50 is inserted into the through hole 60. Then, the lower surface of the circuit board 22 is brought into contact with the upper surface 511 of each pedestal portion 51. At this point, the pair of caulking protrusions 52 are standing upward as indicated by a two-dot chain line in FIG. Subsequently, pressure is applied to the caulking protrusion 52 from above. Thereby, of the pair of caulking protrusions 52, the caulking protrusions 52 positioned on the radially inner side are tilted radially inward. Of the pair of caulking protrusions 52, the caulking protrusions 52 located on the radially outer side are tilted outward in the radial direction. Thus, the pair of caulking protrusions 52 are plastically deformed in directions opposite to each other. As a result, as shown by a solid line in FIG. 3, the pair of caulking protrusions 52 are in a state of extending in the opposite directions in the radial direction.

  Each caulking protrusion 52 is in contact with the upper surface of the circuit board 22. As a result, the circuit board 22 is sandwiched between the pedestal 51 and the caulking protrusion 52 in the axial direction. As a result, the circuit board 22 is firmly fixed to the mounting plate 21 in the axial direction. The circuit board 22 has a land portion 61 in at least a part of the periphery of the through hole 60. In the land portion 61, a copper foil layer 223 that is a metal is exposed on the upper surface of the circuit board 22. The pair of caulking protrusions 52 after plastic deformation is in contact with the upper surface of the land portion 61. In this way, the circuit board 22 and the caulking protrusion 52 can be fixed more firmly than when the caulking protrusion 52 is brought into contact with the resin layer of the circuit board 22. Further, damage to the circuit board 22 due to the contact of the caulking protrusion 52 can be suppressed.

  Note that the copper foil layer 223 constituting the land portion 61 is electrically insulated from the electric circuit on the circuit board 22. However, the copper foil layer 223 constituting the land portion 61 may be connected to the ground terminal so that the land portion 61 and the mounting plate 21 are maintained at a constant potential.

  As described above, the circuit board 22 may be made of glass epoxy or paper phenol. However, in the case of paper phenol, it is possible to reduce the manufacturing cost of the circuit board 22, while it becomes particularly difficult to firmly fix the circuit board 22 to the mounting plate 21. For this reason, the structure of the crimping part 50 of this embodiment is especially useful. If the pair of caulking projections 52 are plastically deformed in opposite directions and brought into contact with the upper surface of the circuit board 22 as in the present embodiment, the circuit board 22 made of paper phenol is firmly attached to the mounting plate 21. Can be fixed.

  As shown in FIG. 2, the three caulking portions 50 are all located on the radially inner side of the radially inner surface of the rotor magnet 33. For this reason, it is not necessary to expand the mounting plate 21 radially outward from the rotor magnet 33 in order to fix the circuit board 22. Therefore, the circuit board 22 can be fixed to the mounting plate 21 while suppressing the size of the mounting plate 21. Further, all of the three caulking portions 50 are located on the radially inner side with respect to the annular sensor pattern 222. For this reason, the shape of the sensor pattern 222 is not limited by the three caulking portions 50.

  As shown in FIG. 2, the pair of caulking protrusions 52 of each caulking portion 50 is disposed between the coils 42 adjacent in the circumferential direction in plan view. That is, the pair of caulking projections 52 of each caulking portion 50 does not overlap the coil 42 in plan view. Thus, if the caulking protrusion 52 is disposed using the space between the adjacent coils 42, the caulking protrusion 52 can be prevented from contacting the coil 42.

  The caulking protrusion 52 and the coil 42 may partially overlap in plan view. For example, when the coil 42 bulges in the circumferential direction on the upper side in the axial direction from the caulking protrusion 52, a part of the caulking protrusion 52 and the bulged part of the coil 42 may overlap in the axial direction. Even in this case, it is only necessary that the caulking protrusion 52 and the bulging portion of the coil 42 are separated from each other in the axial direction, so that they are not in contact. That is, the caulking protrusion 52 only needs to be disposed at a position where at least a portion thereof does not overlap the coil 42 in plan view.

  In the present embodiment, the pair of caulking protrusions 52 of each caulking portion 50 are arranged in the radial direction. That is, the pair of caulking protrusions 52 are plastically deformed radially inward and radially outward, respectively. In this way, it is possible to suppress the circuit board 22 from being curved in the radial direction with respect to the central axis 9 as compared with the case where the pair of caulking protrusions 52 are arranged in other directions. Therefore, the circuit board 22 can be prevented from being distorted by heat or pressure when the motor 1 is used.

  In the motor 1, three caulking portions 50 are provided on the mounting plate 21. The three caulking portions are arranged at substantially the same radial distance with respect to the central axis 9 and are arranged at equal intervals in the circumferential direction. In this way, the mounting plate 21 and the circuit board 22 can be fixed at three locations evenly arranged around the central axis 9. Therefore, the number of caulking portions 50 can be suppressed and the circuit board 22 can be fixed horizontally. In particular, when the motor 1 is a three-phase brushless DC motor, the number of coils 42 is a multiple of three. Therefore, the caulking portions 50 can be arranged at equal intervals in the circumferential direction while avoiding contact with the coil 42 as described above.

<2. Second Embodiment>
FIG. 5 is a top view of the stationary part 2A of the motor according to the second embodiment. In FIG. 5, in order to clearly indicate the position of the caulking portion 50A, the stator 25 is indicated by a broken line.

  In the example of FIG. 5, the mounting plate has three caulking portions 50A at the radially inner end edge, that is, the peripheral edge portion of the first circular hole 212A. The three caulking portions 50A are arranged at equal intervals in the circumferential direction. Further, the circuit board 22A has three notches 60A at the radially inner end, that is, the peripheral edge of the second circular hole 221A. The three notches 60A are also arranged at equal intervals in the circumferential direction.

  Each of the three caulking portions 50A is inserted into the notch 60A of the circuit board 22A. Then, a pair of caulking projections 52A of each caulking portion 50A protrudes above the upper surface of the circuit board 22A. As shown in FIG. 5, the pair of caulking protrusions 52A of each caulking portion 50A is located radially inward from the coil 42A. Further, the pair of caulking projections 52A of each caulking portion 50A are arranged in the circumferential direction and are plastically deformed in directions opposite to each other in the circumferential direction. Each caulking protrusion 52A comes into contact with a land portion 61A exposed on the upper surface of the circuit board 22A around the notch 60A.

  Also in the example of FIG. 5, the pair of caulking projections 52A of each caulking portion 50A does not overlap with the coil 42A in plan view. Therefore, the caulking protrusion 52A can be prevented from contacting the coil 42A. As described above, the caulking portion 50A may be arranged using the space inside the coil 42A in the radial direction. The caulking protrusion 52A and the coil 42A may partially overlap in plan view. That is, at least a portion of the caulking protrusion 52A only needs to be disposed radially inward of the coil 42A in plan view.

  In the example of FIG. 5, the three caulking portions 50 </ b> A are arranged further radially inward than in the first embodiment. Therefore, the circuit board 22A can be fixed to the mounting plate while further reducing the size of the mounting plate. Further, the mounting space for the electric circuit can be made wider outside in the radial direction than the caulking portion 50A.

<3. Modification>
As mentioned above, although two embodiment of this invention was described, this invention is not limited to said embodiment.

  FIG. 6 is a longitudinal sectional view of the mounting plate 21B and the circuit board 22B according to a modified example before fixing. FIG. 7 is a longitudinal sectional view of the mounting plate 21B and the circuit board 22B of FIG. 6 after being fixed. In the example of FIGS. 6 and 7, the caulking portion 50B includes a pedestal portion 51B, and caulking protrusions 52B and locking protrusions 53B that are positioned on the upper side in the axial direction from the pedestal portion 51B. The caulking protrusion 52B and the locking protrusion 53B are examples of a fixing protrusion. As shown in FIG. 6, the caulking protrusion 52 </ b> B stands up upward in a state before plastic deformation. On the other hand, the locking protrusion 53B is bent in an approximately L shape before being fixed to the circuit board 22B. The tip of the locking projection 53B extends horizontally toward the side opposite to the caulking projection 52B.

  In the example of FIGS. 6 and 7, the mounting plate 21B has an L-shaped hook portion 80B separately from the caulking portion 50B. The hook portion 80B extends upward in the axial direction from the plate-like main body portion 211B, bends in the same direction as the locking projection 53B, and extends horizontally. On the other hand, the circuit board 22B is provided with a first through hole 60B through which the caulking part 50B passes and a second through hole 90B through which the hook part 80B passes.

  When fixing the circuit board 22B to the mounting plate 21B, first, the caulking portion 50B is inserted into the first through hole 60B, and the hook portion 80B is inserted into the second through hole 90B. Then, a part of the circuit board 22B is inserted between the pedestal 51B and the locking projection 53B and between the plate-like main body 211B and the hook 80B. As a result, as shown in FIG. 7, the locking projection 53B and the hook portion 80B extend in the same direction along the upper surface of the circuit board 22B.

  Subsequently, pressure is applied to the caulking protrusion 52B from above. As a result, the caulking projection 52B is plastically deformed to the side opposite to the bending direction of the locking projection 53B and the hook portion 80B. As a result, as shown in FIG. 7, the caulking protrusion 52B comes into contact with the end surface of the circuit board 22B constituting the first through hole 60B.

  As described above, in the example of FIGS. 6 and 7, the locking protrusion 53 </ b> B is bent in advance among the pair of fixed protrusions. For this reason, at the time of fixing the mounting plate 21B and the circuit board 22B, it is possible to more easily fix the circuit board 22B to the mounting plate 21B by reducing the places to be plastically deformed. In addition, as shown in FIG. 7, the position of the circuit board 22B in the horizontal direction relative to the mounting plate 21B can be more firmly fixed by bringing the caulking protrusion 52B after plastic deformation into contact with the end face rather than the upper face of the circuit board 22B. .

  In the above embodiment, the mounting plate is directly fixed to the bearing holder. However, the mounting plate may be indirectly fixed to the bearing holder via another member. Further, the mounting plate may be omitted, and the circuit board may be fixed by providing a caulking portion on the flange portion of the bearing holder. In that case, a cylindrical part becomes a bearing holding part among a bearing holder, and a flange part becomes a board | substrate holding part.

  In addition, about the detailed shape of a motor, it does not need to correspond completely with each drawing of this application. Moreover, you may combine suitably each element which appeared in said embodiment and modification in the range which does not produce inconsistency.

  The present invention can be used for a motor.

DESCRIPTION OF SYMBOLS 1 Motor 2, 2A Static part 3 Rotating part 9 Central axis 21, 21B Mounting plate 22, 22A, 22B Circuit board 23 Bearing holder 24 Bearing part 25 Stator 31 Shaft 32 Rotor holder 33 Rotor magnet 41 Stator core 42, 42A Coil 50, 50A, 50B Caulking portion 51, 51B Pedestal portion 52, 52A, 52B Caulking projection 53B Locking projection 60 Through hole 60A Notch 60B First through hole 61, 61A Land portion 80B Hook portion 90B Second through hole 211, 211B Plate-like main body portion 212, 212A 1st circular hole 221, 221A 2nd circular hole 222 Sensor pattern 223 Copper foil layer 231 Cylindrical part 232 Flange part 331 1st magnetic pole part 332 2nd magnetic pole part 411 Core back 412 Teeth

Claims (12)

A stationary part;
A rotating part supported rotatably with respect to the stationary part;
Have
The rotating part is
A shaft disposed along a central axis extending vertically;
A rotor magnet that rotates with the shaft;
Have
The stationary part is
A bearing that rotatably supports the shaft;
A bearing holding portion having a cylindrical portion for holding the bearing;
A stator located on the radially outer side of the cylindrical part and on the radially inner side of the rotor magnet;
A circuit board disposed below the stator and substantially perpendicular to the central axis;
A substrate holding part that is directly or indirectly fixed to the bearing holding part and holds the circuit board;
Have
The stator has a plurality of coils arranged in the circumferential direction,
The substrate holder is
A plate-like main body disposed perpendicular to the central axis;
A caulking portion extending upward from the plate-shaped main body portion;
Have
The circuit board has a through hole or a notch through which the caulking portion passes,
The caulking portion has a pair of fixing protrusions protruding toward the upper surface side of the circuit board and extending in opposite directions to each other,
The pair of fixing protrusions are located radially inward from the radially inner surface of the rotor magnet,
The motor in which at least a part of the pair of fixing protrusions is disposed at a position where it does not overlap the coil in plan view. The motor according to claim 1,
The pair of fixing protrusions extend in opposite directions in the radial direction,
The motor in which at least a part of the pair of fixing protrusions is disposed between the coils adjacent in the circumferential direction in a plan view. The motor according to claim 1,
The pair of fixing protrusions extend in opposite directions in the circumferential direction,
The motor in which at least a part of the pair of fixing protrusions is disposed radially inward of the coil in a plan view. In the motor according to any one of claims 1 to 3,
The circuit board has a land portion where a metal is exposed in at least a part of the periphery of the through hole or notch,
The pair of fixing protrusions are in contact with the land portion. In the motor according to any one of claims 1 to 4,
The substrate holding part has three caulking parts,
The three caulking portions are motors arranged at equal intervals in the circumferential direction. In the motor according to any one of claims 1 to 5,
The substrate holder is
Further having an L-shaped hook portion extending upward from the plate-shaped main body portion and bending along the upper surface of the circuit board,
The said crimp part is a motor arrange | positioned on the opposite side to the direction of the bending of the said hook part. The motor according to any one of claims 1 to 6, wherein
The pair of fixing protrusions are a pair of caulking protrusions that are plastically deformed in directions opposite to each other when fixed to the circuit board. The motor according to any one of claims 1 to 6, wherein
One of the pair of fixing protrusions is a caulking protrusion that is plastically deformed when fixed to the circuit board,
The other of the pair of fixing protrusions is a motor that is a locking protrusion that extends to a side opposite to the caulking protrusion from before fixing to the circuit board. The motor according to claim 7 or 8,
The caulking protrusion is in contact with the upper surface of the circuit board. The motor according to claim 7 or 8,
The caulking protrusion is in contact with an end surface of the circuit board constituting the through hole or the notch. In the motor according to any one of claims 1 to 10,
The circuit board is a motor made of paper phenol. The motor according to any one of claims 1 to 11, wherein
The rotor magnet is
A first magnetic pole portion facing the stator;
A second magnetic pole portion facing the circuit board;
Have
The second magnetic pole portion is magnetized in the circumferential direction at a finer pitch than the first magnetic pole portion,
The circuit board has an annular sensor pattern for detecting the second magnetic pole part,
The said caulking part is a motor located in the radial inside rather than the said sensor pattern.

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