JP6693148B2 - motor - Google Patents

Description

  The present invention relates to a motor.

  Conventionally, an outer rotor type motor is known (Patent Document 1).

Japanese Utility Model Publication No. 4-124881

  Generally, various measures have been taken to reduce the weight of a motor. On the other hand, for motors that require various outputs, attempts have been made to reduce costs by standardizing parts such as unifying bearing sizes.

  One aspect of the present invention aims to provide a motor that is light in weight while achieving cost reduction by using a general-purpose bearing.

One aspect of a motor of the present invention is a shaft arranged along a central axis extending in a vertical direction, a rotor portion having a rotor magnet and rotating with the shaft, a tubular portion surrounding an outer peripheral surface of the shaft, and the rotor portion. A bracket having a first surface that extends radially outward from the lower end of the tubular portion, a bearing portion located between the inner peripheral surface of the tubular portion and the outer peripheral surface of the shaft, the tubular portion having a stator core and a coil. A stator portion surrounding an outer peripheral surface of the core back, the stator core having an annular core back and teeth extending radially outward of the core back, and the inner peripheral surface of the core back protruding inward in the radial direction. A plurality of convex portions are provided, a radial inner end of the convex portion contacts an outer peripheral surface of the cylindrical portion, a lower surface of the convex portion contacts the first surface, and an inner peripheral surface of the convex portion. Faces radially outward Groove recessed I has a position, on the outer peripheral surface of the cylindrical portion of the bracket is positioned is bulged portion bulged radially outwardly to contact with the groove and the protruding portion.

  According to one aspect of the present invention, a general-purpose bearing is used to reduce the cost and provide a lightweight motor.

FIG. 1 is a sectional view of the motor according to the first embodiment. FIG. 2 is an exploded view of a part of the motor according to the first embodiment. FIG. 3 is a plan view of the circuit board and the bracket for fixing the circuit board according to the first embodiment. FIG. 4 is a perspective view of the stator portion of the first embodiment and peripheral members to which the stator portion is assembled. FIG. 5 is a perspective view of the positioning member of the first embodiment. FIG. 6 is a perspective view of the stator portion of the second embodiment and peripheral members to which the stator portion is assembled. FIG. 7 is a perspective view showing a state in which the bracket of the third embodiment and the stator portion are assembled. FIG. 8 is a sectional view of the motor of the fourth embodiment. FIG. 9 is a plan view of the stator according to the fourth embodiment.

  Hereinafter, a motor according to an embodiment of the present invention will be described with reference to the drawings. The scope of the present invention is not limited to the following embodiments and can be arbitrarily changed within the scope of the technical idea of the present invention. Moreover, in the following drawings, in order to make each structure easy to understand, the scale and the number of each structure may be different from the actual structure.

  Further, in the drawings, an XYZ coordinate system is appropriately shown as a three-dimensional orthogonal coordinate system. In the XYZ coordinate system, the Z-axis direction is the vertical direction. The X-axis direction is the left-right direction in FIG. 1 among the directions orthogonal to the Z-axis direction. The Y-axis direction is a direction orthogonal to both the X-axis direction and the Z-axis direction.

  Further, unless otherwise specified, in the following description, a radial direction centered on a central axis J extending in the up-down direction (Z-axis direction) is simply referred to as a “radial direction”, and a circumferential direction centered on the central axis J is referred to. That is, the circumference of the central axis J is simply referred to as “circumferential direction”. The vertical direction (Z-axis direction) corresponds to the axial direction of the central axis J.

In the present specification, "extending in the vertical direction" means not only extending in the strictly vertical direction (Z-axis direction) but also extending in a direction inclined by less than 45 ° with respect to the vertical direction. Including.
In addition, in the present specification, the term “extends in the radial direction” means that the term strictly extends in the radial direction, that is, the direction perpendicular to the vertical direction (Z-axis direction), and in addition to less than 45 ° to the radial direction. Including the case of extending in the inclined direction within the range.

  FIG. 1 is a cross-sectional view showing a motor 1 of this embodiment. Further, FIG. 2 is an exploded view of a part of the motor 1. The motor 1 is an outer rotor type brushless motor.

As shown in FIG. 1, the motor 1 includes a shaft 10, a rotor portion 20, a bracket 50, an upper bearing portion (bearing portion) 41, a lower bearing portion 42, a stator portion 30, and a positioning member 70. , The circuit board 60.
The shaft 10 and the rotor portion 20 are fixed to each other and rotate together around the central axis J. The bracket 50, the stator portion 30, the positioning member 70, and the circuit board 60 are fixed to each other. The bracket 50 is provided with a bearing holding hole 59 for holding the upper bearing portion 41 and the lower bearing portion 42. The bracket 50 supports the shaft 10 via the upper bearing portion 41 and the lower bearing portion 42.
The motor 1 supplies a drive current input from an external device to the stator unit 30 to generate a magnetic field in the stator unit 30, and the magnetic field rotates the rotor unit 20 and the shaft 10 around the central axis J.
Hereinafter, each component will be described in detail.

[shaft]
As shown in FIG. 1, the shaft 10 is a columnar shaft arranged along a central axis J extending in the vertical direction (Z-axis direction). The center of the shaft 10 coincides with the central axis J. The shaft 10 is rotatably supported by the bracket 50 via the upper bearing portion 41 and the lower bearing portion 42.

[Rotor part]
The rotor unit 20 is fixed to the shaft 10 and rotates with the shaft 10 about the central axis J. The rotor unit 20 includes a cylindrical rotor holder 24, a rotor magnet 25 fixed to the inner peripheral surface 24 c of the rotor holder 24, and a rotor hub 26.

  The rotor holder 24 has a cylindrical tubular portion 24a extending in the vertical direction and a top plate portion 24b extending radially inward from the upper end of the tubular portion 24a. At the center of the top plate portion 24b, a central hole 24d penetrating in the vertical direction is provided.

  The rotor magnet 25 is adhered and fixed to the inner peripheral surface 24c of the tubular portion 24a and held by the rotor holder 24. The rotor magnet 25 is a permanent magnet having different magnetic poles arranged in the circumferential direction of the rotor holder 24.

The rotor hub 26 connects the central hole 24d of the top plate portion 24b (that is, the radially inner end of the rotor holder 24) to the shaft 10.
The rotor hub 26 has a cylindrical shaft holding portion 26a, a flange portion 26b extending radially outward from the outer periphery of the shaft holding portion 26a, and a hub contact portion 26c formed by being deformed by caulking.
The shaft 10 is press-fitted into the shaft holding portion 26a. The axial lower end of the shaft holding portion 26a (that is, the axial lower end of the rotor hub 26) is positioned axially lower than the upper end of the core back 32 of the stator portion 30. The fastening length between the rotor hub 26 and the shaft 10 can be increased by extending the rotor hub 26 axially below the upper end of the core back 32. Thereby, the rotor hub 26 and the shaft 10 can be firmly fastened.
The upper surface of the flange portion 26b contacts the lower surface of the top plate portion 24b of the rotor holder 24. The hub contact portion 26c is formed radially outward and contacts the upper surface of the top plate portion 24b. The top plate portion 24b is vertically sandwiched between the flange portion 26b and the hub contact portion 26c to fix the rotor hub 26 and the rotor holder 24.

[bracket]
As shown in FIGS. 1 and 2, the bracket 50 includes an upper tubular portion (tubular portion) 51, a lower tubular portion 52, and a base portion 53 that extends radially outward from the outer peripheral surface of the lower tubular portion 52. Have.
The upper cylinder portion 51 and the lower cylinder portion 52 have a cylindrical shape extending along the central axis J. The upper cylinder portion 51 and the lower cylinder portion 52 surround the outer peripheral surface of the shaft 10. The lower tubular portion 52 has a larger outer diameter than the upper tubular portion 51, and is located below the upper tubular portion 51. At the boundary between the upper cylinder portion 51 and the lower cylinder portion 52, a first surface 52a serving as a step surface facing upward is provided. That is, the bracket 50 has the first surface 52a that extends radially outward from the lower end of the upper tubular portion 51.

As shown in FIG. 1, the inner circumferential surface of the upper tubular portion 51 and the inner circumferential surface of the lower tubular portion 52 communicate with each other to form a bearing holding hole 59 penetrating in the vertical direction. An inner projecting portion 59a that projects radially inward and narrows the inner diameter is provided in the middle of the bearing holding hole 59 in the vertical direction.
In the bearing holding hole 59, the upper bearing portion 41 is inserted above the inner protruding portion 59a. A wave washer (not shown) is inserted in the vertical gap between the inner protruding portion 59a and the upper bearing portion 41 to apply a preload to the upper bearing portion 41.
In the bearing holding hole 59, the lower bearing portion 42 is adhesively fixed to the lower side of the inner protruding portion 59a. In the assembly process, the lower bearing portion 42 is inserted into the bearing holding hole 59 after applying an adhesive to the inner peripheral surface of the bearing holding hole 59. The lower surface 59b of the inner protruding portion 59a contacts the upper surface of the outer race of the lower bearing portion 42.

As shown in FIG. 1, the base portion 53 is located below the upper tubular portion 51 and extends radially outward from the outer peripheral surface of the lower tubular portion 52.
As shown in FIG. 2, the base portion 53 has a flat plate portion 53a, an edge portion 53b, three first pedestal portions 53d, three second pedestal portions 53c, and three ribs 53f.

The flat plate portion 53a is a circular plate in a plan view. The plate surface of the flat plate portion 53a is orthogonal to the central axis J.
The edge portion 53b projects upward from the peripheral edge of the flat plate portion 53a.

  As shown in FIG. 2, the three first pedestal portions 53d respectively project upward from the flat plate portion 53a. Further, each of the three first pedestal portions 53d has a shape protruding radially outward from the outer peripheral surface of the lower tubular portion 52. The three first pedestal portions 53d are respectively arranged at positions that are rotationally symmetric with respect to the central axis J. First holes 54 are provided on the upper surfaces of the three first pedestal portions 53d, respectively. That is, the base portion 53 has the first hole 54. The first hole 54 extends downward from the upper surface of the first pedestal portion 53d. The lower projection 72 of the positioning member 70, which will be described later, is inserted into the first hole 54.

  As shown in FIG. 2, the three second pedestal portions 53c respectively project upward from the flat plate portion 53a. The three second pedestal portions 53c each have a shape protruding radially inward from the inner side surface of the edge portion 53b. The second pedestal portion 53c is located radially outside the first pedestal portion 53d. The upper end of the second pedestal portion 53c in the axial direction coincides with the upper end of the edge portion 53b in the axial direction, and forms a second surface 53e on which the circuit board 60 is mounted. Further, the three second pedestal portions 53c are provided with boss portions 56a, 57a, 58a extending upward, respectively. By mounting the circuit board 60 on the second surface 53e, the boss portions 56a, 57a, and 58a are inserted into the three fixing holes 66 provided in the circuit board 60, respectively. Furthermore, the bosses 56a, 57a, and 58a form the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 by caulking, and fix the circuit board 60 to the second surface 53e (see FIG. 3). .. That is, the second pedestal portion 53c overlaps the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 and is fixed to the circuit board 60 when viewed in the vertical direction. At this time, the lower surface of the circuit board 60 contacts the second surface 53e which is the upper end of the second pedestal portion 53c.

  As shown in FIG. 2, the second pedestal portion 53c is provided with a base hole 53g that vertically penetrates from the second surface 53e. As will be described later, rotation sensors 63a, 63b, 63c are mounted on the upper surface (board surface 62a) of the circuit board 60. The base hole 53g is provided at a position overlapping the rotation sensors 63a, 63b, 63c when viewed in the axial direction. Therefore, the lower surface of the circuit board 60 is in contact with the second pedestal portion 53c in a region surrounding the rotation sensors 63a, 63b, 63c in a plan view. The second pedestal portion 53c can stably support the rotation sensors 63a, 63b, 63c from the lower surface side of the circuit board 60, and maintains the detection accuracy of the rotation sensors 63a, 63b, 63c.

  As described above, the circuit board 60 is fixed to the base portion 53 on the second surface 53e of the second pedestal portion 53c. Therefore, as shown in FIG. 1, a space B as a vertical gap is provided between the lower surface of the substrate body 62 and the flat plate portion 53a. The coil wire 35a is soldered and fixed to the lower surface of the substrate body 62. By providing the space B, the vertical dimension for solder can be sufficiently secured. Further, a relatively large height mounting component such as a capacitor or an inverter may be mounted on the lower surface of the substrate body 62. In this case, the space B secures the vertical dimensions of these mounted components.

  As shown in FIG. 2, the rib 53f projects upward from the flat plate portion 53a. The three ribs 53f extend radially from the outer peripheral surface of the lower tubular portion 52 toward the second pedestal portion 53c, and connect the lower tubular portion 52 and the second pedestal portion 53c. The rib 53f can increase the strength of the base portion 53. In particular, the rib 53f connects the lower cylinder portion 52 and the second pedestal portion 53c, so that the deformation of the base portion 53 such that the second surface 53e of the second pedestal portion 53c moves in the vertical direction is effectively performed. Can be suppressed. Accordingly, the base portion 53 can maintain the detection accuracy of the rotation sensors 63a, 63b, 63c mounted on the circuit board 60 on the second pedestal portion 53c.

[Upper bearing and lower bearing]
The upper bearing portion 41 and the lower bearing portion 42 rotatably support the shaft 10 with respect to the bracket 50. As shown in FIG. 1, the upper bearing portion 41 is located between the inner peripheral surface of the upper cylindrical portion 51 and the outer peripheral surface of the shaft 10 in the radial direction. Similarly, the lower bearing portion 42 is located between the inner peripheral surface of the lower cylindrical portion 52 and the outer peripheral surface of the shaft 10 in the radial direction. The shaft 10 is press-fitted into the inner races of the upper bearing portion 41 and the lower bearing portion 42. The outer ring of the upper bearing portion 41 is fitted into the bearing holding hole 59 by a clearance fit, and a preload is applied to the upper side by a wave washer (not shown). Further, the outer ring of the lower bearing portion 42 is adhesively fixed to the bearing holding hole 59.

[Circuit board]
The circuit board 60 is mounted with various electronic components to form a motor drive circuit. As shown in FIG. 1, the circuit board 60 has a board surface 62a orthogonal to the central axis J. The circuit board 60 is located between the stator portion 30 and the base portion 53 of the bracket 50 in the vertical direction.

  FIG. 3 is a plan view of the circuit board 60 and the bracket 50 that fixes the circuit board 60. As shown in FIG. 3, the circuit board 60 includes a board body 62, a wiring connecting portion 65 provided on a board surface 62a of the board body 62, three rotation sensors 63a, 63b, 63c, and a first fixing portion 56. It has a second fixing portion 57 and a third fixing portion 58.

The substrate body 62 has a circular portion 62b having a circular shape in a plan view and a rectangular portion 62c extending radially outward from a part of the circular portion 62b in a rectangular shape.
A central hole 69 is provided at the center of the circular portion 62b of the substrate body 62. The lower cylinder portion 52 is inserted into the central hole 69. The central hole 69 is provided with three through holes 61 as notches extending outward in the radial direction. The through hole 61 penetrates in the vertical direction. Further, the through hole 61 overlaps with the first hole 54 provided in the base portion 53 of the bracket 50 when viewed in the vertical direction. The lower protrusion 72 of the positioning member 70, which will be described later, is inserted into the through hole 61.

  The substrate body 62 is provided with six coil wire through holes 68 arranged around the central hole 69 and penetrating in the axial direction. The coil wire 35 a extending from the coil 35 of the stator portion 30 is inserted into the coil wire through hole 68. The coil wire 35a is guided to the lower surface of the substrate body 62 and fixed by soldering.

  The board body 62 is provided with three fixing holes 66 penetrating in the vertical direction in the vicinity of the peripheral portion. The three fixing holes 66 configure the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 by inserting and crimping the boss portions 56a, 57a, and 58a of the base portion 53, respectively. Although the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 of the present embodiment are contact portions, they may be fixed portions by other fixing means such as screw fixing.

  A wiring connecting portion 65 is provided on the rectangular portion 62c of the substrate body 62. The wiring connection portion 65 has a width in the circumferential direction. A plurality of external wirings 9 are soldered and connected to the wiring connecting portion 65. An external device is connected to the circuit board 60 via the external wiring 9, and a power supply and a control signal are supplied from the external device.

  The rotation sensors 63a, 63b, 63c are attached to the substrate surface 62a which is the upper surface of the substrate body 62. The rotation sensor 63a is located immediately below the rotor magnet 25 and faces the rotor magnet 25 in the vertical direction. The three rotation sensors 63a, 63b, 63c are arranged side by side at equal intervals (that is, at intervals of 120 ° about the central axis J) along the circumferential direction. With this configuration, the accuracy of the three rotation sensors 63a, 63b, 63c can be maintained. Note that the three rotation sensors 63a, 63b, and 63c do not necessarily have to have the same circumferential angle, but it is preferable that at least two circumferential angles be equal. For example, it is preferable that the circumferential angle between the rotation sensor 63a and the rotation sensor 63b is equal to the circumferential angle between the rotation sensor 63b and the rotation sensor 63c. The rotation sensors 63a, 63b, 63c are Hall elements, for example.

  The circuit board 60 is fixed to the base portion 53 by the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58. The first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 are located radially outside the outer end (outer end surface 31a) of the stator portion 30 and inside the outer end 24e of the rotor holder 24. To do.

  By arranging the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 outside the outer end (outer end surface 31a) of the stator portion 30, the inner area is used as the wiring pattern area of the board surface 62a. Can be widely secured. In addition, in the assembly process, after the stator section 30 is assembled to the bracket 50, the caulking process for forming the first fixing section 56, the second fixing section 57, and the third fixing section 58 can be performed. Therefore, it is easy to simplify the assembly process.

  Further, by arranging the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 inside the outer end 24e of the rotor holder 24, the radial dimension of the circular portion 62b of the substrate body 62 can be reduced. This can contribute to downsizing of the motor 1.

  Furthermore, by arranging the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 outside the outer end surface 31 a of the stator portion 30 and inside the outer end 24 e of the rotor holder 24, the rotor magnet It is arranged immediately below 25. As a result, the rotation sensors 63a, 63b, 63c are arranged on the virtual circle VC passing through the first fixed portion 56, the second fixed portion 57 and the third fixed portion 58. The substrate body 62 is pressed against the second surface 53e of the base portion 53 by the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58, so that the first fixing portion 56, the second fixing portion 57, and The height accuracy of the substrate surface 62a is easily stabilized on the virtual circle VC through which the third fixing portion 58 passes. By disposing the rotation sensors 63a, 63b, 63c on the virtual circle VC, the accuracy of the rotation sensors 63a, 63b, 63c can be maintained.

Different rotation sensors 63a, 63b, 63c are located near the circumferential direction of the first fixed portion 56, the second fixed portion 57, and the third fixed portion 58, respectively. In the vicinity of the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58, the substrate main body 62 is pressed against the second surface 53e of the base portion 53, and the height accuracy of the substrate surface 62a becomes stable. The accuracy of the rotation sensors 63a, 63b, 63c can be maintained.
It should be noted that one (at least one) of the three rotation sensors 63a, 63b, 63c has a circumference in any one of the vicinity of the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 in the circumferential direction. It may be located near the direction. The three rotation sensors 63a, 63b, 63c complement each other with detection results and measure rotation. Since at least one of the three rotation sensors 63a, 63b, 63c is located in the vicinity of any one of the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 in the circumferential direction, the rotation sensors 63a, 63b, There is a certain effect of increasing the accuracy of the detection result of 63c.
In the present specification, the rotation sensor 63a, 63b, 63c and the first fixing portion 56, the second fixing portion 57 and the third fixing portion 58 and the "vicinity" regarding the circumferential position, the circumferential position of the other one, the other. It means that it is provided within a range of 15 ° or less centered on the central axis J.

The first fixing portion 56 is located in the vicinity of the one edge 65a that is one edge of the wiring connecting portion 65 in the circumferential direction. The second fixing portion 57 is located near the other edge 65b, which is the other edge of the wiring connecting portion 65, in the circumferential direction. Accordingly, even if a load is applied from the wiring connecting portion 65 in the plate thickness direction of the substrate body 62, the deformation and damage of the substrate body 62 can be suppressed. The one side in the circumferential direction means the side in the left rotation direction in FIG. 3, and the other side in the circumferential direction means the side in the right rotation direction in FIG.
In the present specification, “near” with respect to the circumferential position of the first fixing portion 56 or the second fixing portion 57 and the one edge 65a or the other edge 65b of the wiring connecting portion 65 means that the other circumferential position with respect to one is It means that it is provided within a range of 30 ° or less around the central axis J.

  In the circumferential direction, the third fixing portion 58 has a first portion on the one side (the left rotation direction in FIG. 3) of the first fixing portion 56 and on the other side (the right rotation direction in FIG. 3) of the second fixing portion 57. It is located in the area A1. As shown in FIG. 3, a first straight line L1 connecting the first fixing portion 56 and the central axis J to the substrate surface 62a of the substrate main body 62 and a second straight line L2 connecting the second fixing portion 57 and the central axis J. Assume The first region A1 is a region that does not include the wiring connection portion 65, of the two regions partitioned by the first straight line L1 and the second straight line L2. The third fixing portion 58 provided in the first region A1 is sufficiently separated from the wiring connecting portion 65 to fix the substrate main body 62 in a well-balanced manner together with the first fixing portion 56 and the second fixing portion 57.

  Further, it is preferable that the third fixing portion 58 is located in the second region A2 on the opposite side of the wiring connecting portion 65 with respect to the central axis J in plan view. As shown in FIG. 3, a third straight line L3 is assumed on the substrate surface 62a of the substrate body 62. The third straight line L3 is a straight line that passes through the central axis J and that is parallel to the straight line that connects the one edge 65a and the other edge 65b of the wiring connecting portion 65 in the circumferential direction. The second region A2 is a region that does not include the wiring connection portion 65, of the two regions on the substrate surface 62a defined by the third straight line L3. By providing the third fixing portion 58 in the second region A2, each fixing portion can be arranged in a well-balanced manner with respect to the central axis J. Therefore, the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 can fix the substrate body 62 to the base portion 53 without applying an excessive load to the substrate body 62. Therefore, the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 can suppress damage to the substrate body 62 due to the fixing even when the substrate body 62 having a thin plate thickness is used.

[Stator part]
As shown in FIG. 1, the stator portion 30 surrounds the outer peripheral surface 51b of the upper tubular portion 51 in the radial direction. The stator portion 30 has a stator core 34 and a coil 35. Further, the stator part 30 has an insulating part 39 located between the stator core 34 and the coil 35.

  The stator core 34 has an annular core back 32 and twelve teeth 31 extending radially outward of the core back 32. A coil wire 35 a is wound around each of the twelve teeth 31 to form a coil 35.

FIG. 4 shows a perspective view of the stator portion 30, the bracket 50 on which the stator portion 30 is assembled, and the peripheral members. The coil 35 is not shown in FIG.
As shown in FIG. 5, the inner peripheral surface 32 a of the core back 32 is provided with three protrusions 33 that protrude inward in the radial direction. The respective convex portions 33 are arranged at equal intervals in the circumferential direction.

  The radially inner end 33c of the convex portion 33 has an arc shape along the outer peripheral surface 51b of the upper tubular portion 51 in a plan view. The radially inner end 33c of the convex portion 33 contacts the outer peripheral surface 51b of the upper tubular portion 51. This determines the radial position of the stator core 34 with respect to the bracket 50.

  As shown in FIG. 1, the lower surface 33 a of the convex portion 33 contacts the first surface 52 a located between the upper tubular portion 51 and the lower tubular portion 52. Further, a contact portion 51 a that comes into contact with the upper surface 33 b of the convex portion 33 is provided at the upper end of the upper tubular portion 51, and the stator core 34 is fixed to the bracket 50. When the lower surface 33a of the convex portion 33 contacts the first surface 52a, the height direction position of the stator core 34 with respect to the bracket 50 is determined.

  The convex portion 33 is provided with a second hole 36 penetrating in the vertical direction. That is, the stator core 34 has the second holes 36. As shown in FIG. 1, the upper protrusion 71 of the positioning member 70, which will be described later, is inserted into the second hole 36. This determines the circumferential position of the stator core 34 with respect to the bracket 50. A magnetic path is hardly generated in the convex portion 33 when the coil 35 is energized. Therefore, by providing the second hole 36 in the convex portion 33, it is possible to reduce the influence on the output and to position the stator core 34 in the circumferential direction. The second hole 36 may be a through hole, and in the present embodiment, the second hole 36 is a through hole as shown in FIG.

According to the present embodiment, by providing the convex portion 33, it becomes easy to share the parts of the upper bearing portion 41, the lower bearing portion 42, and the bracket 50. Generally, in motor design, the outer diameter and inner diameter of the upper cylinder are designed according to the inner diameter of the core back according to the required output, and the bearing is selected according to the inner diameter of the upper cylinder. It was Therefore, it is necessary to prepare different brackets and bearings for each motor. On the other hand, according to the present embodiment, by providing the convex portion 33 on the inner peripheral surface 32 a of the core back 32, the upper bearing portion 41, the lower bearing portion 42, and the bracket 50 are different in inner diameter of the core back 32. It can be commonly used in motors with various outputs. As a result, the cost of the motor 1 can be reduced.
In addition, the provision of the convex portion 33 on the inner peripheral surface 32a of the core back 32 means that lightening is performed as compared with the case where the entire inner peripheral surface of the core back 32 contacts the upper tubular portion 51. means. Therefore, by providing the convex portion 33, the weight of the stator portion 30 can be reduced, and the weight of the motor 1 can be reduced.

  In this embodiment, three convex portions 33 are provided at equal intervals in the circumferential direction. Therefore, in the motor 1, since the contact points between the convex portion 33 and the upper cylinder portion 51 of the bracket 50 are provided at three locations at equal intervals in the circumferential direction, the radial positioning of the stator core 34 with respect to the bracket 50 is stable. In addition, the motor 1 can be lighter in weight than a motor provided with four or more protrusions 33. However, it is not always necessary to provide three protrusions 33, and four or more protrusions 33 may be provided. In particular, when the number of the convex portions 33 is preferable to reduce the vibration of the motor 1, four or more convex portions 33 may be provided. For example, in the present embodiment, the stator core 34 has 12 slots and the rotor magnet 25 has 14 poles. Therefore, the protrusions are formed so as to be relatively prime with respect to the number of slots and the number of poles. The number may be 5, 11, or the like. With this configuration, it is possible to prevent the plurality of convex portions 33 from resonating with the slots of the stator core 34 and the magnetic poles of the rotor magnet 25.

As shown in FIG. 4, the stator core 34 has two core portions (an upper core portion 34A and a lower core portion 34B) that are axially laminated and fixed to each other. The convex portion 33 is provided on at least one of the upper core portion 34A and the lower core portion 34B. The convex portion 33 is provided only on the lower core portion 34B, and is not provided on the upper core portion 34A. The upper core portion 34A has the same shape as the lower core portion 34B except that the convex portion 33 is not provided.
Since the convex portion 33 is provided on at least one of the upper core portion 34A and the lower core portion 34B, the axial length of the convex portion 33 is shorter than the axial length of the core back 32. A magnetic path is generated in the core back 32 when the coil 35 is energized, but a magnetic path is hardly generated in the convex portion 33, and even if the axial length is shortened, there is little influence on the output. Therefore, the short axial length of the convex portion 33 does not affect the output and can contribute to the weight reduction of the motor 1.
Further, as shown in FIG. 1, since the convex portion 33 is provided only on the lower core portion 34B, the upper end of the convex portion 33 is located axially lower than the upper end of the core back 32. Therefore, the axial position of the contact portion 51a of the upper tubular portion 51 is arranged below the upper end of the core back 32, and the axial length of the upper tubular portion 51 is shortened, which can contribute to weight reduction of the motor 1. .. In addition, in the upper region of the upper cylinder portion 51, the axial lower end of the rotor hub 26 can be extended downward to increase the fastening length between the rotor hub 26 and the shaft 10.
In addition, in this embodiment, the stator core 34 has illustrated the case where it has two core parts (upper core part 34A and lower core part 34B), but may have three or more core parts. In the case where the stator core 34 has three or more core portions, the protrusion 33 may be provided on at least one of the core portions. In this case, it is preferable that the core portion laminated at the bottom has the convex portion 33.

The insulating portion 39 is provided on the outer surface of the stator core 34, as shown in FIG. The insulating portion 39 is located between the stator core 34 and the coil 35. Therefore, the insulating portion 39 ensures insulation between the stator core 34 and the coil 35. The insulating portion 39 of the present embodiment is a powder coating applied to the outer surface of the stator core 34. The insulating portion 39 is applied and fixed while masking the radial outer end surface 31 a of the tooth 31, the inner peripheral surface 32 a of the core back 32, and the convex portion 33. Therefore, the outer end surface 31a of the tooth 31, the inner peripheral surface 32a of the core back 32, and the outer surface of the convex portion 33 are not covered with the insulating portion 39, and the metal surface is exposed. As shown in FIG. 1, the outer end surface 31 a of the tooth 31 faces the rotor magnet 25 of the rotor portion 20 with a minute gap therebetween. By not providing the insulating portion 39 on the outer end surface 31a, it is possible to suppress interference between the outer end surface 31a and the rotor magnet 25. Further, as shown in FIG. 1, the lower surface 33 a of the convex portion 33 contacts the first surface 52 a of the bracket 50 and determines the axial position of the stator core 34 with respect to the bracket 50. Similarly, the radial inner end 33 c of the convex portion 33 contacts the outer peripheral surface 51 b of the upper tubular portion 51 and determines the radial position of the stator core 34 with respect to the bracket 50. The metal surface is exposed without providing the insulating portion 39 on the outer surface of the convex portion 33. That is, the metal surface is exposed at the radially inner end of the protrusion 33. With this configuration, the accuracy of positioning the stator core 34 in the vertical direction and the radial direction can be improved.
The stator portion 30 may have an insulator made of a resin material instead of the insulating portion 39. Even in this case, it is preferable that the insulator does not cover the radially inner end 33c of the protrusion 33 of the stator core 34 and the lower surface 33a of the protrusion 33.

[Positioning member]
As shown in FIG. 1, the positioning member 70 is located between the stator portion 30 and the circuit board 60 in the vertical direction. The positioning member 70 positions the stator core 34, the circuit board 60, and the bracket 50 in the circumferential direction.

  FIG. 5 is a perspective view of the positioning member 70. The positioning member 70 includes an annular main body 73 that surrounds the central axis J, a plate-shaped portion 74 that extends radially outward from the outer peripheral surface of the main body 73, three upper protrusions 71, and three lower protrusions 72. Have.

  The upper protrusion 71 extends upward from the upper surface of the main body 73. The upper protrusion 71 is inserted into the second hole 36 of the stator core 34. The upper protrusion 71 fits into the second hole 36 and limits the relative movement of the positioning member 70 and the stator core 34 in the circumferential direction.

  The lower protrusion 72 extends downward from the lower surface of the main body 73. The lower protrusion 72 is inserted into the through hole 61 of the circuit board 60 and the first hole 54 of the base portion 53. The lower protrusion 72 passes through the through hole 61 of the circuit board 60 and is inserted into the first hole 54 of the base portion 53. The lower protrusion 72 is inserted into the through hole 61 as a notch extending in the radial direction, thereby limiting the relative movement of the positioning member 70 and the circuit board 60 in the circumferential direction. Similarly, the lower protrusion 72 fits into the first hole 54 and restricts the relative movement of the positioning member 70 and the bracket 50 in the circumferential direction.

  The lower protrusion 72 of the present embodiment passes through the through hole 61 of the circuit board 60 and is inserted into the first hole 54 of the base portion 53. As a result, as compared with the case where the through hole 61 of the circuit board 60 and the first hole 54 of the base portion 53 are fixed by separate lower protrusions, the positioning member 70 can be configured simply and the circuit board 60 and the base can be formed. The part 53 can be positioned in the circumferential direction.

  The three upper protrusions 71 are arranged at equal intervals along the circumferential direction centered on the central axis J (that is, at 120 ° intervals about the central axis J). Similarly, the three lower protrusions 72 are arranged at equal intervals along the circumferential direction centered on the central axis J. The positions of the upper protrusion 71 and the lower protrusion 72 in the circumferential direction of the present embodiment match each other, but they do not necessarily have to match.

  As shown in FIG. 1, the upper protrusion 71 of the present embodiment is located radially inward of the lower protrusion 72. That is, the upper protrusion 71 is arranged closer to the inner side in the radial direction. The second hole 36 into which the upper protrusion 71 is inserted is preferably arranged closer to the inner side in the radial direction of the core back 32 in order to reduce the influence on the magnetic path. By arranging the second hole 36 together with the upper protrusion 71 inward in the radial direction, the influence of the second hole 36 on the output of the motor 1 can be reduced.

  As shown in FIG. 5, the upper protrusion 71 of this embodiment has a cylindrical shape, and the second hole 36 has a circular shape that matches the cross-sectional shape of the upper protrusion 71. Similarly, in the present embodiment, the lower protrusion 72 has a cylindrical shape, and the first hole 54 has a circular shape that matches the cross-sectional shape of the lower protrusion 72. Furthermore, the through hole 61 is a notch that surrounds the lower protrusion 72 in three directions. However, the shapes of the upper protrusion 71 and the lower protrusion 72, and the first hole 54, the second hole 36, and the through hole 61 are not limited to the present embodiment. These may be those that limit relative movement in the circumferential direction. For example, the first hole 54 and the second hole 36 may be elongated holes extending in the radial direction.

  The positioning member 70 preferably has three or more upper protrusions 71. Further, the stator core 34 is preferably provided with three or more second holes 36 into which the upper protrusions 71 are respectively inserted. Similarly, the positioning member 70 preferably has three or more lower protrusions 72. Further, it is preferable that the circuit board 60 is provided with three or more through holes 61, the base portion 53 is provided with three or more first holes 54, and the lower protrusions 72 are respectively inserted therein. With this configuration, it is possible to achieve stable circumferential positioning around the central axis J at three or more points.

  The plate-shaped portion 74 is a flange provided on the entire outer peripheral surface of the main body portion 73. The plate-shaped portion 74 has six notches (coil wire support portions) 75 provided at intervals in the circumferential direction. That is, the positioning member 70 has a plurality of notches (coil wire support portions) 75 located on the outer peripheral surface of the main body portion 73. The notches 75 are arranged at equal intervals in the circumferential direction with respect to the central axis J. The notch 75 opens radially outward in the outer peripheral edge of the plate-shaped portion 74. The cutout 75 has a hook shape in a plan view. The notch 75 has a radial portion 75a extending radially inward from the outer peripheral edge of the plate portion 74, and a circumferential portion 75b extending from the inner end of the radial portion 75a to one circumferential side. Further, the circumferential direction portion 75b is provided with a retaining protrusion 75c that narrows the width of the cutout to a wire diameter of the coil wire 35a or less in plan view. That is, the notch 75 has the retaining protrusion 75c.

  The cutout 75 supports the coil wire 35 a extending from the coil 35 of the stator portion 30 to the circuit board 60. Since the notch 75 supports the coil wire 35a, the plurality of coil wires 35a can be easily routed in the assembly process.

  In the assembling process, the coil wire 35a is inserted into the radial portion 75a of the cutout 75 from the outer peripheral side of the plate-shaped portion 74 and is further guided to the circumferential portion 75b. When the coil wire 35a is guided to the circumferential portion 75b, the coil wire 35a gets over the retaining projection 75c and is supported inside the notch 75. By providing the retaining protrusion 75c, it is possible to make it difficult for the coil wire 35a to be detached from the inside of the notch 75.

  The circumferential portion 75b of the cutout 75 is provided at a position overlapping the coil wire through hole 68 provided in the substrate body 62 in plan view. The coil wire 35 a extending downward from the coil 35 is supported by the notch 75, penetrates the coil wire through hole 68, and is soldered and fixed to the lower surface of the circuit board 60. Since the circumferential direction portion 75b overlaps the coil wire through hole 68, the coil wire 35a supported by the circumferential direction portion 75b of the cutout 75 extends linearly downward and is inserted into the coil wire through hole 68. Therefore, the slack of the coil wire 35a supported by the notch 75 can be suppressed.

  The positioning member 70 of the present embodiment is provided with the notches 75 as the coil wire support portions, but the coil wire support portions are not limited to the notches 75 as long as they can support the coil wire 35a. For example, as the coil wire support portion, a claw protruding radially outward from the outer peripheral surface of the main body portion 73 and gripping the coil wire 35a may be provided.

  As shown in FIG. 5, the axial length of the plate portion 74 is shorter than the axial length of the main body portion 73. Further, as shown in FIG. 1, the axial distance D1 between the plate-shaped portion 74 and the stator core 34 is longer than the axial distance D2 between the plate-shaped portion 74 and the circuit board 60. As a result, the distance between the stator core 34 and the plate-shaped portion 74 can be ensured, and the work of inserting the coil wire 35a into the cutout 75 of the plate-shaped portion 74 can be facilitated. Further, contact between the coil 35 and the plate-shaped portion 74 can be reduced. In addition, the plate-shaped portion 74 and the circuit board 60 are made closer to each other, so that the coil wire 35a can be easily pulled from the notch 75 to the circuit board 60 without slack. As a result, the ease of soldering the coil wire 35a to the circuit board 60 is enhanced.

[Assembling procedure]
An example of the assembly procedure of the motor 1 of this embodiment will be described with reference to FIG.
First, the upper core portion 34A and the lower core portion 34B are stacked in the vertical direction and fixed to each other by welding or the like to manufacture the stator core 34.
Next, powder coating is applied to the outer surface of the stator core 34 to form the insulating portion 39.
Next, the coil wire 35 a is wound around the teeth 31 of the stator core 34 to form the coil 35, and thus the stator portion 30 is manufactured.

  Next, the positioning member 70 is attached to the stator portion 30. Specifically, the upper protrusion 71 of the positioning member 70 is inserted into the second hole 36 of the stator core 34, and the coil wire 35a is inserted into the notch 75 of the positioning member 70 as shown in FIG.

  Next, the lower protrusion 72 of the positioning member 70 is inserted into the through hole 61 of the circuit board 60. Further, the tip of the coil wire 35a is inserted into the coil wire through hole 68 (see FIG. 2) of the board main body 62 and soldered on the lower surface of the board. At this time, since the coil wire 35a is supported by the notch 75, the coil wire 35a can be easily inserted into the coil wire through hole 68.

  Next, the bracket 50 is assembled. The upper cylinder portion 51 of the bracket 50 is inserted into the stator portion 30. At this time, the outer peripheral surface 51b of the upper tubular portion 51 is brought into contact with the radially inner end 33c of the convex portion 33, and the lower surface 33a of the convex portion 33 is brought into contact with the first surface 52a of the bracket 50. At the same time, the lower protrusion 72 of the positioning member 70 is inserted into the first hole 54 of the base portion 53. In addition, at the same time, the boss portions 56a, 57a, 58a of the bracket 50 shown in FIG. 2 are inserted into the fixing holes 66 of the substrate body.

  Next, the tip of the upper tubular portion 51 of the bracket 50 is caulked to form a contact portion 51a, and the bracket 50 and the stator portion 30 are fixed. The lower bearing portion 42 is attached to the bracket 50 in advance.

Next, the tips of the boss portions 56a, 57a, 58a of the bracket 50 are caulked to form the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58. The boss portions 56a, 57a, 58a are arranged outside the outer end (outer end surface 31a) of the stator portion 30 in a plan view. Therefore, the caulking process can be easily performed by applying the caulking tool to the boss portions 56a, 57a, 58a from above. The bracket 50 and the circuit board 60 are fixed by forming the first fixing portion 56, the second fixing portion 57, and the third fixing portion 58 by crimping.
The semi-assembled product on the side of the stator is manufactured through the above procedure.

On the other hand, a semi-assembled product on the rotor side is manufactured. An unmagnetized rotor magnet 25 is fixedly adhered to the rotor holder 24.
Next, the rotor hub 26 is assembled to the rotor holder 24 and fixed by caulking, and the shaft 10 is press-fitted into the rotor hub 26.
Then, the rotor magnet 25 is magnetized.
Then, the upper bearing portion 41 is press-fitted into the shaft 10.
Through the above procedure, a semi-assembled product on the rotor side is manufactured.

Next, the semi-assembled product on the rotor side is assembled to the semi-assembled product on the stator side. This assembling step is performed by press-fitting the shaft 10 into the lower bearing portion 42.
The assembly of the motor 1 is completed through the above procedure.

[Modification 1]
Next, a stator portion 130 of Modification 1 (second embodiment) that can be used in the above-described motor 1 will be described based on FIG. 6. The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.
FIG. 6 is a perspective view of the stator part 130, the bracket 50 to which the stator part 130 is assembled, and peripheral members. In FIG. 6, the coils of the stator section 130 are not shown. The stator part 130 has a stator core 134, a coil (not shown), and an insulating part 139 provided on the outer surface of the stator core 134, as in the above-described embodiment. The stator core 134 has an annular core back 132 and twelve teeth 131 extending radially outward of the core back 132. The inner peripheral surface 132a of the core back 132 is provided with three protrusions 133 that protrude inward in the radial direction.

  Compared with the above-mentioned embodiment, the stator part 130 of this modification is different in that the stator core 134 does not have a plurality of core parts. The stator core 134 of this modification has the same shape as the lower core portion 34B of the above-described embodiment. Therefore, the stator core 134 of this modification can be described as a structure in which only one layer of the core portion is laminated.

  In the motor using the stator portion 130 of this modification, the axial dimension of the stator core 134 is smaller than that of the above-described embodiment, so the winding diameter of the coil wound around the teeth 131 is also small. Therefore, the motor of the present modified example has a low output as compared with the above-described embodiment, but on the other hand, the weight of the stator core 134 is light, so that the motor as a whole is also lightweight. Further, in the motor of the modification, since the axial dimension of the stator portion 130 is small, the axial dimension can be reduced. According to the present modified example and the above-described embodiment, by changing the number of laminated core portions that form the stator core, it is possible to easily configure a motor in which the components such as the bracket 50 are shared and the output and weight are adjusted. it can.

[Modification 2]
Next, a bracket 50 and a stator portion 30 of a modified example 2 (third embodiment) that can be adopted in the motor 1 described above will be described based on FIG. 7. The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. The coils are not shown in FIG. 7.

  As shown in FIG. 7, the upper cylinder portion 51 of the bracket 50 has a cylindrical shape extending along the central axis J. The upper cylinder portion 51 has a contact portion 51a, a contact support portion 51c located below the contact portion 51a, and a recess portion 51d that is recessed axially below the contact portion 51a. The contact support portions 51c and the depressions 51d are alternately arranged in the circumferential direction. In this embodiment, the numbers of the contact portions 51a, the contact support portions 51c, and the recess portions 51d are each three.

  The inner peripheral surface 32a of the core back 32 is provided with three convex portions 33 that protrude inward in the radial direction. The respective convex portions 33 are arranged at equal intervals in the circumferential direction. In plan view, the respective circumferential positions of the respective convex portions 33 overlap the respective contact support portions 51c. In the core back 32 of the present embodiment, between the convex portion 33 and the convex portion 33, a wide portion 37 that projects radially inward from a narrow portion 38 described later and a radial outer side than the wide portion 37. And a narrow portion 38 located therein. The inner peripheral edge of the wide portion 37 and the inner peripheral edge of the narrow portion 38 are both located radially outside the inner peripheral edge of the convex portion 33. The wide portions 37 are arranged in a line across the teeth 31 adjacent to each other in a plan view. By connecting the plurality of teeth 31 with the wide portion 37, the strength of the core back 32 can be increased. Further, the core back 32 can be reduced in weight by having the narrow portion 38. As described above, since the core back 32 has the wide portion 37 and the narrow portion 38, it is possible to improve the strength and reduce the weight of the stator portion 30 at the same time. Further, on the inner peripheral surface of the convex portion 33, a groove portion 33d that is recessed radially outward is located.

  Further, in the present embodiment, the stator core 34 is not divided into 34A and 34B. That is, the convex portion 33 exists over the entire area of the stator core 34 in the axial direction. As a result, the strength of the stator can be increased.

  The radial inner end 33c of the convex portion 33 has an arc shape along the outer peripheral surface 51b of the upper tubular portion 51 in a plan view. The radially inner end 33c of the convex portion 33 contacts the outer peripheral surface 51b of the upper tubular portion 51. This determines the radial position of the stator core 34 with respect to the bracket 50.

  The lower surface 33a of the convex portion 33 contacts the first surface 52a located between the upper cylinder portion 51 and the lower cylinder portion 52. Further, a contact portion 51 a that comes into contact with the upper surface 33 b of the convex portion 33 is provided at the upper end of the upper tubular portion 51, and the stator core 34 is fixed to the bracket 50. When the lower surface 33a of the convex portion 33 contacts the first surface 52a, the height direction position of the stator core 34 with respect to the bracket 50 is determined. In the present embodiment, the contact portion 51a is supported by the contact support portion 51c located below the contact portion 51a, and the contact support portion 51c and the recess 51d are alternately arranged in the circumferential direction. .. Therefore, when the bracket 50 is caulked to form the contact portion 51a and the bracket 50 and the stator core 30 are fixed, even if the contact portion 51a and the contact support portion 51c are distorted, the contact support portions 51c are recessed. The portions 51d are separated from each other. Thereby, the distortion of each contact support part 51c does not affect other contact support parts 51c. Further, since the distortion due to the crimping is suppressed to the upper side of the upper cylinder portion 51, the deformation of the bearing holding hole 59 of the bracket 50 can be suppressed, and the shaft 10 is prevented from being inclined and fixed with respect to the bracket 50. be able to.

[Modification 3]
Next, a bracket 50 of Modification 3 (fourth embodiment) that can be used in the above-described motor 1 will be described with reference to FIGS. 8 and 9. The same components as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

  The radially inner end 33c of the convex portion 33 has an arc shape along the outer peripheral surface 51b of the upper tubular portion 51 in a plan view. The radially inner end 33c of the convex portion 33 contacts the outer peripheral surface 51b of the upper tubular portion 51. This determines the radial position of the stator core 34 with respect to the bracket 50.

  As in the second modification, a groove portion 33d that is recessed radially outward is located on the inner peripheral surface of the convex portion 33. In the present embodiment, a bulging portion 51e that bulges outward in the radial direction is located on the outer peripheral surface of the bracket 50. Then, the groove portion 33d and the bulging portion 51e come into contact with each other. This prevents the stator core 34 from moving in the circumferential direction with respect to the bracket 50. Further, the circumferential position of the stator core 34 with respect to the bracket 50 is determined. Here, the stator core 34 is fixed to the bracket 50 with an adhesive. With the configuration having the groove portion 33d and the bulging portion 51e, the surface area on which the adhesive is applied increases, so that the fixing strength can be improved. In the present embodiment, the bulging portion 51e has a height of about one third in the axial direction of the stator core 34.

  In the present embodiment, the stator core 34 and the bracket 50 are fixed by an adhesive agent interposed between the radially inner end 33c of the convex portion 33 of the stator core 34 and the outer peripheral surface of the bracket 50. That is, the tubular portion and the stator are fixed by an adhesive agent interposed between the outer peripheral surface of the tubular portion and the stator. As a result, the stator core 34 and the bracket 50 can be fixed without the bracket 50 being distorted. Therefore, the deformation of the bearing holding hole 59 of the bracket 50 can be suppressed, and the shaft 10 can be prevented from being inclined and fixed with respect to the bracket 50.

In the core back 32 of the present embodiment, between the convex portion 33 and the convex portion 33, a wide portion 37 that projects inward in the radial direction, and a narrow portion 38 that is located radially outward of the wide portion 37, Have. As shown in FIG. 9, in the present embodiment, the wide portion 37 is arranged so as to be connected to the convex portion 33. As a result, the strength of the stator core 34 can be increased.
Further, in the present embodiment, similarly to the second modification, the stator core 34 is not divided into 34A and 34B. That is, the convex portion 33 exists over the entire area of the stator core 34 in the axial direction. As a result, the strength of the stator can be increased. Moreover, since the axial length of the convex portion 33 can be increased, the bonding area between the stator core 34 and the bracket 50 can be increased. Thereby, the fixing strength of the stator core 34 to the bracket 50 can be strengthened.

  Although the embodiments of the present invention have been described above, the configurations and combinations thereof are merely examples, and additions, omissions, substitutions, and other modifications of the configurations are possible without departing from the spirit of the present invention. Is. The present invention is not limited to the embodiments.

DESCRIPTION OF SYMBOLS 1 ... Motor, 9 ... External wiring, 10 ... Shaft, 20 ... Rotor part, 24 ... Rotor holder, 25 ... Rotor magnet, 26 ... Rotor hub, 30, 130 ... Stator part, 31, 131 ... Teeth, 32, 132 ... Core back , 32a, 132a ... inner peripheral surface, 33, 133 ... convex portion, 33a ... lower surface, 33b ... upper surface, 33c ... radial inner end, 34, 134 ... stator core, 34A ... upper core portion, 34B ... lower core portion, 35 ... Coil, 35a ... Coil wire, 36 ... 2nd hole, 39, 139 ... Insulation part, 41 ... Upper bearing part (bearing part), 42 ... Lower bearing part, 50 ... Bracket, 51 ... Upper cylinder part ( Cylinder part), 51a ... contact part, 52 ... lower cylinder part, 52a ... first surface, 53 ... base part, 53a ... flat plate part, 53c ... second pedestal part, 53d ... first pedestal part, 53e ... second Surface, 54 ... first hole 56 ... 1st fixed part, 57 ... 2nd fixed part, 58 ... 3rd fixed part, 59 ... Bearing holding hole, 60 ... Circuit board, 61 ... Through hole, 62 ... Board main body, 63a, 63b, 63c ... Rotation sensor , 65 ... Wiring connection portion, 65a ... One edge, 65b ... Other edge, 68 ... Coil wire through hole, 70 ... Positioning member, 71 ... Upper protrusion, 72 ... Lower protrusion, 73 ... Main body portion, 74 ... Plate portion , 75 ... notches (coil wire support), 75c ... retaining projection, J ... central axis

Claims (11)

A shaft arranged along a central axis extending in the vertical direction,
A rotor unit having a rotor magnet and rotating together with the shaft;
A bracket having a tubular portion that surrounds the outer peripheral surface of the shaft and a first surface that extends radially outward from the lower end of the tubular portion;
A bearing portion located between the inner peripheral surface of the tubular portion and the outer peripheral surface of the shaft,
A stator portion having a stator core and a coil and surrounding the outer peripheral surface of the tubular portion;
The stator core has an annular core back and teeth extending radially outward of the core back,
The inner peripheral surface of the core back is provided with a plurality of convex portions protruding inward in the radial direction,
The radial inner end of the convex portion contacts the outer peripheral surface of the tubular portion,
The lower surface of the convex portion is in contact with the first surface,
On the inner peripheral surface of the convex portion, a groove portion that is recessed radially outward is located,
A bulging portion that bulges outward in the radial direction is located on the outer peripheral surface of the tubular portion of the bracket,
A motor in which the groove and the bulge contact each other . The motor according to claim 1, wherein a caulking portion that comes into contact with an upper surface of the convex portion is provided at an upper end of the cylindrical portion. In the region axially above the bearing portion of the tubular portion,
The tubular portion has said crimped portion, and a caulked portion support portion positioned on the lower side of the crimping portion, and a recess recessed in the axial direction lower side of the crimping portion,
The motor according to claim 2. The stator portion has an insulating portion located between the stator core and the coil,
The motor according to any one of claims 1 to 3, wherein a metal surface is exposed at a radially inner end of the convex portion.   The motor according to claim 1, wherein an axial length of the convex portion is shorter than an axial length of the core back.   The motor according to claim 1, wherein an upper end of the convex portion is located axially lower than an upper end of the core back. The rotor portion further includes a rotor holder that holds the rotor magnet, and a rotor hub that connects a radial inner end of the rotor holder and the shaft,
An axial lower end of the rotor hub is located axially lower than an upper end of the core back,
The motor according to any one of claims 1 to 6.   The said stator core has a some core part laminated | stacked and mutually fixed by the axial direction, and the said convex part is provided in at least 1 of the said core parts, The any one of Claims 5-7. Motor.   The motor according to claim 1, wherein the plurality of adjacent convex portions have a gap in the circumferential direction.   The motor according to any one of claims 1 to 9, wherein three convex portions are provided on the inner peripheral surface of the core back at equal intervals in the circumferential direction. The motor according to claim 1, wherein the tubular portion and the stator portion are fixed by an adhesive interposed between the outer peripheral surface of the tubular portion and the stator portion.

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