JP6229331B2 - motor - Google Patents

Description

  The present invention relates to an inner rotor type motor.

  In the inner rotor type motor, when the length of the motor in the axial direction is long, a motor having a structure in which bearings are arranged on the upper side and the lower side of the armature has been widely used.

  In this type of motor, it is necessary to attach brackets for supporting the bearings above and below the armature.

  In Patent Document 1, the lid bodies 5 and 6 and the annular stator 1 are fastened to each other by a fixing screw 7 that penetrates the annular stator 1 in the axial direction.

In Patent Document 2, a metal core 9 having high thermal conductivity, a rivet 10 and a burring 11 are passed through a hole 8 to attach a stator core 13 and a base 16. At that time, an insulator 14 that is an insulator, that is, a convex portion 17 is provided between the metal part and the winding 5 so as not to contact each other.
Patent-3862844 JP 2001-136699 A

  When providing the screw hole which penetrates a stator like patent document 1, it may provide in the outer end of teeth like cited reference 2, respectively. At this time, insulation is achieved by providing a convex portion of the insulator between the winding and the screw.

  However, when the winding and the screw hole are close to each other in the radial direction, the thickness of the convex portion of the insulator is reduced. When the insulator is thinly provided, the rigidity is weakened. When the winding is wound, the insulator comes into contact with the protrusion, and the protrusion swells radially outward. There is a concern that the convex portion bulging outward in the radial direction may prevent insertion of a fixing member such as a screw. Moreover, when the fixing member is inserted, there is a concern that the convex portion of the insulator comes into contact with the convex portion of the insulator and the convex portion of the insulator is damaged.

  The present invention has been made in view of the above problems, and an object of the present invention is to suppress contact between a winding and a fixing member in a motor.

A motor according to a first aspect of the present invention has a shaft that is rotatably supported by a bearing member around a central axis that extends vertically, a rotor magnet that rotates together with the shaft, and a radially outer side of the rotor magnet. An armature that is positioned; an upper bracket that is disposed on the upper side in the axial direction of the armature, and that supports an upper bearing that rotatably supports the shaft in the radial center; and is disposed on the lower side in the axial direction of the armature. A lower bracket that holds a lower bearing that rotatably supports the shaft in the center of the direction, and a fixing member that extends vertically and fixes the armature to the upper bracket and the lower bracket. A stator core comprising: a core back; and a plurality of magnetic pole teeth protruding radially inward from the core back; and at least one of the magnetic pole teeth of the stator core An insulator that covers a surface and a lower surface, and a coil that is configured by winding a conductive wire around the magnetic pole teeth via the insulator, and the insulator includes a magnetic pole tooth insulating portion that covers the magnetic pole teeth, and A core back insulating portion that is connected to the magnetic pole tooth insulating portion and covers at least a part of the upper and lower end surfaces of the core back, and the core back insulating protruding portion is positioned on a radially outer side of the magnetic pole tooth insulating portion The stator core is a through-hole through which the fixing member penetrates in the axial direction or a notch that is recessed from the outside in the radial direction toward the inside in the radial direction outward of the magnetic pole teeth. The core back insulating portion further protrudes in a direction away from the surface covering the core back in the axial direction, and a radially inner surface is radially inward from a radially inner end of the fixing member arranging portion. Comprising a core-back insulating protrusion that location, of the core-back insulating protrusions, the portion facing the fixed member and the radial direction Ri notch there was cut out, the circumferential ends of the cutout, the coil guide walls are disposed, the radial inner surface and the coil of the coil guide walls that are in contact.

  According to the present invention, in the motor, contact between the winding and the fixing member can be suppressed.

FIG. 1 is an external perspective view of a motor. FIG. 2 is a sectional view of the motor. FIG. 3 is an external perspective view of the motor with the upper bracket removed. FIG. 4 is an external perspective view of the motor with the upper bracket and circuit board removed. FIG. 5 is a perspective view of the upper bracket. FIG. 6 is a perspective view of the lower bracket. FIG. 7 is a plan view of the lower insulator and the stator core. FIG. 8 is an external perspective view of the motor with the lower bracket removed.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. Below, let the direction along the central axis of a motor be an up-down direction. The shape and positional relationship of each part will be described with the circuit board side facing up with respect to the stator core. However, this defines the vertical direction for the convenience of explanation, and does not limit the posture when the motor according to the present invention is used.

<1. Overall configuration of motor>
The motor of this embodiment is mounted on household appliances, such as an air conditioner, an air cleaner, and a refrigerator, and is used as a drive source of a fan or a pump, for example. It is also used as a drive source for industrial equipment such as sorters. However, the motor of the present invention may be a motor used for other purposes. For example, the motor of the present invention may be mounted on an OA (Office Automation) device, a medical device, an automobile, or the like and generate various driving forces. Hereinafter, a device on which the motor 1 is mounted is referred to as a “drive device”.

  FIG. 1 is an external perspective view of a motor 1 according to the present embodiment. FIG. 2 is a cross-sectional view of the motor 1. As shown in FIGS. 1 and 2, the motor 1 includes a stationary part 2 and a rotating part 3. The stationary part 2 is fixed to a frame of a driving device (not shown). The rotating unit 3 is supported so as to be rotatable with respect to the stationary unit 2.

  The stationary portion 2 of the present embodiment includes an upper bracket 21, a lower bracket 22, a stator core 23, a coil 24, an upper insulator 25, a lower insulator 26, a circuit board 27, and a bearing portion 28.

  The upper bracket 21 holds the stator core 23 and the bearing portion 28 (upper bearing 281). More specifically, the upper bracket 21 comes into contact with the circuit board 27 and is fixed to the lower bracket 22 by a plurality of fixing members 61, thereby sandwiching and holding the stator core 23. The upper bracket 21 has a substantially cylindrical shape with a lid. The upper bracket 21 is a metal member. The upper bracket 21 is obtained by a so-called die casting method in which a metal containing zinc as a main component is melted and poured into a mold. In addition, the kind of metal is not restricted to zinc, You may use aluminum and other metals. Further, the manufacturing method may be processed by other processing methods such as a press method instead of the die casting method. The upper bracket 21 may be made of resin instead of metal.

  The lower bracket 22 holds the stator core 23 and the bearing portion 28 (lower bearing 282). The lower bracket 22 has a substantially cylindrical shape with a bottom. The lower bracket 22 is a metal member. The lower lid 221 is provided with a plurality of holes in the circumferential direction (not shown). By inserting a screw into the hole, the motor 1 and the driving device are fixed.

  The lower bracket 22 is obtained by a so-called die casting method in which a metal containing zinc as a main component is melted and poured into a mold. In addition, the kind of metal is not restricted to zinc, You may use aluminum and other metals. Further, the manufacturing method may be processed by other processing methods such as a press method instead of the die casting method. The upper bracket 21 may be made of resin instead of metal. Moreover, in this embodiment, the stator core 23 and the bearing part 28 (lower bearing 282) are hold | maintained with the lower bracket 22 which is a single member. For this reason, the stator core 23 and the shaft 31 described later can be positioned with high accuracy.

  The stator core 23 and the coil 24 are parts that function as an armature of the motor 1. The stator core 23 is made of a laminated steel plate in which electromagnetic steel plates such as silicon steel plates are laminated in the axial direction (direction along the central axis J1, hereinafter the same). The stator core 23 has an annular core back 231 and a plurality of magnetic pole teeth 232 protruding from the core back 231 toward the inside in the radial direction. The core back 231 is held by being sandwiched between the upper bracket 21 and the lower bracket 22. The outer peripheral surface of the core back 231 becomes the outer peripheral surface of the motor 1 except for the upper part in the axial direction and the lower part in the axial direction. The circumferential width of the portion around which the coil 24 of each magnetic pole tooth 232 of the stator core 23 is wound is not more than twice the radial width of the core back 231. In the present embodiment, the number of magnetic pole teeth 232 is six.

  Here, the outer peripheral surface of the stator core 23 is not covered with the lower bracket 22 and the upper bracket 21 except for the vicinity of the upper end and the vicinity of the lower end, and is exposed from the lower bracket 22 and the upper bracket 21. That is, compared with the case where the entire outer peripheral surface of the stator core 23 is covered with the lower bracket 22 and the upper bracket 21, in the present embodiment, the radial facing area between the outer peripheral surface of the stator core 23 and the lower bracket 22 and the upper bracket 21 is smaller. small. For this reason, even if the lower bracket 22 and the upper bracket 21 are magnetic bodies, magnetic flux leakage from the outer peripheral surface of the stator core 23 to the lower bracket 22 and the upper bracket 21 hardly occurs. Therefore, iron loss due to the lower bracket 22 and the upper bracket 21 can be reduced, and the energy efficiency of the motor 1 can be improved.

  Through holes 233 are formed at the boundaries between several core backs 231 and magnetic pole teeth 232 of the stator core 23. In the present embodiment, the number of through holes 233 is three. The through holes 233 are desirably arranged at equal intervals in the circumferential direction around the central axis. In the present embodiment, the through holes 233 are arranged with an interval of 120 degrees when viewed from the central axis. The through hole 233 is not limited to this, and may be a groove recessed inward in the radial direction. A fixing member 61 described later passes through the through hole 233.

  A longitudinal groove 234 extending in the axial direction is formed on the outer peripheral surface of the stator core 23. The protrusion 216 of the upper bracket 21 and the protrusion 228 of the lower bracket 22 are inserted or fitted into the vertical groove 234. As a result, the upper bracket 21 and the lower bracket 22 are positioned in the radial direction and the circumferential direction.

  The coil 24 is configured by a conductive wire wound around the magnetic pole teeth 232. The coil 24 is wound around the magnetic pole teeth 232 via an insulator. In this embodiment, the conducting wire is connected by so-called star connection. Therefore, four ends of the U phase, the V phase, the W phase, and the common are drawn out from the coil 24. Each drawn end is soldered to the circuit board 27. When a drive current is applied to the coil 24 via the circuit board 27, a magnetic flux in the radial direction is generated in the magnetic pole teeth 232 that are the magnetic core. Then, circumferential torque is generated by the action of the magnetic flux between the magnetic pole teeth 232 and the rotor magnet 33 on the rotating unit 3 side. As a result, the rotating unit 3 rotates about the central axis J1 with respect to the stationary unit 2.

  The upper insulator 25 and the lower insulator 26 are resin members that electrically insulate the stator core 23 and the coil 24 from each other. The upper insulator 25 is disposed on the upper side of the stator core 23. The lower insulator 26 is disposed below the stator core 23. In other words, the stator core 23 is sandwiched between the upper insulator 25 and the lower insulator 26. The upper insulator 25 covers the upper surface of the magnetic pole teeth 232. The lower insulator 26 covers the lower surface of the magnetic pole teeth 232. The upper insulator 25 and the lower insulator 26 cover the side surfaces of the magnetic pole teeth 232. The upper insulator 25 and the lower insulator 26 constitute an insulator. In the present embodiment, the coil 24 is wound around the magnetic pole teeth 232 from above the upper insulator 25 and the lower insulator 26, so that the insulator is fixed to the stator core 23.

  The upper insulator 25 and the lower insulator 26 have a portion that is interposed between the magnetic pole teeth 232 and the coil 24 and electrically insulates the magnetic pole teeth 232 and the coil 24. Further, the upper insulator 25 has an annular core back insulating portion 252 that is continuous in the circumferential direction outside the coil 24 in the radial direction. The core back insulating part 252 is disposed on the radially outer side of the coil 24. The core back insulating part 252 is a part that insulates from other members when the coil 24 collapses. An assembly of the stator core 23, the coil 24, the upper insulator 25, and the lower insulator 26 is defined as an armature 29. Details of the upper insulator 25 and the lower insulator 26 will be described later.

  FIG. 3 is an external perspective view of the motor 1 according to this embodiment with the upper bracket 21 removed. Referring to FIG. 3, circuit board 27 is a board having wiring for applying a drive current to coil 24 from an external power source. The circuit board 27 has a substantially disk shape in plan view. The outer shape of the circuit board 27 substantially matches the outer shape of the upper insulator 25 described later. The circuit board 27 is fixed on a seating surface 2531 that is an upper surface of the upper insulator 25. Further, a magnetic sensor 271 for detecting the number of rotations of the rotating unit 3 is provided on the lower surface of the circuit board 27. For the magnetic sensor 271, for example, a Hall element is used.

  With reference to FIG. 2, the bearing portion 28 is a member that rotatably supports the shaft 31 of the rotating portion 3. The bearing portion 28 includes an upper bearing 281 and a lower bearing 282. The upper bearing 281 is held on the inner peripheral surface 2121 of the holding portion 212 of the upper bracket 21. The lower bearing 282 is held by the lower bracket 22. For the bearing portion 28, for example, a ball bearing that relatively rotates an outer ring and an inner ring via a sphere is used. However, another type of bearing such as a slide bearing or a fluid bearing may be used for the bearing portion 28.

  The rotating unit 3 of this embodiment includes a shaft 31, a rotor holder 32, and a rotor magnet 33. The shaft 31 is a substantially cylindrical member extending in the vertical direction along the central axis J1. The shaft 31 rotates about the central axis J1 while being supported by the bearing portion 28 described above. The lower end portion of the shaft 31 protrudes downward from the lower bracket 22. Further, the upper end portion of the shaft 31 protrudes above the circuit board 27. A lower end portion or an upper end portion of the shaft 31 is connected to a drive unit of the drive device via a power transmission mechanism such as a gear. However, the drive unit of the drive device may be directly driven by the shaft 31.

  The rotor holder 32 is a member that rotates together with the shaft 31 on the radially inner side of the stator core 23 and the coil 24. The rotor holder 32 of the present embodiment is made of free-cutting steel. The rotor holder 32 is formed by cutting. The rotor holder 32 has a substantially H-shaped cross section, and has a central part 321 and a cylindrical part 322. The central portion 321 is located in the center of the rotor holder 32 in the axial direction, and the shaft 31 is press-fitted into the inner peripheral surface thereof. The cylindrical portion 322 is a substantially cylindrical portion that is located on the radially outer side of the central portion 321 and extends to the upper side and the lower side of the central portion 321 in the axial direction.

  In the present embodiment, the rotor holder 32 has a substantially H-shaped cross section, but is not limited thereto. The shape of the rotor holder 32 may be a simple cylindrical shape. The shape of the rotor holder 32 may be a substantially cylindrical shape with a lid, and may be obtained by pressing. Moreover, you may obtain the rotor holder 32 by laminating | stacking a magnetic steel plate. Further, the rotor holder 32 may be obtained by sintering. Further, the rotor holder 32 may be obtained by combining a member obtained by laminating magnetic steel plates and a member obtained by press working with a substantially cylindrical shape with a lid. In the present embodiment, a so-called SPM type (Surface-permanent magnet) is also available. However, the present invention is not limited to this. The rotor may be a so-called IPM type (Interior permanent-magnet, embedded magnet type). In the case of an IPM type rotor, the rotor holder 32 is preferably obtained by laminating magnetic steel plates.

  The rotor magnet 33 has a cylindrical shape and is fixed to the outer peripheral surface of the cylindrical portion 322 of the rotor holder 32. The radially outer surface of the rotor magnet 33 is a magnetic pole surface that faces the stator core 23 and the coil 24 in the radial direction. The rotor magnet 33 is magnetized so that the N-pole magnetic pole surface and the S-pole magnetic pole surface are alternately arranged in the circumferential direction. In addition, about the rotor magnet 33, it may replace with a cylindrical magnet and may arrange | position a several magnet so that a north-pole and a south pole may be located in a line by the circumferential direction. Further, as described above, an IPM type rotor may be used, and the rotor magnet 33 may be embedded in the rotor holder 32.

<2. About circuit boards>
FIG. 4 is an external perspective view of the motor 1 according to this embodiment with the upper bracket 21 and the circuit board 27 removed. Referring to FIGS. 3 and 4, circuit board 27 has a substantially disc shape in plan view. The outer peripheral surface of the circuit board 27 is provided with a notch that is recessed radially inward from the outer periphery. This notch is a positioning portion 272. In the present embodiment, the positioning part 272 constitutes a part of the transmission part. A positioning convex portion 254 of the upper insulator 25 described later is inserted into the positioning portion 272. Thereby, when the circuit board 27 tries to move relative to the upper insulator 25, the convex portion 254 contacts the positioning portion 272, and the movement is restricted. As a result, it is possible to accurately position the upper insulator 25 and the circuit board 27 in the circumferential direction and the radial direction. The positioning portion 272 is positioned at the positioning width narrow portion 2721 having a short notch radial width and the circumferential center of the positioning width narrow portion 2721, and the notch radial width is wider than the positioning width narrow portion 2721. And a wide positioning portion 2722. More specifically, the positioning convex portion 254 is inserted into the positioning width narrow portion 2721. Note that the positioning portion 272 may be a through hole. Further, the end of the conductive wire of the coil 24 passes through the positioning portion 272 and is drawn out to the upper surface of the circuit board 27 and soldered to a land provided on the upper surface of the circuit board 27.

  A connector 273 is provided on the upper surface of the circuit board 27. The motor 1 obtains a drive current via the connector 273.

  In addition, a cutout that is recessed radially outward from the outer periphery is provided on the outer peripheral surface of the circuit board 27. This notch is a buttock insertion portion 274. The collar insertion part 274 constitutes a part of the transmission part. A collar part 255 of the upper insulator 25 described later is inserted into the collar part insertion part 274. The buttock insertion portion 274 is located adjacent to the buttock insertion width narrow portion 2741 having a shorter notch radial width, and the radial direction than the buttock insertion width narrow portion 2741. And a wide flange insertion portion 2742 having a large width. More specifically, the collar part 255 is inserted into the collar part insertion width narrow part 2741.

  In addition, a cutout that is recessed radially outward from the outer periphery is provided on the outer peripheral surface of the circuit board 27. This notch is a fixing member insertion portion 275. The fixing member insertion portion 275 has a surface corresponding to a projection shape in a plan view of a screw portion of a fixing member (screw 61) described later.

  A central opening 276 that opens in the axial direction is located in the center of the circuit board 27. A shaft 31, a holding portion 212 of the upper bracket 21 to be described later, and an upper bearing 281 are located inside the central opening in the radial direction.

  It is necessary to dispose the wiring pattern at a certain distance from the edge of the circuit board 27. Therefore, the wiring area of the circuit board 27 can be increased as the number of holes and notches provided in the circuit board 27 is smaller. In the present embodiment, a portion for inserting a convex portion such as the positioning portion 272 and the collar portion insertion portion 274 (transmission portion) is enlarged to form a cutout for conducting wire. Thereby, the wiring area of the circuit board 27 can be increased.

  Especially when mounting large electronic components such as control ICs, AC-DC converters, encoders, connectors, etc. on the circuit board, or when increasing the width of the wiring pattern in order to pass a large current through the board, the area of the circuit board itself is reduced. This technique is useful when it is necessary to do so.

<3. About upper bracket and upper insulator ＞
First, the upper bracket 21 will be described in detail. FIG. 5 is a perspective view of the upper bracket 21. With reference to FIGS. 2 to 5, the upper bracket 21 has a lid portion 211, a holding portion 212, a protruding portion 213, a through hole 214, and an opening 215. The lid portion 211 has a flat plate shape and is positioned on the upper side in the axial direction of the circuit board 27. The holding part 212 is a concave part that is located on the inner side in the radial direction of the lid part 211 and opens toward the lower side in the axial direction. The holding part 212 has a cylindrical inner peripheral surface 2121 and an annular top surface 2122. The inner peripheral surface 2121 is in contact with the outer peripheral surface of the outer ring of the upper bearing 281. The top surface 2122 is in contact with the upper end surface of the outer ring of the upper bearing 281. Thereby, the holding part 212 holds the upper bearing 281. Further, the outer peripheral surface of the holding part 212 is smaller than the diameter of the central opening 276 of the circuit board 27. In addition, the lower end in the axial direction of the holding portion 212 is positioned below the upper end in the axial direction of the circuit board 27 in the axial direction. Thereby, the motor 1 can be reduced in thickness.

  The protruding portion 213 protrudes from the outer side in the radial direction of the lid portion 211 toward the lower side in the axial direction. The protrusion 213 is substantially annular. Moreover, the protrusion part 213 is substantially cylindrical shape. The inner peripheral surface of the protrusion 213 is in contact with the upper outer peripheral surface of the stator core 23. Thereby, the coaxial precision of center axis J1 and upper bearing 281 can be improved. Further, the rigidity of the upper bracket 21 can be improved. Further, the inner peripheral surface of the protruding portion 213 may contact the outer peripheral surface of the circuit board 27 or the outer peripheral surface of the upper insulator 25. When the inner peripheral surface of the protruding portion 213 is in contact with the circuit board 27 and the upper insulator 25, the rigidity of the upper bracket 21 can be further improved.

  A plurality of through holes 214 are arranged in the circumferential direction on the radially outer portion on the lid portion 211. In the present embodiment, the number of through holes 214 is three. The fixing member 61 is inserted into each through hole 214. In the present embodiment, the fixing member 61 is a screw (hereinafter, referred to as a screw 61 if necessary). A seat surface 2141 is disposed around the through hole 214. The seat surface 2141 is located on the lower side in the axial direction than the lid portion 211. The head of the screw 61 is in contact with the seating surface 2141. In other words, the fixing member 61 has a lower surface that contacts the upper surface of the upper bracket 25. Thereby, even when the screw 61 is inserted, the screw 61 can be prevented from protruding upward in the axial direction from the lid portion 211. Thereby, the motor 1 can be reduced in thickness. The diameter of the screw portion of the screw 61 is the same as or slightly smaller than the diameter of the through hole 214. Thereby, after the screw 61 is inserted, the upper bracket 21 is restrained from moving in the circumferential direction with respect to the armature 29. Therefore, the upper bracket 21 and the armature 29 can be firmly fixed. The fixing member 61 may be a rivet. Further, a ground pattern may be formed on the edge of the fixed portion insertion portion 275 of the circuit board 27. Thereby, the ground can be taken between the ground pattern of the circuit board 27 and the upper bracket 21 by the screw 61.

  Further, when an electronic component having a large calorific value is mounted on the circuit board 27, the electronic component is preferably disposed so as to face the electronic component. Thereby, the distance of an electronic component and the upper bracket 21 can be made close. As a result, heat generated from the electronic component can be radiated from the upper bracket 21. Further, a heat conducting material such as silicon may be interposed between the electronic component and the rib 215. This further promotes heat dissipation from the electronic component. An example of an electronic component that generates a large amount of heat is a field effect transistor (FET).

  The opening 215 is a through hole arranged in the lid portion 211. The connector 273 mounted on the circuit board 27 is exposed from the opening 215. Electric power is supplied to the motor 1 by being connected to the connector 273 through the opening 215.

  The shape of the upper insulator 25 will be described in detail with reference to FIG. The upper insulator 25 has a magnetic pole tooth insulating part 251 and a core back insulating part 252. The magnetic pole tooth insulating portion 251 covers the upper surface and the side surface of each magnetic pole tooth 232. The core back insulating part 252 is annular and connects the magnetic pole tooth insulating parts 251. A plate portion 2511 that protrudes upward in the axial direction is provided at the radially inner end of each magnetic pole tooth insulating portion 251. The core back insulating portion 252 extends axially upward on the radially outer side of the coil 24. The upper end surface of the core back insulating portion 252 is positioned on the upper side in the axial direction than the coil 24. Thereby, interference with the coil 24 and other members, such as the circuit board 27 and the upper bracket 21, can be prevented.

  The core back insulating part 252 includes an annular wall part 253, a positioning convex part 254, a flange part 255, and a fixing member insertion concave part 256. The annular wall portion 253 is a substantially annular wall that protrudes in the axial direction from the radially outer end of the core back insulating portion 252. The upper surface of the annular wall portion 253 is a seat surface 2531, which is a plane substantially perpendicular to the central axis. The seating surface 2531 is in contact with the lower surface of the circuit board 27. More specifically, the seating surface 2531 is in contact with the lower surface near the outer edge of the circuit board 27. The outer end of the annular wall portion 253 is located radially inward from the outer end of the stator core 23. Therefore, the portion of the stator core 23 located on the radially outer side of the annular wall portion 253 is the upper core back exposed portion 41 exposed toward the upper side in the axial direction.

  The positioning convex portion 254 is located at substantially the same position in the radial direction as the annular wall portion 253, and protrudes toward the upper side in the axial direction from the seat surface 2531. Further, the positioning convex portion 254 is positioned on the lower side in the axial direction than the upper surface of the circuit board 27. Therefore, the positioning convex part 254 is accommodated in the positioning part 272 of the circuit board 27. As a result, the positioning convex portion 254 does not contact the upper bracket 21 even when the lower surface of the protruding portion 213 of the upper bracket 21 contacts the upper surface of the circuit board 27 as will be described later. Therefore, the circuit board 27 is firmly fixed.

  Moreover, in this embodiment, the positioning convex part 254 is provided in three places at intervals in the circumferential direction. In this embodiment, the positioning protrusions 254 are provided at three places, but the present invention is not limited to this, and may be provided at one place, two places, four places or more.

  The shape of the positioning convex portion 254 in plan view is substantially the same as the positioning width narrow portion 2721 of the positioning portion 272, that is, the positioning convex portion 254 has a shape along the contour of the positioning portion 272. Thereby, the circuit board 27 can be accurately positioned with respect to the upper insulator 25.

  More preferably, the circumferential end surfaces of the positioning convex portion 254 are in contact with the circumferential end surface of the positioning portion 272. Further, the radial end surface of the positioning convex portion 254 is in contact with the radial end surface of the positioning portion 272. Thereby, the circuit board 27 can be accurately positioned with respect to the upper insulator 25. However, if a part of the end surface of the positioning convex portion 254 is in contact with the end surface of the positioning portion 272, the positioning can be accurately performed. If the circuit board 27 can be accurately positioned with respect to the upper insulator 25, the conductor can be soldered without being sandwiched between the upper insulator 25 and the circuit board 27 in the step of soldering the conductor to be described later. it can.

  A first window portion 2541 that is notched toward the lower side in the axial direction is located at the center in the circumferential direction of the positioning convex portion 254. The axial position of the lower end of the first window portion 2541 is positioned below the upper end of the plate portion 2511 of the magnetic pole tooth insulating portion 251.

  The flange portion 255 is a portion that is located at a position overlapping the annular wall portion 253 in the radial direction and protrudes from the core back insulating portion 252 in the axial direction. The flange portion 255 is located at a position different from the magnetic pole tooth insulating portion 251 in the circumferential direction. The upper end in the axial direction of the flange portion 255 is located above the upper surface of the circuit board 27 and protrudes above the seating surface 2531 and the positioning convex portion 254 in the axial direction. The collar portion 255 has a collar-shaped portion 2551 on the upper side. The bowl-shaped part 2551 protrudes inward in the radial direction. The lower surface of the bowl-shaped portion 2551 is in contact with the upper surface of the circuit board 27 or opposed via a gap.

  A second window portion 2552 in which the flange portion 255 and the annular wall portion 253 are cut downward in the axial direction is located at a position adjacent to the flange portion 255 in the circumferential direction. The axial position of the lower end of the second window portion 2552 is located below the upper end of the plate portion 2511 of the magnetic pole tooth insulating portion 251.

  In addition, the positioning convex part 254 and the collar part 255 are convex parts.

  In the present embodiment, the window portions 2541 and 2552 are arranged at a total of five places: four places every 60 degrees and three places every 120 degrees (two of which overlap with those arranged every 60 degrees). ing. Thereby, it is possible to draw out the conductive wire in either case of connecting by star connection or connecting by delta connection. Therefore, even when the connection method is changed, the common upper insulator 25 can be used. However, if only the star connection is used, the windows 2541 and 2552 may be arranged at four locations in the circumferential direction.

  The fixing member insertion recess 256 is a recess that is recessed radially inward from the outer edge of the core back insulating portion 252. A screw 61 is inserted into the fixing member insertion recess 256. The fixing member insertion recess 256 may be a hole that opens to the upper side in the axial direction, instead of a recess that is recessed radially inward.

<4. Lower bracket and lower insulator>
First, the lower bracket 22 will be described in detail. FIG. 6 is a perspective view of the lower bracket 22. Referring to FIG. 6, the lower bracket 22 includes a lower lid portion 221, a lower holding portion 222, a lower protruding portion 223, a lower fixing member accommodating portion 224, a lower horizontal rib 225, a lower vertical rib 226, A lower depression 227. The lower bracket 22 has a covered cylindrical shape. The lower lid portion 221 has a substantially annular flat plate shape. The lower holding part 222 is a recessed part that is located on the inner side in the radial direction of the lower cover part 221 and opens toward the upper side in the axial direction. The lower holding part 222 has a cylindrical inner peripheral surface 2221 and an annular top surface 2222. The inner peripheral surface 2221 is in contact with the outer peripheral surface of the outer ring of the lower bearing 282. The top surface 2222 contacts the lower end surface of the outer ring of the lower bearing 281 via a spring. As a result, the lower holding portion 222 holds the lower bearing 282.

  The lower protruding portion 223 protrudes from the radially outer side of the lower lid portion 221 toward the upper side in the axial direction. The lower protrusion 223 is substantially annular. Moreover, the lower protrusion part 223 is substantially cylindrical shape. The upper end of the lower protrusion 223 is in contact with the outer peripheral surface of the stator core 23. Thereby, the coaxial precision of the central axis J1 and the lower bearing 282 can be improved. Further, the lower bracket 22 and the stator core 23 can be firmly fixed. Further, the upper surface of the lower protrusion 223 is in direct contact with the core back 231 of the stator core 23. The lower insulator 26 does not cover the radially outer region of the core back 231. The outer end of the lower core back insulating part 262 is located radially inward from the outer end of the stator core 23. That is, the core back 231 has the core back exposed portion 42 on the radially outer side of the lower insulator 26. In the core back exposed portion 42, the upper surface of the lower protruding portion 223 and the core back 231 are in direct contact. Thereby, a reduction in accuracy due to the axial positioning of the lower bracket 22 with respect to the stator core 23 is suppressed.

  A plurality of lower fixing member accommodating portions 224 are arranged in the circumferential direction on the radially outer portion on the lower lid portion 221. In the present embodiment, the number of lower fixing member accommodating portions 224 is three. The arrangement of the lower fixing member accommodating portion 224 coincides with the circumferential position of the through hole 214 of the upper bracket. A fixing member 61 is inserted into each lower fixing member accommodating portion 224. In the present embodiment, the lower fixing member accommodating portion 224 is a bag-like hole and does not penetrate, but may be a through-hole.

  The lower horizontal rib 225 is provided on the upper surface of the lower lid portion 221. In the present embodiment, the number of the lower horizontal ribs 225 is six. The lower horizontal ribs 225 extend radially and are arranged at positions that overlap the lower fixing member housing portion 224 in plan view. Thereby, even if the lower fixing member accommodating part 224 is arrange | positioned, it can prevent that the rigidity of the lower bracket 22 falls. Further, the radially extending portions of the lower lateral rib 225 are connected in a ring shape at the center of the lower bracket 22. A ring-shaped portion of the lower horizontal rib 225 is connected to the lower holding portion 222. Thereby, the rigidity of the lower bracket 22 can be increased. Further, the lower lateral rib 225 is arranged at a position overlapping a plurality of holes for fixing with a driving device provided on the lower surface of the lower lid portion 221 in plan view (not shown). Thereby, even if a hole is arrange | positioned, it can prevent that the rigidity of the lower bracket 22 falls.

  Further, the lower vertical rib 226 is provided on the inner surface of the lower protrusion 223 and is provided to extend in the axial direction. The lower vertical rib 226 is formed continuously with the lower horizontal rib 225. Thereby, the rigidity of the lower bracket 22 can be increased. In the present embodiment, the number of lower vertical ribs 226 is six, which is the same as the number of lower horizontal ribs 225. Between the circumferential directions of the lower vertical rib 226, a lower recess 227 that is recessed outward in the radial direction is provided. Below the lower depression 227, a lower vertical rib 226 is connected in a ring shape in the circumferential direction. A ring-shaped portion of the lower vertical rib 226 is connected to the lower lid portion 221.

  FIG. 7 is a plan view of the lower insulator 26 and the stator core 23. FIG. 8 is an external perspective view of the motor 1 with the lower bracket 22 removed. The shape of the lower insulator 26 will be described in detail with reference to FIGS. 7 and 8. The lower insulator 26 includes a lower magnetic pole tooth insulating part 261 and a lower core back insulating part 262. The lower magnetic pole tooth insulating portion 261 covers the lower surface and the side surface of each magnetic pole tooth 232. The lower core back insulating part 262 is annular and connects the lower magnetic pole tooth insulating parts 261. The outer peripheral surface of the lower core back insulating portion 262 substantially coincides with the outer peripheral surface of the lower small diameter portion 43 of the core back 231 in the radial direction. That is, the lower surface of the large diameter portion of the core back 231 is not covered with the lower core back insulating portion 262 and is exposed. The lower surface of the large-diameter portion of the core back 231 is the core back exposed portion 42 described above. The lower core back insulating portion 262 protrudes in a direction away from the surface covering the core back 231 in the axial direction, and the core back insulating protrusion has a radially inner surface located radially inward from the radially inner end of the fixing member arranging portion 44. Part 2621. The lower core back insulating protrusion 2621 is provided to be a wall in the circumferential direction.

  The lower core back insulating protrusion 2621 includes a notch 2622, a coil guide wall 2623, a crossover guide wall 2624, a continuous wall 2625, and a crossover holder 2626. The notch 2622 indicates a portion where the lower core back insulating protrusion 2621 is notched partially in the circumferential direction and becomes a wall. Specifically, the notch 2622 is provided in a portion of the lower core back insulating protrusion 2621 that faces the lower magnetic pole tooth insulating portion in the radial direction. The fixing member placement portion 44 and the fixing member 61 of the stator core 23 are located outward of the notch portion 2622 in the radial direction. That is, the notch 2622 faces the fixing member 61 in the radial direction. In other words, a portion of the lower core back insulating protrusion 2621 that faces the fixing member 61 in the radial direction has a notch 2622 that is notched. Coil guide walls 2623 are disposed at both ends in the circumferential direction of the notch 2622. The circumferential width of the notch 2622 is narrower than the circumferential width of the magnetic pole teeth 232 around which the conducting wire is wound. In other words, the lower core back insulating protrusion 2621 is continuously formed at a place excluding the notch 2622. Thereby, the rigidity of the lower insulator 26 can be improved.

  The coil guide wall 2623 is located on the radially outer side of the magnetic pole tooth insulating portion 261. The radially inner surface of the coil guide wall 2623 is in contact with the radially outer side of the coil 24 configured by winding a conductive wire around the magnetic pole teeth 232. The coil 24 has multiple conductors wound around the magnetic pole teeth 232. That is, it is necessary to prevent the winding from being collapsed by an insulator or other member so that the multiple conducting wires are not collapsed. In particular, in the present embodiment, the fixing member arranging portion 44 and the fixing member 61 are located on the radially outer side of the coil 24. In the unlikely event that the coil 24 is collapsed, when the motor is assembled, the fixing member arranging portion 44 and the coil may overlap in a plan view. That is, in that case, the fixing member 61 cannot be inserted into the fixing member placement portion 44. In addition, after the fixing member 61 is inserted into the fixing member arrangement portion 44, when the coil 24 is collapsed due to a fixing change, there is a possibility that the fixing member 61 comes into contact with the fixing member 61. In the case where the fixing member 61 is made of a conductor, the dielectric strength cannot be maintained. By providing the coil guide wall 2623, the coil 24 is prevented from collapsing radially outward. The crossover guide wall 2624 is connected to the coil guide wall 2623 and provided integrally therewith. The coil guide wall 2623 and the crossover guide wall 2624 are provided via a continuous wall 2625. The continuous wall 2625 connects the coil guide wall 2623 and the crossover guide wall 2624 to prevent the core back insulating protrusion 2621 from falling even if the conductor is wound and the core back insulating protrusion 2621 is tensioned. it can. The coil guide wall 2623 is located radially inward from the crossover guide wall 2624. The radial thickness of the crossover guide wall 2624 is thinner than the radial thickness of the coil guide wall 2623.

  The connecting wire guide wall 2624 guides a connecting wire (not shown) derived from the coil 2623. A crossover holding portion 2626 is provided inward in the radial direction of the crossover guide wall 2624. The inner wall of the crossover guide wall 2624 and the crossover holding part 2626 are opposed to each other in the radial direction. A conducting wire that is a connecting wire is arranged between the connecting wire guide wall 2624 and the connecting wire holding portion 2626 and guided. In the crossover holding part 2626, a slope is provided on the outer surface at the upper end in the axial direction. This is because when the conducting wire, which is a connecting wire, is inserted between the connecting wire guide wall 2624 and the connecting wire holding portion 2626, the conducting wire is guided by the inclined surface, and workability can be improved. In the present embodiment, the crossover lines are concentrated on the lower bracket 22 side. Therefore, no crossover is formed on the upper bracket 21 side where the circuit board 27 is disposed. As a result, there is no need to consider crossovers in the arrangement of the wiring pattern on the circuit board 27, and the degree of freedom in circuit design is improved.

  As described above, the lower bracket 22 is fixed to the stator core 23, but may be fixed to the lower insulator 26. The fixing of the lower bracket 22 and the lower insulator 26 in that case will be described. The inner surface of the lower bracket 22 and the outer surface of the core back insulating protrusion 2621 of the lower insulator 26 are fixed by contact. The radially outer surface of the coil guide wall 2623 is in contact with the inner surface of the lower vertical rib 226. The lower end surface of the crossover guide wall 2624 is in contact with the lower surface of the lower recess 227. The lower end surface of the coil guide wall 2623 is in contact with the upper surface of the lower horizontal rib 225. The lower end surface of the crossover guide wall 2624 is in contact with the upper surface of the lower recess 227. At least one of the circumferential side surfaces of the lower vertical rib 226 faces the continuous wall 2625. A lower protruding portion 223 is disposed outside the core back insulating protruding portion 2621 in the radial direction. The upper end of the lower protrusion 223 contacts the lower end of the core back 231 of the stator core 23. Thus, the lower bracket 22 and the lower insulator 26 are positioned.

<5. Lower insulator and fixing member>
In FIG. 7, the fixing member 61 is inserted into the fixing member arrangement portion 44, and the upper bracket 21, the armature 29, and the lower bracket 22 are fixed. The radially inner end of the fixing member arranging portion 44 is located radially inside the outer surface of the coil guide wall 2623. The radially inner end of the fixing member arranging portion 44 is located radially outside the inner surface of the coil guide wall 2623. The core back insulating part 262 has a recess 2627. The recess 2627 is located on the periphery of the fixing member arrangement portion 44 and is recessed radially inward. In other words, the recessed portion 2627 is recessed radially inward along the peripheral edge of the fixing member arranging portion 44. Since the lower insulator 26 and the stator core 23 are mass-produced products, they are molded in a state having a certain dimensional tolerance. Therefore, when combining both, by providing the recessed part 2627, it can prevent that the lower core back insulation part 262 and the fixing member arrangement | positioning part 44 overlap in planar view. That is, it is possible to prevent the fixing member 61 from contacting the lower insulator 26 when the fixing member 61 is inserted into the fixing member arrangement portion 44. The radially inner end of the recess 2627 is located radially outside the inner surface of the coil guide wall 2623. As a result, the coil 24 is accommodated radially inward from the inner surface of the coil guide wall 2623, so that the coil 24 and the stator core 23 can be reliably insulated.

  Here, the inner end in the radial direction of the recess 2627 is located radially inward from the outer surface of the coil guide wall 2623. For this reason, when the notch 2622 does not exist, the following problems are assumed. When the thickness in the radial direction of the coil guide portion 2623 is arranged along the recess 2627, the radial inner surface of the coil guide portion 2623 protrudes inward in the radial direction. That is, the area where the conducting wire is wound becomes narrow, and the space factor deteriorates. As a result, the motor efficiency may be reduced. Moreover, when winding a conducting wire around the magnetic pole tooth | gear 232, the danger of contacting the upper surface of the coil guide part 2623 increases, and there exists a possibility that a conducting wire may be disconnected. Next, when the radially outer surface of the coil guide portion 2623 is recessed radially inward along the recess 2627 and the radially inner surface of the coil guide portion 2623 does not protrude radially inward, the coil guide portion In the region overlapping with the concave portion 2627 of 2623 in the radial direction, the radial thickness is reduced. When the coil 24 and the radially inner surface of the coil guide portion 2623 are in contact with each other, the force that pushes the coil guide portion 2623 with the coil guide portion 2623 facing outward in the radial direction at the center in the circumferential direction of the coil is strong. That is, the coil guide portion 2623 and the concave portion 2623 are easily bent radially inward at a portion where the coil guide portion 2623 and the concave portion 2623 overlap in the radial direction. Therefore, there is a possibility that the coil guide portion 2623 overlaps with the fixing member arranging portion 44 in a plan view and the fixing member 61 cannot be inserted. In the case where the lower insulator 26 is formed by injection molding, there is a possibility that the resin is not able to rotate around the cavity of the mold and the molding accuracy may not be stable at a portion where the coil guide portion 2623 is thin in the radial direction. is there.

  Further, the edge of the recess 2627 and the inner end edge of the core back insulating protrusion 2621 may coincide with each other in plan view. The circumferential side surface of the core back insulating protrusion 2621 constituting the notch 2622 may coincide with a part of the recess 2627 in plan view. With such a configuration, the coil 24 can be further prevented from falling.

<6. Assembly of armature, circuit board and bracket>
Next, an assembly process of the armature 29, the circuit board 27, the upper bracket 21, and the lower bracket 22 will be described. The assembly of the stator core 23, the coil 24, the upper insulator 25, and the lower insulator 26 is defined as an armature 29.
First, the ends of U, V, W, and common of the coil 24 are pulled out radially outward from the windows 2541 and 2552 of the upper insulator 25. Thereby, even if the circuit board 27 is placed on the armature 29, the conductive wire is not sandwiched between the upper insulator 25 and the circuit board 27.

  Next, the circuit board 27 is placed on the seat surface 2531 of the upper insulator 25 of the armature 29. At this time, the positioning convex portion 254 is inserted into the positioning portion 272 of the circuit board 27. Thereby, the circuit board 27 can be accurately positioned with respect to the armature 29. Thereby, the magnetic sensor 271 mounted on the circuit board 27 can be accurately arranged. Further, the flange portion 255 is inserted into the flange portion insertion portion 274 of the circuit board 27. The flange portion 255 is elastically deformed, and the portion 2551 comes into contact with the upper surface of the circuit board 27 or faces in the axial direction through a gap. Thereby, the movement of the circuit board 27 in the axial direction with respect to the armature 29 can be restricted, and the circuit board 27 can be temporarily fixed.

  At this time, the circumferential positions of the window portions 2541 and 2552, and the flange insertion portion 274 and the fixing member insertion portion 275 coincide with each other. Preferably, the circumferential positions of the windows 2451 and 2552, the flange insertion wide portion 2742, and the fixing member insertion wide portion 2752 coincide with each other. Thereby, the workability | operativity of the soldering described below improves.

  Next, each drawn end is soldered to a land located on the upper surface of the circuit board 27. At this time, each land is disposed adjacent to the flange insertion portion 274 and the fixing member insertion portion 275. Therefore, it can be easily soldered.

Next, the upper bracket 21 is placed on the circuit board 27. Further, the inner peripheral surface of the protruding portion 213 of the upper bracket 21 is placed so as to contact the upper small diameter portion 43 of the stator core 23. Thereby, the positioning of the upper bracket 21 and the armature 29 in the circumferential direction and the radial direction can be accurately performed. As a result, the coaxiality between the upper bearing 281 supported by the upper bracket 21 and the armature 29 can be accurately arranged. At this time, the positions of the through hole 214, the fixing member insertion portion 275, and the fixing member insertion recess 256 in a plan view are the same. Thereby, the screw 61 can be easily inserted.
Further, the lower bracket 22 is placed on the lower side of the armature 29. At this time, the coil guide wall 2623 is disposed so that the outer surface thereof is in contact with the inner surface of the lower vertical rib 226. In addition, the lower end surface of the crossover guide wall 2624 is disposed so as to contact the lower surface of the lower recess 227. By arranging in this way, it is possible to easily position the lower bracket 22 in the circumferential direction.

Finally, the upper bracket 25, the circuit board 27, the armature 29, and the lower bracket 26 are fixed with the screws 61. Specifically, the screw 61 passes through the through hole 214 of the upper bracket 21, the fixing member insertion recess 256 of the upper insulator 25, the through hole 233 of the stator core 23, and the recess 2627 of the lower insulator 26, and is fixed to the lower bracket 22. It is fixed to the member accommodating part 224.
As a result, the upper end surface of the stator core 23 comes into contact with the lower end surface of the protruding portion 213 of the upper bracket 21. Further, the lower end surface of the stator core 23 is in contact with the upper end surface of the lower bracket 22. Further, the circuit board 27 is sandwiched between the upper bracket 21 and the core back insulating part 252. As a result, the circuit board 27 and the upper bracket 21 can be firmly fixed to the armature 29.

  Further, the upper bearing 281 is positioned on the upper side in the axial direction from the lower end of the screw 61. Thereby, the distance of the upper bearing 281 and the lower bearing 282 can be lengthened, and the shaft 31 can be supported stably.

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

  In this embodiment, the three-phase brushless motor is used, but the present invention is not limited to this. A single-phase or two-phase brushless motor may be used. Moreover, the motor with a brush which has a brush and a commutator may be sufficient. Moreover, you may use for other types of motors, such as a stepping motor.

  In the present embodiment, the protruding portion is annular, but is not limited thereto. Other shapes such as a flat plate shape may be used. The screw insertion direction may be reversed.

  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 an inner rotor type motor.

DESCRIPTION OF SYMBOLS 1 Motor 2 Stationary part 21 Upper bracket 211 Cover part 212 Holding part 2121 Inner peripheral surface 2122 Top surface 213 Protrusion part 214 Through-hole 2141 Seat surface 215 Rib 216 Recessed part 217 Opening 22 Lower bracket 221 Bottom part 222 Large diameter cylindrical part 223 Small diameter cylinder Part 23 stator core 231 core back 232 magnetic pole tooth 24 coil 25 upper insulator 251 magnetic pole tooth insulation part 252 core back insulation part 26 lower insulator 261 lower magnetic pole tooth insulation part 262 lower core back insulation part 27 circuit board 28 bearing part 281 upper bearing 282 lower Bearing 29 Armature 31 Shaft 32 Rotor holder 321 Central portion 322 Tubular portion 33 Rotor magnet 44 Fixed member disposition portion 51 Groove portion 52 Inner end surface 61 Fixed member (screw)

Claims (15)

The motor has a shaft that is rotatably supported by a bearing member around a central axis extending vertically.

A rotor magnet that rotates with the shaft;

An armature located radially outside the rotor magnet;

An upper bracket that is disposed on the upper side in the axial direction of the armature and holds an upper bearing that rotatably supports the shaft in the radial center;

A lower bracket that is disposed on the lower side in the axial direction of the armature and holds a lower bearing that rotatably supports the shaft in the radial center;

A fixing member extending vertically and fixing the armature to the upper bracket and the lower bracket;

And the armature is

A stator core including an annular core back and a plurality of magnetic pole teeth projecting radially inward from the core back;

An insulator covering at least an upper surface and a lower surface of the magnetic pole teeth of the stator core;

A coil configured by winding a conductive wire around the magnetic pole teeth via the insulator;

Have

The insulator is

A magnetic pole tooth insulation covering the magnetic pole teeth;

A core back insulating portion connected to the magnetic pole tooth insulating portion and covering at least a part of the upper and lower end surfaces of the core back;

Have

The stator core includes a fixing member disposition portion that is a through hole through which the fixing member penetrates in the axial direction or a notch that is recessed from the outside in the radial direction toward the inside in the radial direction outward of the magnetic pole teeth, The insulating portion further includes a core back insulating protruding portion that protrudes in a direction away from the surface covering the core back in the axial direction, and has a radially inner surface positioned radially inward from a radially inner end of the fixing member arranging portion. ,

Wherein among the core-back insulating protrusion portion facing the fixing member and the radial direction Ri notch there was notched,

The core back insulating protrusion has a coil guide wall located on the outer side in the radial direction of the magnetic pole tooth insulating part and disposed at both circumferential ends of the notch,

A motor in which a radially inner surface of the coil guide wall and the coil are in contact with each other . The lower bracket is a covered cylindrical shape,

The core-back insulating protrusions connect with pre Symbol coil guide wall has a connecting wire guide wall for guiding the connecting wire,

The motor according to claim 1, wherein an outer surface of the coil guide wall and an outer surface of the crossover guide wall are opposed to an inner surface of the lower bracket. The coil guide wall and the crossover guide wall are connected via a continuous wall,

The motor according to claim 2, wherein the coil guide wall is located radially inward from the crossover guide wall. The core back insulating protrusion is

Furthermore, it has a crossover holding part,

The inner wall of the connecting wire guide wall and the connecting wire holding part are opposed to each other in the radial direction,

The motor according to claim 2 or 3, wherein the conducting wire is disposed between the connecting wire guide wall and the connecting wire holding part. The lower bracket has a rib extending in the axial direction on the inner surface,

5. The motor according to claim 2, wherein an inner surface of the rib is radially opposed to an outer surface of the coil guide wall. The lower bracket has a rib extending in the axial direction on the inner surface,

  The motor according to claim 2, wherein at least one of the circumferential side surfaces of the rib is opposed to the continuous wall. The motor according to claim 2, wherein a radial thickness of the crossover guide wall is thinner than a radial thickness of the coil guide wall. The motor according to any one of claims 1 to 7, wherein a circumferential width of the notch is narrower than a circumferential width of the magnetic pole teeth around which the conducting wire is wound. 9. The motor according to claim 2, wherein an inner end in the radial direction of the fixing member arranging portion is located radially inward from an outer surface of the coil guide wall. The motor according to any one of claims 1 to 9, wherein the core back insulating portion includes a concave portion that is recessed radially inward along a peripheral edge of the fixing member arrangement portion. The motor according to claim 10, wherein an inner end in the radial direction of the concave portion is located on an outer side in the radial direction with respect to an inner surface of the coil guide wall. The motor according to claim 11, wherein an edge of the concave portion and an inner end edge of the core back insulating protruding portion coincide with each other in plan view. The motor according to any one of claims 10 to 12, wherein a circumferential side surface of the core back insulating projecting portion constituting the cutout portion coincides with a part of the concave portion in plan view. The motor according to any one of claims 1 to 13, wherein the notch is notched to the base of the core back insulating protrusion. The lower bracket has an annular lower protrusion,

  The motor according to any one of claims 1 to 14, further comprising a core back exposed portion in which a top surface of the lower protruding portion and the core back are in direct contact with each other on a radially outer side of the core back insulating portion. .

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