Stator and motor

Abstract

To accurately position an insulator, thereby increasing a winding space of a conductor wire to be wound around via the insulator.SOLUTION: A stator comprises a magnetic material 210, an insulator 300, and a coil 400. The magnetic material has a magnetic pole part 230, a ring 220, and a spoke 250. The spoke has a first end part 251, a second end part 252, and a lateral part 253. The insulator has: a first plate 310 covering the first end part; and a second plate 360 covering the second end part. In a circumferential direction, a width w1 of the first plate and the second plate is larger than a width w2 of the spoke. A conductor wire 401 of the coil 400 is wound around the spoke. The lateral part of the spoke faces the conductor wire. In a radial direction, an end surface 230i of the magnetic pole part has an engaging part 236. In the radial direction, the first plate has an engaged part 336 which is to be engaged with the engaging part 236.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a stator and a motor. [Background technology]

[0002] Conventionally, in a stator that constitutes a motor, a coil is wound around teeth that are arranged intermittently at a predetermined pitch via an insulator, but it is required that the insulator be securely fixed to each tooth.

[0003] To address this issue, an electric motor has been proposed in which approximately triangular ridges are provided on the inner peripheral edge of the side wall of the insulator and engagement grooves are provided on the side surfaces of the teeth near their tips. In this electric motor, when the insulator is fitted to the teeth, the elastic deformation of the ridges on the insulator engages with the engagement grooves on the teeth, preventing the insulator from coming off the teeth (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-141444 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the stator of the electric motor of Patent Document 1, the insulators surrounding the teeth may reduce the space available for winding the conductor around the teeth.

[0006] Therefore, an example of an object of the present invention is to provide a stator that can expand the space for winding a conductor around an insulator, and a motor using the stator. [Means for solving the problem]

[0007] The stator of the present invention comprises a magnetic body, an insulator covering the magnetic body, and a coil, wherein the magnetic body comprises a magnetic pole portion, a ring, and spokes connecting the magnetic pole portion and the ring, wherein the spokes have, in the direction of the rotation axis, a first end, a second end, and a side portion between the first end and the second end, wherein the insulator comprises a first plate covering the first ends of the spokes and a second plate covering the second ends of the spokes, wherein the widths of the first plate and the second plate are greater than the width of the spokes in the circumferential direction, a conductive wire forming the coil is wound around the spokes, the side portions of the spokes face the conductive wire, the end faces of the magnetic pole portion have an engaging portion in the radial direction, and the first plate has an engaged portion in the radial direction that engages with the engaging portion. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a longitudinal sectional view showing the overall configuration of a motor including a stator according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view showing a state in which an insulator is attached to a stator core (without coil wires wound thereon) according to a first embodiment that is one example of the present invention; [Figure 3] 1 is an exploded perspective view showing a configuration of a stator core and an insulator (without a coil wound thereon) according to a first embodiment that is one example of the present invention. [Figure 4] 1 is a perspective view showing the overall configuration of a stator core according to a first embodiment of the present invention; [Figure 5A] 1 is a partially enlarged perspective view showing the configuration of a stator core according to a first embodiment of the present invention, which is an example of the present invention. [Figure 5B] 1 is a partially enlarged plan view showing the configuration of a magnetic pole portion of a stator core according to a first embodiment of the present invention; [Figure 6]1 is a perspective view showing a configuration in which an upper plate of an insulator according to a first embodiment of the present invention is turned upside down; [Figure 7] 1 is a partially enlarged perspective view showing the configuration of an upper rectangular plate of an insulator according to a first embodiment of the present invention, which is an example of the present invention. [Figure 8A] 1 is a partially enlarged perspective view showing the configuration of a magnetic pole portion of an insulator according to a first embodiment of the present invention. [Figure 8B] 1 is a partially enlarged plan view showing the configuration of a magnetic pole portion of an insulator according to a first embodiment of the present invention; [Figure 9] 1 is a partially enlarged perspective view showing an insulator according to a first embodiment of the present invention, in which an upper plate is attached to a stator, in a state in which the insulator is turned upside down. [Figure 10] FIG. 10 is a partially enlarged perspective view showing a state in which a gap is formed between a spoke and a conductor when the coil conductor is wound around the spoke of a stator core via an upper plate and a lower plate of an insulator according to a first embodiment of the present invention. [Figure 11] 10 is a perspective view showing a state in which an insulator is attached to a stator core (without coil wires wound thereon) according to a second embodiment which is one example of the present invention. FIG. [Figure 12] FIG. 10 is an exploded perspective view showing the configuration of a stator core and an insulator (without coils wound) according to a second embodiment of the present invention, which is one example of the present invention. [Figure 13A] FIG. 4 is a partially enlarged perspective view showing the configuration of a stator core according to a second embodiment of the present invention. [Figure 13B] 10 is a partially enlarged plan view showing the configuration of a magnetic pole portion of a stator core according to a second embodiment of the present invention. FIG. [Figure 14] FIG. 10 is a perspective view showing a configuration in which an upper plate of an insulator according to a second embodiment of the present invention is turned upside down. [Figure 15A]FIG. 4 is a partially enlarged perspective view showing the configuration of a magnetic pole portion of an insulator according to a second embodiment of the present invention. [Figure 15B] 10 is a partially enlarged plan view showing the configuration of a magnetic pole portion of an insulator according to a second embodiment of the present invention. FIG. [Figure 16] FIG. 10 is a partially enlarged perspective view showing a state in which an insulator according to a second embodiment, which is an example of the present invention, is attached to a stator. [Figure 17A] 3 is a plan view illustrating magnetic saturation caused by an engaging portion of a magnetic pole portion in the first embodiment that is an example of the present invention. FIG. [Figure 17B] 10 is a plan view illustrating magnetic saturation caused by an engaging portion of a magnetic pole portion in a second embodiment that is an example of the present invention. FIG. [Figure 18] FIG. 10 is a partially enlarged perspective view showing the configuration of an insulator according to a third embodiment, which is an example of the present invention. [Figure 19] FIG. 10 is a partially enlarged perspective view showing the shape of an insulator according to a third embodiment of the present invention and a state in which a conductor wire of a coil is wound around it. [Figure 20] FIG. 10 is a partially enlarged perspective view showing the shape of an insulator according to a fourth embodiment of the present invention. [Figure 21] FIG. 10 is a partially enlarged cross-sectional view showing the shape of an insulator according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] <Embodiment> Hereinafter, first to fourth embodiments, which are examples of the present invention, will be described in order with reference to the drawings.

[0010] Fig. 1 is a vertical cross-sectional view showing the overall configuration of a motor 100 including a stator 200 according to a first embodiment, which is an example of the present invention. Fig. 2 is a perspective view showing a state in which an insulator 300 is attached to a stator core 210 according to the first embodiment, which is an example of the present invention (the conducting wire 401 of the coil 400 is not wound).

[0011] Fig. 3 is an exploded perspective view showing the configuration of a stator core 210 and an insulator 300 (without a coil 400 wound thereon) according to a first embodiment which is an example of the present invention. Fig. 4 is a perspective view showing the overall configuration of a stator core 210 according to the first embodiment which is an example of the present invention.

[0012] Fig. 5A is a partially enlarged perspective view showing the configuration of stator core 210 according to the first embodiment, which is an example of the present invention. Fig. 5B is a partially enlarged plan view showing the configuration of magnetic pole portion 230 of stator core 210 according to the first embodiment, which is an example of the present invention. Fig. 6 is a perspective view showing the configuration when the upper plate of insulator 300 according to the first embodiment, which is an example of the present invention, is turned upside down.

[0013] Fig. 7 is a partially enlarged perspective view showing the configuration of upper rectangular plate 350 of insulator 300 according to a first embodiment, which is an example of the present invention. Fig. 8A is a partially enlarged perspective view showing the configuration of magnetic pole portion 330 of insulator 300 according to the first embodiment, which is an example of the present invention. Fig. 8B is a partially enlarged plan view showing the configuration of magnetic pole portion 330 of insulator 300 according to the first embodiment, which is an example of the present invention.

[0014] Fig. 9 is a partially enlarged perspective view, upside down, showing a state in which upper plate 310 of insulator 300 according to a first embodiment, which is an example of the present invention, is attached to stator 200. Fig. 10 is a partially enlarged perspective view showing a state in which gaps S are formed between spokes 250 and conductive wires 401 when conductive wires 401 of coils 400 are wound around spokes 250 of stator core 210 via upper plate 310 and lower plate 360 ​​of insulator 300 according to the first embodiment, which is an example of the present invention.

[0015] In the description of the first to fourth embodiments of the present invention, for convenience of explanation, the direction of arrow a along the rotation axis X will be referred to as the upper side or one side. The direction of arrow b along the rotation axis X will be referred to as the lower side or the other side. Here, the direction of arrow ab will be referred to as the up-down direction or the direction of the rotation axis X. However, the upper side and the lower side do not necessarily coincide with the upper side and the lower side in the vertical direction. Furthermore, the direction of arrow cd will be referred to as the radial direction, the direction of arrow c away from the rotation axis X will be referred to as the outer circumferential side or one radial side, and the direction of arrow d approaching the rotation axis X will be referred to as the inner circumferential side or the other radial side. Furthermore, the direction of rotation around the rotation axis X will be referred to as the circumferential direction.

[0016] First Embodiment 1, motor 100 according to the first embodiment of the present invention is an outer rotor type three-phase brushless DC motor having an overall cylindrical shape. However, motor 100 is not limited to a three-phase brushless DC motor and may be, for example, a three-phase brushless DC motor or other motors.

[0017] The motor 100 includes a base 110 , a shaft 130 , a bearing device 150 , a rotor 170 , and a stator 200 .

[0018] <Bass> The base 110 of the motor 100 comprises a substantially disk-shaped plate 111, a cylindrical outer peripheral portion (hereinafter referred to as the outer peripheral wall) 112 extending a predetermined length upward (in the direction of arrow a) from the radially outer end (in the direction of arrow c) of the plate 111, and a cylindrical inner peripheral portion (hereinafter referred to as the inner peripheral wall) 113 protruding a predetermined length upward (in the direction of arrow a) from the radially inner end (in the direction of arrow d) on the other radial side of the plate 111.

[0019] Plate 111 is disposed radially between inner circumferential wall 113 and outer circumferential wall 112 of base 110, and in the axial direction, an end of inner circumferential wall 113 is formed longer (higher) in the direction of rotation axis X than an end of outer circumferential wall 112. In addition, inner circumferential wall 113 has an end face (hereinafter referred to as the "upper end face") on the upper side (direction of arrow a), and an inner circumferential portion of substrate (hereinafter referred to as circuit board) 190 is fixed to the upper end face by adhesive or the like, and an intermediate portion between the inner circumferential portion and the outer circumferential portion of circuit board 190 is fixed to insulator 300.

[0020] The circuit board 190 is formed of a thin, annular member. The circuit board 190 is provided with one or more electronic components that constitute a control circuit (not shown) that drives the rotor 170 of the motor 100, and is formed with one or more wires that are electrically connected to the one or more electronic components. The one or more wires are formed on the circuit board 190 as a single layer or multiple wiring layers, and the circuit board 190 is a so-called printed wiring board.

[0021] <Shaft> Shaft 130 is rotatably supported by upper bearing 151 and lower bearing 153 of bearing device 150. The upper end (in the direction of arrow a) of shaft 130 is fixed to inner periphery 174 of magnetic body 171 of the rotor (hereinafter referred to as rotor yoke) by press-fitting, adhesive, or the like.

[0022] <Bearing device> Bearing device 150 is formed by upper bearing 151, lower bearing 153, and sleeve 155. Upper bearing 151 and lower bearing 153 are, for example, ball bearings. Bearing 151 and bearing 153 are not limited to ball bearings, and may be various other bearings such as sleeve bearings.

[0023] Incidentally, a coil spring sp is disposed between the upper end of the bearing 151 in the bearing device 150 and the disk portion 173 that is part of the rotor yoke 171 as an elastic member that applies a preload to the bearing 151.

[0024] The sleeve 155 of the bearing device 150 is made of metal and has a cylindrical shape. The sleeve 155 is fixed to the inner circumferential surface (the radially inner surface) of the inner circumferential wall 113 of the base 110 by press-fitting or adhesive. The sleeve 155 may be formed integrally with the base 110 in a state where it is inserted into the inner circumferential wall 113.

[0025] Upper bearing 151 is disposed above shaft 130 (in the direction of arrow a) and supports the upper portion of shaft 130 (in the direction of arrow a) rotatably relative to sleeve 155. Lower bearing 153 is disposed below shaft 130 (in the direction of arrow b) and supports the lower portion of shaft 130 (in the direction of arrow b) rotatably relative to sleeve 155. Thus, shaft 130 is rotatably supported relative to sleeve 155 via the two bearings 151 and 153.

[0026] <Rotor> Rotor 170 is fixed to the upper end (in the direction of arrow a) of shaft 130. Rotor 170 has rotor yoke 171 and magnet 175. Rotor yoke 171 has outer circumferential portion 172 provided on the outer circumferential side, disk portion 173 provided in the center, and inner circumferential portion 174 of rotor yoke 171 provided on the inner circumferential side.

[0027] Outer periphery 172 of rotor yoke 171 is a cylindrical portion formed of a magnetic material and arranged coaxially with shaft 130. An annular magnet 175 is fixed to the inner circumferential surface (the radially inner surface) of outer periphery 172 of rotor yoke 171, coaxially with outer periphery 172. Outer periphery 172 functions as a portion that prevents leakage of the magnetic field of magnet 175.

[0028] The disk portion 173 of the rotor yoke 171 is an approximately disk-shaped portion that extends from the upper end of the outer circumferential portion 172 radially inward (in the direction of arrow d) toward the shaft 130 and closes the upper side (in the direction of arrow a) of the outer circumferential portion 172.

[0029] Inner peripheral portion 174 of rotor yoke 171 is a cylindrical portion that extends a predetermined length from the radially inner end (direction of arrow d) of disk portion 173 toward bearing 151. In the radial direction, the dimension (inner diameter) of inner peripheral portion 174 of rotor yoke 171 is formed to be slightly smaller than the dimension (outer diameter) of shaft 130. In the direction of rotation axis X, the length of inner peripheral portion 174 of rotor yoke 171 is smaller than the length of outer peripheral portion 172 of rotor yoke 171, and is disposed on the upper end side of shaft 130 with respect to bearing 151.

[0030] The upper end (in the direction of arrow a) of shaft 130 is press-fitted into the inner peripheral surface (diametrically inner surface) of inner peripheral portion 174 of rotor yoke 171, and rotor yoke 171 and shaft 130 are fixed together.

[0031] <Stator> The stator 200 is fixed to the outer peripheral surface (radially outer surface) of the sleeve 155 of the bearing device 150. The stator 200 has a structure having, for example, 12 slots, and includes a stator core 210, an insulator 300, and a coil 400.

[0032] In stator 200, insulator 300 is attached to stator core 210, but is not attached so as to cover the entire periphery of stator core 210.

[0033] 2 and 3, in stator 200, upper plate 310 of insulator 300 is attached to the upper side of stator core 210, and lower plate 360 ​​of insulator 300 is attached to the lower side of stator core 210. Note that coil 400 is not shown in FIGS. 2 and 3 for ease of viewing.

[0034] <Stator core> 4, stator core 210 as a magnetic body is formed by a laminate of multiple electromagnetic steel sheets formed of soft magnetic material. However, stator core 210 is not limited to this, and may be formed by, for example, compression molding. Furthermore, stator core 210 as a magnetic body (multiple electromagnetic steel sheets) may be covered with an insulating coating made of resin such as varnish or an inorganic material.

[0035] Stator core 210 has ring 220, magnetic pole portions 230, and spokes 250 that extend radially from ring 220 toward the outer periphery (direction of arrow c) and connect ring 220 and magnetic pole portions 230. Spokes 250 and magnetic pole portions 230 form so-called teeth.

[0036] The ring 220, magnetic pole portion 230, and spokes 250 that make up the stator core 210 are integrally formed. However, for ease of explanation, the stator core 210 will be explained separately as the ring 220, magnetic pole portion 230, and spokes 250.

[0037] <Ring> Ring 220 of stator core 210 is provided on the inner circumferential side (arrow d direction), and has an annular upper end surface 220a on the upper side (arrow a direction) and a lower end surface 220b on the lower side (arrow b direction).

[0038] The upper end surface 220a of the ring 220 is part of the upper surface of the uppermost electromagnetic steel sheet among the multiple stacked electromagnetic steel sheets, and is a flat surface along the horizontal direction perpendicular to the direction of the rotation axis X. The lower end surface 220b of the ring 220 is part of the lower surface of the lowermost electromagnetic steel sheet among the multiple stacked electromagnetic steel sheets, and is a flat surface along the horizontal direction perpendicular to the direction of the rotation axis X. Therefore, the upper end surface 220a and the lower end surface 220b are parallel to each other.

[0039] An inner peripheral surface 220i of this ring 220 is fixed in close contact with the outer peripheral surface of the sleeve 155 (FIG. 1). A plurality of spokes 250 extend radially from an outer peripheral surface 220g of the ring 220 toward the outer periphery (in the direction of arrow c).

[0040] <Magnetic pole part> The magnetic pole portion 230 of the stator core 210 is provided radially on the outer circumferential side (direction of arrow c) which is the tip of the spoke 250, and is the portion located at the end of the outer circumferential side (direction of arrow c) opposite the ring 220 of the stator core 210.

[0041] The magnetic pole portion 230 is formed integrally with the tip of the spoke 250 and has portions that protrude clockwise and counterclockwise in the circumferential direction. In the circumferential direction, the distance between two adjacent protruding portions of the magnetic pole portion 230 is narrower than the distance between adjacent spokes 250.

[0042] The magnetic pole part 230 has an upper end face 230a on the upper side (in the direction of arrow a) of the portion protruding in the clockwise and counterclockwise directions, and a lower end face 230b on the lower side (in the direction of arrow b).

[0043] The upper end surface 230a of the magnetic pole portion 230 is part of the upper surface of the uppermost electromagnetic steel sheet among the multiple stacked electromagnetic steel sheets, and is a flat surface along the horizontal direction perpendicular to the direction of the rotation axis X. The lower end surface 230b of the magnetic pole portion 230 is part of the lower surface of the lowermost electromagnetic steel sheet among the multiple stacked electromagnetic steel sheets, and is a flat surface along the horizontal direction perpendicular to the direction of the rotation axis X. Therefore, the upper end surface 230a and the lower end surface 230b are parallel to each other.

[0044] Also, as shown in Figures 5A and 5B, the magnetic pole portion 230 has an outer peripheral surface 230g on the outermost side and two inclined inner surfaces 230i that are connected to the side surfaces 253c on both sides of the side portion 253 of the spoke 250 and face the ring 220 side.

[0045] The outer peripheral surface 230g of the magnetic pole portion 230 is a surface that curves along the inner peripheral surface of the magnet 175, and a predetermined gap (magnetic gap) is formed between the outer peripheral surface 230g and the inner peripheral surface of the magnet 175 in the radial direction.

[0046] The inner surfaces 230i of the magnetic pole portions 230 are inclined from both side ends of the outer peripheral surface 220g toward the spokes 250 and approach the outer peripheral surface 220g of the ring 220, and extend to the side surfaces 253c of the side portions 253 of the spokes 250.

[0047] An engagement portion 236 is formed on a portion (in this embodiment, the center position) of the inner surface (end surface) 230i of the magnetic pole portion 230. This engagement portion 236 protrudes radially toward the outer peripheral surface 220g of the ring 220 and extends along the direction of the rotation axis X. The outer shape of the engagement portion 236 is a polygonal prism (in this embodiment, a triangular prism). That is, the engagement portion 236 is a convex portion that extends in the direction of the rotation axis X and protrudes radially toward the ring 220.

[0048] The two engagement portions 236 formed on one magnetic pole portion 230 are provided symmetrically with respect to the spoke 250. The engagement portion 236 includes a side surface 236m extending in the radial direction, a side surface 236n extending in the circumferential direction, and an apex formed by the intersection of the side surface 236m and the side surface 236n. Specifically, the engagement portion 236 has, for example, a right-angled triangular shape in a plan view.

[0049] The engaging portion 236 has a side surface 236m corresponding to the short side (opposite side) of a right triangle and a side surface 236n corresponding to the long side (adjacent side) of the right triangle. The angle formed by the side surfaces 236m and 236n is approximately 90 degrees.

[0050] A side surface 236n of the engagement portion 236 faces the outer peripheral surface 220g of the ring 220. A side surface 236m of the engagement portion 236 is substantially perpendicular to the side surface 236n and is substantially parallel to the side surface 253c of the spoke 250, for example.

[0051] Furthermore, the magnetic pole portion 230 has two end portions 230p formed on the other magnetic pole portion 230 side relative to the engaging portion 236 in the circumferential direction. The end portions 230p have an inner surface 230pi, of the inner surface 230i, that is located on the other magnetic pole portion 230 side relative to the engaging portion 236. In other words, the inner surface 230pi of the end portions 230p is part of the inner surface 230i of the magnetic pole portion 230.

[0052] <Spokes> As shown in FIG. 4, the spokes 250 extend radially from the outer peripheral surface 220g of the ring 220 toward the magnetic pole portion 230 on the outer peripheral side (direction of arrow c), and connect the ring 220 and the magnetic pole portion 230.

[0053] The spokes 250 extend in the direction of the rotation axis X and have a rectangular parallelepiped shape in a plan view. However, this is not limited thereto, and the spokes 250 may have, for example, a tapered trapezoid shape in a plan view that gradually becomes thinner from the ring 220 toward the magnetic pole portion 230.

[0054] Each spoke 250 has a first end 251 as an end having an upper end surface 251a, a second end 252 as an end having a lower end surface 252b, and a side portion 253 having a side surface 253c between the first end 251 and the second end 252. The two side surfaces 253c of the side portion 253 of the spoke 250 face back to back.

[0055] The upper end surface 251a of the first end 251 of the spoke 250 is part of the upper surface of the electromagnetic steel plate arranged at the top of the stacked electromagnetic steel plates, and is a flat surface along a horizontal direction perpendicular to the direction of the rotation axis X.

[0056] Lower end surface 252b of second end 252 of spoke 250 is part of the lower surface of the lowest electromagnetic steel sheet among the multiple stacked electromagnetic steel sheets, and is a flat surface along the horizontal direction perpendicular to the direction of rotation axis X. Therefore, upper end surface 251a and lower end surface 252b are parallel to each other.

[0057] Upper end surfaces 251a of first ends 251 of spokes 250 are connected flush with upper end surface 220a of ring 220 and upper end surface 230a of magnetic pole portion 230. Similarly, lower end surfaces 252b of second ends 252 of spokes 250 are connected flush with lower end surface 220b of ring 220 and lower end surface 230b of magnetic pole portion 230.

[0058] The side surface 253c of the side portion 253 of the spoke 250 is an aggregate of the respective side surfaces of a plurality of stacked electromagnetic steel plates, and as a whole forms a surface extending in the direction of the rotation axis X, and the two side surfaces 253c of the side portion 253 are parallel to each other.

[0059] The side surface 253c of the side portion 253 of this spoke 250 is the portion exposed to the upper plate 310 and the lower plate 360 ​​of the insulator 300 described later (Figure 2), but the conductor wire 401 of the coil 400 is wound around the insulator 300 so as to be separated from the side surface 253c in the circumferential direction by a predetermined distance S described later and not in contact with the side surface 253c.

[0060] Since the conductive wire 401 of the coil 400 is thus configured to be spaced a predetermined distance from the side surface 253c of the spoke 250, the side surface 253c of the spoke 250 does not have to be a completely flat surface.

[0061] <Coil> Coil 400 (FIGS. 1 and 10) is formed of conductive wire 401 wound around spokes 250 of stator core 210 via upper plate 310 and lower plate 360 ​​of insulator 300 .

[0062] The conductor 401 of the coil 400 starts winding from a winding start position (not shown) on the inner side (direction of arrow d) of the spoke 250, moves toward the outer side (direction of arrow c), returns to the inner side (direction of arrow d) again, and then is wound around the adjacent spoke 250.

[0063] The conductor 401 of the coil 400 faces the side surface 253c of the spoke 250 by the upper plate 310 and the lower plate 360 ​​of the insulator 300, and is spaced a predetermined distance from the side surface 253c.

[0064] <Insulator> Next, a description will be given of the configuration of insulator 300 in stator 200. As shown in Figures 6 and 7, insulator 300 has upper plate 310 as a first plate attached to the upper side (direction of arrow a) of stator core 210, and lower plate 360 ​​as a second plate attached to the lower side (direction of arrow b) of stator core 210.

[0065] Between upper plate 310 and lower plate 360 ​​of insulator 300, ring 220, magnetic pole portion 230, and spokes 250 of stator core 210 are arranged in the vertical direction (direction of arrow ab).

[0066] The upper plate 310 and the lower plate 360 ​​have the same shape, and therefore, for convenience, only the upper plate 310 will be described here, and a detailed description of the lower plate 360 ​​will be omitted.

[0067] <Upper plate> As shown in Figure 6, the upper plate 310 has an annular portion (hereinafter referred to as the "upper annular plate") 320 that covers the upper end surface 220a of the ring 220 in the stator core 210 from above (in the direction of arrow a), a portion (hereinafter referred to as the "upper rectangular plate") 350 that covers the upper end surface 251a (Figure 4) of the first end 251 of the spoke 250 from above (in the direction of arrow a), and a portion (hereinafter referred to as the "upper tip plate") 330 that covers the upper end surface 230a (Figure 4) of the magnetic pole portion 230 from above (in the direction of arrow a).

[0068] Lower plate 360 ​​(Figure 3) also has a shape similar to that of upper plate 310, and includes an annular portion 380 (hereinafter referred to as the lower annular plate) that covers lower end surface 220b of ring 220 in stator core 210 from below (in the direction of arrow b), a portion 370 (hereinafter referred to as the lower rectangular plate) that covers lower end surface 252b (Figure 4) of second end 252 of spoke 250 from below (in the direction of arrow b), and a portion 390 (hereinafter referred to as the lower tip plate) that covers lower end surface 230b (Figure 4) of magnetic pole portion 230 from below (in the direction of arrow b).

[0069] Upper annular plate 320, upper rectangular plate 350, and upper tip plate 330 of upper plate 310 are integrally formed. However, this is not a limitation, and upper annular plate 320, upper rectangular plate 350, and upper tip plate 330 may be formed from separate members and attached to stator core 210 individually. Similarly, lower annular plate 380, lower rectangular plate 370, and lower tip plate 390 of lower plate 360 ​​are integrally formed. However, this is not a limitation, and lower annular plate 380, lower rectangular plate 370, and lower tip plate 390 may be formed from separate members and attached to stator core 210 individually.

[0070] <Upper annular plate> Upper annular plate 320 of upper plate 310 is a ring-shaped flat plate formed from a flat, annular plate-like member, and is fixed by adhesive or the like while in contact with upper end surface 220a of ring 220 of stator core 210. It is desirable that upper annular plate 320 be as thin as possible to increase the number of turns of conductive wire 401 of coil 400 or to increase the space for winding conductive wire 401.

[0071] 2, the dimension (inner diameter) of the inner circumferential portion of upper annular plate 320 is larger than the dimension (inner diameter) of the inner circumferential portion of ring 220 of stator core 210. That is, in this case, the inner circumferential portion of upper end surface 220a of ring 220 of upper annular plate 320 is exposed. However, this is not limited thereto, and the dimension (inner diameter) of the inner circumferential portion of upper annular plate 320 may be the same as or smaller than the dimension (inner diameter) of the inner circumferential portion of ring 220 of stator core 210.

[0072] The size (outer diameter) of the outer periphery of the upper annular plate 320 is slightly larger than the size (outer diameter) of the outer periphery of the ring 220 of the stator core 210. For example, the size (outer diameter) of the outer periphery of the upper annular plate 320 is formed to be larger than the size (outer diameter) of the outer periphery of the ring 220 of the stator core 210 by a predetermined amount (for example, about 0.1 mm to 0.15 mm).

[0073] That is, in this case, the upper annular plate 320 protrudes slightly outward (in the direction of arrow d) by approximately 0.1 mm to 0.15 mm from the outer peripheral surface 220g (FIG. 2) of the ring 220. This is because the conducting wire 401 of the coil 400 is disposed with a predetermined gap from the outer peripheral surface 220g of the ring 220 in the radial direction, and contact with the outer peripheral surface 220g of the ring 220 is prevented in advance.

[0074] <Upper rectangular plate> 6 and 7, upper rectangular plate 350 of upper plate 310 is a portion that is attached with adhesive or the like while in contact with upper end surfaces 251a (FIGS. 4 and 5(A)) of spokes 250 of stator core 210. Incidentally, for convenience, FIG. 7 illustrates a state in which upper tip plate 330 is separated from upper rectangular plate 350.

[0075] The upper rectangular plate 350 of the upper plate 310 extends radially from the upper annular plate 320 toward the outer periphery (in the direction of arrow c). The radial length of the upper rectangular plate 350 is the same as the radial length of the spokes 250.

[0076] Furthermore, upper rectangular plate 350 has a predetermined bending rigidity. By providing upper rectangular plate 350 with the predetermined bending rigidity, upper rectangular plate 350 can be prevented from warping upward (in the direction of arrow a) after being attached to upper end surfaces 251 a of spokes 250, and upper rectangular plate 350 is in close contact with the entire upper end surfaces 251 a of spokes 250.

[0077] In the circumferential direction, the width w1 of the upper rectangular plate 350 is larger than the width w2 (the distance between two side surfaces 253c) of the side portions 253 of the spokes 250. More specifically, in the circumferential direction, the width w1 of the upper rectangular plate 350 is formed to be larger than the width w2 of the side portions 253 of the spokes 250 by about 0.2 mm.

[0078] That is, upper rectangular plate 350 protrudes in the circumferential direction by a predetermined distance (0.2 mm) from side surface 253 c of spoke 250. However, this is not limited to this, and the amount of protrusion of upper rectangular plate 350 from side surface 253 c of spoke 250 may be 0.1 mm or less as long as conducting wire 401 of coil 400 is kept away from side surface 253 c of spoke 250 by a predetermined gap and is kept out of contact with the side surface 253 c of spoke 250.

[0079] Additionally, a plurality of recesses (or protrusions) 350r are provided on the side surface of the upper rectangular plate 350. The recesses 350r are aligned in the radial direction. Each recess 350r has a width sufficient to accommodate the conductive wire 401 of the coil 400.

[0080] The plurality of recesses 350r provided in the upper rectangular plate 350 have a width (circumferential width) and depth (radial width) sufficient to accommodate a portion of the conductor 401 of the coil 400. However, the recesses 350r may have a width and depth sufficient to accommodate the entire conductor 401.

[0081] Furthermore, among the multiple recesses 350r, two adjacent recesses 350r are spaced a predetermined distance apart in the radial direction. Flat portions (hereinafter referred to as flat portions) 350p serving as convex portions are formed between the recesses 350r in the radial direction, and the flat portions 350p have a predetermined width (in this embodiment, the same width as the recesses 350r). That is, the recesses 350r and the flat portions 350p are alternately provided in the radial direction on the side surface 350c of the upper rectangular plate 350. Note that as long as the recesses 350r and the flat portions 350p are alternately provided, the area of ​​the recesses 350r and the width of the flat portions 350p may be different.

[0082] The flat portions 350p can be regarded as protrusions relative to the recessed portions 350r. Therefore, the side surface of the upper rectangular plate 350 has a plurality of protrusions 350p arranged in the radial direction.

[0083] On both side surfaces 350c of the upper rectangular plate 350, recesses 350r and recesses 350r are formed so as to face each other back to back in the circumferential direction or in an oblique direction (a direction having a radial component and a circumferential component), and flat portions 350p and flat portions 350p are formed so as to face each other back to back in the circumferential direction.

[0084] Note that, in lower plate 360, similarly to upper plate 310, recessed portions 350r and recessed portions 350r are formed so as to face each other back to back in the circumferential direction or in an oblique direction (a direction having a radial component and a circumferential component), and flat portions 350p and flat portions 350p are formed so as to face each other back to back in the circumferential direction. Furthermore, the plurality of recessed portions 370r and the plurality of flat portions 370p provided on side surface 370c of lower rectangular plate 370 are arranged so as to face the plurality of recessed portions 350r and the plurality of flat portions 350p of upper rectangular plate 350 in the direction of rotation axis X or in an oblique direction (a direction having a radial component and a circumferential component).

[0085] <Upper tip plate> 8A and 8B, for ease of viewing, upper plate 310 is shown upside down to show upper tip plate 330. Upper tip plate 330 is fixed in contact with upper end surface 230a of magnetic pole portion 230 of stator core 210.

[0086] The upper tip plate 330 of the upper plate 310 has a main body 331 that is substantially rectangular in plan view, and a protrusion 333 provided on the main body 331. In this embodiment, the protrusion 333 is formed integrally with the main body 331. The protrusion 333 has a shape that protrudes from the main body 331 in the direction of the rotation axis X, and has an outer circumferential surface, an inner circumferential surface, and two side surfaces that connect the outer circumferential surface and the inner circumferential surface. The lower tip plate 390 also has a main body 391 and a protrusion 393 provided on the main body 391 that have the same structure as the upper tip plate 330 ( FIG. 3 ).

[0087] The protrusion 333 is provided to prevent the lead wire 401 of the coil 400 wound around the spoke 250 from becoming unwound.

[0088] The main body portion 331 of the upper tip plate 330 has a curved surface 331g with the same curvature as the outer peripheral surface 230g of the magnetic pole portion 230, side surfaces (hereinafter referred to as end surfaces) 331s extending radially from both side ends of the curved surface 331g toward the upper annular plate 320, and an inner surface 331i of the end surface 331s extending circumferentially from the end on the inner peripheral side (in the direction of arrow d) so as to approach the upper rectangular plate 350.

[0089] An engaged portion 336 is provided at a portion (corner) where an end face 331s and an inner side face 331i of the main body portion 331 intersect. This engaged portion 336 is engaged in the radial direction with an engaging portion 236 (FIGS. 5A and 5B) provided on the magnetic pole portion 230 of the stator core 210. The engaged portion 336 has a shape (for example, a polygonal prism) that protrudes from the main body portion 331 in the direction of the rotation axis X.

[0090] The main body 331 of the upper tip plate 330 has a region 331r on the outer circumferential side (in the direction of arrow c) of the engaged portion 336. This region 331r is a portion that rests on an end 230p that is provided on the outer side of the engaging portion 236 of the magnetic pole portion 230. A step is formed between the region 331r of the upper tip plate 330 and the engaged portion 336 in the direction of the rotation axis X. Therefore, the region 331r of the upper tip plate 330 is disposed at the end 230p of the magnetic pole portion 230, and the engaging portion 236 of the magnetic pole portion 230 engages with the engaged portion 336 of the upper tip plate 330. A step is also formed between the surface of the main body 331 of the upper tip plate 330 and the engaged portion 336 in the circumferential direction. Therefore, the engaging portion 236 of the magnetic pole portion 230 and the engaged portion 336 of the upper tip plate 330 engage with each other in the circumferential direction.

[0091] The engaged portion 336 of the upper tip plate 330 has an end face 336s that contacts the end face 236m of the engaging portion 236 of the magnetic pole portion 230 when the upper plate 310 is attached to the magnetic pole portion 230 of the stator core 210, and an inclined surface 336g that contacts the inner surface 230pi of the end portion 230p.

[0092] 9, for ease of viewing, the state of engagement between upper plate 310 and the electromagnetic steel plate arranged at the top of stator core 210 is shown as an upside-down cross-sectional view. This state of engagement is the same as the state of engagement between lower plate 360 ​​and the electromagnetic steel plate arranged at the bottom of stator core 210.

[0093] When the upper plate 310 of the insulator 300 is attached to the stator core 210, the inner surface 230pi of the end 230p of the magnetic pole portion 230 and the inclined surface 336g of the engaged portion 336 of the upper tip plate 330 of the upper plate 310 come into close contact in the radial direction.

[0094] At this time, the end face 236m of the engaging portion 236 of the magnetic pole portion 230 and the end face 336s of the engaged portion 336 of the upper tip plate 330 of the upper plate 310 come into close contact in the circumferential direction. However, the side face 236n of the engaging portion 236 of the magnetic pole portion 230 is located away from the engaged portion 336 of the upper tip plate 330 in the circumferential direction.

[0095] Furthermore, the inner surface 336i of the engaged portion 336 of the upper tip plate 330 protrudes a predetermined length (for example, 0.1 mm) toward the inner periphery (direction of arrow d) relative to the side surface 236n of the engaging portion 236 of the magnetic pole portion 230. In other words, the inner surface 336i of the engaged portion 336 protrudes a predetermined length (0.1 mm) toward the inner periphery (direction of arrow d) relative to the side surface 236n of the engaging portion 236 of the magnetic pole portion 230.

[0096] Therefore, when the conductor 401 of the coil 400 is wound around the spokes 250 of the stator core 210 via the upper plate 310, the conductor 401 is separated by a predetermined gap from the side surface 236n of the engaging portion 236 of the magnetic pole portion 230 and comes into contact with the inner surface 336i of the engaged portion 336 of the upper tip plate 330.

[0097] This allows the conductor 401 of the coil 400 to be configured to be spaced apart by a predetermined gap from the engaging portion 236 of the magnetic pole portion 230 of the stator core 210 and to be out of contact with it. However, in this embodiment, the curved surface 331g of the main body portion 331 and the outer circumferential surface 230g of the magnetic pole portion 230 are flush with each other and do not protrude.

[0098] In the above configuration, in motor 100 of the first embodiment, upper rectangular plate 350 of upper plate 310 in insulator 300 is attached so as to cover spokes 250 of stator core 210 from above, and lower rectangular plate 370 of lower plate 360 ​​is attached so as to cover spokes 250 of stator core 210 from below.

[0099] When the upper plate 310 is attached to the stator core 210, the two engaged portions 336 provided on the main body portion 331 of the upper tip plate 330 and the two engaging portions 236 provided on the magnetic pole portion 230 of the stator core 210 are engaged with each other in the radial and circumferential directions.

[0100] At this time, the two engaged portions 336 on the upper tip plate 330 and the two engaging portions 236 on the magnetic pole portion 230 are engaged in the radial and circumferential directions, and can therefore play a role in positioning when attaching the upper plate 310 of the insulator 300 to the stator core 210.

[0101] Here, an inner surface 230pi of the end 230p of the magnetic pole portion 230 and an inclined surface 336g of the engaged portion 336 of the upper tip plate 330 of the upper plate 310, which face each other, are in contact with each other. The inner surface 230pi of the end 230p of the magnetic pole portion 230 and the inclined surface 336g of the engaged portion 336 of the upper tip plate 330 of the upper plate 310 are in close surface contact with each other, thereby preventing displacement of the upper plate 310 in the radial direction relative to the stator core 210.

[0102] Furthermore, an end face 236m of the engaging portion 236 of the magnetic pole portion 230 and an end face 336s of the engaged portion 336 of the upper tip plate 330 of the upper plate 310, which face each other, are in contact with each other. The end face 236m of the engaging portion 236 of the magnetic pole portion 230 and the end face 336s of the engaged portion 336 of the upper tip plate 330 of the upper plate 310 are in surface contact in a tight contact state, thereby preventing misalignment of the upper plate 310 in the circumferential direction with respect to the stator core 210.

[0103] Thus, in motor 100, upper plate 310 of insulator 300 is accurately positioned relative to stator core 210 and then fixed thereto with an adhesive or the like. Similarly, in motor 100, lower plate 360 ​​of insulator 300 is accurately positioned relative to stator core 210 and then fixed thereto with an adhesive or the like.

[0104] In particular, the engaged portion 336 of the upper tip plate 330 in the upper plate 310 is positioned circumferentially further outward (toward the adjacent other magnetic pole portion 230) than the engaging portion 236 of the magnetic pole portion 230, thereby preventing the engaged portion 336 from physically interfering with the conductor 401 of the coil 400.

[0105] Furthermore, the width w1 of the upper rectangular plate 350 of the upper plate 310 and the lower rectangular plate 370 of the lower plate 360 ​​is larger than the circumferential width w2 of the spoke 250, and is formed to a size such that the upper rectangular plate 350 and the lower rectangular plate 370 each extend beyond the side surface 253c of the side portion 253 of the spoke 250.

[0106] 10 , when the conducting wire 401 of the coil 400 is wound through the upper plate 310 and the lower plate 360 ​​of the insulator 300, a gap S is formed between the conducting wire 401 and the side surface 253c of the spoke 250. Thus, the motor 100 can prevent contact between the conducting wire 401 of the coil 400 and the side surface 253c of the side portion 253 of the spoke 250.

[0107] As a result, in motor 100, even though the upper plate 310 and lower plate 360 ​​of insulator 300 expose the side surface 253c of side portion 253 of spoke 250, the conductive wire 401 of coil 400 is maintained in a non-contact state with the side surface 253c of spoke 250, and the number of turns of conductive wire 401 can be increased or the space occupied by the coil formed by conductive wire 401 can be made larger than conventional.

[0108] Thus, compared to conventional cases where insulators are attached around the entire circumference of the spokes 250, the motor 100 can increase the number of turns of the conductor 401 of the coil 400 using the insulator 300, or increase the space (area) occupied by the coil, thereby improving motor output.

[0109] In motor 100, conductor 401 of coil 400 is wound while being housed in recess 350r of upper rectangular plate 350 and recess 370r of lower rectangular plate 370. Therefore, in motor 100, conductor 401 can be brought as close as possible to side surface 253c of spoke 250 without coming into contact with it, which allows for a greater number of turns of conductor 401 or a larger space to be occupied by the coil formed after winding conductor 401.

[0110] In addition, in the motor 100, by accommodating the conductor 401 of the coil 400 in the recess 350r of the upper rectangular plate 350 and the recess 370r of the lower rectangular plate 370, it is possible to prevent the attachment position of the conductor 401 of the coil 400 relative to the spoke 250 from shifting radially.

[0111] Incidentally, the upper rectangular plate 350 of the upper plate 310 is a flat plate, and its upper end surface is a flat surface, and forms a corner that is approximately right-angled with the side surface 350c on which the recess 350r and the flat portion 350p are formed, but the conducting wire 401 of the coil 400 does not bend at 90 degrees along the corner, but is wound in a curved state relative to the corner.

[0112] Therefore, in the motor 100, a gap S is reliably formed between the conductor 401 of the coil 400 and the side surface 253c of the spoke 250, thereby preventing a short circuit between the conductor 401 and the side surface 253c of the spoke 250.

[0113] Furthermore, it is desirable that the flat upper rectangular plate 350 be as thin as possible to maximize the space occupied by the coil 400 that will be formed later, but it also has sufficient bending rigidity to prevent the upper rectangular plate 350 from warping.

[0114] As a result, in the motor 100, the upper rectangular plate 350 is maintained in close contact with the upper end surfaces 251a of the spokes 250, preventing the upper rectangular plate 350 from moving upward (in the direction of arrow a) and thereby reducing the space occupied by the coil 400, thereby improving motor output.

[0115] <Second embodiment> Next, a second embodiment of the present invention will be described. Fig. 11 is a perspective view showing a state in which an insulator 300A is attached to a stator core 210A according to the second embodiment, which is an example of the present invention (the conductor 401 of the coil 400 is not wound). Fig. 12 is an exploded perspective view showing the configuration of the stator core 210A and the insulator 300A according to the second embodiment, which is an example of the present invention (the coil 400 is not wound).

[0116] Fig. 13A is a partially enlarged perspective view showing the configuration of a stator core 210A according to a second embodiment which is an example of the present invention. Fig. 13B is a partially enlarged plan view showing the configuration of a magnetic pole portion 230A of a stator core 210A according to the second embodiment which is an example of the present invention. Fig. 14 is a perspective view showing the configuration when an upper plate 310A of an insulator 300A according to the second embodiment which is an example of the present invention is turned upside down.

[0117] Fig. 15A is a partially enlarged perspective view showing the configuration of a magnetic pole portion 330A of an insulator 300A according to a second embodiment, which is an example of the present invention. Fig. 15B is a partially enlarged plan view showing the configuration of a magnetic pole portion 330A of an insulator 300A according to the second embodiment, which is an example of the present invention.

[0118] Fig. 16 is a partially enlarged perspective view showing a state in which an insulator 300A according to a second embodiment of the present invention is attached to a stator core 210A. Fig. 17A is a plan view illustrating magnetic saturation caused by an engaging portion 236 of a magnetic pole portion 230 according to a first embodiment of the present invention. Fig. 17B is a plan view illustrating magnetic saturation caused by an engaging portion 236A of a magnetic pole portion 230A according to a second embodiment of the present invention.

[0119] The motor 100A in the second embodiment has the same basic structure as the motor 100 in the first embodiment, but differs in that it has a stator core 210A instead of the stator core 210 and an insulator 300A instead of the insulator 300, as shown in FIG. 11.

[0120] <Stator core> As shown in Figures 11 and 12, in which the same symbols are used for parts corresponding to Figures 4 and 5, stator core 210A has a ring 220, a magnetic pole portion 230A, and spokes 250 that extend radially from ring 220 toward the outer periphery (in the direction of arrow c) and connect ring 220 and magnetic pole portion 230A.

[0121] That is, stator core 210A differs from stator 200 in the first embodiment only in magnetic pole portion 230A, and only magnetic pole portion 230A will be described below. As shown in Figures 13A and 13B, magnetic pole portion 230A has engaging portion 236A instead of engaging portion 236 of magnetic pole portion 230 in the first embodiment.

[0122] The magnetic pole part 230A has an upper end face 230Aa on the upper side (in the direction of arrow a) of the portion protruding in the clockwise and counterclockwise directions, and a lower end face 230Ab on the lower side (in the direction of arrow b).

[0123] The upper end surface 230Aa of the magnetic pole portion 230A is part of the upper surface of the uppermost electromagnetic steel sheet among the multiple stacked electromagnetic steel sheets, and is a flat surface along the horizontal direction perpendicular to the direction of the rotation axis X. The lower end surface 230Ab of the magnetic pole portion 230A is part of the lower surface of the lowermost electromagnetic steel sheet among the multiple stacked electromagnetic steel sheets, and is a flat surface along the horizontal direction perpendicular to the direction of the rotation axis X. Therefore, the upper end surface 230Aa and the lower end surface 230Ab are parallel to each other.

[0124] 13B, the magnetic pole portion 230A has an outer peripheral surface 230g on the outermost side and an inner surface. The inner surface of the magnetic pole portion 230A has a portion 230Ai facing the outer peripheral surface 220g of the ring 220, an inclined portion (hereinafter referred to as the inclined surface) 236Ac, and a portion (hereinafter referred to as the engaging portion) 236A connecting the inner surface to the side surface 253c of the side portion 253 of the spoke 250. A part 230Ai of the flat inner surface is connected to the engaging portion 236A. Note that the portion connecting the inner surface to the side surface 253c of the side portion 253 of the spoke 250 may be the side surface of the spoke 250.

[0125] The inner surface 230Ai of the magnetic pole portion 230A extends from both side ends of the outer peripheral surface 230g toward the spoke 250 via the inclined surface 236Ac, and extends in a direction (circumferential direction) that intersects with the side surface 253c of the side portion 253 of the spoke 250, and in this embodiment is a flat surface that is perpendicular to the side surface 253c of the spoke 250.

[0126] At the portion where this inner surface 230Ai intersects with a side surface 253c of a side portion 253 of the spoke 250, an engagement portion 236A is formed integrally with the magnetic pole portion 230A and the spoke 250. This engagement portion 236A extends in the direction of the rotation axis X and has the shape of a quadrangular prism that is rectangular in plan view.

[0127] The two engagement portions 236A in the magnetic pole portion 230A are arranged symmetrically on the left and right sides of the spoke 250, and are provided at the end on the radially outer side (direction of arrow c) of the spoke 250 and at the end on the radially inner side (direction of arrow d) of the magnetic pole portion 230A.

[0128] The engagement portion 236A has a side surface 236As and an inner surface 236Ai. The side surface 236As of the engagement portion 236A is a flat surface that extends radially from the inner end of the inner surface 230Ai of the magnetic pole portion 230A toward the outer peripheral surface 220g of the ring 220. The side surface 236As of the engagement portion 236A is approximately parallel to the side surface 253c of the spoke 250.

[0129] The inner surface 236Ai of the engagement portion 236 is curved and inclined at an acute angle from the end of the inner circumferential side (direction of arrow d) of the side surface 236As toward the side surface 253c of the side portion 253 of the spoke 250 and toward the outer circumferential surface 220g of the ring 220.

[0130] The inclined surface 236Ac ​​of the magnetic pole portion 230A is a flat surface that extends in the circumferential direction from the engaging portion 236A of the inner surface 230Ai toward the adjacent other magnetic pole portion 230A and is inclined at an acute angle with respect to the inner surface 230Ai extending in the circumferential direction. In other words, in the magnetic pole portion 230A, the engaging portion 236A, the inner surface 230Ai, and the inclined surface 236Ac ​​are arranged symmetrically with respect to the spoke 250.

[0131] <Insulator> Also, as shown in Figures 12 and 14, the second embodiment has an upper plate 310A of insulator 300A instead of upper plate 310 of insulator 300 in the first embodiment, and a lower plate 360A of insulator 300A instead of lower plate 360.

[0132] Here, since the upper plate 310A and the lower plate 360A of the insulator 300A have the same shape, only the upper plate 310A will be described, and a detailed description of the lower plate 360A will be omitted.

[0133] Upper plate 310A has the same basic structure as upper plate 310 in the first embodiment, but has upper tip plate 330A instead of upper tip plate 330 in upper plate 310.

[0134] 15A and 15B, in which the same reference numerals are used for parts corresponding to those in FIGS. 8A and 8B, show upper plate 310A upside down for ease of viewing. Upper tip plate 330A has a main body 331 and a protrusion 333, similar to upper tip plate 330 in the first embodiment (FIG. 8A).

[0135] The main body portion 331 of the upper tip plate 330A has a curved surface 331g with the same curvature as the outer peripheral surface 230g (Figure 13A) of the magnetic pole portion 230A, end faces 331s extending from both side ends of the curved surface 331g toward the upper annular plate 320, and an engaged portion 336A formed at the end on the inner peripheral side (direction of arrow d) of the end face 331s.

[0136] The engaged portions 336A are arranged on the sides of the upper annular plate 320 at both left and right end portions of the main body portion 331, and are polygonal pillar-shaped protrusions extending in the direction of the rotation axis X from the main body portion 331. The engaged portions 336A are portions that engage with the engaging portions 236A provided on the magnetic pole portions 230A of the stator core 210.

[0137] The engaged portion 336A of the upper tip plate 330A has a flat end face 336As that contacts the side face 236As of the engaging portion 236A of the magnetic pole portion 230A when the upper plate 310A of the insulator 300A is attached to the magnetic pole portion 230A of the stator core 210, and a flat outer surface 336Ag that contacts the inner surface 230Ai of the magnetic pole portion 230A.

[0138] The engaged portion 336A of the upper tip plate 330A has an inclined surface 336Ak that is inclined radially from the outer end of the outer surface 336Ag toward the outer periphery (direction of arrow c). The engaged portion 336A also has a flat inner surface 336Ai that faces the upper annular plate 320, and a side surface (end surface) 336At that intersects (is perpendicular to) the inner surface 336Ai and is connected to the end surface 331s of the main body portion 331 so as to be flush with the inner surface 336Ai.

[0139] The engaged portion 336A of the upper tip plate 330A is a polygonal pillar-shaped protrusion that protrudes upward (in the direction of arrow a) along the direction of the rotation axis X from the main body portion 331. Therefore, corresponding to the protrusion of the engaged portion 336A, the magnetic pole portion 230A of the stator core 210A forms a region 236Ar that is engaged with the engaged portion 336A in the radial direction by the inner surface 230Ai and the inclined surface 236Ac ​​of the engaging portion 236A.

[0140] As shown in Figures 15A and 15B, the upper tip plate 330A has a flat inclined surface 331k that is further inside the engaged portion 336A and extends toward the upper rectangular plate 350 and closer to the upper annular plate 320.

[0141] When upper tip plate 330A is attached to stator core 210A, inclined surface 331k is disposed at a position closer to upper annular plate 320 in the radial direction than inner surface 236Ai of magnetic pole portion 230A. Therefore, inclined surface 331k separates conducting wire 401 of coil 400 from inner surface 236Ai of magnetic pole portion 230A by a predetermined distance, preventing conducting wire 401 of coil 400 from contacting inner surface 236Ai of magnetic pole portion 230A.

[0142] <Engagement state between stator core and insulator> 16 shows an upside-down cross section of the engagement between upper plate 310A and the electromagnetic steel plate arranged at the top of stator core 210A. The same applies to the engagement between lower plate 360A and the electromagnetic steel plate arranged at the bottom of stator core 210A.

[0143] When the upper plate 310A of the insulator 300A is attached to the stator core 210A, the inner surface 230Ai of the magnetic pole portion 230A and the outer surface 336Ag of the engaged portion 336A of the upper tip plate 330A of the upper plate 310A come into close contact with each other in the radial direction.

[0144] At this time, the side surface 236As of the engaging portion 236A of the magnetic pole portion 230A and the end surface 336As of the engaged portion 336A of the upper tip plate 330A of the upper plate 310A come into close contact with each other in the circumferential direction.

[0145] At the same time, the inclined surface 236Ac ​​of the engaging portion 236A of the magnetic pole portion 230A and the inclined surface 336Ak of ​​the engaged portion 336A of the upper tip plate 330A of the upper plate 310A come into close contact in the circumferential and radial directions.

[0146] This allows magnetic pole portion 230A of stator core 210A and upper tip plate 330A of upper plate 310A to come into close contact with each other in both the circumferential and radial directions, preventing misalignment from occurring.

[0147] Therefore, in the motor 100A of the second embodiment, when the upper plate 310A is attached to the stator core 210A, the two engaged portions 336A provided on the main body portion 331 of the upper tip plate 330A and the two engaging portions 236A provided on the magnetic pole portion 230A of the stator core 210A are engaged in a state of close contact with each other in the radial and circumferential directions.

[0148] At this time, the two engaged portions 336A of the upper tip plate 330A and the two engaging portions 236A of the magnetic pole portion 230A can play a role in positioning the upper plate 310A of the insulator 300A when it is attached to the stator core 210A.

[0149] Thus, in motor 100A, upper plate 310A of insulator 300A can be accurately positioned relative to stator core 210A and then fixed with an adhesive, etc. Similarly, in motor 100A, lower plate 360A of insulator 300A can also be accurately positioned relative to stator core 210A and then fixed with an adhesive, etc.

[0150] In particular, the engaged portion 336A of the upper tip plate 330A in the upper plate 310A is located at a position away from the spoke 250 toward the outside in the circumferential direction, and has an inclined surface 331k, so that physical contact between the conducting wire 401 of the coil 400 and the inner surface 230i of the magnetic pole portion 230A can be prevented in advance.

[0151] As shown in Fig. 17A, in motor 100 according to the first embodiment, engagement portion 236 of magnetic pole portion 230 is provided at a position away from spoke 250, whereas, as shown in Fig. 17B, in motor 100A according to the second embodiment, engagement portion 236A of magnetic pole portion 230A is provided at the portion where spoke 250 and magnetic pole portion 230A intersect (the portion where magnetic pole portion 230A and the end of spoke 250 are connected). In other words, engagement portion 236A of magnetic pole portion 230A is provided in a portion of the electromagnetic steel plate that is closer to spoke 250 in the circumferential direction than the end of magnetic pole portion 230A.

[0152] In the magnetic pole portion 230 of the first embodiment, the magnetic path L1 is narrow at the joint between the magnetic pole portion 230 and the spoke 250. In contrast, in the magnetic pole portion 230A of the second embodiment, the magnetic path L2 at the joint between the magnetic pole portion 230A and the spoke 250 is wide in the circumferential direction due to the presence of the engaging portion 236A formed on the spoke side (base portion) of the magnetic pole portion 230A.

[0153] Therefore, in the magnetic pole portion 230A in the second embodiment, when the conductor 401 of the coil 400 is wound, the area of ​​the magnetic flux passing from the spoke 250 toward the magnetic pole portion 230A (magnetic path L2) becomes larger than the magnetic path L1 of the magnetic pole portion 230 in the first embodiment, thereby suppressing the occurrence of magnetic saturation.

[0154] <Third embodiment> Next, a third embodiment of the present invention will be described. Motor 500 in the third embodiment has a basic structure in common with motor 100 in the first embodiment and motor 100A in the second embodiment, and the following description will mainly focus on the differences.

[0155] Fig. 18 is a partially enlarged perspective view showing the configuration of an upper rectangular plate 350B of an insulator 300B according to a third embodiment, which is an example of the present invention. Fig. 19 is a perspective view showing a state in which a gap S is formed between a side surface 253c of a spoke 250 and the conductive wire 401 when the conductive wire 401 of a coil 400 is wound around an upper plate 310B of an insulator 300B according to the third embodiment, which is an example of the present invention.

[0156] As shown in FIG. 18, in which parts corresponding to those in FIG. 7 are given the same reference numerals, a motor 500 according to the third embodiment has an insulator 300B instead of the insulator 300 according to the first embodiment.

[0157] The insulator 300B includes an upper plate 310B and a lower plate 360B. Again, the upper plate 310B and the lower plate 360B have the same shape, so only the upper plate 310B will be described.

[0158] Upper plate 310B has a basic structure in common with upper plate 310 of insulator 300 in the first embodiment, and has a plurality of recesses 350r and a plurality of flat portions 350p formed on both side surfaces 350c of upper rectangular plate 350B along the direction of rotation axis X. These recesses 350r and flat portions 350p are the same as those in the first and second embodiments.

[0159] An upper end surface 350Bt on one side (the direction of arrow a) of an upper rectangular plate 350B of the upper plate 310B is provided with a plurality of recesses 351r extending in the circumferential direction and a plurality of flat portions 351p. The plurality of recesses 351r and the plurality of flat portions 351p are alternately provided in the radial direction on the upper end surface 350Bt.

[0160] The recessed portion 351r and the flat portion 351p provided on the upper end surface 350Bt of the upper rectangular plate 350B are formed in a shape that extends linearly in the circumferential direction, but are not limited to this and may be formed in a curved shape in the circumferential direction.

[0161] The recesses 351r have the same width and depth as the recesses 350r formed on the side surface 350c of the upper rectangular plate 350B, and the flat portions 351p have the same width as the flat portions 350p formed on the side surface 350c of the upper rectangular plate 350B.

[0162] The widths of recessed portions 350r and 351r and flat portions 350p and 351p are larger than the dimensions (diameter) of conducting wire 401 of coil 400. However, this is not limitative, and the widths of recessed portions 350r and 351r and flat portions 350p and 351p may be the same as the dimensions (diameter) of conducting wire 401 of coil 400.

[0163] Furthermore, flat portion 351p refers to upper end surface 350Bt of upper rectangular plate 350B, and can also be considered as protrusion 351p when recess 351r is used as a reference. Therefore, it can also be said that upper rectangular plate 350B has multiple protrusions 351p formed along the circumferential direction.

[0164] Furthermore, the plurality of recesses 351r and the plurality of flat portions 351p formed on the top end surface 350Bt of the upper rectangular plate 350B are arranged so as to connect to the plurality of flat portions 350p and recesses 350r formed on the side surface 350c.

[0165] Specifically, recess 351r formed on top end surface 350Bt of upper rectangular plate 350B is connected to flat portion 350p formed on side surface 350c. Also, flat portion 351p formed on top end surface 350Bt of upper rectangular plate 350B is connected to recess 350r formed on side surface 350c.

[0166] Next, a description will be given of a case where the conducting wire 401 of the coil 400 is wound around the spokes 250 in the motor 500 according to the third embodiment. As shown in Figure 19, in which the same reference numerals are used for parts corresponding to those in Figure 10, in this motor 500, approximately half the diameter of the conducting wire 401 is accommodated in multiple recesses 351r formed in the top end surface 350Bt of the upper rectangular plate 350B, and then the conducting wire is wound so as to overlap with the flat portion 350p of the side surface 350c.

[0167] This allows the conductive wire 401 of the coil 400 and the side surface 253c of the spoke 250 to be spaced apart by a predetermined gap, preventing them from coming into contact with each other and causing a short circuit.

[0168] In the motor 500, the conductive wire 401 can be accommodated in the recess 351r in the upper end surface 350Bt of the upper rectangular plate 350B.

[0169] <Fourth embodiment> Next, a fourth embodiment of the present invention will be described. A motor 600 in the fourth embodiment has a basic structure in common with the motor 100 in the first embodiment, and the following description will focus on the different configurations.

[0170] Fig. 20 is a partially enlarged perspective view showing the configuration of an insulator 300C according to a fourth embodiment which is an example of the present invention. Fig. 21 is a partially enlarged cross-sectional view showing the shape of an insulator 300C according to the fourth embodiment which is an example of the present invention.

[0171] As shown in FIG. 20, in which parts corresponding to those in FIG. 7 are given the same reference numerals, a motor 600 according to the fourth embodiment has an insulator 300C instead of the insulator 300 according to the first embodiment.

[0172] The insulator 300C includes an upper plate 310C and a lower plate 360C. Again, the upper plate 310C and the lower plate 360C have the same shape, so only the upper plate 310C will be described.

[0173] Upper plate 310C has a basic structure common to upper plate 310 of insulator 300 in the first embodiment, and has a plurality of recesses 350r and a plurality of flat portions 350p formed on both side surfaces 350c of upper rectangular plate 350C along the direction of rotation axis X. These recesses 350r and flat portions 350p are the same as those in the first and second embodiments.

[0174] 21, upper rectangular plate 350C of upper plate 310C extends radially from upper annular plate 320 toward the outer periphery (in the direction of arrow c). The upper end surface of upper rectangular plate 350C has two curved surfaces 351Cs formed by curved surfaces extending in an arc shape so as to be convex further upward from end portions 351g on the upper sides (in the direction of arrow a) of two side end surfaces 351v extending along the rotation axis X direction, and a flat surface 351Cf connecting the two curved surfaces 351Cs in the circumferential direction.

[0175] Curved surface 351Cs of upper rectangular plate 350C is curved at an angle such that conductive wire 401 can be easily aligned along curved surface 351Cs when winding conductive wire 401 of coil 400. Flat surface 351Cf of upper rectangular plate 350C is a flat surface extending in a horizontal direction (circumferential direction) intersecting (orthogonal to) the direction of rotation axis X.

[0176] The upper rectangular plate 350C has two curved surfaces 351Cs smoothly and integrally connected to a flat surface 351Cf, forming an overall curved surface that is convex upward. Here, the ratio of the left curved surface 351Cs to the left half of the flat surface 351Cf is 4:1, and the ratio of the right curved surface 351Cs to the right half of the flat surface 351Cf is 4:1.

[0177] That is, overall, the ratio of the two curved surfaces 351Cs to the one flat surface 351Cf is 4:1, and the circumferential length of the two curved surfaces 351Cs is longer than the circumferential length of the flat surface 351Cf.

[0178] As a result, the conductor 401 of the coil 400 wound around the upper rectangular plate 350C is wound smoothly at a gentle angle due to the presence of the curved surfaces 351Cs formed by the left and right curved surfaces that occupy a larger portion than the flat surface 351Cf, thereby preventing the conductor 401 from becoming unwound.

[0179] Upper rectangular plate 350C has a semicircular cross section formed by bottom surface 351Cb, side end surface 351v, flat surface 351Cf, and curved surface 351Cs. Flat surface 351Cf of upper rectangular plate 350C and the upper end surface of upper annular plate 320 form the same plane (FIG. 20).

[0180] Furthermore, the height (thickness) h1 between the flat surface 351Cf and the end 351g of the side end surface 351v of the upper rectangular plate 350C is greater than the height (thickness) h2 between the end 351g of the side end surface 351v of the upper rectangular plate 350C and the bottom surface 351Cb.

[0181] Therefore, the conducting wire 401 of the coil 400 is bent at a gentle angle by the curved surface 351Cs that is higher than the side end surface 351v, and then extends in the rotation axis direction X along the flat side end surface 351v.

[0182] This provides a predetermined gap between the side surface 253c of the side portion 253 of the spoke 250 of the stator core 210 and the conductive wire 401 of the coil 400, preventing the conductive wire 401 from contacting (short-circuiting) with the side surface 253c of the spoke 250.

[0183] In this way, in motor 600, conductor 401 of coil 400 can be arranged along curved surface 351Cs and side end surface 351v of upper rectangular plate 350C, so that conductor 401 of coil 400 is not subjected to a load that would cause it to bend at a steep angle.

[0184] In addition, in motor 600, conductor 401 is wound as close as possible to side surface 253c of spoke 250 without coming into contact with side surface 253c of side portion 253 of spoke 250, so the number of turns of conductor 401 can be increased, improving motor output.

[0185] In motor 600, curved surface 351Cs of upper rectangular plate 350C may be formed with a recess and a flat portion curved along the arc of curved surface 351Cs. In this case, conducting wire 401 of coil 400 can be accommodated in the recess, which allows for a larger number of turns of conducting wire 401 or a larger space occupied by the coil, thereby improving motor output.

[0186] <Other embodiments> The motors 100, 100A, 500, and 600 of the preferred first to fourth embodiments of the present invention have been described above as outer rotor motors. However, the motors of the present invention are not limited to the configurations of the first to fourth embodiments, and may also be applied to inner rotor motors.

[0187] In the first embodiment of the present invention, the engaging portion 236 of the magnetic pole portion 230 is a convex portion, and the region 331r of the upper tip plate 330 is a concave portion on which the end portion 230p of the magnetic pole portion 230 is placed. However, the present invention is not limited to this, and the space adjacent to the engaging portion 236 formed by the end face 236m of the engaging portion 236 of the magnetic pole portion 230 and the inner surface 230pi of the end portion 230p may be a concave portion, and the engaged portion 336 of the upper tip plate 330 may be a convex portion.

[0188] Furthermore, in the first and second embodiments of the present invention, the description has been given of the case where recessed portions 350r and flat portions 350p of the same width are alternately arranged on the side surface 350c of the upper rectangular plate 350. However, the present invention is not limited to this, and the width of the flat portions 350p may be made smaller than the width of the recessed portions 350r, or the width of the flat portions 350p may be made larger than the width of the recessed portions 350r and alternately arranged.

[0189] Furthermore, in the third embodiment of the present invention, a case has been described in which the recess 351r formed on the upper end surface 350Bt of the upper rectangular plate 350B is connected to the flat portion 350p formed on the side surface 350c, and the flat portion 351p formed on the upper end surface 350Bt is connected to the recess 350r formed on the side surface 350c.

[0190] However, the present invention is not limited to this, and the upper rectangular plate 350B may be arranged so that the recess 351r formed on the upper end surface 350Bt is connected to the recess 350r formed on the side surface 350c, and the flat portion 351p formed on the upper end surface 350Bt is connected to the flat portion 350p formed on the side surface 350c.

[0191] Furthermore, in the fourth embodiment of the present invention, the upper rectangular plate 350C has been described as having a curved surface with a semicircular cross section formed as a whole by the curved surfaces 351Cs and the flat surface 351Cf connecting the curved surfaces 351Cs. However, the present invention is not limited to this, and the curved surface may be formed by connecting only the two curved surfaces 351Cs, or by connecting the ends 351g of the two side end surfaces 351v in a semicircular shape to form a curved surface as a whole.

[0192] In addition, those skilled in the art can appropriately modify the motor of the present invention and change the combination of various components in accordance with conventional knowledge. As long as such modifications still include the components of the present invention, they are of course included in the scope of the present invention. [Explanation of symbols]

[0193] 100, 100A, 500, 600...motor, 110...base, 111...plate, 112...outer peripheral wall, 113...inner peripheral wall, 130...shaft, 150...bearing device, 151, 153...bearing, 155...sleeve, 170...rotor, 171...rotor yoke, 172...outer peripheral portion, 173...disk portion, 174...inner peripheral portion, 175...magnet, 190...circuit board, 200...stator, 210...stator Tacore, 220... ring, 220a... upper end surface, 220b... lower end surface, 220g... outer circumferential surface, 230, 230A... magnetic pole portion, 230a... upper end surface, 230b... lower end surface, 236... engagement portion, 250... spoke, 251... first end portion, 251a... upper end surface, 252... second end portion, 252b... lower end surface, 253... side portion, 253c... side surface, 300, 300A, 300B, 300C... insulator, 310, 310A, 310B, 310C...upper plate, 360, 360A, 360B, 360C...lower plate, 400...coil, 401...conductor, 320...upper annular plate, 330, 330A...upper tip plate, 331...main body portion, 333...protrusion portion, 331g...curved surface, 331k...inclined surface, 336...engaged portion, 350, 350A, 350B, 350C...upper rectangular plate, 350c... Side, 350r, 351r...concave, 350p, 351p...flat portion (convex portion), 350At...upper end surface, 351v...side, 351g...end, 370, 370A, 370B...lower rectangular plate, 370c...side, 370r...concave, 370p...flat portion (convex portion), 351Cs...curved surface, 351Cf...flat surface, 351Cb...bottom surface, sp...coil spring, h1, h2...height (thickness), w1, w2...width.

Claims

1. The magnetic coil includes a magnetic body, an insulator that covers the magnetic body, and a coil, the magnetic body includes a magnetic pole portion, a ring, and spokes connecting the magnetic pole portion and the ring, The spoke has a first end, a second end, and a side portion between the first end and the second end in a rotational axis direction, the insulator includes a first plate covering first ends of the spokes and a second plate covering second ends of the spokes; a width of the first plate and the second plate in a circumferential direction is greater than a width of the spoke; The conductive wire forming the coil is wound around the spokes, The sides of the spokes face the conductors, The end surface of the magnetic pole portion has an engagement portion in the radial direction, the first plate has an engaged portion that engages with the engaging portion in a radial direction; Stator.

2. The surfaces of the engaging portion and the engaged portion that face each other are in contact with each other. The stator according to claim 1 .

3. the engaging portion is a convex portion that protrudes toward the ring in a radial direction, The engaged portion is a convex portion that protrudes in the direction of the rotation axis.

3. A stator according to claim 1 or 2.

4. The engaging portion is a convex portion that protrudes in a circumferential direction, The engaged portion is a convex portion that protrudes in the direction of the rotation axis.

3. A stator according to claim 1 or 2.

5. a plurality of recesses or protrusions extending in the rotation axis direction are formed on a side surface of the first plate; A stator according to any one of claims 1 to 4.

6. In the rotation axis direction, a plurality of recesses or a plurality of protrusions extending in a circumferential direction are formed on one end surface of the first plate. A stator according to any one of claims 1 to 5.

7. the first plate has a curved surface; The curved surface extends in a radial direction. A stator according to any one of claims 1 to 6.

8. The first plate has a flat plate shape. A stator according to any one of claims 1 to 7.

9. The first plate has a predetermined bending rigidity. A stator according to any one of claims 1 to 8.

10. a stator; a rotor facing the stator; Equipped with The stator includes: The magnetic coil includes a magnetic body, an insulator that covers the magnetic body, and a coil, the magnetic body includes a magnetic pole portion, a ring, and spokes connecting the magnetic pole portion and the ring, The spoke has a first end, a second end, and a side portion between the first end and the second end in a rotational axis direction, the insulator includes a first plate covering first ends of the spokes and a second plate covering second ends of the spokes; a width of the first plate and the second plate in a circumferential direction is greater than a width of the spoke; The conductive wire forming the coil is wound around the spokes, The sides of the spokes face the conductors, The end surface of the magnetic pole portion has an engagement portion in the radial direction, the first plate has an engaged portion that engages with the engaging portion in a radial direction; Motor.

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