Stator and motor

Abstract

To accurately position an insulator with respect to a stator core.SOLUTION: A stator 200 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 located between the first end part and the second end part. 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 width w1 of the second plate is larger than a width w2 of the spoke. A conductor wire 401 forming the coil 400 is wound around the spoke. The lateral part 253 of the spoke faces the conductor wire. In a radial direction, the first plate 310 has a first coating part 321 covering a lateral surface of the magnetic pole part. In the radial direction, the second plate 360 has a second coating part 335 covering the lateral surface of the magnetic pole part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] Conventionally, a stator that constitutes a motor has a ring made of an annular body provided on the inner circumference, a magnetic pole portion provided at the tip of the outer circumference, and spokes that connect the ring and the magnetic pole portion and extend radially from the ring toward the magnetic pole portion.

[0003] As one type of stator, a rotating electric machine stator has been proposed in which the insulator has an axial wall portion and a circumferential wall portion made of a thinner insulating sheet, which are integrated together, thereby improving the coil space factor within the slot and allowing the coil to be assembled to the stator teeth while being wound around the insulator (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-46880 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the rotating electric machine stator of Patent Document 1, although the coil can be wound around the insulator in advance and then assembled to the teeth of the stator, it does not disclose how to accurately position and attach the insulator relative to the stator core, which is a magnetic material.

[0006] Therefore, an object of the present invention is to provide a stator in which an insulator can be accurately positioned and attached to a stator core, which is a magnetic body, 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, the magnetic body comprising a magnetic pole portion, a ring, and spokes connecting the magnetic pole portion and the ring, the spokes comprising a first end provided on one side in the direction of the rotation axis, a second end provided on the other side in the direction of the rotation axis, and a side portion between the first end and the second end, the insulator comprising a first plate covering the first ends of the spokes and a second plate covering the second ends, the widths of the first plate and the second plate being greater than the widths of the spokes in the circumferential direction, a conducting wire forming the coil is wound around the spokes, the side portions of the spokes facing the conducting wire, the first plate having a first covering portion covering a side surface of the magnetic pole portion in the radial direction, and the second plate having a second covering portion covering a side surface of the magnetic pole portion in the radial direction. [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 according to a first embodiment of the present invention, which is an 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, as viewed obliquely from above. [Figure 5] 1 is a perspective view showing the overall configuration of an upper plate of an insulator according to a first embodiment of the present invention, as viewed obliquely from above. [Figure 6]1 is a perspective view showing the overall configuration of an insulator according to a first embodiment of the present invention, in which an upper plate is turned upside down. [Figure 7] 1 is a partially enlarged perspective view showing a state (1) in which an upper plate and a lower plate of an insulator according to a first embodiment of the present invention are attached to a stator core. FIG. [Figure 8] 1 is a partially enlarged perspective view showing a state (2) in which an upper plate and a lower plate of an insulator according to a first embodiment of the present invention are attached to a stator core. FIG. [Figure 9] 1 is a partially enlarged perspective view showing the configuration of an insulator and spokes of a stator core according to a first embodiment that is one example of the present invention. FIG. [Figure 10] FIG. 10 is a partially enlarged perspective view showing a state in which a gap is formed between the side of a spoke and the conductor when the coil conductor is wound through the upper and lower plates of an insulator according to a first embodiment of the present invention. [Figure 11] FIG. 10 is a partially enlarged perspective view showing the configuration of an insulator and spokes of a stator core according to a second embodiment of the present invention, which is an example of the present invention. [Figure 12] FIG. 10 is a partially enlarged oblique view showing a state in which a gap is formed between the side of a spoke and the conductor when the coil conductor is wound through the upper and lower plates of an insulator according to a second embodiment of the present invention. [Figure 13] 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 14] FIG. 10 is a partially enlarged cross-sectional view showing the shape of an insulator according to a third embodiment, which is one example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] <Embodiment> Hereinafter, first to third embodiments, which are examples of the present invention, will be described 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). Fig. 3 is an exploded perspective view showing the configurations of the stator core 210 and the insulator 300 according to the first embodiment, which is an example of the present invention.

[0011] Fig. 4 is a perspective view showing the overall configuration of stator core 210 according to the first embodiment, which is an example of the present invention, when viewed obliquely from above. Fig. 5 is a perspective view showing the overall configuration of upper plate 310 of insulator 300 according to the first embodiment, which is an example of the present invention, when viewed obliquely from above. Fig. 6 is a perspective view showing the overall configuration of upper plate 310 of insulator 300 according to the first embodiment, which is an example of the present invention, when turned upside down.

[0012] Fig. 7 is a partially enlarged perspective view showing a state (1) in which upper plate 310 and lower plate 360 ​​of insulator 300 according to a first embodiment which is an example of the present invention are attached to stator core 210. Fig. 8 is a partially enlarged perspective view showing a state (2) in which upper plate 310 and lower plate 360 ​​of insulator 300 according to the first embodiment which is an example of the present invention are attached to stator core 210.

[0013] Fig. 9 is a partially enlarged perspective view showing the configuration of an insulator 300 and a spoke 250 of a stator core 210 according to a first embodiment which is an example of the present invention. Fig. 10 is a partially enlarged 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 through an upper plate 310 and a lower plate 360 ​​of the insulator 300 according to the first embodiment which is an example of the present invention.

[0014] In the description of the first to third 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.

[0015] 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.

[0016] The motor 100 includes a base 110 , a shaft 130 , a bearing device 150 , a rotor 170 , and a stator 200 .

[0017] <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 from the radially outer end (direction of arrow c) of the plate 111 toward the upstream side (direction of arrow a), and a cylindrical inner peripheral portion (hereinafter referred to as the inner peripheral wall) 113 protruding a predetermined length from the radially inner end (direction of arrow d) on the other radial side of the plate 111 toward the upstream side (direction of arrow a).

[0018] 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.

[0019] 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.

[0020] <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.

[0021] <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.

[0022] Incidentally, a coil spring sp is interposed 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.

[0023] 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.

[0024] 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.

[0025] <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 provided on the inner circumferential side.

[0026] Outer periphery 172 of rotor yoke 171 is a cylindrical portion formed of a soft 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.

[0027] The disk portion 173 of the rotor yoke 171 is an approximately disk-shaped portion that extends from the upstream 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.

[0028] 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 relative to bearing 151.

[0029] 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.

[0030] <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.

[0031] 2 and 3, 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. Note that coil 400 is not shown in FIGS. 2 and 3 for ease of viewing.

[0032] Specifically, 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 .

[0033] <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.

[0034] 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. The spokes 250 and magnetic pole portions 230 form so-called teeth.

[0035] Stator core 210 is integrally formed with ring 220, magnetic pole portion 230, and spokes 250. However, for ease of explanation, stator core 210 will be explained separately as ring 220, magnetic pole portion 230, and spokes 250.

[0036] <Ring> As shown in FIG. 4, ring 220 of stator core 210 is provided on the inner circumferential side (direction of arrow d) and has an annular upper end surface 220a on the upper side (direction of arrow a) and a lower end surface 220b on the lower side (direction of arrow b).

[0037] 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.

[0038] An inner peripheral surface 220i of this ring 220 is tightly attached and fixed to the outer peripheral surface of the sleeve 155 (FIG. 1). As shown in FIGS. 3 and 4, 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).

[0039] <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.

[0040] 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.

[0041] The magnetic pole portion 230 has an upper end surface 230a on the upper side (arrow a direction) of the portion protruding in the clockwise and counterclockwise directions, a lower end surface 230b on the lower side (arrow b direction), an outer peripheral surface 230g, and an inner surface 230i.

[0042] 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.

[0043] 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.

[0044] The inner surface 230i of the magnetic pole portion is inclined from both side ends of the outer surface 230g toward the spoke 250 and toward the outer surface 220g of the ring 220, and is an inclined surface that extends to the side surface 253c of the side portion 253 of the spoke 250.

[0045] <Spokes> The spokes 250 extend radially from the outer peripheral surface 220g of the ring 220 toward the outer periphery (in the direction of the arrow c), and are portions that connect the ring 220 and the magnetic pole portion 230 together.

[0046] 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.

[0047] 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.

[0048] The upper end surface 251a of the first end 251 (FIG. 4) of the spoke 250 is part of the upper surface of the uppermost electromagnetic steel sheet among the multiple electromagnetic steel sheets stacked to form the stator core 210, and is a flat surface along the horizontal direction perpendicular to the direction of the rotation axis X.

[0049] 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.

[0050] 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.

[0051] 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 of the spoke 250 are parallel to each other.

[0052] A side surface 253c of the side portion 253 of this spoke 250 is a portion exposed to an upper plate 310 and a lower plate 360 ​​of an insulator 300, which will be described later (FIG. 2), but the conducting 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, which will be described later, and so as not to be in contact with the side surface 253c. Because the conducting wire 401 of the coil 400 has a structure in which the conducting wire 401 is separated from the side surface 253c of the spoke 250 by a predetermined distance in this manner, the side surface 253c of the spoke 250 does not need to be a completely flat surface.

[0053] <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 .

[0054] 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.

[0055] The conductive wire 401 of the coil 400 faces the side surface 253c of the spoke 250 but does not come into contact with it due to the presence of the upper plate 310 and the lower plate 360 ​​of the insulator 300.

[0056] <Insulator> Next, a description will be given of the configuration of insulator 300 in stator 200. As shown in Figures 2 and 3, 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.

[0057] 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).

[0058] 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.

[0059] <Upper plate> As shown in Figures 5 and 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 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 of the magnetic pole portion 230 from above (in the direction of arrow a).

[0060] Lower plate 360 ​​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) (Figure 3).

[0061] 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.

[0062] <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.

[0063] 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, upper annular plate 320 exposes the inner circumferential portion of upper end surface 220a of ring 220 (FIG. 2). 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.

[0064] 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 (approximately 0.1 mm to 0.15 mm).

[0065] That is, in this case, the upper annular plate 320 protrudes slightly outward (in the direction of the arrow c) by approximately 0.1 mm to 0.15 mm from the outer peripheral surface 220g (FIGS. 3 and 4) 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.

[0066] As shown in FIGS. 7 and 8, upper annular plate 320 of upper plate 310 has a plurality of walls (hereinafter referred to as ring covering portions) 321 that cover outer peripheral surfaces 220g of rings 220 of stator core 210.

[0067] The ring covering portion 321 extends downward (in the direction of arrow b) from the end of the upper annular plate 320 on the outer periphery (in the direction of arrow c) in the direction of the rotation axis X. The ring covering portion 321 is a plate-like portion that curves convexly toward the outer periphery (in the direction of arrow c) and has a rectangular or square shape in plan view. The multiple ring covering portions 321 are evenly arranged between the multiple upper rectangular plates 350.

[0068] That is, a plurality of ring covering portions 321 are provided at the outer peripheral end (in the direction of arrow c) of upper annular plate 320 at predetermined intervals (for example, the width of the slots of upper rectangular plate 350 in the circumferential direction).

[0069] In the direction of the rotation axis X, the distance (height) in the vertical direction (direction of arrow ab) of the ring covering portion 321 is approximately half the length of the ring 220 of the stator core 210, and the ring covering portion 321 covers the upper half (one side (direction of arrow a)) of the outer peripheral surface 220g of the ring 220.

[0070] The size (inner diameter) of the ring covering portion 321 is the same as the size (outer diameter) of the outer peripheral surface 220g of the ring 220 of the stator core 210. Therefore, the ring covering portion 321 is in close contact with the outer peripheral surface 220g of the ring 220.

[0071] However, the present invention is not limited to this, and the inner diameter of the ring covering portion 321 may be slightly larger than the outer diameter of the outer peripheral surface 220g of the ring 220.

[0072] 3, the lower plate 360 ​​also has a lower annular plate 380 having the same configuration as the upper annular plate 320. Therefore, the lower annular plate 380 has a plurality of ring covering portions 381 having the same configuration as the ring covering portions 321 of the upper annular plate 320.

[0073] At the outer peripheral end (in the direction of arrow c) of lower annular plate 380, a plurality of ring covering portions 321 are provided at predetermined intervals (for example, the width of the slots of lower rectangular plate 370 in the circumferential direction).

[0074] In the direction of the rotation axis X, the distance (height) in the vertical direction (direction of arrow ab) of the ring covering portion 381 is approximately half the length of the ring 220 of the stator core 210, and the ring covering portion 321 covers the lower half (one side (direction of arrow b)) of the outer peripheral surface 220g of the ring 220. The size (inner diameter) of the ring covering portion 381 is the same as the size (outer diameter) of the outer peripheral surface 220g of the ring 220 of the stator core 210. Therefore, the ring covering portion 381 is in close contact with the outer peripheral surface 220g of the ring 220. However, this is not a limitation, and the inner diameter of the ring covering portion 381 may be slightly larger than the outer diameter of the outer peripheral surface 220g of the ring 220.

[0075] The ring covering portion 321, which is a part of the upper plate 310, and the ring covering portion 381, which is a part of the lower plate 360, face each other in the vertical direction (the direction of the arrow ab), with a predetermined gap (separate) between them (Figures 7 and 8).

[0076] The ring covering portion 321 and the ring covering portion 381 may be in contact with each other, or the ring covering portion 321 and the ring covering portion 381 may be overlapped with each other in a partially overlapping state.

[0077] <Upper rectangular plate> Upper rectangular plate 350 of upper plate 310 is a portion that is attached with an adhesive or the like while being in contact with upper end surfaces 251a of spokes 250 of stator core 210. The radial length of upper rectangular plate 350 is the same as the radial length of spokes 250.

[0078] 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 upper end surfaces 251 a of spokes 250 as a whole.

[0079] As shown in FIG. 9, the width w1 of the upper rectangular plate 350 in the circumferential direction is greater than the width w2 of the side portion 253 of the spoke 250 (the distance between the two side surfaces 253c of the side portion 253).

[0080] More specifically, in the circumferential direction, width w1 of upper rectangular plate 350 is formed to be approximately 0.2 mm larger than width w2 of side portions 253 of spokes 250. For convenience, Fig. 9 illustrates a state in which upper tip plate 330 and lower tip plate 390 are separated from upper rectangular plate 350.

[0081] That is, upper rectangular plate 350 protrudes in the circumferential direction by a predetermined distance (0.1 mm) from side surface 235 c of spoke 250. However, this is not limited to this, and the amount of protrusion of upper rectangular plate 350 from side surface 235 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.

[0082] A plurality of recesses (or protrusions) 350r are provided on the side surface of the upper rectangular plate 350. The recesses 350r are arranged in the radial direction. Each recess 350r has a width sufficient to accommodate the conductive wire 401 of the coil 400 in the radial direction.

[0083] 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 also have a width and depth sufficient to accommodate the entire conductor 401.

[0084] 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 dimensions (widths) of the recesses 350r and the widths of the flat portions 350p do not need to be different.

[0085] 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.

[0086] 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.

[0087] 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).

[0088] <Upper tip plate> 7 and 8, upper tip plate 330 of upper plate 310 is a portion that is fixed with an adhesive or the like while in contact with upper end surface 230a of magnetic pole portion 230 of stator core 210. Upper tip plate 330 has a bottom surface that is the same size as upper end surface 230a of magnetic pole portion 230.

[0089] As shown in Figures 5 to 8, the upper tip plate 330 has an end 331 extending circumferentially from the upper rectangular plate 350, a protruding portion (wall) 333 having a rectangular parallelepiped shape protruding upward (in the direction of arrow a) from the end 331, and a covering portion (wall) 335 as a first covering portion protruding downward from the end 331.

[0090] The end 331 of the upper tip plate 330 has the same shape as the upper end surface 230a of the magnetic pole portion 230, and has a curved surface (hereinafter referred to as the "curved surface") 331g on the outermost side, and two side portions 331k that are inclined obliquely from both ends of the curved surface 331g toward the inner side (in the direction of arrow d) so as to approach the upper rectangular plate 350.

[0091] The protrusion 333 of the upper tip plate 330 is a protruding portion of approximately rectangular parallelepiped shape formed integrally on the end portion 331, and is provided to prevent the wire 401 of the coil 400 wound around the spokes 250 of the stator core 210 from becoming unwound.

[0092] This covering portion 335 has a rectangular or square shape in plan view extending downward (in the direction of arrow b) in the direction of the rotation axis X from the side portion 331k of the end portion 331 of the upper tip plate 330, and is a plate-like portion that covers the side surface (hereinafter referred to as the inner surface) 230i of the magnetic pole portion 230 in the stator core 210.

[0093] At end 331, covering portions 335 are provided integrally with two side portions 331k, respectively, and covering portions 335 are provided symmetrically on the left and right sides of upper rectangular plate 350. That is, covering portions 335 of upper tip plate 330 are provided integrally with end 331 along side portions 331k of upper tip plate 330.

[0094] The distance (height) in the vertical direction (direction of arrow ab) of the covering portion 335 is approximately half the height of the magnetic pole portion 230 of the stator core 210, and is long enough for the covering portion 335 to cover the upper half of one side (direction of arrow a) of the inner surface 230i of the magnetic pole portion 230 in the direction of the rotation axis X.

[0095] Furthermore, the upper plate 310 of the insulator 300 is attached to the stator core 210, and the covering portion 335 and the inner surface 230i of the magnetic pole portion 230 are in close contact with each other.

[0096] 3 and 7, lower plate 360 ​​also has a lower annular plate 380, a lower rectangular plate 370, and a lower tip plate 390, which have the same configuration as upper tip plate 330. Therefore, lower tip plate 390 has covering portions 395 as a plurality of second covering portions, which have the same configuration as covering portion 335 of upper annular plate 320.

[0097] The distance (height) in the vertical direction (direction of arrow ab) of the covering portion 395 of this lower plate 360 ​​is approximately half the height of the magnetic pole portion 230 of the stator core 210, and is long enough for the covering portion 395 to cover the lower half of the other side (direction of arrow b) of the inner surface 230i of the magnetic pole portion 230 in the direction of the rotation axis X.

[0098] As shown in FIG. 7, there is a predetermined gap (separation) between covering portion 335, which is a part of upper plate 310, and covering portion 395, which is a part of lower plate 360, in the vertical direction (direction of arrow ab).

[0099] However, as long as the upper plate 310 and the lower plate 360 ​​are separated from each other in the vertical direction (the direction of the arrow ab), the covering portion 335 and the covering portion 395 may be in contact with each other, or the covering portion 335 and the covering portion 395 may be stacked in a partially overlapping state.

[0100] In the above configuration, in motor 100, side surfaces 253c of side portions 253 are exposed to spokes 250 of stator core 210, but upper end surfaces 251a of spokes 250 are covered by upper rectangular plate 350 of upper plate 310, and lower end surfaces 252b of spokes 250 are covered by lower rectangular plate 370 of lower plate 360.

[0101] In this case, 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 formed to be larger than the width w2 between the side surfaces 253c on both sides of the side portions 253 of the spokes 250. Therefore, the upper rectangular plate 350 and the lower rectangular plate 370 each extend beyond the side surfaces 253c of the side portions 253 of the spokes 250.

[0102] As a result, in motor 100, as shown in Figure 10, when conductor 401 of coil 400 is wound through upper rectangular plate 350 of upper plate 310 and lower rectangular plate 370 of lower plate 360, conductor 401 faces side surface 253c of side portion 253 of spoke 250, but a gap S is formed between the two.

[0103] Thus, motor 100 can physically and structurally prevent the conductor 401 of coil 400 from coming into contact with spokes 250 of stator core 210 and causing a short circuit.

[0104] Upper rectangular plate 350 is a flat plate with a flat upper end surface, and side surface 350c on which recess 350r and flat portion 350p are formed forms a substantially right-angled corner with the upper end surface of upper rectangular plate 350. However, when winding conductor 401 of coil 400, conductor 401 is not bent 90 degrees along the corner, but is wound in a curved state relative to the corner.

[0105] Therefore, a gap S is reliably formed between the conductive wire 401 of the coil 400 and the side surface 253c of the spoke 250, and the occurrence of a short circuit between the conductive wire 401 and the spoke 250 can be prevented.

[0106] In addition, in the motor 100, the conductor 401 of the coil 400 is wound while being accommodated in the recess 350r of the upper rectangular plate 350 and the recess 370r of the lower rectangular plate 370, so that the winding position of the conductor 401 can be prevented from shifting radially.

[0107] 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, but that it have sufficient bending rigidity to prevent the upper rectangular plate 350 from warping.

[0108] This allows the motor 100 to maintain the upper rectangular plate 350 in close contact with the upper end surfaces 251a of the spokes 250, preventing the space occupied by the coils 400 from being reduced and improving motor output.

[0109] Furthermore, as shown in FIG. 2, in motor 100, outer peripheral surface 220g of ring 220 of stator core 210 is covered by multiple ring covering portions 321 on upper rectangular plate 350 and multiple ring covering portions 381 on lower rectangular plate 370.

[0110] Similarly, in motor 100, inner surfaces 230i of magnetic pole portions 230 of stator core 210 are covered by a plurality of covering portions 335 on upper rectangular plate 350 and a plurality of covering portions 395 on lower rectangular plate 370.

[0111] As a result, in motor 100, the radial positions of upper plate 310 and lower plate 360 ​​relative to stator core 210 are determined by the presence of ring covering portion 321, ring covering portion 381, covering portion 335, and covering portion 395. Thus, motor 100 can be mounted with upper plate 310 and lower plate 360 ​​accurately positioned relative to stator core 210.

[0112] Furthermore, when the upper plate 310 and the lower plate 360 ​​of the insulator 300 are attached to the stator core 210 of the motor 100, the outer peripheral surface 220g of the ring 220 is covered by the ring covering portion 321 and the ring covering portion 381, and the inner peripheral surface 230i of the magnetic pole portion 230 is covered by the covering portion 335 and the covering portion 395.

[0113] This prevents the conductor 401 of the coil 400 from coming into contact with the outer surface 220g of the ring 220 and the inner surface 230i of the magnetic pole portion 230 and causing a short circuit when the conductor 401 is wound around the spoke 250 via the upper rectangular plate 350 and the lower rectangular plate 370 in the motor 100.

[0114] Therefore, in motor 100, conducting wire 401 of coil 400 can be wound to the maximum extent possible around spokes 250 of stator core 210 between ring 220 and magnetic pole portion 230, thereby efficiently improving motor output.

[0115] <Second embodiment> Next, a second embodiment of the present invention will be described. A motor 500 in the second 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.

[0116] Fig. 11 is a partially enlarged perspective view showing the configuration of an insulator 300A and a spoke 250 of a stator core 210 according to a second embodiment which is an example of the present invention. Fig. 12 is a partially enlarged 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 via an upper plate 310A and a lower plate 360A of an insulator 300A according to the second embodiment which is an example of the present invention.

[0117] As shown in FIG. 11, in which parts corresponding to those in FIG. 9 are given the same reference numerals, a motor 500 according to the second embodiment has an insulator 300A instead of the insulator 300 according to the first embodiment.

[0118] The insulator 300A includes an upper plate 310A and a lower plate 360A. In this case, the upper plate 310A and the lower plate 360A have the same shape, so only the upper plate 310A will be described and a detailed description of the lower plate 360A will be omitted.

[0119] Upper plate 310A has the same basic structure as upper plate 310 of insulator 300 in the first embodiment, and has the plurality of ring covering portions 321 and the plurality of covering portions 335 described above.

[0120] Additionally, upper plate 310A is provided with a plurality of recesses 350r and a plurality of flat portions 350p formed along the direction of rotation axis X on side surfaces 350c on both sides of upper rectangular plate 350A. These recesses 350r and flat portions 350p are the same as those in the first embodiment.

[0121] An upper end surface 350At on one side (the direction of arrow a) of an upper rectangular plate 350A of the upper plate 310A 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 350At.

[0122] The recessed portion 351r and the flat portion 351p provided on the upper end surface 350At of the upper rectangular plate 350A 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.

[0123] These recesses 351r have the same width and depth as the recesses 350r formed on the side surface 350c of the upper rectangular plate 350A, and these flat portions 351p have the same width as the flat portions 350p formed on the side surface 350c of the upper rectangular plate 350A.

[0124] The widths of recesses 350r and 351r and the widths of 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 recesses 350r and 351r and the widths of flat portions 350p and 351p may be the same as the dimensions (diameter) of conducting wire 401 of coil 400.

[0125] Furthermore, flat portion 351p refers to upper end surface 350At of upper rectangular plate 350A, 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 350A has multiple protrusions 351p formed along the circumferential direction of upper end surface 350At.

[0126] Furthermore, the plurality of recesses 351r and the plurality of flat portions 351p formed on the top end surface 350At of the upper rectangular plate 350A are arranged so as to connect to the plurality of flat portions 350p and recesses 350r formed on the side surface 350c.

[0127] Specifically, the recess 351r formed on the top end surface 350At of the upper rectangular plate 350A is connected to the flat portion 350p formed on the side surface 350c. Also, the flat portion 351p formed on the top end surface 350At of the upper rectangular plate 350A is connected to the recess 350r formed on the side surface 350c.

[0128] Next, a description will be given of a case where the conductor 401 of the coil 400 is wound around the spokes 250 in the motor 500 according to the second embodiment. As shown in Fig. 12, in this motor 500, about half the diameter of the conductor 401 is accommodated in a plurality of recesses 351r formed in the top end surface 350At of the upper rectangular plate 350A, and the conductor 401 is wound so as to overlap with the flat portion 350p of the side surface 350c.

[0129] This allows the conductive wire 401 of the coil 400 and the side surface 253c of the side portion 253 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.

[0130] Furthermore, in the motor 500, as in the first embodiment, the outer peripheral surface 220g of the ring 220 is covered by a plurality of ring covering portions 321 and a plurality of ring covering portions 381, and the inner peripheral surface 230i of the magnetic pole portion 230 is covered by a plurality of covering portions 335 and a plurality of covering portions 395.

[0131] This makes it possible to prevent the conductive wire 401 of the coil 400 from coming into contact with the outer circumferential surface 220g of the ring 220 of the stator core 210 and the inner circumferential surface 230i of the magnetic pole portion 230, resulting in a short circuit.

[0132] In the motor 500, the conductive wire 401 can be accommodated in the recess 351r in the top end surface 350At of the upper rectangular plate 350A.

[0133] <Third embodiment> Next, a third embodiment of the present invention will be described. A motor 600 in the third embodiment has a basic structure in common with the motor 100 in the first embodiment, and the following description will focus on the differences.

[0134] Fig. 13 is a partially enlarged perspective view showing the configuration of an insulator 300B according to a third embodiment which is an example of the present invention. Fig. 14 is a partially enlarged cross-sectional view showing the shape of an insulator 300B according to the third embodiment which is an example of the present invention.

[0135] As shown in FIGS. 13 and 14, in which parts corresponding to those in FIG. 9 are given the same reference numerals, a motor 600 according to the third embodiment has an insulator 300B instead of the insulator 300 according to the first embodiment.

[0136] The insulator 300B includes an upper plate 310B and a lower plate 360B. In this case as well, the upper plate 310B and the lower plate 360B have the same shape, so only the upper plate 310B will be described and a detailed description of the lower plate 360B will be omitted.

[0137] Upper plate 310B has a basic structure in common with upper plate 310 of insulator 300 in the first embodiment, and is provided with a plurality of recesses 350r and a plurality of flat portions 350p formed along the direction of rotation axis X on side surfaces 350c extending along the direction of rotation axis X on both sides of upper rectangular plate 350B. These recesses 350r and flat portions 350p are the same as those in the first and second embodiments.

[0138] Upper rectangular plate 350B of upper plate 310B 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 350B has two curved surfaces 351Bs, each of which is a curved surface extending in an arc shape so as to be convex upward from end portions 351g on the upper side (in the direction of arrow a) of two flat side end surfaces 351v extending along the rotation axis X, and a flat surface 351Bf connecting the two curved surfaces 351Bs in the circumferential direction.

[0139] Curved surface 351Bs of upper rectangular plate 350B is curved at an angle such that conductive wire 401 of coil 400 can be easily aligned along curved surface 351Bs when winding the conductive wire 401. Flat surface 351Bf of upper rectangular plate 350B is a flat surface extending in a horizontal direction (circumferential direction) intersecting (orthogonal to) the direction of rotation axis X.

[0140] Upper rectangular plate 350B has two curved surfaces 351Bs smoothly and integrally connected to flat surface 351Bf, forming an overall curved surface that is convex upward. Here, the ratio of left curved surface 351Bs to the left half of flat surface 351Bf is 4:1, and the ratio of right curved surface 351Bs to the right half of flat surface 351Bf is 4:1.

[0141] That is, overall, the ratio of the two curved surfaces 351Bs to the one flat surface 351Bf is 4:1, and the circumferential length of the two curved surfaces 351Bs is longer than the circumferential length of the flat surface 351Bf.

[0142] As a result, the conductor 401 of the coil 400 wound around the upper rectangular plate 350B is wound smoothly at a gentle angle due to the presence of the curved surface 351Bs consisting of left and right curved surfaces that occupy a larger portion than the flat surface 351Bf, thereby preventing the conductor 401 from becoming unwound.

[0143] Upper rectangular plate 350B has a semicircular cross section formed by bottom surface 351Bb, side end surface 351v, flat surface 351Bf, and curved surface 351Bs. Flat surface 351Bf of upper rectangular plate 350B and the upper end surface of upper annular plate 320 form the same plane (FIG. 13).

[0144] In addition, the height (thickness) h1 between the flat surface 351Bf and the end 351g of the side end surface 351v of the upper rectangular plate 350B is greater than the height (thickness) h2 between the end 351g of the side end surface 351v of the upper rectangular plate 350B and the bottom surface 351Bb.

[0145] Therefore, the conducting wire 401 of the coil 400 is bent at a gentle angle by the curved surface 351Bs, which is higher than the side end surface 351v, and then extends in the rotation axis direction X along the flat side end surface 351v that is aligned with the rotation axis X direction.

[0146] 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.

[0147] In this way, in motor 600, conductor 401 of coil 400 can be arranged along curved surface 351Bs and side end surface 351v of upper rectangular plate 350B, so that conductor 401 of coil 400 is not subjected to a load that would cause it to bend at a steep angle.

[0148] Furthermore, in the motor 600, the conductor 401 is wound as close as possible to the side surface 253c of the side portion 253 of the spoke 250 without coming into contact with the side surface 253c of the side portion 253 of the spoke 250, so that the number of turns of the conductor 401 can be increased, thereby improving the output of the motor.

[0149] In motor 600, curved surface 351Bs of upper rectangular plate 350B may be formed with a curved recess and a flat portion that are curved along the arc of curved surface 351Bs. In this case, the number of turns of conducting wire 401 of coil 400 can be increased, or the space occupied by the coil can be increased, thereby improving motor output.

[0150] <Other embodiments> The motors 100, 500, and 600 of the preferred first to third 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 third embodiments, and may also be applied to inner rotor motors.

[0151] Furthermore, in the first to third embodiments of the present invention, the recessed portions 350r and flat portions 350p having 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 arranged alternately.

[0152] Furthermore, in the second embodiment of the present invention, the case has been described in which the recess 351r formed on the upper end surface 350At of the upper rectangular plate 350A is connected to the flat portion 350p formed on the side surface 350c, and the flat portion 351p formed on the upper end surface 350At is connected to the recess 350r formed on the side surface 350c.

[0153] However, the present invention is not limited to this, and the upper rectangular plate 350A may be arranged so that the recess 351r formed on the upper end surface 350At is connected to the recess 350r formed on the side surface 350c, and the flat portion 351p formed on the upper end surface 350At is connected to the flat portion 350p formed on the side surface 350c.

[0154] Furthermore, in the third embodiment of the present invention, the upper rectangular plate 350B has been described as having a curved surface with a semicircular cross section formed as a whole by the curved surface 351Bs and the flat surface 351Bf connecting both curved surfaces 351Bs. However, the present invention is not limited to this, and the curved surface may be formed by connecting only two curved surfaces 351Bs, or by connecting the ends 351g of two side end surfaces 351v in a semicircular shape to form a curved surface as a whole.

[0155] 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]

[0156] 100, 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 core, 2 20... ring, 220a... upper end surface, 220b... lower end surface, 220g... outer surface, 230... magnetic pole portion, 230a... upper end surface, 230b... lower end surface, 230i... inner surface, 230g... outer surface, 250... spoke, 251... first end, 251a... upper end surface, 252... second end, 252b... lower end surface, 253... side portion, 253c... side surface, 300, 300A, 300B... insulator, 310, 310A, 310B...upper plate, 360, 360A, 360B...lower plate, 400...coil, 401...conductor, 320...upper annular plate, 321, 381...ring coating, 330...upper tip plate, 331...end, 333...protrusion, 331g...curved surface, 331k...side, 335, 395...coating, 350, 350A, 350B...upper rectangular plate, 350c...side, 350r, 35 1r...recess, 350p, 351p...flat portion (convex portion), 350At...upper end surface, 351v...side end surface, 370, 370A, 370B...lower rectangular plate, 370c...side surface, 370r...recess, 370p...flat portion (convex portion), 351Bs...curved surface, 351Bf...flat surface, 351Bb...bottom surface, 351v...side end surface, 351g...end portion, 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 spokes include a first end provided on one side in the rotation axis direction, a second end provided on the other side in the rotation axis direction, and a side portion located between the first end and the second end, the insulator includes a first plate covering the first ends of the spokes and a second plate covering the second ends of the spokes; a width of the first plate and a width of the second plate are greater than a width of the spokes in a circumferential direction; The conductive wire forming the coil is wound around the spokes, The sides of the spokes face the conductors, the first plate has a first covering portion that covers a side surface of the magnetic pole portion in a radial direction, the second plate has a second covering portion that covers a side surface of the magnetic pole portion in the radial direction; Stator.

2. the first covering portion and the second covering portion cover an inner circumferential surface of the magnetic pole portion on the ring side; The stator according to claim 1 .

3. the first covering portion and the second covering portion are spaced apart in the rotation axis direction; The stator according to claim 1 .

4. the first plate and the second plate are exposed to the sides of the spokes; A stator according to any one of claims 1 to 3.

5. the first plate and the second plate have an annular plate that covers the ring; The annular plate has a portion covering the outer circumferential surface of the ring. A stator according to any one of claims 1 to 4.

6. 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 5.

7. 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 6.

8. One end surface of the first plate is a curved surface. A stator according to any one of claims 1 to 7.

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

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

11. 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; In a circumferential direction, a width of the first plate and a width of the second plate are greater than a width of the spoke in the circumferential direction; The conductive wire forming the coil is wound around the spokes, the side of the spoke faces the conductor; the first plate has a first covering portion that covers a side surface of the magnetic pole portion in a radial direction, the second plate has a second covering portion that covers a side surface of the magnetic pole portion in the radial direction; Motor.

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