Stator and motor

Abstract

To provide a stator and a motor which can increase a winding area of a conductor wire.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 and a second end part 252 which are provided on one side and the other side in a rotation axis direction; and a lateral part 253. The insulator has: a first plate 310 covering the first end part; a second plate 360 covering the second end part; and an upper annular plate 320 covering the ring. In a circumferential direction, a width w1 of the first plate and the second plate is larger than a width w2 in the circumferential direction of the spoke. A conductor wire of the coil is wound around the spoke. The lateral part of the spoke faces the conductor wire. A plurality of recesses 350r or protrusions 350p extending in the rotation axis direction are formed on a lateral surface of the first plate.SELECTED DRAWING: Figure 6

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] In a stator, insulators are attached to the spokes to ensure insulation between the spokes and the coil conductors, and the coil conductors are wound around the insulators. Also, a rotating electric machine stator has been proposed in which the coil conductors are wound around two insulators separated in the axial direction to improve insulation (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-116270 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the rotating electric machine stator of Patent Document 1, the number of turns of the coil wire and the winding space are reduced by the amount of increase in thickness caused by providing a corrugated portion in the radial direction of the insulator, making it unsuitable for improving the output of the motor.

[0006] Therefore, an object of the present invention is to provide a stator that can increase the number of coil turns or the space occupied by the coil, 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 a first end provided on one side in the direction of the rotation axis, a second end provided on the other side, 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, a second plate covering the second ends of the spokes, and an annular plate covering the ring, wherein the widths of the first plate and the second plate in the circumferential direction are greater than the width of the spokes, a conductive wire forming the coil is wound around the spokes, the side portions of the spokes face the conductive wire, and a plurality of recesses or protrusions extending in the direction of the rotation axis are formed on the side of the first plate. [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 the overall configuration of a stator core according to a first embodiment of the present invention; [Figure 3] 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 4] 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 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 below. [Figure 6] 1 is a partially enlarged perspective view showing the configuration of an insulator and spokes of a stator core according to a first embodiment of the present invention, which is an example of the present invention. FIG. [Figure 7] FIG. 1 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 around an insulator according to a first embodiment of the present invention. [Figure 8] FIG. 4 is a partially enlarged perspective view showing the configuration of an insulator according to a second embodiment, which is an example of the present invention. [Figure 9] 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 around an insulator according to a second embodiment of the present invention. [Figure 10] 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 11] 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. [Figure 12] FIG. 10 is a diagram for explaining a modified example of the present invention. [Figure 13] FIG. 10 is a diagram for explaining another modified 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 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 of the present invention. Fig. 2 is a perspective view showing the overall configuration of a stator core 210 according to the first embodiment of the present invention.

[0011] Fig. 3 is a perspective view showing a state in which insulator 300 is attached to stator core 210 according to a first embodiment which is an example of the present invention (conductor 401 of coil 400 is not wound). Fig. 4 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. 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 below.

[0012] Fig. 6 is a partially enlarged 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. 7 is a partially enlarged perspective view showing a state in which a gap S is formed between a side surface 253c of the spoke 250 and the conductive wire 401 when the conductive wire 401 of the coil 400 is wound around the insulator 300 according to the first embodiment which is an example of the present invention.

[0013] 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.

[0014] 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 single-phase brushless DC motor or other motors.

[0015] The motor 100 includes a base 110 , a shaft 130 , a bearing device 150 , a rotor 170 , and a stator 200 .

[0016] <Bass> The base 110 of the motor 100 is formed by 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.

[0017] Plate 111 is disposed radially between inner circumferential wall 113 and outer circumferential wall 112 of base 110, and in the axial direction, the end of inner circumferential wall 113 is formed longer (higher) in the direction of rotation axis X than the 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.

[0018] 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.

[0019] <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.

[0020] <Bearing device> The bearing device 150 is formed by an upper bearing 151, a lower bearing 153, and a sleeve 155. The upper bearing 151 and the lower bearing 153 are, for example, ball bearings. Note that the bearings 151 and 153 are not limited to ball bearings and may be various other bearings, such as a sleeve bearing.

[0021] 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.

[0022] 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.

[0023] Upper bearing 151 is disposed above shaft 130 (in the direction of arrow a) and supports the upper side 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 side 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.

[0024] <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.

[0025] 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.

[0026] 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.

[0027] Inner peripheral portion 174 of rotor yoke 171 is a substantially 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.

[0028] 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.

[0029] <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.

[0030] <Stator core> 2 and 3, 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 stator core 210 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.

[0031] 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.

[0032] The stator core 210 is integrally formed with a ring 220, a magnetic pole portion 230, and spokes 250. However, for ease of explanation, the stator core 210 will be explained separately as the ring 220, the magnetic pole portion 230, and the spokes 250.

[0033] <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).

[0034] 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 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.

[0035] 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). A plurality of spokes 250 extend radially from an outer peripheral surface 220g of the ring 220 toward the outer periphery (direction of arrow c).

[0036] <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.

[0037] 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.

[0038] 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).

[0039] 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.

[0040] <Spokes> The spokes 250 extend radially from the outer peripheral surface 220g of the ring 220 toward the outer periphery (in the direction of arrow c) and are portions that connect the ring 220 and the magnetic pole portion 230. The spokes 250 have a rectangular parallelepiped shape that is rectangular in plan view and extends in the direction of the rotation axis X. However, the shape is not limited to this, and the spokes 250 may have, for example, a tapered trapezoid shape in plan view that gradually becomes thinner from the ring 220 toward the magnetic pole portion 230.

[0041] 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.

[0042] The upper end surface 251a of the first end 251 (FIG. 2) of the spoke 250 is part of the upper surface of the uppermost electromagnetic steel sheet among the multiple laminated electromagnetic steel sheets that make up the stator core 210, and is a flat surface that extends along a horizontal direction perpendicular to the direction of the rotation axis X.

[0043] The lower end surface 252b of the second end 252 of the spoke 250 is part of the lower surface of the electromagnetic steel sheet arranged at the bottom among the plurality of 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 251a and the lower end surface 252b are parallel to each other.

[0044] An upper end surface 251a of the first end portion 251 of the spoke 250 is connected to be flush with an upper end surface 220a of the ring 220 and an upper end surface 230a of the magnetic pole portion 230. Similarly, a lower end surface 252b of the second end portion 252 of the spoke 250 is connected to be flush with a lower end surface 220b of the ring 220 and a lower end surface 230b of the magnetic pole portion 230.

[0045] 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 flat 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.

[0046] 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. 3), but the conductor 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 come into contact with the side surface 253c. Because the conductor 401 of the coil 400 has a structure in which the conductor 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.

[0047] <Coil> Coil 400 (FIGS. 1 and 7) 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 .

[0048] 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.

[0049] 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.

[0050] <Insulator> Next, a description will be given of the configuration of the insulator 300 in the stator 200. As shown in Fig. 3, the insulator 300 has an upper plate 310 as a first plate attached to the upper side (direction of arrow a) of the stator core 210, and a lower plate 360 ​​as a second plate attached to the lower side (direction of arrow b) of the stator core 210.

[0051] 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). Upper plate 310 and lower plate 360 ​​have the same shape. Therefore, for convenience, only upper plate 310 will be described here, and a detailed description of lower plate 360 ​​will be omitted.

[0052] <Upper plate> As shown in Figures 4 and 5, 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).

[0053] Lower plate 360 ​​also has a shape similar to that of upper plate 310, and includes an annular portion (hereinafter referred to as the lower annular plate) 380 that covers lower end surface 220b of ring 220 in stator core 210 from below (in the direction of arrow b), a portion (hereinafter referred to as the lower rectangular plate) 370 that covers lower end surface 252b (FIG. 4) of second end 252 of spoke 250 from below (in the direction of arrow b), and a lower tip plate 390 (FIG. 3).

[0054] In upper plate 310, upper annular plate 320, upper rectangular plate 350, and upper tip plate 330 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, in lower plate 360, lower annular plate 380, lower rectangular plate 370, and lower tip plate 390 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.

[0055] <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 the space for winding conductive wire 401.

[0056] 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. 3). 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.

[0057] 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).

[0058] 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 circumferential surface 220g (FIGS. 2 and 3) of the ring 220. This is because the conducting wire 401 of the coil 400 is arranged with a predetermined gap from the outer circumferential surface 220g of the ring 220 in the radial direction, and contact with the outer circumferential surface 220g of the ring 220 is avoided.

[0059] <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.

[0060] 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.

[0061] As shown in Fig. 6, the width w1 of the upper rectangular plate 350 in the circumferential direction is larger than the width w2 (the distance between two side surfaces 253c) of the side portions 253 of the spokes 250. More specifically, the width w1 of the upper rectangular plate 350 in the circumferential direction is formed to be approximately 0.2 mm larger than the width w2 of the side portions 253 of the spokes 250. For convenience, Fig. 6 shows the upper tip plate 330 separated from the upper rectangular plate 350.

[0062] That is, upper rectangular plate 350 protrudes in the circumferential direction by a predetermined distance (0.2 mm) from side surfaces 253 c on both sides of spoke 250. However, this is not limited to this, and the amount of protrusion of upper rectangular plate 350 from side surfaces 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 surfaces 253 c of spoke 250 by a predetermined gap and is kept out of contact with the side surfaces 253 c of spoke 250.

[0063] 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.

[0064] The plurality of recesses 350r provided in the upper rectangular plate 350 have a width (circumferential width) and depth (radial width) that can accommodate a portion of the conductive wire 401 of the coil 400. However, the recesses 350r may have a width and depth that can accommodate the entire conductive wire 401.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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 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.

[0069] <Upper tip plate> 4 and 5, the upper tip plate 330 is fixed with an adhesive or the like while in contact with the upper end surface 230a of the magnetic pole portion 230 of the stator core 210. The upper tip plate 330 has a bottom surface that is the same size as the upper end surface 230a of the magnetic pole portion 230.

[0070] The upper tip plate 330 of the upper plate 310 has an end 331 extending circumferentially from the upper rectangular plate 350 and a protrusion (wall) 333 having a rectangular parallelepiped shape formed integrally on the end 331.

[0071] 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.

[0072] Here, end portion 331 has the same shape as upper end surface 230a of magnetic pole portion 230 in stator core 210, but is formed slightly larger than upper end surface 230a.

[0073] Therefore, when the end 331 of the upper tip plate 330 is fixed with adhesive or the like while in contact with the upper end surface 230a of the magnetic pole portion 230, the two inclined surfaces 331k will protrude slightly toward the ring 220 side of the stator core 210.

[0074] Therefore, when the conducting wire 401 of the coil 400 is wound around the spokes 250 of the stator core 210, the two side portions 331k at the end portion 331 of the upper tip plate 330 separate the conducting wire 401 of the coil 400 and the inner surface 230i (FIGS. 2 and 3) of the magnetic pole portion 230 by a predetermined distance, preventing them from contacting each other. However, the curved surface 331g of the end portion 331 and the outer circumferential surface 230g (FIG. 3) of the magnetic pole portion 230 are flush with each other.

[0075] Protrusion (wall) 333 of upper tip plate 330 is a part formed integrally on end 331 and has a rectangular parallelepiped shape. Protrusion 333 can prevent wire 401 of coil 400 wound around spokes 250 of stator core 210 from becoming unwound.

[0076] In the above configuration, in motor 100 of the first embodiment, as shown in FIG. 6, side surface 253c is exposed to spokes 250 of stator core 210, but upper end surfaces 251a (FIG. 2) of spokes 250 are covered by upper rectangular plate 350 of upper plate 310 in insulator 300, and lower end surfaces 252b (FIG. 2) of spokes 250 are covered by lower rectangular plate 370 of lower plate 360.

[0077] 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 spokes 250 of the stator core 210, and is formed to a size that extends beyond the side surfaces 253c on both sides of the spokes 250.

[0078] 7, when the conducting wire 401 of the coil 400 is wound via 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 of the stator core 210. Thus, the motor 100 can prevent the conducting wire 401 of the coil 400 from coming into contact with the side surface 250c of the spoke 250.

[0079] Furthermore, in motor 100, side surfaces 253c of spokes 250 are not covered by insulator 300, and conductive wire 401 of coil 400 can be wound while being housed in recesses 350r of upper rectangular plate 350 and recesses 370r of lower rectangular plate 370. This allows motor 100 to increase the number of turns of conductive wire 401 of coil 400 wound around spokes 250 or the space (area) occupied by the coil formed by conductive wire 401 compared to conventional methods.

[0080] Thus, compared to conventional cases where insulators are attached around the entire circumference of the spokes, motor 100 can increase the number of turns of wire 401 of coil 400 using insulator 300, or increase the space (area) occupied by the coil, thereby improving motor output.

[0081] In motor 100, conductor 401 of coil 400 is wound while being accommodated in recess 350r of upper rectangular plate 350 and recess 370r of lower rectangular plate 370. Therefore, in motor 100, conductor 401 approaches side surface 253c of spoke 250, but contact between conductor 401 and side surface 253c of spoke 250 can be avoided.

[0082] Furthermore, 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, the conductor 401 can be wound efficiently while preventing the attachment position of the conductor 401 of the coil 400 relative to the spoke 250 from shifting radially, thereby contributing to improving motor output.

[0083] The upper rectangular plate 350 of the upper plate 310 is a flat plate with a flat upper end surface, and the side surface 350c on which the recess 350r and the flat portion 350p are formed forms a substantially right-angled corner with the upper end surface. However, in reality, the conducting wire 401 of the coil 400 is not bent at 90 degrees along the corner, but is wound in a curved state relative to the corner.

[0084] Therefore, a gap S (Figure 7) is reliably formed between the conductive wire 401 of the coil 400 and the side surface 253c of the spoke 250, thereby preventing a short circuit between the conductive wire 401 and the side surface 253c of the spoke 250.

[0085] Furthermore, the flat upper rectangular plate 350 is preferably as thin as possible to maximize the space occupied by the coil 400 formed later, but has sufficient bending rigidity to prevent warping of the upper end surfaces 251a of the spokes 250.

[0086] 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 a reduction in the number of turns of the conductor 401 of the coil 400 and a reduction in the space occupied by the subsequently formed coil 400, thereby improving motor output.

[0087] <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 differences.

[0088] Fig. 8 is a partially enlarged perspective view showing the configuration of an insulator 300A according to a second embodiment, which is an example of the present invention. Fig. 9 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 around the insulator 300A according to the second embodiment, which is an example of the present invention.

[0089] As shown in FIG. 8, in which parts corresponding to those in FIG. 6 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.

[0090] 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.

[0091] Upper plate 310A has the same basic structure as 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 both side surfaces 350c of upper rectangular plate 350A. These recesses 350r and flat portions 350p are the same as those in the first embodiment.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] The widths of recessed portions 350r, 351r, and flat portions 350p, 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, 351r, and flat portions 350p, 351p may be the same as the dimensions (diameter) of conducting wire 401 of coil 400.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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. 9, 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 around the motor 500 so as to overlap with the flat portion 350p of the side surface 350c.

[0100] 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.

[0101] 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.

[0102] <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.

[0103] Fig. 10 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. 11 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.

[0104] As shown in FIGS. 10 and 11, in which parts corresponding to those in FIG. 6 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.

[0105] 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.

[0106] 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.

[0107] 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 350 has two curved surfaces 351Bs formed by curved surfaces extending in an arc shape so as to be convex further upward from end portions 351g on the upper side (in the direction of arrow a) of two side end surfaces 351v extending along the rotation axis X direction, and side surfaces 351Bf connecting the two curved surfaces 351Bs in the circumferential direction.

[0108] 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. Side surface 353Bf 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.

[0109] Upper rectangular plate 350B has two curved surfaces 351Bs smoothly and integrally connected to side surface 351Bf, forming an outwardly convex curved surface as a whole. Here, the ratio of left curved surface 351Bs to the left half of side surface 351Bf is 4:1, and the ratio of right curved surface 351Bs to the right half of side surface 351Bf is 4:1.

[0110] That is, overall, the ratio of the two curved surfaces 351Bs to the one side surface 351Bf is 4:1, and the circumferential length of the two curved surfaces 351Bs is longer than the circumferential length of the side surface 351Bf.

[0111] As a result, the conductor 401 of the coil 400 wound around the upper rectangular plate 350B is smoothly wound at a gentle angle by the curved surfaces 351Bs formed by the left and right curved surfaces that occupy a larger portion than the side surfaces 351Bf, thereby preventing the conductor 401 from becoming unwound.

[0112] Upper rectangular plate 350B has a semicircular cross section and is made up of bottom surface 351Bb, side end surface 351v, side surface 351Bf, and curved surface 351Bs. Side surface 351Bf of upper rectangular plate 350B and the upper end surface of upper annular plate 320 form the same plane (FIG. 10).

[0113] Furthermore, as shown in FIG. 11, the height (thickness) h1 between the side 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.

[0114] Therefore, the conducting wire 401 of the coil 400 is bent at a gentle angle by the curved surface 351Bs 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.

[0115] 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.

[0116] 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.

[0117] In addition, in motor 600, conductor 401 is wound as close as possible to the side 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.

[0118] 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.

[0119] <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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] Furthermore, in the third embodiment of the present invention, the upper rectangular plate 350B has been described as having a curved surface with a semi-cylindrical cross section formed as a whole by the curved surfaces 351Bs and the side surfaces 351Bf connecting the curved surfaces 351Bs. However, the present invention is not limited to this, and the curved surface may be formed by connecting only the two curved surfaces 351Bs, 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.

[0124] Furthermore, in the first to third embodiments of the present invention, the case has been described in which the end 331 of the upper tip plate 330 has a curved surface 331g and two inclined surfaces 331k that are inclined obliquely from both side ends of the curved surface 331g toward the inner periphery (in the direction of arrow d) so as to approach the upper rectangular plate 350.

[0125] However, the first to third embodiments are not limited to this, and instead of the inclined surface 331k, an inner side surface 331m having the same curvature as the curved surface 331g and extending in the circumferential direction parallel to the curved surface 331g may be provided, as shown in Fig. 12. Alternatively, instead of the inclined surface 331k, a linear inner side surface 331n extending in the circumferential direction perpendicular to the side surface 253c of the spoke 250 may be provided, as shown in Fig. 13.

[0126] 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]

[0127] 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, 220... ring, 220a... upper end surface, 220b... lower end surface, 220g... outer circumferential surface, 230... magnetic pole portion, 230a... upper end surface, 230b... lower end surface, 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... insulator, 310, 310A, 310B...upper plate, 360, 360A, 360B...lower plate, 400...coil, 401...conductor, 320...upper annular plate, 330...upper tip plate, 331...end, 333...protrusion (wall), 331g...curved surface, 331k...inclined surface, 331m, 331n...inner surface, 350, 350A, 350B...upper rectangular plate, 350c...side surface, 350r, 3 51r...recess, 350p, 351p...flat portion (convex portion), 350At...upper end surface, 370, 370A, 370B...lower rectangular plate, 370c...side surface, 370r...recess, 370p...flat portion (convex portion), 351Bs...curved surface, 351Bf...side 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 spoke has a first end provided on one side in the rotation axis direction, a second end provided on the other side, and a side portion located between the first end and the second end, the insulator includes a first plate covering first ends of the spokes, a second plate covering second ends of the spokes, and an annular plate covering the ring; a width of the first plate and a width of the second plate in a circumferential direction are greater than a width of the spokes; The conductive wire forming the coil is wound around the spokes, The sides of the spokes face the conductors, a plurality of recesses or protrusions extending in the rotation axis direction are formed on a side surface of the first plate; Stator.

2. the annular plate includes a first annular plate disposed on the first plate side and a second annular plate disposed on the second plate side, the first plate and the first annular plate are continuous in the radial direction, The second plate and the second annular plate are continuous in the radial direction. The stator according to claim 1 .

3. a plurality of recesses or protrusions extending in a circumferential direction are formed on one end surface of the first plate; 3. A stator according to claim 1 or 2.

4. The end surface of the first plate is a curved surface. The stator according to claim 3 .

5. The first plate has a flat plate shape. A stator according to any one of claims 1 to 3.

6. The first plate has bending rigidity. A stator according to any one of claims 1 to 5.

7. 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 provided on one side in the rotation axis direction, a second end provided on the other side, 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, a second plate covering the second ends of the spokes, and an annular plate covering the ring; a width of the first plate and a width of the second plate in a circumferential direction are greater than a width of the spokes; The conductive wire forming the coil is wound around the spokes, The sides of the spokes face the conductors, a plurality of recesses or protrusions extending in the rotation axis direction are formed on a side surface of the first plate; Motor.

8. the annular plate includes a first annular plate disposed on the first plate side and a second annular plate disposed on the second plate side, the first plate and the first annular plate are continuous in the radial direction, The second plate and the second annular plate are continuous in the radial direction. The motor according to claim 7.

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