Stator and motor

Abstract

To prevent loosening when winding a conductor wire of a coil around an insulator.SOLUTION: Disclosed is a stator 200 which comprises: a magnetic material 210; an insulator 300 covering the magnetic material; 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 X direction; 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 of the spoke; and a second plate 360 covering the second end part. In the 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 forming the coil is wound around the spoke. The lateral part of the spoke faces the conductor wire. An upper end surface of the first plate is a curved surface.SELECTED DRAWING: Figure 8

Description

[Technical Field]

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

[0002] Conventionally, in the stator that constitutes a motor, a coil is wound around magnetic pole portions that are intermittently arranged at a predetermined pitch via an insulator, but when the coil generates heat due to the drive current, it is required to dissipate the heat outside the motor.

[0003] For this reason, a motor has been proposed in which the upper and lower parts of the magnetic pole part are covered with upper and lower corner covers, and a resin part is interposed between the magnetic pole part and the upper and lower corner covers, thereby ensuring a heat transfer path from the coil conductor to the magnetic pole part and efficiently dissipating heat from the motor (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-66314 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the motor of Patent Document 1, although heat can be efficiently dissipated through the resin between the insulators (upper corner covers and lower corner covers) that cover the magnetic pole parts and the magnetic pole parts, there is a risk of the coil (conductor) becoming miswound around the insulator or becoming distorted, such as swelling. Therefore, an object of the present invention is to provide a stator that can prevent the occurrence of winding collapse, and a motor using the stator. [Means for solving the problem]

[0006] The present invention provides a magnetic body comprising a magnetic pole portion, 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 comprise a first end portion on one side in the direction of the rotation axis, a second end portion on the other side, and a side portion between the first end and the second end, the insulator comprises a first plate covering the first ends of the spokes and a second plate covering the second ends, wherein the width of the first plate and the width of the second plate are greater than the width of the spokes in the circumferential direction, a conductive wire forming the coil is wound around the spokes, the side portions of the spokes face the conductive wire, and the upper end surface of the first plate is a curved surface. [Brief explanation of the drawings]

[0007] [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 cross-sectional view showing the shape of an upper plate of an insulator according to a first embodiment of the present invention. [Figure 8] 1 is a partially enlarged perspective view showing a configuration of an upper rectangular plate in an upper plate of an insulator according to a first embodiment which is an example of the present invention. FIG. [Figure 9] FIG. 1 is a partially enlarged perspective view showing a state in which a gap is formed between a spoke and a conductor when the coil conductor is wound around the spoke of a stator core via an upper rectangular plate according to a first embodiment of the present invention. [Figure 10] FIG. 10 is a partially enlarged perspective view showing the configuration of an upper rectangular plate of an insulator according to a second embodiment which is one example of the present invention. [Figure 11] FIG. 10 is a partially enlarged perspective view showing a state in which a gap is formed between the spoke and the conductor when the coil conductor is wound around the spoke of the stator core via an upper rectangular plate according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0008] <Embodiment> Hereinafter, a first embodiment and a second embodiment, which are examples of the present invention, will be described with reference to the drawings.

[0009] 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.

[0010] 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.

[0011] Fig. 7 is a partially enlarged cross-sectional view showing the shape of upper plate 310 of insulator 300 according to the first embodiment, which is an example of the present invention. Fig. 8 is a partially enlarged perspective view showing the configuration of upper rectangular plate 350 of upper plate 310 of insulator 300 according to the first embodiment, which is an example of the present invention. Fig. 9 is a partially enlarged perspective view showing a state in which gap S is formed between spoke 250 and conductive wire 401 when conductive wire 401 of coil 400 is wound around spoke 250 of stator core 210 via insulator 300 according to the first embodiment, which is an example of the present invention.

[0012] 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.

[0013] 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.

[0014] The motor 100 includes a base 110 , a shaft 130 , a bearing device 150 , a rotor 170 , and a stator 200 .

[0015] <Bass> The base 110 of the motor 100 comprises a substantially disk-shaped plate 111, a cylindrical outer peripheral portion (hereinafter referred to as the outer peripheral wall) 112 extending a predetermined length upward (in the direction of arrow a) from the radially outer end (in the direction of arrow c) of the plate 111, and a cylindrical inner peripheral portion (hereinafter referred to as the inner peripheral wall) 113 protruding a predetermined length upward (in the direction of arrow a) from the radially inner end (in the direction of arrow d) on the other radial side of the plate 111.

[0016] 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.

[0017] 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.

[0018] <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.

[0019] <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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] <Rotor> Rotor 170 is fixed to the upper end (in the direction of arrow a) of shaft 130. Rotor 170 has rotor yoke 171 and magnet 175. Rotor yoke 171 has outer circumferential portion 172 provided on the outer circumferential side, disk portion 173 provided in the center, and inner circumferential portion 174 of rotor yoke 171 provided on the inner circumferential side.

[0024] 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 integrally 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.

[0025] 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.

[0026] 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 in the direction of rotation axis X 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.

[0027] 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.

[0028] <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.

[0029] 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.

[0030] 2 and 3, in stator 200, upper plate 310 of insulator 300 is attached to the upper side of stator core 210, and lower plate 360 ​​of insulator 300 is attached to the lower side of stator core 210. Note that coil 400 is not shown in FIGS. 2 and 3 for ease of viewing.

[0031] <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.

[0032] 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.

[0033] The ring 220, magnetic pole portion 230, and spokes 250 that make up the stator core 210 are integrally formed. However, for ease of explanation, the stator core 210 will be explained separately as the ring 220, magnetic pole portion 230, and spokes 250.

[0034] <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).

[0035] 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.

[0036] 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 (in the direction of arrow c).

[0037] <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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] The outer surface 230g of the magnetic pole portion 230 is a curved surface that curves along the inner surface of the magnet 175 that is fixed integrally with the rotor yoke 171, and a predetermined gap (magnetic gap) is formed between the outer surface 230g and the inner surface of the magnet 175 in the radial direction.

[0042] The inner surfaces 230i of the magnetic pole portions are inclined from both side ends of the outer peripheral surface 230g toward the spokes 250 and toward the outer peripheral surface 220g of the ring 220, and extend to the side surfaces 253c of the side portions 253 of the spokes 250.

[0043] <Spokes> As shown in FIG. 4, the spokes 250 extend radially from the outer peripheral surface 220g of the ring 220 toward the magnetic pole portion 230 on the outer periphery (direction of arrow c), and connect the ring 220 and the magnetic pole portion 230.

[0044] 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.

[0045] 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 250c of the side portion 253 of the spoke 250 face back to back.

[0046] The upper end surface 251a of the first end 251 of the spoke 250 is part of the upper surface of the electromagnetic steel plate arranged at the top of the stacked electromagnetic steel plates, and is a flat surface along a horizontal direction perpendicular to the direction of the rotation axis X.

[0047] 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.

[0048] 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.

[0049] The side surface 253c of the side portion 253 of the spoke 250 is an aggregate of the respective side surfaces of a plurality of stacked electromagnetic steel plates, and as a whole forms a surface extending in the direction of the rotation axis X, and the two side surfaces 253c of the side portion 253 are parallel to each other.

[0050] The side surface 253c of the side portion 253 of this spoke 250 is the portion exposed to the upper plate 310 and the lower plate 360 ​​of the insulator 300 described later (Figure 2), but the conductor wire 401 of the coil 400 is wound around the insulator 300 so as to be separated from the side surface 253c in the circumferential direction by a predetermined distance S described later and not in contact with the side surface 253c.

[0051] Since the conductive wire 401 of the coil 400 is thus configured to be spaced a predetermined distance from the side surface 253c of the spoke 250, the side surface 253c of the spoke 250 does not have to be a completely flat surface.

[0052] <Coil> Coil 400 (FIGS. 1 and 9) 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 .

[0053] 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.

[0054] The conductor 401 of the coil 400 faces the side surface 253c of the spoke 250 via the upper plate 310 and the lower plate 360 ​​of the insulator 300, but is not in contact with the side surface 253c.

[0055] <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.

[0056] 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).

[0057] 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.

[0058] <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 first end 251 of the spoke 250 from above (in the direction of arrow a), and a portion (hereinafter referred to as the "upper tip plate") 330 that covers the upper end surface 230a (Figure 4) of the magnetic pole portion 230 from above (in the direction of arrow a).

[0059] Lower plate 360 ​​(Figure 3) also has a shape similar to that of upper plate 310, and includes an annular portion 380 (hereinafter referred to as the lower annular plate) that covers lower end surface 220b of ring 220 in stator core 210 from below (in the direction of arrow b), a portion 370 (hereinafter referred to as the lower rectangular plate) that covers lower end surface 252b (Figure 4) of second end 252 of spoke 250 from below (in the direction of arrow b), and a portion 390 (hereinafter referred to as the lower tip plate) that covers lower end surface 230b (Figure 4) of magnetic pole portion 230 from below (in the direction of arrow b).

[0060] 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 as separate members and attached separately to stator core 210. 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 as separate members and attached separately to stator core 210.

[0061] <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.

[0062] 2, the dimension (inner diameter) of the inner circumferential portion of upper annular plate 320 is larger than the dimension (inner diameter) of the inner circumferential portion of ring 220 of stator core 210. That is, in this case, upper annular plate 320 exposes the inner circumferential portion of upper end surface 220a of ring 220. 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.

[0063] 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).

[0064] 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 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 circumferential surface 220g of the ring 220 in the radial direction, and physical contact with the outer circumferential surface 220g of the ring 220 is prevented in advance.

[0065] <Upper tip plate> Upper end plate 330 of upper plate 310 is fixed in contact with upper end surface 230a of magnetic pole portion 230 of stator core 210. Upper end plate 330 has a bottom surface that is the same size as upper end surface 230a of magnetic pole portion 230.

[0066] The upper tip plate 330 has an end 331 extending circumferentially from the upper rectangular plate 350, and a protrusion (wall) 333 having an approximately rectangular parallelepiped shape formed integrally on the end 331.

[0067] 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 that are inclined diagonally from both side 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.

[0068] 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 to be (slightly) larger than upper end surface 230a by a predetermined size.

[0069] 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 side portions protrude slightly toward the ring 220 of the stator core 210.

[0070] Therefore, when the conductive wire 401 of the coil 400 is wound around the spokes 250 of the stator core 210, the presence of the two side portions at the end 331 of the upper tip plate 330 makes it possible to prevent contact between the conductive wire 401 of the coil 400 and the inner surface 230i (FIGS. 2 and 3) of the magnetic pole portion 230. However, the curved surface 331g of the end 331 and the outer circumferential surface 230g (FIG. 3) of the magnetic pole portion 230 are flush with each other.

[0071] The protrusion (wall) 333 of the upper tip plate 330 is a protruding portion of approximately rectangular parallelepiped shape formed integrally on the end portion 331, and prevents the wire 401 of the coil 400 wound around the spokes 250 of the stator core 210 from becoming unwound.

[0072] <Upper rectangular plate> As shown in FIG. 3, upper rectangular plate 350 of upper plate 310 is a portion that is attached by adhesive or the like in contact with upper end surfaces 251a (FIG. 4) of spokes 250 of stator core 210.

[0073] The upper rectangular plate 350 extends radially outward (in the direction of arrow c) from the upper annular plate 320. The radial length of the upper rectangular plate 350 is the same as the radial length of the spokes 250.

[0074] Furthermore, upper rectangular plate 350 has a predetermined bending rigidity. By providing upper rectangular plate 350 with the predetermined bending rigidity, upper rectangular plate 350 can be prevented from warping upward (in the direction of arrow a) after being attached to upper end surfaces 251 a of spokes 250, and upper rectangular plate 350 is in close contact with the entire upper end surfaces 251 a of spokes 250.

[0075] As shown in FIG. 7, the upper end surface of the upper rectangular plate 350 has two curved surfaces 351s each consisting of a curved surface extending in an arc shape so as to be convex further upward from an end 351g on the upper side (in the direction of arrow a) of two side end surfaces 351v extending along the direction of the rotation axis X, and a flat surface 351f connecting the two curved surfaces 351s in the circumferential direction.

[0076] Curved surface 351s of upper rectangular plate 350 is curved at an angle such that conductor wire 401 of coil 400 can be easily aligned along curved surface 351s when winding conductor wire 401. Flat surface 351f of upper rectangular plate 350 is a flat surface extending along a horizontal direction (circumferential direction) intersecting (orthogonal to) the direction of rotation axis X.

[0077] Upper rectangular plate 350 has two curved surfaces 351s smoothly and integrally connected to flat surface 351f, forming an outwardly convex curved surface as a whole. Here, the ratio of left curved surface 351s to the left half of flat surface 351f is 4:1, and the ratio of right curved surface 351s to the right half of flat surface 351f is 4:1.

[0078] That is, overall, the ratio of the two curved surfaces 351s to the one flat surface 351f is 4:1, and the circumferential length of the two curved surfaces 351s is longer than the circumferential length of the flat surface 351f.

[0079] As a result, the conductor 401 of the coil 400 wound around the upper rectangular plate 350 is wound smoothly at a gentle angle due to the presence of the curved surface 351s consisting of left and right curved surfaces that occupy a larger portion than the flat surface 351f, thereby preventing the conductor 401 from becoming unwound.

[0080] Upper rectangular plate 350 has a semicircular cross section consisting of bottom surface 351b, side end surface 351v, flat surface 351f, and curved surface 351s. Flat surface 351f of upper rectangular plate 350 and the upper end surface of upper annular plate 320 form the same plane (FIG. 2).

[0081] The height (thickness) h1 between the flat surface 351f and the end 351g of the side end surface 351v of the upper rectangular plate 350 is greater than the height (thickness) h2 between the end 351g of the side end surface 351v of the upper rectangular plate 350 and the bottom surface 351b.

[0082] Therefore, the conducting wire 401 of the coil 400 is bent at a gentle angle by the curved surface 351s 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.

[0083] This provides a predetermined gap between the side surface 235c of the side portion 235 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.

[0084] In this way, in motor 100, conductor 401 of coil 400 can be arranged along curved surface 351s and side end surface 351v of upper rectangular plate 350, so that conductor 401 of coil 400 is not subjected to a load that would cause it to bend at a steep angle.

[0085] Furthermore, in motor 100, 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.

[0086] 8, the width w1 of the upper rectangular plate 350 in the circumferential direction is larger than the width w2 (the distance between the two side surfaces 253c of the side portions 253) 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 larger than the width w2 of the side portions 253 of the spokes 250 by about 0.2 mm.

[0087] 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.

[0088] Additionally, a plurality of recesses (or protrusions) 350r are provided on the side surface of the upper rectangular plate 350. The recesses 350r are aligned in the radial direction. Each recess 350r has a width sufficient to accommodate the conductive wire 401 of the coil 400 in the radial direction.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] On the two side surfaces 350c on both sides 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.

[0093] 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).

[0094] 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.

[0095] At this time, 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 of the side portions 253 of the spokes 250. Therefore, the upper rectangular plate 350 and the lower rectangular plate 370 each protrude from the side surfaces 253c of the side portions 253 of the spokes 250.

[0096] As a result, in the motor 100, when the conductor 401 of the coil 400 is wound through the upper rectangular plate 350 of the upper plate 310 and the lower rectangular plate 370 of the lower plate 360, as shown in Figure 9, a gap S is formed between the conductor 401 and the side surface 253c of the side portion 253 of the spoke 250.

[0097] 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.

[0098] Furthermore, in motor 100, upper rectangular plate 350 has two curved surfaces 351s and flat surface 351f that form a semicircular cross section, so that conducting wire 401 of coil 400 is wound in a bent state along curved surface 351s and flat surface 351f without applying excessive load. This prevents irregular winding or bulging of conducting wire 401 of coil 400, allowing conducting wire 401 to be wound efficiently.

[0099] Furthermore, in motor 100, the 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, so that the position of the wound conductor 401 is shifted radially, preventing the coil from becoming unwound.

[0100] Furthermore, the flat upper rectangular plate 350 is preferably as thin as possible to maximize the space occupied by the coil 400 that will be formed later, but has sufficient bending rigidity to prevent the upper rectangular plate 350 from warping.

[0101] As a result, in the motor 100, the upper rectangular plate 350 is maintained in close contact with the upper end surfaces 251a of the spokes 250, preventing the wound coil 400 from becoming unwound or the space occupied by the coil 400 from decreasing, thereby improving motor output.

[0102] <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.

[0103] Fig. 10 is a partially enlarged perspective view showing the configuration of upper rectangular plate 350A of insulator 300A according to a second embodiment, which is an example of the present invention. Fig. 11 is a partially enlarged perspective view showing a state in which gap S is formed between spoke 250 and conductive wire 401 when conductive wire 401 of coil 400 is wound around spoke 250 of stator core 210 via upper rectangular plate 350A according to the second embodiment, which is an example of the present invention.

[0104] As shown in FIG. 10, in which parts corresponding to those in FIG. 8 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.

[0105] 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.

[0106] 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.

[0107] 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 and a plurality of flat portions 351p formed with the same curvature as the curved surface 351s and flat surface 351f extending in the circumferential direction. These recesses 351r and flat portions 351p are alternately provided in the radial direction on the upper end surface 350At.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] The lower rectangular plate 370A of the lower plate 360A also has a recess and a flat portion similar to the recess 351r and flat portion 351p formed on the top end surface 350At of the upper rectangular plate 350A.

[0115] Next, a description will be given of a case where the conducting wire 401 of the coil 400 is wound around the spokes 250 in the motor 500 according to the second embodiment. As shown in Fig. 11, in this motor 500, approximately half the diameter of the conducting wire 401 is accommodated in a plurality of recesses 351r formed in the top end surface 350At of the upper rectangular plate 350A, and the conducting wire 401 is wound so as to overlap with the flat portion 350p of the side surface 350c.

[0116] 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.

[0117] 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.

[0118] <Other embodiments> The motors 100 and 500 of the preferred first and second embodiments of the present invention have been described above as being outer rotor motors, but the motors of the present invention are not limited to the configurations of the first and second embodiments, and may also be applied to inner rotor motors.

[0119] Furthermore, in the first and second 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.

[0120] 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.

[0121] 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.

[0122] Furthermore, in the first embodiment of the present invention, the case has been described in which upper rectangular plate 350 is configured to form a curved surface with a semicircular cross section that is curved as a whole by curved surface 351s and flat surface 351f connecting both curved surfaces 351s. However, the present invention is not limited to this, and the curved surface may be formed by connecting only two curved surfaces 351s to each other, or the end portions 351g of two side end surfaces 351v may be connected in a semicircular shape to form a curved surface as a whole.

[0123] 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]

[0124] 100, 500... 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 of rotor yoke 171, 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, 230i... inner surface, 230g... outer circumferential surface, 250... spokes, 251... first end portion, 251a... upper end surface, 252... second end portion, 252b... lower end surface, 253... side portion, 25 3c...side, 300, 300A...insulator, 310, 310A...upper plate, 360, 360A...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, 350, 350A...upper rectangular plate, 350c... Side surface, 350r, 351r...recessed portion, 350p, 351p...flat portion (convex portion), 350At...upper end surface, 370, 370A...lower rectangular plate, 370c...side surface, 370r...recessed portion, 370p...flat portion (convex portion), 351s...curved surface, 351f...side surface, 351b...bottom surface, 351v...side end surface, sp...coil spring, h1, h2...height (thickness), w1, w2...width.

Claims

1. The magnetic coil includes a magnetic body, an insulator that covers the magnetic body, and a coil, the magnetic body includes a magnetic pole portion, a ring, and spokes connecting the magnetic pole portion and the ring, The spoke has a first end 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 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 side of the spoke faces the conductor; The upper end surface of the first plate is a curved surface. Stator.

2. The curved surface is formed by a curved surface and a side surface connected to the curved surface. The stator according to claim 1 .

3. In the circumferential direction, the length of the curved surface is greater than the length of the side surface. The stator according to claim 2 .

4. an upper end surface of the first plate having the curved surface and a side end surface connected to the curved surface and extending in the rotation axis direction; The stator according to claim 1 .

5. a plurality of recesses or protrusions extending in the rotation axis direction are formed on a side surface of the first plate; The stator according to claim 1 .

6. In the rotation axis direction, a plurality of recesses or a plurality of protrusions extending in a circumferential direction are formed on an end surface of the first plate provided on the one side.

3. A stator according to claim 1 or 2.

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

8. The first plate has bending rigidity. A stator according to any one of claims 1 to 4.

9. 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 and a second plate covering the second ends of the spokes; a width of the first plate and the second plate in a circumferential direction is greater than a width of the spoke; The conductive wire forming the coil is wound around the spokes, The sides of the spokes face the conductors, The upper end surface of the first plate is a curved surface. Motor.

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