Motor

Abstract

The present disclosure, for example, improves the coaxiality of a motor. A motor (100) is provided, for example, with: a shaft (S); magnets (112, 212); a coil (120); a first bearing (113a) disposed on one end (S1) side of the shaft (S) in the axial direction; a second bearing (113b) disposed on the other end (S2) side of the shaft (S) in the axial direction; a cover (114, 414) fixed to the second bearing (113b) and disposed on the inside of the coil (120) in the radial direction; a holder (115, 415) fixed to the first bearing (113a); and an elastic member (116, 416) held by the holder (115, 415), the elastic member (116, 416) being disposed between the cover (114, 414) and the holder (115, 415) in the longitudinal direction of the shaft (S).

Description

Technical Field

[0001] The present invention relates to a motor. Background Art

[0002] Conventionally, there is known a motor having a bearing device in which bearings are arranged at both ends of a shaft and the two bearings are preloaded in a direction away from each other in the axial direction. For example, Patent Document 1 discloses a rolling bearing device having a preload unit having an elastic member. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Utility Model Application Laid-Open No. 4-82425 Summary of the invention Problems to be solved by the invention

[0004] In such a motor, it is required to improve the coaxiality between the rotor and the stator. The present invention takes improving the coaxiality of a motor as an example of a subject. Solutions for solving problems

[0005] The motor of the present invention comprises: a shaft; a magnet; a coil; a first bearing, which is axially arranged on the end side of one side of the shaft; a second bearing, which is axially arranged on the end side of the other side of the shaft; a cover, which is fixed to the second bearing and radially arranged on the inner side of the coil; a retaining frame, which is fixed to the first bearing; and an elastic member, which is retained by the retaining frame, and the elastic member is arranged between the cover and the retaining frame in the long dimension direction of the shaft.

[0006] Another motor of the present invention has an annular yoke having two end faces in the axial direction. In addition, the motor also has a stator, which has: a plurality of magnetic poles; a plurality of spokes connected to the plurality of magnetic poles and the inner circumference of the annular yoke; and a plurality of coils wound around the plurality of spokes. In this motor, the plurality of spokes can be respectively loaded and unloaded relative to the annular yoke, and the annular yoke and the plurality of spokes are respectively formed by a plurality of magnetic bodies stacked in the axial direction, and the plurality of magnetic bodies forming the spokes are forced from the end face side of one of the two end faces of the annular yoke toward the end face side of the other end face.

[0007] Another motor of the present invention may include at least one of the following structures.

[0008] The plurality of magnetic bodies forming the spokes may also be urged in the radial direction. In addition, the annular yoke may include a plurality of openings arranged in the circumferential direction, the plurality of openings respectively including an inner surface located on the end face side of the one side of the annular yoke and an inner surface located on the end face side of the other side of the annular yoke, the plurality of spokes extend in the radial direction and pass through the plurality of openings, and the plurality of magnetic bodies forming the spokes are urged from the inner surface located on the end face side of the one side of the annular yoke toward the inner surface located on the end face side of the other side of the annular yoke. In addition, in the case where the motor includes the plurality of openings, the number of the plurality of magnetic bodies forming the spokes is less than the number of the plurality of magnetic bodies forming the plurality of openings among the plurality of magnetic bodies forming the annular yoke. In addition, the plurality of spokes may include a plurality of hole portions extending in the axial direction, and the components inserted into the plurality of hole portions may urge the plurality of magnetic bodies forming the spokes. Alternatively, when the motor has the above-mentioned multiple hole portions, the multiple hole portions are respectively adjacent to the annular yoke in the radial direction. Alternatively, when the multiple hole portions are respectively adjacent to the annular yoke in the radial direction, the components are respectively in contact with the side surfaces of the annular yoke. Alternatively, when the components are respectively in contact with the side surfaces of the annular yoke, the components respectively have side surfaces inclined relative to the side surfaces of the annular yoke. Furthermore, the axial thickness of each of the multiple magnetic bodies forming the spokes may be the same as the axial thickness of each of the multiple magnetic bodies forming the annular yoke. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a cross-sectional view of a motor according to a first embodiment as an example of the present invention. Figure 2 This is a cross-sectional view showing only a bearing device in a motor according to a first embodiment as an example of the present invention. Figure 3 This is a cross-sectional view showing only a bearing device in a motor according to a second embodiment of the present invention. Figure 4 This is a cross-sectional view showing only a bearing device in a motor according to a third embodiment as an example of the present invention. Figure 5 This is a cross-sectional view showing only a bearing device in a motor according to a fourth embodiment as an example of the present invention. Figure 6 This is a cross-sectional view showing only a bearing device in a motor according to a fifth embodiment of the present invention. Figure 7 It is a perspective view showing a motor according to a sixth embodiment which is another example of the present invention. Figure 8 Observed from one side of the axis Figure 7 The motor is shown in a top view. Fig. 9 yes Figure 7 A radial cross-sectional view of the motor shown. Fig.10 yes Figure 7 A cross-sectional view of the motor shown in the axial direction. Fig.11 It means from Figure 8 The motor is shown in a top view with the bearing assembly removed. Fig.12 yes Fig.11 The cross-sectional view at line AA is shown. Fig. 12A It is a diagram schematically showing the side surface of each magnetic body. Fig.13 It means that Fig.11 A perspective view showing a state in which one of the plurality of stator components is removed from a yoke. Fig.14 Yes means Fig.11 A top view of a stator component among a plurality of stator components is shown passing through an opening of a yoke. Fig.15 Yes means Figure 7 A three-dimensional view of the pressing member shown. Fig.16 Yes means Fig.15 A side view of the pressing member is shown. Fig.17 Yes means Fig.15 The illustrated perspective view is a state where the pressing member starts to be inserted into the hole of the yoke. Fig.18 It is a perspective view showing a motor according to a seventh embodiment which is another example of the present invention. Fig.19 Yes means Fig.18 A three-dimensional view of the pressing member shown. Fig. 20 Yes means Fig.18 A bottom view of the pressing member is shown. DETAILED DESCRIPTION

[0010] In the description of the first to fifth embodiments of the present invention, for the sake of convenience, the direction of arrow a along the axis X in each figure (the direction from the second bearing 113b toward the first bearing 113a) is set as the lower side or one side. The direction of arrow b along the axis X (the direction from the first bearing 113a toward the second bearing 113b) is set as the upper side or the other side. Here, the arrow ab directions are referred to as the up-down directions or axial directions. However, the up-down directions are not necessarily consistent with the vertical direction. In addition, the arrow cd direction is referred to as the radial direction, the arrow c direction away from the axis X is referred to as the outer side, and the arrow d direction close to the axis X is referred to as the inner side.

[0011] [First embodiment] Hereinafter, a first embodiment as an example of the present invention will be described with reference to the drawings. Figure 1 1 is a cross-sectional view of the motor 100 according to the present embodiment, taken along a plane including the axis X. Figure 2 is Figure 1 Only the bearing device 110 is shown in the figure.

[0012] like Figure 1 As shown, the motor 100 has a bearing device 110, a coil 120, a magnetic body 130, a housing 140 and a cover 150. In this embodiment, the magnetic body 130 is composed of a plurality of magnetic bodies (electromagnetic steel sheets) stacked in the axial direction. The housing 140 is a cylindrical member with a bottom that is open on the other axial side (arrow b direction). The housing 140 has a cylinder (cylindrical part) 141, a bottom 142 and an annular protrusion 143. The cylinder 141 is a cylindrical part with the axis X as the central axis. The bottom 142 is an annular flat plate part extending from the end of the axial one side (arrow a direction) of the cylinder 141 to the radial inner side (arrow d direction). The protrusion 143 is a cylindrical part extending from the end of the radial inner side (arrow d direction) of the bottom 142 to the other axial side (arrow b direction). In the axial direction, the length of the cylinder 141 is longer than the length of the protrusion 143.

[0013] The cover 150 is a cover-shaped member that covers the opening on the other axial side (arrow b direction) of the cylindrical portion 141 of the housing 140, and has a flat plate portion 151, an outer peripheral portion (engaging portion) 152, and an inner peripheral portion (convex portion) 153. The flat plate portion 151 is an annular portion with the axis X as the central axis. The outer periphery and inner periphery of the flat plate portion 151 have the same or substantially the same radial size (outer diameter and inner diameter) as the housing 140. The engaging portion 152 is an annular portion that protrudes from the end of the radial outer side (arrow c direction) of the flat plate portion 151 slightly radially inward (arrow d direction) to one axial side (arrow a direction). The convex portion 153 is a cylindrical portion that protrudes from the end of the radial inner side (arrow d direction) of the flat plate portion 151 to one axial side (arrow a direction). In the axial direction, the length of the engaging portion 152 is substantially the same as the length of the convex portion 153.

[0014] The engaging portion 152 of the cover 150 engages with the end portion (outer peripheral end portion) on the other axial side (arrow b direction) of the cylindrical portion 141 of the housing 140. The radial size (outer diameter) of the engaging portion 152 of the cover 150 is the same or substantially the same as the radial size (inner diameter) of the cylindrical portion 141 of the housing 140, and the engaging portion 152 of the cover 150 is inserted into the radial inner side (arrow d direction) of the end portion on the other axial side (arrow b direction) of the cylindrical portion 141 of the housing 140. The engaging portion 152 of the cover 150 is fixed to the cylindrical portion 141 of the housing 140 by bonding or press-fitting.

[0015] The inner diameter of the protrusion 143 of the housing 140 is the same as the inner diameter of the convex portion 153 of the cover 150. In the radial direction, the outer surface of the cylindrical cover 114 of the bearing device 110, which will be described later, is fixed to the inner surface of the protrusion 143 of the housing 140 and the inner surface of the convex portion 153 of the cover 150 by adhesive or the like. The coil 120 and the magnetic body 130 are accommodated in the cylindrical space defined by the housing 140, the cover 150 and the cover 114 of the bearing device 110 and having the axis X as the center axis. Therefore, in the radial direction, the cover 114 of the bearing device 110 is arranged on the inner side of the coil 120 (in the direction of the arrow d).

[0016] The magnetic body 130 is formed by a laminated body in which a plurality of electromagnetic steel plates formed of a soft magnetic material are laminated in the axial direction. The magnetic body 130 is connected to the radial inner side (in the direction of arrow d) of the cylindrical portion 141 of the housing 140, and extends radially inward (in the direction of arrow d) to the vicinity of the cover 114 of the bearing device 110. In the motor 100 of the present embodiment, six magnetic bodies 130 are radially arranged at equal angles in the circumferential direction. However, the number of magnetic bodies 130 is not limited to six. The coil 120 is wound around each magnetic body 130 via an insulator not shown in the figure.

[0017] like Figure 2As shown, the bearing device 110 includes a shaft S, a magnet 112, a first bearing 113a, a second bearing 113b, a cover 114, a retainer 115, and an elastic member 116. In the radial direction, the shaft S, the magnet 112, the first bearing 113a, and the second bearing 113b are arranged on the inner side of the cover 114. That is, in the radial direction, the cover 114 has a sleeve shape covering the shaft S, the magnet 112, the first bearing 113a, and the second bearing 113b, and the cover 114 has an end 114a located on one side of the first bearing 113a and an end 114b located on the other side of the second bearing 113b. The cover 114 is formed of ceramic. However, the cover 114 may also be formed of other raw materials such as non-magnetic metals and resins.

[0018] The shaft S is a cylindrical or substantially cylindrical member extending in the axial direction. The shaft S has an end S1 located on one side of the first bearing 113a and an end S2 located on the other side of the second bearing 113b. In the axial direction, the first bearing 113a is arranged on the end S1 side of one side of the shaft S. In addition, in the axial direction, the second bearing 113b is arranged on the end S2 side of the other side of the shaft S.

[0019] The first bearing 113a is a ball bearing having an inner ring 113ai, an outer ring 113ao, and rolling elements. It should be noted that the first bearing 113a is not limited to this type of ball bearing, and may be, for example, a sleeve bearing, a ball bearing having a ball and an outer ring that fit into a recessed portion of the outer peripheral surface of the shaft, or other various bearings. The inner ring 113ai of the first bearing 113a is pressed into or bonded to the radially outer side (direction of arrow c) of the shaft S. Thus, the inner ring 113ai of the first bearing 113a is fixed to the shaft S.

[0020] The second bearing 113b has the same size and structure as the first bearing 113a. The second bearing 113b is a ball bearing having an inner ring 113bi, an outer ring 113bo and rolling elements. It should be noted that the second bearing 113b is not limited to this form of ball bearing, and may be, for example, a sleeve bearing, a ball bearing having balls and an outer ring that fit into a recessed portion of the outer peripheral surface of the shaft, or other various bearings. The inner ring 113bi of the second bearing 113b is pressed into or bonded to the radially outer side (in the direction of arrow c) of the shaft S. Thus, the inner ring 113bi of the second bearing 113b is fixed to the shaft S.

[0021] In the radial direction, the other end 114b of the cylindrical cover 114 is fixed to the outside (arrow c direction) of the outer ring 113bo of the second bearing 113b via the annular spacer 119. In the axial direction, the length of the spacer 119 is the same or substantially the same as the length of the second bearing 113b. In the radial direction, the inner diameter of the spacer 119 is the same or substantially the same as the outer diameter of the outer ring 113bo of the second bearing 113b, and the outer diameter of the spacer 119 is the same or substantially the same as the inner diameter of the cover 114. The radial outer side (arrow c direction) surface of the outer ring 113bo of the second bearing 113b and the radial inner side (arrow d direction) surface of the spacer 119 and the radial outer side (arrow c direction) surface of the spacer 119 and the radial inner side (arrow d direction) surface of the cover 114 are fixed by press fitting or bonding. The second bearing 113b supports the shaft S so that it can rotate relative to the cover 114.

[0022] In the radial direction, an end portion (the other end portion 115h) of the other axial side (the direction of arrow b) of the retainer 115 is fixed to the outside (the direction of arrow c) of the outer ring 113ao of the first bearing 113a. The radially outer side (the direction of arrow c) surface of the outer ring 113ao of the first bearing 113a and the radially inner side (the direction of arrow d) surface of the inner peripheral portion 115a of the retainer 115, which will be described later, are fixed by press fitting or bonding. The first bearing 113a supports the shaft S so that it can rotate relative to the retainer 115.

[0023] The retainer 115 has a three-dimensional shape obtained by rotating a substantially J-shaped cross section around the axis X. The retainer 115 is formed of a metal such as aluminum, copper, or iron. However, the retainer 115 may also be formed of other raw materials such as resin. The retainer 115 may also be formed of a raw material that is softer than the cover 114. The retainer 115 has an inner peripheral portion 115a, a connecting portion 115b, and an outer peripheral portion 115c. The connecting portion 115b forms an end portion 115g on one side of the retainer 115, and the retainer 115 has an end portion 115g on one side and an end portion 115h on the other side.

[0024] The inner circumference 115a is a cylindrical portion extending in the axial direction. In the radial direction, the thickness of the inner circumference 115a is the same as or substantially the same as the thickness of the spacer 119. In addition, in the radial direction, the inner diameter and outer diameter of the inner circumference 115a are the same as or substantially the same as the inner diameter and outer diameter of the spacer 119. In the axial direction, the length of the inner circumference 115a is longer than the length of the first bearing 113a.

[0025] The connecting portion 115b is an annular portion extending from the end of one axial side (arrow a direction) of the inner circumference 115a to the radially outer side (arrow c direction). The outer circumference 115c is a cylindrical portion extending from the end of the radially outer side (arrow c direction) of the connecting portion 115b to the axially other side (arrow b direction). In the axial direction, the length of the outer circumference 115c is shorter than the length of the inner circumference 115a.

[0026] In the retainer 115, the annular space surrounded by the inner circumference 115a, the connecting portion 115b and the outer circumference 115c is called the housing portion 115d. In the axial direction, the housing portion 115d has a depth corresponding to the length of the outer circumference 115c. The width of the housing portion 115d in the radial direction, that is, the distance between the inner circumference 115a and the outer circumference 115c is equal to or slightly larger than the thickness of the cover 114.

[0027] The housing 115d of the retainer 115 houses the elastic member 116. That is, the retainer 115 holds the elastic member 116. The end 114a of one side of the cover 114 is inserted into the housing 115d from the other axial side (arrow b direction) of the housing 115d. The contact portion between the cover 114 and the retainer 115 can slide in the axial direction. The elastic member 116 is arranged between the cover 114 and the retainer 115 in the axial direction (long dimension direction of the shaft S), that is, between the end 114a of one side of the cover 114 and the surface of the other axial side (arrow b direction) of the connecting portion 115b of the retainer 115 (that is, the bottom surface forming the housing 115d). The elastic member 116 contacts both the end 114a of one side of the cover 114 and the surface of the other axial side (arrow b direction) of the connecting portion 115b of the retainer 115, and is clamped by both.

[0028] In the present embodiment, the elastic member 116 is a substantially cylindrical spiral coil with the axis X as the central axis. However, the elastic member 116 may also be a member formed of various shapes formed by raw materials having rubber elasticity. As raw materials having rubber elasticity, for example, thermosetting elastomers such as natural rubber and synthetic rubber, thermoplastic elastomers such as styrene, olefin, vinyl chloride, acrylic, polyamide, polyester, and polyurethane may be cited. In addition, a plurality of elastic members 116 may also be arranged in the accommodating portion 115d in a circumferential direction.

[0029] In the axial direction, the elastic member 116 applies force to the cover 114 and the retaining frame 115. Specifically, in the axial direction, the elastic member 116 presses the cover 114 and the retaining frame 115 in a direction away from each other. That is, the elastic member 116 presses the cover 114 toward the axial upper side (the direction of the arrow b). In addition, the elastic member 116 presses the retaining frame 115 toward the axial lower side (the direction of the arrow a).

[0030] As described above, the other end 114b of the cylindrical cover 114 is fixed to the outside (arrow c direction) of the outer ring 113bo of the second bearing 113b in the radial direction via the annular spacer 119, and the retainer 115 is fixed to the outside (arrow c direction) of the outer ring 113ao of the first bearing 113a in the radial direction. Therefore, the outer ring 113ao of the first bearing 113a and the outer ring 113bo of the second bearing 113b are preloaded by the elastic member 116 so as to be separated from each other in the axial direction.

[0031] In the present embodiment, the magnet 112 is a cylindrical permanent magnet having four magnetic poles by alternately magnetizing different magnetic poles (S pole and N pole) in the circumferential direction. However, the number of magnetic poles of the magnet 112 is not limited to four, and may be other numbers. In the radial direction, the inner diameter of the magnet 112 is the same as or slightly larger than the outer diameter of the shaft S. The magnet 112 is fixed to the radial outer side (arrow c direction) of the shaft S by bonding or pressing. In the axial direction, the magnet 112 is arranged at a predetermined distance from the first bearing 113a and the second bearing 113b. The radial size (outer diameter) Q1 of the magnet 112 is larger than the radial size (outer diameter) P of the first bearing 113a and the second bearing 113b.

[0032] A cylindrical protective member 118 is provided in a manner that covers the radially outer side (in the direction of arrow c) of the magnet 112 (outer periphery). The protective member 118 is provided, for example, to prevent the magnet 112 from being damaged or scattered. However, the motor 100 may not include the protective member 118. In the radial direction, the outer side (in the direction of arrow c) of the protective member 118 is separated from the inner side (in the direction of arrow d) of the cover 114 and faces each other.

[0033] In the axial direction, a member (first pressing member) 117a is arranged between the magnet 112 and the first bearing 113a. In addition, in the axial direction, a member (second pressing member) 117b is arranged between the magnet 112 and the second bearing 113b. The first pressing member 117a and the second pressing member 117b have the same shape and the same size, and are arranged symmetrically with respect to a plane orthogonal to the axis X across the magnet 112.

[0034] The first pressing member 117a and the second pressing member 117b respectively include annular portions 117a1, 117b1, contact portions 117a2, 117b2, and protrusions 117a3, 117b3. In the radial direction, the inner diameter of the annular portions 117a1, 117b1 is the same as the outer diameter of the shaft S, or slightly larger than the outer diameter of the shaft S. The annular portions 117a1, 117b1 are fixed to the radially outer side (arrow c direction) of the shaft S by bonding or pressing. In the radial direction, the outer diameter of the annular portions 117a1, 117b1 is slightly larger than the outer diameter of the magnet 112, and is the same or substantially the same as the outer diameter of the protective member 118.

[0035] The contact portions 117a2 and 117b2 are annular portions that protrude axially from the surfaces of the annular portions 117a1 and 117b1 on the side close to the magnet 112 and contact the magnet 112. The contact portions 117a2 and 117b2 protrude from the radially outer side (in the direction of arrow c) of the surfaces of the annular portions 117a1 and 117b1 on the side close to the magnet 112, respectively.

[0036] The protrusions 117a3 and 117b3 are annular portions that protrude axially from the surface of the annular portions 117a1 and 117b1 that is away from the magnet 112 and are in contact with the inner ring 113ai of the first bearing 113a and the inner ring 113bi of the second bearing 113b, respectively. The protrusions 117a3 and 117b3 protrude from the radially inner side (in the direction of arrow d) of the annular portions 117a1 and 117b1, respectively.

[0037] The first pressing member 117a and the second pressing member 117b press the inner ring 113ai of the first bearing 113a and the inner ring 113bi of the second bearing 113b, respectively. The first pressing member 117a and the second pressing member 117b are formed of metal such as copper. The first pressing member 117a and the second pressing member 117b may also be formed of other raw materials, but since they serve as a balancer for adjusting the rotation balance of the shaft S, they are preferably formed of heavy metal.

[0038] The motor 100 is an internal rotor type brushless DC motor. When the motor 100 operates, the shaft S, the magnet 112, the inner ring 113ai of the first bearing 113a, the inner ring 113bi of the second bearing 113b, the first pressing member 117a, the second pressing member 117b and the protective member 118 rotate integrally.

[0039] The motor 100 of this embodiment can be manufactured by assembling the stator side components, namely the coil 120, the magnetic body 130, the housing 140 and the cover 150, and then inserting the separately assembled bearing device 110. Therefore, the coaxiality between the rotor side and the stator side and the coaxiality between the first bearing 113a and the second bearing 113b can be improved at the same time.

[0040] In the motor 100 of the present embodiment, the outer ring 113ao of the first bearing 113a and the outer ring 113bo of the second bearing 113b are preloaded in a manner that they are axially away from each other. As a result, the resonant frequency of the motor 100 is high and it is suitable for high-speed rotation applications. The preload is applied by the elastic member 116 arranged between the cover 114 and the retaining frame 115. Therefore, the motor 100 of the present embodiment does not need to provide a spring between the outer ring 113ao of the first bearing 113a and the outer ring 113bo of the second bearing 113b, so that a margin can be left in the internal space of the cover 114, and a motor with a large outer diameter of the magnet 112 and a large torque can be formed.

[0041] [Second Embodiment] Next, a second embodiment as an example of the present invention will be described with reference to the drawings. Figure 3 This is a cross-sectional view of only the bearing device 210 in the motor of the present embodiment. The motor of the present embodiment has the same structure as the motor 100 of the first embodiment, except that the bearing device 210 is provided instead of the bearing device 110. The bearing device 210 has the same structure as the bearing device 110 of the motor 100 of the first embodiment, except that the bearing device 210 is provided instead of the magnet 112. Hereinafter, components and parts having the same functions and structures as those of the first embodiment are marked with the same reference numerals as those of the first embodiment, and their detailed description is omitted.

[0042] In the present embodiment, the magnet 212 is a cylindrical permanent magnet having four magnetic poles by alternately magnetizing different magnetic poles (S pole and N pole) in the circumferential direction. However, the number of magnetic poles of the magnet 212 is not limited to four, and may be another number. In the radial direction, the inner diameter of the magnet 212 is larger than the outer diameter of the shaft S. The outer diameter of the magnet 212 is the same as the outer diameter of the magnet 112 of the motor 100 of the first embodiment. The magnet 212 is fixed to the shaft S via the cylindrical yoke 211.

[0043] In the axial direction, the length of the yoke 211 is the same as or substantially the same as the length of the magnet 212. In the radial direction, the inner diameter of the yoke 211 is the same as or slightly larger than the outer diameter of the shaft S. In the radial direction, the outer diameter of the yoke 211 is the same as or slightly smaller than the inner diameter of the magnet 212. The radially outer surface (in the direction of arrow c) of the shaft S and the radially inner surface (in the direction of arrow d) of the yoke 211, as well as the radially outer surface (in the direction of arrow c) of the yoke 211 and the radially inner surface (in the direction of arrow d) of the magnet 212 are fixed by press-fitting or bonding.

[0044] The yoke 211 and the magnet 212 are disposed between the first bearing 113a and the second bearing 113b in the axial direction and are separated from the first bearing 113a and the second bearing 113b. The radial size (outer diameter) Q2 of the magnet 212 is larger than the radial size (outer diameter) P of the first bearing 113a and the second bearing 113b.

[0045] The motor of this embodiment has high coaxiality and high torque based on the same principle as that of the motor 100 of the first embodiment. Furthermore, by fixing the magnet 212 to the shaft S via the yoke 211, the magnet 212 can be prevented from cracking and the magnet 212 can be easily magnetized.

[0046] [Third Embodiment] Next, a third embodiment as an example of the present invention will be described with reference to the drawings. Figure 4 This is a cross-sectional view of only the bearing device 310 in the motor of the present embodiment. The motor of the present embodiment has the same structure as the motor 100 of the first embodiment, except that the bearing device 310 is provided instead of the bearing device 110. The bearing device 310 has the same structure as the bearing device 110 of the motor 100 of the first embodiment, except that the spacer 119 is not provided and the cover 314 is provided instead of the cover 114. Hereinafter, for components and parts having the same functions and structures as those of the first embodiment, the same reference numerals as those of the first embodiment are marked, and their detailed description is omitted.

[0047] In this embodiment, the cover 314 of the bearing device 310 has a shape in which the cover 114 and the spacer 119 of the motor 100 of the first embodiment are integrated. The cover 314 includes an end 314a on one side located on the first bearing 113a side and an end 314b on the other side located on the second bearing 113b side. The cover 314 has a thick wall portion 314c at the other end 314b. The thick wall portion 314c has an equal outer diameter and a smaller inner diameter than other parts of the cover 314.

[0048] In the radial direction, the thick wall portion 314c of the cover 314 is directly fixed to the outside (arrow c direction) of the outer ring 113bo of the second bearing 113b. In the axial direction, the length of the thick wall portion 314c is the same or substantially the same as the length of the second bearing 113b. The radially outer side (arrow c direction) surface of the outer ring 113bo of the second bearing 113b and the radially inner side (arrow d direction) surface of the thick wall portion 314c of the cover 314 are fixed by press fitting or bonding.

[0049] The motor of this embodiment has high coaxiality and high torque based on the same principle as that of the motor 100 of the first embodiment. In addition, the motor of this embodiment has fewer parts and is easier to assemble than the motor 100 of the first embodiment.

[0050] [Fourth Embodiment] Next, refer to the attached Figure 5 A fourth embodiment as an example of the present invention will be described. Figure 5 This is a cross-sectional view of only the bearing device 410 in the motor of the present embodiment. The motor of the present embodiment has the same structure as the motor 100 of the first embodiment, except that the bearing device 410 replaces the bearing device 110. The bearing device 410 has the same structure as the bearing device 110 of the motor 100 of the first embodiment, except that the cover 414 replaces the cover 114, the retainer 415 replaces the retainer 115, and the elastic member 416 replaces the elastic member 116. Hereinafter, for components and parts having the same functions and structures as those of the first embodiment, the same reference numerals as those of the first embodiment are marked, and their detailed description is omitted.

[0051] The cover 414 includes an end 414a located on one side of the first bearing 113a and an end 414b located on the other side of the second bearing 113b. In the axial direction, the end 414a on one side of the cover 414 extends to one side than the end surface on one axial side of the first bearing 113a. The retainer 415 has a three-dimensional shape obtained by rotating a substantially J-shaped cross-section around the axis X. The retainer 415 includes an inner peripheral portion 415a, a connecting portion 415b, and an outer peripheral portion 415c. The connecting portion 415b forms an end 415g on one side of the retainer 415, and the retainer 415 includes an end 415g on one side and an end 415h on the other side. The radial size of the connecting portion 415b of the retainer 415 is larger than the radial size of the connecting portion 115b of the retainer 115 in the first embodiment. The cover 414 , the holder 415 , and the elastic member 416 have the same configurations as the cover 114 , the holder 115 , and the elastic member 116 in the first embodiment, unless otherwise mentioned.

[0052] In the present embodiment, the elastic member 416 is arranged on the end S1 side of one side of the shaft S relative to the first bearing 113a in the axial direction. In addition, the elastic member 416 is located between the first bearing 113a and the end S1 of one side of the shaft S in the axial direction. Moreover, the elastic member 416 is located at a position away from the first bearing 113a to the end S1 side of one side of the shaft S by a predetermined distance D in the axial direction. The cover 414 supports a part or the entirety of the outer peripheral surface of the first bearing 113a via the retainer 415. In addition, the elastic member 116 is located between the end 414a of one side of the cover 414 and the retainer 415 in the axial direction. The radial size (outer diameter) of the elastic member 416 is larger than the radial size (outer diameter) of the cover 414. Specifically, in the radial direction, the outer peripheral portion of the elastic member 416 is larger than the outer surface of the cover 414.

[0053] The retainer 415 has an opening 415e. In addition, a space T is formed inside the retainer 415 in the radial direction. In the axial direction, the first bearing 113a is opposite to the space. In addition, in the radial direction, the space T is opposite to the elastic member 416 via the inner peripheral portion 415a of the retainer 415. In addition, the elastic member 416 is axially arranged on the end S1 side of the axial side end surface of the first bearing, which is closer to the axis S.

[0054] The motor of this embodiment has high coaxiality and large torque based on the same principle as that described above in the motor 100 of the first embodiment. In addition, since the elastic member 416 is arranged on the end S1 side of one side of the shaft S relative to the first bearing 113a, the cover 414 can withstand the radial load acting on the first bearing 113a from the shaft S. Moreover, the cover 414 can suppress the displacement of the first bearing 113a in the radial direction. In addition, since the retaining frame can hold the elastic member 416 regardless of the size of the elastic member 416, the shape and material of the elastic member 416 can be selected, and the elastic force (or spring constant) acting on the cover 414 can be adjusted.

[0055] [Fifth Embodiment] Next, a fifth embodiment as an example of the present invention will be described with reference to the drawings. Figure 6This is a cross-sectional view of only the bearing device 510 in the motor of the present embodiment. The motor of the present embodiment has the same structure as the motor 100 of the first embodiment, except that the bearing device 510 is provided instead of the bearing device 110. The bearing device 510 has the same structure as the bearing device 110 of the motor 100 of the first embodiment, except that the bearing device 510 has components 517a and 517b instead of the first pressing member 117a and the second pressing member 117b (however, the bearing device 510 may not have the components 517a and 517b), does not have the protective member 118 (however, the bearing device 510 may have the protective member 118), and has a balancer (a first ring Ra and a second ring Rb). Hereinafter, for components and parts having the same functions and structures as those of the first embodiment, the same reference numerals as those of the first embodiment are marked, and their detailed description is omitted.

[0056] In the axial direction, an annular member 517a is arranged between the magnet 112 and the first bearing 113a. In addition, in the axial direction, an annular member 517b is arranged between the magnet 112 and the second bearing 113b. The members 517a and 517b have the same shape and the same size, and are arranged symmetrically with respect to a plane orthogonal to the axis X across the magnet 112.

[0057] In the radial direction, the inner diameter of the members 517a and 517b is the same as or slightly larger than the outer diameter of the shaft S. The members 517a and 517b are fixed to the radially outer surface (in the direction of arrow c) of the shaft S by bonding or press-fitting. In the radial direction, the outer diameter of the members 517a and 517b is smaller than the outer diameter of the magnet 112. In addition, in the radial direction, the outer diameter of the members 517a and 517b is slightly larger than the outer diameter of the inner ring 113ai of the first bearing 113a and the inner ring 113bi of the second bearing 113b, and slightly smaller than the inner diameter of the outer ring 113ao of the first bearing 113a and the outer ring 113bo of the second bearing 113b.

[0058] In the axial direction, the surface of one side (arrow a direction) of the component 517a contacts the surface of the other side (arrow b direction) of the inner ring 113ai of the first bearing 113a. In the axial direction, the surface of the other side (arrow b direction) of the component 517a contacts the surface of one side (arrow a direction) of the magnet 112. In the axial direction, the surface of the other side (arrow b direction) of the component 517b contacts the surface of one side (arrow a direction) of the inner ring 113bi of the second bearing 113b. In the axial direction, the surface of one side (arrow a direction) of the component 517b contacts the surface of the other side (arrow b direction) of the magnet 112.

[0059] The members 517a and 517b apply force to the inner ring 113ai of the first bearing 113a and the inner ring 113bi of the second bearing 113b, respectively. The members 517a and 517b are formed of metal such as copper, for example. The members 517a and 517b may also be formed of other materials such as resin or ceramics.

[0060] In the axial direction, on one side of the first bearing 113a (in the direction of arrow a), a first ring Ra is arranged at a distance from the first bearing 113a. In addition, in the axial direction, on the other side of the second bearing 113b (in the direction of arrow b), a second ring Rb is arranged at a distance from the second bearing 113b. In the axial direction, the first ring Ra is arranged at a position closer to one side (in the direction of arrow a) than the end of one side (in the direction of arrow a) of the cover 114. In addition, in the axial direction, the second ring Rb is arranged at a position closer to the other side (in the direction of arrow b) than the end of the other side (in the direction of arrow b) of the cover 114. In other words, in the axial direction, the first ring Ra and the second ring Rb are arranged on the outside of the cover 114. It should be noted that the motor of this embodiment may also have only one of the first ring Ra and the second ring Rb.

[0061] In the radial direction, the size (inner diameter) of the inner circumference of the first ring Ra and the second ring Rb is the same as or slightly larger than the size (outer diameter) of the outer circumference of the shaft S. The first ring Ra and the second ring Rb are fixed to the radially outer side (arrow c direction) of the shaft S by bonding or press-fitting. In the radial direction, the size (outer diameter) of the outer circumference of the first ring Ra and the second ring Rb is smaller than the outer diameter of the cover 114. However, in the radial direction, the outer diameter of the first ring Ra and the second ring Rb may be larger than the outer diameter of the cover 114.

[0062] The first ring Ra and the second ring Rb are made of metal such as copper or a non-magnetic body. The first ring Ra and the second ring Rb may be made of other materials, but because they can serve as a balancer for adjusting the rotational balance of the shaft S, they are preferably made of a material with a high specific gravity.

[0063] The motor of this embodiment has high coaxiality and large torque based on the same principle as that described above in the motor 100 of the first embodiment. In addition, by cutting at least one of the first ring Ra and the second ring Rb, the rotational balance can be adjusted even after the motor of this embodiment is assembled. The motor of this embodiment can ensure sufficient residual volume for cutting when adjusting the rotational balance by having the first ring Ra and the second ring Rb, and can improve the rotational balance. The rotational balance can be adjusted using a self-propelled balancer, for example.

[0064] The motor of the present invention has been described above by taking a preferred embodiment as an example, but the motor of the present invention is not limited to the configuration of the above embodiment. For example, in the above embodiment, the housing 140 is cylindrical, but in the motor of the present invention, the housing may be of any shape. In addition, in the above embodiment, the bearing devices 110, 210, 310, 410 have a first pressing member 117a and a second pressing member 117b, but in the motor of the present invention, the bearing device may have only one pressing member, or the bearing device may have no pressing member at all. In addition, the first pressing member 117a and the second pressing member 117b may not be of the same shape and the same size.

[0065] In the above embodiment, the outer diameters Q1 and Q2 of the magnets 112 and 212 are larger than the outer diameters P of the first bearing 113a and the second bearing 113b, but in the motor of the present invention, the outer diameter of the magnet may be equal to or smaller than the outer diameter of the bearing. In addition, in the above embodiment, the second bearing 113b has the same size and structure as the first bearing 113a, but in the motor of the present invention, the size and structure of the first bearing and the second bearing may be different from each other.

[0066] The following, with the attached Figure 1 Hereinafter, another motor mode (sixth embodiment and seventh embodiment) for implementing the present invention will be illustrated. The embodiments illustrated below are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention can be changed and improved according to the following embodiments without departing from the gist thereof. In addition, in the above-mentioned drawings, the size of each component is sometimes shown in an exaggerated or reduced manner or with hatching omitted for ease of understanding. The motors of the sixth and seventh embodiments sometimes include the same structure as the motors of the first to fifth embodiments, but for ease of recording, the names of the components in the motors of the first to fifth embodiments and the names of the corresponding components in the motors of the sixth and seventh embodiments are sometimes different from each other.

[0067] A motor having a stator is known, the stator including a yoke portion on the outer peripheral side and a plurality of teeth extending radially inward from the yoke portion, and coils are respectively wound around the teeth (for example, see Japanese Patent Publication No. 2012-105397). In the motor described in the document and other motors, a high occupancy rate of the coil is sometimes required. An example of the subject of the sixth embodiment and the seventh embodiment is to provide a motor with a coil wound at a high occupancy rate.

[0068] [Sixth Embodiment] Figure 7 It is a perspective view showing the motor 1001 according to the present embodiment. Figure 8This is a plan view of the motor 1001 as viewed from one side in the axial direction. Fig. 9 It is a cross-sectional view of the motor 1001 in the radial direction. Fig.10 It is a cross-sectional view of the motor 1001 in the axial direction.

[0069] like Figures 7 to 10 As shown, the motor 1001 has a generally cylindrical shape as a whole, and has as its main components: a cylindrical bearing device 1010, which is arranged in the center of the motor 1001; a cylindrical (ring-shaped) yoke 1030, which surrounds the bearing device 1010; a stator 1040, which is radially arranged from the bearing device 1010 toward the yoke 1030; a plurality of coils 1050, which are wound around the stator 1040; and a plurality of pressing members (members) 1060, which are inserted into the holes formed in the stator 1040. It should be noted that Figure 7 In the figure, for convenience, only one pressing member 1060 is shown.

[0070] The bearing device 1010 includes a shaft 1011 disposed at the center in the radial direction of the motor 1001. In the sixth embodiment and the seventh embodiment, the side close to the shaft 1011 in the radial direction is sometimes referred to as the "inner side" or simply "inner", and the side far from the shaft 1011 in the radial direction is sometimes referred to as the "outer side" or simply "outer". The shaft 1011 is the rotating shaft of the motor 1001, and the long dimension direction of the shaft 1011 is the axial direction of the motor 1001.

[0071] like Fig.10 As shown, the bearing device 1010 further includes a pair of bearings 1013a and 1013b, a pair of intermediate members 1017a and 1017b, a cylindrical magnet 1014, a protective member 1018, a cylindrical cover 1012, a retainer 1015, and the like.

[0072] The cover 1012 contains the shaft 1011, the magnet 1014, a pair of bearings 1013a, 1013b, a pair of intermediate members 1017a, 1017b, the magnet 1014, and the protective member 1018, etc. on the inner side. That is, the shaft 1011, the magnet 1014, a pair of bearings 1013a, 1013b, a pair of intermediate members 1017a, 1017b, and the protective member 1018, etc. are arranged on the inner side of the inner peripheral surface of the cover 1012. On the other hand, the stator 1040, a plurality of coils 1050, and the yoke 1030, etc. are arranged on the outer side of the outer peripheral surface 1012a of the cover 1012. For example, the cover 1012 can also be fixed to the motor housing not shown together with the yoke 1030, etc. In the present embodiment, the cover 1012 is formed of ceramic. However, the cover 1012 can also be formed of other raw materials such as non-magnetic metals and resins.

[0073] In the present embodiment, the pair of bearings 1013a and 1013b are respectively configured as ball bearings. However, the pair of bearings 1013a and 1013b may be various other bearings such as sleeve bearings, ball bearings having balls and outer rings that fit into the recessed portion of the outer peripheral surface of the shaft, etc. In the axial direction, the bearing 1013a of the pair of bearings 1013a and 1013b is arranged near the end of one side of the shaft 1011, and the bearing 1013b is arranged near the end of the other side of the shaft 1011.

[0074] It should be noted that in the sixth and seventh embodiments, for convenience, one axial side (bearing 1013a side) is sometimes referred to as the "upper side", "above" or simply "upper", and the other axial side (bearing 1013b side) is sometimes referred to as the "lower side", "below" or simply "lower".

[0075] The bearing 1013a includes an inner ring 1013a1 and an outer ring 1013a2, and the bearing 1013b includes an inner ring 1013b1 and an outer ring 1013b2. The inner rings 1013a1 and 1013b1 are fixed to the outer peripheral surface of the shaft 1011 by pressing or bonding, and the outer rings 1013a2 and 1013b2 are fixed to the inner peripheral surface of the cover 1012 directly or indirectly (via other components).

[0076] A pair of intermediate members 1017a and 1017b each have an annular shape, and the inner circumference of each is fixed to the outer circumference of the shaft 1011 by pressing or bonding. In the axial direction, the intermediate member 1017a is arranged on one side (upper side), and the intermediate member 1017b is arranged on the other side (lower side). The intermediate member 1017a is arranged on the other side (lower side) of the bearing 1013a, and the inner ring 1013a1 of the bearing 1013a is pressed toward one side (upper side) in the axial direction. The intermediate member 1017b is arranged on one side (upper side) of the bearing 1013b, and the inner ring 1013b1 of the bearing 1013b is pressed toward the other side (lower side) in the axial direction. It should be noted that it is also possible to change to set one of the pair of intermediate members 1017a and 1017b.

[0077] In the present embodiment, the magnet 1014 is a cylindrical permanent magnet obtained by alternately magnetizing different magnetic poles (S pole and N pole) in the circumferential direction. The magnet 1014 is fixed to the outer peripheral surface of the shaft 1011 by pressing or bonding. In the axial direction, the magnet 1014 is arranged between a pair of bearings 1013a and 1013b (in the present embodiment, between a pair of intermediate members 1017a and 1017b). In the present embodiment, a cylindrical protective member 1018 is installed on the outer peripheral surface of the magnet 1014. The protective member 1018 covers the outer peripheral surface of the magnet 1014, thereby preventing the magnet 1014 from being destroyed or scattered. An air gap is formed between the outer peripheral surface of the protective member 1018 and the inner peripheral surface of the cover 1012. Therefore, the magnet 1014 is opposite to the inner peripheral surface of the cover 1012 through the protective member 1018 and the air gap. It should be noted that the protective member 1018 may not be provided.

[0078] The retainer 1015 has a cylindrical shape, and an end 1015U on one side (upper side) in the axial direction is formed into an inverted U shape. The portion other than the end 1015U of the retainer 1015 is sandwiched between the outer peripheral surface of the outer ring 1013a2 of the bearing 1013a and the inner peripheral surface of the cover 1012. That is, the retainer 1015 is sandwiched between the outer ring 1013a2 and the cover 1012 and fixed to the cover 1012. The upper end of the cover 1012 is inserted into the end 1015U of the retainer 1015. The elastic member 1019 is accommodated inside the end 1015U of the retainer 1015 on the axial side (upper side) closer to the upper end of the cover 1012. The cover 1012 is urged toward the other side (lower side) in the axial direction by the elastic member 1019.

[0079] In such a motor 1001, the shaft 1011, the inner rings 1013a1 and 1013b1 of a pair of bearings 1013a and 1013b, the magnet 1014, the protective member 1018, and the pair of intermediate members 1017a and 1017b rotate integrally with respect to the stator group 1070 of the motor 1001 via the balls of the pair of bearings 1013a and 1013b. That is, in the present embodiment, the shaft 1011, the inner rings 1013a1 and 1013b1 of the pair of bearings 1013a and 1013b, the magnet 1014, the protective member 1018, and the pair of intermediate members 1017a and 1017b constitute the rotor 1020 in the motor 1001. In this way, the motor 1001 operates as an internal rotor type motor. On the other hand, the stator group 1070 is a group of elements that are relatively stationary with respect to the rotation of the shaft 1011. In this embodiment, the stator assembly 1070 includes outer rings 1013a2 and 1013b2 of a pair of bearings 1013a and 1013b, a cover 1012, a retainer 1015, an elastic member 1019, a stator 1040, a plurality of coils 1050, a plurality of pressing members 1060, and a yoke 1030.

[0080] Fig.11 It is a top view showing the motor 1001 omitting the bearing device 1010, and showing the components (stator 1040, multiple coils 1050, multiple pressing members 1060, and yoke 1030) of the stator assembly 1070 except for the components of the bearing device 1010 (a pair of outer rings 1013a2 and 1013b2 of the bearings 1013a and 1013b, the cover 1012, the retaining frame 1015, and the elastic member 1019, etc.). Fig.11 The components shown are arranged outside the bearing device 1010, so the stator 1040, the plurality of coils 1050, the plurality of pressing members 1060, and the yoke 1030 are collectively referred to as an outer stator assembly 1071. The outer stator assembly 1071 will be described in detail below.

[0081] like Figures 7 to 11 As shown in FIG. 1 , the yoke 1030 of the outer stator assembly 1071 is a cylindrical (ring-shaped when viewed from the axial direction) member as described above, and is formed of a magnetic body. The yoke 1030 includes two end faces in the axial direction (an upper end face 1034 and a lower end face 1035) and two side faces in the radial direction (an outer peripheral portion 1036 and an inner peripheral portion 1037). The yoke 1030 is provided with a plurality of openings 1031 extending in the radial direction along the circumference of the yoke 1030 (see in particular FIG. 1031 ). Fig. 9). In this embodiment, the six openings 1031 are arranged at equal intervals (60° intervals) with the axis 1011 as a reference when viewed from the axial direction. These openings 1031 are respectively formed in the same shape and size. It should be noted that the "same" in this specification includes differences in the usual manufacturing error level.

[0082] Fig.12 yes Fig.11 The cross-sectional view at line AA is shown. Fig.13 It means that Fig.11 The illustrated perspective view is a state in which one of a plurality of stator components 1041 described later in the outer stator assembly 1071 is removed from the yoke 1030 .

[0083] like Fig.12 and Fig.13 As shown, the openings 1031 of the yoke 1030 extend in the axial direction from a portion located on the lower end face side relative to the upper end face 1034 of the yoke 1030 to a portion located on the upper end face 1034 side relative to the lower end face 1035, and in the present embodiment, are formed in a rectangular shape when viewed from the radial direction. In addition, in each opening 1031, the axial length and the length in the circumferential direction of the yoke 1030 are the same in the radial direction. The openings 1031 each have a first inner surface 1032 located on the upper end face 1034 (one end face) side of the yoke 1030 and a second inner surface 1033 located on the lower end face (the other end face) side of the yoke 1030.

[0084] like Fig.12 As shown in FIG. 1 , the yoke 1030 is formed by a plurality of plate-shaped magnetic bodies 1039 stacked in the axial direction. Fig.12In the figure, the other magnetic bodies 1039 except the four magnetic bodies 1039 on one side (upper side) and the other side (lower side) in the axial direction are omitted, and the omission is indicated by a black dot. In the present embodiment, the thickness of each of the plurality of magnetic bodies 1039 in the axial direction is the same. However, the thickness of each of the plurality of magnetic bodies 1039 in the axial direction may be different. In addition, in the present embodiment, the two inner surfaces in the circumferential direction of the opening 1031 of the yoke 1030 are surfaces formed by connecting the circumferential side surfaces of each of the plurality of magnetic bodies 1039 in the axial direction except the magnetic body 1039 stacked on the one side (upper side) in the axial direction (for convenience, also recorded as the magnetic body 1039A) and the magnetic body 1039 stacked on the other side (lower side) in the axial direction (for convenience, also recorded as the magnetic body 1039B). In addition, the first inner surface 1032 of the opening 1031 is a part of the lower surface of the magnetic body 1039A, and the second inner surface 1033 of the opening 1031 is a part of the upper surface of the magnetic body 1039B. The yoke 1030 having such a plurality of openings 1031 can also be manufactured, for example, by the following process: after stacking a plurality of magnetic bodies 1039 other than the magnetic bodies 1039A and 1039B in the axial direction, they are fixed by, for example, riveting or adhesive materials to form a stacked body, and portions corresponding to the plurality of openings 1031 are hollowed out from the stacked body. Finally, the magnetic bodies 1039A and 1039B are fixed to the surface on one side and the surface on the other side of the stacked body in the axial direction by riveting or adhesive materials.

[0085] In particular, Fig. 9 , Fig.11 ,as well as Fig.13 As shown, the stator 1040 includes a plurality of stator components 1041 having the same shape and size and formed of the same material. That is, the stator 1040 is composed of a plurality of stator components 1041 separated from each other. In the present embodiment, the stator 1040 includes six stator components 1041. The plurality of stator components 1041 each have a symmetrical shape when viewed from the axial direction. The axial length of the stator component 1041 is the same along the radial direction. The stator component 1041 includes a magnetic pole portion 1042 and a spoke 1090. That is, the stator 1040 has a plurality of magnetic pole portions 1042 and a plurality of spokes 1090. A coil 1050 is wound around each of the plurality of spokes 1090.

[0086] like Fig.12 As shown, the plurality of stator components 1041 are respectively formed by a plurality of plate-shaped magnetic bodies 1049 stacked in the axial direction. That is, the plurality of magnetic pole portions 1042 and the plurality of spokes 1090 are respectively formed by a plurality of magnetic bodies 1049 stacked in the axial direction. Fig.12, the other magnetic bodies 1049 except the two magnetic bodies 1049 on one side in the axial direction and the three magnetic bodies 1049 on the other side in the axial direction are omitted, and the omission is indicated by a black dot. In the present embodiment, the thickness of each of the plurality of magnetic bodies 1049 in the axial direction is the same. In addition, in the present embodiment, the thickness of each of the plurality of magnetic bodies 1049 in the axial direction is the same as the thickness of each of the plurality of magnetic bodies 1039 forming the yoke 1030 in the axial direction. Moreover, in the present embodiment, the number of the plurality of magnetic bodies 1049 forming the stator member 1041 (i.e., the plurality of magnetic bodies 1049 forming the spokes 1090) is less than the number of the plurality of magnetic bodies 1039 forming the opening 1031 of the yoke 1030 (i.e., the plurality of magnetic bodies 1039 other than the magnetic bodies 1039A and the magnetic bodies 1039B). In the present embodiment, the number of the plurality of magnetic bodies 1049 forming the spokes 1090 is one less than the number of the plurality of magnetic bodies 1039 forming the opening 1031. Therefore, the length of the stator member 1041 (spokes 1090 ) in the axial direction is shorter than the length of the opening 1031 of the yoke 1030 in the axial direction.

[0087] It should be noted that the thickness of each of the plurality of magnetic bodies 1049 in the axial direction may be different from that of each of the plurality of magnetic bodies 1049 in the axial direction and the thickness of each of the plurality of magnetic bodies 1039 forming the yoke 1030 in the axial direction may be different from that of each of the plurality of magnetic bodies 1039 in the axial direction.

[0088] The magnetic pole portion 1042 of the stator component 1041 is the innermost portion of the stator component 1041. The magnetic pole portion 1042 is connected to the inner end of the spoke 1090. When viewed from the axial direction, the magnetic pole portion 1042 has a shape that extends circumferentially from the inner end of the spoke 1090 toward the inside, and the length in the circumferential direction decreases as it goes further inward. The end face 1042a on the inner circumferential side of the magnetic pole portion 1042 has a shape corresponding to the outer circumferential surface of the cover 1012 of the bearing device 1010, and is in substantial surface contact with the outer circumferential surface 1012a of the cover 1012. That is, as shown in FIG. Fig.11 As shown, when the outer stator assembly 1071 is observed from the axial direction, the end faces 1042a of the plurality of magnetic pole portions 1042 are located on a circle centered on the center of the motor 1001 (the center of the shaft 1011), as shown in FIG. Fig. 9As shown, the circle where these end faces 1042a are located is substantially concentric with the shaft 1011, the magnet 1014, and the cover 1012 that constitute the bearing device 1010. The end face 1042a of the magnetic pole portion 1042 faces the magnet 1014 across the cover 1012 of the bearing device 1010 and the air gap between the magnet 1014 and the cover 1012. Therefore, by supplying current to the coil 1050 wound around the spoke 1090, a magnetic interaction is generated between the end face 1042a of the magnetic pole portion 1042 and the magnet 1014, and as a result, the rotor 1020 including the shaft 1011 rotates relative to the stator assembly 1070.

[0089] like Fig. 9 As shown, the spoke 1090 of the stator component 1041 includes a first portion 1043 located at an inner side and a second portion 1045 located at an outer side of the first portion 1043 .

[0090] When viewed from the axial direction, the first portion 1043 of the spoke 1090 has a substantially rectangular shape except for the outer end portion 1044. The coil 1050 is wound around the rectangular portion (the portion except for the outer end portion 1044) via an insulating portion such as an insulator (not shown). The outer end portion 1044 of the first portion 1043 has a shape extending in the circumferential direction as it goes to the outer side. The end face 1044a of the outer end portion 1044 has a shape corresponding to the inner circumference 1037 of the yoke 1030, and the length of the end face 1044a is longer than the length of the opening 1031 of the yoke 1030 in the circumferential direction of the yoke 1030. The end face 1044a is substantially in surface contact with the inner circumference 1037 of the yoke 1030. That is, the plurality of spokes 1090 are respectively connected to the plurality of magnetic pole portions 1042 and the inner circumference 1037 of the annular yoke 1030.

[0091] The second portion 1045 of the spoke 1090 includes a rectangular portion 1048 that is rectangular when viewed from the axial direction and a semicircular portion 1048c that is semicircular and protrudes outward when viewed from the axial direction. The outer end of the rectangular portion 1048 is connected to the inner end of the semicircular portion 1048c, and the inner end of the rectangular portion 1048 is connected to the outer end 1044 of the first portion 1043. In the circumferential direction of the yoke 1030, the length of the second portion 1045 is slightly shorter than the length of the opening 1031 of the yoke 1030. In addition, in the radial direction, the length of the second portion 1045 is longer than the length of the opening 1031. Therefore, especially as Fig.13 and Fig.14 As shown, the stator member 1041 is inserted into the opening 1031 of the yoke 1030 from the inside to the outside of the yoke 1030 with the outer end 1048ca of the semicircular portion 1048c as the front end, so that the semicircular portion 1048c and a part of the rectangular portion 1048 pass through the opening 1031 and protrude further outward than the yoke 1030. It should be noted that Fig.14 It is a plan view showing a state where one of the plurality of stator components 1041 passes through the opening 1031 .

[0092] Specifically, when the stator member 1041 is inserted into the opening 1031, the end surface 1044a of the first portion 1043 of the spoke 1090 finally contacts the inner circumference 1037 of the yoke 1030, thereby restricting the stator member 1041 from passing further outward. In this way, the insertion of the stator member 1041 into the opening 1031 is completed. In the state where the insertion of the stator member 1041 into the opening 1031 is completed, as shown in FIG. Fig.12 As shown, a portion of the lower end surface of the rectangular portion 1048 of the second portion 1045 (i.e., the lower end surface 1041D of the stator component 1041) contacts the second inner surface 1033 of the opening 1031, and a gap G is formed between the upper end surface of the rectangular portion 1048 of the second portion 1045 (i.e., the upper end surface 1041U of the stator component 1041) and the first inner surface 1032 of the opening 1031. In the present embodiment, the axial thickness of the gap G is equal to the axial thickness of a piece of magnetic body 1039, and is also equal to the axial thickness of a piece of magnetic body 1049. Then, when the insertion of all stator components 1041 into the opening 1031 is completed, as shown in FIG. Fig.11 As shown, a circular space CA is formed on the inner side of each end surface 1042a of the plurality of stator components 1041 when viewed from the axial direction. In the space CA, for example, the bearing device 1010 can be inserted from one side toward the other side in the axial direction. On the other hand, after the bearing device 1010 is removed, the stator component 1041 is moved from the outside to the inside toward the space CA, thereby the stator component 1041 can be removed from the yoke 1030. In this way, the plurality of stator components 1041 can be respectively mounted and removed relative to the annular yoke 1030. That is, the plurality of spokes 1090 can be respectively mounted and removed relative to the annular yoke 1030.

[0093] like Fig.13 and Fig.14As shown, in each stator component 1041, the spoke 1090 has an outer hole portion 1046 extending in the axial direction and an inner hole portion 1047 extending in the axial direction. That is, the plurality of spokes 1090 of the stator 1040 have a plurality of hole portions extending in the axial direction. In the present embodiment, the six spokes 1090 as a whole have six outer hole portions 1046 and six inner hole portions 1047. The plurality of outer hole portions 1046 are respectively located outside the plurality of inner hole portions 1047. In the present embodiment, the outer hole portion 1046 and the inner hole portion 1047 extend from the upper end surface 1041U of the stator component 1041 toward the other side (lower side) in the axial direction, respectively. It should be noted that the outer hole portion 1046 and the inner hole portion 1047 may extend from the lower end surface 1041D of the stator component 1041 toward one side (upper side) in the axial direction, or may penetrate the stator component 1041 in the axial direction. In the present embodiment, the outer hole portion 1046 and the inner hole portion 1047 are formed in a circular shape when viewed from the axial direction, and are formed so that the center of each is located on a straight line passing through the center of the stator member 1041 in the circumferential direction of the yoke 1030. In addition, in the present embodiment, the outer hole portion 1046 is formed so that approximately half of its area is located in the semicircular portion 1048c, and the other approximately half of its area is located in the rectangular portion 1048. On the other hand, the inner hole portion 1047 is formed with a smaller diameter than the outer hole portion 1046, and approximately half of its area is located in the rectangular portion 1048 (second portion 1045), and the other approximately half of its area is located in the first portion 1043. It should be noted that the diameter of the inner hole portion 1047 does not need to be smaller than the diameter of the outer hole portion 1046, and may be the same diameter or a larger diameter than the diameter of the outer hole portion 1046. In addition, the positional relationship between the inner hole portion 1047 and the outer hole portion 1046 and the shapes of each are not limited to the above. For example, the inner hole portion 1047 may be radially located on the inner side of the inner circumferential surface of the annular yoke 1030, with the inner hole portion 1047 being exposed as a whole, and the outer hole portion 1046 may be radially located at a position overlapping with the annular yoke 1030, with only a portion of the outer hole portion 1046 being exposed, and the shapes of the inner hole portion 1047 and the outer hole portion 1046 may be polygonal, including a quadrilateral, an ellipse, or the like.

[0094] The plurality of stator components 1041 are respectively inserted into the insertion openings 1031 of the yoke 1030. Figure 8 and Fig. 9 In the state, when viewed from one side in the axial direction, the outer hole portion 1046 is entirely exposed from the yoke 1030 at a position adjacent to the yoke 1030. Figure 8 and Fig. 9In the state, when viewed from one side in the axial direction, the inner semicircle of the inner hole portion 1047 is exposed from the yoke 1030 at a position adjacent to the yoke 1030. That is, in the radial direction, the plurality of hole portions (the outer hole portion 1046 and the inner hole portion 1047) are respectively adjacent to the annular yoke 1030. In the present embodiment, a pressing member (member) 1060 is inserted into each of the inner hole portions 1047 of the plurality of stator members 1041. That is, in the present embodiment, six pressing members 1060 are inserted into the stator 1040.

[0095] The plurality of pressing members 1060 are respectively formed of the same shape, size, and material. Fig.15 is a perspective view showing the pressing member 1060, Fig.16 1060 is a side view showing the pressing member 1060. Fig.15 and Fig.16 As shown, the pressing member 1060 of the present embodiment is a semi-conical wedge-shaped member, including: a first end face 1061 and a second end face 1064, which are semicircular when viewed from the axial direction; a first side face 1062, which is a semicircular curved surface; and a second side face 1063, which is a plane in the shape of an isosceles trapezoid. The outer shape of the second end face 1064 is smaller than that of the first end face 1061. The second side face 1063 extends in a direction parallel to the long dimension direction of the pressing member 1060. The ridgeline 1062E of the first side face 1062 is inclined relative to the long dimension direction of the pressing member 1060, that is, relative to the second side face 1063, so as to approach the second side face 1063 as it moves from the first end face 1061 side to the second end face 1064 side. In the present embodiment, such a pressing member 1060 is inserted into the inner hole portion 1047.

[0096] Fig.17 1060 is a perspective view showing the state where the pressing member 1060 begins to be inserted into the inner hole 1047. Fig.17As shown by the middle arrow, in the present embodiment, the pressing member 1060 is inserted from one side (upper side) toward the other side (lower side) in the axial direction of the inner hole portion 1047. Further, the pressing member 1060 is inserted into the inner hole portion 1047 with the second end face 1064 of the pressing member 1060 as the front end, the first side face 1062 facing inward, and the second side face 1063 facing outward. During the insertion, a portion of the second side face 1063 is brought into contact with the inner peripheral portion 1037 of the yoke 1030. It should be noted that the "contact" mentioned here includes not only contact and close contact, but also includes, for example, a situation where a portion of the pressing member 1060 is engaged with a portion of the yoke 1030. In the present embodiment, a portion of the second side face 1063 is brought into line contact or surface contact with the inner peripheral portion 1037. Thus, in the present embodiment, since the second side surface 1063 of the pressing member 1060 is in line contact or surface contact with the inner peripheral portion 1037, the ridge line 1062E of the first side surface 1062 is inclined relative to the inner peripheral portion 1037 as the side surface of the yoke 1030 so as to approach the inner peripheral portion 1037 as it goes from one side (upper side) to the other side (lower side) in the axial direction. Then, while maintaining a state in which a portion of the second side surface 1063 is in contact with the inner peripheral portion 1037 of the yoke 1030, as shown in FIG. Fig.17 As shown by the middle arrow, when the pressing member 1060 is inserted toward the other side (lower side) of the inner hole portion 1047 in the axial direction, since the first side surface 1062 is inclined relative to the inner peripheral portion 1037 as described above, as the pressing member 1060 is inserted downward, the stator member 1041 is forced inward by the first side surface 1062 and moves inward. As a result, the end surface 1042a of the magnetic pole portion 1042 of the stator member 1041 finally contacts the outer peripheral surface 1012a of the cover 1012 arranged on the inner side of the stator member 1041 (see Fig. 9 ). In this way, the stator member 1041 is firmly positioned in the radial direction, and further insertion of the pressing member 1060 to the lower side is restricted. Figure 7 The stator component 1041 is positioned and the insertion of the pressing member 1060 to the lower side is restricted. In this way, in the present embodiment, the plurality of stator components 1041 are positioned in the radial direction by contacting the outer peripheral surface 1012a of the cover 1012, so that when viewed from the axial direction, the trajectory formed by the end surface 1042a of each magnetic pole portion 1042 of the plurality of stator components 1041 coincides with the circular trajectory of the outer peripheral surface 1012a of the cover 1012. That is, in the present embodiment, when viewed from the axial direction, the end surface 1042a of each of the plurality of stator components 1041 is arranged on a circle concentric with the outer peripheral surface 1012a, thereby realizing the arrangement of the plurality of stator components 1041 with high roundness.

[0097] It should be noted that, in this embodiment, the pressing member 1060 is restricted from being inserted downward. Figure 7 In the state, the axial position of the first end face 1061 of the pressing member 1060 is the same as the axial position of the upper surface 1051 of the coil 1050 wound on the spoke 1090, or is located between the upper surface 1051 of the coil 1050 and the upper end face 1034 of the yoke 1030. Thus, for example, when a substrate or other component is arranged on the axial side (upper side) of the upper surface 1051 of the coil 1050, such a substrate or other component can be arranged without interfering with the pressing member 1060.

[0098] Moreover, in Figure 7 In the state, the stator member 1041 inserted into the opening 1031 is pressed by the pressing member 1060 in the state of being positioned in the radial direction, so that Fig.12 As shown by the middle arrow, the stator member 1041 is also urged toward the other side (lower side) in the axial direction. That is, the plurality of magnetic bodies 1049 forming the spokes 1090 are urged from the upper end surface 1034 (one end surface) side of the yoke 1030 toward the lower end surface 1035 (the other end surface) side. Therefore, as a result of the stator member 1041 inserted into the opening 1031 being urged toward the other side (lower side) in the axial direction, in other words, as a result of the plurality of magnetic bodies 1049 forming the spokes 1090 being urged from the first inner surface 1032 (the inner surface located at one end surface side) toward the second inner surface 1033 (the inner surface located at the other end surface side) of the opening 1031 of the yoke 1030, the stator member 1041 is positioned in the axial direction in a state where the lower surface of the stator member 1041 is in surface contact with the upper surface of the magnetic body 1039B of the yoke 1030 (the second inner surface 1033 of the opening 1031). As described above, since the axial thickness of each of the plurality of magnetic bodies 1049 forming the stator component 1041 (spokes 1090) is the same as the axial thickness of each of the plurality of magnetic bodies 1039 forming the yoke 1030, the positions of each of the plurality of magnetic bodies 1049 are the same as the positions of each of the plurality of magnetic bodies 1039 in the axial direction. Further, in the circumferential direction of the yoke 1030, the plurality of magnetic bodies 1049 forming the spokes 1090 are respectively opposed to any one of the plurality of magnetic bodies 1039 forming the yoke 1030 in the axial direction without offset. Thus, in the present embodiment, the position of the boundary of a pair of magnetic bodies 1049, 1049 adjacent to each other in the axial direction is the same as the position of the boundary of a pair of magnetic bodies 1039, 1039 adjacent to each other in the axial direction. It should be noted that, as described above, in the present embodiment, the number of the plurality of magnetic bodies 1049 forming the spokes 1090 is one piece less than the number of the plurality of magnetic bodies 1039 forming the opening 1031 among the plurality of magnetic bodies 1039 forming the yoke 1030. Therefore, the axial thickness of the above-mentioned gap G is the same as the thickness of one magnetic body 1049, and is also the same as the thickness of one magnetic body 1039.

[0099] As described above, the motor 1001 of the present embodiment includes the annular yoke 1030 having two end faces (the upper end face 1034 and the lower end face 1035) in the axial direction and the stator 1040. The stator 1040 of the motor 1001 includes: a plurality of magnetic poles 1042; a plurality of spokes 1090 connected to the plurality of magnetic poles 1042 and the inner circumference 1037 of the annular yoke 1030; and a plurality of coils 1050 wound around the plurality of spokes 1090. Furthermore, in the motor 1001, the plurality of spokes 1090 can be loaded and unloaded relative to the yoke 1030, respectively. The yoke 1030 and the plurality of spokes 1090 are respectively formed by a plurality of magnetic bodies 1039 and 1049 stacked in the axial direction. The plurality of magnetic bodies 1049 forming the spokes 1090 are forced from the end face (upper end face 1034) side of one of the two end faces (upper end face 1034 and lower end face 1035) of the yoke 1030 toward the end face (lower end face 1035) side of the other end face.

[0100] According to such motor 1001, since the plurality of spokes 1090 (i.e., stator member 1041) can be attached to and detached from yoke 1030, coil 1050 can be wound around spoke 1090 before inserting spoke 1090 into yoke 1030. In other words, coil 1050 can be wound around spoke 1090 without interfering with other spokes 1090 adjacent in the circumferential direction. Therefore, coil 1050 can be wound with a high occupancy, and motor 1001 becomes a motor in which coil is wound with a high occupancy rate.

[0101] In addition, according to the motor 1001, as described above, the multiple magnetic bodies 1049 forming the spokes 1090 are forced from the end face (upper end face 1034) side of one of the two end faces (upper end face 1034 and lower end face 1035) of the yoke 1030 toward the end face (lower end face 1035) side of the other end face, so that in each of the multiple openings 1031 of the yoke 1030, the position of each of the multiple magnetic bodies 1049 is axially the same as the position of each of the multiple magnetic bodies 1039, and further, the position of the boundary of a pair of magnetic bodies 1049, 1049 adjacent to each other in the axial direction is the same as the position of the boundary of a pair of magnetic bodies 1039, 1039 adjacent to each other in the axial direction. According to such a configuration, when magnetic flux is generated in each of the plurality of magnetic bodies 1049 forming the spoke 1090 by the coil 1050 wound around the spoke 1090, the magnetic flux can be transmitted to the plurality of magnetic bodies 1039 forming the yoke 1030 without being hindered by the boundary between a pair of adjacent magnetic bodies 1039, 1039. In this way, according to the motor 1001, the deviation of the magnetic circuit can be suppressed, and, for example, high efficiency can be achieved.

[0102] It should be noted that even if the thickness of each of the plurality of magnetic bodies 1039 is different, or the thickness of each of the plurality of magnetic bodies 1049 is different, or the thickness of each of the plurality of magnetic bodies 1049 in the axial direction is different from the thickness of each of the plurality of magnetic bodies 1039 in the axial direction forming the yoke 1030, if the degree of difference is within the generally conceivable range, the plurality of magnetic bodies 1049 forming the spokes 1090 are urged from one end face (upper end face 1034) side of the two end faces (upper end face 1034 and lower end face 1035) of the yoke 1030 toward the other end face (lower end face 1035) side, and the positions of the plurality of magnetic bodies 1049 in the opening 1031 in the axial direction are firmly positioned, so that the position of the boundary of a pair of magnetic bodies 1049, 1049 adjacent to each other in the axial direction is substantially consistent with the position of the boundary of a pair of magnetic bodies 1039, 1039 adjacent to each other in the axial direction. Therefore, the deviation of the magnetic circuit can be suppressed, and, for example, high efficiency can be achieved.

[0103] In this embodiment, the side surfaces of the plurality of plate-shaped magnetic bodies 1039 and the plurality of magnetic bodies 1049 forming the opening 1031 are as follows: Fig. 12A As shown. When forming each magnetic body 1039, 1049, a piece of magnetic body is placed on a die (so-called punch), and another die (so-called punch) is used to punch the magnetic body from above, and force is applied to the magnetic body to cut it into a predetermined size, thereby obtaining magnetic bodies 1039, 1049. The side surfaces of the magnetic bodies 1039, 1049 obtained by the punching process in this way have a curved surface WF (so-called collapsed edge), a shear surface XF (cut surface) extending in the axial direction, a fracture surface YF recessed toward the inside of the magnetic body 1039, 1049, and a portion ZF protruding from the fracture surface (so-called burr). Among the curved surface WF, the shear surface XF, the fracture surface YF, and the protruding portion ZF constituting the side surfaces of the plurality of magnetic bodies 1039, 1049, the shear surface XF of the magnetic body 1039 contacts the shear surface XF of the magnetic body 1049 to form a magnetic circuit. The shear planes XF of the magnetic bodies 1039 and 1049 occupy 30% to 50% of the entire side surfaces of the magnetic bodies 1039 and 1049. Therefore, the thicknesses of the magnetic bodies 1039 and 1049 are preferably substantially the same to such an extent that the shear planes XF of the magnetic bodies 1039 and 1049 can contact each other.

[0104] [Seventh Embodiment] Next, a motor 1002 according to a seventh embodiment will be described. Fig.18 1 is a perspective view showing a motor 1002 according to an embodiment of the present invention. Fig.18As shown, the motor 1002 of this embodiment has a substantially similar structure to the motor 1001 of the sixth embodiment, but the structure of the bearing device, the structure of the pressing member, and the position where the pressing member is inserted are mainly different from the motor 1001 of the sixth embodiment. Therefore, the following mainly describes these differences, and regarding other structures, the same figure numerals as the sixth embodiment are used and the description is omitted.

[0105] like Fig.18 As shown, the bearing device 1100 of the motor 1002 is different from the bearing device 1010 of the motor 1001 and does not have a cover such as the cover 1012. Therefore, in the motor 1002, the cylindrical magnet 1014 and the protective member 1018 are exposed, and the protective member 1018 is opposite to the end surface 1042a of the magnetic pole portion 1042 of the stator member 1041 through an air gap. It should be noted that in the motor 1002, the outer rings 1013a2, 1013b2 of the pair of bearings 1013a, 1013b (that is, the components constituting the stator assembly 1070) can also be directly or indirectly fixed to a housing not shown in the figure.

[0106] In the motor 1002, similarly to the motor 1001, the spokes 1090 (stator member 1041) are respectively inserted into the plurality of openings 1031 of the yoke 1030. In addition, in the motor 1002, similarly to the motor 1001, the plurality of magnetic bodies 1049 forming the spokes 1090 are urged by a pressing member from the upper end surface 1034 side toward the lower end surface 1035 side of the yoke 1030. However, in the motor 1002, a pressing member 1160 different from the pressing member 1060 is used as a pressing member, and unlike the motor 1001, the pressing member 1160 is inserted into the outer hole 1046 of the spoke 1090 (stator member 1041).

[0107] Fig.19 is a perspective view showing the pressing member 1160, Fig. 20 This is a bottom view. Fig.19 and Fig. 20As shown in FIG. 1 , the pressing member 1160 has a shape in which a portion of the top surface of a member having a large-diameter top surface and a small-diameter bottom surface is cut away in parallel with the long-dimension direction of the pressing member 1160. That is, the pressing member 1160 includes a first end surface 1161 located on one side in the long-dimension direction of the pressing member 1160, a second end surface 1164 located on the other side, a first surface 1162 occupying most of the side surface of the pressing member 1160, and a second surface 1163 which is a surface of the side surface of the pressing member 1160 other than the first surface 1162. The second end surface 1164 is circular when the pressing member 1160 is viewed from the long-dimension direction. When the pressing member 1160 is viewed from the long-dimension direction, the first end surface 1161 has a shape in which a portion of a circle having a larger diameter than the second end surface 1164 is cut away, and has a larger area than the second end surface 1164. The first surface 1162 is a curved surface among the surfaces formed by removing a portion of a conical surface whose diameter decreases as it moves from the first end surface 1161 to the second end surface 1164 from the first end surface 1161 in a direction parallel to the long dimension direction of the pressing member 1160. The second surface 1163 is a plane parallel to the long dimension direction of the pressing member 1160 among the above-removed surfaces. When the pressing member 1160 is observed from the side, the ridgeline 1162E of the first surface 1162 is inclined relative to the second surface 1163 parallel to the long dimension direction of the pressing member 1160 in a manner approaching the central axis of the pressing member 1160 as it moves from the first end surface 1161 to the second end surface 1164. It should be noted that the central axis of the pressing member 1160 is a straight line that passes through the respective centers of the first end surface 1161 and the second end surface 1164 and extends in the long dimension direction of the pressing member 1160.

[0108] In the motor 1002, as Fig.18 As shown, such a plurality of (six in this embodiment) pressing members 1160 are respectively inserted into a plurality of (six in this embodiment) outer hole portions 1046. It should be noted that in Fig.18In the figure, for convenience, only one pressing member 1160 is shown. Specifically, the pressing member 1160 is inserted from one side (upper side) of the outer hole portion 1046 in the axial direction toward the other side (lower side). Further, with the second end face 1164 of the pressing member 1160 as the front end, the second face 1163 is facing inward, and the first face 1162 is facing outward, the pressing member 1160 is inserted into the outer hole portion 1046. During the insertion, a portion of the second face 1163 is brought into contact with the outer peripheral portion 1036 of the yoke 1030. It should be noted that the "contact" mentioned here not only includes contact and close contact, but also includes, for example, a portion of the pressing member 1160 is engaged with a portion of the yoke 1030. In the present embodiment, a portion of the second face 1163 is brought into line contact or surface contact with the outer peripheral portion 1036. Thus, in the present embodiment, since the second surface 1163 of the pressing member 1160 is in line contact or surface contact with the outer peripheral portion 1036, the ridgeline 1162E of the first surface 1162 is inclined relative to the side surface of the yoke 1030, i.e., the outer peripheral portion 1036, in a manner that approaches the outer peripheral portion 1036 as it moves from one side (upper side) in the axial direction to the other side (lower side). Furthermore, while maintaining a state in which a portion of the second surface 1163 is in contact with the outer peripheral portion 1036 of the yoke 1030, and inserting the pressing member 1160 toward the lower side of the outer hole portion 1046, since the first surface 1162 is inclined relative to the outer peripheral portion 1036 as described above, as the pressing member 1160 is inserted downwardly, the stator member 1041 is forced outward by the first surface 1162 and moves outward. As a result, the end surface 1044a (refer to Fig.14 ) finally contacts the inner circumference 1037 of the yoke 1030. In this way, the stator member 1041 is firmly positioned in the radial direction, and the insertion of the pressing member 1160 further downward is restricted. In this way, the state where the stator member 1041 is positioned and the insertion of the pressing member 1060 downward is restricted is shown in FIG. Fig.18 In this embodiment, Fig.18 In this state, the axial position of the first end face 1161 of the pressing member 1160 is the same as the axial position of the upper surface 1051 of the coil 1050 wound on the spoke 1090, or is located between the upper surface 1051 of the coil 1050 and the upper end face 1034 of the yoke 1030.

[0109] Moreover, in Fig.18 In the state, the stator member 1041 inserted into the opening 1031 is pressed by the pressing member 1160 in the state of being radially positioned, so that Fig.12As shown by the middle arrow, the stator member 1041 is also urged toward the other side (lower side) in the axial direction. That is, the plurality of magnetic bodies 1049 forming the spokes 1090 are urged from the upper end surface 1034 (one end surface) side of the yoke 1030 toward the lower end surface 1035 (the other end surface) side. Therefore, as a result of the stator member 1041 inserted into the opening 1031 being urged downward, in other words, as a result of the plurality of magnetic bodies 1049 forming the spokes 1090 being urged from the first inner surface 1032 (the inner surface located at one end surface side) toward the second inner surface 1033 (the inner surface located at the other end surface side) of the opening 1031 of the yoke 1030, the stator member 1041 is positioned in the axial direction in a state where the lower surface of the stator member 1041 is in surface contact with the upper surface of the magnetic body 1039B of the yoke 1030 (the second inner surface 1033 of the opening 1031).

[0110] As described above, the motor 1002 of this embodiment includes the annular yoke 1030 having two end faces (upper end face 1034 and lower end face 1035) in the axial direction and the stator 1040. The stator 1040 of the motor 1002 includes: a plurality of magnetic poles 1042; a plurality of spokes 1090 connected to the plurality of magnetic poles 1042 and the inner circumference 1037 of the annular yoke 1030; and a plurality of coils 1050 wound around the plurality of spokes 1090. Furthermore, in the motor 1002, the plurality of spokes 1090 can be loaded and unloaded relative to the yoke 1030, respectively. The yoke 1030 and the plurality of spokes 1090 are respectively formed by a plurality of magnetic bodies 1039 and 1049 stacked in the axial direction. The plurality of magnetic bodies 1049 forming the spokes 1090 are forced from the end face (upper end face 1034) side of one of the two end faces (upper end face 1034 and lower end face 1035) of the yoke 1030 toward the end face (lower end face 1035) side of the other end face.

[0111] According to such motor 1002, since the plurality of spokes 1090 (i.e., stator member 1041) can be attached to and detached from yoke 1030, coil 1050 can be wound around spoke 1090 before inserting spoke 1090 into yoke 1030. Therefore, coil 1050 can be wound with a high occupancy rate similarly to motor 1001, and motor 1002 is a motor in which coil is wound with a high occupancy rate.

[0112] Furthermore, according to the motor 1002, as described above, the plurality of magnetic bodies 1049 forming the spokes 1090 are urged from the end face (upper end face 1034) side of one of the two end faces (upper end face 1034 and lower end face 1035) of the yoke 1030 toward the end face (lower end face 1035) side of the other end face, so that, similar to the motor 1001, the magnetic flux generated by the coil 1050 in each of the plurality of magnetic bodies 1049 is not hindered by the boundary of a pair of magnetic bodies 1039, 1039 adjacent to each other in the axial direction among the plurality of magnetic bodies 1039 forming the yoke 1030, and can be transmitted to the plurality of magnetic bodies 1049. Therefore, according to the motor 1002, the deviation of the magnetic circuit can be suppressed, and, for example, high efficiency can be achieved.

[0113] In the above, the other motors of the present invention have been described by taking the above-mentioned embodiment as an example, but the present invention is not limited thereto.

[0114] For example, in the above embodiment, an example is described in which the plurality of magnetic bodies 1049 forming the spokes 1090 are forced from one side in the axial direction toward the other side, but the plurality of magnetic bodies 1049 may be forced from the other side in the axial direction toward one side.

[0115] Furthermore, as long as a force can be applied to the plurality of magnetic bodies 1049 forming the spokes 1090 from the end face side of one of the two end faces (upper end face 1034 and lower end face 1035) of the yoke 1030 toward the end face side of the other, the pressing member described in the above embodiment is not limited to the pressing members 1060 and 1160, and pressing members having other shapes and structures may also be used. Furthermore, it is also possible to apply a force to the plurality of magnetic bodies 1049 forming the spokes 1090 from the end face side of one of the two end faces (upper end face 1034 and lower end face 1035) of the yoke 1030 toward the end face side of the other without using a pressing member.

[0116] In addition, those skilled in the art can appropriately modify the motor of the present invention based on prior knowledge, and can also change the shapes, sizes, and combinations of various configurations. As long as the configuration of the present invention is still provided through such modification, it is naturally included in the scope of the present invention. Description of Reference Numerals

[0117] 100: motor; 112, 212: magnet; 113a: first bearing; 113b: second bearing; 114, 314, 414: cover; 115, 415: retainer; 115d, 415d: ​​accommodating portion; 116, 416: elastic member; 117a, 117b: pressing member; 118: protective member; 119: spacer; 120: coil; S: shaft; 1001, 1002: motor; 1030: yoke; 1031: opening; 1032: first inner surface : surface (inner surface); 1033: second inner surface (inner surface); 1034: upper end surface (end surface); 1035: lower end surface (end surface); 1036: outer periphery (side surface); 1037: inner periphery (side surface); 1039: magnetic body; 1040: stator; 1042: magnetic pole portion; 1046: outer hole portion (hole portion); 1047: inner hole portion (hole portion); 1049: magnetic body; 1050: coil; 1060, 1160: pressing member (member); 1090: spoke.

Claims

1. A motor, comprising: axis; magnet; Coil; a first bearing disposed on one end side of the shaft in the axial direction; a second bearing disposed on the other end side of the shaft in the axial direction; a cover fixed to the second bearing and arranged radially inside the coil; a retainer fixed to the first bearing; and an elastic member held by the holding frame, The elastic member is disposed between the cover and the retainer in the longitudinal direction of the shaft.

2. The motor according to claim 1, wherein: The magnet is arranged inside the cover in a radial direction.

3. The motor according to claim 1 or 2, wherein: The retainer has a receiving portion for receiving the elastic member.

4. The motor according to claim 1 or 2, wherein: The elastic member applies force to the retainer in the axial direction.

5. The motor according to claim 1 or 2, wherein: A pressing member is provided, the pressing member being arranged between the magnet and the first bearing and pressing the inner ring of the first bearing.

6. The motor according to claim 5, wherein: The pressing member is a balancer that adjusts the rotation balance of the shaft.

7. The motor according to claim 1 or 2, wherein: The cover covers the first bearing and the second bearing in a radial direction.

8. The motor according to claim 1 or 2, wherein: A protective member is provided which covers the outer side of the magnet in the radial direction.

9. The motor according to claim 1 or 2, wherein: The radial size of the magnet is larger than the radial size of the first bearing or the second bearing.

10. The motor according to claim 1 or 2, wherein: The cover is fixed to the second bearing via a spacer.

11. The motor according to claim 1, wherein: The elastic member is arranged on one end side of the shaft with respect to the first bearing in the axial direction.

12. The motor according to claim 11, wherein: The elastic member is located between the first bearing and one end portion of the shaft in the axial direction.

13. The motor according to claim 12, wherein: The elastic member is located at a position away from the first bearing by a predetermined distance toward one end of the shaft in the axial direction.

14. The motor according to claim 13, wherein: The elastic member is located between an end portion of one side of the cover and the retainer in the axial direction.

15. The motor according to claim 14, wherein: The radial size of the elastic member is larger than the radial size of the cover.

16. A motor, comprising: an annular yoke having two end surfaces in the axial direction; and The stator includes a plurality of magnetic poles, a plurality of spokes connected to the plurality of magnetic poles and the inner circumference of the annular yoke, and a plurality of coils wound around the plurality of spokes. The plurality of spokes can be respectively installed and removed relative to the annular yoke. The annular yoke and the plurality of spokes are respectively formed of a plurality of magnetic bodies stacked in the axial direction. The plurality of magnetic bodies forming the spokes are urged from one end surface side of the two end surfaces of the annular yoke toward the other end surface side.

17. The motor according to claim 16, wherein: The plurality of magnetic bodies forming the spokes are urged in a radial direction.

18. The motor according to claim 16 or 17, wherein: The annular yoke has a plurality of openings arranged along the circumferential direction. The plurality of openings each include an inner surface located on the one end surface side of the annular yoke and an inner surface located on the other end surface side of the annular yoke. The plurality of spokes extend radially and pass through the plurality of openings, The plurality of magnetic bodies forming the spokes are urged from an inner surface located on the one end surface side of the annular yoke toward an inner surface located on the other end surface side of the annular yoke.

19. The motor according to claim 18, wherein: The number of the plurality of magnetic bodies forming the spokes is smaller than the number of the plurality of magnetic bodies forming the plurality of openings among the plurality of magnetic bodies forming the annular yoke.

20. The motor according to claim 16 or 17, wherein: The plurality of spokes include a plurality of holes extending in the axial direction. The member inserted into the plurality of holes applies force to the plurality of magnetic bodies forming the spokes.

21. The motor according to claim 20, wherein: The plurality of holes are respectively adjacent to the annular yoke in the radial direction.

22. The motor according to claim 21, wherein The components are in contact with side surfaces of the annular yoke, respectively.

23. The motor according to claim 21, wherein The components each have a side surface that is inclined relative to a side surface of the annular yoke.

24. The motor according to claim 16 or 17, wherein: The thickness of each of the plurality of magnetic bodies forming the spoke in the axial direction is the same as the thickness of each of the plurality of magnetic bodies forming the annular yoke in the axial direction.

Images