Motor

Abstract

To improve roundness.SOLUTION: A motor includes a plurality of divided cores, two rings disposed on both sides of the plurality of divided cores in a rotation axis direction, and a plurality of columns connecting the two rings. The plurality of divided cores include a first divided core and a second divided core adjacent to the first divided core in a circumferential direction. The first split core includes a first side surface and a first coupling portion protruding from the first side surface in a circumferential direction. The plurality of columns extend in a rotation axis direction. The pillar is disposed between the first connection portion and a portion of the second split core in the circumferential direction.SELECTED DRAWING: Figure 7

Description

[Technical Field]

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

[0002] In a rotating electric machine such as a motor, a technique for assembling split cores to form an annular stator core is known. When assembling the split cores, a technique for forming fitting portions for interconnecting the core blocks at both ends of the yoke portion is known. Another known technique is to provide a circumferentially recessed recess 134a at one end of a pair of opposing core back portions 134, and a circumferentially protruding protrusion 134b at the other end that complementarily fits into the recess 134a. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-220288 [Patent Document 2] Japanese Patent Application Publication No. 2019-180214 Summary of the Invention [Problem to be solved by the invention]

[0004] When adjacent split cores are fitted together, the circularity of the stator may deteriorate due to insufficient positioning precision or joining strength.

[0005] In one aspect, an object is to provide a motor that can improve roundness. [Means for solving the problem]

[0006] In one aspect, the motor includes a plurality of split cores, two rings arranged on either side of the plurality of split cores in the rotation axis direction, and a plurality of pillars connecting the two rings. The plurality of split cores includes a first split core and a second split core adjacent to the first split core in the circumferential direction. The first split core has a first side surface and a first connecting portion protruding in the circumferential direction from the first side surface. The plurality of pillars extend in the rotation axis direction. The pillar is arranged in the circumferential direction between the first connecting portion and a portion of the second split core.

[0007] According to one aspect, the roundness can be improved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an example of a motor according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view showing an example of a motor according to an embodiment. [Figure 3] FIG. 3 is a cross-sectional view showing an example of a stator in the embodiment. [Figure 4] FIG. 4 is an enlarged perspective view showing an example of a stator in the embodiment. [Figure 5] FIG. 5 is a perspective view showing an example of a split core in the embodiment. [Figure 6] FIG. 6 is a side view showing an example of a split core in the embodiment. [Figure 7] FIG. 7 is an exploded perspective view showing an example of an assembly process of the rings and columns in the embodiment. [Figure 8] FIG. 8 is a cross-sectional view showing an example of a motor according to the first modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] An embodiment of a motor disclosed herein will be described in detail below with reference to the drawings. Note that the dimensional relationships and ratios of elements in the drawings may differ from reality. The dimensional relationships and ratios may also differ between the drawings. For ease of understanding, the drawings may illustrate a coordinate system in which the direction in which the teeth 120 of a split core 100 (described later) extend is the Y-axis direction, and the direction in which the inner circumferential portion 110 (described later) extends is the X-axis direction. In this case, the negative side of the X-axis is an example of one side in the circumferential direction, and the positive side of the X-axis is an example of the other side in the circumferential direction. Note that the same components are designated by the same reference numerals throughout the description of the embodiments.

[0010] [Embodiment] First, a motor according to an embodiment will be described with reference to Figs. 1 and 2. Fig. 1 is a perspective view showing an example of a motor according to an embodiment. Fig. 2 is an exploded perspective view showing an example of a motor according to an embodiment. As shown in Fig. 2, a motor 1 according to an embodiment includes a stator 2, a rotor 91, and a shaft 99. As shown in Fig. 2, the motor 1 according to an embodiment is a so-called inner rotor type motor in which the rotor 91 is disposed radially inward of the stator 2.

[0011] The shaft 99 is fixed to the center of the rotor 91 in the radial direction and rotates in conjunction with the rotor 91. One or both ends of the shaft 99 in the Z-axis direction protrude outward from the frame 90, as shown in FIG. 1. As shown in FIG. 2, the shaft 99 is rotatably supported by a flange 920 via a bearing 929. Furthermore, the shaft 99 is rotatably supported on the negative side of the Z-axis by a protruding portion 901 of the frame 90 shown in FIG. 1 via a bearing (not shown). The Z-axis direction along which the shaft 99 extends is an example of the rotation axis direction.

[0012] As shown in FIGS. 3 and 4 , the stator 2 includes a plurality of split cores 100 to 600 arranged in the circumferential direction, a plurality of coils 21 to 26, and insulators 31 and 32. FIG. 3 is a cross-sectional view showing an example of a stator according to an embodiment. FIG. 4 is an enlarged perspective view showing an example of a stator according to an embodiment. FIG. 3 shows a cross-section of the stator 2 taken along line AA in FIG. 1, and FIG. 4 shows a cross-section of the stator 2 taken along line BB in FIG. 1. In FIG. 3 , the frame 90, rotor 91, and shaft 99, other than the stator 2, are shown with dashed lines, and in FIG. 4 , the split core 600 of the stator 2 is not shown. The split core 100 is an example of a first split core, and the split core 200 is an example of a second split core.

[0013] The split cores 100 to 600 are formed by stacking multiple magnetic steel plates or the like in the Z-axis direction. As shown in FIGS. 5 and 6, the split cores 100 to 600 each have an inner peripheral portion 110, teeth 120, and a side surface 130. FIG. 5 is a perspective view showing an example of a split core according to the embodiment, and FIG. 6 is a side view showing an example of a split core according to the embodiment. The split cores 100 to 600 according to the embodiment each have portions that protrude in the circumferential direction on both the inner and outer radial sides. Note that the split cores 200 to 600 according to the embodiment each have substantially the same shape as the split core 100, and the description of the split core 100 also applies to the split cores 200 to 600 unless otherwise specified.

[0014] The divided cores 100 to 600 are arranged side by side in the circumferential direction as shown in Fig. 3. In the embodiment, the divided core 200 is arranged on one side in the circumferential direction of the divided core 100, for example, on the negative side along the X axis.

[0015] The insulators 31 and 32 are insulating members made of resin or the like that cover the split cores 100 to 600. As shown in FIG. 4 , the insulator 32 is attached to the split cores 100 to 600 from the negative side in the Z-axis direction. The insulator 31 is attached to the split cores 100 to 600 from the positive side in the Z-axis direction. For example, the same number of insulators 31 and 32 as the number of split cores 100 to 600 are provided, and the insulators 31 and 32 are arranged side by side in the circumferential direction so as to cover each of the split cores 100 to 600. The insulators 31 and 32 are sandwiched radially between the side surface 130 and inner peripheral portion 110 of the split core 100 (described later), and are also arranged so as to sandwich the teeth 120 (described later) from both sides in the circumferential direction.

[0016] The coils 21 to 26 are formed by winding a conductor (conductor wire) such as an insulating coated copper wire around the split cores 100 to 600 via the insulators 31 and 32. In the embodiment, the coils 21 to 26 are wound, for example, after the insulators 31 and 32 are attached to the split cores 100 to 600.

[0017] The stator 2 and the rotor 91 are housed in a frame 90 and a holder 910. The holder 910 and the flange 920 are formed with openings through which the terminals 931 to 933 are inserted, as shown in FIG.

[0018] Terminals 931 to 933 are electrically connected to one or more of coils 21 to 26. Terminals 931 to 933 protrude in the positive direction in the Z-axis direction as shown in Fig. 1 through openings formed in flange 920 and holder 910, and are electrically connected to an external device (not shown). Note that terminal 932 is not shown in Fig. 1 because it is hidden by shaft 99.

[0019] The teeth 120 of the split core 100 extend radially. In the embodiment, as shown in FIGS. 5 and 6 , the side surfaces 130 of the split core 100 extend in both circumferential directions from the radially outer sides of the teeth 120. As shown in FIG. 5 , the side surfaces 130 include an end surface 131 on the positive axial side, an end surface 132 on the negative axial side, a side end surface 134 as an end surface on one side in the circumferential direction, and a side end surface 135 as an end surface on the other side in the circumferential direction. Note that the side end surface 134 on one side is an example of an end surface on one side in the circumferential direction, and the side end surface 135 on the other side is an example of an end surface on the other side in the circumferential direction. In the embodiment, the distance from the circumferential center of the side surface 130 shown in FIG. 6 to the side end surface 134 on one side is substantially the same as the distance L12 from the circumferential center to the side end surface 135 on the other side.

[0020] 6, a first outer peripheral surface 133 located on one side in the circumferential direction and a second outer peripheral surface 164 located on the other side in the circumferential direction are formed on the radially outer side of the side surface 130. The second outer peripheral surface 164 is recessed radially inward from the first outer peripheral surface 133. The first outer peripheral surface 133 and the second outer peripheral surface 164 are connected by a surface 160 extending in the radial direction, as shown in FIG.

[0021] The split core 100 also has a connecting portion 140 that protrudes from the side surface 130 toward one side in the circumferential direction. As shown in Fig. 6, the connecting portion 140 protrudes from a side end surface 134 on one side in the circumferential direction of the side surface 130 toward one side in the circumferential direction, for example, toward the negative side of the X-axis shown in Fig. 5. The connecting portion 140 of the split core 100 is an example of a first connecting portion that protrudes from a side surface.

[0022] Similarly, the split core 200 circumferentially adjacent to the split core 100 has a side surface 230 and a connecting portion 240 that protrudes circumferentially from the side surface 230, as shown in Fig. 3. The split core 200 is located on one side in the circumferential direction relative to the split core 100, for example, on the negative side of the X-axis shown in Fig. 3. The side surface 230 of the split core 200 is an example of a second side surface, and the connecting portion 240 is an example of a second connecting portion that protrudes from the side surface.

[0023] As shown in Fig. 4, the connecting portion 140 of the split core 100 protrudes in the circumferential direction from the side surface 130 of the split core 100 toward the surface 260 of the split core 200. As shown in Fig. 4, the surface 260 is a surface that extends radially, for example, from the first outer peripheral surface 233 of the side surface 230 of the split core 200 toward the second outer peripheral surface 264. Similarly, the surface 160 of the split core 100 is a surface that extends radially, for example, from the first outer peripheral surface 143 of the side surface 130 of the split core 100 toward the second outer peripheral surface 164. The surface 260 is an example of a part of the second split core.

[0024] In addition, in the circumferential direction, the face 260 of the split core 200 is formed at a midpoint between the side faces 230. In this case, the connecting portion 140 of the split core 100 and the face 260 of the split core 200 are connected at a midpoint in the circumferential direction of the split core 200.

[0025] 4, a second recess 161 is formed in the surface 160 of the side surface 130 of the split core 100, and a second recess 261 is formed in the surface 260 of the side surface 230 of the split core 200. The second recesses 161 and 261 are portions recessed from the other side in the circumferential direction.

[0026] 4, an end 150 on one circumferential side of the connecting portion 140 of the split core 100 protrudes in the circumferential direction from a side end face 134 on one side of the side surface 130 of the split core 100 toward a surface 260 of the split core 200. The end 150 is an example of an end of a first connecting portion.

[0027] Further, a first recess 151 is formed in the end portion 150. The first recess 151 is a portion recessed from one side in the circumferential direction.

[0028] 5, the first recess 151 extends from one end face 131 of the side surface 130 in the rotation axis direction to the other end face 132. Similarly, the second recess 261 extends from one end face 231 of the side surface 230 in the rotation axis direction to the other end face 232, as shown in FIG.

[0029] 6, in the circumferential direction, the size L11 of the connecting portion 140 on the side surface 130 is, for example, 50% or more of the size L10 in the circumferential direction of the side surface 130. For example, the size L11 in the circumferential direction of the connecting portion 140 shown in FIG. 6 is approximately the same as the size L12 in the circumferential direction from the side end surface 135 on the other side of the side surface 130 in the circumferential direction to the second recess 161.

[0030] As shown in FIG. 6 , the thickness (radial size) T21 of the connecting portion 140 is approximately equal to the distance G22 (radial size of the surface 160) between the outer peripheral surface 143 of the connecting portion 140 and the second outer peripheral surface 164 of the side surface 130. Furthermore, the distance G11 (radial size of the side end surface 134 on one side) between the inner peripheral surface 146 of the connecting portion 140 and the inner peripheral surface 139 of the side surface 130 is approximately equal to the thickness T12 of the second outer peripheral surface 164 (radial size of the side end surface 135 on the other side). The outer peripheral surface 143 of the connecting portion 140 of the split core 100 is formed to be approximately flush with the first outer peripheral surface 133 of the side surface 130. Similarly, the outer peripheral surface 243 of the connecting portion 240 of the split core 200 is formed to be approximately flush with the first outer peripheral surface 233 of the side surface 230. The first outer peripheral surface 233 is an example of another part of the second side surface.

[0031] In this case, as shown in Fig. 7, the outer peripheral surface 143 of the connecting portion 140 of the split core 100 is adjacent to and substantially flush with the first outer peripheral surface 233, which is another part of the side surface 230 of the split core 200 shown in Fig. 3, thereby forming the outer peripheral surface of the stator 2. Fig. 7 is an exploded perspective view showing an example of the assembly process of the ring and the column in this embodiment. Also, as shown in Fig. 7, the second outer peripheral surface 264, which is part of the side surface 230 of the split core 200, contacts the inner peripheral surface 146 of the connecting portion 140 of the split core 100.

[0032] 2, the motor 1 in this embodiment includes two rings 710 and 720 and multiple pillars 810 to 860. The two rings 710 and 720 are disposed on both sides of the split core 100 and the split core 200 in the Z-axis direction. For example, the ring 710 is disposed on the positive side of the split core 100 and the split core 200 in the Z-axis direction, and the ring 720 is disposed on the negative side.

[0033] The multiple pillars 810 to 860 extend in the Z-axis direction and connect the two rings 710 and 720. The multiple pillars 810 to 860 are, for example, press-fit into through holes formed in the rings 710 and 720. Note that in this embodiment, the number of the multiple pillars 810 to 860 is the same as the number of slots, for example, the same as the number of divided cores 100 to 600. In this configuration, the multiple pillars 810 to 860 are positioned and arranged so as to be equally spaced from one another in the circumferential direction.

[0034] The plurality of pillars 810 to 860 are arranged between the connecting portions of the split cores and the adjacent split cores in the circumferential direction. For example, as shown in FIGS. 3 and 7 , the pillar 820 is arranged between the connecting portion 140 of the first split core 100 and the surface 260 of the second split core 200 in the circumferential direction. In this case, the pillar 820 is inserted into the stator 2 by being inserted between the first recess 151 and the second recess 261 that are opposed in the circumferential direction. The plurality of pillars 810 to 860 are press-fitted into, for example, the ring 720, and then inserted into the stator 2, and then press-fitted into the ring 710. Note that the pillars 810 to 860 are inserted into the stator 2 after, for example, the insulators 31 and 32 are attached to the split cores 100 to 600 and the coils 21 to 26 are wound therearound, but the embodiment is not limited to this. For example, the insulators 31 and 32 may be attached after the columns 810 to 860 are inserted into the divided cores 100 to 600 arranged in the circumferential direction.

[0035] According to this configuration, the split cores 100 to 600 are positioned by the multiple pillars 810 to 860, the circularity of which is ensured by the two rings 710 and 720, thereby improving the circularity of the stator 2. In addition, the pillars 810 to 860 fixed to the rings 710 and 720 prevent the split cores 100 to 600 from moving in the circumferential or radial directions.

[0036] As described above, the motor 1 in this embodiment includes a plurality of split cores 100 to 600, two rings 710, 720 arranged on both sides of the plurality of split cores in the rotation axis direction, and a plurality of pillars 810 to 860 connecting the two rings 710, 720. The plurality of split cores 100 to 600 includes a first split core 100 and a second split core 200 adjacent to the first split core 100 in the circumferential direction. The first split core 100 has a first side surface 130 and a first connecting portion 140 protruding circumferentially from the first side surface 130. The plurality of pillars 810 to 860 extend in the rotation axis direction. The pillars 810 to 860 are arranged circumferentially between the first connecting portion 140 and a portion 260 of the second split core 200. According to this configuration, the circularity of the stator 2 can be improved, and the plurality of split cores 100 to 600 can be firmly fastened together.

[0037] Moreover, the split core 100 in this embodiment includes spokes 120, magnetic pole portions 110, side surfaces 130, and connecting portions 140. The spokes 120 extend radially. The magnetic pole portions 110 extend in both circumferential directions from the spokes 120. The side surfaces 130 extend in both circumferential directions from the radially outer sides of the spokes 120. The connecting portions 140 protrude from one circumferential end of the side surfaces 130. A first recess 151 recessed from one circumferential end is formed at one circumferential end 150 of the connecting portion 140. A second recess 161 recessed from the other circumferential end is formed at the side surfaces 130. The first recess 151 and the second recess 161 extend from one end surface 131 of the side surfaces 130 to the other end surface 132 in the rotation axis direction. The teeth 120 are an example of a member having spokes and magnetic pole portions, and the inner circumferential portions 110 of the split cores 100 are an example of magnetic pole portions.

[0038] In addition, the size of the connecting portion 140 of the split core 100 on the side surface 130 in the circumferential direction may be 50% or more of the size of the side surface in the circumferential direction. In addition, the size of the connecting portion 140 in the circumferential direction may be approximately the same as the size of the side surface 130 from the other end 135 in the circumferential direction to the second recess 161.

[0039] [Variations] Although the configuration of the embodiment has been described above, the embodiment is not limited thereto. For example, as shown in Fig. 8, the connecting portion 140 of the split core 100 and the surface 260 of the split core 200 may be welded to each other on the radially outer side. Fig. 8 is a cross-sectional view showing an example of a motor according to a first modified example. Fig. 8 shows a cross-section of the motor A1 according to the first modified example taken along line AA in Fig. 1.

[0040] 8, the split core 100 and split core 200 in the first modified example are joined at the radially outer sides by a welded portion 872. The same applies to the other split cores 300 to 600. With this configuration, the split cores 100 to 600 can be joined more firmly.

[0041] Furthermore, the parts to be welded are not limited to parts 871 to 876 shown in Fig. 8. For example, the part where the inner circumferential surface 146 of the connecting portion 140 of the split core 100 shown in Fig. 4 comes into contact with the second outer circumferential surface 264 of the side surface 230 of the adjacent split core 200 may be welded at its end in the Z-axis direction. With this configuration, both ends of the stator 2 are welded in the Z-axis direction, so the split cores 100 to 600 can be connected more firmly.

[0042] Furthermore, the split core 100 may have a shape that does not include the inner peripheral portion 110 as a magnetic pole portion, and the insulators 31 and 32 may be formed in a substantially annular shape and cover the split cores 100 to 600 collectively. For example, after a pre-wound coil 21 is attached to a split core, the split core may be connected to another split core in the circumferential direction. The two rings 710 and 720 do not have to have the same shape, and may have different radii, axial thicknesses, etc.

[0043] Although the split cores 100 to 600 have been described as having substantially the same shape, the split cores may have different shapes. For example, one or more of the split cores may not have a connecting portion, or any of the split cores may have multiple connecting portions. Furthermore, the connecting portion 140 may be shaped to protrude toward the other circumferential side, for example, toward the positive side of the X axis in FIG. 6.

[0044] Furthermore, the motor is not limited to an inner rotor type, but may be a so-called outer rotor type in which the rotor is positioned radially outward from the stator.

[0045] While the present invention has been described above based on the embodiments and modifications, it goes without saying that the present invention is not limited to the embodiments and modifications, and various modifications are possible without departing from the spirit of the present invention. Such modifications without departing from the spirit of the present invention are also included in the technical scope of the present invention, and this will be clear to those skilled in the art from the description of the claims.

[0046] As explained in detail in the embodiments, the detailed description of the invention also describes inventions relating to the motor and split cores described below.

[0047] [Appendix 1] A plurality of split cores; two rings arranged on both sides of the plurality of split cores in the rotation axis direction; a plurality of pillars connecting the two rings; Equipped with the plurality of divided cores include a first divided core and a second divided core adjacent to the first divided core in the circumferential direction, the first split core has a first side surface and a first connecting portion protruding from the first side surface in a circumferential direction, the plurality of pillars extend in the direction of the rotation axis, The pillar is disposed between the first connecting portion and a part of the second divided core in the circumferential direction. Motor.

[0048] [Appendix 2] the second divided core is located on one side in the circumferential direction with respect to the first divided core, The motor according to claim 1, wherein the first connecting portion protrudes in the circumferential direction from an end of the first side surface toward a part of the second split core.

[0049] [Appendix 3] the second divided core includes a second side surface and a second connecting portion protruding from the second side surface in a circumferential direction, The motor described in Appendix 1 or 2, wherein the first connecting portion and a portion of the second split core are connected at a circumferentially intermediate position of the second side surface of the second split core.

[0050] [Appendix 4] The motor according to claim 3, wherein a portion of the second side surface of the second split core is in contact with an inner circumferential surface of the first connecting portion.

[0051] [Appendix 5] a stator having the plurality of split cores and a plurality of coils; an outer peripheral surface of the first connecting portion is adjacent to and substantially flush with another part of the second side surface, forming an outer peripheral surface of the stator; 5. The motor according to claim 3 or 4.

[0052] [Appendix 6] 6. The motor according to claim 1, wherein the first connecting portion and a part of the second divided core are welded to each other on the radially outer side.

[0053] [Appendix 7] radially extending spokes; magnetic pole portions extending in both circumferential directions from the spokes; Side surfaces extending in both circumferential directions from the radially outer sides of the spokes; a connecting portion protruding from one end portion in the circumferential direction to one side in the circumferential direction; Equipped with a first recess recessed from one side in the circumferential direction is formed at one end of the connecting portion in the circumferential direction, a second recessed portion recessed from the other side in the circumferential direction is formed on the side surface, the first recess and the second recess extend from one end surface of the side surface to the other end surface in the rotation axis direction; Split core.

[0054] [Appendix 8] 8. The split core according to claim 7, wherein the size of the connecting portion on the side surface in the circumferential direction is 50% or more of the size of the side surface in the circumferential direction.

[0055] [Appendix 9] The split core according to appendix 7 or 8, wherein the circumferential size of the connecting portion is approximately the same as the circumferential size from the other circumferential end of the side surface to the second recess. [Explanation of symbols]

[0056] 1, A1 motor, 2 stator, 21 to 26 coil, 31, 32 insulator, 90 frame, 91 rotor, 99 shaft, 100, 200, 300, 400, 500, 600 divided core, 110 inner peripheral portion (magnetic pole portion), 120 teeth, 130, 230 side surface, 131, 132 end surface, 133 first outer peripheral surface, 134, 135 side end surface, 139 inner peripheral surface, 140, 240 connecting portion, 143, 243 outer peripheral surface, 146 inner peripheral surface, 150 end portion, 151 first recess, 160, 260 surface, 161, 261 second recess, 164, 264 second outer peripheral surface, 710, 720 ring, 810 to 860 Pillars, 871-876 Welded parts, 910 Holders, 920 Flanges, 929 Bearings, 931-933 Terminals

Claims

1. A plurality of split cores; two rings arranged on both sides of the plurality of split cores in the rotation axis direction; a plurality of pillars connecting the two rings; Equipped with the plurality of divided cores include a first divided core and a second divided core adjacent to the first divided core in the circumferential direction, the first split core has a first side surface and a first connecting portion protruding in a circumferential direction from the first side surface, the plurality of pillars extend in the direction of the rotation axis, The pillar is disposed between the first connecting portion and a part of the second divided core in the circumferential direction. Motor.

2. the second divided core is located on one side in the circumferential direction with respect to the first divided core, The motor according to claim 1 , wherein the first connecting portion protrudes in the circumferential direction from an end of the first side surface toward a part of the second split core.

3. the second divided core includes a second side surface and a second connecting portion protruding from the second side surface in a circumferential direction, The motor according to claim 2 , wherein the first connecting portion and a part of the second split core are connected to each other at a circumferentially intermediate position of the second side surface of the second split core.

4. The motor according to claim 3 , wherein a portion of the second side surface of the second split core is in contact with an inner circumferential surface of the first connecting portion.

5. a stator having the plurality of split cores and a plurality of coils; an outer circumferential surface of the stator is formed adjacent to another part of the second side surface so as to be substantially flush with the outer circumferential surface of the stator; 5. The motor according to claim 3 or 4.

6. The motor according to claim 5 , wherein the first connecting portion and a portion of the second split core are welded to each other on radially outer sides.

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