Stator, motor, and manufacturing method for stator

Abstract

To provide a stator, motor, and manufacturing method for the stator that can improve the packing factor or the workability of the winding operation.SOLUTION: A stator 1 has a stator core 11 having a cylindrical core back portion 12 extending in the axial direction and a plurality of tooth portions 20 extending radially from the core back portion and arranged circumferentially, and coils 15 positioned on the plurality of tooth portions. Each tooth portion has a plurality of radially divided tooth portions 201 arranged radially. The coil has a winding portion 151 located in each of the multiple radially divided tooth portions.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stator, a motor, and a method for manufacturing a stator. [Background technology]

[0002] A stator for an inner rotor motor having a stator core and a coil is known. For example, Patent Document 1 discloses a rotating electric machine having a plurality of teeth extending in a tapered shape from a back yoke of the stator, a teeth flange formed on the inner peripheral end face of each of the teeth, and a coil formed by winding a coil wire in multiple layers around the face of each of the teeth. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2008-061368 Summary of the Invention [Problem to be solved by the invention]

[0004] In the winding work on the stator teeth as described above, the coil needs to be wound in the slots formed between adjacent teeth. This limits the number of turns of the coil that can be wound in the limited space of the slot, and also makes the workability of the coil winding work around the slots less good. Therefore, there is a need to improve the coil space factor as well as the workability of the winding work.

[0005] An object of the present invention is to provide a stator, a motor, and a method of manufacturing a stator that can improve the space factor or the workability of winding work. [Means for solving the problem]

[0006] A stator according to one embodiment of the present invention includes a stator core having a cylindrical core back portion extending in an axial direction and a plurality of teeth extending radially from the core back portion and arranged in a circumferential direction, and a coil positioned on the plurality of teeth. Each of the teeth has a plurality of radially divided teeth arranged in the radial direction. The coil has winding portions respectively positioned on the plurality of radially divided teeth.

[0007] A method for manufacturing a stator according to one embodiment of the present invention is a method for manufacturing a stator having a stator core including a cylindrical core back portion extending in an axial direction and a plurality of teeth extending radially from the core back portion and arranged circumferentially, and coils arranged on the plurality of teeth. The method for manufacturing the stator includes a winding unit forming step of winding the coils onto radially divided teeth portions constituting a part of the teeth to form a plurality of winding units, and an attachment step of attaching the radially divided teeth portions of the plurality of winding units to the radially inner side of the core back portion in a state where the radially divided teeth portions of the plurality of winding units are connected to each other. [Effects of the Invention]

[0008] According to one embodiment of the present invention, it is possible to provide a stator that can improve the space factor or the workability of the winding work. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a partial cross-sectional view showing a part of the schematic configuration of a stator according to a first exemplary embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing a schematic configuration of a stator according to a second exemplary embodiment of the present invention. [Figure 3] FIG. 3 is a partial cross-sectional view showing a part of the schematic configuration of a stator according to a second exemplary embodiment of the present invention. [Figure 4] FIG. 4 is a flowchart showing a method for manufacturing a stator. [Figure 5] FIG. 5 is a diagram illustrating a winding unit forming process for forming a plurality of winding units that constitute the teeth. [Figure 6] FIG. 6 is a diagram illustrating the process of connecting the winding units together. [Figure 7] FIG. 7 is a diagram illustrating the process of attaching the connected winding units to the core back portion. [Figure 8] FIG. 8 is a plan view showing a schematic configuration of a stator according to a modification of the second exemplary embodiment of the present invention. [Figure 9] FIG. 9 is a diagram showing a process of attaching the winding units connected by the connecting wire to a workpiece. [Figure 10] FIG. 10 is a diagram showing a process of attaching the winding unit to the workpiece. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals, and their description will not be repeated. Furthermore, the dimensions of the components in each drawing do not faithfully represent the actual dimensions of the components and the dimensional ratios of the components.

[0011] In the following description, the direction parallel to the axis P1 of the stator will be referred to as the "axial direction," the direction perpendicular to the axis P1 will be referred to as the "radial direction," and the direction along the arc centered on the central axis will be referred to as the "circumferential direction."

[0012] Furthermore, in the following description, expressions such as "coupled," "fixed," "connected," and "attached" (hereinafter referred to as "fixed") include not only cases where members are directly fixed to each other, but also cases where members are fixed via other members. In other words, in the following description, expressions such as "fixed" include both direct and indirect fixation of members to each other.

[0013] [Embodiment 1] Fig. 1 is a partial cross-sectional view showing a part of the schematic configuration of a stator 1 according to a first exemplary embodiment of the present invention. Fig. 1 is a view of a part of the stator 1 of a motor as viewed in the axial direction. Although not specifically shown, the motor has the stator 1 and a rotor that rotates relative to the stator 1 around an axis P1 of the stator 1.

[0014] Referring to FIG. 1, a stator 1 includes a stator core 11 and a coil 15.

[0015] The stator core 11 has a core back portion 12 and a plurality of teeth portions 20. The core back portion 12 and the plurality of teeth portions 20 are each made of, for example, laminated steel plates. As will be described in detail later, the teeth portion 20 and the core back portion 12 are divided. The teeth portion 20 is also divided into a plurality of radially divided teeth portions 201, 202.

[0016] The core back portion 12 has a cylindrical shape extending in the axial direction.

[0017] The plurality of teeth 20 extend radially inward RDI from the core back portion 12. The plurality of teeth 20 are arranged in the circumferential direction CD at intervals of a predetermined slot. Each of the teeth 20 has a plurality of radially divided teeth 201, 202 arranged in the radial direction RD.

[0018] The radially divided tooth portion 201 is connected at its radially outer end portion 2012 to the radially inner RDI side of the core back portion 12. The radially divided tooth portion 202 is located radially inner RDI than the radially divided tooth portion 201. The radially outer end portion 2022 of the radially divided tooth portion 202 is connected to the radially inner end portion 2011 of the radially divided tooth portion 201.

[0019] The coil 15 is located on the plurality of teeth 20. The coil 15 has winding portions 151 and 152 wound around the plurality of radially divided teeth 201 and 202, respectively.

[0020] The radially divided tooth portions 201, 202 are electrically insulated from the winding portions 151, 152 wound around the radially divided tooth portions 201, 202. For example, the coil 15 may have an insulating film on its surface. The tooth portion 20 may have an insulating layer on its surface. The stator 1 may have an insulating portion that electrically insulates the radially divided tooth portions 201, 202 from the winding portions 151, 152.

[0021] According to the above-described configuration, for example, the winding portions 151, 152 can be formed by winding a portion of the coil 15 individually around each of the multiple radially divided tooth portions 201, 202. This improves the workability of the winding work for the radially divided tooth portions 201, 202. Furthermore, even when rewinding the wire that constitutes the coil 15, the wire that constitutes the coil 15 can be rewinded only around the radially divided tooth portions 201, 202 that need to be rewinded. This improves the work efficiency of the winding work and also improves the space factor.

[0022] As a result, it is possible to provide a stator 1 that improves the space factor or workability of winding work. Furthermore, with the above-mentioned configuration, the stator 1 can be easily manufactured by assembling multiple radially divided tooth portions 201, 202. This improves the manufacturing efficiency of the motor.

[0023] [Embodiment 2] (Overall composition) Fig. 2 is a perspective view showing a schematic configuration of a stator 2 according to an exemplary embodiment 2 of the present invention. Fig. 3 is a partial cross-sectional view showing a part of the schematic configuration of a stator 2 according to an exemplary embodiment 2 of the present invention.

[0024] 2 and 3, stator 2 includes stator core 11, coil 15, and insulating portions 311 and 312. Stator core 11 includes core back portion 12 and a plurality of teeth 20. Teeth 20 includes radially divided teeth 201 and 202.

[0025] The radially divided tooth portion 201 has a tapered shape that is radially inward RDI from the radially outer end portion 2012. The radially divided tooth portion 201 has a connecting protrusion 511 and a connecting guide 512 as connecting portions.

[0026] The connecting protrusion 511 is located at the radially inner end 2011. The connecting protrusion 511 protrudes radially inward RDI from the end face of the radially inner end 2011. The connecting guide 512 is located at the radially outer end 2012.

[0027] The radially inner end 2021 of the radially divided tooth portion 202 protrudes in the circumferential direction CD beyond the side walls 2025, 2026 located at the ends of the circumferential direction CD. The portion of the radially divided tooth portion 202 that is radially outer RDO than the radially inner end 2021 has a tapered shape toward the radially inner RDI. The radially divided tooth portion 202 has a connecting recess 522 as a connecting portion. The connecting recess 522 is located at the radially outer end 2022. The connecting recess 522 is recessed from the end face of the radially outer RDO of the radially outer end 2022 toward the radially inner RDI.

[0028] The radially divided tooth portion 201 is connected to a connecting groove 121 located on the radially inner RDI side of the core back portion 12 by a connecting guide 512. The radially divided tooth portion 201 is connected to a connecting recess 522 of the radially divided tooth portion 202 by a connecting protrusion 511.

[0029] In this manner, the plurality of radially divided tooth portions 201, 202 are connected by the connecting protrusions 511 and the connecting recesses 522 which serve as connecting portions.

[0030] In the above-described configuration, the plurality of radially divided tooth portions 201, 202 are connected in the radial direction by connecting portions, thereby making it possible to prevent the radially divided tooth portions 201, 202 from shifting in position.

[0031] The insulating portions 311 and 312 electrically insulate the tooth portion 20 from a portion of the coil 15. The insulating portions 311 and 312 are made of, for example, an electrically insulating resin. The insulating portion 311 electrically insulates the radially divided tooth portion 201 from the winding portion 151 located in the radially divided tooth portion 201. The insulating portion 312 electrically insulates the radially divided tooth portion 202 from the winding portion 152 located in the radially divided tooth portion 202.

[0032] The insulating portion 311 has a covering portion 411 , a first flange portion 412 , and a second flange portion 413 .

[0033] The covering portion 411 is located between the radially divided tooth portion 201 and the winding portion 151. The first flange portion 412 is located at an outer end, which is one end in the radial direction RD, of the covering portion 411. The second flange portion 413 is located at an inner end, which is the other end in the radial direction RD of the covering portion 411.

[0034] The insulating portion 312 has a covering portion 421, a first flange portion 422, and a second flange portion 423. The covering portion 421 is located between the radially divided tooth portion 202 and the winding portion 152. The first flange portion 422 is located at an outer end, which is one end of the covering portion 421 in the radial direction RD. The second flange portion 423 is located at an inner end, which is the other end of the covering portion 421 in the radial direction RD.

[0035] In the above-described configuration, the radially divided tooth portion 201, the winding portion 151, and the insulating portion 311 form one winding unit U1. The radially divided tooth portion 202, the winding portion 152, and the insulating portion 312 form one winding unit U2. This makes it easy to perform winding work on the winding units U1 and U2 as a unit, thereby improving the workability of the winding work.

[0036] In the above-described configuration, radial movement of the winding can be restricted by the first flange portion 412 and the second flange portion 423 located at both ends in the radial direction RD of the covering portions 411, 421. This makes it possible to suppress misalignment of the winding.

[0037] Furthermore, winding portions 151 and 152 have a shape that tapers toward the radially inward RDI. For example, width W2 at the radial center of winding portion 152, which is located radially inward RDI from winding portion 151, is smaller than width W1 at the radial center of winding portion 151, which is located radially outward RDO from winding portion 152. Here, widths W1 and W2 are, for example, widths in a direction perpendicular to radial direction RD.

[0038] In the above-described configuration, the winding portions 151, 152 have a shape that tapers radially inward RDI, which prevents the winding portions 151, 152 from interfering with each other on adjacent teeth 20. This improves the workability of assembling the winding units U1, U2 including the winding portions 151, 152.

[0039] (Method of manufacturing a stator) Fig. 4 is a flowchart showing a method for manufacturing the stator 2. Fig. 5 is a diagram illustrating a winding unit forming process for forming the plurality of winding units U1, U2 that make up the teeth portion 20. Fig. 6 is a diagram illustrating a process for connecting the winding units U1, U2 to each other. Fig. 7 is a diagram illustrating a process for attaching the connected winding units to the core back portion 12.

[0040] 4 to 7, the method for manufacturing stator 2 includes a winding unit forming step S1 and an attachment step S2.

[0041] In the winding unit forming step S1, a plurality of winding units U1, U2 to be attached to the core back portion 12 are formed.

[0042] 5, first, the wire 45 is wound around the insulating portion 311 attached to the radially divided tooth portion 201. This forms a winding unit U1 including the radially divided tooth portion 201, the insulating portion 311, and the winding portion 151. Next, the wire 45 is wound around the insulating portion 312 attached to the radially divided tooth portion 202. This forms a winding unit U2 including the radially divided tooth portion 202, the insulating portion 312, and the winding portion 152.

[0043] In this manner, in the winding unit forming step S1, the wire 45 constituting the coil is wound around the radially divided tooth portions 201, 202 constituting a part of the tooth portion 20 to form the winding units U1, U2.

[0044] In the attachment step S2, the winding units U1, U2 are attached to the radially inner side of the core back portion 12 with the radially divided tooth portions 201, 202 of the winding units U1, U2 connected to each other.

[0045] 6, the connecting protrusions 511 of the radially divided tooth portion 201 are inserted into the connecting recesses 522 of the radially divided tooth portion 202, thereby connecting the winding units U1 and U2 in the extension direction ED of the tooth portion 20. This forms the tooth portion 20 having the winding units U1 and U2.

[0046] 7, the tooth portion 20 and the core back portion 12 are connected by moving the connection guides 512 of the radially divided tooth portions 201 included in the tooth portion 20 in the axial direction AD relative to the connection grooves 121 of the core back portion 12. By repeating the winding unit forming step S1 and the attachment step S2 for each of the multiple tooth portions 20, the stator 2 as shown in FIGS.

[0047] In the winding unit forming process S1 described above, the winding work for the insulating portion 311 attached to the radially divided tooth portion 201 and the winding work for the insulating portion 312 attached to the radially divided tooth portion 202 can be performed separately. Furthermore, even when rewinding the wire material 45 in the winding unit forming process S1, the wire material 45 can be rewinded only around the radially divided tooth portions 201, 202.

[0048] The above-described method for manufacturing the stator 2 improves the workability of the winding work and the work efficiency of the rewinding work.

[0049] [Modification of the second embodiment] (Overall composition) FIG. 8 is a plan view showing a schematic configuration of a stator 3 according to a modified example of the second exemplary embodiment of the present invention.

[0050] A stator 3 according to a modification of the exemplary embodiment 2 of the present invention differs from the stator 2 according to the embodiment 2 in that coils 16 of two different phases are wound around one tooth portion 20. In the following, the same components as those in the embodiment 2 are denoted by the same reference numerals and their description is omitted, and only the components that differ from the configuration of the embodiment 2 will be described.

[0051] 8 to 10, the stator 3 has a stator core 11, a coil 16, and a first insulating portion 61, a second insulating portion 62, a third insulating portion 63, a fourth insulating portion 64, a fifth insulating portion 65, and a sixth insulating portion 66. The stator core 11 has a core back portion 12 and a plurality of teeth portions 20.

[0052] The plurality of teeth 20 include a first teeth 21, a second teeth 22, and a third teeth 23.

[0053] The first teeth portion 21 has a radially divided teeth portion 211 connected to the core back portion 12 and a radially divided teeth portion 212 connected to the radially divided teeth portion 211.

[0054] The second teeth portion 22 is located adjacent to one side CDA in the circumferential direction CD of the first teeth portion 21. The second teeth portion 22 has a radially divided teeth portion 221 connected to the core back portion 12 and a radially divided teeth portion 222 connected to the radially divided teeth portion 221.

[0055] The third teeth portion 23 is located adjacent to the other side CDB in the circumferential direction CD of the first teeth portion 21. The third teeth portion 23 has a radially divided teeth portion 231 connected to the core back portion 12 and a radially divided teeth portion 232 connected to the radially divided teeth portion 231.

[0056] The coil 16 has a first winding portion 161, a second winding portion 162, a third winding portion 163, a fourth winding portion 164, a fifth winding portion 165, a sixth winding portion 166, and connecting wires 171 and 172.

[0057] The first winding portion 161 is located in the radially divided tooth portion 211 of the first teeth portion 21. The second winding portion 162 is located in the radially divided tooth portion 222 of the second teeth portion 22. The third winding portion 163 is located in the radially divided tooth portion 221 of the second teeth portion 22. The fourth winding portion 164 is located in the radially divided tooth portion 231 of the third teeth portion 23. The fifth winding portion 165 is located in the radially divided tooth portion 212 of the first teeth portion 21. The sixth winding portion 166 is located in the radially divided tooth portion 232 of the third teeth portion 23.

[0058] The connecting wire 171 electrically connects the first winding portion 161 and the second winding portion 162. More specifically, the connecting wire 171 electrically connects one end of the winding wound around the first winding portion 161 to one end of the winding wound around the second winding portion 162. Although not shown in detail, the other end of the first winding portion 161 and the other end of the second winding portion 162 are electrically connected to a U-phase terminal of the motor. The connecting wire 172 electrically connects one end of the winding of the fifth winding portion 165 to one end of the winding of the fourth winding portion 164. Although not shown in detail, the other end of the winding of the fifth winding portion 165 and the other end of the winding of the fourth winding portion 164 are electrically connected to a W-phase terminal of the motor.

[0059] The third teeth portion 23 has a radially divided teeth portion 231 of the winding unit U24 connected to the radially inner side of the core back portion 12, and a radially divided teeth portion 232 of the winding unit U26 connected to the radially inner RDI side of the winding unit U24.

[0060] The radially divided tooth portion 211, the first insulating portion 61, and the first winding portion 161 form the winding unit U21. The radially divided tooth portion 212, the fifth insulating portion 65, and the fifth winding portion 165 form the winding unit U25. The radially divided tooth portion 221, the third insulating portion 63, and the third winding portion 163 form the winding unit U23. The radially divided tooth portion 222, the second insulating portion 62, and the second winding portion 162 form the winding unit U22. The radially divided tooth portion 231, the fourth insulating portion 64, and the fourth winding portion 164 form the winding unit U24. The radially divided tooth portion 232, the sixth insulating portion 66, and the sixth winding portion 166 form the winding unit U26.

[0061] In the above-described configuration, the winding portion 161 of the first tooth portion 21 and the winding portion 162 of the second tooth portion 22, which are two circumferentially adjacent teeth, are electrically connected by a connecting wire 171. As a result, coils of the same phase are positioned across the circumferentially adjacent first tooth portion 21 and second tooth portion 22. This reduces noise and vibrations that occur when the motor rotates.

[0062] The first winding portion 161 and the second winding portion 162 form a part of the U-phase coil. The third winding portion 163 forms a part of the V-phase coil. The fourth winding portion 164 and the fifth winding portion 165 form a part of the W-phase coil.

[0063] In this way, coils of different phases are wound around one tooth portion 20. This reduces noise and vibration that occurs when the phase is switched during motor rotation, making it possible to provide a stator 3 that can improve motor characteristics.

[0064] The first insulating portion 61 electrically insulates the radially divided tooth portions 211 of the first tooth portion 21 from the first winding portion 161. The first insulating portion 61 has a covering portion 611, a first flange portion 612, a second flange portion 613, and a guide portion 614.

[0065] The covering portion 611 is located between the radially divided tooth portion 211 of the first tooth portion 21 and the first winding portion 161.

[0066] The first flange portion 612 is located at an outer end, which is one end of the covering portion 611 in the radial direction RD.

[0067] The second flange portion 613 is located at the inner end, which is the other end of the covering portion 611 in the radial direction RD.

[0068] The guide portion 614 is located on the first flange portion 612 and guides the connecting wire 171 relative to the guide portion 624 of the second insulating portion 62 .

[0069] The second insulating portion 62 electrically insulates the radially divided tooth portions 222 of the second tooth portion 22 from the second winding portion 162. The second insulating portion 62 has a covering portion 621, a first flange portion 622, a second flange portion 623, and a guide portion 624.

[0070] The covering portion 621 is located between the radially divided tooth portion 222 of the second tooth portion 22 and the second winding portion 162.

[0071] The first flange portion 622 is located at the outer end of the covering portion 621 in the radial direction RD.

[0072] The second flange portion 623 is located at the inner end of the covering portion 621 in the radial direction RD.

[0073] The guide portion 624 is located on the first flange portion 622 and guides the connecting wire 171 to the guide portion 614 of the first insulating portion 61 .

[0074] The guide portion 614 of the first insulating portion 61 and the guide portion 624 of the second insulating portion 62 have, for example, a hook shape.

[0075] The third insulating portion 63 and the fourth insulating portion 64 have the same configuration as the first insulating portion 61. The fifth insulating portion 65 and the sixth insulating portion 66 have the same configuration as the second insulating portion 62. For example, the fifth insulating portion 65 has a guide portion 654.

[0076] In the above-described configuration, the connecting wire 171 electrically connecting the first winding portion 161 and the second winding portion 162 of two adjacent teeth can be guided by the guide portion 614 of the first insulating portion 61 and the guide portion 624 of the second insulating portion 62. This makes it possible to further prevent the connecting wire 171 from shifting.

[0077] (Method of manufacturing a stator) Fig. 9 is a diagram showing a process of attaching the winding units U21 and U22 connected by the connecting wire 171 to the workpiece WK1. Fig. 10 is a diagram showing a process of attaching the winding unit U25 to the workpiece WK2.

[0078] 9 and 10 in addition to FIG. 8, a manufacturing method of the stator 2 will be described. First, as a premise, as shown in FIG. 9, in the workpiece WK1, no winding unit is connected to the coupling position R1, where the first teeth portion 21 of the winding unit U21 is connected to the core back portion 12, and the coupling position R1 is empty. The winding unit U23 is attached to the coupling position R2, which is adjacent to the CDA end of the circumferential direction CD relative to the coupling position R1. The third teeth portion 23, which has the winding units U24 and U26, is attached to the coupling position R3, which is adjacent to the CDB end of the circumferential direction CD relative to the coupling position R1. In other words, the winding unit U24 is attached to the coupling position R3. The coupling wire 172 extending from the end of the winding portion 164 is not connected to the other winding portions.

[0079] To the workpiece WK1 as described above, winding units U21 and U22 are attached, which are electrically connected to each other by a connecting wire 171. As shown by the outline arrow in Figure 9, winding unit U21 is attached to connecting position R1, and winding unit U22 is attached to the radially inward RDI side of winding unit U23.

[0080] As a result, as shown in FIG. 10, the second teeth portion 22 is formed by the radially divided teeth portion 221 and the radially divided teeth portion 222 that are connected to each other.

[0081] Next, winding unit U25 is attached to winding unit U21 radially inward RDI as shown by the hollow arrow in Fig. 10. Furthermore, winding units U24 and U25 are electrically connected to each other by coupling wire 172 while being guided by guide portion 654 of fifth insulating portion 65 as shown in Fig. 8.

[0082] In this manner, the stator 3 shown in Fig. 8 is obtained. By attaching the winding units U21 and U22, which are electrically connected to each other by the connecting wire 171 in advance, to the workpiece WK1 in this manner, the time and effort required to connect the connecting wire 171 after attaching the winding units U21 and U22 is eliminated.

[0083] [Other embodiments] Although the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiments, and it is possible to appropriately modify the above-described embodiments within the scope of the spirit of the present invention.

[0084] In each of the above embodiments, the stators 1, 2, and 3 are for use in an inner rotor motor. However, the stators may also be used in an outer rotor motor. That is, the stator may have a cylindrical core and a plurality of teeth extending radially outward from the core and arranged circumferentially. Note that the term "cylindrical stator" should be broadly interpreted and includes a stator with a hollow interior and a cylindrical stator with a solid interior. The cylindrical stator may have a through-hole that penetrates in the axial direction.

[0085] In each of the above-described embodiments, the core back portion 12 is cylindrical. However, it may be cylindrical and have a polygonal shape such as a triangular or rectangular shape when viewed in the axial direction.

[0086] In each of the above-described embodiments, each of the plurality of teeth 20 is divided into two in the radial direction RD, but the teeth may be divided into three or more in the radial direction.

[0087] Although not specifically described in the above embodiments, a stator core having a core back portion and multiple teeth portions connected together may be formed, and then the core back portion and the teeth portions may be separated, and each tooth portion may be separated into multiple portions to form radially divided tooth portions. Instead of forming a stator core having a core back portion and multiple teeth portions connected together, the core back portion and multiple teeth portions may be formed separately in advance. Furthermore, multiple radially divided tooth portions that make up one tooth portion may be formed separately in advance.

[0088] In the second embodiment, the radially divided tooth portion 201 located on the radially outer side RDO has a connecting protrusion 511. The radially divided tooth portion 202 located on the radially inner side RDI has a connecting recess 522. However, the radially divided tooth portion located on the radially outer side may also have the connecting recess. Or, the radially divided tooth portion located on the radially inner side may have the connecting protrusion. Or, the connecting portion may be formed by a connecting structure other than the connecting recess and connecting protrusion.

[0089] In the second embodiment, width W2 of winding portion 152 at the radial center is smaller than width W1 of winding portion 151 at the radial center. However, the position for comparing the widths does not have to be the radial center. Furthermore, the winding portion may be configured so that the shape of the winding portion located further radially inward becomes smaller in stages. Furthermore, the winding portion may be configured so that the number of turns of the winding portion located further radially inward is smaller.

[0090] In the second embodiment, the teeth 20 are tapered radially inward (RDI) except for both radial ends. However, the teeth may have a shape in which the circumferential width decreases stepwise. Furthermore, depending on the shape of the teeth, the covering portion of the insulating portion may also have a shape in which the circumferential width decreases stepwise.

[0091] In the second embodiment, the coupled winding units U1 and U2 are coupled to the core back portion 12. However, one of the two winding units may be coupled to the core back portion first, and then the other of the two winding units may be coupled to the one of the winding units.

[0092] In a modification of the second embodiment, the guide portion 614 of the first insulating portion 61 is located on the first flange portion 612. Furthermore, the guide portion 624 of the second insulating portion 62 is located on the first flange portion 622. However, the guide portions of the first insulating portion and the second insulating portion may each be located on the second flange portion. Furthermore, the guide portions of the first insulating portion and the second insulating portion may each be located on both the first flange portion and the second flange portion.

[0093] In a modification of the second embodiment, the first insulating portion 61 and the second insulating portion 62 each include a covering portion 611, 621, a first flange portion 612, 622, a second flange portion 613, 623, and a guide portion 614, 624. However, in the first insulating portion and the second insulating portion, at least one of the first flange portion, the second flange portion, and the guide portion may be omitted. Also, either the first insulating portion or the second insulating portion may be omitted.

[0094] In a modification of the second embodiment, the guide portion 614 of the first insulating portion 61 and the guide portion 624 of the second insulating portion 62 have, for example, a hook shape. However, the guide portion may be configured by a notch located in the first flange portion or the second flange portion.

[0095] In a modification of the second embodiment, coils 16 of two different phases are wound around one tooth portion 20 that is divided into two. However, coils of two different phases may also be wound around one tooth portion that is divided into three or more portions. For example, the tooth portion may have four radially divided tooth portions arranged in the radial direction. Of the four radially divided tooth portions, a first-phase coil may be wound around two radially outer divided tooth portions, and a first-phase coil may be wound around two radially inner divided tooth portions. Furthermore, coils of three different phases may also be wound around one tooth portion that is divided into three or more portions.

[0096] In a modification of the second embodiment, winding units U21 and U22 are attached to the workpiece WK1 and are electrically connected to each other by a connecting wire 171. However, the two winding units may be attached to the workpiece and then electrically connected to each other by a connecting wire.

[0097] [Configuration example] The present technology can also be configured as follows.

[0098] (1) A stator including a stator core having a cylindrical core back portion extending in an axial direction and a plurality of teeth extending radially from the core back portion and arranged in a circumferential direction, and a coil positioned on the plurality of teeth. Each of the teeth has a plurality of radially divided teeth arranged in the radial direction. The coil has winding portions positioned on each of the plurality of radially divided teeth.

[0099] (2) The stator according to (1) further includes an insulating portion that electrically insulates the radially divided tooth portion from the winding portion located at the radially divided tooth portion.

[0100] (3) In the stator described in (2), the insulating portion has a covering portion located between the radially divided tooth portion and the winding portion, a first flange portion located at one radial end of the covering portion, and a second flange portion located at the other radial end of the covering portion.

[0101] (4) In the stator described in (1), the plurality of teeth include first teeth and second teeth circumferentially adjacent to the first teeth, and the coil has a first winding portion located at the radially divided teeth portion of the first teeth, a second winding portion located at the radially divided teeth portion of the second teeth, and a connecting wire electrically connecting the first winding portion and the second winding portion.

[0102] (5) The stator according to (4) includes a first insulating portion that electrically insulates the radially divided tooth portions of the first tooth portion from the first winding portion. The first insulating portion includes a covering portion located between the radially divided tooth portions of the first tooth portion and the first winding portion, a first flange portion located at one radial end of the covering portion, a second flange portion located at the other radial end of the covering portion, and a guide portion located on at least one of the first flange portion or the second flange portion and that guides the connecting wire.

[0103] (6) The stator according to (5) further includes a second insulating portion that electrically insulates the radially divided tooth portions of the second teeth portion from the second winding portion. The second insulating portion includes a covering portion located between the radially divided tooth portions of the second teeth portion and the second winding portion, a first flange portion located at one radial end of the covering portion, a second flange portion located at the other radial end of the covering portion, and a guide portion located on at least one of the first flange portion and the second flange portion and that guides the connecting wire.

[0104] (7) In the stator described in any one of (1) to (6), each of the plurality of teeth extends radially inward, and the winding portion has a shape that tapers radially inward.

[0105] (8) In the stator described in any one of (1) to (7), the winding portions located on the plurality of radially divided tooth portions in the tooth portion are configured by the coils of different phases.

[0106] (9) In the stator described in any one of (1) to (8), each of the plurality of radially divided tooth portions has a connecting portion that radially connects the radially adjacent radially divided tooth portions.

[0107] (10) A motor includes the stator according to any one of (1) to (9) and a rotor that rotates relative to the stator about the axis of the stator.

[0108] (11) A method for manufacturing a stator having a stator core including a cylindrical core back portion extending in the axial direction and a plurality of teeth extending radially from the core back portion and aligned circumferentially, and coils arranged on the plurality of teeth, the method comprising: a winding unit forming step of winding the coils onto radially divided teeth portions constituting a part of the teeth to form a plurality of winding units; and an attachment step of attaching the radially divided teeth portions of the plurality of winding units to the radially inner side of the core back portion in a state where the radially divided teeth portions of the plurality of winding units are connected to each other. [Industrial Applicability]

[0109] The present invention is applicable to a stator, a motor having the stator, and a method for manufacturing a stator. [Explanation of symbols]

[0110] 1, 2, 3 Stator 11 Stator core 12 Core back part 15, 16 coils 20 Teeth 21 First teeth 22 Second teeth 23 Third Teeth 45 Wire rod 61 First insulation section 62 Second insulating section 63 Third insulation section 64 4th insulation section 65 5th Insulation Section 66 6th Insulation Section 121 Connection groove 151, 152 Winding section 161 First winding section 162 Second winding section 163 Third winding section 164 4th winding section 165 5th winding section 166 6th winding section 171, 172 connecting lines 201, 202, 211, 212, 221, 222, 231, 232 Radial split teeth 311, 312 Insulation section 411, 421, 611, 621 Covering part 412, 422, 612, 622 First flange part 413, 423, 613, 623 Second flange 511 Connecting protrusion 512 Connection Guide 522 Connection recess 614, 624, 654 Information Department 2011, 2021 Radial inner end 2012, 2022 Radial outer end 2025, 2026 side wall AD Axial direction CD circumferential direction ED stretching direction P1 axis R1 connection position R2 connection position R3 connection position RD radial direction RDI Radial Inward RDO radially outward U1, U2, U21, U22, U23, U24, U25, U26, U31 Winding units WK1, WK2 Work

Claims

1. a stator core having a cylindrical core back portion extending in an axial direction and a plurality of teeth portions extending in a radial direction from the core back portion and arranged in a circumferential direction; coils positioned at the plurality of teeth portions; A stator having Each of the teeth has a plurality of radially divided teeth arranged in the radial direction, The coil has winding portions located on the plurality of radially divided tooth portions, Stator.

2. 2. The stator according to claim 1, The rotor further includes an insulating portion that electrically insulates the radially divided tooth portion from the winding portion located at the radially divided tooth portion. Stator.

3. 3. The stator according to claim 2, The insulating portion is a covering portion located between the radially divided tooth portion and the winding portion; a first flange portion located at one end of the covering portion in the radial direction; a second flange portion located at the other end of the covering portion in the radial direction; having Stator.

4. 2. The stator according to claim 1, The plurality of teeth portions include a first teeth portion; a second teeth portion adjacent to the first teeth portion in a circumferential direction; Including, The coil is a first winding portion located at the radially divided tooth portion of the first tooth portion; a second winding portion located at the radially divided tooth portion of the second tooth portion; a connecting wire electrically connecting the first winding portion and the second winding portion; having Stator.

5. 5. The stator according to claim 4, a first insulating portion that electrically insulates the radially divided tooth portion of the first tooth portion from the first winding portion; The first insulating portion is a covering portion located between the radially divided tooth portion of the first tooth portion and the first winding portion; a first flange portion located at one end of the covering portion in the radial direction; a second flange portion located at the other end of the covering portion in the radial direction; a guide portion located on at least one of the first flange portion and the second flange portion and configured to guide the connecting wire; having Stator.

6. 6. The stator according to claim 5, a second insulating portion that electrically insulates the radially divided tooth portion of the second tooth portion from the second winding portion, The second insulating portion is a covering portion located between the radially divided tooth portion of the second tooth portion and the second winding portion; a first flange portion located at one end of the covering portion in the radial direction; a second flange portion located at the other end of the covering portion in the radial direction; a guide portion located on at least one of the first flange portion and the second flange portion and configured to guide the connecting wire; having Stator.

7. 2. The stator according to claim 1, Each of the plurality of teeth extends radially inward, The winding portion has a shape tapered toward the inside in the radial direction. Stator.

8. 2. The stator according to claim 1, The winding portions located on the plurality of radially divided tooth portions of the tooth portion are configured by the coils of different phases. Stator.

9. 2. The stator according to claim 1, Each of the plurality of radially divided tooth portions has a connecting portion that connects radially adjacent radially divided tooth portions. Stator.

10. A stator according to any one of claims 1 to 9; a rotor that rotates relative to the stator about an axis of the stator; A motor having

11. a stator core having a cylindrical core back portion extending in an axial direction and a plurality of teeth portions extending in a radial direction from the core back portion and arranged in a circumferential direction; a coil disposed on the plurality of teeth; A method for manufacturing a stator having a winding unit forming step of winding the coil around a radially divided tooth portion that constitutes a part of the tooth portion to form a plurality of winding units; an attachment step of attaching the plurality of winding units to the radially inner side of the core back portion in a state in which the radially divided tooth portions of the plurality of winding units are connected to each other; A method for manufacturing a stator having the above structure.

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