Rotating electric machines

Abstract

A rotating electric machine that can be made thinner is provided. [Solution] In a rotating electric machine, a plurality of stator coils 22 are electrically connected by a crossover wire 55. The crossover wire 55 has an inner conductor portion 552 arranged inside the stator 2, a coil connection conductor portion 551 drawn from the stator coil 22 and connected to the inner conductor portion 552, and an external lead conductor portion 553 drawn from the inner conductor portion 552 to the outside of the stator 2. At least one wire holding member 5 is attached to the stator 2 and arranged inside the stator 2 to avoid the rotor. The inner conductor portion 552 is arranged inside the stator 2 while being held to a base portion 51 by a holding portion 52 of the wire holding member 5. The coil connection conductor portion 551 and the external lead conductor portion 553 are passed between two adjacent stator coils 22 among the plurality of stator coils 22.

Description

[Technical Field]

[0001] The present disclosure relates to a rotating electric machine. [Background technology]

[0002] Patent Document 1 discloses an inner rotor type electric motor in which a rotor is disposed inside a stator. Multiple coils in the stator are electrically connected to each other by connection wiring. The stator is provided with a positioning member that positions the connection wiring. The positioning member is inclined outward in the axial direction of the stator as it approaches the center of the radially inner side of the stator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-129847 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional electric motor disclosed in Patent Document 1, the positioning members that position the connection wires protrude from the stator to the outside in the axial direction of the stator, which increases the axial dimension of the electric motor.

[0005] For example, in a machine-room-less elevator, which does not have a machine room, an elevator traction machine needs to be installed in the gap between the inner wall surface of the elevator shaft and the car. Therefore, electric motors incorporated in elevator traction machines are required to be thin. However, the conventional electric motor disclosed in Patent Document 1 increases the axial dimension of the electric motor, making it impossible to achieve a thin electric motor.

[0006] The present disclosure is intended to solve the above-mentioned problems, and has an object to provide a rotating electric machine that can be made thinner. [Means for solving the problem]

[0007] A rotating electric machine according to the present disclosure includes an annular stator, a rotor disposed inside the stator and rotatable relative to the stator around the axis of the stator, and at least one wire holding member disposed inside the stator avoiding the rotor and attached to the stator, the wire holding member being made of an electrically insulating material, the stator having a stator core and a plurality of coil assemblies provided on the stator core in a lined-up state in the circumferential direction of the stator, each coil assembly having a stator coil and a bobbin interposed between the stator coil and the stator core, The stator coils are electrically connected by jumper wires, which have an inner conductor portion arranged inside the stator, a coil connection conductor portion drawn out from the stator coil and connected to the inner conductor portion, and an external lead-out conductor portion drawn out from the inner conductor portion to the outside of the stator.The conductor holding member has a base portion attached to the bobbin and a holding portion provided on the base portion, and the inner conductor portion is arranged inside the stator while being held by the holding portion on the base portion, and the coil connection conductor portion and the external lead-out conductor portion are passed between two adjacent coil assembly components. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to reduce the thickness of a rotating electric machine. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing a rotating electric machine according to a first embodiment. [Figure 2] FIG. 2 is a partial cross-sectional view showing a part of the rotating electric machine of FIG. 1. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] 4 is a perspective view showing a bobbin part of the bobbin of FIG. 3. FIG. [Figure 5] FIG. 2 is a perspective view showing the conductor holding member of FIG. [Figure 6]FIG. 6 is a front view showing the conductor holding member of FIG. 5. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. [Figure 8] 2 is a perspective view of a main part showing a state in which crossover wires connected to each stator coil of FIG. 1 are disposed on the stator. FIG. [Figure 9] FIG. 9 is a front view showing the stator of FIG. 8. [Figure 10] FIG. 10 is a cross-sectional view taken along line XX in FIG. 9. [Figure 11] FIG. 10 is a cross-sectional view taken along line XI-XI in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] The following describes embodiments of the subject matter of the present disclosure with reference to the accompanying drawings. In each drawing, identical or corresponding parts are designated by the same reference numerals, and redundant explanations are appropriately simplified or omitted. Note that the subject matter of the present disclosure is not limited to the following embodiments, and any component of the embodiments may be modified or omitted within the scope of the gist of the present disclosure.

[0011] Embodiment 1 FIG. 1 is a perspective view showing a rotating electric machine according to a first embodiment. FIG. 2 is a partial cross-sectional view showing a part of the rotating electric machine of FIG. 1. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. In the figure, the rotating electric machine has a housing 1, a stator 2, a main shaft 3, a rotor 4, and a plurality of wire holding members 5. In FIGS. 1 and 2, a part of the housing 1 is not shown. In addition, in FIGS. 2 and 3, for simplicity, the wire holding members 5 are not shown.

[0012] As shown in Fig. 3, the housing 1 has a case portion 11 and a frame portion 12. The case portion 11 and the frame portion 12 are combined in a state where they face each other in a direction along the axis of the housing 1. This forms a space inside the housing 1. The stator 2, the rotor 4, and each conductor holding member 5 are housed inside the housing 1. A through-hole 13 is provided in the center of the frame portion 12, penetrating the frame portion 12 along the axis of the housing 1.

[0013] The stator 2 is fixed to the housing 1. As shown in FIG. 2, the shape of the stator 2 is annular with an axis. The axis of the stator 2 coincides with the axis of the housing 1. The stator 2 has a stator core 21 and a plurality of coil assemblies 20.

[0014] The stator core 21 is fixed to the housing 1. As shown in FIG. 2 , the shape of the stator core 21 is annular and extends along the circumferential direction of the stator 2. The circumferential direction of the stator 2 is the direction along the circumference of a circle centered on the axis of the stator 2. The stator core 21 is made of a magnetic material such as iron. The stator core 21 has a yoke portion 211 and a plurality of teeth 212.

[0015] The shape of the yoke portion 211 is annular along the circumferential direction of the stator 2. In this embodiment, the yoke portion 211 is made up of a plurality of unit yoke portions 211a. The plurality of unit yoke portions 211a are connected in a continuous annular shape along the circumferential direction of the stator 2.

[0016] A plurality of teeth 212 are provided on the yoke portion 211. Each tooth 212 protrudes from the inner periphery of the yoke portion 211 toward the inside in the radial direction of the stator 2. The radial direction of the stator 2 is the direction along the radius of a circle whose center is the axis of the stator 2.

[0017] The plurality of teeth 212 are arranged at intervals in the circumferential direction of the stator 2. In the present embodiment, the plurality of teeth 212 are arranged at equal intervals in the circumferential direction of the stator 2. Furthermore, in the present embodiment, one tooth 212 is provided for each unit yoke portion 211a. In the present embodiment, the stator core 21 has 18 teeth 212 and 18 unit yoke portions 211a. In the present embodiment, the stator core 21 is formed by connecting a plurality of core blocks 21a formed by the teeth 212 and the unit yoke portions 211a in a continuous annular shape in the circumferential direction of the stator 2.

[0018] The multiple coil assemblies 20 are provided on the stator core 21 in a lined-up state in the circumferential direction of the stator 2. The multiple coil assemblies 20 are provided on the multiple tooth portions 212, respectively. Therefore, the multiple coil assemblies 20 are arranged at intervals from one another in the circumferential direction of the stator 2. In this embodiment, the number of coil assemblies 20 provided on the stator core 21 is 18.

[0019] Each coil assembly 20 has a stator coil 22 and a bobbin 23. The stator coil 22 is formed by a conductive wire wound around the teeth 212.

[0020] The bobbin 23 is interposed between the stator coil 22 and the stator core 21. The bobbin 23 is provided on the tooth portion 212. The bobbin 23 also surrounds the tooth portion 212. The bobbin 23 is made of an insulating material that has electrical insulation properties. The material that makes up the bobbin 23 is resin or the like. In this way, the bobbin 23 ensures electrical insulation between the stator coil 22 and the stator core 21.

[0021] 3, one bobbin 23 is formed by combining a pair of bobbin parts 23a with the teeth 212 sandwiched therebetween. The pair of bobbin parts 23a are fitted onto the teeth 212 from both outer sides of the teeth 212 in the direction along the axis of the stator 2.

[0022] As shown in FIGS. 2 and 3, the bobbin 23 has a winding drum portion 231, an inner circumferential side restricting portion 232, and an outer circumferential side restricting portion 233.

[0023] The winding drum 231 has a cylindrical shape that surrounds the tooth portion 212. The winding drum 231 is interposed between the tooth portion 212 and the stator coil 22.

[0024] The inner circumferential side restricting portion 232 is provided at the inner end of the winding drum portion 231 in the radial direction of the stator 2. When the bobbin 23 is viewed from the radial inside of the stator 2, the inner circumferential side restricting portion 232 protrudes outward from the winding drum portion 231. The inner circumferential side restricting portion 232 is interposed between the tip end of the tooth portion 212 and the stator coil 22.

[0025] The outer circumferential regulating portion 233 is provided at the outer end of the winding drum portion 231 in the radial direction of the stator 2. When the bobbin 23 is viewed from the radial outside of the stator 2, the outer circumferential regulating portion 233 protrudes outward from the winding drum portion 231. The outer circumferential regulating portion 233 is interposed between the yoke portion 211 and the stator coil 22.

[0026] The conducting wire of the stator coil 22 is wound around the teeth 212 via the winding drum 231. As a result, the stator coil 22 is disposed between the inner circumferential side restricting portion 232 and the outer circumferential side restricting portion 233 of the bobbin 23.

[0027] The axis of the main shaft 3 coincides with the axis of the stator 2. As shown in FIG. 3 , the main shaft 3 is supported by the housing 1 via a plurality of bearings 14 provided in each of the case portion 11 and the frame portion 12. This allows the main shaft 3 to rotate relative to the housing 1 and the stator 2 around the axis of the stator 2. The main shaft 3 passes through a through hole 13 in the frame portion 12. This allows one end of the main shaft 3 to be located inside the housing 1, and the other end of the main shaft 3 to be located outside the housing 1.

[0028] The rotor 4 is fixed to the main shaft 3. The rotor 4 is disposed inside the stator 2. A gap is formed between the outer periphery of the rotor 4 and the inner periphery of the stator 2. This allows the rotor 4 to rotate integrally with the main shaft 3 around the axis of the stator 2 relative to the housing 1 and the stator 2.

[0029] As shown in FIG. 3 , the rotor 4 has a rotor core 41 and a plurality of permanent magnets 42. The rotor core 41 is made of a magnetic material such as iron. The rotor core 41 is fixed to the main shaft 3. In this embodiment, the rotor core 41 and the main shaft 3 are made of the same material. The rotor core 41 has a cylindrical shape. The axis of the rotor core 41 coincides with the axis of the stator 2.

[0030] Rotor core 41 is provided with an annular recess 43 centered on the axis of stator 2. Recess 43 is provided on each of both end faces of rotor core 41 in the direction along the axis of rotor core 41. The depth direction of each recess 43 coincides with the direction along the axis of stator 2.

[0031] A plurality of permanent magnets 42 are provided on the rotor core 41. In this embodiment, the plurality of permanent magnets 42 are fixed to the outer circumferential surface of the rotor core 41 at intervals from one another in the circumferential direction of the rotor 4. As a result, a plurality of magnetic poles are formed on the outer periphery of the rotor 4.

[0032] The multiple stator coils 22 are electrically connected by multiple crossover wires, which will be described later. For simplicity, the crossover wires are not shown in FIG. 1 . Three-phase current is passed through the multiple stators 2. A rotating magnetic field is generated in the stator 2 by the current passing through the multiple stator coils 22. The generated rotating magnetic field causes the rotor 4 to rotate integrally with the main shaft 3 relative to the housing 1 and the stator 2. Therefore, in this embodiment, a rotating electric machine is used as an electric motor.

[0033] As shown in Fig. 1, a plurality of conductor holding members 5 are attached to the stator 2. In this embodiment, five conductor holding members 5 are attached to the stator 2. The plurality of conductor holding members 5 are lined up in the circumferential direction of the stator 2.

[0034] Each conductor holding member 5 is disposed inside the stator 2, avoiding the rotor 4. Each conductor holding member 5 is spaced apart from the rotor 4 in the direction along the axis of the stator 2. This allows the rotor 4 to rotate relative to the stator 2 without interfering with each conductor holding member 5. Furthermore, each conductor holding member 5 is disposed within the range of the stator 2 in the direction along the axis of the stator 2.

[0035] Each conductor holding member 5 is attached to at least one of the plurality of bobbins 23. In this embodiment, one conductor holding member 5 is attached to three bobbins 23. In this embodiment, the conductor holding member 5 is attached to the inner circumferential side restricting portion 232 of the bobbin 23.

[0036] When each wire holding member 5 is attached to the stator 2, the inner end of the wire holding member 5 in the radial direction of the stator 2 becomes the inner edge of the wire holding member 5, and the outer end of the wire holding member 5 in the radial direction of the stator 2 becomes the outer edge of the wire holding member 5.

[0037] 3. In each bobbin 23, an insertion hole 234 for attaching the conductor holding member 5 is provided in the inner circumferential restricting portion 232. In each bobbin 23, the insertion hole 234 penetrates the inner circumferential restricting portion 232 along the radial direction of the stator 2. In each bobbin 23, the dimension of the inner circumferential restricting portion 232 in the radial direction of the stator 2 is larger than the dimension of the outer circumferential restricting portion 233 in the radial direction of the stator 2.

[0038] In each bobbin 23, a pair of claw spaces 235 are provided in the insertion hole 234. The pair of claw spaces 235 protrude from the insertion hole 234 to opposite sides in a direction intersecting the extension direction of the insertion hole 234. In this embodiment, the pair of claw spaces 235 protrude from the insertion hole 234 to opposite sides in the circumferential direction of the stator 2. Also, in this embodiment, of both end portions of the insertion hole 234 along the radial direction of the stator 2, the pair of claw spaces 235 are provided at the end portion closer to the stator coil 22. As a result, in this embodiment, a T-shaped hole is provided in the inner circumference side restricting portion 232 of each bobbin 23 by the insertion hole 234 and the pair of claw spaces 235.

[0039] In each bobbin 23, a pair of chamfered portions 232a inclined in opposite directions is formed on both ends of the inner circumferential side restricting portion 232 in the circumferential direction of the stator 2. As a result, the dimension of the bobbin 23 in the circumferential direction of the stator 2 continuously narrows toward the outside of the bobbin 23 at the positions where the pair of chamfered portions 232a are formed. Therefore, the gap between two inner circumferential side restricting portions 232 adjacent to each other in the circumferential direction of the stator 2 is wider at the positions where the chamfered portions 232a are formed than at positions where the chamfered portions 232a are not formed.

[0040] FIG. 5 is a perspective view of the conductor holding member 5 of FIG. 1. FIG. 6 is a front view of the conductor holding member 5 of FIG. 5. FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 6. The conductor holding member 5 is made of an insulating material having electrical insulation properties. Resin or the like is used as a material for forming the conductor holding member 5. The conductor holding member 5 has a base portion 51, a plurality of holding portions 52, a plurality of protrusions 53, and an overhang portion 54.

[0041] The dimension of the base portion 51 in the circumferential direction of the stator 2 continuously decreases from the outer edge toward the inner edge of the conductor holding member 5. As a result, when the base portion 51 is viewed along the axis of the stator 2, the shape of the base portion 51 is a sector excluding the center portion, as shown in FIG.

[0042] The base portion 51 has a first base plate 511 , a second base plate 512 , and a step forming plate 513 .

[0043] An outer edge portion of the conductor holding member 5 is formed on the first base plate 511. An inner edge portion of the conductor holding member 5 is formed on the second base plate 512. Therefore, when the conductor holding member 5 is attached to the stator 2, the second base plate 512 is located radially inward of the stator 2 relative to the first base plate 511.

[0044] The thickness directions of the first base plate 511 and the second base plate 512 coincide with the direction along the axis of the stator 2. As shown in FIGS. 5 and 7, the second base plate 512 is positioned at a position offset from the first base plate 511 in the direction along the axis of the stator 2. The second base plate 512 is connected to the first base plate 511 via a step-forming plate 513.

[0045] The second base plate 512 is formed with a second base top plate surface 512a and a second base back plate surface 512b. The second base top plate surface 512a and the second base back plate surface 512b face opposite sides in the thickness direction of the second base plate 512. The second base plate 512 is arranged with the second base top plate surface 512a facing the side where the first base plate 511 is misaligned with respect to the second base plate 512.

[0046] 6, the step forming plate 513 is disposed along the circumferential direction of the stator 2. As a result, a step along the circumferential direction of the stator 2 is formed between the first base plate 511 and the second base plate 512 by the step forming plate 513.

[0047] The plurality of holding portions 52 are provided on a second base plate 512 of the base portion 51. A plurality of wiring paths are set on the second base plate 512 along the circumferential direction of the stator 2. The holding portions 52 are arranged on each of the wiring paths.

[0048] In this embodiment, three wiring paths are set on the second base plate 512 at intervals from one another in the radial direction of the stator 2, and three holding portions 52 are arranged on each wiring path at intervals from one another. Therefore, in this embodiment, nine holding portions 52 are provided on the second base plate 512.

[0049] Each holding portion 52 is provided on the second base front plate surface 512a of the second base plate 512. As a result, each holding portion 52 is arranged within the range of the dimension of the step formed between the first base plate 511 and the second base plate 512 in the direction along the axis of the stator 2, as shown in FIG.

[0050] Each holding portion 52 holds a part of a later-described crossover wire connected to the plurality of stator coils 22 on the base portion 51. Each holding portion 52 has a pair of side walls 521 and a protruding piece 522.

[0051] The pair of side walls 521 are fixed to the second base plate 512. The pair of side walls 521 face each other in the radial direction of the stator 2 with the wiring path interposed therebetween.

[0052] The protruding piece 522 is provided on the upper end of one of the pair of side walls 521. The protruding piece 522 protrudes from one side wall 521 toward the other side wall 521. As a result, the protruding piece 522 covers the space existing between the pair of side walls 521. The protruding piece 522 is elastically deformable.

[0053] 5 and 6, the plurality of protrusions 53 are provided on the base portion 51. Each of the protrusions 53 protrudes from an outer edge portion formed on the first base plate 511 toward the outside in the radial direction of the stator 2.

[0054] The multiple protrusions 53 are arranged at intervals from one another in the circumferential direction of the stator 2. The intervals between the multiple protrusions 53 in the circumferential direction of the stator 2 correspond to the intervals between the multiple bobbins 23 in the circumferential direction of the stator 2. Each protrusion 53 can be inserted into an insertion hole 234 provided in the bobbin 23. The base portion 51 is attached to the bobbin 23 with each protrusion 53 inserted into the insertion hole 234.

[0055] In this embodiment, three protrusions 53 are provided on one base portion 51. In this embodiment, two of the three protrusions 53 are anti-removal protrusions 53a, and the remaining protrusion 53 is a positioning protrusion 53b. The positioning protrusion 53b is located between the two anti-removal protrusions 53a in the circumferential direction of the stator 2.

[0056] Each of the anti-removal projections 53a has a claw portion 531 at its tip. The claw portion 531 protrudes from the anti-removal projection 53a in a direction intersecting the direction in which the anti-removal projection 53a protrudes from the base portion 51. In this embodiment, the claw portions 531 protrude from each of the two anti-removal projections 53a in directions that move away from each other in the circumferential direction of the stator 2.

[0057] Each anti-detachment projection 53a is elastically deformable. When the anti-detachment projection 53a is inserted into the insertion hole 234, the claw portion 531 contacts the inner surface of the insertion hole 234, causing the anti-detachment projection 53a to elastically deform. When the anti-detachment projection 53a is completely inserted into the insertion hole 234, the claw portion 531 enters the claw space 235, causing the anti-detachment projection 53a to recover from its original elastic deformation. By entering the claw space 235, the claw portion 531 engages with the inner circumferential restriction portion 232 of the bobbin 23. When the anti-detachment projection 53a is inserted into the insertion hole 234, the claw portion 531 engages with the bobbin 23, preventing the anti-detachment projection 53a from coming out of the insertion hole 234. In other words, each anti-detachment projection 53a has a snap-fit ​​structure. Furthermore, when the anti-detachment projection 53a is inserted into the insertion hole 234, the claw portion 531 enters one of the pair of claw spaces 235. This prevents a part of the retaining projection 53a from coming out of the insertion hole 234, and prevents the arrangement space for the stator coil 22 from becoming narrow.

[0058] The positioning protrusions 53b are not provided with the claw portions 531. The positioning protrusions 53b are inserted into the insertion holes 234 to position the conductor holding member 5 relative to the stator 2.

[0059] In each wire holding member 5, the protruding portion 54 protrudes from the base portion 51 in the circumferential direction of the stator 2. In this embodiment, the protruding portion 54 protrudes from the second base plate 512. The protruding portion 54 is also arranged along the radial direction of the stator 2.

[0060] The thickness of the protruding portion 54 in the direction along the axis of the stator 2 is smaller than the thickness of the second base plate 512 in the direction along the axis of the stator 2. As a result, at the boundary between the second base plate 512 and the protruding portion 54, as shown in FIG. 5, a step is located where the protruding portion 54 is offset from the second base front plate surface 512a of the second base plate 512.

[0061] In each wire holding member 5, a recess 515 is provided in the base portion 51. The depth direction of the recess 515 coincides with the direction along the axis of the stator 2. The recess 515 is provided at one of both end portions of the base portion 51 in the circumferential direction of the stator 2, the other end portion being opposite the end portion at which the protrusion 54 is provided. In this embodiment, the recess 515 is provided in the second base back plate surface 512b of the second base plate 512 along the radial direction of the stator 2.

[0062] 1, the base portions 51 of the plurality of wire holding members 5 are lined up in the circumferential direction of the stator 2. Of two base portions 51 adjacent to each other in the circumferential direction of the stator 2, a protruding portion 54 protruding from one base portion 51 is fitted into a recessed portion 515 provided in the other base portion 51. In this embodiment, five base portions 51 are lined up consecutively in the circumferential direction of the stator 2, and the two base portions 51 located at both ends of the row of five consecutive base portions 51 are located at positions spaced apart from each other.

[0063] Fig. 8 is a perspective view of a main part showing a state in which crossover wires connected to each stator coil 22 in Fig. 1 are arranged in a stator 2. Fig. 9 is a front view showing the stator 2 in Fig. 8. Fig. 10 is a cross-sectional view taken along line XX in Fig. 9. Fig. 11 is a cross-sectional view taken along line XI-XI in Fig. 9.

[0064] In each wire holding member 5, one base portion 51 is attached to three bobbins 23 that are lined up consecutively in the circumferential direction of the stator 2. In this embodiment, five wire holding members 5 are lined up in the circumferential direction of the stator 2, and therefore five wire holding members 5 are sequentially attached to 15 bobbins 23 that are lined up consecutively in the circumferential direction of the stator 2.

[0065] When each wire holding member 5 is viewed along the axis of the stator 2, as shown in Fig. 9, a portion of the base portion 51 of each wire holding member 5 overlaps the area of ​​the rotor 4. In this embodiment, when each wire holding member 5 is viewed along the axis of the stator 2, the portions of each base portion 51 other than the outer edge portion overlap the area of ​​the rotor 4. As a result, when each wire holding member 5 is viewed along the axis of the stator 2, each holding portion 52 of each wire holding member 5 is located within the area of ​​the rotor 4.

[0066] 10 , in each wire holding member 5, the base portion 51 is arranged with the second base back plate surface 512b facing the rotor 4. As a result, the second base plate 512 is located closer to the center of the rotor 4 than the first base plate 511 in the direction along the axis of the stator 2. Furthermore, in each wire holding member 5, the base portion 51 is arranged with the second base front plate surface 512a, on which the holding portions 52 are provided, facing away from the rotor 4. As a result, in each wire holding member 5, the holding portions 52 are arranged on the side farther from the rotor 4 than the second base plate 512. In this embodiment, the second base plate 512 and the holding portions 52 are located inside a recess 43 provided in the rotor 4.

[0067] Of the two base portions 51 adjacent to each other in the circumferential direction of the stator 2, the protruding portion 54 protruding from one base portion 51 overlaps the other base portion 51 in the direction along the axis of the stator 2, as shown in Fig. 11. This makes it difficult for the base portion 51 of each wire holding member 5 to bend in the direction along the axis of the stator 2. Furthermore, of the two base portions 51 adjacent to each other in the circumferential direction of the stator 2, the protruding portion 54 protruding from one base portion 51 fits into a recessed portion 515 provided in the other base portion 51. The two base portions 51 adjacent to each other in the circumferential direction of the stator 2 are connected to each other by fitting the protruding portion 54 into the recessed portion 515.

[0068] The multiple stator coils 22 are electrically connected by multiple crossover wires 55. Each crossover wire 55 corresponds to a phase of the three-phase current supplied to the multiple stator coils 22. Each crossover wire 55 is connected to multiple stator coils 22 of the same phase as the corresponding phase. In this embodiment, three crossover wires 55 corresponding to each phase of the three-phase current are connected to the multiple stator coils 22.

[0069] As shown in FIGS. 8 and 9, each crossover wire 55 has a plurality of coil-connecting conductor portions 551, an inner circumferential conductor portion 552, and an externally drawn conductor portion 553.

[0070] Inner conductor portion 552 is disposed inside stator 2. Inner conductor portion 552 is disposed along the circumferential direction of stator 2.

[0071] In each wire holding member 5, an inner conductor portion 552 of each crossover wire 55 is arranged in a respective wiring path set in the base portion 51. In each wire holding member 5, the inner conductor portion 552 is held to the base portion 51 by each holding portion 52 located in the wiring path where the inner conductor portion 552 is arranged. As a result, when each crossover wire 55 is viewed along the axis of the stator 2, the inner conductor portion 552 of each crossover wire 55 is located within the area of ​​the rotor 4, as shown in FIG. 9. In addition, the inner conductor portion 552 of each crossover wire 55 is located inside a recess 43 formed in the rotor 4, as shown in FIG. 10. The inner conductor portion 552 is arranged inside the stator 2 while being held to the base portion 51 by each holding portion 52. Each wire holding member 5 holds each crossover wire 55 by holding the inner conductor portion 552 to the base portion 51 by each holding portion 52. This ensures electrical insulation between each crossover wire 55 and the rotor 4.

[0072] 10 , in each holding part 52, inner conductor part 552 is passed between a pair of side walls 521. In each holding part 52, protruding piece 522 prevents inner conductor part 552 from coming out from between the pair of side walls 521. In this embodiment, inner conductor part 552 is inserted between the pair of side walls 521 by pushing inner conductor part 552 between the pair of side walls 521 while elastically deforming protruding piece 522 from above holding part 52.

[0073] As shown in FIG. 9 , in each crossover wire 55, a plurality of coil connection conductor portions 551 drawn from each stator coil 22 of the same phase are connected to an inner conductor portion 552 of the same phase. That is, each coil connection conductor portion 551 connected to a plurality of stator coils 22 of the same phase is drawn from each stator coil 22 and connected to an inner conductor portion 552 of the same phase. Each coil connection conductor portion 551 passes between two adjacent coil assemblies 20 to reach the inner conductor portion 552. Therefore, each coil connection conductor portion 551 passes between two adjacent stator coils 22 and between two adjacent inner conductor portion 232 to reach the inner conductor portion 552. The coil connection conductor portion 551 between two adjacent inner conductor portion 232 passes between the chamfered portions 232a formed on each of the two inner conductor portion 232.

[0074] In each crossover wire 55, an external lead conductor portion 553, which is electrically connected to a power source (not shown) arranged outside the rotating electric machine, is connected to an inner conductor portion 552 of the same phase. The external lead conductor portion 553 is led out from the inner conductor portion 552 to the outside of the stator 2. The external lead conductor portion 553 passes from the inner conductor portion 552 between two adjacent coil assemblies 20 to reach the outside of the stator 2. As a result, the external lead conductor portion 553 passes from the inner conductor portion 552 between two adjacent inner circumferential side restricting portions 232, two adjacent stator coils 22, and two adjacent outer circumferential side restricting portions 233, in this order, to reach the outside of the stator 2. The external lead conductor portion 553 between two adjacent inner circumferential side restricting portions 232 passes between the chamfered portions 232a formed on the two inner circumferential side restricting portions 232. As a result, each crossover wire 55 is arranged so as not to protrude outside the stator 2 in the direction along the axis of the stator 2.

[0075] Next, the operation of the rotating electric machine will be described. When a three-phase current is supplied to the multiple stator coils 22 from a power source located outside the rotating electric machine through each of the crossover wires 55, a rotating magnetic field is generated in the stator 2. This causes the rotor 4 to rotate integrally with the main shaft 3 relative to the housing 1 and stator 2. At this time, each of the crossover wires 55 remains held by each of the conductor holding members 5, preventing the crossover wires 55 from coming into contact with the rotating rotor 4.

[0076] In such a rotating electric machine, a wire holding member 5 attached to the stator 2 is arranged inside the stator 2 to avoid the rotor 4. A crossover wire 55 electrically connecting a plurality of stator coils 22 has a coil connection conductor portion 551, an inner circumferential conductor portion 552, and an external lead-out conductor portion 553. The inner circumferential conductor portion 552 is arranged inside the stator 2 while being held on the base portion 51 by the holding portion 52 of the wire holding member 5. The coil connection conductor portion 551 is drawn out from the stator coil 22 and connected to the inner circumferential conductor portion 552. The external lead-out conductor portion 553 is drawn out from the inner circumferential conductor portion 552 to the outside of the stator 2. The coil connection conductor portion 551 and the external lead-out conductor portion 553 are passed between two adjacent coil assemblies 20.

[0077] This makes it possible to avoid arranging the coil connection conductor portion 551, the inner circumferential conductor portion 552, and the external lead conductor portion 553 on the outside of the stator 2 in the direction along the axis of the stator 2. This makes it possible to prevent the crossover wire 55 from protruding outside the stator 2 in the direction along the axis of the stator 2. This makes it possible to reduce the dimensions of the rotating electric machine in the direction along the axis of the stator 2, thereby making it possible to make the rotating electric machine thinner.

[0078] Furthermore, the rotor 4 is provided with an annular recess 43 centered on the axis of the stator 2. The depth direction of the recess 43 coincides with the direction along the axis of the stator 2. The retaining portion 52 is disposed inside the recess 43. This allows the retaining portion 52 to be disposed within the range of the rotor 4 in the direction along the axis of the stator 2. This more reliably prevents the crossover wire 55 from being disposed outside the stator 2 in the direction along the axis of the stator 2, and more reliably reduces the thickness of the rotating electric machine.

[0079] The conductor holding member 5 also has a plurality of protrusions 53 provided on the base portion 51. Each bobbin 23 to which the base portion 51 is attached has insertion holes 234 into which the plurality of protrusions 53 can be inserted. Therefore, by inserting each protrusion 53 into the insertion holes 234 of each bobbin 23, the base portion 51 can be easily attached to the bobbin 23. Furthermore, by inserting each protrusion 53 into each insertion hole 234, the positioning of the base portion 51 relative to the bobbin 23 can also be easily determined.

[0080] Furthermore, some of the protrusions 53 provided on one base portion 51 are anti-detachment protrusions 53a. A claw portion 531 is provided at the tip of the anti-detachment protrusion 53a. When the anti-detachment protrusion 53a is inserted into the insertion hole 234, the claw portion 531 engages with the bobbin 23, thereby preventing the anti-detachment protrusion 53a from coming off the insertion hole 234. This makes it possible to more reliably prevent the base portion 51 from coming off the bobbin 23.

[0081] Furthermore, a pair of claw spaces 235 are provided in the insertion hole 234. The pair of claw spaces 235 protrude from the insertion hole 234 to opposite sides in a direction intersecting the direction in which the insertion hole 234 extends. When the anti-detachment projection 53a is inserted into the insertion hole 234, the claw portion 531 is in one of the pair of claw spaces 235. Therefore, when the anti-detachment projection 53a is fitted in the insertion hole 234, the claw portion 531 can be hooked on the bobbin 23, and it is possible to prevent a portion of the anti-detachment projection 53a from protruding from the insertion hole 234. This makes it possible to prevent the arrangement space for the stator coil 22 from becoming narrow.

[0082] Each wire holding member 5 has a protruding portion 54 that protrudes from the base portion 51 in the circumferential direction of the stator 2. Of two base portions 51 that are adjacent to each other in the circumferential direction of the stator 2, the protruding portion 54 that protrudes from one base portion 51 overlaps the other base portion 51 in the direction along the axis of the stator 2. This makes it possible to make each base portion 51 less likely to bend in the direction along the axis of the stator 2. This makes it possible to prevent problems such as each wire holding member 5 coming into contact with the rotor 4, thereby improving the reliability of the rotating electric machine.

[0083] Furthermore, of two base portions 51 adjacent to each other in the circumferential direction of the stator 2, a protruding portion 54 protruding from one base portion 51 fits into a recessed portion 515 provided in the other base portion 51. This allows the two adjacent base portions 51 to be connected to each other, making it possible to more reliably prevent each conductor holding member 5 from bending. Furthermore, fitting the protruding portion 54 into the recessed portion 515 makes it less likely that a step will be formed at the boundary between the two adjacent base portions 51. This allows the inner conductor portion 552 of the crossover wire 55 to be held in the base portion 51 by the holding portion 52 without significantly bending the inner conductor portion 552 at the boundary between the two adjacent base portions 51. This makes it possible to facilitate the wiring work of the crossover wire 55.

[0084] In the above embodiment, each holding portion 52 is disposed inside a recess 43 formed in the rotor 4. However, if the conductor holding member 5 is disposed inside the stator 2 and avoids the rotor 4, each holding portion 52 does not have to be disposed inside the recess 43. In this case, the conductor holding member 5 is disposed within the range of the stator 2 in the direction along the axis of the stator 2. Also, in this case, the base portion 51 may be a flat plate and disposed perpendicular to the direction along the axis of the stator 2. Furthermore, if each holding portion 52 is not disposed inside the recess 43, the rotor 4 may not have a recess 43.

[0085] Furthermore, in the above embodiment, five conductor holding members 5 are attached to the stator 2. However, the number of conductor holding members 5 attached to the stator 2 is not limited to this. Therefore, the number of conductor holding members 5 attached to the stator 2 may be a number other than five, or may be one. In other words, it is sufficient that at least one conductor holding member 5 is attached to the stator 2.

[0086] In the above embodiment, the number of holders 52 that hold one inner conductor portion 552 on one base portion 51 is three. However, this is not limiting. The number of holders 52 that hold one inner conductor portion 552 on one base portion 51 may be one, two, four or more.

[0087] In the above embodiment, the protruding piece 522 of each holding portion 52 protrudes from one side wall 521 toward the other side wall 521, and is not connected to the other side wall 521. However, the protruding piece 522 of each holding portion 52 may be connected to each of the pair of side walls 521. Even in this configuration, the inner conductor portion 552 can be passed through the open portion of the space surrounded by the pair of side walls 521 and the protruding piece 522 and between the pair of side walls 521. This allows the holding portion 52 to hold the inner conductor portion 552 to the base portion 51. Furthermore, as long as the inner conductor portion 552 can be held between the pair of side walls 521, each holding portion 52 does not need to have the protruding piece 522.

[0088] In the above embodiment, one base portion 51 is attached to three bobbins 23. However, the number of bobbins 23 to which one base portion 51 is attached may be one, two, or four or more. That is, it is sufficient that the base portion 51 is attached to at least one of the plurality of bobbins 23.

[0089] Furthermore, in the above embodiment, the number of protrusions 53 provided on one base portion 51 is three. However, the number of protrusions 53 provided on one base portion 51 is not limited to this. Therefore, the number of protrusions 53 provided on one base portion 51 may be a number other than three, or may be one. In this case, an insertion hole 234 is provided in the inner circumferential side restricting portion 232 of each bobbin 23 to align with the position of each protrusion 53 in the circumferential direction of the stator 2. This also makes it possible to easily attach the base portion 51 to the bobbin 23 and to easily position the conductor holding member 5 relative to the stator 2.

[0090] In the above embodiment, two of the three protrusions 53 provided on one base portion 51 are anti-detachment protrusions 53a. However, this is not limited to this. If at least one of the multiple protrusions 53 provided on one base portion 51 is anti-detachment protrusion 53a, the claw portions 531 of the anti-detachment protrusions 53a can be hooked onto the bobbin 23, thereby more reliably preventing the base portion 51 from coming off the bobbin 23.

[0091] Furthermore, in the above embodiment, the claw portions 531 each protrude from the anti-removal projections 53a in the circumferential direction of the stator 2. However, the direction in which the claw portions 531 protrude from the anti-removal projections 53a is not limited to the circumferential direction of the stator 2. The claw portions 531 may protrude from the anti-removal projections 53a in any direction as long as the direction intersects with the direction in which the anti-removal projections 53a protrude from the base portion 51. Therefore, for example, the claw portions 531 may protrude from each anti-removal projection 53a in the direction along the axis of the stator 2. In this case, the direction in which the claw spaces 235 protrude from the insertion holes 234 is determined according to the direction in which the claw portions 531 protrude from the anti-removal projections 53a.

[0092] In the above embodiment, all of the protrusions 53 provided on one base portion 51 may be positioning protrusions 53b. Even in this case, the frictional force between the inner surface of the insertion hole 234 and the protrusions 53 can maintain the state in which the protrusions 53 are inserted into the insertion hole 234, and the base portion 51 can be attached to the bobbin 23.

[0093] In the above embodiment, one insertion hole 234 is provided in the inner circumferential side restricting portion 232 of each bobbin 23. However, the number of insertion holes 234 provided in the inner circumferential side restricting portion 232 of one bobbin 23 is not limited to one. Therefore, multiple insertion holes 234 may be provided in the inner circumferential side restricting portion 232 of one bobbin 23. In this case, the multiple insertion holes 234 are provided at intervals from one another in the circumferential direction of the stator 2.

[0094] Furthermore, in the above embodiment, a pair of claw spaces 235 are provided in insertion hole 234. However, only one of the pair of claw spaces 235 may be provided in insertion hole 234. Even in this case, by aligning the direction in which claw space 235 protrudes from insertion hole 234 with the direction in which claw portion 531 protrudes from anti-detachment protrusion 53a, it is possible to ensure that claw portion 531 enters claw space 235 when anti-detachment protrusion 53a is inserted into insertion hole 234.

[0095] Furthermore, in the above embodiment, a pair of claw spaces 235 are provided in the insertion hole 234. However, the insertion hole 234 does not have to have the claw spaces 235. Even in this case, when the anti-detachment protrusion 53a is inserted into the insertion hole 234, the claws 531 can be hooked on the inner periphery-side restricting portion 232 outside the inner periphery-side restricting portion 232 of the bobbin 23. This makes it possible to more reliably prevent the base portion 51 from coming off the bobbin 23.

[0096] In the above embodiment, the base portion 51 is attached to the bobbin 23 with the protrusions 53 provided on the base portion 51 inserted into the insertion holes 234. However, as long as the base portion 51 is attached to the stator 2, the protrusions 53 and the insertion holes 234 do not have to be provided. For example, the base portion 51 may be attached to the inner circumferential side restricting portion 232 of the bobbin 23 by adhesive, screws, or the like.

[0097] In the above embodiment, the protruding portion 54 protruding from one of the two adjacent base portions 51 is fitted into the recessed portion 515 provided in the other base portion 51. However, the recessed portion 515 does not have to be provided in the base portion 51. Even in this case, the protruding portion 54 protruding from one base portion 51 can be overlapped with the other base portion 51. This makes it possible to make each base portion 51 less likely to bend in the direction along the axis of the stator 2.

[0098] Furthermore, in the above embodiment, the protruding portion 54 and the recessed portion 515 do not have to be provided. Even in this case, each conductor holding member 5 can be attached to the stator 2 while avoiding the rotor 4. This allows the size of the rotating electric machine in the direction along the axis of the stator 2 to be reduced, thereby enabling the rotating electric machine to be made thinner.

[0099] In the above embodiment, the rotating electric machine is used as the electric motor, but the rotating electric machine may also be used as a generator, or as a generator-motor.

[0100] The configurations described in the above embodiments are merely examples of the contents of the present disclosure. The embodiments can be combined with other known technologies. Part of the configuration of the embodiments can be omitted or modified without departing from the gist of the present disclosure.

[0101] Examples of aspects that may be included in the present disclosure are set forth below as appendices. (Appendix 1) an annular stator; a rotor disposed inside the stator and rotatable relative to the stator about an axis of the stator; at least one conductor holding member that is arranged inside the stator and avoids the rotor, is attached to the stator, and is made of an insulating material having electrical insulation properties; Equipped with the stator includes a stator core and a plurality of coil assemblies provided on the stator core and arranged side by side in a circumferential direction of the stator, Each of the coil assemblies includes a stator coil and a bobbin interposed between the stator coil and the stator core, The stator coils are electrically connected by crossover wires, the crossover wire has an inner conductor portion disposed inside the stator, a coil connection conductor portion drawn from the stator coil and connected to the inner conductor portion, and an external lead-out conductor portion drawn from the inner conductor portion to the outside of the stator, the conductor holding member has a base portion attached to the bobbin and a holding portion provided on the base portion, the inner conductor portion is disposed inside the stator while being held by the holding portion on the base portion, The rotating electric machine has the coil connection conductor portion and the external lead conductor portion passing between two adjacent coil assembly components. (Appendix 2) The rotor has an annular recess formed therein and centered on the axis of the stator. a depth direction of the recess coincides with a direction along an axis of the stator, 2. The rotating electric machine according to claim 1, wherein the holding portion is located inside the recess. (Appendix 3) the conductor holding member has a protrusion provided on the base portion, the bobbin to which the base portion is attached is provided with an insertion hole into which the protrusion can be inserted, 3. The rotating electric machine according to claim 1, wherein the base portion is attached to the bobbin with the protrusion inserted into the insertion hole. (Appendix 4) A plurality of the protrusions are provided on one of the base portions, At least some of the protrusions provided on the base portion are anti-detachment protrusions, The anti-detachment projection has a claw portion at its tip, A rotating electric machine as described in Appendix 3, wherein when the anti-detachment protrusion is inserted into the insertion hole, the claw portion engages with the bobbin, thereby preventing the anti-detachment protrusion from coming out of the insertion hole. (Appendix 5) The insertion hole is provided with a space for a nail, The claw space portion protrudes from the insertion hole in a direction intersecting with a direction in which the insertion hole extends, 5. The rotating electric machine according to claim 4, wherein the claw portion is inserted into the claw space portion when the anti-detachment protrusion is inserted into the insertion hole. (Appendix 6) A plurality of the conductor holding members are attached to the stator, the base portions of the plurality of wire holding members are aligned in the circumferential direction of the stator, Each of the conductor holding members has a protruding portion that protrudes from the base portion in a circumferential direction of the stator, 6. A rotating electric machine according to any one of claims 1 to 5, wherein the protruding portion protruding from one of the two base portions adjacent to each other in the circumferential direction of the stator overlaps with the other base portion in a direction along the axis of the stator. (Appendix 7) The other base portion has a recessed portion, 7. The rotating electric machine according to claim 6, wherein the recessed portion is fitted with the protruding portion protruding from the one base portion. [Explanation of symbols]

[0102] 2 stator, 4 rotor, 5 conductor holding member, 20 coil assembly part, 21 stator core, 22 stator coil, 23 bobbin, 43 recess, 51 base portion, 52 holding portion, 53 protrusion, 53a anti-detachment protrusion, 54 extension portion, 55 jumper wire, 234 insertion hole, 235 space portion for claw, 515 recess portion, 531 claw portion, 551 coil connection conductor portion, 552 inner circumferential conductor portion, 553 external lead-out conductor portion.

Claims

1. an annular stator; a rotor disposed inside the stator and rotatable relative to the stator about an axis of the stator; at least one conductor holding member that is arranged inside the stator and avoids the rotor, is attached to the stator, and is made of an insulating material having electrical insulation properties; Equipped with the stator includes a stator core and a plurality of coil assemblies provided on the stator core and arranged side by side in a circumferential direction of the stator, Each of the coil assemblies includes a stator coil and a bobbin interposed between the stator coil and the stator core, The stator coils are electrically connected by crossover wires, the crossover wire has an inner conductor portion disposed inside the stator, a coil connection conductor portion drawn from the stator coil and connected to the inner conductor portion, and an external lead-out conductor portion drawn from the inner conductor portion to the outside of the stator, the conductor holding member has a base portion attached to the bobbin and a holding portion provided on the base portion, the inner conductor portion is disposed inside the stator while being held by the holding portion on the base portion, The rotating electric machine, wherein the coil connection conductor portion and the external lead conductor portion are passed between two adjacent coil assembly components.

2. The rotor has an annular recess formed therein and centered on the axis of the stator. a depth direction of the recess coincides with a direction along an axis of the stator, The rotating electric machine according to claim 1 , wherein the holding portion is located inside the recess.

3. the conductor holding member has a protrusion provided on the base portion, the bobbin to which the base portion is attached is provided with an insertion hole into which the protrusion can be inserted, 3. The rotating electric machine according to claim 1, wherein the base portion is attached to the bobbin with the projection inserted into the insertion hole.

4. A plurality of the protrusions are provided on one of the base portions, At least some of the protrusions provided on the base portion are anti-detachment protrusions, The anti-detachment projection has a claw portion at its tip, 4. The rotating electric machine according to claim 3, wherein when the anti-detachment projection is inserted into the insertion hole, the claw portion is hooked onto the bobbin, thereby preventing the anti-detachment projection from being removed from the insertion hole.

5. The insertion hole is provided with a space for a nail, The claw space portion protrudes from the insertion hole in a direction intersecting with a direction in which the insertion hole extends, 5. The rotating electric machine according to claim 4, wherein the claw portion is inserted into the claw space when the anti-detachment projection is inserted into the insertion hole.

6. A plurality of the conductor holding members are attached to the stator, the base portions of the plurality of wire holding members are aligned in the circumferential direction of the stator, Each of the wire holding members has a protruding portion that protrudes from the base portion in a circumferential direction of the stator, 3. The rotating electric machine according to claim 1, wherein the protruding portion extending from one of the two base portions adjacent to each other in the circumferential direction of the stator overlaps with the other base portion in the direction along the axis of the stator.

7. The other base portion has a recessed portion, The rotating electric machine according to claim 6 , wherein the recessed portion is fitted with the protruding portion protruding from the one base portion.

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