Rotating electric machine

Abstract

To provide a rotating electric machine that can be made thinner. [Solution] In a rotating electric machine, a plurality of stator coils 22 are electrically connected by jumper wires 55. The jumper wires 55 have an inner circumference conductor portion 552 located inside the stator 2, a coil connection conductor portion 551 drawn out from the stator coils 22 and connected to the inner circumference conductor portion 552, and an external lead conductor portion 553 drawn out from the inner circumference conductor portion 552 to the outside of the stator 2. At least one conductor holding member 5 is attached to the stator 2, which is located inside the stator 2, avoiding the rotor. The inner circumference conductor portion 552 is located inside the stator 2, held by the holding portion 52 of the conductor holding member 5 on the base portion 51. 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 electrical machine.

Background Art

[0002] Patent Document 1 discloses an inner rotor type motor in which a rotor is disposed inside a stator. A plurality of coils in the stator are electrically connected by connection wiring. The stator is provided with a positioning member for positioning the connection wiring. The positioning member is inclined outward in the axial direction of the stator as it goes toward the center on the inner side in the radial direction of the stator.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional motor disclosed in Patent Document 1, a positioning member for positioning the connection wiring protrudes outward in the axial direction of the stator from the stator. For this reason, the dimension in the axial direction of the motor increases.

[0005] For example, in a machine roomless elevator without a machine room, it is necessary to install an elevator hoisting machine in the gap between the inner wall surface of the hoistway and the car. For this reason, the motor incorporated in the elevator hoisting machine is required to be thinned. However, in the conventional motor disclosed in Patent Document 1, since the dimension in the axial direction of the motor increases, the motor cannot be thinned.

[0006] The present disclosure solves the above problems and aims to provide a rotating electrical machine capable of achieving thinning.

Means for Solving the Problems

[0007] The rotating electric machine according to this disclosure comprises an annular stator, a rotor disposed inside the stator and rotatable relative to the stator about the axis of the stator, and at least one conductor holding member disposed inside the stator, avoiding the rotor, and attached to the stator, and made of an electrically insulating insulating material, the stator having a stator core and a plurality of coil assembly components provided on the stator core in a line in the circumferential direction of the stator, each coil assembly component having a stator coil and a bobbin interposed between the stator coil and the stator core, each The stator coils are electrically connected by jumper wires, each having an inner circumference conductor section located inside the stator, a coil connection conductor section drawn out from the stator coils and connected to the inner circumference conductor section, and an outer lead conductor section drawn out from the inner circumference conductor section to the outside of the stator. The conductor holding member has a base section attached to a bobbin and a holding section provided on the base section, with the inner circumference conductor section being held by the holding section on the base section and located inside the stator, and the coil connection conductor section and the outer lead conductor section passing between two adjacent coil assembly components. [Effects of the Invention]

[0008] According to this disclosure, it is possible to make rotating electric machines thinner. [Brief explanation of the drawing]

[0009] [Figure 1] This is a perspective view showing a rotating electric machine according to Embodiment 1. [Figure 2] This is a partial cross-sectional view showing a portion of the rotating electric machine in Figure 1. [Figure 3] This is a cross-sectional view along line III-III in Figure 2. [Figure 4] Figure 3 is a perspective view showing the bobbin components in a bobbin. [Figure 5] Figure 1 is a perspective view showing the wire holding member. [Figure 6]Figure 5 is a front view showing the wire holding member. [Figure 7] This is a cross-sectional view along line VII-VII in Figure 6. [Figure 8] Figure 1 is a perspective view of the main components showing the jumper wires connected to each stator coil arranged on the stator. [Figure 9] Figure 8 is a front view showing the stator. [Figure 10] This is a cross-sectional view along line XX in Figure 9. [Figure 11] This is a cross-sectional view along the line XI-XI in Figure 9. [Modes for carrying out the invention]

[0010] The embodiments for carrying out the subject matter of this disclosure will be described with reference to the attached figures. In each figure, the same or corresponding parts are denoted by the same reference numerals, and redundant explanations are simplified or omitted as appropriate. The subject matter of this disclosure is not limited to the following embodiments, and any modification of any component of the embodiments or omission of any component of the embodiments is possible without departing from the spirit of this disclosure.

[0011] Embodiment 1. Figure 1 is a perspective view showing a rotating electric machine according to Embodiment 1. Figure 2 is a partial cross-sectional view showing a part of the rotating electric machine of Figure 1. Figure 3 is a cross-sectional view along line III-III in Figure 2. In the figures, 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 Figures 1 and 2, a part of the housing 1 is omitted from the illustration. Also, in Figures 2 and 3, the wire holding members 5 are omitted from the illustration for simplicity.

[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 facing each other in the direction along the axis of the housing 1. Thereby, a space is formed inside the housing 1. The stator 2, the rotor 4, and each conductor holding member 5 are accommodated inside the housing 1. A through hole 13 penetrating the frame portion 12 along the axis of the housing 1 is provided at the center of the frame portion 12.

[0013] The stator 2 is fixed to the housing 1. As shown in FIG. 2, the shape of the stator 2 is an annular shape having 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 assembly parts 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 an annular shape 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 portions 212.

[0015] The shape of the yoke portion 211 is an annular shape along the circumferential direction of the stator 2. In the present embodiment, the yoke portion 211 is composed of a plurality of unit yoke portions 211a. The plurality of unit yoke portions 211a are continuously connected in an annular shape in the circumferential direction of the stator 2.

[0016] The plurality of teeth portions 212 are provided on the yoke portion 211. Each tooth portion 212 projects from the inner peripheral portion of the yoke portion 211 toward the inner side in the radial direction of the stator 2. The radial direction of the stator 2 is the direction along the radius of a circle centered on the axis of the stator 2.

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

[0018] The plurality of coil assembly parts 20 are provided on the stator core 21 in a state of being arranged side by side in the circumferential direction of the stator 2. The plurality of coil assembly parts 20 are provided on the plurality of tooth portions 212 respectively. Therefore, the plurality of coil assembly parts 20 are arranged at intervals in the circumferential direction of the stator 2. Also, in the present embodiment, the number of coil assembly parts 20 provided on the stator core 21 is 18.

[0019] Each coil assembly part 20 has a stator coil 22 and a bobbin 23. The stator coil 22 is composed of a conductor wound around the tooth portion 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. Also, the bobbin 23 surrounds the tooth portion 212. The bobbin 23 is composed of an insulating material having electrical insulation properties. As the material constituting the bobbin 23, resin or the like is used. Thereby, the bobbin 23 ensures an electrical insulation state between the stator coil 22 and the stator core 21.

[0021] In this embodiment, as shown in Figure 3, a pair of bobbin components 23a are combined with the teeth portion 212 in between to form a single bobbin 23. The pair of bobbin components 23a are fitted onto the teeth portion 212 from both outer sides in the direction along the axis of the stator 2.

[0022] As shown in Figures 2 and 3, the bobbin 23 has a winding drum portion 231, an inner circumference regulating portion 232, and an outer circumference regulating portion 233.

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

[0024] The inner circumference regulating portion 232 is provided at the inner end of the winding drum portion 231 in the radial direction of the stator 2. When viewing the bobbin 23 from the radially inner side of the stator 2, the inner circumference regulating portion 232 protrudes outward from the winding drum portion 231. The inner circumference regulating portion 232 is interposed between the tip of the teeth portion 212 and the stator coil 22.

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

[0026] The conductors in the stator coil 22 are wound around the teeth portion 212 via the winding drum portion 231. As a result, in the bobbin 23, the stator coil 22 is positioned between the inner circumference restricting portion 232 and the outer circumference restricting portion 233.

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

[0028] The rotor 4 is fixed to the spindle 3. The rotor 4 is positioned inside the stator 2. There is a gap between the outer circumference of the rotor 4 and the inner circumference of the stator 2. This allows the rotor 4 to rotate integrally with the spindle 3 around the axis of the stator 2, relative to the housing 1 and the stator 2.

[0029] As shown in Figure 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 shape of the rotor core 41 is cylindrical. The axis of the rotor core 41 coincides with the axis of the stator 2.

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

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

[0032] Multiple stator coils 22 are electrically connected by multiple jumper wires, which will be described later. In Figure 1, the jumper wires are omitted for simplicity. Three-phase current is supplied to the multiple stators 2. A rotating magnetic field is generated in the stators 2 by supplying current to the multiple stator coils 22. The rotor 4 rotates integrally with the main shaft 3 relative to the housing 1 and stators 2 due to the generation of the rotating magnetic field. Therefore, in this embodiment, a rotating electric machine is used as an electric motor.

[0033] As shown in Figure 1, the multiple wire holding members 5 are attached to the stator 2. In this embodiment, there are five wire holding members 5 attached to the stator 2. The multiple wire holding members 5 are arranged in the circumferential direction of the stator 2.

[0034] Each wire holder 5 is positioned inside the stator 2, avoiding the rotor 4. Each wire holder 5 is positioned away from the rotor 4 in the direction along the axis of the stator 2. As a result, the rotor 4 rotates relative to the stator 2 without interfering with each wire holder 5. Furthermore, each wire holder 5 is positioned within the range of the stator 2 in the direction along the axis of the stator 2.

[0035] Each wire holding member 5 is attached to at least one of the multiple bobbins 23. In this embodiment, one wire holding member 5 is attached to three bobbins 23. In this embodiment, the wire holding member 5 is also attached to the inner circumference restricting portion 232 of the bobbin 23.

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

[0037] Figure 4 is a perspective view showing the bobbin component 23a in the bobbin 23 of Figure 3. In each bobbin 23, an insertion hole 234 for attaching the wire holding member 5 is provided in the inner circumference restricting portion 232. In each bobbin 23, the insertion hole 234 penetrates the inner circumference restricting portion 232 along the radial direction of the stator 2. In each bobbin 23, the dimension of the inner circumference restricting portion 232 in the radial direction of the stator 2 is larger than the dimension of the outer circumference 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 in opposite directions in a direction intersecting the direction in which the insertion hole 234 extends. In this embodiment, the pair of claw spaces 235 protrude from the insertion hole 234 in opposite directions in the circumferential direction of the stator 2. In addition, in this embodiment, the pair of claw spaces 235 are provided at the end of the insertion hole 234 along the radial direction of the stator 2 that is closer to the stator coil 22. As a result, in this embodiment, a T-shaped hole is provided in the inner circumferential regulating 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, are formed at both ends of the inner circumferential restricting portion 232 of the stator 2 in the circumferential direction. As a result, the dimensions of the bobbin 23 in the circumferential direction of the stator 2 continuously narrow toward the outside of the bobbin 23 at the positions where the pair of chamfered portions 232a are formed. Therefore, the gap between two adjacent inner circumferential restricting portions 232 of the stator 2 is wider at the positions where chamfered portions 232a are formed than at the positions where chamfered portions 232a are not formed.

[0040] Figure 5 is a perspective view showing the wire holding member 5 of Figure 1. Figure 6 is a front view showing the wire holding member 5 of Figure 5. Figure 7 is a cross-sectional view along the line VII-VII in Figure 6. The wire holding member 5 is made of an insulating material that has electrical insulating properties. Resin is used as the material that makes up the wire holding member 5. The wire holding member 5 has a base portion 51, a plurality of holding portions 52, a plurality of protrusions 53, and an overhanging portion 54.

[0041] The dimensions of the base portion 51 of the stator 2 in the circumferential direction are continuously decreasing from the outer edge to the inner edge of the wire 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 fan shape excluding the central portion, as shown in Figure 6.

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

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

[0044] The thickness directions of the first base plate 511 and the second base plate 512 are aligned with the direction along the axis of the stator 2. As shown in Figures 5 and 7, the second base plate 512 is positioned 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 has a second base front surface 512a and a second base back surface 512b. The second base front surface 512a and the second base back surface 512b face opposite each other in the thickness direction of the second base plate 512. The second base plate 512 is positioned with its second base front surface 512a facing the side where the first base plate 511 is offset relative to the second base plate 512.

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

[0047] Multiple holding parts 52 are provided on the second base plate 512 of the base part 51. Multiple wiring paths are set on the second base plate 512 along the circumferential direction of the stator 2. The holding parts 52 are arranged in each wiring path.

[0048] In this embodiment, three wiring paths are set on the second base plate 512, spaced apart from each other in the radial direction of the stator 2, and three holding parts 52 are arranged in each wiring path, spaced apart from each other. Therefore, in this embodiment, nine holding parts 52 are provided on the second base plate 512.

[0049] Each retaining portion 52 is provided on the second base surface 512a of the second base plate 512. As a result, as shown in Figure 7, each retaining portion 52 is positioned within the range 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.

[0050] Each holding portion 52 holds a portion of the jumper wires, which will be described later, connected to a plurality of stator coils 22, to 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. Furthermore, the pair of side walls 521 face each other in the radial direction of the stator 2, with a wiring path in between.

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

[0053] As shown in Figures 5 and 6, the multiple protrusions 53 are provided on the base portion 51. Each protrusion 53 projects radially outward from the stator 2 from the outer edge formed on the first base plate 511.

[0054] Multiple protrusions 53 are arranged at intervals from each other in the circumferential direction of the stator 2. The spacing of the multiple protrusions 53 in the circumferential direction of the stator 2 corresponds to the spacing of 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, of the three protrusions 53, two protrusions 53 are retaining protrusions 53a, and the remaining protrusion 53 is a positioning protrusion 53b. The positioning protrusion 53b is located between the two retaining protrusions 53a in the circumferential direction of the stator 2.

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

[0057] Each retaining projection 53a is elastically deformable. When a retaining projection 53a is inserted into the insertion hole 234, the claw portion 531 contacts the inner surface of the insertion hole 234, causing the retaining projection 53a to elastically deform. Once the insertion of the retaining projection 53a into the insertion hole 234 is complete, the claw portion 531 enters the claw space 235, and the elastic deformation of the retaining projection 53a is restored. By entering the claw space 235, the claw portion 531 engages with the inner circumference restricting portion 232 of the bobbin 23. When the retaining projection 53a is inserted into the insertion hole 234, the claw portion 531 engages with the bobbin 23, preventing the retaining projection 53a from coming out of the insertion hole 234. In other words, the structure of each retaining projection 53a is a snap-fit ​​structure. Also, when the retaining projection 53a is inserted into the insertion hole 234, the claw portion 531 is in one of the pair of claw spaces 235. This prevents a portion of the retaining projection 53a from protruding from the insertion hole 234, thus avoiding a reduction in the space available for positioning the stator coil 22.

[0058] The positioning projection 53b does not have a claw portion 531. The positioning projection 53b is inserted into the insertion hole 234 to position the wire holding member 5 relative to the stator 2.

[0059] In each wire holding member 5, the protruding portion 54 extends from the base portion 51 in the circumferential direction of the stator 2. In this embodiment, the protruding portion 54 extends 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 overhang 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, a step is located at the boundary between the second base plate 512 and the overhang 54, as shown in Figure 5, where the overhang 54 is offset from the second base surface 512a of the second base plate 512.

[0061] Each wire holding member 5 has a recessed portion 515 in the base portion 51. The depth direction of the recessed portion 515 coincides with the direction along the axis of the stator 2. The recessed portion 515 is provided at the end of the base portion 51 opposite to the end on which the protruding portion 54 is provided in the circumferential direction of the stator 2. In this embodiment, the recessed portion 515 is provided on the second base back surface 512b of the second base plate 512 along the radial direction of the stator 2.

[0062] As shown in Figure 1, the base portions 51 of each of the multiple wire holding members 5 are arranged in the circumferential direction of the stator 2. Of the two base portions 51 adjacent to each other in the circumferential direction of the stator 2, the protruding portion 54 extending from one base portion 51 is fitted into a recess 515 provided in the other base portion 51. In this embodiment, five base portions 51 are arranged in a continuous line in the circumferential direction of the stator 2, and two base portions 51 located at both ends of the continuous line of five base portions 51 are located at a distance from each other.

[0063] Figure 8 is a main perspective view showing the jumper wires connected to each stator coil 22 in Figure 1 arranged on the stator 2. Figure 9 is a front view showing the stator 2 in Figure 8. Figure 10 is a cross-sectional view along line XX in Figure 9. Figure 11 is a cross-sectional view along line XI-XI in Figure 9.

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

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

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

[0067] As shown in Figure 11, of the two adjacent base portions 51 of the stator 2 in the circumferential direction, the protruding portion 54 extending from one base portion 51 overlaps the other base portion 51 in the direction along the axis of the stator 2. This makes it difficult for the base portion 51 of each conductor holding member 5 to bend in the direction along the axis of the stator 2. In addition, of the two adjacent base portions 51 of the stator 2 in the circumferential direction, the protruding portion 54 extending from one base portion 51 fits into a recess 515 provided in the other base portion 51. The two adjacent base portions 51 of the stator 2 in the circumferential direction are connected to each other by the protruding portion 54 fitting into the recess 515.

[0068] Multiple stator coils 22 are electrically connected by multiple jumper wires 55. Each jumper wire 55 corresponds to one of the phases of the three-phase current supplied to the multiple stator coils 22. Each jumper wire 55 is connected to one of the multiple stator coils 22 that is in phase with the corresponding phase. In this embodiment, three jumper wires 55, each corresponding to one phase of the three-phase current, are connected to the multiple stator coils 22.

[0069] As shown in Figures 8 and 9, each connecting wire 55 has a plurality of coil connecting conductor sections 551, an inner circumference conductor section 552, and an outer lead-out conductor section 553.

[0070] The inner circumferential conductor portion 552 is located inside the stator 2. The inner circumferential conductor portion 552 is arranged along the circumferential direction of the stator 2.

[0071] In each wire holding member 5, the inner circumference wire portion 552 of each jumper wire 55 is positioned along each wiring path set in the base portion 51. Furthermore, in each wire holding member 5, the inner circumference wire portion 552 is held to the base portion 51 by each holding portion 52 located in the wiring path where the inner circumference wire portion 552 is positioned. As a result, when each jumper wire 55 is viewed along the axis of the stator 2, the inner circumference wire portion 552 of each jumper wire 55 is located within the region of the rotor 4, as shown in Figure 9. Also, the inner circumference wire portion 552 of each jumper wire 55 is located inside the recess 43 provided in the rotor 4, as shown in Figure 10. The inner circumference wire portion 552 is positioned inside the stator 2 while being held to the base portion 51 by each holding portion 52. Each wire holding member 5 holds each jumper wire 55 by holding the inner circumference wire portion 552 to the base portion 51 by each holding portion 52. This ensures electrical insulation between each jumper wire 55 and the rotor 4.

[0072] In each holding portion 52, as shown in Figure 10, the inner circumferential wire portion 552 is passed between a pair of side walls 521. In each holding portion 52, the inner circumferential wire portion 552 is prevented from coming out from between the pair of side walls 521 by a protruding piece 522. In this embodiment, the inner circumferential wire portion 552 is inserted between the pair of side walls 521 by pushing the inner circumferential wire portion 552 between the pair of side walls 521 while elastically deforming the protruding piece 522 from above the holding portion 52.

[0073] In each connecting wire 55, as shown in Figure 9, multiple coil connection conductors 551 drawn from each stator coil 22 of the same phase are connected to the inner circumference conductor 552 of the same phase. That is, each coil connection conductor 551 connected to multiple stator coils 22 of the same phase is drawn from each stator coil 22 and connected to the inner circumference conductor 552 of the same phase. Each coil connection conductor 551 reaches the inner circumference conductor 552 by passing between two adjacent coil assembly parts 20. Therefore, each coil connection conductor 551 reaches the inner circumference conductor 552 by passing between two adjacent stator coils 22 and between two adjacent inner circumference restricting parts 232. Between two adjacent inner circumference restricting parts 232, the coil connection conductor 551 passes between the chamfered portions 232a formed on each of the two inner circumference restricting parts 232.

[0074] In each jumper wire 55, an external lead wire section 553, which is electrically connected to a power supply (not shown) located outside the rotating electric machine, is connected to an in-phase internal lead wire section 552. The external lead wire section 553 is led out from the internal lead wire section 552 to the outside of the stator 2. The external lead wire section 553 reaches the outside of the stator 2 by passing from the internal lead wire section 552 between two adjacent coil assembly parts 20. As a result, the external lead wire section 553 reaches the outside of the stator 2 by sequentially passing from the internal lead wire section 552 between two adjacent internal regulating parts 232, between two adjacent stator coils 22, and between two adjacent outer regulating parts 233. Between two adjacent internal regulating parts 232, the external lead wire section 553 passes between the chamfered portions 232a formed on each of the two internal regulating parts 232. As a result, each connecting wire 55 is positioned 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 jumper wire 55, a rotating magnetic field is generated in the stator 2. As a result, the rotor 4 rotates integrally with the main shaft 3 relative to the housing 1 and stator 2. At this time, each jumper wire 55 is held by each wire holding member 5, preventing the jumper wires 55 from coming into contact with the rotating rotor 4.

[0076] In this type of rotating electric machine, the wire holding member 5 attached to the stator 2 is positioned inside the stator 2, avoiding the rotor 4. The jumper wire 55 that electrically connects the multiple stator coils 22 has a coil connecting wire section 551, an inner circumference wire section 552, and an outer lead wire section 553. The inner circumference wire section 552 is positioned inside the stator 2, held by the holding section 52 of the wire holding member 5 to the base section 51. The coil connecting wire section 551 is drawn out from the stator coil 22 and connected to the inner circumference wire section 552. The outer lead wire section 553 is drawn out from the inner circumference wire section 552 to the outside of the stator 2. The coil connecting wire section 551 and the outer lead wire section 553 are passed between two adjacent coil assembly parts 20.

[0077] Therefore, it is possible to avoid arranging the coil connection wire section 551, the inner circumference wire section 552, and the external lead wire section 553 on the outside of the stator 2 in the direction along the axis of the stator 2. This prevents the jumper wires 55 from protruding to the outside of the stator 2 in the direction along the axis of the stator 2. Consequently, the dimensions of the rotating electric machine in the direction along the axis of the stator 2 can be reduced, and the rotating electric machine can be made 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 located inside the recess 43. Therefore, the retaining portion 52 can be positioned within the range of the rotor 4 in the direction along the axis of the stator 2. This makes it possible to more reliably avoid the placement of the connecting wires 55 on the outside of the stator 2 in the direction along the axis of the stator 2, and to further reliably achieve a thinner rotating electric machine.

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

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

[0081] Furthermore, the insertion hole 234 is provided with a pair of claw spaces 235. The pair of claw spaces 235 protrude from the insertion hole 234 in opposite directions in a direction intersecting the direction in which the insertion hole 234 extends. When the retaining projection 53a is inserted into the insertion hole 234, the claw portion 531 is located in one of the pair of claw spaces 235. This allows the claw portion 531 to engage with the bobbin 23 while the retaining projection 53a is in the insertion hole 234, preventing part of the retaining projection 53a from protruding from the insertion hole 234. This prevents the space available for stator coil 22 from becoming narrowed.

[0082] Furthermore, each wire holding member 5 has an overhang 54 that extends from the base portion 51 in the circumferential direction of the stator 2. Of the two adjacent base portions 51 in the circumferential direction of the stator 2, the overhang 54 extending from one base portion 51 overlaps with the other base portion 51 in the direction along the axis of the stator 2. Therefore, each base portion 51 can be made less prone to bending in the direction along the axis of the stator 2. This suppresses the occurrence of problems in which each wire holding member 5 comes into contact with the rotor 4, thereby improving the reliability of the rotating electric machine.

[0083] Furthermore, of the two adjacent base portions 51 of the stator 2, the protruding portion 54 extending from one base portion 51 fits into a recess 515 provided in the other base portion 51. This allows the two adjacent base portions 51 to be connected to each other, making each conductor holding member 5 even more secure and less prone to bending. Also, because the protruding portion 54 fits into the recess 515, it is less likely that a step will be formed at the boundary between the two adjacent base portions 51. As a result, the inner circumferential conductor portion 552 of the jumper wire 55 can be held in place by the holding portion 52 on the base portion 51 without significantly bending it at the boundary between the two adjacent base portions 51. Therefore, the wiring work of the jumper wire 55 can be made easier.

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

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

[0086] Furthermore, in the above embodiment, there are three holding parts 52 that hold one inner circumference conductor portion 552 on one base portion 51. However, it is not limited to this. The number of holding parts 52 that hold one inner circumference conductor portion 552 on one base portion 51 may be one, two, or four or more.

[0087] Furthermore, in the above embodiment, in each holding portion 52, a protruding piece 522 protrudes from one side wall 521 toward the other side wall 521, and the protruding piece 522 is not connected to the other side wall 521. However, in each holding portion 52, the protruding piece 522 may be connected to each of the pair of side walls 521. Even in this case, the inner circumferential conductor portion 552 can be passed between the pair of side walls 521 from the open portion of the space enclosed by the pair of side walls 521 and the protruding piece 522. This allows the holding portion 52 to hold the inner circumferential conductor portion 552 to the base portion 51. Also, if the inner circumferential conductor portion 552 can be held between the pair of side walls 521, the protruding piece 522 may not be necessary in each holding portion 52.

[0088] Furthermore, 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. In other words, the base portion 51 only needs to be attached to at least one of the multiple 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 multiple other than three, or it may be just one. In this case, insertion holes 234 are provided in the inner circumference regulating portion 232 of each bobbin 23, corresponding to the positions of each protrusion 53 in the circumferential direction of the stator 2. Even in this way, the base portion 51 can be easily attached to the bobbin 23, and the positioning of the wire holding member 5 relative to the stator 2 can be easily performed.

[0090] Furthermore, in the above embodiment, of the three protrusions 53 provided on one base portion 51, two of the protrusions 53 are retaining protrusions 53a. However, the embodiment is not limited to this. If at least one of the multiple protrusions 53 provided on one base portion 51 is a retaining protrusion 53a, the claw portion 531 of the retaining protrusion 53a engages with 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 retaining projections 53a in the circumferential direction of the stator 2. However, the direction in which the claw portions 531 protrude from the retaining projections 53a is not limited to the circumferential direction of the stator 2. The claw portions 531 may protrude from the retaining projections 53a in any direction that intersects with the direction in which the retaining projections 53a protrude from the base portion 51. Therefore, for example, the claw portions 531 may each protrude from the retaining projections 53a in a direction along the axis of the stator 2. In this case, the direction in which the claw space portion 235 protrudes from the insertion hole 234 is determined in accordance with the direction in which the claw portions 531 protrude from the retaining projections 53a.

[0092] Furthermore, in the above embodiment, all of the protrusions 53 provided on a single 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 protrusion 53 can maintain the state in which the protrusion 53 is inserted into the insertion hole 234, and the base portion 51 can be attached to the bobbin 23.

[0093] Furthermore, in the above embodiment, one insertion hole 234 is provided in the inner circumference restricting portion 232 of each bobbin 23. However, the number of insertion holes 234 provided in the inner circumference restricting portion 232 of a single bobbin 23 is not limited to one. Therefore, multiple insertion holes 234 may be provided in the inner circumference restricting portion 232 of a single bobbin 23. In this case, the multiple insertion holes 234 are provided spaced apart from each other in the circumferential direction of the stator 2.

[0094] Furthermore, in the above embodiment, a pair of claw spaces 235 are provided in the insertion hole 234. However, only one of the pair of claw spaces 235 may be provided in the insertion hole 234. Even in this case, if the direction in which the claw space 235 protrudes from the insertion hole 234 is aligned with the direction in which the claw portion 531 protrudes from the retaining projection 53a, the claw portion 531 can be made to enter the claw space 235 when the retaining projection 53a is inserted into the 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 necessarily need to have claw spaces 235. Even in this case, when the anti-detachment projection 53a is inserted into the insertion hole 234, the claw portion 531 can be positioned outside the inner circumference restricting portion 232 of the bobbin 23 so as to engage with the inner circumference restricting portion 232. This makes it possible to more reliably prevent the base portion 51 from coming off the bobbin 23.

[0096] Furthermore, in the above embodiment, the base portion 51 is attached to the bobbin 23 with each projection 53 provided on the base portion 51 inserted into each insertion hole 234. However, if the base portion 51 is attached to the stator 2, the projections 53 and insertion holes 234 are not necessary. For example, the base portion 51 may be attached to the inner circumference regulating portion 232 of the bobbin 23 by adhesive, screws, or the like.

[0097] Furthermore, in the above embodiment, of the two adjacent base portions 51, the protruding portion 54 extending from one base portion 51 is fitted into a recessed portion 515 provided in the other base portion 51. However, the recessed portion 515 does not necessarily have to be present in the base portion 51. Even in this case, the protruding portion 54 extending from one base portion 51 can be superimposed on the other base portion 51. This makes it possible to make each base portion 51 less prone to bending 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 may be omitted. Even in this case, each wire holding member 5 can be attached to the stator 2 while avoiding the rotor 4. 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 the rotating electric machine thinner.

[0099] Furthermore, in the above embodiment, a rotating electric machine is used as an electric motor. However, a rotating electric machine may also be used as a generator, or as a generator-motor.

[0100] The configurations shown in the embodiments described above are merely examples of the content of this disclosure. The embodiments can be combined with other known technologies. Some parts of the configurations of the embodiments can be omitted or modified without departing from the gist of this disclosure.

[0101] Examples of aspects that may be included in this disclosure are listed below as an addendum. (Note 1) A ring-shaped stator, A rotor is positioned inside the stator and is rotatable relative to the stator about the axis of the stator, At least one wire holding member is positioned inside the stator, avoiding the rotor, and attached to the stator, and is made of an electrically insulating insulating material. Equipped with, The stator comprises a stator core and a plurality of coil assembly components arranged in a circumferential direction on the stator core. Each of the coil assembly components comprises a stator coil and a bobbin interposed between the stator coil and the stator core. Each of the stator coils is electrically connected by jumper wires. The jumper wire has an inner circumferential conductor portion located inside the stator, a coil connecting conductor portion drawn out from the stator coil and connected to the inner circumferential conductor portion, and an external lead-out conductor portion drawn out from the inner circumferential conductor portion to the outside of the stator. The wire holding member has a base portion attached to the bobbin and a holding portion provided on the base portion. The inner circumferential conductor portion is positioned inside the stator while being held by the holding portion on the base portion. The coil connection wire section and the external lead wire section are passed between two adjacent coil assembly components in a rotating electric machine. (Note 2) The rotor has an annular recess formed around the axis of the stator, The depth direction of the recess coincides with the direction along the axis of the stator. The holding portion is located inside the recess and is the rotating electric machine described in Appendix 1. (Note 3) The wire holding member has a projection provided on the base portion, The bobbin to which the base portion is attached is provided with an insertion hole into which the projection can be inserted. The base portion is attached to the bobbin with the projection inserted into the insertion hole, as described in Appendix 1 or Appendix 2. (Note 4) Each of the base portions is provided with a plurality of the protrusions, Of the multiple protrusions provided on the single base portion, at least some of the protrusions are anti-detachment protrusions. The tip of the aforementioned anti-detachment projection is provided with a claw portion. The rotating electric machine as described in Appendix 3, wherein when the retaining projection is inserted into the insertion hole, the claw portion engages with the bobbin, preventing the retaining projection from coming out of the insertion hole. (Note 5) The aforementioned insertion hole is provided with a space for the claw, The claw space protrudes from the insertion hole in a direction intersecting the direction in which the insertion hole extends, The rotating electric machine as described in Appendix 4, wherein the claw portion is in the claw space when the retaining projection is inserted into the insertion hole. (Note 6) Multiple wire-holding members are attached to the stator. Each of the base portions of the plurality of wire holding members is arranged in the circumferential direction of the stator, Each of the aforementioned wire holding members has an overhang that extends from the base portion in the circumferential direction of the stator, The rotating electric machine according to any one of the appendices 1 to 5, wherein, of the two base portions adjacent to each other in the circumferential direction of the stator, the protruding portion extending from one base portion overlaps the other base portion in the direction along the axis of the stator. (Note 7) The other base portion is provided with a recessed portion. The rotating electric machine as described in Appendix 6, wherein the protruding portion extending from one of the base portions is fitted into the recessed portion. [Explanation of symbols]

[0102] 2 Stator, 4 Rotor, 5 Wire holding member, 20 Coil assembly part, 21 Stator core, 22 Stator coil, 23 Bobbin, 43 Recess, 51 Base part, 52 Holding part, 53 Projection, 53a Anti-detachment projection, 54 Protruding part, 55 Jumper wire, 234 Insertion hole, 235 Space for claw, 515 Recess, 531 Claw part, 551 Coil connection wire part, 552 Inner circumference wire part, 553 Outer lead wire part.

Claims

1. A ring-shaped stator, A rotor is positioned inside the stator and is rotatable relative to the stator about the axis of the stator, At least one wire holding member is positioned inside the stator, avoiding the rotor, and attached to the stator, and is made of an electrically insulating insulating material. Equipped with, The stator comprises a stator core and a plurality of coil assembly components arranged in a circumferential direction on the stator core. Each of the coil assembly components comprises a stator coil and a bobbin interposed between the stator coil and the stator core. Each of the stator coils is electrically connected by jumper wires. The jumper wire has an inner circumferential conductor portion located inside the stator, a coil connecting conductor portion drawn out from the stator coil and connected to the inner circumferential conductor portion, and an external lead-out conductor portion drawn out from the inner circumferential conductor portion to the outside of the stator. The wire holding member has a base portion attached to the bobbin and a holding portion provided on the base portion. The inner circumferential conductor portion is positioned inside the stator while being held by the holding portion on the base portion. The coil connection conductor section and the external lead conductor section are passed between two adjacent coil assembly components in a rotating electric machine.

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

3. The wire holding member has a projection provided on the base portion, The bobbin to which the base portion is attached is provided with an insertion hole into which the projection can be inserted. The rotating electric machine according to claim 1 or claim 2, wherein the base portion is attached to the bobbin with the projection inserted into the insertion hole.

4. Each of the base portions is provided with a plurality of the aforementioned protrusions. Of the multiple protrusions provided on the single base portion, at least some of the protrusions are anti-detachment protrusions. The tip of the aforementioned anti-detachment projection is provided with a claw portion. The rotating electric machine according to claim 3, wherein when the retaining projection is inserted into the insertion hole, the claw portion engages with the bobbin, thereby preventing the retaining projection from coming out of the insertion hole.

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

6. Multiple wire-holding members are attached to the stator. Each of the base portions of the plurality of wire holding members is arranged in the circumferential direction of the stator, Each of the aforementioned wire holding members has an overhang that extends from the base portion in the circumferential direction of the stator, The rotating electric machine according to claim 1 or claim 2, wherein of the two base portions adjacent to each other in the circumferential direction of the stator, the protruding portion extending from one base portion overlaps the other base portion in a direction along the axis of the stator.

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

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