Stator structure

Abstract

To provide a bus bar structure which can fix a bus bar holder and an insulation cap by a small number of steps.SOLUTION: A stator structure 1 includes: a ring-shaped stator core 20 having a plurality of protruding magnetic poles 23 protruding in a radial direction at predetermined angle intervals: an insulation cap 30 provided in each protruding magnetic pole 23 to cover at least a part of each protruding magnetic pole 23, the insulation cap holding a stator coil wound around each protruding magnetic pole 23; and a bus bar holder 60 provided in an end part of the ring-shaped stator core 20 in an axial direction, the bus bar holder storing bus bars 51a, 51b, 51c, 51d, 51e, 51f, and 51g connected to the stator coil. Each insulation cap 30 has a connection part 33 protruding in the axial direction of the ring-shaped stator core 20. The bus bar holder 60 has a protruding part 63 protruding in the radial direction and the connection part 33 is connected to the protruding part 63.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a stator structure, and more particularly to a stator structure having an insulating cap provided on a stator core.

Background Art

[0002] As a conventional stator structure, for example, a stator structure as described in Patent Document 1 is known. The stator structure described in this Patent Document 1 has a bus bar holder that holds a bus bar connected to a stator winding, and an insulating cap provided on the stator core that insulates the stator core and the stator winding. A boss provided on the insulating cap is inserted into a hole provided in this bus bar holder, and the tip of the boss is thermally welded or caulked to fix the bus bar holder and the insulating cap.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the stator structure as described in Patent Document 1, in order to insert the boss of the insulating cap into the hole of the bus bar holder and thermally weld or caulk the tip of the boss to fix the bus bar holder and the insulating cap, there is a problem of a large number of man-hours.

[0005] This invention has been made to solve such problems, and an object thereof is to provide a bus bar structure capable of fixing a bus bar holder and an insulating cap with fewer man-hours.

Means for Solving the Problems

[0006] In order to solve the above problems, the stator structure according to the present invention includes an annular stator core having a plurality of protruding magnetic poles protruding radially at predetermined angular intervals, an insulating cap provided on each protruding magnetic pole so as to cover at least a part of each protruding magnetic pole and holding a stator winding wound around each protruding magnetic pole, and an annular bus bar holder provided at one axial end of the annular stator core and accommodating a bus bar to which the stator winding is connected. Each insulating cap has a coupling portion protruding in the axial direction of the annular stator core, the annular bus bar holder has a protruding portion protruding in the radial direction, and the coupling portion is coupled to the protruding portion.

[0007] Further, the coupling portion of each insulating cap may have a hook-shaped portion, and the hook-shaped portion may be engaged with the protruding portion of the annular bus bar holder. Further, by the annular bus bar holder rotating in the circumferential direction with respect to the insulating cap, the hook-shaped portion of each insulating cap may be engaged with the protruding portion of the annular bus bar holder. Further, the hook-shaped portion may have an axially extending portion extending in the axial direction of the annular stator core and a circumferentially extending portion extending along the circumferential direction of the annular stator core from the tip of the axially extending portion. Further, a rotating electrical machine including the above-described stator structure may be provided.

Advantages of the Invention

[0008] The stator structure according to the present invention includes an insulating cap that holds a stator winding wound around each protruding magnetic pole of an annular stator core, and an annular bus bar holder provided at one axial end of the annular stator core and accommodating a bus bar to which the stator winding is connected. Each insulating cap has a coupling portion protruding in the axial direction of the annular stator core, the annular bus bar holder has a protruding portion protruding in the radial direction, and the coupling portion is coupled to the protruding portion. Therefore, the annular bus bar holder and the insulating cap can be fixed with a small number of man-hours. It can be done.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0010] Hereinafter, a bus bar structure according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view of a stator structure according to the present embodiment. The stator structure 1 is a stator structure of a rotating electric machine such as an AC servo motor, and has an annular stator core 20. The annular stator core 20 has a plurality of protruding magnetic poles protruding at predetermined angular intervals toward the radially inner side. Further, the annular stator core 20 is composed of a plurality of split stator cores arranged along the circumferential direction. An insulating cap 30 is attached to each protruding magnetic pole of the annular stator core 20. A stator winding (not shown) is wound around each insulating cap 30. That is, the insulating cap 30 constitutes an insulating member that insulates the protruding magnetic pole of the annular stator core 20 and the stator winding. In the following description, the circumferential direction, the radial direction, and the axial direction refer to the circumferential direction, the radial direction, and the axial direction of the annular stator core 20, respectively. Further, the rotating electric machine in the present embodiment is not limited to an AC servo motor, and may be any other rotating electric machine.

[0011] On one end side in the axial direction (thrust direction) of the annular stator core 20, a bus bar holder 60 is attached via an insulating cap 30. The bus bar holder 60 is formed in an annular shape and has four groove portions 61 formed concentrically and opening in the direction along the axial direction. Seven bus bars, namely, bus bar 51a, bus bar 51b, bus bar 51c, bus bar 31d, bus bar 31e, bus bar 31f, and bus bar 31g, are inserted and held in each groove portion 61. In the following description, the upper side refers to one end side where the bus bar holder 60 of the annular stator core 20 is attached, and the lower side refers to the other end side of the annular stator core 20. Also, the bus bar holder 60 constitutes an annular bus bar holder. Further, the bus bars held by the bus bar holder 60 may be of any type and shape according to the structure of the rotating electrical machine.

[0012] FIG. 2 is a perspective view of the split stator core of the annular stator core 20 shown in FIG. 1 and the insulating cap 30. The split stator core 21 is formed by laminating a plurality of electromagnetic steel sheets and has a yoke portion 22 extending along the circumferential direction and a protruding pole 23 protruding radially from the yoke portion 22. At the tip of the protruding pole 23, a flange portion 24 extending along the circumferential direction is formed. An insulating cap 30 formed of an insulating resin is attached to the protruding pole 23. The insulating cap 30 is divided into a first insulating cap 31 and a second insulating cap 32 from the intermediate portion in the direction along the axial direction. On the radially outer side of the first insulating cap 31 and the second insulating cap 32, a coupling portion 33 that protrudes in the direction along the axial direction and can be coupled to the bus bar holder 60 (see FIG. 1), which will be described in detail later, is provided. Also, on the radially inner side of the first insulating cap 31 and the second insulating cap 32, a cap flange portion 34 formed so as to cover the flange portion 24 of the split stator core 21 is provided. Further, between the coupling portion 33 and the cap flange portion 34 of the first insulating cap 31 and the second insulating cap 32, a winding winding portion 35 around which the stator winding is wound is formed. Note that the first insulating cap 31 and the second insulating cap 32 according to the present embodiment only need to be formed so as to cover at least the protruding pole 23.

[0013] FIG. 3 is a perspective view of the first insulating cap 31 and the second insulating cap 32 shown in FIG. 2. The first insulating cap 31 and the second insulating cap 32 are formed with fitting portions 36 that can be fitted to overlap each other. As shown in FIG. 2, the insulating cap 30 is attached to the split stator core 21 by overlapping and fitting the fitting portion 36 of the first insulating cap 31 and the fitting portion 36 of the second insulating cap 32 with each other.

[0014] FIG. 4 is a partially enlarged view of the insulating cap 30 and the bus bar holder 60 shown in the figure. The coupling portion 33 of the insulating cap 30 has a hook-shaped portion 37 including an axially extending portion 38 extending along the axial direction and a circumferentially extending portion 39 extending along the circumferential direction from the tip of the axially extending portion 38. The bus bar holder 60 has protruding portions 63 provided on the outer peripheral portion 62 and protruding radially outward at predetermined angular intervals. The angular interval between the coupling portion 33 of the insulating cap 30 in the circumferential direction of the annular stator core 20 and the protruding portion 63 of the bus bar holder 60 is formed to be the same interval. Further, a contact portion 40 extending in the direction along the axial direction is provided so as to be adjacent to the coupling portion 33 of the insulating cap 30. The contact portion 40 is formed to have a shorter length in the direction along the axial direction with respect to the coupling portion 33. Each protruding portion 63 of the bus bar holder 60 is fitted into the gap between the lower side of the circumferentially extending portion 39 and the upper side of the contact portion 40 of each insulating cap 30, and the insulating cap 30 and the bus bar holder 60 are coupled. That is, the hook-shaped portion 37 is engaged with the protruding portion 63.

[0015] Next, a method of assembling the stator structure 1 according to Embodiment 1 will be described. When assembling the stator structure 1, the first insulating cap 31 and the second insulating cap 32 are attached to the split stator core 21 shown in FIG. 2 so as to sandwich the protruding poles 23 from the upper and lower directions, and the fitting portion 36 of the first insulating cap 31 and the fitting portion 36 of the second insulating cap 32 are fitted together. Next, the split stator cores 21 are assembled so that the yoke portions 22 are adjacent to each other to form the annular stator core 20 shown in FIG. 1, and a coil (not shown) is wound around the winding winding portion 35 of the insulating cap 30.

[0016] Next, place the bus bar holder 60 above the annular stator core 20. At this time, place the bus bar holder 60 so that the protruding portion 63 shown in FIG. 4 enters between the joint portions 33 of the adjacent divided stator cores 21. Next, rotate the bus bar holder 60 counterclockwise as viewed from the upper side in the axial direction of the stator structure 1. As a result, the protruding portion 63 of the bus bar holder 60 fits between the lower portion of the circumferential extension portion 39 of the hook-shaped portion 37 of the insulating cap 30 and the upper portion of the contact portion 40, and the bus bar holder 60 is fixed to the insulating cap 30. That is, the contact portion 40 hangs on and engages with the hook-shaped portion 37 of the insulating cap 30, whereby the bus bar holder 60 is fixed to the insulating cap 30. Thereby, the bus bar holder 60 can be fixed to the insulating cap 30 with a small number of man-hours.

[0017] Next, when the bus bars 51a, 51b, 51c, 51d, 51e, 51f, 51e, and 51g are inserted into the groove portion 61 of the bus bar holder 60 shown in FIG. 1, the assembly of the stator structure 1 is completed.

[0018] When removing the bus bar holder 60 from the insulating cap 30, remove the inserted bus bars 51a, 51b, 51c, 51d, 51e, 51f, 51e, and 51g from the groove portion 61 of the bus bar holder 60 shown in FIG. 1. Next, rotate the bus bar holder 60 clockwise as viewed from the upper side in the axial direction of the stator structure 1. As a result, the engagement between the hook-shaped portion 37 of the insulating cap 30 and the protruding portion 63 of the bus bar holder 60 is released, and the bus bar holder 60 can be removed from the insulating cap 30.

[0019] As described above, the stator structure 1 of this embodiment includes an annular stator core 20 having a plurality of protruding magnetic poles 23 protruding radially at predetermined angular intervals, insulating caps 30 respectively provided on each of the protruding magnetic poles 23 so as to cover at least a part of each protruding magnetic pole 23 and holding stator windings wound around each protruding magnetic pole 23, and a bus bar holder 60 provided at one axial end of the annular stator core 20 and accommodating bus bars 51a, 51b, 51c, 51d, 51e, 51f, 51g to which the stator windings are connected. Each insulating cap 30 has a coupling portion 33 protruding in the axial direction of the annular stator core 20, and the bus bar holder 60 has a protruding portion 63 protruding in the radial direction. Since the coupling portion 33 is coupled to the protruding portion 63, the bus bar holder 60 can be fixed to the insulating cap 30 with a small number of man-hours.

[0020] Further, the coupling portion 33 of the insulating cap 30 has a hooked portion 37, and since the hooked portion 37 is engaged with the protruding portion 63 of the bus bar holder 60, the bus bar holder 60 is fixed without moving in the axial direction of the stator structure 1, and the possibility that the stator windings connected to the bus bars 51a, 51b, 51c, 51d, 51e, 51f, 51g are disconnected is reduced.

[0021] Also, when the bus bar holder 60 rotates in the circumferential direction with respect to the insulating cap 30, the hooked portions 37 of the insulating caps 30 are engaged with the protruding portions 63 of the bus bar holder 60, so that the bus bar holder 60 can be easily fixed to the insulating cap 30.

[0022] Further, since the hooked portion 37 has an axially extending portion 38 extending in the axial direction of the annular stator core 20 and a circumferentially extending portion 39 extending along the circumferential direction of the annular stator core 20 from the tip of the axially extending portion 38, the bus bar holder 60 can be fixed to the insulating cap 30 with a simple configuration.

[0023] Also, since the rotating electrical machine of this embodiment includes the stator structure 1 described above, the man-hours required for assembling the rotating electrical machine can be reduced.

[0024] In the present embodiment, the protruding portion 63 of the bus bar holder 60 is fitted into the hook-shaped portion 37 of the insulating cap 30 by rotating the bus bar holder 60 counterclockwise when viewed from the upper side in the axial direction of the stator structure 1. However, by rotating the bus bar holder 60 clockwise when viewed from the upper side in the axial direction of the stator structure 1, the hook-shaped portion 37 may be formed such that the protruding portion 63 of the bus bar holder 60 is fitted into the hook-shaped portion 37 of the insulating cap 30.

[0025] Further, in the present embodiment, the coupling portion 33 of the insulating cap 30 has a hook-shaped portion 37 including an axially extending portion 38 extending along the axial direction and a circumferentially extending portion 39 extending along the circumferential direction from the tip of the axially extending portion 38. However, the shape of the coupling portion 33 is not limited to this shape as long as it can be coupled to the protruding portion 63 of the bus bar holder 60. For example, the shape of the circumferentially extending portion 39 of the coupling portion 33 may be an arc shape instead of a straight line shape.

[0026] Further, in the present embodiment, each protruding portion 63 of the bus bar holder 60 is fitted into the gap between the lower part of each circumferentially extending portion 39 of each insulating cap 30 and the upper part of the contact portion 40, the protruding portion 63 and the circumferentially extending portion 39 are in contact, and the protruding portion 63 and the contact portion 40 are in contact. However, the protruding portion 63 and the circumferentially extending portion 39 may be separated, or the protruding portion 63 and the contact portion 40 may be separated.

[0027] Further, in the present embodiment, the bus bar holder 60 is coupled to the first insulating cap 31, but the bus bar holder 60 may be coupled to the second insulating cap 32.

[0028] As described above, the preferred embodiments and the like have been described in detail. However, the present invention is not limited to the above-described embodiments and the like, and various modifications and substitutions can be made to the above-described embodiments and the like without departing from the scope described in the claims.

[0029] Hereinafter, aspects of the present disclosure will be summarized as appended notes.

[0030] (Appended Note 1) An annular stator core (20) having a plurality of protruding magnetic poles (23) protruding radially at a predetermined angular interval, An insulating cap (30) provided on each of the protruding magnetic poles so as to cover at least a part of each of the protruding magnetic poles (23) and holding a stator winding wound around each of the protruding magnetic poles (23); An annular bus bar holder (60) provided at one axial end of the annular stator core (20) and accommodating bus bars (51a, 51b, 51c, 51d, 51e, 51f, 51g) to which the stator windings are connected Comprising Each of the insulating caps (30) has a coupling portion (33) protruding in the axial direction of the annular stator core (20), The annular bus bar holder (60) has a protruding portion (63) protruding in the radial direction, and the coupling portion (33) is coupled to the protruding portion (63). A stator structure. (Appendix 2) The coupling portion (33) of each of the insulating caps (30) has a hook-shaped portion, and the hook-shaped portion (37) engages with the protruding portion (63) of the annular bus bar holder (60). The stator structure according to Appendix 1. (Appendix 3) When the annular bus bar holder (60) rotates in the circumferential direction with respect to the insulating cap (30), the hook-shaped portion of each of the insulating caps (30) engages with the protruding portion (63) of the annular bus bar holder (60). The stator structure according to Appendix 2. (Appendix 4) The hook-shaped portion (37) has an axially extending portion (38) extending in the axial direction of the annular stator core (20) and a circumferentially extending portion (39) extending along the circumferential direction of the annular stator core (20) from the tip of the axially extending portion (38). The stator structure according to Appendix 2 or 3. (Appendix 5) A rotating electric machine including the stator structure according to any one of Appendices 1 to 4.

Description of Reference Numerals

[0031] 20 Ring-shaped stator core, 23 salient poles, 30 insulating caps, 33 coupling parts, 37 hook-shaped parts, 38 axially extending parts, 39 circumferentially extending parts, 51a, 51b, 51c, 51d, 51e, 51f, 51g busbars, 60 busbar holders (ring-shaped busbar holders), 63 protrusions.

Claims

1. An annular stator core (20) having a plurality of protruding magnetic poles (23) protruding radially at a predetermined angular interval, Insulating caps (30) respectively provided on each of the protruding magnetic poles so as to cover at least a part of each of the protruding magnetic poles (23), and holding stator windings wound around each of the protruding magnetic poles (23), An annular bus bar holder (60) provided at one axial end of the annular stator core (20) and accommodating bus bars (51a, 51b, 51c, 51d, 51e, 51f, 51g) to which the stator windings are connected provided, Each of the insulating caps (30) has a coupling portion (33) protruding in the axial direction of the annular stator core (20), The annular bus bar holder (60) has a protruding portion (63) protruding in the radial direction, and the coupling portion (33) is coupled to the protruding portion (63). A stator structure.

2. The coupling portion (33) of each of the insulating caps (30) has a hook-shaped portion, and the hook-shaped portion (37) engages with the protruding portion (63) of the annular bus bar holder (60). The stator structure according to claim 1.

3. When the annular bus bar holder (60) rotates in the circumferential direction with respect to the insulating cap (30), the hook-shaped portion of each of the insulating caps (30) engages with the protruding portion (63) of the annular bus bar holder (60). The stator structure according to claim 2.

4. The hook-shaped portion (37) has an axially extending portion (38) extending in the axial direction of the annular stator core (20) and a circumferentially extending portion (39) extending along the circumferential direction of the annular stator core (20) from the tip of the axially extending portion (38). The stator structure according to claim 2 or 3.

5. A rotating electrical machine comprising the stator structure according to any one of claims 1 to 3.

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