Rotary electric machine and stator

Abstract

To provide a rotary electric machine 1 and a stator 6 that facilitate manufacture of an insulation member 9.SOLUTION: A rotary electric machine 1 comprises: a rotational shaft; a rotator; a stator core 7; a winding 8; and an insulation member 9. The stator core 7 is formed in an annular shape, and includes: a back yoke 7a with the rotator disposed on its inner peripheral side; and a plurality of teeth 7b arranged at intervals in a circumferential direction of the back yoke 7a. The insulation member 9 is formed in an annular shape, and is disposed in a slot 10, which is a space between adjacent teeth 7b in the circumferential direction. The winding 8 is disposed in an inner peripheral space 10a, which is a space within the slot 10 on the inner peripheral side of the insulation member 9. The insulation member 9 includes an exposed part 9c that is exposed toward the inner peripheral side of the stator core 7 when the insulation member 9 is disposed in the slot 10. A through-hole 9d is formed in the exposed part 9c for communication between the inner peripheral space 10a and an outer peripheral space 11 located on the outer peripheral side of the insulation member 9.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a rotating electrical machine and a stator.

Background Art

[0002] A conventional rotating electrical machine includes insulating paper that insulates a winding inserted into a slot from a stator core. The insulating paper is formed from a laminate of a plurality of insulating sheets. The insulating sheet has through holes formed therein that allow varnish supplied to the winding side to penetrate to the inner wall surface of the slot. The through holes are formed such that when the insulating sheets are laminated, the through holes of adjacent insulating sheets do not overlap (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the insulating paper of the conventional rotating electrical machine described above, it is necessary to form the through holes such that the through holes of adjacent insulating sheets do not overlap when the insulating sheets are laminated. Therefore, there is a problem that it takes time to manufacture insulating members such as insulating paper.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to obtain a rotating electrical machine and a stator that can facilitate the manufacture of insulating members.

Means for Solving the Problems

[0006] The rotating electrical machine according to the present disclosure includes a rotatable shaft, a rotor fixed to the shaft and rotating integrally with the shaft, a back yoke formed in an annular shape with the rotor disposed on the inner peripheral side, and a stator core having a plurality of teeth protruding from the back yoke toward the inner peripheral side of the back yoke and arranged at intervals in the circumferential direction of the back yoke, an insulating member disposed in a slot which is a space between adjacent teeth in the circumferential direction and formed in an annular shape, and a winding disposed in an inner peripheral space which is a space on the inner peripheral side of the insulating member in the slot. The insulating member has an exposed portion that is exposed toward the inner peripheral side of the stator core when the insulating member is disposed in the slot, and a through portion that communicates the inner peripheral space and an outer peripheral space which is a space on the outer peripheral side of the insulating member is formed in the exposed portion.

[0007] The stator according to the present disclosure includes a back yoke formed in an annular shape with the rotor disposed on the inner peripheral side, and a stator core having a plurality of teeth protruding from the back yoke toward the inner peripheral side of the back yoke and arranged at intervals in the circumferential direction of the back yoke, an insulating member disposed in a slot which is a space between adjacent teeth in the circumferential direction and formed in an annular shape, and a winding disposed in an inner peripheral space which is a space on the inner peripheral side of the insulating member in the slot. The insulating member has an exposed portion that is exposed toward the inner peripheral side of the stator core when the insulating member is disposed in the slot, and a through portion that communicates the inner peripheral space and an outer peripheral space which is a space on the outer peripheral side of the insulating member is formed in the exposed portion.

Advantages of the Invention

[0008] The rotating electrical machine and the stator according to the present disclosure can facilitate the manufacture of the insulating member.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0010] Embodiment 1. The rotating electrical machine 1 and the stator 6 according to Embodiment 1 will be described in detail below. In each drawing, the same reference numerals represent the same or corresponding components.

[0011] As shown in FIG. 1, the rotating electrical machine 1 includes a housing 2, a rotating shaft 3, a pair of bearings 4, a rotor 5, and a stator 6. The rotating shaft 3 is rotatably supported by the housing 2 via a pair of bearings 4. Inside the housing 2, a rotor 5 and a stator 6 are provided. The rotor 5 is fixed to the rotating shaft 3 and rotates integrally with the rotating shaft 3. In the following description, the direction in which the rotating shaft 3 extends is also referred to as the axial direction.

[0012] The rotor 5 has a columnar rotor core 5a made of a magnetic material and permanent magnets 5b. The permanent magnets 5b are respectively embedded and fixed in magnet embedding holes (not shown) of the rotor core 5a. Note that the permanent magnets 5b may be attached to the outer peripheral surface of the rotor core 5a. Further, the rotor 5 may be a rotor of an induction motor that does not incorporate magnets.

[0013] As shown in FIG. 2, the stator 6 is arranged with a space so as to surround the rotor 5. The stator 6 has a stator core 7, windings 8, and an insulating member 9. Note that the illustration of the windings 8 and the insulating member 9 is omitted in FIG. 2.

[0014] The stator core 7 is formed in an annular shape. The stator core 7 is formed by laminating thin plates of steel sheets, generally electromagnetic steel sheets, which are press-processed, and connecting them by caulking, welding, adhesion, or the like. The stator core 7 has a back yoke 7a and a plurality of teeth 7b. The back yoke 7a is formed in an annular shape, and the rotor 5 is arranged on the inner peripheral side thereof. The plurality of teeth 7b project from the back yoke 7a toward the inner peripheral side of the back yoke 7a and are arranged at intervals in the circumferential direction of the back yoke 7a. The space between adjacent teeth 7b in the circumferential direction of the back yoke 7a is called a slot 10. In the following description, the circumferential direction of the stator core 7 is also simply called the circumferential direction, and the radial direction of the stator core 7 is also simply called the radial direction. Note that the circumferential direction of the stator core 7 is the same as the circumferential direction of the back yoke 7a, and the radial direction of the stator core 7 is the same as the radial direction of the back yoke 7a.

[0015] As shown in FIG. 3, the windings 8 are inserted into an inner peripheral space 10a, which will be described later, from the axial direction and wound around the teeth 7b via the insulating member 9. When the windings 8 are wound around the teeth 7b, a part of the windings 8 is arranged in the inner peripheral space 10a. Note that the windings 8 may be concentrated windings or distributed windings. Further, as shown in FIG. 4, the windings 8 may be arranged with a space from an exposed portion 9c in which a through portion 9d, which will be described later, is formed.

[0016] The insulating member 9 insulates the windings 8 and the stator core 7. The insulating member 9 is, for example, insulating paper. The insulating paper may be formed by laminating a plurality of insulating sheets or may be formed from a single insulating sheet. The insulating member 9 is formed in an annular shape along the back yoke 7a and the teeth 7b and is arranged in the slot 10. The space on the inner peripheral side of the insulating member 9 in the slot 10 is called an inner peripheral space 10a. Note that a resin molded product may be used as the insulating member 9.

[0017] The insulating member 9, which is an insulating paper or the like, has a polymerized portion 9a where the insulating members 9 overlap when the insulating member 9 is formed in a ring shape, and a non-polymerized portion 9b where the insulating members 9 do not overlap when the insulating member 9 is formed in a ring shape. When the insulating member 9 is disposed in the slot 10, a part of the polymerized portion 9a faces the back yoke 7a in the radial direction, and a part of the non-polymerized portion 9b faces the teeth 7b in the circumferential direction.

[0018] The non-polymerized portion 9b has an exposed portion 9c that is exposed toward the inner peripheral side of the stator core 7 when the insulating member 9 is disposed in the slot 10. The exposed portion 9c is not covered by the stator core 7. The inner peripheral side of the stator core 7 is the side of the stator core 7 that is close to the rotor 4.

[0019] As shown in FIG. 5, a through hole 9d is formed in the exposed portion 9c. The through hole 9d is a hole that communicates the inner peripheral space 10a and the outer peripheral space 11, which is the space on the outer peripheral side of the insulating member 9. In FIG. 5, the range surrounded by the dotted line is the inner peripheral space 10a, and the range surrounded by the alternate long and short dash line is the outer peripheral space 11. The space on one side of the center of the inner peripheral space 10a in the axial direction is called the first space 10b, and the space on the other side of the center of the inner peripheral space 10a in the axial direction is called the second space 10c. Note that the winding 8 is not shown in FIG. 5.

[0020] A plurality of through holes 9d are formed in the insulating member 9 at different positions in the axial direction with a predetermined interval therebetween. The predetermined interval is the distance between the through holes 9d necessary to prevent the resin that has passed through the through holes 9d from being biased to a part of the inner peripheral space 10a when injecting the resin into the inner peripheral space 10a, which will be described later. When forming three or more through holes 9d, it is not necessary to make the intervals between the through holes 9d equal.

[0021] The insulating member 9 is formed with, for example, three through-holes 9e - 9g. One of the three through-holes 9e communicates the first space 10b with the outer peripheral space 11. Another one of the three through-holes 9g communicates the second space 10c with the outer peripheral space 11. When not distinguishing between the through-holes 9e - 9g for explanation, they are called through-hole 9d.

[0022] The insulating member 9 is cut out into a predetermined shape and formed into an annular shape, and then the through-hole 9d is formed by a cutting tool such as a cutter. Note that after the insulating member 9 is cut out into a predetermined shape and the through-hole 9d is formed, the insulating member 9 may be formed into an annular shape. Thereafter, the insulating member 9 is disposed in the slot 10.

[0023] Also, in the axial direction, the length of the insulating member 9 is longer than the length of the stator core 7. Therefore, when the insulating member 9 is disposed in the slot 10, the insulating member 9 protrudes axially with respect to the stator core 7. Specifically, a part of the insulating member 9 protrudes upward in the plane of FIG. 5 with respect to the stator core 7, and a part of the insulating member 9 protrudes downward in the plane of FIG. 5 with respect to the stator core 7.

[0024] Next, the resin injection process will be described. There is a possibility that the winding 8 and the stator core 7 vibrate due to the electromagnetic force generated when the winding 8 is energized. Therefore, by injecting and curing varnish, which is a resin, into the slot 10, the relative positions of the stator core 7, the winding 8, and the insulating member 9 are fixed.

[0025] With the insulating member 9 disposed in the slot 10 and the winding 8 disposed in the inner peripheral space 10a, resin is injected. The resin is injected from the inner peripheral side to the outer peripheral side of the stator core 7. Therefore, the resin is injected into the inner peripheral space 10a through the through-hole 9d from the outer peripheral space 11.

[0026] As the resin is filled between the winding 8 and the insulating member 9, and between the insulating member 9 and the stator core 7, the relative positions of the stator core 7, the winding 8, and the insulating member 9 are fixed as the resin cures.

[0027] By fixing the relative positions of the stator core 7, the winding 8, and the insulating member 9, it is possible to prevent the windings 8 from rubbing against each other or the insulating member 9 from rubbing against the winding 8 or the stator core 7 due to vibration and being damaged. Further, since the resin is filled between the winding 8 and the insulating member 9 and between the insulating member 9 and the stator core 7, the heat generated in the winding 8 during the operation of the rotating electrical machine 1 is easily dissipated to the stator core 7 through the resin.

[0028] In the prior art, when a through hole for injecting resin is formed in the portion of the insulating member 9 covered by the stator core 7, the insulation distance between the winding 8 and the stator core 7 becomes short, and the insulation performance of the insulating member 9 deteriorates. Therefore, in order to suppress the deterioration of the insulation performance of the insulating member 9, it is also conceivable to use insulating paper formed by laminating a plurality of insulating sheets as the insulating member 9 and to form the through holes so that the through holes of the adjacent insulating sheets do not overlap when the insulating sheets are laminated. However, in this case, the structure of the insulating paper becomes complicated and its manufacture is time-consuming.

[0029] On the other hand, in the rotating electrical machine 1 and the stator 6 according to such Embodiment 1, a through portion 9d that communicates the inner peripheral space 10a and the outer peripheral space 11 is formed in the exposed portion 9c of the insulating member 9. Therefore, it is possible to suppress a reduction in the insulation distance between the winding 8 and the stator core 7, and it is possible to suppress a deterioration in the insulation performance of the insulating member 9. Further, it is possible to suppress the structure of the insulating member 9 from becoming complicated, and it is possible to facilitate the manufacture of the insulating member 9.

[0030] Furthermore, in the rotating electrical machine 1 and the stator 6 according to such Embodiment 1, the insulating member 9 is formed in an annular shape. Such an insulating member 9 can more reliably insulate the winding 8 and the stator core 7 as compared with the insulating member 9 that opens toward the inner peripheral side of the stator core 7.

[0031] Furthermore, in the rotating electrical machine 1 and the stator 6 according to such Embodiment 1, a plurality of through portions 9d are formed in the insulating member 9. Therefore, it is easy to inject resin into the inner peripheral space 10a.

[0032] Furthermore, in the rotating electrical machine 1 and the stator 6 according to such Embodiment 1, a plurality of through-holes 9d are formed at different positions in the axial direction with a predetermined interval therebetween. Therefore, when the resin passes through the through-holes 9d and is injected into the inner peripheral space 10a, it is possible to suppress the resin from being biased to a part of the inner peripheral space 10a.

[0033] Furthermore, in the rotating electrical machine 1 and the stator 6 according to such Embodiment 1, the through-hole 9e communicates the first space 10b and the outer peripheral space 11, and the through-hole 9g communicates the second space 10c and the outer peripheral space 11. Therefore, when the resin passes through the through-holes 9e and 9g and is injected into the inner peripheral space 10a, it is possible to suppress the resin from being biased to a part of the inner peripheral space 10a.

[0034] Furthermore, in the rotating electrical machine 1 and the stator 6 according to such Embodiment 1, the through-hole 9d is formed in the exposed portion 9c of the non-polymerized portion 9b. As shown in FIG. 6, when the polymerized portion 9a has the exposed portion 9c and the through-hole 9d is formed therein, it is laborious because it is substantially necessary to form the through-hole 9d in two insulating members 9. On the other hand, when the through-hole 9d is formed in the non-polymerized portion 9b, the through-hole 9d can be easily formed because it is only necessary to form the through-hole 9d in one insulating member 9. Further, as shown in FIG. 7, the positions of the overlapping insulating members 9 may be displaced in the polymerized portion 9a. In this case, the through-hole 9d formed in the polymerized portion 9a is blocked or the size becomes small, so that it becomes difficult for the resin to pass through the through-hole 9d and it becomes difficult for the resin to be injected into the inner peripheral space 10a. On the other hand, when the through-hole 9d is formed in the non-polymerized portion 9b, it is possible to suppress the injection of the resin from being hindered because the through-hole 9d is not blocked or the size does not become small due to the displacement of the position of the insulating member 9.

[0035] Furthermore, in the rotating electrical machine 1 and the stator 6 according to such Embodiment 1, the winding 8 is arranged with a space from the exposed portion 9c in which the through-hole 9d is formed. Therefore, since the through-hole 9d is not blocked by the winding 8, the resin that has passed through the through-hole 9d easily flows into the inner peripheral space 10a.

[0036] Furthermore, in the rotating electrical machine 1 and the stator 6 according to such Embodiment 1, when the insulating member 9 is disposed in the slot 10, the insulating member 9 protrudes axially more than the stator core 7. Therefore, the winding 8 is suppressed from approaching the stator core 7 from the axial direction, and the insulation distance between the winding 8 and the stator core 7 can be maintained.

[0037] In addition, when a resin molded product is used as the insulating member 9, it may be formed in a ring shape only with the non-polymerized portion 9b without having the polymerized portion 9a.

[0038] Although the example in which the polymerized portion 9a faces the back yoke 7a in the radial direction has been described, the polymerized portion 9a may face the teeth 7b in the circumferential direction. Similarly, although the example in which the non-polymerized portion 9b faces the teeth 7b in the circumferential direction has been described, the non-polymerized portion 9b may face the back yoke 7a in the radial direction.

[0039] The insulating member 9 does not necessarily protrude axially more than the stator core 7. In this case, the stator core 7 has two insulating plates that cover the surfaces on both sides of the back yoke 7a and the teeth 7b in the axial direction. In the axial direction, the length of the insulating member 9 may be longer than the lengths of the back yoke 7a and the teeth 7b and may be a length that contacts the two insulating plates. In this way, the insulation distance between the winding 8 and the stator core 7 may be maintained by the insulating member 9 and the insulating plates.

[0040] As shown in FIG. 8, at least three through holes 9d formed in the insulating member 9 do not have to be arranged on the same straight line. By not arranging the through holes 9d on the same straight line, the insulating member 9 can be suppressed from breaking along the through holes 9d.

[0041] In addition, the through hole 9d may be one.

[0042] Although the example in which the through portion 9d is a hole has been described, as shown in FIG. 9, the through portion 9d may be a notch that communicates the inner peripheral space 10a and the outer peripheral space 11. When the through portion 9d is a notch, since no cutting chips are generated by processing, it is possible to suppress the entry of cutting chips into the housing 2 during the assembly of the rotating electric machine 1.

[0043] As shown in FIG. 10, when a part of the tip of the inner peripheral side of the stator core 7 among the teeth 7b protrudes in the circumferential direction, the through portion 9d may be formed so that a part of the teeth 7b is not blocked by the through portion 9d.

[0044] In the resin injection step, the relative positions of the stator core 7, the winding 8, and the insulating member 9 may be fixed by a resin mold that fills the slot 10 with resin without gaps.

[0045] In the resin injection step, the stator 6 may be immersed in resin in order to inject resin into the inner peripheral space 10a.

[0046] Hereinafter, aspects of the present disclosure will be summarized and described as appendices. (Appendix 1) A rotatable support shaft, A rotor fixed to the rotating shaft and rotating integrally with the rotating shaft, A back yoke formed in an annular shape, with the rotor disposed on the inner peripheral side, and a stator core having a plurality of teeth protruding from the back yoke toward the inner peripheral side of the back yoke and arranged at intervals in the circumferential direction of the back yoke, An insulating member formed in an annular shape and disposed in a slot that is a space between the adjacent teeth in the circumferential direction, A winding disposed in an inner peripheral space that is a space on the inner peripheral side of the insulating member among the slots, Comprising The insulating member has an exposed portion that is exposed toward the inner peripheral side of the stator core when the insulating member is disposed in the slot, A rotating electrical machine in which a through-hole is formed in the exposed portion to communicate the inner peripheral space with an outer peripheral space which is a space on the outer peripheral side of the insulating member. (Appendix 2) The rotating electrical machine according to Appendix 1, wherein a plurality of the through-holes are formed in the insulating member at different positions in the axial direction of the rotating shaft with a predetermined interval therebetween. (Appendix 3) One of the plurality of through-holes communicates the first space, which is a space on one side of the center of the inner peripheral space in the axial direction, with the outer peripheral space, The rotating electrical machine according to Appendix 2, wherein another one of the plurality of through-holes communicates the second space, which is a space on the other side of the center of the inner peripheral space in the axial direction, with the outer peripheral space. (Appendix 4) The insulating member has a non-overlapping portion where the insulating member does not overlap when the insulating member is formed in an annular shape, The rotating electrical machine according to any one of Appendices 1 to 3, wherein the through-hole is formed in the non-overlapping portion. (Appendix 5) The rotating electrical machine according to any one of Appendices 1 to 4, wherein the winding is arranged with a space from the exposed portion in which the through-hole is formed. (Appendix 6) At least three through-holes are formed in the insulating member, The rotating electrical machine according to any one of Appendices 1 to 5, wherein at least three of the through-holes are not arranged on the same straight line. (Appendix 7) The rotating electrical machine according to any one of Appendices 1 to 6, wherein when the insulating member is arranged in the slot, the insulating member protrudes in the axial direction of the rotating shaft from the stator core. (Appendix 8) A back yoke formed in an annular shape with a rotor arranged on the inner peripheral side, and a stator core having a plurality of teeth protruding from the back yoke toward the inner peripheral side of the back yoke and arranged at intervals in the circumferential direction of the back yoke, An insulating member formed in an annular shape and arranged in a slot which is a space between the adjacent teeth in the circumferential direction. A winding disposed in an inner peripheral space, which is a space on the inner peripheral side of the insulating member among the slots, and comprises The insulating member has an exposed portion that is exposed toward the inner peripheral side of the stator core when the insulating member is disposed in the slot, A stator in which a through-hole is formed in the exposed portion to communicate the inner peripheral space and an outer peripheral space, which is a space on the outer peripheral side of the insulating member.

Explanation of Signs

[0047] 1 Rotating electrical machine, 3 Rotating shaft, 5 Rotor, 6 Stator, 7 Stator core, 8 Winding, 9 Insulating member, 9b Non-overlapping portion, 9c Exposed portion, 9d Through-hole, 10 Slot, 10a Inner peripheral space, 10b First space, 10c Second space, 11 Outer peripheral space

Claims

1. A rotatable shaft rotatably supported, A rotor fixed to the rotatable shaft and rotating integrally with the rotatable shaft, A back yoke formed in an annular shape with the rotor disposed on the inner peripheral side thereof, and a stator core having a plurality of teeth protruding from the back yoke toward the inner peripheral side of the back yoke and spaced apart in the circumferential direction of the back yoke, An insulating member formed in an annular shape and disposed in a slot which is a space between the adjacent teeth in the circumferential direction, A winding disposed in an inner peripheral space which is a space on the inner peripheral side of the insulating member among the slots, Comprising, The insulating member has an exposed portion that is exposed toward the inner peripheral side of the stator core when the insulating member is disposed in the slot, A rotating electrical machine in which a through hole communicating the inner peripheral space and an outer peripheral space which is a space on the outer peripheral side of the insulating member is formed in the exposed portion.

2. The rotating electrical machine according to claim 1, wherein a plurality of the through holes are formed in the insulating member at predetermined intervals at different positions in the axial direction of the rotatable shaft.

3. One of the plurality of through holes communicates a first space which is a space on one side from the center of the inner peripheral space in the axial direction and the outer peripheral space, The rotating electrical machine according to claim 2, wherein the other one of the plurality of through holes communicates a second space which is a space on the other side from the center of the inner peripheral space in the axial direction and the outer peripheral space.

4. The insulating member has a non-overlapping portion where the insulating member does not overlap when the insulating member is formed in an annular shape, The rotating electrical machine according to any one of claims 1 to 3, wherein the through hole is formed in the non-overlapping portion.

5. The rotating electrical machine according to any one of claims 1 to 3, wherein the winding is disposed with a space from the exposed portion in which the through hole is formed.

6. At least three of the through holes are formed in the insulating member, The rotating electrical machine according to any one of claims 1 to 3, wherein at least three of the through holes are not arranged in a straight line.

7. The rotating electrical machine according to any one of claims 1 to 3, wherein when the insulating member is disposed in the slot, the insulating member protrudes in the axial direction of the rotatable shaft more than the stator core.

8. A back yoke formed in an annular shape with a rotor disposed on the inner peripheral side, and a stator core having a plurality of teeth that project from the back yoke toward the inner peripheral side of the back yoke and are arranged at intervals in the circumferential direction of the back yoke; An insulating member formed in an annular shape and disposed in a slot that is a space between the adjacent teeth in the circumferential direction; A winding disposed in an inner peripheral space that is a space on the inner peripheral side of the insulating member among the slots; Comprising; The insulating member has an exposed portion that is exposed toward the inner peripheral side of the stator core when the insulating member is disposed in the slot; A stator in which a through-hole that communicates the inner peripheral space and an outer peripheral space that is a space on the outer peripheral side of the insulating member is formed in the exposed portion.

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