Stator

Abstract

To provide a stator capable of increasing a coil cooling effect.SOLUTION: A motor comprises: a stator core 30 which has a cylindrical yoke 31 and a plurality of teeth 32 extending from an inner peripheral surface of the yoke 31 and arranged at intervals in a circumferential direction of the yoke 31; a coil 40 which is wound around the teeth 32; and two insulation parts 52 which are arranged between the coils 40 adjoining each other in the circumferential direction of the yoke 31 and which are juxtaposed at an interval in the circumferential direction of the yoke 31. Each of the insulation parts 52 is provided with through-holes 52a.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a stator. [Background technology]

[0002] The motor described in Patent Document 1 includes a stator having a stator core, a coil, and an inter-coil insulator. The stator core has a cylindrical yoke and a plurality of teeth. The teeth extend from an inner peripheral surface of the yoke and are arranged at intervals in the circumferential direction of the yoke. The coils are wound around the teeth. The inter-coil insulator is arranged between adjacent coils in the circumferential direction of the yoke. The inter-coil insulator has a pair of inter-coil insertion portions arranged at an interval in the circumferential direction of the yoke. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-17972 A Summary of the Invention [Problem to be solved by the invention]

[0004] To cool the coils, refrigerant gas is sometimes passed through the housing that contains the stator. As the refrigerant gas passes between adjacent coils in the circumferential direction of the yoke, it exchanges heat with the coils, thereby cooling the coils. In this case, the refrigerant gas passing between a pair of inter-coil insertion portions does not come into contact with the coils. Therefore, the cooling effect of the refrigerant gas passing between the pair of inter-coil insertion portions on the coils is small. [Means for solving the problem]

[0005] The stator for solving the above problems comprises a stator core having a cylindrical yoke and a plurality of teeth extending from the inner or outer peripheral surface of the yoke and arranged at intervals in the circumferential direction of the yoke, coils wound around the teeth, and a plurality of insulating parts arranged between adjacent coils in the circumferential direction of the yoke and spaced apart in the circumferential direction of the yoke, wherein each of the insulating parts has a through hole.

[0006] According to the above configuration, the refrigerant gas passing between the insulating parts adjacent in the circumferential direction of the yoke passes through the through holes and flows between the coil and the insulating parts, thereby exchanging heat with the coil. This increases the cooling effect of the coil by the refrigerant gas passing between the insulating parts. In addition, the refrigerant gas is more likely to become turbulent between the coils adjacent in the circumferential direction of the yoke. This increases the amount of heat exchanged between the refrigerant gas and the coil. This increases the cooling effect of the coil.

[0007] In the above stator, the through holes may be arranged in an axial direction of the yoke. According to the above-described configuration, the refrigerant gas passes between adjacent coils in the circumferential direction of the yoke while moving between the insulating parts and between the insulating parts and the coils, thereby further increasing the cooling effect of the coils.

[0008] In the above stator, in the insulating portions adjacent to each other in the circumferential direction of the yoke, the through holes provided in one insulating portion and the through holes provided in the other insulating portion may be arranged alternately in the axial direction of the yoke.

[0009] With this configuration, the refrigerant gas flows more easily in a direction intersecting the axial direction of the yoke than when the through hole in one insulating part and the through hole in the other insulating part are located at the same position in the axial direction of the yoke, thereby further increasing the cooling effect of the coil.

[0010] In the above stator, the interval between adjacent insulating portions in a circumferential direction of the yoke may vary in an axial direction of the yoke. With this configuration, compared to a case where the interval between adjacent insulating parts in the circumferential direction of the yoke is constant in the axial direction of the yoke, refrigerant gas can more easily flow between the insulating parts and between the insulating parts and the coil, or between the insulating parts and the coil and between the insulating parts, thereby further increasing the cooling effect of the coil. Effect of the Invention

[0011] According to the present invention, the cooling effect of the coil can be increased. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a cross-sectional view showing a motor according to an embodiment. [Diagram 2] FIG. 2 is a front view showing the stator of the embodiment. [Diagram 3] FIG. 3 is a development view showing insulating plates constituting two insulating parts of the embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing the stator of the embodiment. [Diagram 5] FIG. 5 is a cross-sectional view showing two insulating parts of the modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, one embodiment of a stator will be described with reference to Figures 1 to 4. The stator of this embodiment is used in a motor. <Motor> As shown in FIG. 1, the motor 10 includes a housing 11, a rotor 12, a rotating shaft 13, and a stator 14.

[0014] The housing 11 includes a housing body 21 and a cover 22. The housing body 21 is cylindrical with a bottom. The housing body 21 has a disk-shaped bottom wall 21a and a cylindrical peripheral wall 21b extending from the outer periphery of the bottom wall 21a. The cover 22 closes the opening of the housing body 21. An accommodation chamber S that accommodates the rotor 12, the rotating shaft 13, and the stator 14 is defined by the inner surfaces of the housing body 21 and the cover 22.

[0015] The housing body 21 is provided with a refrigerant inlet 11a for introducing refrigerant gas into the storage chamber S from outside the housing 11. In this embodiment, the refrigerant inlet 11a is provided in the bottom wall 21a. The cover 22 is provided with a refrigerant outlet 11b for discharging the refrigerant gas from inside the storage chamber S to outside the housing 11. The refrigerant gas is, for example, freon or air.

[0016] The rotor 12 has a cylindrical rotor core 12a and a permanent magnet (not shown). The rotating shaft 13 is inserted through the rotor core 12a. The rotating shaft 13 is fixed to the rotor core 12a. The rotating shaft 13 rotates integrally with the rotor core 12a. Both ends of the rotating shaft 13 are rotatably supported by the housing 11 via bearings 16. The axial direction of the rotor core 12a and the axial direction of the rotating shaft 13 coincide with the axial direction of the peripheral wall 21b. The stator 14 is disposed outside the rotor 12. In other words, the motor 10 of this embodiment is an inner rotor type motor in which the rotor 12 is disposed inside the stator 14.

[0017] <Stator> As shown in FIG. 2, the stator 14 includes a stator core 30 , a plurality of coils 40 , and an insulating portion 52 .

[0018] The stator core 30 includes a cylindrical yoke 31 and a plurality of teeth 32 . 1, the axial direction of the yoke 31 coincides with the axial direction of the peripheral wall 21b of the housing body 21. The outer peripheral surface of the yoke 31 is fixed to the inner peripheral surface of the peripheral wall 21b. Thus, the stator 14 is fixed to the housing 11.

[0019] 2, each of the teeth 32 extends from the inner circumferential surface of the yoke 31 toward the center of the yoke 31. The teeth 32 are arranged at intervals in the circumferential direction of the yoke 31.

[0020] Each coil 40 is wound around a tooth 32. An insulator (not shown) is provided between the coil 40 and the tooth 32. The insulator insulates the coil 40 from the tooth 32. Each coil 40 has a pair of coil main portions 41 located on either side of the tooth 32 in the circumferential direction of the yoke 31, and a pair of coil ends 42 located on either side of the tooth 32 in the axial direction of the yoke 31.

[0021] <Insulation section> The insulating portion 52 of the present embodiment is disposed inside the yoke 31. The insulating portion 52 extends in the axial direction of the yoke 31. Two insulating portions 52 are disposed between the coils 40 adjacent to each other in the circumferential direction of the yoke 31.

[0022] Of the two insulating parts 52, one insulating part 52 faces one of the coils 40 adjacent in the circumferential direction of the yoke 31. The other insulating part 52 faces the other of the coils 40 adjacent in the circumferential direction of the yoke 31. The two insulating parts 52 insulate the coils 40 adjacent in the circumferential direction of the yoke 31. A gap is provided between each insulating part 52 and the coils 40.

[0023] The two insulating parts 52 are arranged side by side with a gap therebetween in the circumferential direction of the yoke 31. In this embodiment, the gap between two insulating parts 52 adjacent to each other in the circumferential direction of the yoke 31 gradually narrows from the radially inner side to the radially outer side of the yoke 31. The two insulating parts 52 in this embodiment are arranged in a V-shape. An end of one insulating part 52 located on the radially outer side of the yoke 31 and an end of the other insulating part 52 located on the radially outer side of the yoke 31 are connected to each other.

[0024] 3, the two insulating parts 52 in this embodiment are formed by bending a single insulating plate 50 along a folding line L. A portion of the insulating plate 50 located on one side of the folding line L becomes one of the two insulating parts 52. A portion of the insulating plate 50 located on the other side of the folding line L becomes the other of the two insulating parts 52.

[0025] As shown in FIG. 4, in this embodiment, the interval between two insulating portions 52 adjacent to each other in the circumferential direction of the yoke 31 is constant in the axial direction of the yoke 31. As shown in FIG. 3 and FIG. 4, each insulating part 52 has a plurality of through holes 52a. Each through hole 52a in this embodiment is a round hole. The plurality of through holes 52a are arranged in the axial direction of the yoke 31. The through hole 52a provided in one insulating part 52 and the through hole 52a provided in the other insulating part 52 are arranged at different positions in the axial direction of the yoke 31. The through hole 52a provided in one insulating part 52 and the through hole 52a provided in the other insulating part 52 are arranged alternately in the axial direction of the yoke 31. The through hole 52a provided in one insulating part 52 faces a part of the other insulating part 52 where the through hole 52a is not provided. In addition, the through hole 52a provided in the other insulating part 52 faces a part of the one insulating part 52 where the through hole 52a is not provided. Therefore, at least one insulating part 52 is interposed between the coils 40 adjacent to each other in the circumferential direction of the yoke 31. This ensures insulation between the coils 40 adjacent to each other in the circumferential direction of the yoke 31.

[0026] [Operation of this embodiment] The operation of this embodiment will now be described. The refrigerant gas is introduced into the storage chamber S from the refrigerant inlet 11a. The refrigerant gas introduced into the storage chamber S passes between the coils 40 adjacent to each other in the circumferential direction of the yoke 31. Two insulating parts 52 are arranged between the coils 40 adjacent to each other in the circumferential direction of the yoke 31. A part of the refrigerant gas flows between the coil 40 and the insulating part 52, thereby exchanging heat with the coil 40. In addition, a part of the refrigerant gas flows between the two insulating parts 52. Each insulating part 52 is provided with a through hole 52a. Therefore, the refrigerant gas that flows between the two insulating parts 52 flows between the coil 40 and the insulating part 52 by passing through the through hole 52a, thereby exchanging heat with the coil 40. Since each insulating part 52 is provided with the through hole 52a in this way, not only the refrigerant gas that flows between the insulating part 52 and the coil 40, but also the refrigerant gas that flows between the two insulating parts 52 contributes to cooling the coil 40. Therefore, the cooling effect of the coil 40 is increased.

[0027] For example, if the insulating parts 52 do not have the through holes 52a, the refrigerant gas flows linearly between the insulating parts 52 and the coil 40 and between the two insulating parts 52 along the axial direction of the yoke 31. Therefore, the refrigerant gas is less likely to become turbulent between the coils 40 adjacent in the circumferential direction of the yoke 31. In contrast, in this embodiment, the through holes 52a are provided in each insulating part 52, so that the refrigerant gas is more likely to become turbulent between the coils 40 adjacent in the circumferential direction of the yoke 31. In general, the heat exchange amount Q is proportional to the heat transfer coefficient h. The heat transfer coefficient h increases as the gas becomes more turbulent. Therefore, as in this embodiment, the refrigerant gas is more likely to become turbulent between the coils 40 adjacent in the circumferential direction of the yoke 31, so that the heat exchange amount Q between the coils 40 and the refrigerant gas increases. This also increases the cooling effect of the coils 40.

[0028] Furthermore, in this embodiment, the through holes 52a provided in each insulating portion 52 are arranged in the axial direction of the yoke 31. Therefore, the refrigerant gas passes between the coils 40 adjacent to each other in the circumferential direction of the yoke 31 while moving between the coil 40 and the insulating portion 52 and between the two insulating portions 52, for example, as shown by the arrows in Fig. 4. This further increases the cooling effect of the coil 40.

[0029] The refrigerant gas flows between the coils 40 adjacent to each other in the circumferential direction of the yoke 31, and is then discharged to the outside of the accommodation chamber S from the refrigerant outlet 11b. [Effects of this embodiment] The effects of this embodiment will be described.

[0030] (1) Between the coils 40 adjacent in the circumferential direction of the yoke 31, two insulating parts 52 are provided, which are spaced apart from each other in the circumferential direction of the yoke 31. Each of the two insulating parts 52 is provided with a through hole 52a. According to this configuration, the refrigerant gas passing between the insulating parts 52 adjacent in the circumferential direction of the yoke 31 flows between the coil 40 and the insulating part 52 by passing through the through hole 52a, and exchanges heat with the coil 40. Therefore, the cooling effect of the coil 40 by the refrigerant gas passing between the insulating parts 52 is increased. In addition, the refrigerant gas is easily turbulent between the coils 40 adjacent in the circumferential direction of the yoke 31. Therefore, the amount of heat exchange between the refrigerant gas and the coil 40 is increased. Therefore, the cooling effect of the coil 40 is increased.

[0031] (2) In each insulating portion 52, the through holes 52a are arranged in the axial direction of the yoke 31. With this configuration, the refrigerant gas passes between the coils 40 adjacent to each other in the circumferential direction of the yoke 31 while moving between the two insulating portions 52 and between the insulating portion 52 and the coil 40. This further increases the cooling effect of the coil 40.

[0032] (3) In the two insulating parts 52, the through holes 52a provided in one insulating part 52 and the through holes 52a provided in the other insulating part 52 are arranged alternately in the axial direction of the yoke 31. With this configuration, the refrigerant gas flows more easily in a direction intersecting the axial direction of the yoke 31 than when the through holes 52a provided in one insulating part 52 and the through holes 52a provided in the other insulating part 52 are arranged at the same position in the axial direction of the yoke 31. Therefore, the cooling effect of the coil 40 is further increased. In addition, at least one insulating part 52 is interposed between the coils 40 adjacent to each other in the circumferential direction of the yoke 31. Therefore, insulation between the coils 40 adjacent to each other in the axial direction of the yoke 31 can be ensured.

[0033] (4) The coil main portion 41 is located between the teeth 32 in the circumferential direction of the yoke 31, and is therefore more difficult to cool than the coil ends 42. In this embodiment, by providing the through holes 52a in the insulating portions 52 that are disposed between the coils 40 adjacent to each other in the circumferential direction of the yoke 31, the coil main portion 41, which is difficult to cool, can also be cooled.

[0034] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0035] Between adjacent coils 40 in the circumferential direction of the yoke 31, three or more insulating portions 52 may be arranged at intervals in the circumferential direction of the yoke 31. In this case, each insulating portion 52 is also provided with a through hole 52a.

[0036] The shape, number, and size of the through holes 52a provided in each insulating portion 52 may be changed as appropriate. The arrangement of the through holes 52a in each insulating portion 52 may be changed as appropriate.

[0037] For example, the through holes 52a arranged in the axial direction of the yoke 31 may be arranged in multiple rows in the radial direction of the yoke 31. For example, as long as insulation between adjacent coils 40 in the circumferential direction of the yoke 31 is ensured, the through hole 52a provided in one insulating portion 52 and the through hole 52a provided in the other insulating portion 52 may be positioned at the same position in the axial direction of the yoke 31.

[0038] In the above embodiment, the interval between adjacent insulating portions 52 in the circumferential direction of the yoke 31 gradually narrows from the radial inner side to the radial outer side of the yoke 31, but this is not limited to the above. The interval between adjacent insulating portions 52 in the circumferential direction of the yoke 31 may widen from the radial inner side to the radial outer side of the yoke 31, or may be constant in the radial direction of the yoke 31.

[0039] The insulating portions 52 arranged between adjacent coils 40 in the circumferential direction of the yoke 31 may each be a separate member. The distance between adjacent insulating portions 52 in the circumferential direction of the yoke 31 may vary in the axial direction of the yoke 31 .

[0040] 5, the interval between adjacent insulating portions 52 in the circumferential direction of the yoke 31 may become narrower from the refrigerant inlet 11a side toward the refrigerant outlet 11b side in the axial direction of the yoke 31. In this case, refrigerant gas flows more easily between the two insulating portions 52 and between the insulating portions 52 and the coil 40, compared to when the interval between adjacent insulating portions 52 in the circumferential direction of the yoke 31 is constant in the axial direction of the yoke 31. This further increases the cooling effect of the coil 40.

[0041] The interval between adjacent insulating portions 52 in the circumferential direction of the yoke 31 may become wider from the refrigerant inlet 11a side toward the refrigerant outlet 11b side in the axial direction of the yoke 31. In this case, the refrigerant gas flows more easily between the insulating portion 52 and the coil 40 to between the two insulating portions 52, compared to when the interval between adjacent insulating portions 52 in the circumferential direction of the yoke 31 is constant in the axial direction of the yoke 31. This further increases the cooling effect of the coil 40.

[0042] Among the ends of each insulating portion 52 in the axial direction of yoke 31, the ends on the side where the spacing between insulating portions 52 is narrower may be separated from each other as shown in FIG. 5, or may be in contact with each other.

[0043] The motor 10 may be an outer rotor type motor in which the rotor 12 is disposed outside the stator 14. In this case, the teeth 32 extend from the outer circumferential surface of the yoke 31. [Explanation of symbols]

[0044] 14... stator, 30... stator core, 31... yoke, 32... teeth, 40... coil, 52... insulating portion, 52a... through hole.

Claims

1. a stator core having a cylindrical yoke and a plurality of teeth extending from an inner circumferential surface or an outer circumferential surface of the yoke and spaced apart in a circumferential direction of the yoke; A coil wound around the tooth; a plurality of insulating portions disposed between adjacent coils in a circumferential direction of the yoke and arranged at intervals in the circumferential direction of the yoke; A stator comprising: A stator comprising: a first insulating portion and a second insulating portion, the first insulating portion and the second insulating portion being electrically connected to each other;

2. The stator according to claim 1 , wherein the through holes are arranged in an axial direction of the yoke.

3. 3. The stator according to claim 2, wherein in the insulating portions adjacent to each other in the circumferential direction of the yoke, the through holes provided in one insulating portion and the through holes provided in the other insulating portion are arranged alternately in the axial direction of the yoke.

4. 4. The stator according to claim 1, wherein the distance between adjacent insulating portions in a circumferential direction of the yoke varies in an axial direction of the yoke.

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