Stator

Abstract

To provide a stator capable of securing insulation property to a coil winding part, while suppressing the increase of the size of the stator.SOLUTION: A stator (10) includes: a stator core (24) having a plurality of radially extending teeth parts (22); a resin insulator (16) mounted on the stator core; and a coil winding part (18) which is wound around the plurality of teeth parts through the insulator. The stator core has mounting surfaces (20A and 22A) on which the insulator is mounted, grooves (36 and 38) positioned on a side opposite to the coil winding part sandwiching the insulator are formed on the mounting surface, and gas layers (40 and 42) are formed by the grooves between the stator core and the insulator.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The technology of the present disclosure relates to a stator. [Background technology]

[0002] Conventionally, there is a stator including a stator core having a plurality of radially extending teeth, a resin insulator attached to the stator core, and a winding portion wound around the plurality of teeth via the insulator. Among these types of stators, there is one in which an insulating film is provided between the teeth and the winding portion (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-198515 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned conventional technology, when a high voltage is applied to the winding portion, there is a risk of dielectric breakdown in the insulating film. In order to withstand high voltages, it is possible to increase the thickness of the resin portion of the insulator provided between the teeth and the winding portion, but this would result in an increase in the size of the stator.

[0005] The technology disclosed herein has been made in consideration of the above-mentioned problems, and has an object to provide a stator that can ensure insulation for the winding winding portion while suppressing an increase in size of the stator. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, a stator (10) relating to the technology disclosed herein comprises a stator core (24) having a plurality of radially extending tooth portions (22), a resin insulator (16) attached to the stator core, and a winding winding portion (18) wound around the plurality of tooth portions via the insulator, the stator core having a mounting surface (20A, 22A) on which the insulator is attached, and grooves (36, 38, 50) are formed on the mounting surface and positioned on the opposite side of the insulator from the winding winding portion, and a gas layer (40, 42) is formed between the stator core and the insulator by the grooves.

[0007] According to the stator according to the technique of the present disclosure, it is possible to ensure insulation for the winding winding portion while suppressing an increase in size of the stator. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a plan view of the stator according to the first embodiment. [Diagram 2] FIG. 2 is a plan sectional view of a stator component according to the first embodiment. [Diagram 3] FIG. 11 is a plan sectional view of a stator component according to the second embodiment. [Figure 4] FIG. 11 is a plan sectional view of a stator component according to a third embodiment. [Diagram 5] FIG. 11 is a plan sectional view of a stator component according to a fourth embodiment. [Figure 6] FIG. 13 is a plan sectional view of a stator component according to a fifth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [First embodiment] First, a first embodiment of the technique of the present disclosure will be described.

[0010] As shown in FIG. 1, a stator 10 according to the first embodiment includes a plurality of stator components 12. The stator 10 is configured by combining the plurality of stator components 12 in an annular shape. FIG. 1 shows the configuration of half of the stator 10. The stator 10 is applied to a brushless motor. The brushless motor may be used for any purpose. Examples of brushless motors include fan motors, pump drive motors, and compressor motors.

[0011] In each figure, the X direction indicates the tangential direction of the stator 10, the Y direction indicates the radial direction of the stator 10, and the Z direction indicates the axial direction of the stator 10. In the following description, the circumferential direction of the stator 10 refers to the direction around the central axis of the stator 10. The tangential direction, radial direction, axial direction, and circumferential direction of the stator core 24 described later are the same as the tangential direction, radial direction, axial direction, and circumferential direction of the stator 10, respectively.

[0012] 2, each stator component 12 includes a core member 14, an insulator 16, and a winding winding portion 18. The core member 14 has a core back portion 20 and teeth portions 22. The core back portion 20 extends in the circumferential direction of the stator core 24, and the teeth portions 22 extend inward in the Y direction from the center of the core back portion 20. The tip portions of the teeth portions 22 are free ends, and the base ends of the teeth portions 22 are connected to the core back portion 20.

[0013] A stator core 24 (see FIG. 1) is formed by combining a plurality of core members 14 in an annular shape. When the stator core 24 is constructed, the plurality of core back portions 20 form an annular portion 26 (see FIG. 1), and the plurality of teeth portions 22 extend radially from the center of the stator core 24. Slots 28 are formed between the plurality of teeth portions 22.

[0014] Note that the configuration of each stator component 12, including its details, is not strictly symmetrical in the X direction when viewed from the Z direction. However, for the sake of convenience, the main configuration of each stator component 12 is assumed to be symmetrical in the X direction when viewed from the Z direction, and the configuration of one side of each stator component 12 will be described below.

[0015] An inner surface 20A is formed in the core back portion 20, and a side surface 22A is formed in the tooth portion 22. The inner surface 20A extends in the X direction and the Z direction and faces inward in the Y direction. The side surface 22A extends in the Y direction and the Z direction and faces the X direction. The inner surface 20A and the side surface 22A are in contact with the slot 28.

[0016] The insulator 16 is attached to the core member 14. The insulator 16 is made of resin. Examples of resins that form the insulator 16 include polyimide, polyamide, polyphenylene sulfide (PPS), and polybutylene terephthalate (PBT). Any resin may be used to form the insulator 16. The insulator 16 has an inner wall portion 30 and a side wall portion 32. The inner wall portion 30 is attached to the inner surface 20A and covers the inner surface 20A. The side wall portion 32 is attached to the side surface 22A and covers the side surface 22A. The inner wall portion 30 and the side wall portion 32 are disposed in a slot 28.

[0017] The inner surface 20A and the side surface 22A are an example of a "mounting surface" according to the technology of the present disclosure. The inner surface 20A is an example of a "first mounting surface" according to the technology of the present disclosure, and the side surface 22A is an example of a "second mounting surface" according to the technology of the present disclosure.

[0018] The winding winding portion 18 is wound around the teeth 22 via the insulator 16. The winding winding portion 18 is formed by winding a wire around the teeth 22 in the Y direction. The winding that forms the winding winding portion 18 may have only one winding winding portion 18, or may have several winding winding portions 18.

[0019] The winding winding portion 18 has an axial portion 34 extending in the Z direction. The axial portion 34 is inserted into the slot 28. The axial portion 34 has a side surface 34A and an end surface 34B. The side surface 34A is a surface formed on the tooth portion 22 side of the axial portion 34 (i.e., an inner side surface), and the end surface 34B is a surface formed on the core back portion 20 side of the axial portion 34. A side wall portion 32 is interposed between the side surface 34A of the axial portion 34 and the side surface 22A of the tooth portion 22, and an inner wall portion 30 is interposed between the end surface 34B of the axial portion 34 and the inner surface 20A of the core back portion 20.

[0020] A first groove 36 is formed in the inner surface 20A, and a second groove 38 is formed in the side surface 22A. The first groove 36 is located on the opposite side of the winding winding portion 18 across the inner wall portion 30 in the Y direction, and the second groove 38 is located on the opposite side of the winding winding portion 18 across the side wall portion 32 in the X direction. The position of the first groove 36 in the X direction and the width of the first groove 36 in the X direction are set so that the range of the width of the winding winding portion 18 in the X direction falls within the range of the width of the first groove 36 in the X direction. Similarly, the position of the second groove 38 in the Y direction and the width of the second groove 38 in the Y direction are set so that the range of the width of the winding winding portion 18 in the Y direction falls within the range of the width of the second groove 38 in the Y direction.

[0021] A first gas layer 40 is formed by a first groove 36 between the core back portion 20 and the inner wall portion 30, and a second gas layer 42 is formed by a second groove 38 between the teeth portion 22 and the side wall portion 32. The first groove 36 and the second groove 38 are formed to penetrate in the Z direction.

[0022] The first groove 36 and the second groove 38 are an example of a "groove" according to the technology of the present disclosure. The first gas layer 40 and the second gas layer 42 are an example of a "gas layer" according to the technology of the present disclosure.

[0023] Next, the operation and effects of the first embodiment of the technique of the present disclosure will be described.

[0024] As described above in detail, in the first embodiment, the first gas layer 40 is formed between the core back portion 20 and the inner wall portion 30 by the first groove 36, and the second gas layer 42 is formed between the teeth portion 22 and the side wall portion 32 by the second groove 38. Therefore, an insulating layer is formed between the core back portion 20 and the winding winding portion 18 by adding the first gas layer 40 to the inner wall portion 30, so that insulation from the winding winding portion 18 can be ensured. Also, an insulating layer is formed between the teeth portion 22 and the winding winding portion 18 by adding the second gas layer 42 to the side wall portion 32, so that insulation from the winding winding portion 18 can be ensured.

[0025] In addition, the first gas layer 40 is formed between the core back portion 20 and the inner wall portion 30 by the first groove 36, so that the thickness of the inner wall portion 30 can be made thinner than when the core back portion 20 and the winding winding portion 18 are insulated only by the inner wall portion 30. Similarly, the second gas layer 42 is formed between the teeth portion 22 and the side wall portion 32 by the second groove 38, so that the thickness of the side wall portion 32 can be made thinner than when the teeth portion 22 and the winding winding portion 18 are insulated only by the side wall portion 32. This allows the cross-sectional area of ​​the slot 28 to be enlarged, and thus the number of turns of the winding winding portion 18 can be increased, so that the size of the stator 10 can be suppressed. In other words, it is possible to suppress the size of the stator 10 from being enlarged in order to enlarge the cross-sectional area of ​​the slot 28.

[0026] [Second embodiment] Next, a second embodiment of the technique of the present disclosure will be described.

[0027] In the second embodiment, the configuration of the stator 10 is changed as follows from the first embodiment. That is, as shown in Fig. 3, a convex portion 44 that protrudes toward the side wall portion 32 is formed on the bottom surface of the second groove 38, and the convex portion 44 contacts the side wall portion 32 and supports the side wall portion 32. Meanwhile, a concave portion 46 is formed on the surface of the side wall portion 32 opposite to the contact surface with the convex portion 44, and a gas layer 48 is formed by the concave portion 46 between the winding winding portion 18 and the side wall portion 32. The concave portion 46 is formed at the same position as the convex portion 44 in the Y direction. The concave portion 46 is formed to penetrate in the Z direction.

[0028] With this configuration, the side wall portion 32 is supported by the protrusions 44, thereby improving the rigidity of the side wall portion 32. Even if the protrusions 44 are formed on the bottom surface of the second groove 38, the gas layer 48 is formed by the recesses 46, so that insulation can be ensured.

[0029] 3, one protrusion 44 is formed on the bottom surface of the second groove 38, but multiple protrusions 44 may be formed. Also, corresponding to the multiple protrusions 44, multiple recesses 46 may be formed on the surface of the side wall portion 32 opposite to the contact surface with the protrusion 44.

[0030] 3, the protrusion 44 may be formed on the bottom surface of the first groove 36, protrude toward the inner wall portion 30, and support the inner wall portion 30. The recess 46 may be formed on the surface of the inner wall portion 30 opposite to the contact surface with the protrusion 44, and form a gas layer 48 between the winding winding portion 18 and the inner wall portion 30.

[0031] With this configuration, the inner wall portion 30 is supported by the protrusions 44, thereby improving the rigidity of the inner wall portion 30. Even if the protrusions 44 are formed on the bottom surface of the first groove 36, the gas layer 48 is formed by the recesses 46, so that insulation can be ensured.

[0032] [Third embodiment] Next, a third embodiment of the technique of the present disclosure will be described.

[0033] In the third embodiment, the configuration of the stator 10 is changed as follows from the first embodiment. That is, as shown in Fig. 4, a groove 50 is formed in the core member 14, which is continuous from the inner surface 20A to the side surface 22A. The insulator 16 has a dividing portion 54 provided in an R-shaped portion 52 which is a connection portion between the inner surface 20A and the side surface 22A. The dividing portion 54 is provided in the R-shaped portion 52, and thereby divides the groove 50 into a first groove 36 and a second groove 38.

[0034] With this configuration, the grooves 50 can be formed continuously from the inner surface 20A to the side surface 22A, so that the processing for forming the grooves 50 can be easily performed.

[0035] Furthermore, since the insulator 16 has a dividing portion 54 provided in the R-shaped portion 52 which is a connection portion between the inner surface 20A and the side surface 22A, the dividing portion 54 can support the inner wall portion 30 and the side wall portion 32. This ensures the rigidity of the inner wall portion 30 and the side wall portion 32 even if the groove 50 is continuously formed from the inner surface 20A to the side surface 22A.

[0036] [Fourth embodiment] Next, a fourth embodiment of the technique of the present disclosure will be described.

[0037] In the fourth embodiment, the configuration of the stator 10 is changed from that of the first embodiment as follows. That is, in the first embodiment, the inner surface 20A extends in the X direction when viewed from the Z direction, but in the fourth embodiment, as shown in Fig. 5, the inner surface 20A extends in a direction inclined inward in the Y direction with respect to the X direction when viewed from the Z direction. Similar to the first embodiment, a first gas layer 40 is formed between the core back portion 20 and the inner wall portion 30 by the first groove 36, and a second gas layer 42 is formed between the teeth portion 22 and the side wall portion 32 by the second groove 38.

[0038] Even with this configuration, the same effects as in the first embodiment can be achieved.

[0039] [Fifth embodiment] Next, a fifth embodiment of the technique of the present disclosure will be described.

[0040] In the fifth embodiment, the configuration of the stator 10 is changed from that of the third embodiment as follows. That is, in the third embodiment, the inner surface 20A extends in the X direction when viewed from the Z direction, but in the fifth embodiment, as shown in Fig. 6, the inner surface 20A extends in a direction inclined inward in the Y direction with respect to the X direction when viewed from the Z direction. As in the third embodiment, a groove 50 is formed in the core member 14 that continues from the inner surface 20A to the side surface 22A, and the insulator 16 has a dividing portion 54 provided in an R-shaped portion 52 that is a connection portion between the inner surface 20A and the side surface 22A.

[0041] Even with this configuration, the same effects as in the third embodiment can be achieved.

[0042] In each of the above embodiments, the stator core 24 is divided into a plurality of core members 14, but the plurality of core members 14 may be integrated together. Also, the insulators 16 attached to the respective core members 14 may be integrated together.

[0043] Furthermore, among the configurations described in the above embodiments, configurations that can be combined may be combined as appropriate.

[0044] While one embodiment of the technology of the present disclosure has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms without departing from the spirit and scope of the present invention.

[0045] Below, supplementary notes regarding the technology of the present disclosure are provided. (Appendix 1) a stator core (24) having a plurality of radially extending teeth portions (22); a resin insulator (16) attached to the stator core; a winding portion (18) wound around the plurality of teeth portions via the insulator; Equipped with The stator core has a mounting surface (20A, 22A) on which the insulator is mounted, The mounting surface is formed with grooves (36, 38, 50) located on the opposite side of the insulator from the winding portion, A gas layer (40, 42) is formed between the stator core and the insulator by the groove. Stator (10). (Appendix 2) The stator core has a core back portion (20) extending in a circumferential direction of the stator core and connected to a base end portion of the teeth portion, The mounting surface has a first mounting surface (20A) formed on the core back portion and a second mounting surface (22A) formed on the teeth portion, The grooves (36, 38) include a first groove (36) formed in the first mounting surface and a second groove (38) formed in the second mounting surface. 2. The stator of claim 1. (Appendix 3) The groove (50) is continuous from the first mounting surface to the second mounting surface, The insulator has a dividing portion (54) that is provided at a connection portion (52) between the first mounting surface and the second mounting surface and divides the groove into the first groove and the second groove. 3. The stator according to claim 2. (Appendix 4) A protrusion (44) is formed on the bottom surface of the groove, protruding toward the insulator and supporting the insulator, A recess (46) is formed on a surface of the insulator opposite to the contact surface with the protrusion, the recess (46) forming a gas layer (48) between the winding winding portion and the insulator. 4. The stator according to claim 1 , [Explanation of symbols]

[0046] 10... stator, 12... stator component, 14... core member, 16... insulator, 18... winding winding portion, 20... core back portion, 20A... inner surface, 22... teeth portion, 22A... side surface, 24... stator core, 26... annular portion, 28... slot, 30... inner wall portion, 32... side wall portion, 34... axial portion, 34A... side surface, 34B... end surface, 36... first groove, 38... second groove, 40... first gas layer, 42... second gas layer, 44... convex portion, 46... concave portion, 48... gas layer, 50... groove, 52... R-shaped portion, 54... division portion

Claims

1. a stator core (24) having a plurality of radially extending teeth (22); a resin insulator (16) attached to the stator core; a winding portion (18) wound around the plurality of teeth portions via the insulator; Equipped with The stator core has a mounting surface (20A, 22A) on which the insulator is mounted, The mounting surface has grooves (36, 38, 50) formed on the opposite side of the insulator from the winding portion, A gas layer (40, 42) is formed between the stator core and the insulator by the groove, the gas layer is entirely covered by the insulator; Stator (10).

2. The stator core has a core back portion (20) extending in the circumferential direction of the stator core and connected to a base end portion of the tooth portion, The mounting surface has a first mounting surface (20A) formed on the core back portion and a second mounting surface (22A) formed on the teeth portion, The grooves (36, 38) include a first groove (36) formed in the first mounting surface and a second groove (38) formed in the second mounting surface. The stator according to claim 1 .

3. The groove (50) is continuous from the first mounting surface to the second mounting surface, The insulator has a dividing portion (54) provided at a connection portion (52) between the first mounting surface and the second mounting surface, dividing the groove into the first groove and the second groove. The stator according to claim 2 .

4. A protrusion (44) is formed on the bottom surface of the groove, protruding toward the insulator and supporting the insulator, A recess (46) is formed on the surface of the insulator opposite to the contact surface with the protrusion, and the recess (46) forms a gas layer (48) between the winding winding portion and the insulator. The stator according to claim 1 .

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