JP2017123743A - Stator for electric motor - Google Patents

Abstract

An insulating member is securely fixed by a tooth. An insulating member 44 includes a back portion 44a covering an inner peripheral surface of a stator core positioned between adjacent teeth 24, and one side surface corresponding to a tooth 24 extending from both ends in the circumferential direction of the back portion 44a. A side portion 44 to be covered, and flange portions 44d and 44e extending from end portions in the same direction in the axial direction of the stator core 22 of the side portion 44 and covering a part of the corresponding end surfaces in the axial direction of the teeth 24. The insulating member 44 disposed in the slot 26 and the flange portions 44d and 44e are disposed alternately. Then, sandwiching portions 46b and 46c are provided in the fixing member 46, and the flange portions 44d and 44e on both end faces of the tooth 24 are sandwiched from outside by the sandwiching portions 46b and 46c. Thereby, the insulating member 44 can be reliably fixed by the teeth 24. [Selection] Figure 2

Description

  The present invention relates to a stator for an electric motor.

  Conventionally, as this kind of stator for an electric motor, one having a stator core and first and second insulating members has been proposed (for example, see Patent Document 1). The stator core includes a plurality of teeth portions around which a coil is wound. The 1st insulating member is arrange | positioned so that it may contact | adhere to the side surface of a teeth part. The second insulating member is disposed on the end surface of the stator core in the axial direction. The first and second insulating members are disposed between the stator core and the coil, and insulate the stator core from the coil. In this stator for an electric motor, the second insulating member is arranged so as to be in contact with the first insulating member without a step, thereby preventing the coil from being caught at the portion where the first insulating member and the second insulating member are in contact with each other. doing.

JP 2014-180067 A

  However, in the above-described stator for an electric motor, a total of four insulations, one first insulating member on each side surface and one second insulating member on each axial end surface, for one tooth portion. A member needs to be arranged, and the number of parts increases. As a technique for suppressing the increase in the number of parts, there is a technique in which two U-shaped insulating members are opposed to each other and inserted into the tooth portion from both axial sides of the tooth portion. In this method, when two insulating members face each other and are inserted into the tooth portion, one insulating member may be displaced. If the insulating member is displaced, a gap may be formed between the two insulating members, and insulation between the stator core and the coil may not be ensured.

  The main object of the stator for an electric motor of the present invention is to securely fix the insulating member with teeth.

  The stator for an electric motor according to the present invention employs the following means in order to achieve the main object described above.

The stator for an electric motor of the present invention is
A stator core having a plurality of teeth around which a stator coil is wound, and a plurality of slots between the plurality of teeth;
A plurality of insulating members disposed in the slot and insulating the stator core and the stator coil;
A stator for an electric motor comprising:
A plurality of fixing members disposed on the corresponding teeth and fixing the insulating member to the stator core;
With
The insulating member includes a back portion covering an inner peripheral surface of the stator core positioned between two adjacent teeth, and one side surface corresponding to the two teeth extending from both ends in the circumferential direction of the back portion. Two flanges that cover the at least part of the axial end surfaces corresponding to the teeth, extending from the ends in the same direction in the axial direction of the stator core of the two side portions, Have
The insulating member is arranged so that the insulating member arranged in the adjacent slot and the flange portion are staggered,
The fixing member includes a pair of two sandwiching portions that sandwich the flange portions disposed on both end surfaces of the corresponding teeth from outside.
This is the gist.

  The stator for an electric motor of the present invention has a plurality of fixing members that are arranged on corresponding teeth and fix the insulating member to the stator core. The insulating member includes a back portion that covers the inner peripheral surface of the stator core positioned between two adjacent teeth, and two side portions that extend from both ends in the circumferential direction of the back portion and cover one side surface of the two teeth. And two flange portions extending from end portions in the same direction in the axial direction of the stator cores on the two side portions and covering at least a part of the corresponding axial end surfaces of the teeth, and are disposed in adjacent slots. The insulating members and the flanges are arranged alternately. Therefore, the flange part of the insulating member arrange | positioned in the adjacent slot is arrange | positioned at the both end surfaces of the teeth. The fixing members are paired and have two sandwiching portions that sandwich the flange portions disposed on both end surfaces of the corresponding teeth from the outside. Thereby, since the flange part of an insulating member is pinched | interposed from an outer side by two clamping parts, an insulating member can be reliably fixed with a tooth | gear.

It is a top view which shows the principal part of the stator 20 for electric motors as one Example of this invention. It is an external view which shows the principal part of the stator 20 for electric motors. It is sectional drawing which shows the outline of the cross section in the AA line of FIG. FIG. 6 is an explanatory diagram for explaining a state in which an insulating member 44 is disposed on the stator core 22. It is explanatory drawing for demonstrating arrangement | positioning and a structure of the insulating member 44 and the fixing member 46. FIG. 5 is an explanatory diagram for explaining a state in which an insulating member 44 is assembled to the stator core 22. FIG.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a plan view showing a main part of an electric motor stator 20 as an embodiment of the present invention. FIG. 2 is an external view showing a main part of the stator 20 for an electric motor. In FIG. 2, the stator coil 40 is not shown. FIG. 3 is a cross-sectional view schematically showing a cross section taken along line AA of FIG. FIG. 4 is an explanatory diagram for explaining a state in which the insulating member 44 is disposed on the stator core 22. FIG. 5 is an explanatory diagram for explaining the arrangement and configuration of the insulating member 44 and the fixing member 46.

  The stator 20 for an electric motor, together with a rotor (not shown), constitutes a three-phase AC electric motor used as a driving source or a generator for running an electric vehicle or a hybrid vehicle, for example. As shown in FIG. 1, the electric motor stator 20 includes a stator core 22, a stator coil 40, a plurality of insulating members 44, and a plurality of fixing members 46.

  The stator core 22 is configured by laminating a plurality of electromagnetic steel plates formed into an annular shape by press working, for example, and is formed in a cylindrical shape as a whole. As shown in FIGS. 1 and 2, the stator core 22 includes a plurality of teeth 24 projecting radially inward from the annular outer peripheral portion at intervals in the circumferential direction, and a plurality of slots between the teeth 24 adjacent to each other. 26. The stator core 22 may be integrally formed by, for example, pressing and sintering a ferromagnetic powder.

  The stator coil 40 constitutes a U-phase coil, a V-phase coil, and a W-phase coil, and is inserted into the slot 26 as shown in FIG. The stator coil 40 is wound, for example, by a plurality of stages (for example, about 10 stages) along a winding axis so that one rectangular wire 41 having a rectangular (including square) cross section is along the outer peripheral surface of the tooth 24. In addition to turning, it is constituted by winding around the winding axis a plurality of times (in this embodiment, twice) or only once.

  The plurality of insulating members 44 are formed by, for example, resin injection molding. As shown in FIG. 1, the insulating member 44 is disposed between the stator core 22 and the stator coil 40 in the slot 26 to insulate the stator core 22 from the stator coil 40. As shown in FIGS. 1 to 5, the insulating member 44 includes a back portion 44 a that covers the inner peripheral surface 22 a (see FIG. 1) of the stator core 22 (yoke portion) located between the adjacent teeth 24 of the stator core 22, and Side portions 44b and 44c extending from both ends of the back portion 44a in the circumferential direction of the stator core 22 so as to cover corresponding one side surfaces of the two teeth 24, and side portions 44b and 44c in the axial direction of the stator core 22 And flange portions 44d and 44e that extend from the end portion in the same direction and cover at least one-half or more of the axial end surface of the tooth 24. 2 and 4, the insulating member 44 is disposed in the adjacent slot 26 so that the flange portions 44 d and 44 e are alternately arranged. It is arranged upside down. Therefore, the flange portion 44 d or the flange portion 44 e of the insulating member 44 disposed in the adjacent slot 26 is disposed on both end surfaces of the tooth 24. In the embodiment, it is possible to insulate the stator core 22 and the stator coil 40 by disposing one insulating member 44 in one slot 26. Therefore, an increase in the number of parts can be suppressed as compared with one in which two U-shaped insulating members are inserted into the teeth facing each other from both sides in the axial direction of one tooth.

  As shown in FIGS. 1 to 5, the plurality of fixing members 46 are disposed on the corresponding teeth 24, and as shown in FIGS. 1 to 5, a base portion 46 a having an outer diameter larger than the inner peripheral surface of the teeth 24, and an axial end portion of the base portion 46 a Sandwiched portions 46b and 46c extending in the radial direction of the stator core 22 from the center. Since the base 46a has an outer diameter larger than the inner peripheral surface of the tooth 24, the stator coil 40 inserted into the slot 26 can be prevented from jumping out toward the inner diameter side. The sandwiching portions 46b and 46c are paired and sandwich the flange portions 44d and 44e disposed on both end surfaces of the corresponding teeth 24 from the outside. The insulating member 44 can be reliably fixed to the tooth 24 by the sandwiching portions 46b and 46c.

  FIG. 6 is an explanatory diagram for explaining a state in which a plurality of insulating members 44 are assembled to the stator core 22. When the insulating member 44 is assembled to the stator core 22, as shown in the drawing, each insulating member 44 is adjacent to the insulating member 44 disposed in the adjacent slot 26 so that the flange portions 44d and 44e are staggered. Insulating members 44 arranged in the slots 26 are inserted into the slots 26 from above and below in an upside down state in FIG. And after arrange | positioning the insulating member 44 in each slot 26, each fixing member 46 is attached to each tooth 24 from the inner peripheral side of the teeth 24, and the stator coil 40 is wound around each tooth 24 via the insulating member 44. . Thereby, the stator core 22 and the stator coil 40 are insulated by the insulating member 44.

  In the case where two U-shaped insulating members are inserted into the teeth 24 while facing each other from both sides in the axial direction of the teeth 24, in order to ensure insulation between the stator core 22 and the stator coil 40, the insulations face each other so that there is no gap. It is necessary to bring the ends of the members into contact with each other. When the end portions are brought into contact with each other, the load concentrates on the end portions, so that it is necessary to increase the thickness in order to give strength, and the space factor of the stator coil 40 is reduced. In the motor stator 20 according to the embodiment, since one insulating member 44 may be disposed in one slot 26, it is not necessary to partially increase the thickness of the insulating member 44. Therefore, as compared with the case where two U-shaped insulating members are inserted into the tooth 24 facing each other from both sides in the axial direction of the tooth 24, a decrease in the space factor of the stator coil 40 can be suppressed.

  Further, in the motor stator 20 of the embodiment, the sandwiching portions 46b and 46c are provided in the fixed member 46, and the flange portions 44e and 44d of the insulating member 44 are sandwiched from the outside of the teeth 24 by the sandwiching portions 46b and 46c. 44 is fixed. Accordingly, the insulating member 44 can be prevented from shifting after the insulating member 44 is disposed in the slot 26, and the insulating member 44 can be reliably fixed to the teeth 22.

  In the motor stator 20 according to the embodiment described above, the insulating member 44 extends from the back portion 44a covering the inner peripheral surface 22a of the stator core 22 located between the teeth 24 adjacent to each other, and both ends in the circumferential direction of the back portion 44a. Side portions 44b and 44c that cover one side surface corresponding to the teeth 24, and flanges that cover at least a portion of the teeth 24 in the axial direction extending from both ends in the same direction in the axial direction of the stator core 22 of the side portions 44b and 44c. And the insulating member 44 disposed in the adjacent slot 26 and the flange portions 44d and 44e are alternately arranged. Then, the sandwiching portions 46b and 46c are provided in the fixing member 46, and the flange portions 44d and 44e on both end surfaces of the tooth 24 are sandwiched from the outside by the sandwiching portions 46b and 46c. Can do.

  In the motor stator 20 according to the embodiment, the flange portions 44d and 44e of the insulating member 44 cover at least one half or more of the axial end surface of the tooth 24. However, the flange portions 44d and 44e are the teeth 24. It is good also considering the area which covers the end surface of the axial direction of this as less than a half of an end surface. In this case, it is desirable to provide the sandwiching portions 46b and 46c of the fixing member 46 at positions shifted from the center of the axial end portion of the base portion 46a toward the flange portions 44d and 44e.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the stator core 22 corresponds to a “stator core”, the insulating member 44 corresponds to an “insulating member”, and the fixing member 46 corresponds to a “fixing member”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of stators for electric motors.

 20 Stator for motor, 22 Stator core, 22a Inner peripheral surface, 24 teeth, 26 slots, 40 stator coil, 41 rectangular wire, 44 insulation member, 44a back, 44b, 44c side, 44d, 44e flange, 46 fixing member, 46a Base part, 46b, 46c Clamping part.

Claims (1)

A stator core having a plurality of teeth around which a stator coil is wound, and a plurality of slots between the plurality of teeth;
A plurality of insulating members disposed in the slot and insulating the stator core and the stator coil;
A stator for an electric motor comprising:
A plurality of fixing members disposed on the corresponding teeth and fixing the insulating member to the stator core;
With
The insulating member includes a back portion covering an inner peripheral surface of the stator core positioned between two adjacent teeth, and one side surface corresponding to the two teeth extending from both ends in the circumferential direction of the back portion. Two flanges that cover the at least part of the axial end surfaces corresponding to the teeth, extending from the ends in the same direction in the axial direction of the stator core of the two side portions, Have
The insulating member is arranged so that the insulating member arranged in the adjacent slot and the flange portion are staggered,
The fixing member includes a pair of two sandwiching portions that sandwich the flange portions disposed on both end surfaces of the corresponding teeth from outside.
Stator for electric motor.

Images