JP2015154497A - rotary electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine stator which inhibits deformation etc. of insulation paper thereby improving the coil space factor in a slot.SOLUTION: A rotary electric machine stator 10 includes: stator cores 12, each of which opens at the inner diameter side and has a bottom part at the outer diameter side, each stator core 12 in which a slot 16, into which a coil 40 is inserted, is provided penetrating in an axial direction; insulation paper 30, each of which is disposed in the slot 16 and has a bent part 32 which protrudes from an axial end surface 18 of the stator core 12 and is bent to the stator core 12 side; and protruding members 20, each of which has a shape formed along an opening end part 17 of the slot 16 on the axial end surface 18 of the stator core 12 and is disposed between the axial end surface 18 of the stator core 12 and the bent part 32 of the insulation paper 30.

Description

  The present invention relates to a rotating electrical machine stator, and more particularly, to a rotating electrical machine stator in which a coil is wound via insulating paper.

  In order to wind a coil, a stator of a rotating electric machine is provided with a magnetic pole forming projection called a tooth on the inner peripheral side of the stator core and a slot that is a gap space between adjacent teeth. It is inserted and wound around the teeth. In order to ensure insulation between the coil and the stator core, insulating paper is used to ensure insulation between the inner wall portion of the slot and the coil.

  In Patent Document 1, as a slot insulating paper to be mounted in a slot of a rotating electrical machine stator core, a cuff portion that is disposed along an inner peripheral surface of the slot and that protrudes from both ends in the axial direction and is folded back is provided. It is disclosed.

  In Patent Document 2, as the insulating paper provided in the slot of the rotating electrical machine stator core, both end portions projecting outward in the axial direction of the slot are provided, and folded in advance only at one end portion on the insertion side where the coil conductor is inserted. It is disclosed that a portion is provided. In addition, in the other end part, the coil conducting wire is bent through insulating paper using a bending jig while protruding.

JP 2011-200046 A JP 2013-051750 A

  Since the insulating paper disposed in the slot is easily deformed, the position may be displaced, the insertion opening for the coil may be closed, or the coil may be broken or buckled.

  An object of the present invention is to provide a rotating electrical machine stator capable of improving the coil space factor in a slot by suppressing deformation or the like of insulating paper.

  A rotating electrical machine stator according to the present invention includes a stator core that is open on the inner diameter side, has a bottom on the outer diameter side, and is provided with a slot through which a coil is inserted in the axial direction. Insulating paper having a bent portion protruding from the end surface and bent toward the stator core side, and having a shape along the opening edge of the slot in the axial end surface of the stator core, between the axial end surface of the stator core and the bent portion of the insulating paper And a convex member disposed on the surface.

  According to the said structure, the convex member which has a shape along the opening edge part of a slot is arrange | positioned between the bending part of insulating paper, and the axial direction end surface of a stator core. Since the position of the insulating paper is determined by the convex member, it is possible to prevent the positional deviation of the insulating paper and the closing of the insertion slot for the coil, and the insulating paper is supported by the convex member. It is possible to suppress the occurrence of bending or the like. As described above, since the deformation of the insulating paper is suppressed, the coils can be arranged orderly in the slot, and the coil space factor in the slot can be improved.

It is a figure which shows the rotary electric machine stator of embodiment which concerns on this invention. (A) is the figure seen from the axial direction end surface side of a stator, (b) is a perspective view which shows a slot and a convex member. It is a figure which shows the procedure which manufactures the rotary electric machine stator of embodiment which concerns on this invention. (A) is the figure which provided the convex member, (b) is the figure which has arrange | positioned the insulating paper, (c) is the figure which wound the coil. It is a figure which shows the other example of a convex member. (A) is one example and (b) is another example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The dimensions, shape, material, number of teeth, slots, and the like described below are examples for explanation, and can be appropriately changed according to the specifications of the rotating electrical machine stator. In the following description, the same elements are denoted by the same reference symbols in all the drawings, and redundant description is omitted.

  FIG. 1 is a diagram showing a structure of a rotating electrical machine stator 10 used for a rotating electrical machine mounted on a vehicle. Below, unless otherwise indicated, the rotary electric machine stator 10 is called the stator 10. FIG. The rotating electrical machine in which the stator 10 is used is a three-phase synchronous rotating electrical machine that is a motor generator that functions as an electric motor when the vehicle is powered and functions as a generator when the vehicle is braking. The rotating electrical machine includes a stator 10 that is a stator illustrated in FIG. 1 and a rotor that is an annular rotor that is disposed on the inner peripheral side of the stator 10 with a predetermined gap therebetween. In FIG. 1, the illustration of the rotor is omitted. 1 shows the circumferential direction θ, the radial direction R, and the axial direction Z of the stator 10, respectively. In the R direction, the direction from the inner diameter side to the outer diameter side was defined as + R.

  The stator 10 includes a stator core 12 and a coil 40 wound around the stator core 12. This stator 10 (1) forms a stator core 12 having a plurality of teeth 14 and a plurality of slots 16, and (2) a convex member 20 is arranged along the opening edge of the slot 16 on the axial end surface of the stator core 12. (3) Fitting the bent portion of the insulating paper 30 whose end is bent along the outer shape of the convex member 20, and (4) taking the steps of winding the coil 40 around the tooth 14 via the insulating paper 30. Manufactured.

  FIG. 1A is a view of the stator 10 as viewed from the end in the axial direction, and the above four procedures are sequentially shown. That is, in FIG. 1A, 12 teeth 14 and 12 slots 16 are shown, but when rotating clockwise from the upper side of the page, the two slots 16 have the procedure of (1). Shows what happened. The next four slots 16 indicate a state in which the procedure (2) has been performed. The next two slots 16 indicate a state in which the procedure (3) has been performed. Further, the following two slots 16 and teeth 14 show a state in which the procedure (4) has been performed. This state is the state of the stator 10 in which the coil 40 is wound around the stator core 12. FIG.1 (b) is a perspective view which shows the slot 16 in which the convex member 20 is arrange | positioned in the procedure of (2). In FIG. 1A, the reference numerals (1), (2), (3), and (4) indicating the above four procedures are attached to the corresponding portions.

  The stator core 12 has a plurality of teeth 14 projecting from the annular stator yoke to the inner peripheral side, and a slot 16 that is a gap between adjacent teeth 14. The slot 16 is a U-shaped groove that opens on the inner diameter side, has a bottom on the outer diameter side, and penetrates in the axial direction. The teeth 14 are protrusions that are wound around the coil 40 and serve as magnetic poles. The stator core 12 is formed by laminating a plurality of annular magnetic thin plates formed into a predetermined shape including the teeth 14. An electromagnetic steel plate can be used as the magnetic thin plate. Instead of the laminated body of magnetic thin plates, a magnetic powder integrally formed into a predetermined shape can be used.

  The convex member 20 is an additional member that is disposed along the opening edge 17 of the slot 16 in the axial end surface 18 of the stator core 12 and is used for suppressing deformation of the insulating paper 30. “Along the opening edge of the slot in the axial end face” means “U-shaped along the opening edge of the U-shaped slot 16 that appears on the axial end face of the stator core 12. In FIG. 1B, the convex member 20 is provided on one end face 18 of both axial end faces of the stator core 12, but it is preferable to provide the convex member 20 also on the other end face 18.

  The U-shape of the convex member 20 may be integrally formed, or several members may be combined to form a U-shape. The height of the convex member 20 can be determined by the radius of curvature of the bending deformation at the opening edge of the slot 16 when the coil 40 is wound. For example, the radius of curvature of the bending deformation of the coil 40 can be about 1 to 2 times. The top of the convex member 20 is preferably appropriately rounded. It is preferable that the roundness of the outer surface that is further away from the opening edge of the slot 16 is smoother than that of the inner surface that faces the opening edge of the slot 16 (see FIG. 3A).

  When the convex member 20 is disposed on the stator core 12, it is preferable to fix the stator core 12 and the convex member 20. As the fixing method, an adhesive can be used. You may join using foamed resin instead of an adhesive agent. Other fixing methods will be described later with reference to FIG. As this convex member 20, what shape | molded in the predetermined shape using the plastic material can be used. An appropriate metal material may be used in place of the plastic material.

  The insulating paper 30 is an insulator that is disposed inside the slot 16 and has a U-shape along the inner wall portion of the slot 16. The end of the insulating paper 30 is bent along the outer shape of the convex member 20 to form a bent portion 32 (see FIGS. 2B and 2C). Therefore, the total length along the axial direction of the insulating paper 30 before being bent is set to {(the axial length of the stator core 12 + the length of the convex member 20) + (the bending length)}. When the convex member 20 is provided on both axial end surfaces of the stator core 12, it is set to [(axial direction length of the stator core 12 + 2 × {(length of the convex member 20) + (bending length)}).

  As the insulating paper 30, a sheet obtained by molding a sheet having electrical insulation into a predetermined shape can be used. In addition to paper, a plastic film can be used as the sheet having electrical insulation.

  The coil 40 is obtained by winding a conductive wire with an insulating film around each tooth 14 by a predetermined coil winding method and electrically connecting it at a necessary place to form a three-phase winding. Here, the predetermined coil winding method is distributed winding or concentrated winding. As a conducting wire with an insulating film, a copper wire, a copper tin alloy wire, a silver plating copper tin alloy wire, etc. can be used as a strand. As the element wire, a rectangular wire having a rectangular cross-sectional shape is used. As the insulating film, a polyamide-imide enamel film is used. Instead of this, polyesterimide, polyimide, polyester, formal and the like can be used.

  FIG. 2 is a cross-sectional view showing the state of the end portion of the stator core 12 after the procedures (2) to (4) described in FIG. FIG. 2A is a diagram illustrating a state after the procedure of (2) described in FIG. 1 is performed. Here, the convex member 20 is fixed with an adhesive by being positioned along the opening edge of the slot 16 on the axial end surface 18 of the stator core 12.

  FIG. 2B is a diagram illustrating a state after the procedure of (3) described in FIG. 1 is performed. Here, the insulating paper 30 is disposed along the inner wall surface of the slot 16, and the end of the insulating paper 30 protruding from the axial end surface 18 of the stator core 12 is bent along the outer shape of the convex member 20. It is preferable that the angle of bending be 90 degrees or more so that the end of the bent portion 32 contacts the axial end surface 18 of the stator core 12.

  FIG. 2C is a diagram illustrating a state after the procedure (4) described in FIG. 1 is performed. Here, the coil 40 is inserted into the slot 16 via the insulating paper 30 and is bent in the direction according to a predetermined winding method at the axial end surface 18 of the stator core 12. Since the coil 40 is separated from the inner wall surface of the slot 16 by the insulating paper 30 and is separated from the axial end surface 18 of the stator core 12 by the bent portion 32 of the insulating paper 30, the coil 40 and the stator core 12 are electrically insulated. Sex is secured.

  Since the stator 10 is manufactured by the above procedure, the insulating paper 30 has the bent portion 32 positioned by the convex member 20 as shown in FIG. It is prevented from closing. Even if a large pressure or the like is applied to the insulating paper 30 when the coil 40 is bent, the bent portion 32 is supported by the convex member 20 as shown in FIG. It can be suppressed. Thereby, deformation of the insulating paper 30 and the like can be suppressed, and the space factor of the coil 40 in the slot 16 can be improved.

  FIG. 3 is a diagram illustrating another example of the convex member. FIG. 3A shows a method of fixing the stator core 12 by using a stepped convex member 22 and fitting the opening edge of the slot 16 with a step 24. FIG. 3 (b) uses a convex member 26 with a fitting pin, and a fitting pin 28 is fitted in a fitting hole 29 provided in the stator core 12. By these methods, the positioning accuracy with the stator core 12 is improved, and the contact area with the stator core 12 is increased, so that the fixing strength when an adhesive is used can be improved. In some cases, an adhesive or the like can be dispensed with.

As shown in FIG. 3A, the roundness of the tip of the convex member is larger than the radius of curvature r ₁ of the roundness of the inner surface facing the opening edge of the slot 16 and is more distant from the opening edge of the slot 16. It is preferable to increase the curvature radius r ₂ of the roundness of the side surface. Thereby, it is possible to mitigate the pressure concentration on the insulating paper 30 when the coil 40 is bent.

  In the above description, the convex member 20 is arranged and fixed to the stator core 12 prior to the insertion of the insulating paper 20. Instead, the insulating paper 30 having the bent portion 32 and the convex member 20 are prepared in advance, the convex member 20 is fitted into the bent portion 32 of the insulating paper 30, and the insulating paper 30 with the convex member is inserted into the slot 16. It is good also as what to do. In this case, it is possible to fix the convex member 20 and the stator core 12 by applying an adhesive to a predetermined portion of the bottom surface of the convex member 20 or the end surface of the stator core 12. You may fix between the convex member 20 and the stator core 12 using the structure of FIG. Also by this structure and method, the effects described in FIG.

  10 (Rotating electrical machine) Stator, 12 Stator core, 14 Teeth, 16 Slot, 17 Open edge, 18 (Axial direction) end face, 20, 22, 26 Convex member, 24 Step, 28 Fitting pin, 29 Fitting hole, 30 Insulating paper, 32 folds, 40 coils.

Claims (1)

A stator core provided with a slot that is open on the inner diameter side and has a bottom on the outer diameter side and is inserted in the axial direction through the coil;
An insulating paper having a bent portion disposed in the slot and protruding from the axial end surface of the stator core and bent to the stator core side;
A convex member having a shape along the opening edge of the slot in the axial end surface of the stator core, and disposed between the axial end surface of the stator core and the bent portion of the insulating paper;
A rotating electrical machine stator comprising:

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