JP2008263726A - Interphase insulation sheet for rotary electric machine and stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interphase insulation sheet for a rotary electric machine that prevents the bending of a joint streak portion inserted into slots when manufacturing the rotary electric machine in which the joint streak portion is inserted into the slots. <P>SOLUTION: This interphase insulation sheet 11 arranged in a stator of the rotary electric machine comprises a pair of interphase insulation sheet bodies 12, 12, which are formed in a shape that can insulate spaces between coil end portions of plural phases in both axial end portions of a stator core, and joint streak portions 13, which joint the pair of interphase insulation sheet bodies 12, 12 and are arranged inside semienclosed slots of the stator core. On each joint streak portion 13, a curved part 14 in the shape of crest folding is formed extending in the longitudinal direction of the joint streak portion 13. Then, in the joint streak portion 13 inserted into the semienclosed slots, the relation of width dimension W<SB>1</SB>in the short side direction of the joint streak portion 13 with the curved part 14, width dimension W<SB>2</SB>of openings of the semienclosed slots, and the maximum width dimension W<SB>3</SB>of the semienclosed slots is W<SB>2</SB>×1.1≤W<SB>1</SB>≤W<SB>3</SB>×0.9. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an interphase insulating paper and a stator for a rotating electrical machine that insulates between coil end portions of respective phases at both axial end portions of a stator core.

  Generally, in a stator of a rotary electric machine, for example, a three-phase electric motor, an interphase insulating paper body of interphase insulating paper is inserted between coil end portions of each phase protruding from both axial end portions of the stator core, and the coil end Insulation between the parts is performed (see, for example, Patent Document 1).

  FIG. 14 shows a general interphase insulating paper 101. The interphase insulating paper 101 includes a pair of interphase insulating paper main bodies 102 and 102 and connecting strips 103 and 103 that connect the pair of interphase insulating paper main bodies 102 and 102. The interphase insulating paper bodies 102 and 102 are inserted between the coil end portions, and the connecting strip portions 103 and 103 are inserted into the slots of the stator core.

By adopting a configuration in which the interphase insulating paper main bodies 102, 102 are connected by the connecting strips 103, 103, even if a force acts in a direction away from the pair of interphase insulating paper main bodies 102, 102, the interphase insulating paper main body 102, The distance 102 can be kept at a constant distance, so that it is sandwiched at a predetermined position between the coil end portions and has a sufficient insulating action.
The interphase insulating paper main body 102 and the connecting strip 103 constituting the interphase insulating paper 101 are made of a resin material having excellent insulating properties and heat resistance, such as polyamide resin, and press the resin material formed into a sheet shape. As a result, the interphase insulating paper main body 102 and the connecting strip 103 are integrally formed.
JP 2006-288041 A

  In order to insert the connecting strip 103 of the interphase insulating paper 101 into the slot, it is necessary to make the width dimension in the short direction of the connecting strip 103 shorter than the width of the opening of the slot. However, if the width dimension of the sheet-like connecting strip 103 is shortened, it becomes easy to bend. Therefore, when manufacturing a rotating electrical machine in which the connecting strip 103 is inserted into the slot, after the connecting strip 103 is inserted into the slot, a force in a direction approaching the pair of interphase insulating paper bodies 102 and 102 acts. The connecting strip 103 is bent and jumps out from the opening of the slot, and the interphase insulating paper main bodies 102 and 102 are displaced from a predetermined position, so that the interphase insulating paper main bodies 102 and 102 cannot be kept apart from each other by a predetermined distance. There is a risk of insufficient insulation between the parts. For this reason, it is necessary to insert the next coil after reinserting the connecting strip 103 protruding from the slot and rearranging the interphase insulating paper main bodies 102 and 102 at a predetermined position, resulting in poor working efficiency.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent bending of the connecting strip inserted into the slot as much as possible during manufacture of the rotating electrical machine in which the connecting strip is inserted into the slot. It is to provide an interphase insulating paper and a stator for a rotating electric machine.

  The interphase insulating paper of the rotating electrical machine of the present invention includes a pair of interphase insulating paper main bodies formed in a shape capable of insulating between coil end portions of a plurality of phases at both axial end portions of the stator core, and the pair of interphase insulating paper. And a connecting strip located in the slot of the stator core, wherein the connecting strip is formed with a bent portion extending in the longitudinal direction of the connecting strip. (Invention of claim 1).

  The interphase insulating paper of the rotating electrical machine of the present invention includes a pair of interphase insulating paper bodies formed in a shape capable of insulating between coil end portions of a plurality of phases at both axial ends of the stator core, and the pair of interphase insulating papers. Connecting the insulating paper main body, and having a connecting strip located in the slot of the stator core, the connecting strip is made of a material having a higher bending strength than the interphase insulating paper main body. (Invention of claim 5)

  A stator of a rotating electrical machine according to the present invention comprises a stator core, a plurality of coils mounted on the stator core, and interphase insulating paper according to any one of claims 1 to 5. (Invention of claim 6).

According to the present invention, the bent portion extending in the longitudinal direction of the connecting strip portion is formed in the connecting strip portion of the interphase insulating paper. The ridge is difficult to bend and hardly protrudes from the opening of the slot. As a result, the pair of interphase insulating paper bodies can be kept apart by a certain distance.
In addition, since the connecting strip of the interphase insulating paper is made of a material having a bending strength greater than that of the interphase insulating paper main body, the connecting strip is difficult to bend and the pair of interphase insulating paper main bodies can be kept apart by a certain distance. it can.

  A first embodiment of the present invention will be described below with reference to FIGS. For the sake of convenience, the case where the bent portion is formed so that a bent portion is formed on the front side and the upper side in the figure is defined as a mountain fold, and the bent side is formed on the back side and the lower side in the figure. The case of folding so that a part is formed will be described as valley folding, and other embodiments will be described in the same direction.

First, FIG. 5 shows a schematic configuration of a rotating electric machine according to the present embodiment, for example, a stator of an electric motor. The stator 1 is configured by mounting a plurality of phases, for example, a U-phase coil 3, a V-phase coil 4, and a W-phase coil 5, which are three-phase coils, on a stator core 2.
The stator core 2 has an annular shape formed by stacking and integrally bonding a plurality of steel plates. On the inner peripheral surface of the stator core 2, semi-closed slots 6 are formed at a plurality of locations, for example, 48 locations, in order to dispose the coils 3, 4 and 5 of each phase. Semi-closed slot 6, as shown in FIG. 6, the width W ₂ of the opening of the semi-closed slot 6, a shape smaller than the maximum width W ₃ of the semi-closed slot 6.

  Slot insulating paper 7 (shown in FIG. 7) is arranged on the inner peripheral surface of each semi-closed slot 6, and coils 3 and 4 of the respective phases arranged in the stator core 2 and the semi-closed slot 6. , 5 are insulated. Note that a U-phase coil 3, a V-phase coil 4, and a W-phase coil 5 are arranged in order from the outermost peripheral side of the stator core 2.

  As shown in FIG. 7, at the coil end portions 3a, 4a, 5a protruding from both axial ends 2a, 2a of the stator core 2, the coil end portions 3a of the U-phase coil 3 and the coil ends of the V-phase coil 4 are provided. The interphase insulating paper main body 12 of the interphase insulating paper 11 is arranged between the coil end portion 4a and between the coil end portion 4a of the V phase coil 4 and the coil end portion 5a of the W phase coil 5, respectively. Insulation is performed between the parts 3a, 4a, 5a.

  As shown in FIGS. 1 and 7, the interphase insulating paper 11 includes a pair of interphase insulating paper main bodies 12 and 12 and a plurality of, for example, three connecting strips connecting the pair of interphase insulating paper main bodies 12 and 12. The interphase insulating paper main body 12 and the connecting strip portion 13 are joined and formed by welding or adhesion. The interphase insulating paper main body 12 and the connecting strip 13 are made of a resin material excellent in insulation and heat resistance, for example, a polyamide-based resin material.

  As shown in FIGS. 1 and 2, a mountain-folded bent portion 14 extending in the longitudinal direction of the connecting strip 13 is formed at the center of each connecting strip 13 in the short direction. Wall portions 15 and 15 are formed on both sides of the connecting strip 13 in the short direction with the center of the bent portion 14 interposed therebetween. Further, as shown in FIG. 1, rectangular connecting portions 16 and 16 are formed at both ends of the connecting strip portion 13 in the longitudinal direction, and the back surface (the bent portion 14 is formed) of the connecting portion 16. As described above, the non-finished surface) is coupled to the interphase insulating paper main body 12. As shown in FIG. 3, an isosceles triangle rising portion 17 is formed between the bent portion 14 and the coupling portion 16, and a triangular back surface portion 18 is formed between the wall portions 15, 15 and the rising portion 17. , 18 are formed.

  As shown in FIG. 7, the connecting strips 13, 13, 13 in which the bent portion 14 is formed are inserted into the semi-closed slot 6 of the stator core 2. Although not illustrated, the connecting strip 13 is inserted so that the side on which the bent portion 14 is formed (mountain fold side) is positioned on the outer peripheral side of the stator core 2.

Here, the assembly of the connecting strip 13 will be described with reference to FIGS. 3 and 4.
First, the material in a state (folded state) before bending of the connecting strip portion 13 shown in FIG. 4 is valley-folded around the boundary line 19 between the coupling portion 16 and the rising portion 17. Next, the wall portions 15 and 15 and the rising portion 17 are formed by folding the connecting strip portion 13 around the bent portion 14. Then, as shown in FIG. 3, the back surface portions 18 and 18 are formed on the opposite side of the coupling portion 16 with the rising portion 17 interposed therebetween.

The width W ₁ in the short direction of the connecting strip 13 after the mountain-folded bent portion 14 is formed and inserted into the semi-closed slot 6 (see FIG. 2), the width of the opening of the semi-closed slot 6 greater than the dimension W _2, and is smaller than the maximum width W ₃ of the semi-closed slot 6 (see FIG. 6). More preferably, the width W ₁ of the connecting strip 13 is not less than 1.1 times the width W ₂ of the opening of the semi-closed slot 6 and 0 of the maximum width W ₃ of the semi-closed slot 6. .9 times or less, that is, a dimension satisfying the relationship of W ₂ × 1.1 ≦ W ₁ ≦ W ₃ × 0.9.

Next, the operation and effect of the interphase insulating paper 11 disposed between the coil end portions 3a, 4a, and 5a will be described.
First, as shown in FIG. 7, the slot insulating paper 7, the U-phase coil 3, the interphase insulating paper 11, the V phase coil 4, the interphase insulating paper 11, and the W phase coil 5 are placed on the stator core 2 (semi-closed slot 6). Insert in this order. When inserting the interphase insulating paper 11 into the semi-closed slot 6, as described above, the interphase insulating paper main body 12 is inserted between the coil end portions 3 a, 4 a, 5 a, and the connecting strip portion 13 is inserted into the semi-closed slot 6. Inserted. Upon insertion of the interphase insulating sheet 11, the width W ₁ of the short direction to be smaller than the width W ₂ of the opening of Han閉slot 6 of the connection strip 13, the bent and curved portion 14 Then, the connecting portion 13 is inserted so that the bent portion 14 side (mountain fold side) is positioned on the outer peripheral side of the stator core 2. In this case, after insertion, when the bent portion 14 naturally opens in the semi-closed slot 6, the width dimension W _{1 of} the connecting strip 13 in the short direction is larger than the width dimension W ₂ of the opening of the semi-closed slot 6. growing.

  Although not shown, the coil end portions 3a, 4a, and 5a are expanded in the outer peripheral direction of the stator core 2 (upward in FIG. 7) and pressed toward the end 2a side of the stator core 2 for shaping. Then, the coil end portions 3a, 4a, and 5a and the interphase insulating paper main body 12 are bound with an insulating thread (not shown), and a varnish (not shown) is dropped to manufacture the stator 1. Is done.

  According to the above configuration, the interphase insulating paper main body 12 of the interphase insulating paper 11 can insulate between the coil end portions 3a, 4a, 5a, and the interphase insulating paper main body 12 and the connecting strip 13 are combined. Since it is a structure, even if a force acts on the pair of interphase insulating paper main bodies 12 and 12 in directions away from each other, the distance between the interphase insulating paper main bodies 12 and 12 can be kept constant.

  And since the mountain fold-shaped bending part 14 extended in the elongate direction of the connection strip 13 was formed in the connection strip 13 of the interphase insulating paper 11, the pair of interphase insulating paper main bodies 12, 12 in a direction approaching each other. Even if force is applied, the connecting strip 13 is unlikely to be bent, and the connecting strip 13 can be hardly ejected from the opening of the semi-closed slot 6. Thereby, a pair of interphase insulation paper main bodies 12 and 12 can be kept away by a fixed distance.

Further, the width W ₁ shorter direction of the connection strip 13 after being inserted into the semi-closed slot 6, larger than the width W ₂ of the opening of the semi-closed slot 6, and the maximum width of the semi-closed slot 6 having smaller than the dimension W _3, even at work act to bend connection strip portion 13 which is inserted into the semi-closed slot 6, the width direction of the end portion of the connection strip 13 (wall 15) of the semi-closed slot 6 opening It can contact the inner peripheral surface (wall) on the part side and prevent the connecting strip 13 from bending. Here, since the relationship between the dimension W ₁ , the dimension W _2, and the dimension W ₃ is set to W ₂ × 1.1 ≦ W ₁ ≦ W ₃ × 0.9, bending of the connecting strip portion 13 is further prevented. it can.

Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the same part as the said 1st Embodiment, and the detailed description is abbreviate | omitted.
The connecting strip 22 of the interphase insulating paper 21 of the second embodiment is made of the same material as the connecting strip 13, and the bent portion 23 of the connecting strip 22 is formed at two locations as shown in FIG. It is a laterally U-shaped shape having bent portions 23a, 23a, and has a shape having an opening on the lower side in the figure. As shown in FIG. 8, the bent portion 23 extends in the longitudinal direction of the connecting strip portion 22. By bending the bent portion 23, rectangular walls 24 and 24 are formed on both surfaces of the connecting strip 22 facing in the short direction as shown in FIGS. 8, 9, and 10. A rectangular upper surface portion 25 is formed on the upper surface between 24 and 24. Further, as shown in FIG. 10, a trapezoidal rising portion 27 is formed so as to connect the upper surface portion 25 and the coupling portion 26 that is coupled to the insulating paper body 12, and between the wall portions 24, 24 and the rising portion 27. Are formed with right-angled triangular back surfaces 28, 28.

Here, the assembly of the connecting strip 22 will be described.
First, the material in the state (expanded state) before the bending of the connecting strip portion 22 shown in FIG. 11 is valley-folded around the boundary line 29 between the coupling portion 26 and the rising portion 27. Next, the bent portions 23a and 23a of the bent portion 23 and the boundary line 30 between the upper surface portion 25 and the rising portion 27 are each folded in a mountain. Then, the back surface portions 28 and 28 are formed on the opposite side of the coupling portion 26 with the rising portion 27 interposed therebetween.
Incidentally, the short direction of the width of the connection strip 22 is W ₁ of the bent portion 14 is formed (see FIG. 9).
Also in the interphase insulating paper 21 having such a configuration, it is possible to obtain the same operational effects as those of the connecting strip portion 13 of the first embodiment.

12 and 13 show a third embodiment of the present invention. The material of the connecting strip 32 of the interphase insulating paper 31 is the same as the connecting strips 13 and 22 of the first and second embodiments. Different. That is, the connecting strips 13 and 22 of the first and second embodiments are made of the same polyamide-based resin material as the interphase insulating paper main body 12, but the connecting strip 32 of the present embodiment is the interphase insulating paper main body. It is made of a material having a bending strength greater than 12, such as PET (polyethylene terephthalate). In this case, the connecting strip portion 32 has a planar shape, and both end portions in the longitudinal direction of the connecting strip portion 32 become the connecting portions 33 and 33. One surface, for example, the back surface (the lower surface in the drawing) of the coupling portions 33, 33 is coupled to the interphase insulating paper body 12 by welding or adhesion. Incidentally, the short direction of the width of the connection strip portion 32 is W _1.

  When the connecting strip 32 is inserted into the semi-closed slot 6 (see FIG. 7), the connecting strip 32 is arranged so that the short direction of the connecting strip 32 intersects the width direction of the opening of the semi-closed slot 6. Is inserted into the semi-closed slot 6, and after the insertion, the direction of the connecting strip 32 is changed so that the short direction of the connecting strip 32 and the direction of the width of the semi-closed slot 6 are the same (concentric circle).

By configuring the connection strip 32 of the connection strip 32 with a material having a bending strength greater than that of the interphase insulating paper body 12, the connection strip 32 can be made difficult to bend. Further, since the width dimension W _{1 in} the short direction of the connecting strip 13 is larger than the width dimension W ₂ of the opening of the semi-closed slot 6, the connecting strip 32 is not affected even if a bending force is applied to the connecting strip 32. The opening of the semi-closed slot 6 abuts on the inner peripheral surface (wall) on the semi-closed slot 6 side, and the bending of the connecting strip 32 can be prevented as much as possible.

The present invention is not limited to the embodiment described above and shown in the drawings, and the following modifications and expansions are possible.
The connecting strips having the bent portions of the first and second embodiments may be configured integrally with the interphase insulating paper main body by a press device using the elasticity of the material.
When the connecting strip portion of the first and second embodiments is inserted into the semi-closed slot, the connecting portion may be inserted so as to be positioned on the inner peripheral side of the stator core.
You may couple | bond so that an interphase insulation paper main body may be located in the surface side of the coupling | bond part of the connection strip part of 1st thru | or 3rd embodiment.

The bent portion of the first embodiment may be formed in a semicircular arc shape.
You may form a bending part in the connection strip part of 3rd Embodiment.
For the sake of convenience, the case where the bent portion is folded so that the bent portion is formed on the front side and the upper side in the drawing with respect to the paper surface in the figure is a mountain fold, and the bent portion is on the back side and the lower side in the drawing with respect to the paper surface. Although the case of folding so as to be formed has been described as valley folding, the direction of mountain folding or valley folding may be reversed.

Although the interphase insulating paper of the rotating electrical machine of the present invention has been described as applied to a semi-closed slot, it can also be applied to an open slot (W ₂ and W ₃ have the same dimensions). Moreover, although the interphase insulating paper of the rotating electrical machine of the present invention has been described as applied to a three-phase coil, it can also be applied to a multi-phase coil other than a three-phase coil. Furthermore, the above-described components and the like can be appropriately changed.

The perspective view of the phase insulation paper of the rotary electric machine which shows the 1st Embodiment of this invention FIG. 1 is an enlarged sectional view taken along line AA in FIG. Partial enlarged perspective view of the connecting strip Partial expansion of the connecting strip Side view schematically showing the overall structure of the stator Partial enlarged view schematically showing the slot Cross-sectional view of stator before shaping coil end FIG. 1 equivalent diagram showing a second embodiment of the present invention FIG. 8 is an enlarged cross-sectional view taken along line BB in FIG. 3 equivalent figure 4 equivalent diagram Exploded view of interphase insulating paper of a rotating electrical machine showing a third embodiment of the present invention 1 equivalent diagram Front view showing interphase insulating paper of a conventional rotating electrical machine

Explanation of symbols

  In the drawings, 1 is a stator, 2 is a stator core, 2a is an end, 3 is a U-phase coil, 3a, 4a, and 5a are coil end portions, 4 is a V-phase coil, 5 is a W-phase coil, and 6 is half Closed slots (slots) 11, 21 and 31 are interphase insulating papers, 12 is an insulating paper body, 13, 22 and 32 are connecting strips, and 14 and 23 are bent portions.

Claims (6)

A pair of interphase insulating paper bodies formed in a shape capable of insulating between coil end portions of a plurality of phases at both axial end portions of the stator core; and
Connecting the pair of interphase insulating paper main bodies, and having a connecting strip located in the slot of the stator core,
An interphase insulating paper for a rotating electrical machine, wherein the connecting strip is formed with a bent portion extending in the longitudinal direction of the connecting strip.   The interphase insulating paper for a rotating electrical machine according to claim 1, wherein the bent portion of the connecting strip is formed in a mountain fold shape or a valley fold shape.   The interphase insulating paper for a rotating electrical machine according to claim 1, wherein the bent portion of the connecting strip is formed in a laterally U shape. If the short dimension of the connection strip portion curved portion is formed as a W _1, the width of the opening of the stator core slot and W _2, the maximum width of the slot and the W _3,
The interphase insulating paper for a rotating electrical machine according to any one of claims 1 to 3, wherein a relationship of W ₂ × 1.1 ≦ W ₁ ≦ W ₃ × 0.9 is satisfied. A pair of interphase insulating paper bodies formed in a shape capable of insulating between coil end portions of a plurality of phases at both axial end portions of the stator core; and
Connecting the pair of interphase insulating paper main bodies, and having a connecting strip located in the slot of the stator core,
The interphase insulating paper for a rotating electrical machine, wherein the connecting strip is made of a material having a bending strength greater than that of the interphase insulating paper main body. A stator core,
A multi-phase coil mounted on the stator core;
A stator of a rotating electric machine comprising the interphase insulating paper according to any one of claims 1 to 5.

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