JP2016046890A - Slot insulation paper, stator, rotary electric machine, and manufacturing method of stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slot insulation paper which achieves downsizing of a stator and prevents surface discharge, and to provide a stator, a rotary electric machine, and a manufacturing method of the stator.SOLUTION: A slot insulation paper 23 is disposed in a slot 21C so as to electrically insulate a coil 22 inserted into the slot 21C of a stator core 21 of a rotary electric machine 100 from the stator core 21. The slot insulation paper 23 includes: a hard layer 23A made of a hard material; a soft layer 23B laminated on the hard layer 23A and made of a soft material. Fragile portions, which are provided along a rotary shaft direction of a rotor 10, are formed in the hard layer 23A of the hard layer 23A and the soft layer 23B located at positions protruding from the slot 21C.SELECTED DRAWING: Figure 4B

Description

  The present invention relates to slot insulating paper, a stator, a rotating electrical machine, and a method for manufacturing a stator.

  2. Description of the Related Art Conventionally, a method for manufacturing a stator of a rotating electrical machine by assembling windings on a stator core is known.

  Patent Document 1 discloses a stator in which slot insulating paper is disposed from the stator core slot to the vicinity of the coil end of the winding in order to insulate the winding from the stator core. Moreover, in patent document 1, in order to form a coil end, a coil | winding is bent after extending in the rotating shaft direction of a rotor.

JP 2012-34453 A

  However, as disclosed in Patent Document 1, the position where the winding is bent is separated from the end of the stator core from the viewpoint of securing a distance where creeping discharge does not occur between the stator core and the winding. . The coil end is formed so as to protrude higher in the rotor rotation axis direction by the amount that the winding position is separated from the end of the stator core. Therefore, there is a problem that the stator becomes large.

  On the other hand, when the winding is bent from the position where the slot insulating paper is disposed in order to suppress the height of the coil end in the rotor rotation axis direction, the slot insulating paper is pressed against the bent winding. It will be torn. In the portion where the slot insulating paper is torn, the slot insulating paper cannot secure a distance where the creeping discharge does not occur, and thus there is a problem that creeping discharge occurs between the stator core and the winding.

  Accordingly, the present invention has been made in view of the above-described problems, and provides a slot insulating paper, a stator, a rotating electrical machine, and a method for manufacturing a stator that can achieve both downsizing of the stator and prevention of creeping discharge. Objective.

  The slot insulating paper according to an aspect of the present invention is disposed in the slot so as to electrically insulate the winding inserted into the slot of the stator core of the rotating electrical machine from the stator core. The slot insulating paper has a hard layer made of a hard material and a soft layer made of a soft material laminated on the hard layer. Among the hard layer and the soft layer protruding from the slot, the hard layer is formed with a plurality of fragile portions provided along the rotation axis direction of the rotor.

  According to the above aspect, the fragile portion of the hard layer of the slot insulating paper is cleaved corresponding to the shape of the winding, and the soft layer extends flexibly without breaking corresponding to the shape of the winding. For this reason, it can be deformed so that the slot insulation paper follows the shape of the winding, so that the coil end can be bent near the end of the stator core within a range that can prevent creeping discharge, and the stator can be miniaturized. Can do.

FIG. 1 is a partial cross-sectional view of a rotating electrical machine having a rotor and a stator according to a first embodiment of the present invention. FIG. 2 is a perspective view of a stator core provided with the slot insulating paper according to the first embodiment of the present invention. FIG. 3 is a partial perspective view when windings are assembled to the stator core according to the first embodiment of the present invention. 4A is a partial cross-sectional view of the stator core, the windings, and the slot insulating paper along the line IVa in FIG. 4B is a partial cross-sectional view of the winding and the slot insulating paper taken along line IVb of FIG. FIG. 5 is a partial perspective view of the slot insulating paper disposing step of disposing slot insulating paper in the slots of the stator core according to the first embodiment of the present invention. FIG. 6 is a partial perspective view of a winding insertion step of inserting a winding into the slot of the stator core according to the first embodiment of the present invention. FIG. 7 is a partial cross-sectional view of the winding and the slot insulating paper after the winding bending process of the first embodiment of the present invention. FIG. 8 is a partial perspective view of a winding bending process for bending the tip of the winding inserted into the slot of the stator core according to the first embodiment of the present invention. FIG. 9A is a partial cross-sectional view of the slot insulating paper according to the first embodiment of the present invention before being disposed in the slot. FIG. 9B is a partial cross-sectional view of the slot insulating paper of the first modified example of the first embodiment. FIG. 9C is a partial cross-sectional view of the slot insulating paper of the second modification example of the first embodiment. FIG. 10A is a partial cross-sectional view of the stator core, the winding, and the slot insulating paper at the slot liner position according to the second embodiment of the present invention. FIG. 10B is a partial cross-sectional view of the winding and the slot insulating paper at the slot protruding position according to the second embodiment of the present invention. FIG. 11A is a partial cross-sectional view of the slot insulating paper according to the second embodiment of the present invention before being disposed in the slot. FIG. 11B is a partial cross-sectional view of the slot insulating paper of the first modification example of the second embodiment. FIG. 11C is a partial cross-sectional view of the slot insulating paper of the second modified example of the second embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a partial cross-sectional view of a rotating electrical machine 100 having a rotor 10 and a stator 20 according to a first embodiment of the present invention.

  A rotating electrical machine 100 illustrated in FIG. 1 includes a rotor 10 that is rotatably arranged, a stator 20 that is provided in an annular shape so as to surround the outer periphery of the rotor 10, and a case member 30 that accommodates the rotor 10 and the stator 20 therein. .

  The rotor 10 includes a shaft member 11 that is a rod-like member extending in the rotation axis direction of the rotor 10, a rotor core 12 that is disposed on the outer peripheral side of the shaft member 11, and an end plate 13 that is disposed in contact with the rotor core 12. And comprising.

  The case member 30 is a cylindrical housing that protects the rotor 10 and the stator 20. The case member 30 holds the stator 20 on the inner peripheral surface of the case member 30. The case member 30 holds the shaft member 11 of the rotor 10 with a bearing 31 installed at the inner diameter end of the case member 30.

  1 to 3, the stator 20 includes an annular stator core 21, a winding 22 inserted into a slot 21C of the stator core 21, and a slot insulating paper 23 disposed in the slot 21C. Prepare.

  Hereinafter, the detailed configuration of the stator 20 will be described with reference to FIGS. 2 and 3. FIG. 2 is a perspective view of the stator core 21 provided with the slot insulating paper 23. FIG. 3 is a partial perspective view when the winding 22 is assembled to the stator core 21.

  As shown in FIG. 2, the stator core 21 is formed in an annular shape by connecting a plurality of, for example, six divided cores 21 </ b> A along the circumferential direction. Each divided core 21A is formed by laminating electromagnetic steel sheets. Each divided core 21A is provided with, for example, eight tooth portions 21B protruding in the inner diameter direction, and a slot 21C as a space is formed between adjacent tooth portions 21B. Further, by connecting the split cores 21A, a slot 21C is formed between the teeth 21B of the adjacent split cores 21A.

  The slot insulating paper 23 is an insulating member disposed in the slot 21 </ b> C of the stator core 21. The slot insulating paper 23 is formed so that the length in the longitudinal direction is longer than that of the slot 21C. For this reason, as shown in FIG. 1, when the slot insulating paper 23 is disposed in the slot 21C, both ends of the slot insulating paper 23 protrude from the slot 21C and protrude from both ends of the stator core 21 in the direction of the rotation axis of the rotor 10. It becomes a state.

  The winding 22 is a rectangular electric wire whose outer periphery is covered with an insulating coating material. The winding 22 is disposed on the side surface of the tooth portion 21B so as to be inserted into the slot 21C of the stator core 21 as shown in FIG. The winding 22 has an in-slot winding 22A inserted into the slot 21C and a coil end 22B protruding from the slot 21C. In FIG. 3, the slot insulating paper 23 is not shown so that the positional relationship between the winding 22 and the slot 21C can be easily understood. In addition to the rectangular type, for example, a cylindrical electric wire may be used for the winding 22.

  Here, with reference to FIG. 4A and FIG. 4B, the positional relationship of one slot 21C of the stator core 21, the coil | winding 22, and the slot insulating paper 23 is demonstrated. 4A is a partial cross-sectional view of the stator core 21, the winding 22, and the slot insulating paper 23 along the line IVa in FIG. 4B is a partial cross-sectional view of the winding 22 and the slot insulating paper 23 taken along the line IVb of FIG.

  As shown in FIG. 4A, a slot insulating paper 23 is disposed in a U-shape in one slot 21 C of the stator core 21, and a winding 22 is inserted inside the slot insulating paper 23.

  As shown in FIGS. 4A and 4B, a plurality of windings 22, for example, four, are inserted into one slot 21C.

  As shown in FIG. 4A, the in-slot winding 22A of the winding 22 is fixed at the inserted position in the slot 21C by impregnating the varnish 24 from the periphery. The fixed in-slot winding 22 </ b> A is electrically insulated from the stator core 21 and the in-slot winding 22 </ b> A of the other winding 22 by the insulating coating material of the winding 22, the slot insulating paper 23, and the varnish 24. Note that an insulating resin mold may be used to fix the in-slot winding 22A.

  The coil end 22B of the winding 22 is disposed outside the stator core 21 as shown in FIG. One end of the coil end 22B is electrically connected to the in-slot winding 22A inserted in the slot 21C, and the other end is connected to the in-slot winding 22A in the other slot 21C. Further, the coil end 22B is disposed away from the coil end 22B of the other winding 22. For this reason, the coil end 22B is electrically insulated from the coil ends 22B of the other windings 22 by the insulating coating material and the air layer. Further, the coil end 22B is electrically insulated from the stator core 21 by the insulating coating material of the winding 22 and the slot insulating paper 23 as shown in FIG. 4B.

  As shown in FIGS. 4A and 4B, the slot insulating paper 23 is an insulating sheet member that is laminated and formed in a three-layer structure with a hard layer 23A and a soft layer 23B. The slot insulating paper 23 is disposed in the slot 21C and surrounds the in-slot winding 22A, and projects outward from the slot 21C and surrounds the vicinity of the coil end 22B of the winding 22. Here, a position where the slot insulating paper 23 is disposed in the slot 21C so as to surround the in-slot winding 22A is referred to as a slot liner position. A position where the slot insulating paper 23 protrudes from the slot 21C so as to surround the vicinity of the coil end 22B of the winding 22 is referred to as a slot protruding position.

  The hard layer 23 </ b> A is disposed on both surface layers of the slot insulating paper 23. A soft layer 23B is disposed between the two hard layers 23A. The hard layer 23A is an insulating sheet member made of, for example, a material of polyamide, polyethylene terephthalate, polyphenylene sulfide, polyethylene naphthalate, polyimide, or a combination thereof.

  On the surface of the hard layer 23A, as shown in FIG. 4B, a notch 23C is formed at the slot protruding position. The notch 23C is formed only on the surface side of the slot insulating paper 23 at a predetermined depth so as not to penetrate the hard layer 23A. The cutout portion 23C is formed along the rotation axis direction of the rotor 10 so that the hard layer 23A can be cleaved. As shown in FIG. 4B, the notch portion 23C has a linear notch portion 23C as a fragile portion between adjacent windings 22 at a predetermined interval Δw or near the outer end of the winding 22 A plurality are formed. The interval Δw is an interval set corresponding to the width of the winding 22 and is set slightly wider than the width of the winding 22.

  The soft layer 23 </ b> B is disposed as an intermediate layer of the slot insulating paper 23. The soft layer 23B is an insulating sheet member that is formed of a rubber-like elastic material and can be stretched at an elongation rate of 100% or more. Further, the soft layer 23B is formed of an adhesive material. The soft layer 23B is formed of, for example, a rubber composition including at least one non-diene rubber. The non-diene rubber is a rubber composition having no or almost no double bond in the polymer main chain and having a low chemical reactivity and an excellent durability. For the soft layer 23B, preferably, butyl rubber, thermoplastic polyurethane rubber, or silicone rubber is selected from non-diene rubbers.

  Next, a method for manufacturing the stator 20 using the slot insulating paper 23 will be described with reference to FIGS.

  First, referring to FIG. 5, the slot insulating paper disposing process for disposing the slot insulating paper 23 in the slot 21 </ b> C of the stator core 21 will be described. FIG. 5 is a partial perspective view of the slot insulating paper placement step.

  In the slot insulating paper arrangement process, the slot insulating paper 23 is arranged along the inner peripheral surface of the slot 21C of the stator core 21. The slot insulating paper 23 is folded in advance in a U shape in accordance with the shape of the inner peripheral surface of the slot 21C, and is easily inserted into the slot 21C. When the slot insulating paper 23 is disposed in the slot 21C, the slot protruding position of the slot insulating paper 23 protrudes outward from the slot 21C, and the slot liner position is accommodated in the slot 21C. Further, in the hard layer 23A of the slot insulating paper 23, a notch 23C is formed at the slot protruding position as shown in FIG. 4B, but is not formed at the slot liner position as shown in FIG. 4A. . Therefore, even when a load is applied to the slot insulating paper 23 when the slot insulating paper 23 is disposed in the slot 21C, it is possible to prevent the hard layer 23A of the slot insulating paper 23 from being cleaved at the slot liner position. Therefore, when the slot insulating paper 23 is supported in the slot liner position in order to dispose the slot insulating paper 23 in the slot 21C, or when pressure is applied to bring the slot 21C and the slot insulating paper 23 into close contact with each other, the hard It is possible to prevent the layer 23A from being cleaved.

  With reference to FIG. 6, the winding insertion process of inserting the winding 22 into the slot 21C will be described. FIG. 6 is a partial perspective view of the winding insertion process.

  In the winding insertion process, the tip of the winding 22 is inserted into the slot 21 </ b> C of the stator core 21. One end of the winding 22 is formed with a tip extending linearly from the in-slot winding 22A. For this reason, from the tip of the winding 22 to the in-slot winding 22A can be easily inserted into the slot 21C. In the slot 21C, the slot insulating paper 23 is disposed in the slot insulating paper disposing step, and the inserted winding 22 is surrounded by the slot insulating paper 23. The in-slot winding 22A inserted into the slot 21C is then fixed at the inserted position by being impregnated with the varnish 24.

  A coil end 22 </ b> B is formed at the other end of the winding 22. FIG. 7 is a partial cross-sectional view of the winding 22 and the slot insulating paper 23 protruding from the slot 21C. As shown in FIG. 7, the winding 22 is inserted until a predetermined distance H1 is reached between the coil end 22B at the other end and the slot 21C. The distance H1 is set to a distance shorter than the protruding length L of the slot insulating paper 23 protruding from the slot 21C. The distance H1 is set to a distance at which creeping discharge does not occur between the coil end 22B and the stator core 21. When the winding 22 is arranged in this way, the slot insulating paper 23 at the slot projecting position is pressed against the bent portion near the coil end 22B of the winding 22 to correspond to the shape of the bent winding 22. It deforms as follows.

  The slot protruding position of the slot insulating paper 23 is a position surrounding the vicinity of the coil end 22 </ b> B of the winding 22. As shown in FIG. 4B, the slot insulating paper 23 at the slot protruding position has a notch 23C formed in the hard layer 23A. For this reason, the hard layer 23A of the slot insulating paper 23 is pressed and bent along the notch 23C by being pressed by the bent portion in the vicinity of the coil end 22B of the winding 22. On the other hand, the soft layer 23 </ b> B that integrally holds the hard layer 23 </ b> A is stretched by being pressed by the bent portion of the winding 22. The soft layer 23B is exposed to the surface side from the fractured portion of the hard layer 23A on the surface side and is in direct contact with the winding 22. For this reason, the soft layer 23 </ b> B is stretched corresponding to the bent shape of the winding 22. The slot insulating paper 23 does not hinder insertion of the winding 22 because the hard layer 23A is broken and the soft layer 23B is stretched so as to correspond to the bent shape of the winding 22.

  With reference to FIG. 8, the winding bending process for bending the tip of the inserted winding 22 to form the coil end 22B will be described. FIG. 8 is a partial perspective view of the winding bending process.

  In the winding bending process, the coil end 22B is formed so that the tip of the winding 22 protruding through the slot 21C is bent and electrically connected to the tip of the other winding 22. By bending the tip of the winding 22, the slot insulating paper 23 protruding from the slot 21 </ b> C and disposed around the winding 22 is also deformed so as to correspond to the bent shape of the winding 22. When the slot insulating paper 23 is deformed, the hard layer 23A of the slot insulating paper 23 is cleaved along the notch 23C, and the soft layer 23B is stretched along the shape of the winding 22 to be bent. For this reason, the slot insulating paper 23 does not prevent the winding 22 from bending. Further, in the vicinity of the coil end 22B of the winding 22, a slot insulating paper 23 in which the hard layer 23A is broken and the soft layer 23B is extended is disposed.

  According to the slot insulating paper 23 according to the first embodiment described above, the following effects can be obtained.

  The slot insulating paper 23 according to the present embodiment is disposed in the slot 21C so as to electrically insulate the winding 22 inserted into the slot 21C of the stator core 21 of the rotating electrical machine 100 from the stator core 21. The slot insulating paper 23 has a hard layer 23A made of a hard material and a soft layer 23B made of a soft material laminated on the hard layer 23A. Of the hard layer 23A and the soft layer 23B that protrude from the slot 21C, the hard layer 23A is formed with a plurality of cutout portions 23C as weak portions provided along the rotation axis direction of the rotor 10.

  According to such slot insulating paper 23, the weak part of the hard layer 23 </ b> A of the slot insulating paper 23 is cleaved corresponding to the shape of the winding 22, and the soft layer 23 </ b> B is flexible corresponding to the shape of the winding 22. Deform. For this reason, since the slot insulating paper 23 can be deformed so as to follow the shape of the winding 22, the coil end 22 </ b> B can be lowered and the stator 20 can be miniaturized within a range in which creeping discharge can be prevented.

  In the slot insulating paper 23 according to the present embodiment, the notch portion 23 </ b> C as the weak portion of the hard layer 23 </ b> A is provided at a position corresponding to the width of the winding 22.

  According to such slot insulating paper 23, the slot 22 can be cleaved at the fragile portion of the hard layer 23 </ b> A of the slot insulating paper 23 corresponding to the shape of the winding 22 bent at a position corresponding to the width of the winding 22. Therefore, the vicinity of the coil end 22B of the winding 22 can be covered more stably and accurately. For this reason, even when the coil end 22B is lowered to make the stator 20 small, the coil end 22B and the stator core 21 can be reliably insulated.

  The slot insulating paper 23 according to the present embodiment is laminated and formed to have a three-layer structure by a hard layer 23A and a soft layer 23B. The soft layer 23B is disposed between the two hard layers 23A.

  According to such slot insulating paper 23, the weak part of the hard layer 23A on the surface side of the slot insulating paper 23 is cleaved, and the soft layer 23B of the intermediate layer is greatly deformed. For this reason, it can coat | cover corresponding to the shape where the coil | winding 22 bends exactly, and can prevent creeping discharge stably. Further, since the soft layer 23B is covered inside the slot insulating paper 23 until the fragile portion of the hard layer 23A is cleaved, the slot insulating paper 23 is placed in the slot 21C without being caught around the soft layer 23B. Easy to insert.

  In the slot insulating paper 23 according to the present embodiment, the weak part of the hard layer 23A is a linear notch 23C formed on the surface of the hard layer 23A.

  According to such slot insulating paper 23, since the notch 23C serving as the starting point of the tear is formed in the hard layer 23A in advance, the hard layer 23A is stably positioned corresponding to the shape of the winding 22 to be bent. Can be broken. For this reason, since the soft layer 23B can cover the vicinity of the coil end 22B of the winding 22 accurately and stably, the coil end 22B and the stator core 21 can be reliably insulated. Further, since the cleavage direction of the hard layer 23A is guided by the linear notch 23C, the hard layer 23A can be stably broken along the rotation axis direction of the rotor 10. For this reason, the winding 22 in which the soft layer 23B bends can be covered accurately and stably. In addition, the fragile portion is formed by a simple process such as a slit process because the notch 23C is simply provided on the surface of the hard layer 23A.

  In the slot insulating paper 23 according to the present embodiment, the material of the hard layer 23A is polyamide, polyethylene terephthalate, polyphenylene sulfide, polyethylene naphthalate, polyimide, or a combination thereof.

  According to such slot insulating paper 23, the material of the hard layer 23A is formed of a material with good workability, so that the fragile portion can be easily formed. Further, since the hard layer 23A is formed of a material that is frequently used industrially, the slot insulating paper 23 can be manufactured at a low cost.

  In the slot insulating paper 23 according to the present embodiment, the soft layer 23B is formed of a material whose elongation at break is set to 100% or more. The soft layer 23B is a rubber composition including at least one non-diene rubber. Further, the soft layer 23B is formed of an adhesive material, and the hard layer 23A is integrally held by the adhesive soft layer 23B.

  According to such slot insulating paper 23, the soft layer 23B extends 100% or more when the hard layer 23A is broken, and therefore, the shape of the winding 22 can be handled with good followability. Further, since the soft layer 23B is formed of a rubber composition that includes elasticity and has high durability and includes non-diene rubber, the soft layer 23B extends without difficulty according to the shape of the winding 22. be able to. Furthermore, since the adhesive soft layer 23B directly holds the hard layer 23A, no other holding member is required, and the slot insulating paper 23 can be formed at low cost. Since the soft layer 23B can adhere to the winding 22 when deformed in accordance with the shape of the winding 22, the position of the slot insulating paper 23 does not shift.

  Further, if the stator 20 is manufactured using such slot insulating paper 23, the stator 20 having the above-described effects can be obtained. The same effect can also be obtained with the rotating electrical machine 100 including such a stator 20.

  In addition, the notch part 23C formed in the hard layer 23A of this embodiment is not restricted to the aspect of this embodiment as shown to FIG. 9A. 9A to 9C are partial cross-sectional views of the slot insulating paper 23 showing various exemplary embodiments of the notch 23C. As shown in FIG. 9B, the linear notch 23C may be formed so as to penetrate the hard layer 23A. Thus, the break position of the hard layer 23A can be further stabilized by forming the notch 23C in advance. Moreover, as shown in FIG. 9C, the linear cutout portions 23C may be formed on both surface sides of the hard layer 23A.

(Second Embodiment)
The slot insulating paper 23 according to the second embodiment will be described with reference to FIGS. 10A and 10B. FIG. 10A is a partial cross-sectional view of the stator core 21, the winding 22, and the slot insulating paper 23 at the slot liner position according to the second embodiment of the present invention, and FIG. 10B is the winding 22 and the slot insulating paper 23 at the slot protruding position. FIG. In the following embodiments, the same functions as those in the first embodiment are denoted by the same reference numerals, and repeated description will be omitted as appropriate.

  As shown in FIGS. 10A and 10B, the slot insulating paper 23 according to the second embodiment is laminated and formed by a hard layer 23A and a soft layer 23B so as to have a two-layer structure. On the surface of the hard layer 23A at the slot protruding position, as shown in FIG. 10B, a notch portion 23C as a fragile portion is formed.

  The cutout portion 23C is formed along the rotation axis direction of the rotor 10 so that the hard layer 23A can be cleaved, and the cross-sectional shape is processed into a V shape. A plurality of notches 23C are formed on the surface of the hard layer 23A at a predetermined interval Δw.

  In the slot insulating paper arranging step of the stator 20 using the slot insulating paper 23 according to the second embodiment, the slot insulating paper 23 is arranged in a U shape in the slot 21C of the stator core 21 as in the first embodiment. The

  At this time, the soft layer 23B is disposed outside the slot insulating paper 23 so as to be in contact with the inner peripheral surface of the slot 21C. The hard layer 23 </ b> A is disposed inside the slot insulating paper 23 so as to face the winding 22.

  In the winding insertion step, the winding 22 having the coil end 22B formed at the other end is inserted into the slot 21C of the stator core 21 as in the first embodiment. By inserting the winding 22 into the slot 21C, the slot insulating paper 23 is pressed and deformed by the bent portion of the winding 22 near the coil end 22B. In the slot insulating paper 23, the hard layer 23A disposed on the inner side is cleaved from the notch 23C, and the soft layer 23B disposed on the outer side is in contact with the vicinity of the coil end 22B of the winding 22 at the broken portion. For this reason, the soft layer 23 </ b> B is stretched corresponding to the bent shape of the winding 22.

  In the winding bending process, the coil end 22B is formed by bending the tip of the winding 22 penetrating the slot 21C. By bending the tip of the winding 22, the slot insulating paper 23 disposed around the winding 22 is also deformed to correspond to the bent shape of the winding 22. Due to the deformation of the slot insulating paper 23, the hard layer 23A disposed on the inner side is cleaved and broken from the notch 23C, and the soft layer 23B disposed on the outer side is stretched so as to correspond to the bent shape of the winding.

  According to the slot insulating paper 23 according to the second embodiment described above, the following effects can be obtained.

  The slot insulating paper 23 according to the present embodiment is laminated and formed to have a two-layer structure by a hard layer 23A and a soft layer 23B.

  According to such slot insulating paper 23, the notch 23C of the hard layer 23A disposed inside the slot 21C of the stator core 21 is cleaved, and the soft layer 23B of the intermediate layer is greatly deformed. For this reason, the vicinity of the coil end 22B of the winding 22 can be covered corresponding to the bent shape of the winding 22 accurately, and creeping discharge can be stably prevented. In the winding insertion process, since the hard layer 23A of the slot insulating paper 23 is disposed inside the slot 21C, the winding 22 is simply attached to the soft layer 23B and is not caught. Can be inserted into the slot 21C. Further, since the slot insulating paper 23 is attached to the inner peripheral surface of the slot 21C due to the adhesiveness of the soft layer 23B, it is not necessary to introduce an adhesive member, and the manufacturing efficiency of the stator 20 can be increased.

  In the slot insulating paper 23 according to the present embodiment, the notch 23C of the hard layer 23A is formed in a V shape.

  According to such slot insulating paper 23, the tearing direction of the hard layer 23A is guided by the V-shaped cutout portion 23C, so that the hard layer 23A is stably broken along the rotation axis direction of the rotor 10. be able to. For this reason, the soft layer 23 </ b> B can cover the vicinity of the coil end 22 </ b> B of the winding 22 accurately and stably.

  Note that the notch 23C formed in the hard layer 23A of the present embodiment is not limited to the aspect of the present embodiment as shown in FIG. 11A. FIG. 11A to FIG. 11C are partial cross-sectional views of the slot insulating paper 23 showing various examples of the notch 23C. As shown in FIG. 11B, the V-shaped cutout portions 23C may be formed on both surface sides of the hard layer 23A. Since the contact area between the hard layer 23A and the soft layer 23B is increased when the V-shaped notch 23C formed in the hard layer 23A comes into contact with the soft layer 23B, the soft layer 23B is more adhesive and hard. It becomes easy to hold the layer 23A integrally. Further, as shown in FIG. 11C, the V-shaped cutout portions 23C formed on both surface sides of the hard layer 23A may be formed so that one inclined surface is disposed close to each other. By doing in this way, since intensity | strength required for cleavage of the notch part 23C becomes small, the hard layer 23A can be more reliably cleaved.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  For example, the notch 23C may be formed also in the hard layer 23A of the slot liner of the slot insulating paper 23. By doing in this way, the notch part 23C can be formed in the hard layer 23A of the slot protrusion position of both ends at once, and the manufacturing efficiency of the slot insulating paper 23 can be improved. Furthermore, as shown in FIG. 9B, when the cutout portion 23C is formed through, the hard layer 23A can be divided with the cutout portion 23C as a boundary. For this reason, since the notched portion 23C can be easily formed simply by arranging the hard layer 23A divided in advance on the soft layer 23B, the manufacturing efficiency of the slot insulating paper 23 can be further improved. it can.

  Further, the fragile portion is not limited to the cutout portion 23C formed from the surface of the hard layer 23A, and a cutout hole for guiding the cleavage may be provided inside the hard layer 23A along the rotation axis direction of the rotor 10. In the case of the hard layer 23A formed by combining two or more kinds of materials having different toughness, a fragile portion may be formed by disposing a brittle material having low toughness between materials having high toughness. In this way, the hard layer 23A can be cleaved from a portion where a brittle material with low toughness is disposed.

  The slot insulating paper 23 may be disposed in the slot 21C so as to have a surface along the inner peripheral shape of the slot 21C. For example, the slot insulating paper 23 may be folded into a rectangular tube so as to surround the winding 22 from the entire circumference. Good.

  In addition, the said embodiment can be combined suitably.

  For example, you may apply the aspect of the notch part 23C of 2nd Embodiment to 1st Embodiment, and apply the notch part 23C of 1st Embodiment to 2nd Embodiment as the reverse aspect. Also good.

DESCRIPTION OF SYMBOLS 100 Rotating electrical machine 10 Rotor 20 Stator 21 Stator core 21A Split core 21B Teeth part 21C Slot 22 Winding 22A In-slot winding 22B Coil end 23 Slot insulating paper 23A Hard layer 23B Soft layer 23C Notch part 24 Varnish 30 Case member

Claims (14)

Slot insulating paper disposed in the slot to electrically insulate the stator core from the winding inserted in the stator core slot of the rotating electrical machine,
A hard layer made of a hard material,
A soft layer made of a soft material laminated on the hard layer;
Have
Among the hard layer and the soft layer in a position protruding from the slot, the hard layer is formed with a plurality of fragile portions provided along the rotation axis direction of the rotor.
Slot insulation paper characterized by that. The slot insulating paper according to claim 1,
The fragile portion is provided at a position corresponding to the width of the winding.
Slot insulation paper characterized by that. The slot insulating paper according to claim 1 or 2,
The hard layer and the soft layer are laminated to form a two-layer structure,
The hard layer is located on the winding side when disposed in the slot of the stator core;
Slot insulation paper characterized by that. The slot insulating paper according to claim 1 or 2,
The hard layer and the soft layer are laminated to form a three-layer structure,
The soft layer is disposed between the two hard layers.
Slot insulation paper characterized by that. The slot insulating paper according to any one of claims 1 to 4,
The fragile part is a notch formed in the surface of the hard layer.
Slot insulation paper characterized by that. The slot insulating paper according to claim 5,
The notch is formed in a linear shape,
Slot insulation paper characterized by that. The slot insulating paper according to claim 5,
The notch is formed in a V shape,
Slot insulation paper characterized by that. The slot insulating paper according to any one of claims 1 to 7,
The material of the hard layer is polyamide, polyethylene terephthalate, polyphenylene sulfide, polyethylene naphthalate, polyimide, or a combination thereof.
Slot insulation paper characterized by that. The slot insulating paper according to any one of claims 1 to 8,
The soft layer is formed of a material whose elongation is set to an elongation of 100% or more when the fragile portion of the hard layer is broken.
Slot insulation paper characterized by that. The slot insulating paper according to claim 9,
The soft layer is a rubber composition comprising at least one non-diene rubber.
Slot insulation paper characterized by that. The slot insulating paper according to any one of claims 1 to 10,
The soft layer is formed of an adhesive material,
The hard layer is integrally held by the sticky soft layer.
Slot insulation paper characterized by that. A stator core formed in an annular shape;
A winding inserted into a slot of the stator core;
The slot insulating paper according to any one of claims 1 to 11, wherein the slot insulating paper is disposed in the slot and is provided so as to surround the winding.
A stator comprising: The stator according to claim 12,
A rotor rotatably disposed in the stator;
A rotating electric machine comprising: A method of manufacturing a stator using the slot insulating paper according to any one of claims 1 to 11,
Slot insulating paper disposing step of disposing slot insulating paper in the slot of the stator core;
A winding insertion step of inserting the winding into the slot;
A winding bending step of bending the tip of the inserted winding to form a coil end;
A method of manufacturing a stator, comprising:

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