JP2014187856A - Insulation structure of stator core and assembling method of stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure insulation near the mating faces of insulating members adjacent in the circumferential direction, in the insulation structure of a stator core and the assembling method of a stator.SOLUTION: In an insulation structure of a stator core having a yoke formed annularly, and a plurality of teeth projecting radially from the yoke, and divided into a plurality of split cores in the circumferential direction, a portion where the insulating members overlap in the radial direction is provided in the radially deepest part of a slot formed between two teeth adjacent in the circumferential direction. The insulating member is provided for each split core. The insulating members adjacent in the circumferential direction overlap in the radial direction.

Description

  The present invention relates to an insulating structure of a stator core and a method of assembling the stator, and in particular, includes a yoke formed in an annular shape and a plurality of teeth projecting in a radial direction from the yoke, and a plurality of circumferentially extending teeth. A stator provided with an insulating structure for ensuring insulation against a stator coil of a stator core divided into divided cores, and a stator core, and an insulating member provided for each of the divided cores for ensuring insulation of the stator core. It relates to the assembly method.

  Conventionally, an insulation structure for ensuring insulation between a stator core and a stator coil included in a stator is known (see, for example, Patent Document 1). The stator core has a yoke formed in an annular shape and teeth projecting radially inward from the yoke. The above insulating structure surrounds the teeth of the stator core and is arranged at the radially inner side surface of the yoke (specifically, at the radially innermost portion of the slot formed between two teeth adjacent in the circumferential direction). Insulating members that abut the corresponding part) are provided. The insulating member is made of paper, resin, or the like that can form a thin insulating layer.

JP 2010-200492 A

  Incidentally, some stator cores are divided into a plurality of divided cores in the circumferential direction. Thus, in a stator core that is divided into a plurality of divided cores in the circumferential direction, an insulating member is generally provided for each divided core. Therefore, a plurality of insulating members are provided in the circumferential direction. In this case, the insulating member has a circumferentially extending portion that extends to the circumferential end of the split core toward both circumferential sides.

  However, in the insulating structure in which the insulating members having the above structure are arranged adjacent to each other in the circumferential direction, the creepage distance between the stator core and the stator coil (that is, the stator core and the The shortest distance along the surface of the insulating member between the stator coil and the stator coil is small.

  The present invention has been made in view of the above-described points, and has a stator core insulating structure and a stator assembling method capable of ensuring insulation in the vicinity of a mating surface between insulating members adjacent to each other in the circumferential direction. The purpose is to provide.

  The above object is an insulating structure of a stator core divided into a plurality of divided cores in the circumferential direction, having a yoke formed in an annular shape and a plurality of teeth projecting radially from the yoke, This is achieved by the insulating structure of the stator core in which a portion where the insulating member overlaps in the radial direction is provided at the radially innermost portion of the slot formed between the two teeth adjacent in the circumferential direction.

  The object is to provide a stator core divided into a plurality of divided cores in the circumferential direction, having a ring-shaped yoke and a plurality of teeth projecting radially from the yoke, and for each of the divided cores. And a stator assembling method comprising: an insulating member that ensures insulation of the stator core with respect to the stator coil, wherein all the insulating members are formed between the two adjacent teeth in the circumferential direction. A first circumferentially extending portion extending toward one circumferential direction and extending to the circumferential end of the split core, and a second circumferentially extending side. Each of the insulating members is adjacent to one side in the circumferential direction, and the second circumferentially extending portion extends beyond the circumferential end of the split core. The second of the insulating member A circumferentially extending portion and a radial direction overlap with each other, and the second circumferentially extending portion overlaps with the first circumferentially extending portion of the insulating member adjacent to the other circumferential side in the radial direction. The insulating members adjacent to each other in the circumferential direction are arranged such that the second circumferential extension of one of the insulating members is more than the first circumferential extension of the other insulating member. This is achieved by a method of assembling a stator that is assembled so as to be positioned on a radially far side with respect to the core surface in the radially innermost portion of the slot.

  In addition, the object is to provide a stator core that is divided into a plurality of divided cores in the circumferential direction, and that has a yoke formed in an annular shape and a plurality of teeth projecting radially from the yoke, and the divided cores And a stator assembling method comprising: an insulating member that ensures insulation of the stator core with respect to the stator coil, and the insulating member is formed between the two adjacent teeth in the circumferential direction. A first insulating member having a first circumferentially extending portion that is provided at a portion corresponding to the radially innermost portion of the slot and extends to the circumferential end of the divided core toward both circumferential sides; A second insulating member having a second circumferentially extending portion that extends beyond the circumferential end of the divided core toward both sides in the circumferential direction, provided in a portion corresponding to the radially innermost portion of the slot. The first insulating members and the second insulating members are alternately arranged in the circumferential direction, and the insulating members are adjacent to each other in the circumferential direction. The first circumferentially extending portion and the second circumferentially extending portion of the second insulating member are disposed so as to overlap each other in the radial direction, and the insulating members adjacent to each other in the circumferential direction are arranged together. The second circumferentially extending portion of the second insulating member is more than the first circumferentially extending portion of the first insulating member with respect to the innermost core surface in the radial direction of the slot. This is achieved by a method of assembling the stator so as to be positioned on the far side in the radial direction.

  According to the present invention, it is possible to ensure insulation in the vicinity of a mating surface between insulating members adjacent to each other in the circumferential direction.

It is a principal part perspective view of the stator which is 1st Example of this invention. It is a perspective view of the division | segmentation core with an insulation member with which the insulation structure of the stator core of a present Example is provided. It is a block diagram of the split core which comprises the stator core of a present Example. It is a block diagram of the insulating member with which the insulating structure of the stator core of a present Example is provided. It is principal part sectional drawing of the insulation member with which the insulation structure of the stator core of a present Example is provided. It is a figure showing the process at the time of attaching the division | segmentation core with an insulation member with which the insulation structure of the stator core of a present Example is equipped to a stator coil. It is a block diagram just before the assembly | attachment to the stator coil of the split core with an insulation member with which the insulation structure of the stator core of a present Example is provided. It is a block diagram after the assembly | attachment to the stator coil of the split core with an insulation member with which the insulation structure of the stator core of a present Example is provided. It is a block diagram of the 1st insulation member with which the insulation structure of the stator core which is 2nd Example of this invention is provided. It is a block diagram of the 2nd insulation member with which the insulation structure of the stator core of a present Example is provided. It is a block diagram just before the assembly | attachment to the stator coil of the split core with an insulation member with which the insulation structure of the stator core of a present Example is provided. It is a block diagram after assembling the 1st insulation member with which the insulation structure of the stator core of a present Example is provided. It is a block diagram after assembling the 2nd insulation member with which the insulation structure of the stator core of a present Example is provided.

  Hereinafter, specific embodiments of a stator core insulation structure and a stator assembly method according to the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a main part of a stator 10 according to a first embodiment of the present invention. FIG. 2 is a perspective view of a split core with an insulating member provided in the insulating structure of the stator core 12 of this embodiment. 2A shows a diagram viewed from the inside in the radial direction, and FIG. 2B shows a diagram seen from the outside in the radial direction. FIG. 3 shows a configuration diagram of the split cores constituting the stator core 12 of the present embodiment. FIG. 4 shows a configuration diagram of an insulating member provided in the insulating structure of the stator core 12 of the present embodiment. 3A and 4A are views as viewed from the radially inner side, and FIGS. 3B and 4B are views as viewed from the radially outer side, while FIG. ) And FIG. 4C are diagrams as viewed in the direction of arrow III in FIG. 3A, and FIGS. 3D and 4D are diagrams as viewed in the direction of arrow IV in FIG. 3 (E) and FIG. 4 (E) show views as viewed in the direction of arrow V in FIG. 3 (A), respectively. Further, FIG. 5 shows a cross-sectional view of the main part of an insulating member provided in the insulating structure of the stator core 12 of this embodiment.

  In the present embodiment, the stator 10 is a stator used in a rotating electrical machine such as a three-phase AC motor. The stator 10 is disposed radially outside the rotor as a rotor via a predetermined air gap, and generates a magnetic field that rotates the rotor when energized. Stator 10 is bolted to a case where the rotor is rotatably supported.

  The stator 10 includes a stator core 12 and a stator coil 14. The stator core 12 is a member formed in a hollow cylindrical shape, and is formed by laminating a plurality of insulation-coated electromagnetic steel plates in the axial direction. A cylindrical yoke made of a material obtained by compression-molding a soft magnetic powder coated with an insulating coating may be attached to the radially outer surface of the stator core 12.

  The stator core 12 includes a yoke 16 formed in an annular shape, and teeth 18 that protrude from the radially inner side surface of the yoke 16 toward the radially inner side (axial center side). The teeth 18 are tooth-like members extending in the stator axial direction. A plurality of teeth 18 are provided in the circumferential direction on the radially inner side surface of the yoke 16 (for example, 96 pieces as shown in FIG. 1), and are provided at regular intervals along the circumferential direction. A slot 20 is formed between two teeth 18 adjacent in the circumferential direction.

  Each of the teeth 18 is wound with the stator coil 14 described above. The stator coil 14 is composed of a rectangular wire having a rectangular cross section. The stator coil 14 may have a circular cross section instead of a flat wire. A plurality of stator coils 14 are provided in the circumferential direction on the radially inner side of the stator core 12. Each stator coil 14 extends so as to penetrate the slot 20 of the stator core 12 in the axial direction. The stator coil 14 has coil end portions 22, 24 that protrude outward in the axial direction from both axial end portions of the stator core 12.

  Each of the stator coils 14 constitutes one of a U-phase coil, a V-phase coil, and a W-phase coil when the rotating electrical machine is applied to, for example, a three-phase AC motor. In this case, the U-phase coil, the V-phase coil, and the W-phase coil that are the stator coils 14 are wound around the teeth 18 in that order in the circumferential direction.

  The stator core 12 includes a plurality of (for example, 48 as shown in FIG. 1) divided cores 30 divided in the circumferential direction. That is, the stator core 12 is divided into a plurality of divided cores 30 in the circumferential direction. Each of the divided cores 30 is formed by laminating a plurality of insulation-coated electrical steel sheets in the axial direction. All the divided cores 30 have the same shape, and specifically, a shape including the yoke 16-1 and the two teeth 18-1 and 18-2 corresponding to the same circumferential angle. Have.

  The yoke 16-1 of each divided core 30 is a portion corresponding to the radially innermost portion of the slot 20 on the outer side in the circumferential direction of each of the two teeth 18-1 and 18-2 included in the divided core 30 ( That is, it is formed so as to be cut at substantially the center in the circumferential direction of surfaces (hereinafter referred to as slot surfaces) 32, 34 facing the slot 20 on the radially inner side. Hereinafter, a cut surface of the split core 30 facing the circumferential direction of the yoke 16-1 is referred to as a split surface 36. Each divided core 30 has a slot surface 38 that is not cut between the two teeth 18-1 and 18-2 included in the divided core 30 in addition to the slot surfaces 32 and 34.

  Each of the split cores 30 is one of the two teeth 18-1 and 18-2 included in the split core 30 from the root of the teeth 18-1 on one side in the circumferential direction (left-hand side in each figure) to the one in the circumferential direction. First core circumferentially extending portion 40 extending toward the side, and first core circumference extending from the root of teeth 18-2 on the other circumferential side (right-hand side in each figure) toward the other circumferential side Direction extending portion 42. In the split core 30, the first core circumferential extension 40 and the second core circumferential extension 42 are each formed to have substantially the same circumferential width over the axial direction. Further, the first core circumferential extension 40 and the second core circumferential extension 42 are formed to have substantially the same circumferential width.

  The stator 10 also includes an insulating member 44 that ensures insulation between the stator core 12 and the stator coil 14. The insulating member 44 is provided for each divided core 30 of the stator core 12. That is, the same number of insulating members 44 as the number of split cores 30 are provided. The insulating member 44 is made of paper or resin (for example, thermosetting resin or thermoplastic resin), and forms a thin insulating layer between the split core 30 and the stator coil 14. The insulating member 44 is an insulator for ensuring the insulation of the split core 30 with respect to the stator coil 14 and has a shape for realizing such a function.

  The insulating member 44 may be molded separately from the split core 30. Alternatively, the insulating member 44 may be molded by injection molding an insulating material resin after the split core 30 is accommodated in a mold. It may be integrally formed with the split core 30.

  All the insulating members 44 have the same shape. Each insulating member 44 has a shape that matches the shape of the split core 30. That is, each insulating member 44 has a slot portion 46 corresponding to the slot surfaces 32, 34, and 38 of the yoke 16-1, and a tooth portion 48 corresponding to the teeth 18-1 and 18-2. . The slot part 46 and the teeth part 48 are integrally formed.

  The slot portion 46 is a portion formed so as to face the slot surfaces 32, 34, and 38 of the yoke 16-1 in the radial direction. Moreover, the teeth part 48 is a site | part formed so that the teeth 18-1 and 18-2 might be enclosed according to the shape of the teeth 18-1 and 18-2 of the division | segmentation core 30. As shown in FIG. In addition, it is good also as providing the opening surface which opens in the surface which faced the radial direction inner side (axial center side) of the radial direction front-end | tip of the teeth part 48. FIG.

  The slot portion 46 extends from the facing portion toward the outside in the axial direction from the axial end surface of the yoke 16-1 in addition to the facing portion that faces the slot surfaces 32, 34, and 38 in the radial direction. It has a bending portion 50 that curves toward the radially outer side of the axial end face. The curved portions 50 are provided on both sides in the axial direction. The curved portion 50 is provided to ensure a creepage distance in the vicinity of the connecting portion between the axial end surface of the yoke 16-1 and the radially inner side surface.

  Moreover, the teeth part 48 is directed to the axial direction outer side from the axial direction end surface of the teeth 18 from this opposing part other than the opposing part which opposes the surface facing the circumferential direction of the teeth 18-1 and 18-2 in the circumferential direction. And a curved portion 52 that curves inward in the circumferential direction of the axial end surface of the tooth 18. The curved portions 52 are provided on both sides in the axial direction. The curved portion 52 is provided to ensure a creepage distance in the vicinity of the end surface of the tooth 18 in the axial direction.

  The slot portion 46 also includes a first insulating circumferential direction extending portion 54 and a second insulating circumferential direction extending portion 56. The first and second insulating circumferentially extending portions 54 and 56 are connected to the tooth portions 48 corresponding to the two teeth 18-1 and 18-2 included in the split core 30 (that is, the teeth 18). It extends from the base side) to the outside in the circumferential direction.

  The first insulating circumferentially extending portion 54 is directed from the connecting portion with the tooth portion 48 corresponding to the tooth 18-1 on the one circumferential side of the two teeth 18 included in the split core 30 toward the one circumferential side. And extends radially opposite to the slot surface 32 of the yoke 16-1 (that is, the first core circumferential extension 40 of the split core 30). The first insulating circumferentially extending portion 54 extends from the connecting portion with the tooth portion 48 corresponding to the tooth 18-1 toward the circumferential end of the yoke 16-1 of the split core 30 toward one side in the circumferential direction. .

  Moreover, the 2nd insulation circumferential direction extension part 56 is a circumferential direction other side from the connection part with the teeth part 48 corresponding to the teeth 18-2 of the circumferential direction other side among the two teeth 18 contained in the split core 30. And faces the slot surface 34 of the yoke 16-1 (that is, the second core circumferential extension 42 of the split core 30) in the radial direction. The second insulating circumferentially extending portion 56 extends beyond the circumferential end of the yoke 16-1 of the split core 30 from the connecting portion with the tooth portion 48 corresponding to the tooth 18-2 toward the other circumferential side. ing.

  That is, the first insulating circumferential direction extending portion 54 of the insulating member 44 is connected to the tooth portion 48 corresponding to the tooth 18-1 from the peripheral portion of the first core circumferential extending portion 40 of the split core 30. It extends toward the one circumferential side to the same circumferential position with respect to the direction end. In addition, the second insulating circumferentially extending portion 56 of the insulating member 44 is connected to the tooth portion 48 corresponding to the tooth 18-2 from the connection portion of the second core circumferential extending portion 42 of the split core 30. It extends toward the other side in the circumferential direction further to the position on the other side in the circumferential direction than the direction end.

  In the insulating member 44, the circumferential width of the first insulating circumferentially extending portion 54 substantially matches the circumferential width of the first core circumferentially extending portion 40 of the split core 30. The circumferential width of the two insulating circumferentially extending portions 56 is larger than the circumferential width of the second core circumferentially extending portion 42 of the split core 30. As described above, the first core circumferential extension 40 and the second core circumferential extension 42 of the split core 30 have substantially the same circumferential width. For this reason, the circumferential width of the second insulating circumferentially extending portion 56 of the insulating member 44 is larger than the circumferential width of the first insulating circumferentially extending portion 54.

  In the structure of the insulating member 44 described above, when the plurality of divided cores 30 are assembled and arranged in the circumferential direction with the insulating member 44 mounted on each of the divided cores 30 constituting the stator core 12, FIG. As shown in FIG. 2, among all the slots 20 existing in the circumferential direction of the stator core 12, the circumferentially adjacent two split cores 30a and 30b are in contact with each other in the circumferential direction by bringing the split surfaces 36 into contact with each other. In the innermost part, a portion where the insulating members 44a and 44b attached to the two split cores 30a and 30b adjacent to each other in the circumferential direction overlap in the radial direction is formed.

  That is, when attention is paid to one divided core 30, the insulating member 44 of each divided core 30 has an insulating portion in which the first insulating circumferential direction extending portion 54 is adjacent to the self-insulating member 44 on one side in the circumferential direction. The insulating member 44 that overlaps the second insulating circumferential direction extending portion 56 of the member 44 in the radial direction and that is adjacent to the other side in the circumferential direction with respect to the self insulating member 44. It arrange | positions so that it may overlap with the 1st insulating circumferential direction extension part 54 of radial direction.

  Here, the radially innermost slot 20 between the two adjacent cores 30a and 30b adjacent in the circumferential direction brings the split surfaces 36 into contact with each other and the teeth 18 of both the split cores 30a and 30b are adjacent in the peripheral direction. If the insulating structure (contrast insulating structure) formed in the portion is such that the insulating members 44 of the split cores 30a and 30b do not overlap at all in the radial direction, the stator core 12 The creepage distance from the stator coil 14 becomes the shortest, and it may be difficult to ensure the insulation between them.

  On the other hand, as in this embodiment, when the insulating structure formed in the innermost portion of the slot 20 in the radial direction is such that the insulating members 44a and 44b overlap in the radial direction, In comparison, the creeping distance between the stator core 12 and the stator coil 14 can be increased by the overlapping amount of the insulating members 44a and 44b. Therefore, according to the insulating structure of the stator core 12 of the present embodiment, of all the slots 20, the two divided cores 30 a and 30 b adjacent in the circumferential direction contact the divided surfaces 36 to face each other in the circumferential direction. It is possible to ensure insulation between the stator core 12 and the stator coil 14 in the vicinity of the innermost portion in the radial direction, that is, in the vicinity of the mating surface between the insulating members 44 adjacent to each other in the circumferential direction.

  Hereinafter, with reference to FIGS. 6 to 8, a method for assembling the stator 10 according to the present embodiment, specifically, a method for assembling the stator core 12 to the stator coil 14 will be described.

  FIG. 6 is a diagram illustrating a process for assembling the split core with an insulating member included in the insulating structure of the stator core 12 of the present embodiment to the stator coil 14. FIG. 7 shows a configuration diagram of the split core with an insulating member included in the insulating structure of the stator core 12 of the present embodiment immediately before the assembly to the stator coil 14. FIG. 8 shows a configuration diagram of the split core with an insulating member provided in the insulating structure of the stator core 12 of the present embodiment after the stator core 14 is assembled. 7 (A) and 8 (A) are diagrams viewed from the inside in the radial direction, and FIGS. 7 (B) and 8 (B) are diagrams viewed in the direction of arrow III in FIG. 7 (A). 7 (C) and FIG. 8 (C) are views seen in the direction of arrow IV in FIG. 7 (A), and FIG. 7 (D) and FIG. The figure seen by the arrow V in is shown, respectively.

  In the present embodiment, first, an annular coil assembly 60 in which a plurality of stator coils 14 are arranged in the circumferential direction is prepared (FIG. 6A). The coil assembly 60 is formed with a straight portion of the stator coil 14 disposed in the slot 20 of the stator core 12 and a through hole 62 penetrating in the radial direction into which the teeth 18 of the stator core 12 can be inserted. And after attaching the insulating member 44 to each division | segmentation core 30 which comprises the stator core 12, all the division | segmentation cores 30 with which these insulation members 44 were equipped are arrange | positioned radially outside with respect to said coil assembly 60. FIG. (FIG. 6 (B) and FIG. 7).

  Next, the divided core 30 and the insulating member 44 attached to the divided core 30 are divided into the first insulating circumferential direction extending portion 54 of the insulating member 44 adjacent to the divided core 30 on one side in the circumferential direction. The second insulating circumferentially extending portion 56 of the insulating member 44 of the core 30 overlaps with the second insulating circumferentially extending portion 56 in the radial direction. The coil assembly 60 is assembled so as to overlap the first insulating circumferential direction extending portion 54 of the insulating member 44 of the split core 30 adjacent to the side in the radial direction.

  Specifically, two circumferentially adjacent divided cores 30 and insulating members 44 are arranged in a circumferential direction in which the second insulating circumferentially extending portion 56 of the insulating member 44 overlaps in the radial direction between the divided cores 30. The second insulating circumferential direction extending portion 56 of the insulating member 44 a on the one side split core 30 a side is located on the radially inner side, and the first insulating circumferential direction of the insulating member 44 is between these split cores 30. With respect to the coil assembly 60, the first insulating circumferentially extending portion 54 of the insulating member 44 b on the other split core 30 b side on the other circumferential side where the extending portion 54 overlaps in the radial direction is positioned on the radially outer side. Assemble (FIGS. 5 and 8).

  That is, the two split cores 30 and the insulating member 44 that are adjacent to each other in the circumferential direction are separated from each other by the second insulating circumferentially extending portion 56 on the split core 30a side on the one side in the circumferential direction. The coil assembly 60 is assembled so as to be positioned on the radially inner side (radially far side) with respect to the slot surfaces 32 and 34 with respect to the first insulating circumferential direction extending portion 54.

  The above assembly is performed by assembling all the divided cores 30 and all the insulating members 44 constituting the stator core 12 at a desired position at the same time with respect to the coil assembly 60. After the insulating member 44 is annularly combined on the outer side in the radial direction than the desired position on the coil assembly 60, the teeth 18 are simultaneously moved inward in the radial direction so as to be inserted into the through hole 62 of the coil assembly 60. It is realized by.

  According to the above assembly method, when the split core 30 is assembled to the stator coil 14, the split core 30 and the insulating member 44 interfere with each other, for example, the second insulating circumferential direction extension of the insulating member 44a of the split core 30a. It is possible to prevent the portion 56 from interfering with the radially outer surface of the yoke 16-1 of the split core 30b. Therefore, according to the present embodiment, it is possible to appropriately manufacture an insulating structure in which the insulating members 44 adjacent to each other in the circumferential direction are formed in the radially innermost portion of the slot 20 and overlap in the radial direction. .

  In the first embodiment, the first insulating circumferential direction extending portion 54 is replaced with the second insulating circumferential direction extending portion in the “first circumferential direction extending portion” recited in the claims. 56 corresponds to the “second circumferentially extending portion” described in the claims.

  By the way, in said 1st Example, it forms so that the 1st core circumferential direction extension part 40 and the 2nd core circumferential direction extension part 42 of the division | segmentation core 30 may have the mutually same circumferential width. However, the present invention is not limited to this, so that the first core circumferential extension 40 and the second core circumferential extension 42 have different circumferential widths. It may be formed.

  In this modification as well, the first insulating circumferentially extending portion 54 of the insulating member 44 is replaced with the circumferential end of the yoke 16-1 of the split core 30 (that is, the first core circumferentially extending portion 40). And the second insulating circumferentially extending portion 56 extends beyond the circumferential end of the yoke 16-1 of the split core 30 (that is, the second core circumferentially extending portion 42). Good.

  In the first embodiment, all the split cores 30 have the same shape, and are attached to the two split cores 30a and 30b adjacent in the circumferential direction at the radially innermost portion of the slot 20. A portion where the insulating members 44a and 44b are overlapped in the radial direction is formed. In this structure, the second insulating circumferentially extending portion 56 extending beyond the circumferential end of the yoke 16-1 of the split core 30 of the insulating member 44a is formed to extend linearly in the circumferential direction. Alternatively, as shown in FIG. 5, it may be formed so as to extend stepwise when viewed from the axial direction.

  Further, instead of having all the divided cores 30 have the same shape, the divided core 30a and the divided core 30b may have different shapes. Specifically, the radial position of the radially inner side surface of the second core circumferential extension 42 of the split core 30a and the diameter of the radially inner side surface of the first core circumferential extension 40 of the split core 30b. The direction positions may be different from each other. In the structure of this modified example, the first insulating circumferentially extending portion 54 extending to the circumferential end of the yoke 16-1 of the split core 30 of the insulating member 44b extends linearly toward one side in the circumferential direction. The second insulating circumferentially extending portion 56 extending beyond the circumferential end of the yoke 16-1 of the split core 30 of the insulating member 44a extends linearly toward the other side in the circumferential direction. What is necessary is just to form.

  In the first embodiment described above, all the insulating members 44 provided for each divided core 30 have the same shape. On the other hand, in the second embodiment of the present invention, the insulating member provided for each divided core 30 has two types of shapes.

  FIG. 9 shows a configuration diagram of the first insulating member provided in the insulating structure of the stator core 12 of the present embodiment. FIG. 10 shows a configuration diagram of the second insulating member provided in the insulating structure of the stator core 12 of the present embodiment. 9 and 10, the same components as those shown in FIG. 4 are given the same reference numerals, and descriptions thereof are omitted or simplified. 9A and 10A are views as viewed from the radially inner side, and FIGS. 9B and 10B are views as viewed from the radially outer side. FIG. ) And FIG. 10C are diagrams as viewed in the direction of arrow III in FIG. 9A, and FIGS. 9D and 10D are diagrams as viewed in the direction of arrow IV in FIG. 9 (E) and FIG. 10 (E) are views as viewed in the direction of arrow V in FIG. 9 (A), respectively.

  In the present embodiment, the stator 10 includes an insulating member 100 that ensures insulation between the stator core 12 and the stator coil 14. The insulating member 100 is provided for each of the split cores 30 included in the stator core 12, and the same number as the number of the split cores 30 is provided. As with the insulating member 44 of the first embodiment, the insulating member 100 is made of paper or resin (for example, a thermosetting resin or a thermoplastic resin). The insulating member 100 includes the split core 30 and the stator coil 14. A thin insulating layer is formed between them. The insulating member 100 is an insulator for ensuring the insulation of the split core 30 with respect to the stator coil 14 and has a shape for realizing such a function.

  The insulating member 100 is either the first insulating member 102 or the second insulating member 104 of different types. Each of the first and second insulating members 102 and 104 has a shape that matches the shape of the split core 30. Each of the first and second insulating members 102 and 104 has a slot portion 46 and a teeth portion 48 that are integrally formed.

  The slot portion 46 of the first insulating member 102 is surrounded from the connection portion (that is, the base side of the tooth 18) with the tooth portion 48 corresponding to each of the two teeth 18-1 and 18-2 included in the split core 30. It has the 1st and 2nd insulation circumferential direction extension part 106,108 extended toward the direction outer side. The slot portion 46 of the second insulating member 104 is connected to the tooth portion 48 corresponding to each of the two teeth 18-1 and 18-2 included in the split core 30 (that is, the root side of the tooth 18). The third and fourth insulating circumferentially extending portions 110 and 112 extending outward from the circumferential direction.

  In the first insulating member 102, the first insulating circumferentially extending portion 106 is connected to the tooth portion 48 corresponding to the tooth 18-1 on one circumferential side of the two teeth 18 included in the split core 30. It extends toward one side in the circumferential direction from the portion, and faces the slot surface 32 of the yoke 16-1 (that is, the first core circumferentially extending portion 40 of the split core 30) in the radial direction. The first insulating circumferentially extending portion 106 extends from the connecting portion with the tooth portion 48 corresponding to the tooth 18-1 toward the circumferential end of the yoke 16-1 of the split core 30 toward one side in the circumferential direction. .

  In the first insulating member 102, the second insulating circumferentially extending portion 108 is connected to the tooth portion 48 corresponding to the tooth 18-2 on the other circumferential side of the two teeth 18 included in the split core 30. It extends toward the other side in the circumferential direction from the portion and faces the slot surface 34 of the yoke 16-1 (that is, the second core circumferentially extending portion 42 of the split core 30) in the radial direction. The second insulating circumferentially extending portion 108 extends from the connecting portion with the tooth portion 48 corresponding to the tooth 18-2 toward the circumferential end of the yoke 16-1 of the split core 30 toward the other circumferential side. .

  In the second insulating member 104, the third insulating circumferentially extending portion 110 is connected to the tooth portion 48 corresponding to the tooth 18-1 on the circumferential side of the two teeth 18 included in the split core 30. It extends toward one side in the circumferential direction from the portion, and faces the slot surface 32 of the yoke 16-1 (that is, the first core circumferentially extending portion 40 of the split core 30) in the radial direction. The third insulating circumferentially extending portion 110 extends beyond the circumferential end of the yoke 16-1 of the split core 30 from the connecting portion with the tooth portion 48 corresponding to the tooth 18-1 toward one side in the circumferential direction. ing.

  In the second insulating member 104, the fourth insulating circumferentially extending portion 112 includes a tooth portion 48 corresponding to the tooth 18-2 on the other circumferential side of the two teeth 18 included in the split core 30. Extending from the connecting portion toward the other side in the circumferential direction and opposed to the slot surface 34 of the yoke 16-1 (that is, the second core circumferential extending portion 42 of the split core 30) in the radial direction. The fourth insulating circumferentially extending portion 112 extends beyond the circumferential end of the yoke 16-1 of the split core 30 from the connecting portion with the tooth portion 48 corresponding to the tooth 18-2 toward the other circumferential side. ing.

  That is, the first and second insulating circumferentially extending portions 106 and 108 of the first insulating member 102 are both connected to the tooth portion 48 corresponding to the tooth 18 from the first or second of the split core 30. The core circumferentially extending portions 40 and 42 extend outward in the circumferential direction to the same circumferential position with respect to the circumferential ends. Further, the third and fourth insulating circumferentially extending portions 110 and 112 of the second insulating member 104 are both connected to the tooth portion 48 corresponding to the tooth 18 from the first or second of the split core 30. The core circumferentially extending portions 40, 42 extend outward in the circumferential direction to a position on the outer side in the circumferential direction than the circumferential ends.

  In the first insulating member 102, the circumferential width of the first insulating circumferential extension 106 substantially matches the circumferential width of the first core circumferential extension 40 of the split core 30. At the same time, the circumferential width of the second insulating circumferentially extending portion 108 substantially matches the circumferential width of the second core circumferentially extending portion 42 of the split core 30. As described above, the first core circumferential extension 40 and the second core circumferential extension 42 of the split core 30 have substantially the same circumferential width. For this reason, the circumferential width of the first insulating circumferential extending portion 106 of the first insulating member 102 and the circumferential width of the second insulating circumferential extending portion 108 are substantially the same.

  Further, in the second insulating member 104, the circumferential width of the third insulating circumferentially extending portion 110 is larger than the circumferential width of the first core circumferentially extending portion 40 of the split core 30, In addition, the circumferential width of the fourth insulating circumferentially extending portion 112 is greater than the circumferential width of the second core circumferentially extending portion 42 of the split core 30. As described above, the first core circumferential extension 40 and the second core circumferential extension 42 of the split core 30 have substantially the same circumferential width. For this reason, the circumferential width of the third insulating circumferentially extending portion 110 of the second insulating member 104 and the circumferential width of the fourth insulating circumferentially extending portion 112 are substantially the same.

  In this embodiment, the first insulating member 102 and the second insulating member 104 are alternately arranged in the circumferential direction as the insulating member 100. In such a structure, when the divided cores 30 are assembled and arranged in the circumferential direction in a state where the first or second insulating members 102 and 104 are attached to the respective divided cores 30 constituting the stator core 12. Of all the slots 20 existing in the circumferential direction of the stator core 12, two circumferentially adjacent divided cores 30 bring the divided surfaces 36 into contact with each other at the radially innermost portion of the slots 20 facing in the circumferential direction. A portion where the first insulating member 102 and the second insulating member 104 attached to the two divided cores 30 adjacent to each other in the circumferential direction overlap in the radial direction is formed.

  That is, the insulating member 100 includes the first and second insulating circumferentially extending portions 106 and 108 of the first insulating member 102 and the third and fourth of the second insulating member 104 that are adjacent to each other in the circumferential direction. It arrange | positions so that the insulation circumferential direction extension parts 110 and 112 may overlap with radial direction. According to such an insulating structure, the creeping distance between the stator core 12 and the stator coil 14 can be increased by the overlap between the first insulating member 102 and the second insulating member 104. Therefore, according to the insulating structure of the stator core 12 of the present embodiment, of all the slots 20, the two adjacent cores 30 adjacent to each other in the circumferential direction have the diameters of the slots 20 facing each other in the circumferential direction by bringing the divided surfaces 36 into contact with each other. The insulation between the stator core 12 and the stator coil 14 in the vicinity of the innermost portion in the direction, that is, in the vicinity of the mating surface between the first insulating member 102 and the second insulating member 104 adjacent to each other in the circumferential direction. Can do.

  Hereinafter, with reference to FIGS. 11 to 13, a method of assembling the stator 10 according to the present embodiment, specifically, a method of assembling the stator core 12 to the stator coil 14 will be described.

  FIG. 11 shows a configuration diagram of the split core with an insulating member provided in the insulating structure of the stator core 12 of the present embodiment immediately before assembly to the stator coil 14. FIG. 12 shows a configuration diagram after assembling the first insulating member 102 included in the insulating structure of the stator core 12 of the present embodiment. FIG. 13 shows a configuration diagram after assembling the second insulating member 104 provided in the insulating structure of the stator core 12 of the present embodiment. 11A, 12A, and 13A are perspective views, and FIGS. 11B, 12B, and 13B are top views. Are shown respectively.

  In this embodiment, first, an annular coil assembly 60 in which a plurality of stator coils 14 are arranged in the circumferential direction is prepared. And after attaching the insulating member 100 (1st or 2nd insulating member 102,104) to each division | segmentation core 30 which comprises the stator core 12, all the division | segmentation cores 30 with which these insulation members 100 were equipped | attached are described above. It arrange | positions with respect to the coil assembly 60 of radial direction outer side (FIG. 11).

  Next, the first insulating circumferential direction extending portion 106 of the first insulating member 102 is adjacent to the divided core 30 and one side in the circumferential direction. The second insulating member 104 of the second insulating member 104 of the split core 30 that overlaps the fourth insulating circumferential direction extension portion 112 in the radial direction and the second insulating circumferential direction extension portion 108 of the first insulating member 102 is The second insulating member 104 of the divided core 30 adjacent to the divided core 30 on the other side in the circumferential direction overlaps the third insulating circumferential direction extending portion 110 in the radial direction, that is, the first insulating member 102 The coil assembly 60 is arranged so that the first and second insulating circumferentially extending portions 106 and 108 and the third and fourth insulating circumferentially extending portions 110 and 112 of the second insulating member 104 overlap in the radial direction. Assemble it.

  Specifically, the two divided cores 30 and the insulating member 100 that are adjacent to each other in the circumferential direction are connected to the third and fourth insulating circumferentially extending portions 110 on the divided core 30 side on which the second insulating member 104 is mounted. , 112 are located radially inward, and the first and second insulating circumferentially extending portions 106, 108 on the side of the split core 30 to which the first insulating member 102 is attached are located radially outward. Next, the coil assembly 60 is assembled. That is, the two divided cores 30 and the insulating member 100 that are adjacent to each other in the circumferential direction are divided into the third and fourth insulating circumferential direction extending portions 110 and 112 on the divided core 30 side where the second insulating member 104 is mounted. The radially inner side (radially far side) with respect to the slot surfaces 32 and 34 relative to the first and second insulating circumferentially extending portions 106 and 108 on the split core 30 side to which the first insulating member 102 is mounted. The coil assembly 60 is assembled so as to be positioned at

  In the above assembly, among all the divided cores 30 and all the insulating members 100 constituting the stator core 12, all the divided cores 30 to which the second insulating members 104 are attached are placed at desired positions with respect to the coil assembly 60. After the assembly, it is realized by assembling all the split cores 30 to which the first insulating member 102 is attached at a desired position with respect to the coil assembly 60.

  According to the above assembling method, the divided core 30 and the insulating member 100 interfere when the divided core 30 is assembled to the stator coil 14, for example, the third and fourth insulating circumferential directions of the second insulating member 104. It is possible to prevent the extending portions 110 and 112 from interfering with the radially outer side surface of the yoke 16-1 of the split core 30 to which the first insulating member 102 is attached. Therefore, according to the present embodiment, the insulating structure formed in the radially innermost portion of the slot 20 is such that the first insulating member 102 and the second insulating member 104 adjacent to each other in the circumferential direction overlap in the radial direction. Can be manufactured appropriately.

  In the second embodiment described above, the first and second insulating circumferentially extending portions 106 and 108 are described in the claims as “the first circumferential extending portion of the first insulating member”. The third and fourth insulating circumferentially extending portions 110 and 112 correspond to the “second circumferentially extending portion of the second insulating member” recited in the claims, respectively. .

  By the way, also in said 2nd Example, it forms so that the 1st core circumferential direction extension part 40 of the division | segmentation core 30 and the 2nd core circumferential direction extension part 42 may have the width | variety of the substantially same circumferential direction mutually. However, the present invention is not limited to this, so that the first core circumferential extension 40 and the second core circumferential extension 42 have different circumferential widths. It may be formed.

  In this modification as well, the first and second insulating circumferentially extending portions 106 and 108 of the first insulating member 102 are connected to the yoke 16-1 of the split core 30 (that is, the first core circumferentially extending). Portion 40) extends to the circumferential end, and the third and fourth insulating circumferentially extending portions 110, 112 of the second insulating member 104 are connected to the yoke 16-1 of the split core 30 (ie, the second core). What is necessary is just to extend beyond the circumferential direction end of the circumferential direction extension part 42).

  Further, in the second embodiment, all the split cores 30 have the same shape, and are attached to the two split cores 30 adjacent to each other in the circumferential direction at the radially innermost portion of the slot 20. A portion where the first and second insulating members 102 and 104 overlap in the radial direction is formed. In this structure, the third and fourth insulating circumferentially extending portions 110, 112 extending beyond the circumferential end of the yoke 16-1 of the split core 30 of the second insulating member 104 are directed toward the circumferential direction. It may be formed so as to extend linearly, or may be formed so as to extend stepwise when viewed from the axial direction.

  Further, instead of having all the divided cores 30 having the same shape, the divided core 30 to which the first insulating member 102 is attached and the divided core 30 to which the second insulating member 104 is attached are different from each other. It is good also as having. Specifically, the radial position of the radially inner side surfaces of the first and second core circumferentially extending portions 40 and 42 of the split core 30 to which the first insulating member 102 is attached, and the second insulating member The radial positions of the radially inner side surfaces of the first and second core circumferentially extending portions 40 and 42 of the split core 30 to which the 104 is attached may be different from each other. In the structure of this modified example, the first and second insulating circumferentially extending portions 106 and 108 of the first insulating member 102 are formed so as to extend linearly outward in the circumferential direction, The third and fourth insulating circumferentially extending portions 110 and 112 of the insulating member 104 may be formed so as to extend linearly outward in the circumferential direction.

  Moreover, in said 1st and 2nd Example, although the shape of the split core 30 contains the two teeth 18-1 and 18-2, this invention is not limited to this, The split core 30 As long as the shape includes at least one tooth 18, three or more teeth 18 may be included. Also in this modified example, the shape of the insulating members 44 and 100 is adapted to the shape of the split core 30.

  Further, the first and second embodiments described above are examples of an inner rotor type rotating electrical machine in which the stator 10 is disposed radially outward with respect to the rotor, but the stator 10 is radially inward with respect to the rotor. It is also possible to apply to an example of an outer rotor type rotating electrical machine arranged.

DESCRIPTION OF SYMBOLS 10 Stator 12 Stator core 14 Stator coil 16 Yoke 18 Teeth 20 Slot 30 Split core 32, 34 Slot surface 40 1st core circumferential direction extension part 42 2nd core circumferential direction extension part 44,100 Insulation member 46 Slot part 48 Teeth part 54, 56, 106-112 Insulation circumferential direction extension part 102 1st insulation member 104 2nd insulation member

Claims (11)

An insulating structure of a stator core divided into a plurality of divided cores in the circumferential direction, having a yoke formed in an annular shape and a plurality of teeth projecting radially from the yoke,
An insulating structure of a stator core, wherein a portion where an insulating member overlaps in a radial direction is provided at a radially innermost portion of a slot formed between two teeth adjacent in the circumferential direction.   2. The stator core insulation structure according to claim 1, wherein the insulation member is provided for each of the divided cores, and the insulation members adjacent in the circumferential direction overlap in a radial direction. Each of the insulating members is provided at a portion corresponding to the radially innermost portion of the slot, and a first circumferentially extending portion extending toward the circumferential end of the divided core toward one circumferential side. A second circumferentially extending portion extending beyond the circumferential end of the split core toward the other circumferential side, and
Each of the insulating members is such that the first circumferentially extending portion overlaps the second circumferentially extending portion of the insulating member adjacent to one side in the circumferential direction in the radial direction, and the second circumferential direction 3. The stator core insulation structure according to claim 2, wherein an extending portion is arranged so as to overlap in a radial direction with the first circumferential extending portion of the insulating member adjacent to the other circumferential side. The insulating member includes a first circumferentially extending portion that is provided at a portion corresponding to the radially innermost portion of the slot and extends to the circumferential end of the split core toward both circumferential sides. And a second circumferentially extending portion that extends beyond the circumferential end of the split core toward both sides in the circumferential direction, provided at a portion corresponding to the radially innermost portion of the slot. A second insulating member,
The first insulating member and the second insulating member are alternately arranged in the circumferential direction,
The insulating member is adjacent to each other in the circumferential direction, and the first circumferential extending portion of the first insulating member and the second circumferential extending portion of the second insulating member are in the radial direction. 3. The stator core insulation structure according to claim 2, wherein the stator core insulation structure is disposed so as to overlap.   The insulating members adjacent to each other in the circumferential direction are such that the second circumferentially extending portion of one of the insulating members is more radial in the slot than the first circumferentially extending portion of the other insulating member. 5. The stator core insulation structure according to claim 3, wherein the stator core is disposed so as to be located on a radially far side with respect to a core surface of the innermost portion of the stator.   6. The stator core insulating structure according to claim 1, wherein each of the divided cores has a shape including the two teeth. 7.   7. The stator core insulation structure according to claim 1, wherein the insulation member is a thin-film molded resin member. 8. A stator core having a yoke formed in an annular shape and a plurality of teeth projecting radially from the yoke and divided into a plurality of divided cores in the circumferential direction, and a stator coil provided for each of the divided cores An insulating member for ensuring insulation of the stator core with respect to the stator,
Each of the insulating members is provided at a portion corresponding to the innermost portion in the radial direction of a slot formed between the two teeth adjacent in the circumferential direction. A first circumferential extension extending to the circumferential end, and a second circumferential extension extending beyond the circumferential end of the split core toward the other circumferential side,
Each of the insulating members is such that the first circumferentially extending portion overlaps the second circumferentially extending portion of the insulating member adjacent to one side in the circumferential direction in the radial direction, and the second circumferential direction An extending portion is disposed so as to overlap with the first circumferential extending portion of the insulating member adjacent to the other circumferential side in the radial direction,
The insulating members adjacent to each other in the circumferential direction are arranged such that the second circumferentially extending portion of one of the insulating members has a radial direction of the slot more than the first circumferentially extending portion of the other insulating member. A stator assembling method, wherein the stator is assembled so as to be positioned on the far side in the radial direction with respect to the core surface of the innermost part.   The stator assembling method according to claim 8, wherein all the insulating members are assembled at the same time. A stator core having a yoke formed in an annular shape and a plurality of teeth projecting radially from the yoke and divided into a plurality of divided cores in the circumferential direction, and a stator coil provided for each of the divided cores An insulating member for ensuring insulation of the stator core with respect to the stator,
The insulating member is provided at a portion corresponding to a radially innermost portion of a slot formed between two teeth adjacent in the circumferential direction, and the circumferential end of the divided core toward each of both sides in the circumferential direction. A first insulating member having a first circumferentially extending portion extending up to a circumferential end of the divided core toward each of both circumferential sides provided at a portion corresponding to the radially innermost portion of the slot And a second insulating member having a second circumferentially extending portion extending beyond
The first insulating member and the second insulating member are alternately arranged in the circumferential direction,
The insulating member is adjacent to each other in the circumferential direction, and the first circumferential extending portion of the first insulating member and the second circumferential extending portion of the second insulating member are in the radial direction. Arranged so as to overlap,
The insulating members that are adjacent to each other in the circumferential direction are arranged such that the second circumferential extending portion of the second insulating member is closer to the slot than the first circumferential extending portion of the first insulating member. A method for assembling a stator, characterized in that the stator is assembled so as to be positioned on the far side in the radial direction with respect to the core surface at the innermost part in the radial direction. The method of assembling a stator according to claim 10, wherein the first insulating member is assembled after the second insulating member is assembled.

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