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EP-4738668-A1 - STATOR MANUFACTURING METHOD AND RESTRAINT JIG

EP4738668A1EP 4738668 A1EP4738668 A1EP 4738668A1EP-4738668-A1

Abstract

Provided is stator manufacturing method capable of suppressing twisting of projecting portions of segment coils along with circumferentially bending thereof. It positions a restraint jig 19 between axial base portions 11a of the projecting portions 11 adjacent to each other in a circumferential direction. The restraint jig 19 has grooves 25 corresponding to the base portions 11a adjacent in the circumferential direction. It relatively displaces coil ends 9a as tip ends of the projecting portions 11 with respect to the stator core 3 in the circumferential direction, to enter the base portions 11a of the projecting portions 11 into adjacent respective grooves 25 of the restraint jig 19 and bend the projecting portions 11 while the base portions are restrained in a radial direction of the stator core 3.

Inventors

  • KOBAYASHI DAI
  • OTSUKA MOTOYUKI

Assignees

  • NHK Spring Co., Ltd.

Dates

Publication Date
20260506
Application Date
20240617

Claims (7)

  1. A method of manufacturing a stator in which projecting portions of segment coils projecting in an axial direction from a stator core holding the segment coils are bent in a circumferential direction, comprising: positioning a restraint jig between axial base portions of the projecting portions adjacent to each other in the circumferential direction, the restraint jig having grooves corresponding to the base portions adjacent in the circumferential direction; and relatively displacing tip ends of the projecting portions with respect to the stator core in the circumferential direction, to enter the base portions of the projecting portions into adjacent respective grooves of the restraint jig and bend the projecting portions while the base portions are restrained in a radial direction of the stator core.
  2. The method of manufacturing a stator according to claim 1, wherein the restraint jig is configured by stacking a jig body having the grooves on a spacer movable in the radial direction, the spacer is removed outward in the radial direction after the projecting portions are bent, and the jig body is axially moved toward the stator core in a space caused by removal of the spacer to pull the base portions out from the grooves and then is removed outward in the radial direction.
  3. A restraint jig used when projecting portions of segment coils projecting in an axial direction from a stator core holding the segment coils are bent in a circumferential direction, comprising: a jig body positioned between axial base portions of the projecting portions adjacent to each other in the circumferential direction; and grooves provided on the jig body and corresponding to the base portions adjacent in the circumferential direction in a state that the jig body is positioned between the base portions, wherein the base portions of the projecting portions are entered into adjacent respective grooves to be restrained in a radial direction of the stator core when the projecting portions are bent.
  4. The restraint jig according to claim 3, further comprising: a spacer stacking the jig body thereon and being movable in the radial direction.
  5. The restraint jig according to claim 3 or 4, wherein the grooves are provided on respective sides of the jig body in the circumferential direction, and the grooves on one side in the circumferential direction is radially deviated with respect to the grooves on the other side in the circumferential direction.
  6. The restraint jig according to claim 5, wherein the grooves are inclined so that bottom faces thereof are gradually close to the stator core in the axial direction toward outer sides in the circumferential direction.
  7. The restraint jig according to claim 3 or 4, wherein the jig body has a fan shape in a plan view, an outer peripheral portion of which is in contact with another in the circumferential direction.

Description

FIELD OF THE INVENTION The present invention relates to a method of manufacturing a stator of a rotating electrical machine such as a motor or a generator, and a restraint jig used for this method. BACKGROUND OF THE INVENTION As a conventional method of manufacturing a stator, for example, as in Patent literature 1, there is one in which a plurality of segment coils are held in a stator core and projecting portions of the segment coils projecting from the stator core in the axial direction are bent in the circumferential direction. In this manufacturing method, a rod-shaped restricting member is positioned between projecting portions adjacent to each other in the circumferential direction, and bending of the projecting portions are performed along the restricting member. With this, the size of the bending of the projecting portions are controlled or restricted. In the conventional manufacturing method, twisting, however, may occur in the projecting portions of the segment coils along with the circumferentially bending thereof. CITATION LIST PATENT LITERATURE PATENT LITERATURE 1: JP2015-2632A SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION The problem to be solved is that twisting occurs in projecting portions of segment coils along with circumferentially bending thereof. MEANS FOR SOLVING THE PROBLEM The present invention provides a method of manufacturing a stator in which projecting portions of segment coils projecting in an axial direction from a stator core holding the segment coils are bent in a circumferential direction. This manufacturing method positions a restraint jig between axial base portions of the projecting portions adjacent to each other in the circumferential direction. The restraint jig has grooves corresponding to the base portions adjacent in the circumferential direction. Then, it relatively displaces tip ends of the projecting portions with respect to the stator core in the circumferential direction, to enter the base portions of the projecting portions into adjacent respective grooves of the restraint jig and bend the projecting portions while the base portions are restrained in a radial direction of the stator core. In addition, the present invention provides a restraint jig used when projecting portions of segment coils projecting in an axial direction from a stator core holding the segment coils are bent in a circumferential direction. The restraint jig includes a jig body positioned between axial base portions of the projecting portions adjacent to each other in the circumferential direction, and grooves provided on the jig body and corresponding to the base portions adjacent in the circumferential direction in a state that the jig body is positioned between the base portions. The base portions of the projecting portions are entered into adjacent respective grooves to be restrained in a radial direction of the stator core when the projecting portions are bent. EFFECT OF THE INVENTION According to the present invention, it is possible to suppress twisting of projecting portions of segment coils along with circumferentially bending thereof. BRIEF DESCRIPTION OF THE DRAWINGS [FIG. 1] FIG. 1 is a perspective view of a stator supported by a support jig according to an embodiment of the present invention.[FIG. 2] FIG. 2 is an enlarged perspective view illustrating part of FIG. 1.[FIG. 3] FIG. 3 is a perspective view illustrating a stator supported by a support jig before bending of projecting portions of segment coils.[FIG. 4] FIG. 4 is an enlarged perspective view illustrating part of FIG. 3.[FIG. 5] FIGS. 5(A) to (F) are sectional views illustrating a method of manufacturing a stator.[FIG. 6] FIG. 6 (A) is a sectional view illustrating a twisting device and restraint jigs according to the embodiment of the present invention, and FIG. 6 (B) is an enlarged view of part of FIG. 6 (A).[FIG. 7] FIG. 7 is a perspective view illustrating a stator core and the restraint jigs.[FIG. 8] FIG. 8 is an enlarged perspective view illustrating part of FIG. 7.[FIG. 9] FIG. 9 is a perspective view illustrating the restraint jig of FIG. 7.[FIG. 10] FIG. 10 is an exploded perspective view of the restraint jig of FIG. 9.[FIG. 11] FIG. 11 is a plan view of the restraint jig of FIG. 9.[FIG. 12] FIG. 12 is a front view of the restraint jig of FIG. 9 when viewed in a radial direction.[FIG. 13] FIG. 13 is a perspective view illustrating a twisting process.[FIG. 14] FIG. 14 is an enlarged sectional view of a groove and its periphery of FIG. 13. EMBODIMENT FOR CARRYING OUT THE INVENTION The object of suppressing twisting of projecting portions of segment coils along with circumferentially bending thereof is accomplished by a restraint jig capable of bending the projecting portions while restraining the projecting portions in a radial direction. A method of manufacturing a stator 1 manufactures a stator 1 in which projecting portions 11 of segment coils 9 projecting in an axial direction from a st