公开(公告)号：US20220103029A1

公开(公告)日：2022-03-31

申请号：US17421537

申请日：2020-01-14

Applicant: NHK SPRING CO., LTD.

Inventor： Yohei KAMEDA ,  Yu YODA

IPC: H02K1/276 ,  H02K15/03 ,  H02K15/12

Abstract: A rotor includes a rotor core configured by laminated steel plates and a magnet insertion hole extending along an axial direction of the rotor core, with a resin interposed between a permanent magnet placed in the magnet insertion hole and an inner wall face of the magnet insertion hole. In a manufacturing method for this rotor, in a first process, the permanent magnet and the resin are integrated together to manufacture a resin-coated permanent magnet that is capable of being press-fitted into the magnet insertion hole. Next, in a second process, the resin-coated permanent magnet is press-fitted into the magnet insertion hole. Next, in a third process, the post-second-process rotor core is heated to a temperature that is at least the temperature at which the resin softens. Accordingly, the softened resin is pressed in a rotor radial direction against the inner wall face of the magnet insertion hole and deformed so as to be fitted closely against undulations of the inner wall face of the magnet insertion hole. Next, in a fourth process, the post-third process rotor core is cooled.

公开(公告)号：US20250167642A1

公开(公告)日：2025-05-22

申请号：US18841146

申请日：2022-12-08

Applicant: NHK SPRING CO., LTD.

Inventor： Yohei KAMEDA ,  Yu YODA

IPC: H02K15/025 ,  H02K1/16 ,  H02K3/34 ,  H02K29/03

Abstract: An apparatus for manufacturing a stator that includes a stator core, in which a plurality of core pieces formed of electrical steel sheets are stacked, and coils inserted into slots of the stator core. The apparatus for manufacturing a stator includes a pair of coil holding jigs and an activation mechanism. The coil holding jigs hold, of the coils disposed in the slots, coil ends projecting from both of axial direction end portions of the stator core. The activation mechanism rotates at least one of the pair of coil holding jigs holding the coil ends in a circumferential direction of the stator, in order to form skew in the stator.