Invention Grant
- Patent Title: Rotor manufacturing method
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Application No.: US17421537Application Date: 2020-01-14
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Publication No.: US12074486B2Publication Date: 2024-08-27
- Inventor: Yohei Kameda , Yu Yoda
- Applicant: NHK SPRING CO., LTD.
- Applicant Address: JP Yokohama
- Assignee: NHK SPRING CO., LTD.
- Current Assignee: NHK SPRING CO., LTD.
- Current Assignee Address: JP Yokohama
- Agency: Dority & Manning, P.A.
- Priority: JP 19003620 2019.01.11
- International Application: PCT/JP2020/000849 2020.01.14
- International Announcement: WO2020/145410A 2020.07.16
- Date entered country: 2021-07-08
- Main IPC: H02K15/12
- IPC: H02K15/12 ; H02K15/03 ; H02K1/276

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. 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. Next, in a fourth process, the post-third process rotor core is cooled.
Public/Granted literature
- US20220103029A1 Rotor Manufacturing Method and Rotor Public/Granted day:2022-03-31
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