The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 2010
Filed:
Apr. 15, 2004
Masaru Kawai, Mito, JP;
Kouji Harada, Hitachinaka, JP;
Masayuki Kobayashi, Tomobe, JP;
Shinji Yamazaki, Hitachinaka, JP;
Masaru Kawai, Mito, JP;
Kouji Harada, Hitachinaka, JP;
Masayuki Kobayashi, Tomobe, JP;
Shinji Yamazaki, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In order to realize a method of forming a rotor core that improves the productivity and enhances the product accuracy, a forming method of a rotor that is equipped with both permanent-magnet fastener on the inner perimetric end of the magnetic pole claw of the rotor core and tapered surface on the outer perimetric end on one end of the magnetic pole claw in the circumferential direction. By constraining the inner perimetric surface of the magnetic pole claw by a die and applying a forming pressure in the radial direction, the tapered surface on the outer perimetric end of the magnetic pole claw and permanent-magnet fastener on the inner perimetric end can be formed at the same time and a rotor core with high product accuracy and mass-productivity is realized.