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:
Jul. 21, 2009
Filed:
Oct. 17, 2007
Tomonaga Yamamoto, Fujiyoshida, JP;
Takuya Maeda, Yamanashi, JP;
Tomonaga Yamamoto, Fujiyoshida, JP;
Takuya Maeda, Yamanashi, JP;
Fanuc Ltd, Yamanashi, JP;
Abstract
An apparatus for manufacturing an electric motor having a laminated core structure formed by a plurality of core plates made of rolled material of electromagnetic sheet steel. The core plates are manufactured by punching rolled electromagnetic sheet steel in a die set. The rolled electromagnetic sheet steel is displaced angularly relative to the die set. The core plates have rolling directions of the electromagnetic sheet steel angularly displaced by a machine angle determined in accordance with the number of slots or poles provided in the laminated core structure so that a phase difference of cogging torques produced by magnetic anisotropy of the core plates is substantially 180°.