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. 24, 2009
Filed:
Jan. 19, 2007
Tomoyoshi Yokota, Hitachinaka, JP;
Shinichi Sakamoto, Hitachinaka, JP;
Chikai Yoshimizu, Hitachinaka, JP;
Katsuhiro Oomori, Hitachinaka, JP;
Tadayoshi Mineta, Yamagata-ken, JP;
Kenichi Kato, Yamagata, JP;
Tomoyoshi Yokota, Hitachinaka, JP;
Shinichi Sakamoto, Hitachinaka, JP;
Chikai Yoshimizu, Hitachinaka, JP;
Katsuhiro Oomori, Hitachinaka, JP;
Tadayoshi Mineta, Yamagata-ken, JP;
Kenichi Kato, Yamagata, JP;
Hitachi Koki Co., Ltd., , JP;
Abstract
A commutator motor includes a stator and a rotor, and the stator includes a stator yoke and a field magnet. The field magnet is fixed onto the inner peripheral surface of the substantially cylindrical stator yoke. The stator yoke is configured by coaxially stacking a plurality of plate-like annular bodies, and the annular bodies are fixedly connected to each other by caulking at a caulking portion disposed on the annular body. In manufacture, the length of the stator yoke in the axial direction can be arbitrarily changed with the thickness of the annular body in the axial direction as a minimum unit. In case of manufacturing various stator yokes that are different in the axial length, the necessity of replacing a manufacturing machine is eliminated, thereby providing a commutator motor having the stator yoke which is low in the manufacturing costs.