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:
Apr. 22, 2003
Filed:
Mar. 02, 2000
Akihiko Ikegami, Suwa, JP;
Yoshikazu Koike, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A stepping motor ( ) which has rotor pole teeth ( ) disposed with a predetermined pitch (P ) on a rotor ( ) and stator pole teeth ( ) formed on a stator pole ( ) so to oppose the rotor pole teeth ( ), wherein the stator poles ( ) are provided with n sets of tooth groups ( ) consisting of the stator pole teeth ( ) in the number of m, a pitch P of the stator pole teeth ( ) in the tooth groups ( ) is in the relation P ≠P , and a pitch P of the tooth groups ( ) is in the relations P ≠m·P and P ≠m·P (where, P , P and P denote an electrical angle, and m and n are integers of 2 or more), and a three-phase stepping motor in which the fourth harmonic and the sixth harmonic are decreased.