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:
Feb. 20, 2001
Filed:
Jan. 26, 2000
Tsunao Yura, Tokyo, JP;
Akira Koike, Tokyo, JP;
Sanyo Denki Co., Ltd., Tokyo, JP;
Abstract
A permanent magnet type stepping motor capable of exhibiting increased rotational angle accuracy and static angle accuracy. Claw pole type yoke units each include two yokes each provided with n (n: a positive integer of 4 or more) pole teeth. One of the yokes includes n/m pole teeth arranged in each of angular ranges of 360° /m (m: a divisor of n other than 1 and n). Pitches a between pole teeth positioned in each angular range are set to be within a range of (90° /n) [4−m/(n−m)] <a<(360° /n). A pitch b between two pole teeth positioned on both side of a boundary between each adjacent two angular ranges is set to be within a range of (360° /n)<b<(450° /n). The other yoke has pole teeth arranged between the pole teeth of the one yoke.