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:
Oct. 16, 2012
Filed:
Jul. 28, 2010
Takeshi Matsuno, Shizuoka, JP;
Yoshiya Yamamura, Shizuoka, JP;
Hiroaki Itahashi, Shizuoka, JP;
Shigeki Miyaji, Shizuoka, JP;
Yukihiro Terada, Shizuoka, JP;
Takeshi Matsuno, Shizuoka, JP;
Yoshiya Yamamura, Shizuoka, JP;
Hiroaki Itahashi, Shizuoka, JP;
Shigeki Miyaji, Shizuoka, JP;
Yukihiro Terada, Shizuoka, JP;
Minebea Co., Ltd., Nagano, JP;
Abstract
A stepping motor includes a rotor assembly and a stator assembly including two stator units axially coupled to each other. The two stator units each include a pair of yokes which each include a base portion and a plurality of pole teeth extending from the base portion and which are disposed such that each of the pole teeth of one yoke and each of the pole teeth of the other yoke are arranged alternately in the circumferential direction. The pole teeth are shaped symmetric and each include a pair of slant sides inclined so as to become closer to each other with an increase of distance from the base portion, and the slant sides of adjacent pole teeth are located close to each other wherein a magnetic pole gap between the adjacent pole teeth pole teeth is about 0.2 times as large as the thickness of the pole teeth.