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:
Nov. 01, 2016
Filed:
Apr. 26, 2013
Minebea Co., Ltd., Kitasaku-gun, Nagano, JP;
Yuji Omura, Haibara-gun, JP;
Tomoaki Nakano, Fukuroi, JP;
Masaaki Nishizawa, Kitasaku-gun, JP;
Takahiro Sakaguchi, Kokubunji, JP;
Shinichi Uchikawa, Kitasaku-gun, JP;
Tomoyuki Tsukada, Kitasaku-gun, JP;
MINEBEA CO., LTD., Kitasaku, JP;
Abstract
A single-phase brushless motor has both superior start-up stability and low cogging torque. In the outer-rotor-type single-phase brushless motor, when a gap width between the rotor and one edge of the salient pole surface is defined as d, a gap width between the rotor and the other edge of the salient pole surface is defined as d, and a minimum gap width between the rotor and the salient pole surface is defined as d, the formula d<d<dis satisfied, and the gap width is dat a position shifted toward the one edge of the salient pole surface from the center of the arc shape which forms the salient pole surface.