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. 03, 2015
Filed:
Dec. 20, 2012
Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka-Ken, JP;
Tsukasa Shimizu, Shizuoka-ken, JP;
Haruyoshi Hino, Shizuoka-ken, JP;
Yamaha Hatsudoki Kabushiki Kaisha, Iwata-shi, JP;
Abstract
A tooth portion of a stator is divided into first and second tooth portions and in a relatively movable manner between a first position in which a magnetic resistance between the tooth portions is small and a second position in which the magnetic resistance is relatively larger than in the first position. When the second tooth portion is in the first position, the following equation is satisfied: (total magnetic resistance of main magnetic circuit C)<(total magnetic resistance of magnetic short-circuit C)≦(total magnetic resistance of magnetic circuit between permanent magnets C). When the second tooth portion is in the second position, it is satisfied: (total magnetic resistance of the magnetic short-circuit C)<(total magnetic resistance of the main magnetic circuit C), and (total magnetic resistance of the magnetic short-circuit C)≦(total magnetic resistance of the magnetic circuit between permanent magnetics C).