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:
Sep. 09, 2008
Filed:
Jan. 23, 2006
Keiichi Okai, Tokyo, JP;
Takeshi Tagashira, Tokyo, JP;
Ryoji Yanagi, Tokyo, JP;
Hiroshi Nomura, Tokyo, JP;
Keiichi Okai, Tokyo, JP;
Takeshi Tagashira, Tokyo, JP;
Ryoji Yanagi, Tokyo, JP;
Hiroshi Nomura, Tokyo, JP;
Japan Aerospace Exploration Agency, Tokyo, JP;
Nihon University, Tokyo, JP;
Abstract
In order to obtain an electromagnetic rotating machine of lightweight and high energy efficiency, which produces big torque for rotating a large-diameter fan, a coil A and coil B as excitation coils are disposed on an inner peripheral surface of a fan casing so as to face an outer circumference of the fan, and a coil M as an armature coil crosses at a central portion and is disposed on the outer circumference of the fan. The relationships |I|=|I| and I=−I, or |I|=|I| and I=−Iare obtained respectively for the coil A or coil B by a current control device (not shown). Moreover, the coil A and coil B are subjected to excitation control such that the direction of effective electromagnetic force, which is generated by an interaction between an effective magnetic field formed by the coil A and effective induced current applied to the coil M by the coil B, corresponds to the direction of rotation of the fan.