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:
Aug. 22, 2006
Filed:
Aug. 20, 2004
Mamoru Kimura, Chiyoda-ku, JP;
Motoo Futami, Chiyoda-ku, JP;
Masaya Ichinose, Chiyoda-ku, JP;
Kazumasa Ide, Chiyoda-ku, JP;
Kazuhiro Imaie, Chiyoda-ku, JP;
Mamoru Kimura, Chiyoda-ku, JP;
Motoo Futami, Chiyoda-ku, JP;
Masaya Ichinose, Chiyoda-ku, JP;
Kazumasa Ide, Chiyoda-ku, JP;
Kazuhiro Imaie, Chiyoda-ku, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Because of the necessity of resolver for detecting a rotating position, which is very expensive, and noise suppression of the rotating position signal line on a doubly-fed machine, cost increase of the generator and reduced reliability due to possible failures are inevitable. In order to solve such problem, a generation system in the present invention is equipped with an exciter that estimates the slip frequency of the doubly-fed machine from each primary current Iand voltage Vand secondary current Iand voltage Vof the doubly-fed machine and excites the secondary of the doubly-fed machine at the estimated slip frequency.