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:
Dec. 04, 2007
Filed:
Dec. 25, 2003
Applicants:
Junkoo Kang, Fukuoka, JP;
Saemitsu Hayashi, Fukuoka, JP;
Shinya Morimoto, Fukuoka, JP;
Inventors:
Assignee:
Kabushiki Kaisha Yasakawa Denki, Fukuoka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 9/00 (2006.01); H02P 9/10 (2006.01); H02P 9/14 (2006.01); F03D 7/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A power controllercalculates the induced voltage or rotor magnetic flux from the output voltage and the output current of a generator, estimates a shaft speed of the generatorfrom the phase of the induced voltage or the phase of the rotor magnetic flux, and calculate the output of a windmillfrom the estimated value of the shaft speed and the output of the generator. As a result, since the output of the windmillcan be calculated without requiring a speed sensor for detecting the shaft speed of the generator, it is possible to accomplish simplification of circuits, reduction of cost, and high reliability.