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. 14, 2012
Filed:
Oct. 07, 2009
Takashi Oyake, Hitachi, JP;
Yuuken Okano, Kitaibaraki, JP;
Yutaka Kimura, Hitachiomiya, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An excitation device supplies a three-phase AC excitation current to a variable speed generator-motor, and controls the variable speed generator-motor based on a three-phase AC excitation current command value obtained by vector-synthesizing, based on a slip phase from an exciting phase detector, a torque direction excitation current command value from a power adjustment computing device, and a magnetic flux direction excitation current command value from a voltage adjustment computing device by an excitation current adjustment computing device. The variable speed generator-motor includes a power fluctuation suppression circuit that causes the torque direction excitation current command value fixed to a value before switching to follow a torque direction excitation current command target value calculated from an effective power by a predetermined conversion circuit, filter circuit, and limiter circuit during a synchronous operation in an operation control method for operating to switch a variable speed operation method and a synchronous operation method.