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. 19, 2008
Filed:
Apr. 28, 2006
Masaya Ichinose, Hitachiota, JP;
Motoo Futami, Hitachiota, JP;
Shinya Oohara, Hitachi, JP;
Kazuhiro Imaie, Hitachi, JP;
Mitsugu Matsutake, Hitachi, JP;
Masaya Ichinose, Hitachiota, JP;
Motoo Futami, Hitachiota, JP;
Shinya Oohara, Hitachi, JP;
Kazuhiro Imaie, Hitachi, JP;
Mitsugu Matsutake, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a power generation apparatus equipped with an AC energization synchronous generator, when energization of a secondary winding starts to conduct connecting to the network of the AC energization synchronous generator to a network voltage, energization of the secondary winding starts at a fixed frequency and a slip frequency is calculated from a difference between a frequency of the network voltage and a resultant stator voltage frequency. Thereafter, energization starts at the calculated slip frequency and a voltage having a frequency generally coincident with the network frequency is output to the stator to incorporate the generator to the network. A phase is adjusted to make zero a phase difference when the rotation speed changes or the phases become different.