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:
Oct. 23, 1990
Filed:
Jun. 13, 1989
Applicant:
Inventors:
Tsutomu Maruyama, Tokyo, JP;
Koichi Kobayashi, Tokyo, JP;
Assignee:
Sanyo Denki Co., Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
307 87 ; 318102 ; 322 16 ; 307 84 ;
Abstract
A flat frequency, constant voltage power source device is provided for parallel operation of a plurality of electric generators. The generators include exciting windings of induction motors integral with the generators for connecting and disconnecting outputs of the generators. A starting sequence of the electric generators is based on a start signal provided externally and start preparation completion signals indicating completion of start preparation routines. The induction motors of the generators are thereby varied in frequency so that the generators can be synchronized in phase for their effective parallel operation.