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:
Sep. 16, 1997
Filed:
Feb. 15, 1995
Yoshisuke Ueda, Shiga, JP;
Fuyuto Takase, Kyoto, JP;
Kiyoshi Oku, Osaka, JP;
Takayuki Hira, Kanagawa, JP;
Atsushi Ashizawa, Kanagawa, JP;
Kansai Electric Power Co., Inc., Osaka, JP;
Fuji Electric Co., Kawasaki, JP;
Abstract
A synchronous machine effectively absorbs higher harmonics in an AC system to which the synchronous machine is linked. The synchronous machine includes a damper winding, disposed on each magnetic pole and constituting by itself an independent closed circuit; capacitors, each of which is connected in parallel with each of several damper winding divisions obtained by dividing the damper winding at predetermined winding turns; a DC reactor for blocking flowing-in of higher harmonics to a DC power supply for DC excitation; a series resonant circuit further including the damper winding and the capacitors; and a series resonant circuit including the field winding and capacitors. Resonant frequencies of both series resonant circuits are set at 6 nf (n: an integer, f: a fundamental frequency) so as to greatly reduce impedance of the damper winding and the field circuit seen from an armature of the synchronous machine, by which to extinguish or reduce higher harmonics (6n.+-.1)f of the AC system.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile