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. 30, 2008
Filed:
Apr. 10, 2006
Yukihiro Katayama, Hitachi, JP;
Masashi Sugiyama, Hitachi, JP;
Shunya Morita, Hitachi, JP;
Hirohisa Satomi, Hitachi, JP;
Yukihiro Katayama, Hitachi, JP;
Masashi Sugiyama, Hitachi, JP;
Shunya Morita, Hitachi, JP;
Hirohisa Satomi, Hitachi, JP;
Hitachi-GE Nuclear Energy, Ltd., Ibaraki-ken, JP;
Abstract
An adjustable speed drive system for a primary loop recirculation pump capable of keeping a PLR pump operating even if a single malfunction occurred in a main adjustable speed drive circuit portion. The drive system for the primary loop recirculation pump has a backup main adjustable speed drive circuit portion, and a breaker for switching between an incoming destination and an outputting destination of the backup main adjustable speed drive circuit portion. A control signal of an inverter control portion is switched to control an inverter included in the backup main adjustable speed drive circuit portion, and when a malfunction occurred in the adjustable speed drive main circuit, by switching to the backup main adjustable speed drive circuit portion, the primary loop recirculation pump of a nuclear reactor is continuously controlled and operated.