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:
Jul. 24, 2012
Filed:
Mar. 16, 2004
Koji Hamaoka, Osaka, JP;
Hidetoshi Nishihara, Fujisawa, JP;
Katsumi Endo, Fujisawa, JP;
Makoto Katayama, Chigasaki, JP;
Shuichi Yakushi, Yokohama, JP;
Tatsuyuki Iizuka, Chigasaki, JP;
Yuji Saiki, Yokohama, JP;
Hidehisa Tanaka, Ritto, JP;
Tomonori Ouchiyama, Kusatsu, JP;
Koji Hamaoka, Osaka, JP;
Hidetoshi Nishihara, Fujisawa, JP;
Katsumi Endo, Fujisawa, JP;
Makoto Katayama, Chigasaki, JP;
Shuichi Yakushi, Yokohama, JP;
Tatsuyuki Iizuka, Chigasaki, JP;
Yuji Saiki, Yokohama, JP;
Hidehisa Tanaka, Ritto, JP;
Tomonori Ouchiyama, Kusatsu, JP;
Panasonic Corporation, , JP;
Abstract
A compressor includes a motor driven by a controller and having a rotor and a stator, a compressing unit driven by the motor in a hermetic container in which refrigerant is filled. Driving the motor at a low rpm, the controller practices a feedback control which determines a timing of turning on/off switching elements based on a signal detecting a position of the rotor, and when the motor is driven at a high rpm, the controller practices an open-loop control which outputs a given frequency and drives the motor synchronizing with the given frequency. This structure achieves a compressor working with a fewer noises in PWM driving.