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:
Jan. 07, 2014
Filed:
Mar. 21, 2011
Tomokazu Yoshida, Minamitsuru-gun, JP;
Takashi Harada, Minamitsuru-gun, JP;
Shinichi Horikoshi, Minamitsuru-gun, JP;
Yasusuke Iwashita, Minamitsuru-gun, JP;
Tomokazu Yoshida, Minamitsuru-gun, JP;
Takashi Harada, Minamitsuru-gun, JP;
Shinichi Horikoshi, Minamitsuru-gun, JP;
Yasusuke Iwashita, Minamitsuru-gun, JP;
FANUC Corporation, Minamitsuru-gun, Yamanashi, JP;
Abstract
A motor driving apparatus is provided that performs AC/DC conversion by suppressing harmonics of the input at the time of normal operation, while on the other hand, allowing system operation to continue in the event of an overload by avoiding system stoppage. The motor driving apparatus, which drives a motor by supplying power from an AC power supply, includes: an AC/DC converter having a converter operation mode which is switched between a PWM converter operation mode in which an AC input voltage is converted into a DC voltage by applying PWM control to a plurality of power switching devices connected in serial and parallel fashion and a diode rectifier operation mode in which an AC input voltage is converted into a DC voltage by using a plurality of diodes each connected in reverse parallel with an associated one of the plurality of power switching devices; and a converter control unit which dynamically switches the converter operation mode of the AC/DC converter according to a load during powering of the motor.