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:
Feb. 26, 2013
Filed:
Aug. 12, 2011
Wataru Kuroki, Minamitsuru-gun, JP;
Takashi Harada, Minamitsuru-gun, JP;
Shinichi Horikoshi, Minamitsuru-gun, JP;
Yasusuke Iwashita, Minamitsuru-gun, JP;
Wataru Kuroki, 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 comprises: an AC/DC converter which converts AC voltage supplied from an AC power source into DC voltage through PWM switching control of a power switching device; and a DC/AC converter which converts the DC voltage into variable-frequency AC voltage for driving a motor in a controlled manner. The AC/DC converter includes: a control unit which generates, based on an error between the DC voltage and a DC voltage command value, a PWM signal for the PWM switching control of the power switching device; and a frequency/gain varying unit which sets the frequency of the PWM signal to be generated by the control unit and a control gain in the control unit higher than their normal levels during a period in which a load in the DC/AC converter varies.