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. 04, 2017
Filed:
Jan. 26, 2016
Fanuc Corporation, Yamanashi, JP;
Ryouta Yamaguchi, Yamanashi, JP;
Taku Sasaki, Yamanashi, JP;
FANUC CORPORATION, Yamanashi, JP;
Abstract
A motor drive device driving any of a feed shaft or spindle of a machine tool or arm of an industrial machine or industrial robot etc., comprising a current detecting part detecting a motor current, a current control part using an output from the current detecting part as the basis to output a command value to the motor, and a power converting part using a current command as the basis to supply power to the motor, the current detecting part comprising a current slope detecting part and a switching part using an output of the current slope detecting part to switch a plurality of filter characteristics to switch a mode of current detection. The switching part switches to a filter with a narrow/a broad bandwidth when the slope of the current is small/large to thereby improve the precision of current detection.