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. 22, 2019
Filed:
Oct. 26, 2017
Fanuc Corporation, Minamitsuru-gun, Yamanashi, JP;
Yoshikiyo Tanabe, Yamanashi, JP;
Masaru Kino, Yamanashi, JP;
FANUC CORPORATION, Yamanashi, JP;
Abstract
A motor drive device includes: a converter which converts AC power of an AC power source side to DC power and outputs the same to a DC link; a DC link capacitor; an inverter in which each switching element is controlled based on a switching drive signal supplied, thereby performing power conversion between DC power of the DC link and AC power of a motor side; a DC/DC converter which converts DC power of the DC link to DC power for a control power source; a servo motor control circuit which outputs the switching drive signal; a torque cut-off circuit which cuts off source of each switching drive signal to each switching element, thereby stopping a motor when not receiving a safety signal; and a safety monitor circuit which stops transmission of the safety signal during an abnormality of the torque cut-off circuit.