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. 31, 2017
Filed:
Sep. 01, 2015
Fanuc Corporation, Yamanashi, JP;
Wataru Kuroki, Yamanashi, JP;
Fanuc Corporation, Yamanashi, JP;
Abstract
An electric motor drive apparatus includes: an AC/DC converter converting AC into DC by the switching of multiple power devices; a control circuit performing PWM switching control of the multiple power devices; a current detecting circuit that detects input current from the AC power supply to the AC/DC converter; an electromagnetic contactor connecting or cutting off power from the AC power supply to the AC converter; and a DC link unit including a smoothing capacitor for smoothing DC voltage, and is constructed such that the control circuit determines that the electromagnetic contactor has been welded when input current is detected in a condition where with the DC link unit having been charged, the electromagnetic contactor is turned off to cut off the power from the AC power supply to the AC/DC converter and the multiple power devices are controlled by PWM switching in accordance with the switching commands.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile