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:
Oct. 02, 2018
Filed:
Oct. 07, 2016
Yaskawa America, Inc., Waukegan, IL (US);
Mahesh M. Swamy, Gurnee, IL (US);
Mark Baumgardner, New Berlin, WI (US);
Steven Hartig, Milwaukee, WI (US);
Daniel Nitzsche, Oconomowoc, WI (US);
Yaskawa America, Inc., Waukegan, IL (US);
Abstract
A motor drive system output filter includes fault detection. A variable frequency drive (VFD) drives a three phase AC induction motor. A filter circuit is connected between the VFD and the AC induction motor. The filter circuit comprises a filter for each phase. Each filter comprises an inductor and a damping resistor connected in series with a blocking capacitor across the inductor. A plurality of detection circuits are provided, one for each phase. Each detection circuit is connected to the capacitor of the associated phase for detecting capacitor voltage to indicate a resistor fault condition.