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:
Nov. 26, 2013
Filed:
Nov. 10, 2010
Zoran V. Vrankovic, Greenfield, WI (US);
Lixiang Wei, Whitefish Bay, WI (US);
Gary L. Skibinski, Milwaukee, WI (US);
Craig R. Winterhalter, Cedarburg, WI (US);
Zoran V. Vrankovic, Greenfield, WI (US);
Lixiang Wei, Whitefish Bay, WI (US);
Gary L. Skibinski, Milwaukee, WI (US);
Craig R. Winterhalter, Cedarburg, WI (US);
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Abstract
A motor drive system provides for analysis of current flow in the DC bus to identify ground faults and their locations. Low-frequency positive polarity and negative polarity current differences indicate ground faults from the positive DC bus and negative DC bus respectively. High-frequency signals indicate ground faults in the motor windings and connecting leads.