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. 15, 2013
Filed:
Jun. 18, 2009
Chia-chou Yeh, Lomita, CA (US);
Steven E. Schulz, Torrance, CA (US);
Mohammad N. Anwar, Van Buren Township, MI (US);
Chia-Chou Yeh, Lomita, CA (US);
Steven E. Schulz, Torrance, CA (US);
Mohammad N. Anwar, Van Buren Township, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
Systems and methods are provided for diagnosing stator windings in an electric motor operating under control of a current-regulating control loop. The current-regulating control loop is configured to provide a command voltage to the electric motor. The command voltage comprises a current-regulated voltage based on a difference between a commanded current and a measured current through the stator windings. The method comprises determining a negative sequence component of the command voltage, and identifying a fault condition when a characteristic of the negative sequence component is greater than a threshold value.