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. 21, 2014
Filed:
Jun. 02, 2011
Applicants:
Lei Hao, Troy, MI (US);
Yilu Zhang, Northville, MI (US);
Siwei Cheng, Atlanta, GA (US);
Inventors:
Assignee:
GM Global Technology Operations LLC, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 7/00 (2006.01); H02P 29/02 (2006.01); H02P 29/00 (2006.01); G01K 7/22 (2006.01); G01R 31/34 (2006.01);
U.S. Cl.
CPC ...
H02P 29/0055 (2013.01); G01K 2205/00 (2013.01); H02P 29/028 (2013.01); G01K 7/22 (2013.01); G01R 31/343 (2013.01); G01K 2217/00 (2013.01);
Abstract
A method for determining a temperature of an electric motor including stator windings includes injecting an AC current into a D-axis current of a stator winding at a frequency that is synchronized with a control frequency of the electric motor, determining a DC-phase current, determining a resistance of the stator winding corresponding to the DC-phase current and an applied voltage, and determining a temperature of the electric motor as a function of the resistance of the stator winding.