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System and method for determining stator winding resistance in an AC motor

United States Patent

7,952,318
May 31, 2011
View the Complete Patent at the US Patent & Trademark Office
A system and method for determining stator winding resistance in an AC motor is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of an AC motor. The circuit includes at least one contactor and at least one switch to control current flow and terminal voltages in the AC motor. The system also includes a controller connected to the circuit and configured to modify a switching time of the at least one switch to create a DC component in an output of the system corresponding to an input to the AC motor and determine a stator winding resistance of the AC motor based on the injected DC component of the voltage and current.
Lu; Bin (Kenosha, WI), Habetler; Thomas G. (Snellville, GA), Zhang; Pinjia (Atlanta, GA), Theisen; Peter J. (West Bend, WI)
Eaton Corporation (Cleveland, OH)
12/ 132,484
20090051311
June 3, 2008
GOVERNMENT LICENSE RIGHTS The present invention was made at least in part with Government support under Contract No. DE-FC36-04GO14000, awarded by the United States Department of Energy. The Government may have certain rights in the invention.