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

United States Patent

February 26, 2013
View the Complete Patent at the US Patent & Trademark Office
A system and method for determining the stator winding resistance of AC motors is provided. The system includes an AC motor drive having an input connectable to an AC source and an output connectable to an input terminal of an AC motor, a pulse width modulation (PWM) converter having switches therein to control current flow and terminal voltages in the AC motor, and a control system connected to the PWM converter. The control system generates a command signal to cause the PWM converter to control an output of the AC motor drive corresponding to an input to the AC motor, selectively generates a modified command signal to cause the PWM converter to inject a DC signal into the output of the AC motor drive, and determines a stator winding resistance of the AC motor based on the DC signal of at least one of the voltage and current.
Lu; Bin (Kenosha, WI), Habetler; Thomas G. (Snellville, GA), Zhang; Pinjia (Atlanta, GA)
Eaton Corporation (Cleveland, OH)
12/ 363,413
January 30, 2009
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.