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System and method to determine electric motor efficiency using an equivalent circuit

United States Patent

June 7, 2011
View the Complete Patent at the US Patent & Trademark Office
A system and method for determining electric motor efficiency includes a monitoring system having a processor programmed to determine efficiency of an electric motor under load while the electric motor is online. The determination of motor efficiency is independent of a rotor speed measurement. Further, the efficiency is based on a determination of stator winding resistance, an input voltage, and an input current. The determination of the stator winding resistance occurs while the electric motor under load is online.
Lu; Bin (Kenosha, WI), Habetler; Thomas G. (Snellville, GA)
Eaton Corporation (Cleveland, OH)
12/ 132,194
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.