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System and method to determine electric motor efficiency nonintrusively

United States Patent

8,010,318
August 30, 2011
View the Complete Patent at the US Patent & Trademark Office
A system and method for nonintrusively determining electric motor efficiency includes a processor programed to, while the motor is in operation, determine a plurality of stator input currents, electrical input data, a rotor speed, a value of stator resistance, and an efficiency of the motor based on the determined rotor speed, the value of stator resistance, the plurality of stator input currents, and the electrical input data. The determination of the rotor speed is based on one of the input power and the plurality of stator input currents. The determination of the value of the stator resistance is based on at least one of a horsepower rating and a combination of the plurality of stator input currents and the electrical input data. The electrical input data includes at least one of an input power and a plurality of stator input voltages.
Lu; Bin (Kenosha, WI), Habetler; Thomas G. (Snellville, GA), Harley; Ronald G. (Lawrenceville, GA)
Eaton Corporation (Cleveland, OH)
12/ 132,151
20080300827
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.