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System and method for monitoring and controlling stator winding temperature in a de-energized AC motor

United States Patent

December 27, 2011
View the Complete Patent at the US Patent & Trademark Office
A system and method for measuring and controlling stator winding temperature in an AC motor while idling is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of a multi-phase AC motor. The circuit further includes a plurality of switching devices to control current flow and terminal voltages in the multi-phase AC motor and a controller connected to the circuit. The controller is configured to activate the plurality of switching devices to create a DC signal in an output of the motor control device corresponding to an input to the multi-phase AC motor, determine or estimate a stator winding resistance of the multi-phase AC motor based on the DC signal, and estimate a stator temperature from the stator winding resistance. Temperature can then be controlled and regulated by DC injection into the stator windings.
Lu; Bin (Kenosha, WI), Luebke; Charles John (Sussex, WI), Habetler; Thomas G. (Snellville, GA), Zhang; Pinjia (Atlanta, GA), Becker; Scott K. (Oak Creek, WI)
Eaton Corporation (Cleveland, OH)
12/ 341,044
December 22, 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.