Heating circuit for an electric motor

Details Heating circuit for an electric motor Heating circuit for an electric motor

H - Electricity

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H05B 3/02 (2006.01) G05D 23/275 (2006.01) H02K 7/00 (2006.01) H02K 15/12 (2006.01)

Patent

CA 1123937

HEATING CIRCUIT FOR AN ELECTRIC MOTOR Abstract of the Disclosure An SCR is connected across one of three line contacts which couple the power lines to the windings of an a.c. motor. When the line contacts are opened to shut down the motor, heating current is applied to one of the motor windings through the SCR to raise its temperature above the ambient dew point. The SCR is fired every cycle of the line current and the firing angle is controlled in response to a command signal to provide the proper amount of heating current in the motor winding. The command signal is generated by summing a preselected reference signal with a negative feedback signal which is indicative of the amount of motor heating.

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