Means for limiting power dissipated in an a.c. motor

Details Means for limiting power dissipated in an a.c. motor Means for limiting power dissipated in an a.c. motor

H - Electricity

02

P

318/108

H02P 5/00 (2006.01) H02P 6/12 (2006.01)

Patent

CA 1167913

Abstract An A.C. motor is connected into a transistor bridge which includes a small current sensing resistor. The bridge is operated to supply alternating half cycles of current to the motor and resistor. The voltage drop across the resistor is compared in a comparator with a reference voltage which is equal to a fixed voltage minus a percentage of the bridge D.C. supply voltage. When the voltage drop across the resistor exceeds the reference voltage a gate means is closed to render the bridge transistors non-conductive.

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