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

1980-10-08

1982-04-13

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

363 98, H02H 708, H02P 1320

Patent

active

043250955

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.

REFERENCES:
patent: 4071812 (1978-01-01), Walker
patent: 4159515 (1979-06-01), Walkowiak

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