Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1978-05-30
1980-04-01
Salce, Partick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361 29, 361 86, 318782, 318430, 318445, H02H 709
Patent
active
041964624
ABSTRACT:
A solid state electronic circuit for protecting a single phase induction motor against excessive loading by comparing motor start winding voltage with motor source voltage is disclosed, wherein the circuit automatically removes the motor from its driving source upon the occurrence of such excessive loading. An additional feature includes comparing start winding voltage with source voltage to remove the motor from its driving source upon the occurrence of excessive start winding voltage and corresponding excessive high motor speed. A motor starting circuit to permit the start winding voltage to rise to its normal running level and a time delay restarting circuit to permit the motor to automatically restart after elapse of a selected lock out period following removal of the motor from the source due to insufficient or excessive loading is also provided.
REFERENCES:
patent: 2251891 (1941-08-01), Newton
patent: 3413520 (1968-11-01), Westbrook
patent: 3633073 (1972-01-01), Day et al.
patent: 3663958 (1972-05-01), Crane
patent: 3671830 (1972-06-01), Kruper
patent: 3784846 (1974-01-01), Krick et al.
patent: 3796918 (1974-03-01), DeForest et al.
patent: 3950675 (1976-04-01), Weber et al.
patent: 4040117 (1977-08-01), Houser
General Electric Company
Giacalone Frank P.
Reams Radford M.
Salce Partick R.
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