Magnetically latching and current sensitive automatically...

Details Magnetically latching and current sensitive automatically... Magnetically latching and current sensitive automatically...

H - Electricity

01

H

306/74

H01H 3/50 (2006.01) H01H 50/32 (2006.01) H01H 71/26 (2006.01)

Patent

CA 1264175

MAGNETICALLY LATCHING AND CURRENT SENSITIVE AUTOMATICALLY UNLATCHING SWITCH ASSEMBLY ABSTRACT A magnetically latching switch assembly adapted for use with a motor including first and second serially connected coils wound around a frame to generate oppo- sitely directed magnetic flux through the frame. The coils are arranged so that for the normal run current of the motor, the net magnetic flux is sufficient to mag- netically latch the switch against the restoring force of a spring. When the motor is stalled, the increased current is sensed and a portion of the current is di- verted from one of the coils to reduce the net magnetic flux and terminate the latching effect. Current sensing and diverting is accomplished by a diode connected across the one coil.

531052

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