Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1986-03-07
1988-06-28
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
335256, 361 93, 361187, H02H 708
Patent
active
047543620
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 oppositely 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 magnetically 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 diverted 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.
REFERENCES:
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patent: 3683239 (1972-08-01), Sturman
patent: 3737736 (1973-06-01), Stampfi
patent: 4227231 (1980-10-01), Hansen et al.
patent: 4263928 (1981-04-01), Kobayashi
patent: 4451865 (1984-05-01), Warner et al.
patent: 4489360 (1984-12-01), Kraicar et al.
patent: 4532570 (1985-07-01), Thornley et al.
Eaton Corporation
Gaffin Jeffrey A.
Johnston R. A.
Pellinen A. D.
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