Electromagnetic contactor with current regulated electromagnetic

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...

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Details

364483, 361205, 335231, H01H 4700, G01R 2100

Patent

active

047207612

ABSTRACT:
An electromagnetic contactor is taught which includes a conduction angle controlled triac or similar gated device which is connected in series circuit relationship with the winding of an electromagnetic solenoid or coil which is responsible for closing the contactor contacts and for keeping them closed. The current flowing through the triac is fed to a microprocessor which digitizes the current and compares it to a stored standard. The conduction angle is then decremented or incremented as necessary to change the conduction angle to cause less or more current to flow per half cycle until the amount of current flowing as sensed on a half-cycle-by-half-cycle basis is equal to the current represented by the stored standard.

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patent: 4584623 (1986-04-01), Bello et al.
patent: 4626956 (1986-12-01), Naito
patent: 4638279 (1987-01-01), Brisson et al.

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