Electromagnetic contactor with closure fault indicator

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

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32420716, 32420724, 324418, 324656, 340643, 340664, 361 87, 361187, G01R 3106, G08B 2100, H02H 326

Patent

active

052046338

ABSTRACT:
An electromagnetic contactor assembly with a sensing circuit for determining contactor state based upon the reluctance of the contactor coil. The coil has an electromagnetic coil and a movable contact separated from the coil by a gap when the coil is not energized. Energizing the coil causes the movable contact to close the gap and contact the coil. The determination of the relationship between the reluctance in the coil when the gap is in an open and closed state allows contactor gap status to be measured by measuring the coil inductance. A sensing circuit is added to the drive circuit to measure changes in AC current during the pulse cycle which holds the contacts in this closed position. The sensing circuit measures the AC current and is able to signal contactor status based on that value.

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