Electrical contactor with controlled closure characteristic

Details Electrical contactor with controlled closure characteristic Electrical contactor with controlled closure characteristic

1990-02-01

1992-07-07

Stephan, Steven L.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361205, 364483, 335231, H01H 4726, H01H 900, G01R 1900

Patent

active

051288257

ABSTRACT:
A microprocessor controlled electrical contactor monitors the voltage and peak current produced by a first voltage pulse gated to the coil of the contactor electromagnet and adjusts the conduction angle of the second pulse to deliver a constant amount of electrical energy to the electromagnet coil despite variations in coil resistance and supply voltage so that the contactor contacts can be consistently closed with low impact velocity and minimum contact bounce. Normally, the third and subsequent pulses are gated to the coil at constant conduction angles selected so that the contacts consistently touch and seal on a preselected pulse with declining coil current. Under marginal conditions, determined by the peak current produced by the first pulse, the third and subsequent pulses are gated at substantially full conduction angles to assure contact closure. If the voltage or current produced by the first pulse is below a predetermined value, closure is aborted.

REFERENCES:
patent: 4720761 (1988-01-01), Saletta
patent: 4720763 (1988-01-01), Bauer
patent: 4833565 (1989-05-01), Bauer et al.

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