Electromagnet power supply and demagnetizer

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

Patent

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Details

335290, 361149, 361267, H01F 1300

Patent

active

044020325

ABSTRACT:
An electronic current control device for energizing and de-energizing an electromagnet, such as a magnetic chuck, includes a DC power source preferably in the form of a phase-controlled SCR power unit. A conduction angle control signal is routed to positive or negative gates in the power unit to determine polarity and amplitude of direct current through the electromagnet windings. In the "on" mode an analog current feedback loop maintains a predetermined magnetizing level of current through the windings. In the demagnetize mode, a digital system decreases the current amplitude stepwise while alternating the polarity. When the sensed current attains the selected peak level for a given step, a digital count is decremented. The polarity is reversed according to the odd or even count, and a new peak reference level is established corresponding to the digital count.

REFERENCES:
patent: Re25607 (1964-06-01), Littwin
patent: 3532940 (1970-10-01), Schroeder et al.
patent: 3872626 (1975-03-01), White

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