Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1981-01-02
1983-01-25
Rubinson, G. Z.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361149, H01F 1300
Patent
active
043706932
ABSTRACT:
In the electromagnet control apparatus described herein, demagnetization of the electromagnet and a workpiece held thereby, following a period of holding, is effected by stepwise adjustment of the phase setting of a power control means such as a triggerable, semi-conductor switching device, thereby controlling the average AC voltage applied to a full wave bridge through which the electromagnet is energized. Reversing switch means are interposed between the bridge and the electromagnet for reversing the direction of the energizing current at each successive step.
REFERENCES:
patent: 3579053 (1971-05-01), Littwin
patent: 3619729 (1971-11-01), Littwin
patent: 3626255 (1971-12-01), Littwin
patent: 3895270 (1975-07-01), Maddox
patent: 4013932 (1977-03-01), Aggarwal
J. D. Reed, "Degaussing Electromatic Articles by the Phase Control of AC Power," Western Electric Tech. Digest No. 33, Jan. 1974, pp. 45-46.
Ela Roger B.
McDonald Donald C.
Pignataro Dominic F.
Rubinson G. Z.
Schroeder L. C.
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