Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1984-01-17
1989-12-12
Jennings, Derek S.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361267, H01H 1700
Patent
active
048871842
ABSTRACT:
Auto transformer supplying current to the object to be demagnetized (chuck), this current controlled by an ON set of transformers, and a DEMAG set of transformers. Each set includes a pair of secondaries providing pulsating current for respective half cycles of AC, of opposite polarity. The opposite polarity of pulsating current is produced in intervals of decreasing time and voltage, until the magnetism in the object is at or near zero. The control transformer sets are controlled by a unit establishing selected values of voltage, that voltage controlling a cross-over unit which includes transistors, which in turn control the intervals of the control transformers. A CMOS oscillator circuit, with an oscillator chip, including NAND gates, effects alternate energization of the control transformers.
REFERENCES:
patent: 2946932 (1960-07-01), Littwin
patent: 3579053 (1971-05-01), Littwin
patent: 3626255 (1971-12-01), Littwin
patent: 4354149 (1982-10-01), Armond et al.
patent: 4426672 (1984-01-01), Armond
Electro-Matic Products Co.
Gallagher Paul H.
Jennings Derek S.
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