Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1979-12-07
1981-12-15
Miller, J. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
H01F 1300
Patent
active
043062695
ABSTRACT:
A magnetic chuck control system employing solid state circuitry including a power output circuit adapted to apply a DC voltage to an object such as a magnetic chuck or the like so as to magnetize the same. The power output circuit employs a triac reversing circuit and is interfaced with a digital control circuit and a digital-to-analog converter circuit so as to apply alternating polarity voltage signals of successively reduced magnitude to the chuck during a demagnetizing operation. All high voltage is confined to the power output circuit so as to provide significant safety protection to the operator.
REFERENCES:
patent: 3164753 (1965-01-01), Schroeder
patent: 3368119 (1968-02-01), Littwin
patent: 3378734 (1968-04-01), Littwin
patent: 3401313 (1968-10-01), Littwin
patent: 3532940 (1970-10-01), Schroeder et al.
patent: 3579053 (1971-05-01), Littwin
patent: 3609465 (1971-09-01), Gruetzmacher
patent: 4158873 (1979-06-01), Schroeder et al.
Bacchiere Daniel P.
Polinski Stanley F.
Miller J. D.
Schroeder L. C.
Semi-Controls, Inc.
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