Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1982-07-06
1984-08-21
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
335289, 361204, H01F 1300
Patent
active
044673884
ABSTRACT:
An electromagnetic chuck power supply and control comprising a magnetic amplifier consisting of a saturable reactor supplying DC power at its output across the electromagnet coils of the electromagnetic chuck. A controllably variable DC current is supplied across the control winding of the magnetic amplifier such that the DC power at the output of the magnetic amplifier is inversely proportional to the DC current flow through the control winding. Variable workpiece holding power is thus obtained at the electromagnetic chuck. At full control current flow, the electromagnetic chuck has no holding power except that due to the residual magnetization of the workpiece. In the event of complete failure of the control current circuit, maximum holding force is applied by the chuck to the workpiece. Automatic de-magnetization of the workpiece is provided by applying a gradually increasing DC voltage across the control winding of the magnetic amplifier and sequentially reversing the current flow at the output of the magnetic amplifier such as to supply alternative current pulses of progressively decreasing amplitude to the chuck electromagnet coils.
REFERENCES:
patent: 3034021 (1962-05-01), Callihan
patent: 3187155 (1965-06-01), Becbert et al.
patent: 4306269 (1981-12-01), Bocchiere et al.
patent: 4402032 (1983-08-01), Wilterdink
Hitachi Metals International Ltd.
Moose Jr. Harry E.
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