Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1979-10-09
1981-12-15
Miller, J. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361149, 361159, H01F 1300, H01F 720
Patent
active
043062687
ABSTRACT:
A circuit for controlling operation of an electromagnet includes a source of voltage connectable to the electromagnet to produce current flow in one direction and develop a magnetic force therein. A dissipating circuit is connectable to the electromagnet to form a closed loop and has impedance means for dissipating stored energy with gate means between the closed loop and the source producing current flow from the source through the closed loop when the residual potential drops to the potential of source and produce reverse current flow through the magnet. The circuit also has a reverse current limiting means in parallel with the impedance means and includes a manually variable resistor to adjust the limit of reverse current flow.
REFERENCES:
patent: 3629663 (1971-12-01), Butkus
patent: 3723825 (1973-03-01), DeViney
patent: 3859571 (1975-01-01), Strobl et al.
Femal Michael J.
Miller J. D.
Schroeder L. C.
Square D Company
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