Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1992-10-19
1994-12-27
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361210, H01H 4704
Patent
active
053770684
ABSTRACT:
A control system for an electromagnetic device prevents overheating of the coils to permit optimizing design parameters without the need for excessive safety factors. A pull coil circuit feeds a high current to pull windings for a preset time interval after receipt of an initiating voltage. A hold coil circuit feeds a holding current to holding windings with a reduced flux after receipt of an initiating voltage only if it exceeds a preset voltage threshold. The hold current is cut off when the initiating voltage falls below a preset threshold. The pull coil circuit is rendered inoperative for a preset time interval after current is discontinued to ensure adequate cooling between operations.
REFERENCES:
patent: 2970246 (1961-01-01), Gunkel
patent: 3449639 (1969-06-01), Brown et al.
patent: 3568008 (1971-03-01), Tanimura
patent: 4114184 (1978-09-01), Stampfli
patent: 4609965 (1986-09-01), Baker
Kaylor Stephen
Yowell Gordon
Blum Alvin S.
Gaffin Jeffrey A.
Predator Systems Inc.
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