Protective device for electromagnets

Details Protective device for electromagnets Protective device for electromagnets

1998-09-24

2000-07-11

Jackson, Stephen W.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361 911, 361111, 361118, H01H 900, H02H 900

Patent

active

060882107

ABSTRACT:
A solid state device protects large industrial electromagnets from the effects of dissipating stored magnetic energy when the supply voltage to the electromagnet is removed (for example, by accidental cutting of the power cables) while the electromagnet is energized. The device also serves as a safety device to protect operating personnel against serious injury or death when the personnel disconnect the electromagnet and power cables while the electromagnet is energized. The device monitors the voltage at the terminals of an electromagnet and, when the voltage exceeds a predetermined trigger voltage indicating an open magnet discharge path, causes the magnet energy to be safely dissipated in a power semiconductor circuit.

REFERENCES:
patent: 3708685 (1973-01-01), Miller et al.

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