Electromagnetic contact device

Details Electromagnetic contact device Electromagnetic contact device

1982-09-21

1984-11-06

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

361156, 361194, 361206, H01H 4710

Patent

active

044815557

ABSTRACT:
An electromagnetic contact device performs on-off operations for opening and closing an electrical path, without causing the hunting phenomenon between the two contact points in the device not only during closure of a fixed contact point and a movable contact point therein, but also when a voltage to be applied to an operating coil has lowered. An operating coil generates a predetermined energizing force in combination with a fixed iron core, a starting circuit rectifies a large capacity electric current from an AC power source when attracting a movable iron core and supplies the rectified current to the operating coil. A holding circuit supplies the large capacity current from the AC power source to the operating coil through means of converting the large capacity current to a small capacity current at the time of holding the movable iron core. A change-over switch changes the energizing current supply source for the operating coil from the starting circuit to the holding circuit, the change-over switch having a hysteresis characteristic such that it performs its off-operation after closure of both contact points when the main circuit is closed, and performs its on-operation after separation of both contact points when the voltage to be applied to the operating coil has been lowered.

REFERENCES:
patent: 3943416 (1976-03-01), Degenhart

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