Low noise solenoid drive

Details Low noise solenoid drive Low noise solenoid drive

1984-07-09

1987-02-03

Gellner, Michael L.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

361154, H01H 4732

Patent

active

046412190

ABSTRACT:
A solenoid drive system includes a driver circuit which functions to gradually increase current flowing through a solenoid coil. The attracting force created by the solenoid is proportional to the current flowing through the solenoid coil. When the attracting force becomes greater than a load including the plunger, the plunger moves toward the operating end. At a time when the plunger reaches the operating end, the current is still in the increasing curve and, therefore, an excess force is minimized. This functions to minimize noises created by the plunger movement.

REFERENCES:
patent: 4473861 (1984-09-01), Kosak et al.
patent: 4485425 (1984-11-01), Gruner et al.
patent: 4516185 (1985-05-01), Culligan et al.
patent: 4567975 (1986-02-01), Roll

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