Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
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
Gellner Michael L.
Gray David M.
Sharp Kabushiki Kaisha
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