DC solenoid actuator circuits

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...

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H01F 718

Patent

active

046427252

ABSTRACT:
This invention relates to DC solenoid actuator circuits.
A DC solenoid winding located to act on an armature, is connected across a rectifier connected to an AC supply. A capacitor is provided across the winding so that the initial voltage applied to the solenoid winding is greater than the average actuating voltage.
One terminal of the rectifier is connected to the AC supply via a switch which can either include in that circuit a capacitor or shunt that capacitor. The switch is mechanically linked to the armature of the solenoid winding so that at a predetermined point during the stroke of the armature the switch is operated to include the capacitor in the circuit so as to lower the actuating voltage for the solenoid.

REFERENCES:
patent: 4454558 (1984-06-01), Huddart
patent: 4481555 (1984-11-01), Yoshida et al.
patent: 4539619 (1985-09-01), Hill

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