Electromagnet apparatus with shortened armature release time

Details Electromagnet apparatus with shortened armature release time Electromagnet apparatus with shortened armature release time

1986-02-26

1987-04-28

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Including means for using, or compensating for, the induced...

H01H 4732

Patent

active

046618830

ABSTRACT:
An electromagnet coil 2 wound on a fixed iron core 6 is energized by d.c. current supplied from a full-wave rectifier 1 to attract a movable armature 7. A transistor 10 is connected in series with the coil, a bias resistor 8 is connected across the coil to the base of the transistor, and a capacitor is connected between the base and collector of the transistor. The capacitor absorbs inductive energy stored in the coil 2 when the a.c. supply circuit is opened to thereby reduce the armature release time.

REFERENCES:
patent: 4032823 (1977-06-01), Arvisenet
patent: 4274122 (1981-06-01), Hansen et al.

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