Method of controlling armature movement in an electromagnetic ci

Details Method of controlling armature movement in an electromagnetic ci Method of controlling armature movement in an electromagnetic ci

1995-09-28

1998-04-21

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

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

361191, H01H 4700

Patent

active

057424675

ABSTRACT:
A method of controlling movements of an armature in an electromagnetic circuit which includes at least one holding solenoid applying magnetic forces to the armature and at least one resetting arrangement for applying a resetting force to the armature. The method includes the following cyclical steps: switching on a holding current to flow through the solenoid for holding the armature at the solenoid; after a predetermined period, switching off the holding current for causing the armature to begin a motion away from the solenoid; after switch-off of the holding current detecting, across the solenoid, a voltage change caused by the displacement of the armature for recognizing a starting moment of armature motion from the solenoid; and deriving a control signal from signals representing the voltage change ascertained in the course of the detecting step.

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