Method of recognizing whether an armature is in contact with an

Details Method of recognizing whether an armature is in contact with an Method of recognizing whether an armature is in contact with an

1998-07-31

2000-03-07

Jackson, Stephen W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 18, 361115, H02H 300

Patent

active

060348569

ABSTRACT:
A method of recognizing the contact of an armature in an electromagnetic actuator for activating a setting member that can be brought out of a first set position, counter to the force of a restoring spring, and brought into contact with the pole surface of the electromagnet and held when the electromagnet is supplied with current. The controlled (clocked) current course for the holding phase is detected during the time provided for armature contact, and is converted into a current-proportional voltage, and the converted voltage is differentiated and detected as a recognition signal, both for the normal condition of "armature in contact" and the fault condition of "armature is not in contact."

REFERENCES:
patent: 5691680 (1997-11-01), Schrey et al.
patent: 5791305 (1998-08-01), Kather

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