Patent ID: 6081413
Filing Date: 2000-06-27
Classification: F01L,F02D,H01F,Y02T

Abstract:
A method for controlling armature movement in an electromagnetic circuit, comprising the following steps:(a) providing two spaced, facing electromagnets;(b) providing an armature movable between the two electromagnets along a motion path;(c) generally alternatingly energizing and de-energizing the two electromagnets for causing a reciprocating motion of the armature, whereby periodically one of the two electromagnets is a momentarily catching electromagnet and the other of the two electromagnets is a momentarily releasing electromagnet;(d) detecting the actual moments of passage of the armature during each motion from one electromagnet to the other at least at two consecutive locations along the motion path;(e) comparing signals representing the actual moments of passage with signals representing desired moments of passage of the armature at said at least two locations; and(f) dependent upon deviations determined in step (e), controlling the moment of de-energizing the momentarily releasing electromagnet and controlling the moment of energizing the momentarily catching electromagnet.