Patent ID: 7598697

Claim:
A method for finding the position of an armature in relation to a stator of a motor, in the case of which the armature is driven by an exciting field which is produced by exciting windings of the stator, and the armature is caused by the exciting field to perform an oscillatory motion, whose progression is detected by a position measuring means for measuring positions of the armature and is evaluated to determine the relative position, the method comprising: designating a target value signal, applying for an oscillation, to a commutation means for current flow in the exciting windings; modifying a designating commutation offset value in the commutation means within a value range essentially corresponding to the distance between two adjacent poles of the armature, the designating commutation offset value defining an assumed relative position with reference to at least one exciting winding of the stator; causing flow of current through the exciting windings on the basis of the respective designating commutation offset value and of the target value signal so that the armature is driven to perform an oscillatory motion corresponding to the target oscillation; and finding at least one actual commutation offset value in the case of which the oscillation amplitude of the oscillation motion is near its maximum.