Verfahren zur Nullpositionierung eines Zeigers

摘要

Proposed is a method of reducing the magnitude of an uncontrolled movement of an instrument pointer (14) driven by a step motor and which lies against a mechanical stop (11) when the motor (14) is switched off. To achieve this, the strength of the magnetic field of the motor (14) is lowered or the pointer (10) moved, before the motor is switched off, through a predetermined angle of compensation ( DELTA phi ) away from the stop (11) or the step motor (14), after it has been switched off, is switched on again at least once after a predetermined length of time (ta1, ta2, ta3) for a predetermined length of time (te1, te2, te3).