Patent ID: 7709984

Claim:
A device for determining an excursion of a movable shaft from a center of a stationary stator, comprising: an excitation winding system disposed on the stator with a number of pole pairs Perr, and two mutually offset output winding systems, each of the output winding systems having a number of pole pairs Paus and at least two terminals, with |Perr−Paus|=1, wherein the shaft is spaced from the stator by an air gap, a voltage source supplying an AC voltage to the excitation winding system, and an evaluation device which measures two voltages induced at the at least two terminals of the output winding systems and determining the shaft excursion from the center according to the following equation: Shaft excursion=constant1·√{square root over ( U 1 2 +U 2 2 )}, wherein constant 1 is a first constant and U 1 and U 2 are the voltages induced at the at least two terminals of the two mutually offset output winding systems.