Device for Determining a Shaft Center Deviation

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 (U12+U22)},
• wherein constant1 is a first constant and U1 and U2 are the voltages induced at the at least two terminals of the two mutually offset output winding systems.

A method for determining an excursion of a movable shaft from a center of a stationary stator, the stator having 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 two terminals, with |Perr−Paus|=1, wherein the shaft is spaced from the stator by an air gap, said method comprising the steps of:

• supplying an AC voltage to the excitation winding system,
• measuring an output voltage at the two terminals of the output winding systems, and
• determining the excursion from the center from the measured output voltages from the following equation
• Shaft excursion=constant1·√{square root over (U12+U22)},
• wherein constant1 is a first constant and U1 and U2 are the voltages induced at the two terminals of the two mutually offset output winding systems.