PEEC-Based Numerical Optimization of Compact Radial Position Sensors for Active Magnetic Bearings

Abstract:
Eddy current sensors are widely used in active magnetic bearing systems to determine the position of the levitated rotor. This work is dealing with the numerical optimization of a radial eddy current position sensor to achieve a large output signal. A valid simulation model must be able to model the magnetic coupling between the sensor components as well as skin- and proximity effect. The Partial Element Equivalent Circuit (PEEC) method is best suited for these demands. In this paper, parameters of an existing sensor layout are investigated numerically, regarding the sensor output signal in dependency on parameters as excitation frequency and winding ratios. Furthermore, alternative layout geometries are discussed and compared to the classical sensor layout.