Determination of Eddy Current Effects on Radial Active Magnetic Bearings Based on a Reluctance Network and ID Eddy Current Model

The emphasis of this paper is to study the effects of eddy currents in radial magnetic bearings on the control system design and bearing dynamics. We create a model based on a nonlinear reluctance network and one-dimensional eddy current formulation. The model is a linearised model. We describe the formulation of reluctance network field solution, calculation of the linearised parameters and the implementation of the eddy current model. Two types of measurements have been done. First, we compare the dynamic impedance measurements and secondly, the dynamic bearing force measurements based on acceleration sensors.