Stiffness of Magnetic Bearings

The chance to apply magnetic bearings depends on the possibility, to improve their static and dynamic performance. Intensive considerations on the dynamic performance of magnetic bearings made clear, that the stiffness depends on the dynamic performance of the - measuring system, - electronic controller, - power-electronic devices and - the eddy currents in the iron core of the bearing. The paper shows the theoretical description of the dynamic performance of a magnetic bearing. From these are derived demands to the above mentioned components.