Position Controller with Hysteresis Compensation for Magnetic Bearings

This paper deals with the Jiles-Atherton model for hysteresis effects and its inversion as well as its extension for the reproduction of force-current hysteresis loops. An identification procedure for the model parameters is presented for a given solenoid actuator. A simplified hysteresis compensation algorithm was implemented on a 16-bit Digital Signal Controller. The real-time hysteresis compensation quality both for constant and variable air gap lengths was first investigated by means of an open-loop force controller for a proportional solenoid. Finally a closed-loop position controller with hysteresis compensation for an electromagnet, which is part of a magnetic bearing system, is presented. Experimental results gained at the test rigs are shown and evaluated.