Fuzzy compensator design against windup of a magnetic actuator during milling operation

Abstract

A fuzzy anti-windup compensator is proposed and applied to the embedded cylindrical-array magnetic actuator to ensure the superior performance of spindle position regulation for milling machines under actuator saturation. Since embedded cylindrical-array magnetic actuator is a type of active magnetic bearing, the supplied coil current and the induced magnetic force are both limited by the maximum current and power output of the active magnetic bearing and the associated amplifier. Once the magnetic actuator is saturated, the required control input cannot be realized by an embedded cylindrical-array magnetic actuator and may lead to drastic tremble of the spindle position. In this work, an anti-windup compensator, based on a fuzzy logic algorithm, is therefore proposed to rectify the control input to an embedded cylindrical-array magnetic actuator. By employing commercial software, MATLAB/Simulink, and signal processing interface, Module DS1104 by dSPACE, the efficacy of the fuzzy anti-windup compensation is practically verified by intensive experiments.