Variable structure control of AC servomotors for performanceimprovement in CNC applications

摘要

A variable structure controller is developed for AC servomotorsused in computer-numerical-controlled (CNC) milling machines. Thecontroller designed is implemented as an outer loop controller to afactory designed motor servo-pack system. The variable structurecontroller is designed for a fast response when the speed tracking erroris large, and for small oscillations when the speed tracking error issmall. The controller designed is installed on a CNC milling machineusing a PC, and milling experiments were performed. The results showimproved performance over the factory-designed controller