Variable structure control of double-motors-double-screws drive system

Double-motors-double-screws (DMDS) drive system is used in the feeding system of the high precision machine tool to improve the rigidity and to eliminate the effect of the backlash nonlinearity. The parameters in this system change with the working condition, the traditional control method cannot achieve the desirable performance. In this paper, we established the mathematical model of the DMDS drive systems. We employed the variable structure controller (VSC) to deal with the parameters uncertainties and external perturbation of the DMDS drive system. Simulation results show that the proposed method achieves better performance compared to the backstepping controller.