Abstract

In this paper, one improved speed control algorithm of the linear induction motor (LIM) using finite-set model predictive direct thrust control (FS-MPDTC) is firstly proposed. Then speed estimation method for LIM is proposed using model reference adaptive system (MRAS) method. FS-MPDTC is used to reduce the thrust ripples instead of conventional direct thrust control. PI controller is used to regulating the speed where the output of the PI controller serves as the reference thrust of FS-MPDTC. The proposed control scheme aims at improving the performance of the LIM drive system, where low cost, low thrust and flux ripple and fast response can be achieved. A platform is developed in the laboratory with two 3 kW arc induction motors. Comprehensive simulations and experimental results have demonstrated that the proposed control scheme has a better performance in reducing the ripples associated with both thrust and flux linkages waveforms. Moreover, the obtained results confirm the effectiveness of the estimation method in tracking the measured speed.