Abstract
In this paper, one improved speed control algorithm of linear induction motors (LIMs) using sliding mode control (SMC) is firstly proposed. Then, an extended sliding mode load thrust observer (ESO) has been proposed to compensate the sliding mode controller under the load thrust disturbance. Moreover, the SMC integrated with ESO is designed based on direct thrust control (DTC) technique with space-vector modulation (SVM) to regulate speed, flux, and thrust of the LIM. The output of the SMC is considered as the reference thrust for the DTC based on space-vector modulation (DTC-SVM). A comparison between the proposed method and the conventional method with PI controllers is presented to illustrate the superiority of the proposed control method. Comprehensive simulation results have demonstrated that the proposed control scheme has a better transient control performance with a fast and good speed tracking.