Composite field-oriented control for linear induction motor based super-twisting sliding mode observers

A composite sliding mode field-oriented control (FOC) for linear induction motors (LIM) is developed in this paper. A new sliding-mode observer-controller scheme is designed to provide a line speed tracking, in which the observer can estimate the load thrust and feed back to controller for small switching gain of sliding mode controller. The control scheme also incorporates super-twisting sliding mode observers of current and rotor flux, so as to improve the LIM control performance. Simulated and experimental results show that this scheme can provide fast dynamic characteristics and strong robustness.