Compensation of static end effects in linear induction motor drives by frequency-adaptive synchronous controllers

Both the static and the dynamic end effects of the linear induction motor (LIM) cause an increase of the difficulty in controlling with good performance the main electro-mechanical characteristics of the machine, in particular the thrust and the linear speed. These effects are related to asymmetries in the inductor structure with respect to the rotating counterpart, in both the longitudinal and in the transversal direction. This paper propose a technique for the compensation of the LIM static end effects by a synchronous controller in conjunction with a neural adaptive filter, exploited to extract the inverse sequence current component from the inductor current signature. This permits to compensate the static-end effects and thus to cover the static asymmetries of the LIM with respect to the rotating induction motor (RIM).