Industrial servo applications of linear induction motors based on dynamic maximum force control

Linear induction motor (LIM) drives have been investigated vastly for the past several decades. Attractive features, such as simple structure and easy maintenance, have made this family of machines utilized broadly in military, transportation, and aerospace, to name a few. Especially, LIM is suitable for industrial servo applications. Up to nowadays, vector control is a dominant control strategy for LIM based on the assumption that this family of machines portrays inherent similarities with their rotary counterparts. However, due to existence of end effects and magnetic asymmetry effects, conventional vector control can not provide its expected functionality for LIM. Therefore, a novel control strategy, dynamic maximum force control, has been invented and introduced in. From simulation study, it has shown that at any instant maximum force production is guaranteed. In addition, the regulation of linear speed during transient and steady state is satisfactory. Meanwhile, steady state ohmic loss is minimized. In this paper, position of linear induction motors is controlled based on dynamic maximum force control strategy. Simulation results are presented for verification of control performance.