A Proposal for Precison Positioning Control of Linear Induction Motor Using Nonlinear Friction Compensation and High-Order Disturbance Observer

The linear induction motor (LIM) is cost-effective, but exhibits low positioning precision because of the presence of nonlinear friction. This paper deals with the precise positioning control method of a LIM using a high-order disturbance observer and modeling and compensation for nonlinear rolling friction of a linear ball guide attached to the LIM. Through various experiments, we demonstrate that the positioning precision of our proposed method is smaller than ± 0.15 (μ m).