Order Reduction Adaptive Current Tracking Control with Proportional–Integral-Type Filter for MAGLEV Applications

The proposed adaptive controller robustly tracks the coil current to its desired trajectory, regulating the target position of the magnetic levitation (MAGLEV) systems under the modeling errors and load variations. This paper makes the following two contributions. First, the order reduction proportional–integral filter replaces the conventional low-pass filter for the current measurement without the signal distortions in the high-frequency operation modes. Second, the proposed technique consists of the proportional-type feedback control and parameter adaptation mechanism estimating the DC component of the uncertain disturbances, involving only one design parameter. The practical advantages of the proposed technique are validated by the numerical simulations based on MATLAB/Simulink (ver. 2017b) considering the nonlinear dynamics of the MAGLEV systems and modeling errors.