A new model- free adaptive controller versus non-linear H∞ controller for levitation of an electromagnetic system

In this paper we aim to survey the performance of a non-linear H-infinity method and a new proposed controller on a magnetic levitation model (maglev). The proposed controller is a new model-free adaptive design approach using an adaptive-fuzzy procedure based on feedback linearization. The main idea of the new controller comprises two steps: first, by means of the feedback linearization method, a measured signal is taken to a specific level with an error less than a defined value and second, proposed rules are applied to the system to keep the error near zero. The major advantage of new controller is that there is no need for identification of the system dynamics and only the output error is required.