Q-Parameterization Control of Magnetic Bearing Systems with Imbalance

his paper utilizes the Q-parameterization theory to design a controller which solves the problem of imbalance in magnetic bearing systems.There are two methods to solve this problem using feedback control. The first method is to compensate for the imbalance forces by generating opposing forces on the bearing surface (imbalance compenstion).The second method is to make the rotor rotate around its axis of inertia (automatic balancing) ;in this case no imbalance forces will be generated. After the introduction of a mathematical model of the magnetic bearing system,the controllers which can reject the disturbances caused by imbalance on the rotor are designed, based on the Q-parameterization theory. Simulation results are presented and showed the robustness of the proposed controllers.