Abstract
This paper utilizes the method of Q-parameterization control 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 compensation). 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. The free parameter of the Q-parameterization controller is chosen such that these goals are achieved. After the introduction of a mathematical model of the magnetic bearing system, we explain the Q-parameterization controller design of the magnetic bearing system with emphasis on the rejection of sinusoidal disturbance for imbalance compensation design and the rejection of sinusoidal sensor noise for automatic balancing design. The design objectives are formulated as a linear equations in the controller free parameter Q. Finally, simulation and experimental results are presented and showed the robustness and effectiveness of the proposed controllers.
