Nonlinear Control of Zero Power Magnetic Bearing Using Exact Linearization and Sliding Mode Control

点击翻译按钮获取中文摘要

The proposed nonlinear control system is applied to the actual test rig which is some kind of energy storage flywheel system with 4 DOF, and the performance of a zero power control for magnetic bearing system is verified. It is clarified through the simulations and experiments that the proposed nonlinear control in this research project is a very useful strategy to realize a zero power control of magnetic bearing system. Also, this proposed control strategy will be very powerful to stabilize for big deviations from the equilibrium point because of nonlinear control. Also, the proposed zero power nonlinear control has a strong robustness against the parameter changes and the big disturbances like a unbalance vibration. The nonlinear control system is designed based on Lyapunov's direct method. The electromagnets are switched by the nonlinear algorithm depending on the displacement and the velocity of a rotor. The most remarkable feature of this proposed control system is not complicated but simple for design procedure because each control system is equivalent to a single-degree of freedom vibration system which has only two parameters as to a damping factor and natural frequency.