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

将所提出的非线性控制系统应用于某四自由度储能飞轮系统的实际试验台，验证了磁轴承系统零功率控制的性能。仿真和实验结果表明，本文所提出的非线性控制方法是实现磁轴承系统零功率控制的一种非常有效的方法。此外，由于非线性控制，该控制策略将是非常强大的稳定大偏差的平衡点。此外，所提出的零功率非线性控制对参数变化和大的干扰，如不平衡振动具有很强的鲁棒性。基于李亚普诺夫直接法设计了非线性控制系统。根据转子的位移和速度，通过非线性算法切换电磁铁。该控制系统最显著的特点是设计过程简单而不复杂，因为每个控制系统都等效为一个单自由度振动系统，只有阻尼因子和固有频率两个参数。

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.