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基于变量梯度法的磁悬浮控制系统的状态稳定性-控制理论与应用
24 4 Vol. 24 No. 4
2007 8 Control Theory Applications Aug. 2007 2007
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State stability of maglev control system based on
variable gradient method
SHE Long-hua, LU Xiao-hui, SHI Xiao-hong
(Maglev Research Center, National University of Defense Technology, Changsha Hunan 410073, China)
Abstract: Magnetic levitation system is a typical nonlinear system. A controller based on linear magnetic levitation
system can guarantee the system’s stability around the equilibrium point. In fact, under severe disturbance the system’s
stability may be destroyed. The stability of single point magnetic levitation system is analyzed. A Lyapunov function is
built by the variable gradient method, and a conservative state stability region is then derived. When the magnetic levitation
system moves away from the stability region by severe disturbance, an adaptive control action should be taken. Finally the
feasibility of this method is testified by our experiments.
Key words: magnetic levitation control; state stability; variable gradient method
1 (Introduction) 2 (Magnetic levitation sys-
tem model)
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