A Nonlinear Switching Control Method for Magnetic Bearing Systems – Minimizing the Power Consumption –

Nonlinear Output Feedback Control of a 5dof Amb System

“…Relative Degree of Actuator A discussion similar to that of (Liu et al, 2002) reveals that the relative degree is not defined at the equilibrium if the bias current is = 0. So a bias current = 0 is applied on the four pairs of electromagnets in order for the backstepping technique to be applicable.…”

“…Furthermore, the control Therefore, in recent years in order to design AMB systems with low power consumption, approaches called "zero-bias" or "zero-power" and "low-power", in which zero bias or low bias is used, are emerging as popular alternatives. See (Ariga et al, 2000;Liu et al, 2002;Charara et al, 1996;Tsiotras and Velenis, 2000;Motee et al, 2002;de Queiroz and Dawson, 1996b;de Queiroz and Dawson, 1996a;Knospe and Yang, 1997;Lévine et al, 1996).All these aforementioned approaches are fundamentally state feedback based.…”

Low-Power Control and System Performance Research for Magnetic Flywheel

“…To lower the copper loss, the way is improving the control algorithms to reduce even remove the bias current, then the copper loss will be lowered, and it has been a research focus. Liu and Ikai designed a low-power controller based on the non-linear switching control method, and obtained good simulation results on a single degree of freedom system [4]. However, it is difficult to obtain good control effect when the algorithm of single freedom degree was used to control the flywheel with high gyroscopic effect.…”