Bottom-fixed vertical rotating devices are widely used in industrial and civilian fields.\nThe free upside of the rotor will cause vibration and lead to noise and damage during operation.\nMeanwhile, parameter uncertainties, nonlinearities and external disturbances will further deteriorate\nthe performance of the rotor. Therefore, in this paper, we present a rotor orientation control\nsystem based on an active magnetic bearing with L1 adaptive control to restrain the influence\nof the nonlinearity and uncertainty and reduce the vibration amplitude of the vertical rotor.\nThe boundedness and stability of the adaptive system are analyzed via a theoretical derivation.\nThe impact of the adaptive gain is discussed through simulation. An experimental rig based on\ndSPACE is designed to test the validity of the rotor orientation system. The experimental results show\nthat the relative vibration amplitude of the rotor using the L1 adaptive controller will be reduced\nto âË?¼50% of that in the initial state, which is a 10% greater reduction than can be achieved with\nthe nonadaptive controller. The control approach in this paper is of some significance to solve the\norientation control problem in a low-speed vertical rotor with uncertainties and nonlinearities.
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