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Appl. Sci. 2016, 6(9), 242;

L1 Adaptive Control for a Vertical Rotor Orientation System

School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Author to whom correspondence should be addressed.
Academic Editor: Chien-Hung Liu
Received: 27 May 2016 / Accepted: 19 August 2016 / Published: 29 August 2016
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Bottom-fixed vertical rotating devices are widely used in industrial and civilian fields. The free upside of the rotor will cause vibration and lead to noise and damage during operation. Meanwhile, parameter uncertainties, nonlinearities and external disturbances will further deteriorate the performance of the rotor. Therefore, in this paper, we present a rotor orientation control system based on an active magnetic bearing with L 1 adaptive control to restrain the influence of the nonlinearity and uncertainty and reduce the vibration amplitude of the vertical rotor. The boundedness and stability of the adaptive system are analyzed via a theoretical derivation. The impact of the adaptive gain is discussed through simulation. An experimental rig based on dSPACE is designed to test the validity of the rotor orientation system. The experimental results show that the relative vibration amplitude of the rotor using the L 1 adaptive controller will be reduced to ∼50% of that in the initial state, which is a 10% greater reduction than can be achieved with the nonadaptive controller. The control approach in this paper is of some significance to solve the orientation control problem in a low-speed vertical rotor with uncertainties and nonlinearities. View Full-Text
Keywords: vertical rotor; adaptive control; orientation; uncertainty; nonlinearity; stability vertical rotor; adaptive control; orientation; uncertainty; nonlinearity; stability

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Liu, S.; Fan, Y.; Di, J.; Ji, M. L1 Adaptive Control for a Vertical Rotor Orientation System. Appl. Sci. 2016, 6, 242.

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