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Stability Enhancement of MLB System via Servo Approach

Nitisak Numanoy and Jiraphon Srisertpol
School of Mechanical Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand

Abstract—A magnetic levitation ball (MLB) is required to operate over large variations in the air gap. Specifically, it may be difficult to design a linear controller that can provide satisfactory performance, stability and disturbance rejection over a wide range of operating points. Conventional controllers with the linearisation of a nonlinear system exhibit a low-efficiency control performance. To simplify a complex control system, in this paper, we analyse the robustness and stability of disturbance for a magnetic levitation system using Jacobian linearisation from the equilibrium point, by adding one integrator in an open-loop model and servo control system design with a state observer. The experimental results show that this method can be effectively controlled by dynamic response criteria of the control system.

Index Terms—MLB, stability, linearisation, servo, observer.

Cite: Nitisak Numanoy and Jiraphon Srisertpol, "Stability Enhancement of MLB System via Servo Approach," International Journal of Mechanical Engineering and Robotics Research, Vol. 7, No. 5, pp. 471-477, September 2018. DOI: 10.18178/ijmerr.7.5.471-477