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A discrete-time design and analysis of perturbation observer for motion control applications

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2 Author(s)
SangJoo Kwon ; Dept. of Mech. Eng., Pohang Univ. of Sci. & Technol., South Korea ; Wan Kyun Chung

A discrete perturbation observer (DPO) is suggested in state-space form for motion control applications. In existing disturbance observer design methods, the low-pass filter (so-called Q-filter) is central. However, the effect of the Q-filter on performance and robustness has not been clarified, specifically in the discrete-time domain. Considering the discrete Q-filter, with general order and inertia perturbations as a structured model uncertainty, we clarify how the performance and robustness of the perturbation observer are changed according to the variation of the Q-filter parameters and model parameter (i.e., inertia) perturbations in discrete control systems. Experimental results show the validity of the analysis and the effectiveness of the DPO.

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Control Systems Technology, IEEE Transactions on  (Volume:11 ,  Issue: 3 )