Abstract
The objective of this paper is to design three different robust controllers such as proportional-integral (PI), internal model control (IMC), and H∞ control techniques for position control of the computerized numeric controlled machine tool (CNCMT) system. The proposed controllers aim to control the servo motor that regulates the position of the machine table and also enhances the robustness of the CNCMT system under the influence of parametric uncertainties. The stability of the uncertain CNCMT system with all designed controllers is investigated using Kharitonov’s theorem. The stability margin (SM) criterion is utilized for robustness analysis.
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