Fast-response positioning using H∞ control in machine tools

This paper presents a robust positioning algorithm for the fast-response and high-precision machine tool drives. In the research, a robust compensator designed by the H_∞ control framework is applied to the positioning system in machine tools, where the resonant vibration suppression, the robust stability against parameter variations of unknown vibration modes, and the fast servo characteristic are paid particular attention to the robust compensator design. As a result, the desired positioning with the robust performance can be achieved. The effectiveness of the proposed controller has been verified by experimental results using a positioning system of industrial machine tools.