Abstract
In this paper, we examine a design method for robust control systems with robust stability for minimum phase systems using phase information. Yamada clarified that, using phase information, low sensitivity control systems with robust stability can be achieved if the relative degree of plant is equal to or 1-degree smaller than that of the nominal plant. In many cases, it is difficult to obtain the accurate relative degree of plant. The purpose of this paper is to expand the result by Yamada and give a design method for low sensitivity control system for the system with uncertain relative degree using phase information. In order to design low sensitivity control with robust stability, we adapt the idea of fusion of robust control design using phase information and the parallel compensation technique. A design procedure for low sensitivity control with robust stability is presented. Finally, without solving interpolation problem, a design method for low sensitivity robust servo control systems with robust stability is presented.
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