H/sub /spl infin// control of a magnetic bearing

Abstract

The problem of designing a controller for a magnetic bearing is considered in this paper using H/sub /spl infin// optimisation. Classical criteria being unable to insure a satisfying closed loop behaviour, the input and the output of the flexible modes are used as supplementary degrees of freedom. Continuous-time and discrete-time syntheses are considered. The proposed approach allows to conveniently tune the closed-loop behaviour while satisfying severe constraints on the control capability.<>