Abstract: Act ive magnetic bear ing (AMB) is a complex system which integrates mechanism, electricity and magnet ism. Aimed at the asymmetr y and strong coupling bear ing structure, a design method of controllers based on thecur rent distribution of bear ing magnet ic poles is suggested in this paper. This met hod divided the customary controller into two parts: the feedback adjuster and cur rent distributor so the design of controller is predigested. In thispaper, t he current distr ibutor is discussed, and it is applied to a cone-magnetic bear ing system, while the distr ibutoris designed.

Key words: active magnetic bearing(AMB), the asymmetry structure, strong coupling bearing, the feedback adjuster, magnetic pole current assigner