Robust fractional order controller for a linear active magnetic bearing system

Abstract

In the paper the fractional order FID feedback control loop is designed in order to stabilize the unstable linear current-controller active magnetic bearing (AMB) system. The review for stability analysis of fractional continuous-time linear systems described by the transfer functions is given. The specified fractional order controllers, obtained for desired different phase margins, are verified by means of numerical simulations. The robust stability of fractional order PID feedback-loop is shown due to AMB parametric uncertainty.