Optimum Design of the Magnetic Bearing-Controlled Rotor System

This paper proposes a design method which synthesizes the optimum design of the rotor structure, the control system, and the magnetic bearing simultaneously. We first derive the model of the electromagnetic bearing-controlled rotor system. A criterion based on minimizing the rotor response and the control current is then used to seek the optimum bearing dimensions. This criterion needs to solve the Riccati equation. The constraint on the peak rotor time response, the control current, and the flux density of the bearing's stator are included in this study. Sensitivity analysis of both the cost function and the constraints are also described. Numerical analysis shows the effect of different weightings and the superiority of this design methodology.