Modeling and Control of a Hybrid Magnetic Bearing in a Ring-Type Flywheel System

In this study, a hybrid magnetic bearing (HMB) is proposed for a ring-type flywheel system. The HMB is composed of passive and active units. The rotor weight will be fully supported by the lateral forces of the passive units. The other 4 DOFs will be levitated and controlled by the active units. We will first establish the magnetic force model of the passive and active units of the proposed HMB. With the magnetic force models in hand, a stabilizing levitation controller for the HMB is designed. Moreover, numerical simulation results verify the effectiveness of the controller.