DYNAMIC MODELING AND OPTIMAL-CONTROL OF CONE-SHAPED ACTIVE MAGNETIC BEARING SYSTEMS

In a cone-shaped active magnetic bearing (AMB) system, the rotor motio n is controlled simultaneously in the axial and radial directions by t wo radial bearings with cone-shaped magnetic core. In this work, a ful ly coupled dynamic model for a cone-shaped AMB system is developed, in cluding the relationships between input voltage and output current in the cone-shaped magnet coil. Based on the linearized dynamic model, th e procedure for designing optimal controllers is shown. The modeling a nd control schemes are then applied to a laboratory AMB system in orde r to verify the analytical developments. It is found that the experime ntal results agree well with the analytical developments in the stabil ization and tracking performance of the controled system.