Modeling and Control of Magnetic Bearings with Nonlinear Magnetization

In this paper a nonlinear modeling approach is proposed to operate magnetic bearings above the linear range and near the material saturation point. The goal is to get higher load capacity from an existing AMB system by just changing the software. In order to do this, the system should be operated in the nonlinear region of the magnetization curve and therefore should be modeled nonlinearly. Simulation results show approximately twice the force capability. The controller designed using this approach has a much better transient response and domain of attraction.