Control of Axial Active Magnetic Bearing using Reduced Order Model

Abstract

Active Magnetic Bearing (AMB) moves the rotor in the air with the influence of electromagnetic field developed by current carrying coils. The utilization of different active magnetic bearing appliances like Turbo molecular pumps, Gears, Flywheels, Maglev systems etc. are expanding in industrial application due to prompt advancement in the field of electronics and control algorithms. Finite Element method permits numerical analysis for this kind of systems. In this paper, a 2 Dimensional software simulation of an axial AMB system has been performed using COMSOL. The state space system matrices are extracted by creating probe points and a large order system is generated in MATLAB. Then using Krylov subspace based method, the order of the system is reduced. A PID controller is designed using reduced model and applied for full order model. The feasibility of the controller is tested using various kind of signals and it is seen that the controller improves the performance of both systems. Therefore, this paper proposes a different approach for using reduced model instead of large order model for controlling axial active magnetic bearing.