Nonlinear Zero Power Control of Magnetic Bearing-Flywheel System Using Backstepping Procedure

Abstract

In this study, a nonlinear control design based on backstepping approach is proposed for an energy storage flywheel rotor-zero power AMB system. A vertically constructed flywheel rotor magnetic bearing system is modeled with nonlinearity. The rotor is assumed to be rigid and the cylindrical and conical modes of the rotor are considered. The equation of the rotor-AMB system is transform to have a collocated system between control input and displacement of the rotor. One of the improvements obtained in this study is the low loss of the AMB system due to decreased control currents. Simulation and experimental results showed good improvements for practical implementations.