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A. Schulz, A. Gamez Sangra, M. Neumann, J. Wassermann:
"Modeling and simulation of a sophisticated active magnetic bearing system with supreme reliability";
in: "Proceedings of 10th International Conference on the Theory of Machines and Mechanisms", M. Bilek, J. Mrazek, M. Smolkova, P. Zabka (ed.); Technical University of Liberec, Liberec, Czech Republic, 2008, ISBN: 978-80-7372-370-5, 525 - 530.

Within the scope of a nationally supported research project a comprehensive concept for an active magnetic bearing (AMB) systems´ reliability has been developed, which not only offers an improvement within single areas, but supreme reliability of the whole AMB-system.
Thus, supreme reliability shall be guaranteed over the whole operation time and the bearing capacity shall be maintained even in case of a failure within any sub-assembly. Each AMB system consists of completely decoupled electro magnet (EM)-channels configured in hot redundancy, comprising dedicated electro magnets, controlled and driven by decentralized hot-swap controller amplifier modules with local error detection. On occurrence of an error within an EM-channel this error is detected by the local error detection, the defective EM-channel automatically shuts down and the adjacent redundant EM take over bearing functionality. The defective EM-channel can be replaced in a hot-swap procedure. To analize the behaviour of this new AMB-system a comprehensive MATLAB-Simulink model has been built, which is based on a bearing test rig, currently under construction. Within this paper an overview of the MATLAB-Simulink model of the rotor as well as the complete system is given. Simulation results document the bearing functionality at normal operation as well as EM-channel-errors and the hot swap of EM-channel sub-assemblies. Even during application of heavy disturbance forces a maximum rotor deviation at the AMB-position
of about 40μm can be observed.