The advantages offered by active magnetic bearings make that bearing widely used in high-speed Fluid Machinery, the applications that use active magnetic bearing must be equipped with touchdown (auxiliary) bearing system to prevent the damages of impellers and motor in case of a system failure. When the drop event occurs, active magnetic bearing cannot support the rotor stably, touchdown bearings will be a backup for active magnetic bearings to support the rotor during drop down event. Therefore, the properly designed touchdown bearing system is necessary to protect the active magnetic bearings assembly and other critical machine components from direct contact with the rotor during in a loss of AMB power events. This study has based on the un-lubricated Hertzian contact model to analyze the rotor drop dynamics, and the Finite Element method is used to create the flexible rotor model. Finally, the simulation results of this study will show the rotor orbit, rotor response and contact force under rotor drop events by using MATLAB software.
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