Dynamic Response of Magnetically Suspended Rotor under Base Motions

Active magnetic bearings (AMBs) can provide no-friction support and active vibration control for rotating machinery. The magnetically suspended rotor will inevitably be excited by the base motions when working on the moving carrier, causing the rotor vibration, and even instability. The main purpose of this study is to investigate the vibration response of the magnetically suspended rotor under base motions, especially base rotation, and to evaluate the accuracy of the model. In this work, the model of the magnetically suspended rotor is established, considering the base motions, the closed-loop control system of AMBs and gravity. The vibration response of the magnetically suspended rotor is tested on an AMB-rotor test rig mounted on a 6-DOF robot. Under three different base motion forms, the numerical simulation results based on the model are close to the experimental results, verifying the accuracy of the model. This work can provide guidance for predicting the vibration response of the magnetically suspended rotor under base motions.