Improvement of high-speed stability of an aerostatic bearing-rotor system using an active magnetic bearing

摘要

This paper presents an improvement of the high-speed stability of an aerostatic bearing (ASB) rotor system with an active magnetic bearing (AMB). The AMB can effectively extend the operating range of the ASB-rotor system by adjusting its stiffness and damping through active feedback control. An experimental setup has been built for a rotor supported by both ASB and AMB. Through experiment, we first demonstrated that the fluid induced instability of the rotor bearing system occurs at around 27,000rpm, which conforms to our theoretical analysis. After that, we verified that the AMB can be used to suppress the fluid induced instability of the ASB-rotor system, and to extend its operating speed up to 35,000 rpm.