Abstract:In order to reduce the volume, weight and launch cost of magnetic bearing flywheel as a whole, a repeatable inner locking device based on conical surface to lock and friction selflocking to keep locking was presented. Its composition and operating principle were introduced. According to launch vibration condition, the static analysis of locking device was carried out and the locking parameters were obtained. Upon this basis, by choosing locking step position and conical constraint area, the dynamics modals of flywheel rotor under locking state were calculated by finite element method (FEM). According to design results, a locking device was developed, and vibration working condition of satellite launching was simulated by sweptsine vibration and random vibration, so as to verify the protection effects on the magnetic bearing flywheel by the locking device. The result shows that, no resonance occurs during testing of the flywheel, and the maximum relative vibration displacement between stator and rotor is at 30 μm far less than the protection gap of 200 μm, which indicates the locking device can effectively protect flywheel system.