Aimed at the stability problem of magnetically suspended momentum wheel (MSMW) caused by gyroscopic effect, a criterion based on the frequency characteristic of control circuits is used to analysis and predict whirl modes stability of the flywheel system, and a proportional cross feedback control algorithm based on decentralized control is proposed to stabilize both precession and nutation. Particular simulation and experimental research on nutation stability shows that the phase lag of controller, especially the nonlinearity of amplifier caused by limited current rate is the main factor that influences the stability of nutation at high speed. A series of measurements and experiments are executed on a MSMW prototype under development at Beijing University of Aeronautics and Astronautics (BUAA). Results show good agreement between the analysis and the experiment. The maximum design speed 24,000 rpm is achieved through parameters adjusting.
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