Stability Analysis and Testing of the High-Speed Active Magnetic Bearing-Flywheel System in the Rotating Frame

The active magnetic bearing (AMB) can greatly improve the stability of the flywheel system and increase the maximum flywheel speed. However, if the frame of active magnetic bearing-flywheel system (AMB-FS) rotates in the different direction from the flywheel, the strong gyroscopic effect of high-speed flywheel will greatly affect the system stability. In this study, to realize the high stability of the AMB-FS at ultra-high flywheel speed with low power consumption, the main purpose and content are implementing active control to the strong gyroscopic effect caused by the rotating frame and suppressing the precession and nutation of the flywheel. Through the stability analysis, AMB controller design, simulation and dynamic experiment, the AMB-FS is designed and studied, and the system stability is analyzed in the experiment. In the experiment, the gyroscopic effect of the flywheel is effectively suppressed. In the vacuum environment, the flywheel can be suspended stably at any speed within the range of 0 to 30000rpm, and the AMB-FS has the power consumption of 17.82W and needs no cooling measures The flywheel speed could exceed 𝟑31200rpm and still possess the speeding potential. The ultimate performance test shows that the maximum frame rotational speed can reach 3.5deg/s at the rated flywheel speed of 30000rpm, and the AMB-FS shows high stability.