Adaptive suppression of the gyroscopic effect of rigid asymmetric magnetically suspended high-speed rotor with large inertia

A dynamic model for rigid asymmetric rotors was established for investigating the vortex mode instability of a high speed unilateral rigid rotor with large inertia under rigid asymmetric magnetic suspensions. Meanwhile, a speed-adaptive multi-channel unilateral filtering PIDC control method was presented, which can compensate the phase of the instability of vortex motion at the end away from the rotor centroid by switching over feedback channels automatically for different rotational speed to optimize the preset parameters. The simulation results show that this easily-used method of PIDC control can effectively resolve the instability of precession and nutation modes at one end of the rotor which is caused by gyroscopic effect of the rotor at high speed. Experiments verify the reliability of the method: the prototype of a molecular pump can smoothly achieve the design specification of vacuum performance, when the speed is increased to 21 000 r/min.