Vibration Compensator for Magnetically Suspended Rotors

To achieve unbalance displacement compensation for magnetically suspended rotors (MSRs), an adaptive feed-forward signal amplifier (AFSA) is employed in this paper based on the basic principles of the traditional generalized notch filter (GNF). The open-loop signal amplifier (OSA) is the core of the GNF, and the AFSA stems from the OSA and can provide infinite stiffness at its central frequency without distortions beyond its bandwidth. Through the AFSA, the unbalance displacements will converge to zero, which is proven theoretically by a single frequency analysis method (SFAM). The stability of the system with the AFSA is analyzed by using classical frequency domain method. The correctness and effectiveness are demonstrated by a numerical simulation. The experiments conducted show that the unbalanced displacements of a magnetically suspended flywheel were reduced by about 90%.