Design of magnetically suspended elastic rotor notch filter based on two-frequency Bode diagram

An illustrative and robust method based on two-frequency Bode diagram is presented to design NF (Notch Filter) parameters. By introducing two-frequency Bode diagram, the stability of elastic mode for a rotor is analyzed to obtain the correction angle requirements of bending mode at various rotor speeds, and NF parameters including the grade, center frequency and the pole damping are designed optimally to minimize influence on nutation stability. By employing the optimized notch filter, the elastic vibration amplitude of statically suspended rotor in magnetically suspended Control Moment Gyroscope (MSCMG) is attenuated significantly and the rotor is robustly stabilized within entire speed range up to 20000 r/min. The experimental results prove the practicalness and effectiveness of proposed method.