Disturbance Rejection for a Zero-bias Controlled Active Magnetic Bearing Based on Disturbance Observer and Notch Filter

摘要

This paper introduces a nonlineardisturbance observer plus general notch filter based zerobiascontrol strategy to handle disturbance and reducepower consumption for the radial magnetic bearing in themagnetically suspended spindle. The zero-bias control isused to decrease the power consumption of magneticbearings, as large power consumption causes temperaturerise of system and temperature drift of sensor. Thesuspension of the rotor is affected by complicateddisturbance including non-periodic and periodicdisturbance. In order to reduce the deviation of rotorbrought by external disturbance, the nonlinear disturbanceobserver is used. However, since the response lag to thedisturbance, the nonlinear disturbance observer cannotsuppress the periodic imbalance force well. Therefore,the general notch filter is introduced to reduce theperiodic vibration. The effectiveness on the disturbancesuppression and power reduction of the proposed methodis verified by experiment results.