The bearingless switched reluctance motor system based on active disturbance rejection control has good anti-interference performance and robustness, but it is easy to lose stability due to the influence of measurement noise in actual engineering. The main reason for the sensitivity of active disturbance rejection control to noise lies in the noise amplification of its extended state observer. To solve this problem, a novel reduced-order extended state observer based on predictive linear tracking differentiator is proposed. First, the general form of the observer is given, and then active disturbance rejection controller is designed based on suspension system of the hybrid excitation bearingless switched reluctance motor. The suspension force is used as the hysteresis loop to eliminate the estimation of the disturbance feedforward gain, and the stability of the control system is analyzed by Lyapunov equation. Finally, the simulation comparison is conducted through Matlab. The results show that this method can effectively suppress the influence of measurement noise and reduce the error of disturbance estimation when the observer is in a low bandwidth.
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