A single position loop control strategy for high-speed voice coil motor based on active disturbance rejection control

To improve the dynamic performance of voice coil motor, a single position loop control method based on active disturbance rejection control is proposed in this paper. The feedback law is sufficiently analyzed and well designed considering both sinusoidal input and step reference input. Moreover, stability analysis is conducted on the basis of a state-space model and Routh-Hurwitz criterion, which is proved to be stable and convergent under proper parameter arrangement. Further, simulation and experimental validation indicate that the proposed control strategy has faster step response and better tracking accuracy compared with traditional three-loop PI controller with only one eighth of settling time and less than half of the tracking error compared to PI controller.