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This paper discusses the influence of external interference on voice coil motor, establishes a mathematical model of voice coil motor, and proposes the state space equations of voice coil motor that meet the requirements of affine system. On this basis, three-closed-loop PID controller and active disturbance rejection controller are designed. Modelica simulation language is used in the MWorks software to simulate the modeling and controllers. The simulation results show that the active disturbance rejection controller can better adapt to interference and has better frequency response and control quality.