关键词: 锁相环, 速度观测, 自抗扰控制器

Abstract:

Phase-locked loop(PLL) was used as the speed observer of the permanent magnet synchronous motor(PMSM).It can effectively solve the problem of phase lag when the servo motor speed was measured by the position difference method. Meanwhile,the phase-locked loop was combined with the auto-disturbance-rejection control(ADRC),and the speed signal observed by the phase-locked loop was used as the feedback of the speed-loop.The linear auto-disturbance rejection controller was used to design the speed and current loops of the PMSM control system.The load was used as the external disturbance,and the coupling term of the d-q axis and the power fluctuation were used as the internal disturbance.This method can estimate the total disturbance and then compensate it.The results of simulation and experiments demonstrate that speed was estimated precisely,the dynamic performance was improved, and the capability of disturbance rejection was satisfied.

Key words: phase-locked loop(PLL), speed observation, auto-disturbance-rejection control(ADRC)