关键词: 永磁同步电机, 位置及转速估计, 扩张状态观测器, 滑模观测器, 锁相环技术, 反电动势观测器

Abstract:

For the permanent magnet synchronous motor(PMSM)sensorless control system, a new type of rotor position and speed observer based on the extended state observer (ESO) was designed.ESO can accurately estimate disturbances in the auto-disturbance rejection control.The back-electromotive force(EMF) term which contains rotor position and speed information was regarded as a disturbance, and the current and voltage signals were taken as states and inputs respectively, back EMF was estimated.Considering that the estimated back EMF contains harmonics and high-frequency noise,the phase-locked loop (PLL) was designed to calculate the rotor position and velocity information from the back EMF.An experimental platform was built. Compared with the commonly used sliding mode observer(SMO), the effectiveness of the introduced method was verified by simulations and experiments.

Key words: permanent magnet synchronous motor(PMSM), position and speed estimation, extended state observer(ESO), sliding mode observer (SMO), phase-locked loop(PLL), back-EMF observer