基于反电动势PLL法的PMSM无传感器控制研究

Research on the Sensorless Control of PMSM Based on Back Electromotive Force and Phase Locked Loop

为改善永磁同步电机(PMSM)无速度传感器低速系统的控制性能,介绍了一种反电动势和锁相环(PLL)法相结合的PMSM无速度传感器控制算法。首先利用检测得到的电压和电流进行数学建模,然后基于建立的数学模型对PMSM进行转子位置和转速估计,并采用PLL法进行转子位置跟踪,达到无速度传感器控制的目的。最后针对所提新型控制方法进行实验验证,结果验证了该估算方法能在PMSM较低速运行时准确的估算出转子位置和速度,无传感器矢量控制调速系统具有调速范围宽、鲁棒性强的特点,且该无传感矢量控制算法简单、易于实现。

In order to improve the speed sensorless-control system of permanent magnet synchronous motor （PMSM） in low speed performance, a novel control method is introduced about back EMF and phase locked loop （PLL） with a combination of speed sensorless control algorithm for PMSM.Firstly, mathematical modeling is made by detecting the resulting voltage and current, secondly based on the mathematical model estimate the PMSM rotor position and speed, using PLL method tracking rotor position and the purpose of speed sensorless control is achieved.Finally,the correctness of new control method is verified by experiment.The results verify that the estimation method can accurately estimate the rotor position and speed at very low speed.Speed sensorless vector control system has the characteristics of a wide speed range and robustness.Furthermore,the algorithm of the sensorless control is simple and easily achieved.