基于电流闭环的PMSM无速度传感器控制

Sensorless Control of PMSM Based on Current Closed-loop Observer

在永磁同步电机(PMSM)的无速度传感器控制中,速度与角度估算的准确性将直接影响控制性能。状态观测器具有结构简单、噪音少的特点。在此提出一种基于矢量控制的电流闭环观测器PMSM无速度传感器方案,该方案依据PMSM在静止坐标系下的数学模型,从同步电机的电磁转矩与角速度的关系出发,结合控制理论,实现对速度和角度的估算。仿真和实验验证结果表明所提方案能准确地估测到转子的位置和速度,且具有良好的动、静态运行性能。

For sensorless control of the permanent magnet synchronous motor(PMSM),the estimated accuracy of the angular velocity and position angle will directly affect control performance.As state observer has the advantages of simple structure and low noise,a novel sensorless control method on the basis of the current closed-loop state observer is proposed.The method is based on mathematic deducing of relationship between the electromagnetic torque and the angular velocity in accordance with the PMSM's mathematic model and the control theory.A system simulation model and experimental platform are set up,simulation and experimental results verify the effectiveness and validity of the proposed sensorless control method,and the observer can work well in dynamic response process.