基于位置估计的永磁同步电机全速域控制

Position estimation based sensorless control for permanent magnet synchronous motor in full speed range

为改进全速域内永磁同步电机(Permanent magnet synchronous motor,PMSM)转子速度估计精度,该文提出高频信号注入和自适应结合法来估计电机位置和速度,实现全速域内无传感器PMSM的控制。首先在特定高频信号激励下,利用电流响应估计PMSM的初始位置,同时通过流频法启动并控制电机低速运行。然后提出基于可调模型的自适应法估计中高速运行时的电机转速,实现电机无传感器条件下的精确控制。结果表明:提出的方法能使转子初始位置估计误差在0.3%以内和转速估计误差在0.7%以内,转速误差被控制在0.4%以内,具有良好的估计精度与稳态性能。

In order to improve poor estimating accuracy and long convergence time to affect its stability in the full speed range for a permanent magnet synchronous motor,a sensorless control technology combing high frequency signal injection and adaptive estimation is proposed in this paper.The rotor position and its speed is detected by using a high frequency signal injection method,and the motor is started and controlled by the current-frequency method in a low speed range.The adjustable model based adaptive method is presented to estimate the rotor speed and its control is realized in a high speed range.The estimation error of the rotor initial position is less than 0.3%and that of the rotor speed is 0.7%.Also,the speed error of the motor is less than 0.4%.It shows that the estimating accuracy and steady performance can be guaranteed by using the presented method.