采用检测信号并考虑主磁链饱和的异步电机无传感器矢量控制

Sensorless Field Oriented Control of Induction Motors Using Test Signals and Considering Main Flux Saturation

异步电机无速度传感器矢量控制需要通过由定子电压和电流建立的模型来计算磁链矢量和转速。如果磁链矢量的估计中存在误差,例如由电机模型参数不准确造成的误差,那么系统的稳定性就会出现问题。本文提出了一种考虑了主磁链饱和效应的方法来辨识磁链矢量甚至是在定子频率为零时的磁链。因此保证了全速和全转矩范围内的系统的稳定运行。

The field oriented control of induction motor drives without speed sensor requires the calculation of the flux vector and the speed by a model from stator voltages and currents. In case of faulty estimation of the flux vector, e.g. due to incorrect model parameters, the stability of the system is at risk. A new method is proposed considering main flux saturation to identify the flux vector even down to zero hertz stator frequency. Thus stable operation in the entire torquespeed-plane is ensured.