内置式永磁同步电机低速无位置传感器控制

Low-speed position sensorless control of IPMSM based on high frequency signal injection

针对内置式永磁同步电机低速无位置传感器控制相关问题,在分析内置式永磁同步电机动态数学模型的基础上,提出了一种基于高频信号注入法的转子位置估计方法。通过向电机的控制电压中叠加一个三相对称高频电压信号,对三相电流响应信号进行带通滤波,得到高频电流分量,利用最小二乘算法提取三相高频电流响应的幅值大小,并经过特定算法提取出转子位置。该算法运算量小,估计误差低,易于实现,对电机参数变化不敏感,鲁棒性强,对一台内置式永磁同步电机无位置运行的实验结果表明转子位置提取算法的有效性,根据工作状态的不同,检测误差会有所不同,但误差限都控制在"6°(电角度)以内,平均检测误差都小于3°(电角度)。

On the basis of analyzing the mathematic model of the interior permanent magnet synchronous machine,a novel rotor position estimation scheme based on high-frequency injection( HFI) was proposed,which meets the need of low-speed sensorless control of IPMSM. In the proposed method,a threephase symmetrical high-frequency voltage signal was superimposed in the control voltage first,then the high-frequency current component was obtained by band-pass filtering of the three-phase current signal,the amplitude of the three-phase high-frequency current response was extracted by least square algorithm,and finally the rotor position was obtained. The mathematical processing algorithm operation is small and the algorithm is easy to implement,the estimation error is small,and robustness is strong. The experimental results show that the proposed estimation method for rotor position is correct. The error limits are controlled within 6°( in electrical degree),and the average detection error is less than 3°( in electrical degree),which brings a practical value in engineering.