摘要：针对永磁同步电机的电压空间矢量控制至少需要两个电流传感器的问题，介绍了两种基于母线电流传感器的三相电流重构方法。在分析SVPWM周期内采样法存在非可测量区域的基础上，介绍了通过采样及扇区保持的方法对母线电流采样进行修改的策略，该策略在扇区切换附近也可以很好地构造三相电流。SVPWM周期外采样法虽然在实际电流中引入了高频谐波，但可以时刻得到准确的三相电流值，且引入的三个采样矢量的合成矢量为零，不会对实际电压参考矢量造成任何影响。仿真结果验证了理论分析的正确性。

关键词：母线电流传感器；电流重构；电压空间矢量；交流永磁电机
Abstract: It required at least two current sensors for the permanent magnet synchronous motor voltage space vector control. According to the problem, two kinds of threephase current reconstruction method based on the dclink current sensor were proposed. Based on the analysis of the nonmeasurable area in the sampling method within the SVPWM cycle, a maintained by the sector to be modified on the bus current sampling method had been proposed, which was near in the sector switch can also be constructed of threephase current. Although the sampling method outside the SVPWM cycle introduced highfrequency harmonics in the actual current, it can always obtain the accurate threephase current value, and the introduction of the three sampling synthetic vector of the vector was zero, did not cause any impact on the actual voltage of the reference vector. The simulation results verify the correctness of theoretical analysis.

Key words: DClink current sensor；current reconstruction；voltage space vector；permanent magnet AC moto