当要合成某一矢量时先将这一矢量分解到离它最近的两个基本矢量，而后用这两个基本矢量去表示，而每个基本矢量的作用大小就利用作用时间长短去代表。用电压矢量按照不同的时间比例去合成所需要的电压矢量。从而保证生成电压波形近似于正弦波。-When you want to when the first synthesis of a vector to the vector into the nearest two basic vector, and then use these two basic vectors to represent, and the role of each basic vector magnitude effect on the use of the length of time to represent. A voltage vector according to the different time scale to synthesize the required voltage vector. Thus guaranteed to produce approximately sinusoidal voltage waveform.