介绍一种用计算机控制的交流电动机变频调速系统 SPWM序列的一种新算法 ,该算法改进了规则采样法 ,并对改进算法后的精度进行了分析。采用 Visual Basic语言编制的新算法与采用正弦波对应的等效面积的相对误差相比 ,要比规则采样法减小一半 ,而且提高了计算精度。在双极性方式下作同样分析 ,计算结果也十分相近 A new algorithm of computer controlled SPWM sequence of AC motor speed control system is introduced, which improves the regular sampling method and analyzes the accuracy of the improved algorithm. Compared with the relative error of the equivalent area of ​​the corresponding sine wave, the new algorithm using Visual Basic language is reduced by half compared with the regular sampling method, and the calculation accuracy is improved. In bipolar mode for the same analysis, the calculation results are also very similar