通过测量两相电流，即可利用KCL 计算出第三相电流，请问二分流和三分流在运算过程中有哪些差别？
二分流在PWM接近100%占空比时导致观察时间过短，请问在哪些情况下PWM会达到100%占空比？
另外二分流可以选任意两相的电流吗？或者必须是A B两相电流？
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