对电势零点的选取问题进行了分析，重点论述了电势零点如何选取及所限定的条件。
The problem of choice of zero point of electric potential is analyzed. concentrating on how to choose and the limited conditions.
通过静电学、低频交流、直流等电路实例，质疑了电势零点问题，并对此进行了澄清。
Through electrostatics and examples of low-frequency alternating current and direct-current circuit, the problem of zero potential point is queried and clarified.
最后讨论零点不同的电势如何进行叠加。
Eventually, it debates how to superpose the electric potential when the zero point is different.
本文采用虚拟中点的方法来识别反电势过零点，然后对过零点进行处理得到无刷电机换向的六个关键位置。
This paper USES "virtual neutral point method" to measure the "zero crossing", then the soft deal "zero crossing" to get the six key position to commutate.
本文采用虚拟中点的方法来识别反电势过零点，然后对过零点进行处理得到无刷电机换向的六个关键位置。
This paper USES "virtual neutral point method" to measure the "zero crossing", then the soft deal "zero crossing" to get the six key position to commutate.
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