本文介绍了相量变换原理及其在正弦电路功率分析中的应用。

The phasor transformation and its applications in the AC power analysis are introduced in this paper.

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表明了在电路功率问题上，路的关系式也可以从场方程式导出，路的关系式是场方程式的特殊情形。

Refering the electrocircuit power, the electrocircuit formula can be derived from the electromagnetic field equation, and it's a special case of the latter.

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该变频调速系统主电路采用交-直-交形式，以(CPLD)作为调速系统逆变电路功率开关器件(IPM)的逻辑控制器件。

The AC-DCAC voltage source inverter composes the main circuit of this variable frequency system and CPLD is the logic control device of the power device (IPM).

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