在交流电路中，电流的幅度是连续不断地变化的，因此相位和时间的概念变得十分重要了。
In ac circuits, the current amplitude changes continuously that the concept of phase or time becomes very important.
谐波理论分析对于非正弦交流电路的研究具有重要的理论和实际意义。
The analysis of modulation wave theory has very important theoretical and actual meaning for studying non sine alternating current.
本文以发动机测试中一项重要的特性测试项目——速度特性测试为目的，重点研究了交流电力测功机及其控制系统设计。
Aiming at the speed characteristics test, which is one of important test items of engine test, this paper proposes studies of ac electrical dynamometer and its control system.
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