共集-共基组合放大电路具有良好的宽带放大特性，既可以作为缓冲级又能够提供一定的电压和电流增益。
The CC-CE combined amplifier has the nicer wide band magnifiable characteristic qua the buffer and gives some gains in voltage and electric current.
介绍了普通反时限特性，并提供了缺乏反时限特性段或电压互感器断线时的电流、时间整定原则。
The general inverse time characteristic is introduced, and the setting principles of current and time when inverse time characteristic is scarce or voltage transformer breaks are provided.
最后在系统实验基础上，给出了PWM波形、驱动波形、在一定转速下的相绕组电流波形以及系统的动态特性，步卜作一了分析。
PWM waves of DSP , drive waves , the current waves of each phase in a speed and curve of speed trait are given and analyzed at the end of article.
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