激励电流控制电路产生激励线圈的脉冲电流，并对脉冲电流进行调频和调幅控制。

The exciting current control circuit also can modulate frequency and modulate amplitude for the pulsed current.

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系统采用自动增益控制电路，并运用DDS技术实现调频、调幅，ASK、PSK等功能。

The system adopts AGC circuit, uses DDS technology to realize such functions as frequency modulation, amplitude modulation, ASK, PSK, etc.

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讨论具有大惯量飞轮负载的直流无刷、定于无铁芯电机，在脉宽调制调幅有源控制的基础上，完成再生能耗制动控制以及低速下转换到有源制动控制的主要技术问题。

The braking mode control of reviving power-consumption of large momentum fly-wheel motor is discussed on the basis of pulse-modulated amplitude-modulation in this paper.

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