This method regulates speed by changing the number of steps of the additional resistor in the rotor circuit, so it's hard to realize smooth speed-regulation, also its performance is poor.
该方法是通过调节转子回路附加电阻的有级调速，难以实现平滑地调速，而且调节性能差，调速过程中大量的转差功率通过转子回路电阻转化为热能消耗掉了。
To produce the smooth waveform with the stable frequency, this paper presents a design method of sine signal generator's function circuit which is based on the DDS theory.
为了能够方便地产生波形平滑、频率稳定的正弦信号波形，提出了一种基于DDS技术的正弦信号发生器的设计方法。
The arc striking circuit with low current and mathematic model is developed and used, the smooth arc striking has been achieved successfully.
在该逆变器中设置了小电流引弧电路，建立了数学模型，成功地实现了引弧电流软启动。
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