它产生低频段的高振幅。
It leads to higher harmonics amplitudes in lower frequency range.
普通的孔板会引起持续的涡流，产生低频。
The common bore plank will cause to keep on of the Votex flow, creation low frequency.
分析了步进电机产生低频振荡的原因，提出了一种新控制方法—脉宽调整法。
The way of pulse-width adjustment which can change the size, the direction and the action time of the electromagnetic resultant force in the stepping motor.
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