它们是基于预测瞬时电流的PWM控制。
They are based on a predictive instantaneous current PWM control.
静态开关的大小来清除最短路和瞬时电流峰值。
The static switch is sized to clear most short-circuits and transient current spikes.
通过讨论瞬时电流的变化规律，提出控制瞬时电流的基本思路。
After studying the law of variation for transient current, the author brings out the basic thought for its control.
我们发现噪声可以破坏瞬时电流的周期性并削减长时平均电流的峰值。
We find that external noise can destroy the periodicity of the transient current and cancel the long-time average current peaks.
在变速参数中影响电机瞬时电流波动最为显著的因素依次为变速波形、变速幅度和变速频率。
The significant factors which exert an influence on instantaneous fluctuation of motor current are in sequence :Vari-speed wave form, vari-speed amplitude and vari-speed frequency.
文章阐述了斩波调速原理，指出峰值电流的大小会影响元器件的寿命，所以有必要对瞬时电流的大小进行控制。
It is pointed out, while expounding the principle of chopper speed variation, that the value of peak current can affect the service life of components and so it is necessary to control.
在该控制系统中实施了基于瞬时无功理论的瞬时功率和瞬时电流的检测算法以及一种开闭环相结合的复合控制策略。
The instantaneous reactive power theory is widely used in the detections of harmonic and reactive current in three-phase active power filter.
理论分析和试验结果表明，采用变速切削加工时，电机瞬时电流确有一定程度的波动，但不影响机床电机的正常使用；
The theoretical analysis and experimental results demonstrate that the motor current has some fluctuation in vari-speed cutting process, but it is almost no effect on normal operation of machine tool.
理论分析和试验结果表明，采用变速切削加工时，电机瞬时电流确有一定程度的波动，但不影响机床电机的正常使用；
The theoretical analysis and experimental results demonstrate that the motor current has some fluctuation in vari-speed cutting process, but it is almost no effect on normal operation of machine tool.
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