By using the special control algorithm of variable frequency drive system above said problem is solved.

设计了基于变频驱动系统的专用控制算法来解决“倒发电”问题.

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The history of top drive drilling system from direct current drive to variable - frequency drive is introduced.

简述了国外钻机顶部驱动系统由直流顶驱逐步演变到变频顶驱的发展历史.

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An AC variable frequency drive system of paper machine with PLC controller is introduced.

介绍适用于造纸机的变频调速PLC控制系统.

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