分析了数控抽油机的运动规律及电力拖动系统，论述了变频调速技术在系统中的应用。应用可编程控制器(PLC)完成抽油系统的自动控制。
The movement law and electric driving system are analyzed. Variable frequency technique used in the system is discussed and PLC is used for automatic control of the pumping unit.
数控机床的转速调整，目前越来越多地应用了变压变频技术来实现。
NC machine speed adjustment, and more and more application of the VVVF technology to achieve.
数控机床的转速调整，目前越来越多地应用了变压变频技术来实现。
NC machine speed adjustment, and more and more application of the VVVF technology to achieve.
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