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.
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。
Utilizing the present mutual conversion technique, the electric control system of an air compressor is modified and improved, and then the analysis on its application effects is carried out.
利用现有的比较成熟的变频技术对空压机电控系统进行改造，并对应用效果进行了分析。
The system adopts an upper - lower structure and touch screen technique. A great development in electric control theory of the vacuum - forming machine is made.
该系统采用上下位机形式的结构以及触摸屏技术，实现了真空成型机电气控制技术的新突破。
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