This paper studied the three-phase PWM(pulse width modulation) rectifier in dual PWM variable frequency speed regulation system.

对双PWM变频调速系统中的三相PWM整流器及其控制方法进行了研究。

youdao

A dual variable-diameter wheel pumping unit, which has long stroke and low pumping speed and large load capacity, is designed based on conventional beam pumping units.

双变径轮式抽油机是在继承常规游梁式抽油机优点的基础上设计而成的大载荷、长冲程、低冲次节能型抽油机。

youdao

First this paper research on using variable speed fluid couplings in speed regulation control system of dual pumps or fans machines running in parallel mode.

本文首先对调速型液力偶合器应用于泵或风机双机并联运行的调速控制系统进行研究。

youdao