In the light of the pickup current of a submersible electric pump being too large when started at full pressure, a new variable frequency control system is developed.

针对电动潜油泵工频全压启动时存在启动电流过大等诸多问题，开发出新型电动潜油泵变频控制系统。

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A kind of medium voltage AC variable frequency control system, which consists of voltage source inverter, sinuous filter and stepup transformer with variable frequency, is introduced.

介绍一种采用低压电压型变频器、正弦波滤波器和变频升压变压器构成的低-高式中压变频控制系统。

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Physical features and frequency of water temperature control system with variable parameter are analyzed.

本文分析了变参数水温控制系统的物理特性及频率特性。

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