直流电动机工作电源装置的液压系统中的工程机械，主要是配合液压泵。
DC motors work as power device of the hydraulic system in the project machinery, mainly matched with hydraulic pump.
液压泵作为液压传动中的一个重要动力装置，在当今工业社会有着相当大的需求量。
Summary The hydraulic pump has sizable demand in nowadays industrial society as an important motive equipment in hydraulic transmission.
由于传统的控制装置不能直接和计算机控制系统集成，限制了变量液压泵在许多领域的应用。
As the traditional control devices can not directly control by computer system, limiting the variable hydraulic pump in many areas of application.
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