工作原理，当压力油经固定的配油轴4的窗口进入缸体内柱塞的底部时，柱塞向外伸出，紧紧顶住定子的内壁，由于定子与缸体存在一偏心距。在柱塞与定子接触处，定子对柱塞的反作用力为 。力可分解为和 两个分力。当作用在柱塞底部的油液压力为p，柱塞直径为d，力和之间的夹角为X时，力对缸体产生一转矩，使缸体旋转。缸体再通过端面连接的传动轴向外输出转矩和转速。以析的一个柱塞产生转矩的情况，由于在压油区作用有好几个柱塞，在这些柱塞上所产生的转矩都使缸体旋转，并输出转矩。径向柱塞液压马达多用于低速大转矩的情况下。
从能量转换的观点来看，液压泵与液压马达是可逆工作的液压元件，向任何一种液压泵输入工作液体，都可使其变成液压马达工况;反之，当液压马达的主轴由外力矩驱动旋转时，也可变为液压泵工况。因为它们具有同样的基本结构要素--密闭而又可以周期变化的容积和相应的配油机构。卡桑尼马达MR4500L-F1Q2N1N1NX0600/58081
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折叠高速马达
额定转速高于500r/min的马达属于高速马达。高速马达的基本形式有齿轮式、叶片式和轴向柱塞式。它们主要特点是转速高，转动惯量小，便于启动、制动、调速和换向。

折叠低速马达
转速低于500r/min的液压马达属于低速液压马达。它的基本形式是径向柱塞式。低速液压马达的主要特点是:排量大，体积大，转速低，可以直接与工作机构连接，不需要减速装置，使传动机构大大简化，低速液压马达的输出扭矩较大，可达几千到几万Nm，因此又称为低速大扭矩液压马达。

液压马达亦称为油马达，主要应用于注塑机械、船舶、起扬机、工程机械、建筑机械、煤矿机械、矿山机械、冶金机械、船舶机械、石油化工、港口机械等。高速马达齿轮马达具有体积小、重量轻、结构简单、工艺性好、对油液的污染不敏感、耐冲击和惯性小等优点。缺点有扭矩脉动较大、效率较低、起动扭矩较小(仅为额定扭矩的60%--70%)和低速稳定性差等。
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