選(xuan)用(yong)(yong)船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)(ya)馬達(da)(da)通常(chang)是(shi)根據馬達(da)(da)的(de)(de)扭矩(ju)、轉速、安裝尺(chi)寸和液(ye)壓(ya)(ya)(ya)系(xi)統的(de)(de)大工(gong)作(zuo)(zuo)壓(ya)(ya)(ya)力等(deng)參(can)數決定的(de)(de)。由于船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)(ya)馬達(da)(da)在系(xi)統中屬于執行元件, 因(yin)此(ci)往往是(shi)帶負(fu)載(zai)起(qi)動(dong)(dong), 即在負(fu)載(zai)扭矩(ju)大狀態(tai)下起(qi)動(dong)(dong)。而船(chuan)舶機(ji)(ji)械大多是(shi)大功率負(fu)載(zai), 如果船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)(ya)馬達(da)(da)沒有足夠(gou)大的(de)(de)起(qi)動(dong)(dong)力矩(ju)是(shi)無法正常(chang)工(gong)作(zuo)(zuo)的(de)(de)。并且, 為了縮小系(xi)統體積(ji), 提高系(xi)統工(gong)作(zuo)(zuo)可(ke)靠(kao)度, 船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)(ya)馬達(da)(da)經(jing)常(chang)與低速工(gong)作(zuo)(zuo)機(ji)(ji)構直(zhi)接連接, 因(yin)此(ci)船(chuan)用(yong)(yong)液(ye)壓(ya)(ya)(ya)馬達(da)(da)要(yao)求(qiu)具有大的(de)(de)起(qi)動(dong)(dong)扭矩(ju)、很寬的(de)(de)速度范圍和良好的(de)(de)低速穩定性。
液(ye)(ye)(ye)壓(ya)系(xi)統(tong)(tong)主(zhu)要的參數(shu)是壓(ya)力(li)和流(liu)(liu)量。當根據負(fu)載情況基本確定(ding)了船用(yong)(yong)液(ye)(ye)(ye)壓(ya)馬(ma)達的大阻力(li)矩, 并知道(dao)了船用(yong)(yong)液(ye)(ye)(ye)壓(ya)馬(ma)達和液(ye)(ye)(ye)壓(ya)缸要求的工(gong)作速(su)度范圍, 就可估算系(xi)統(tong)(tong)所需的工(gong)作壓(ya)力(li)和工(gong)作流(liu)(liu)量, 為(wei)制(zhi)定(ding)液(ye)(ye)(ye)壓(ya)系(xi)統(tong)(tong)方案提(ti)供(gong)確切的依據。因此, 正確選擇(ze)船用(yong)(yong)液(ye)(ye)(ye)壓(ya)馬(ma)達對制(zhi)定(ding)合理的液(ye)(ye)(ye)壓(ya)系(xi)統(tong)(tong)方案是一項至關(guan)重要的工(gong)作。