電動(dòng)式 電動(dòng)式是指采用直流伺服電動(dòng)機(jī)作為電氣一機(jī)械轉(zhuǎn)換元件的比例閥，直流伺服電動(dòng)機(jī)將輸入的電信號(hào)．轉(zhuǎn)換成旋轉(zhuǎn)運(yùn)動(dòng)轉(zhuǎn)速，再經(jīng)絲桿螺母、齒輪齒條或齒輪凸輪等減速裝置和變換機(jī)構(gòu)，輸出力與位移，進(jìn)一步控制液壓參數(shù)

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