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原理：指令信號(hào)經(jīng)比例放大器進(jìn)行功率放大，并按比例輸出電流給比例閥的比例電磁鐵，比例電磁鐵輸出力并按比例移動(dòng)閥芯的位置，即可按比例控制液流的流量和改變液流的方向，從而實(shí)現(xiàn)對(duì)執(zhí)行機(jī)構(gòu)的位置或速度控制。在某些對(duì)位置或速度精度要求較高的應(yīng)用場(chǎng)合，還可通過對(duì)執(zhí)行機(jī)構(gòu)的位移或速度檢測(cè)，構(gòu)成閉環(huán)控制系統(tǒng)

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