原理：指令信號經(jīng)比例放大器進行功率放大，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，從而實現(xiàn)對執(zhí)行機構(gòu)的位置或速度控制。在某些對位置或速度精度要求較高的應(yīng)用場合，還可通過對執(zhí)行機構(gòu)的位移或速度檢測，構(gòu)成閉環(huán)控制系統(tǒng)

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