不推薦使用低電壓操作數(shù)的返回來(lái)作為差動(dòng)元件的閉鎖輸入。差動(dòng)元件包括飽和檢測(cè)器，飽和檢測(cè)器對(duì)差動(dòng)電流和制動(dòng)電流之間一定的時(shí)間關(guān)系做出反應(yīng)，因此，為了合適地運(yùn)行它必須時(shí)總是處于運(yùn)行狀態(tài)。這個(gè)元件可以用來(lái)給出–個(gè)需要的時(shí)間延時(shí)動(dòng)作特性,

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