當(dāng)整塊鐵磁金屬或者其它導(dǎo)磁物質(zhì)與之靠近的時候，發(fā)生動作，開通或者閉合電路。由永久磁鐵和干簧管組成。永久磁鐵、干簧管固定在一個不導(dǎo)磁也不帶有磁性的支架上。以永久磁鐵的南北極的連線為軸線，這個軸線應(yīng)該與干簧管的軸線重合或者基本重合。由遠(yuǎn)及近的調(diào)整永久磁鐵與干簧管之間的距離，當(dāng)干簧管剛好發(fā)生動作（對于常開的干簧管，變?yōu)殚]合；對于常閉的干簧管，變?yōu)閿嚅_）時，將磁鐵的位置固定下來。這時，當(dāng)有整塊導(dǎo)磁材料，例如鐵板同時靠近磁鐵和干簧管時，干簧管會再次發(fā)生動作，恢復(fù)到?jīng)]有磁場作用時的狀態(tài)；當(dāng)該鐵板離開時，干簧管即發(fā)生相反方向的動作。磁簧繼電器結(jié)構(gòu)堅固，觸點(diǎn)為密封狀態(tài)，耐用性高，可以作為機(jī)械設(shè)備的位置限制開關(guān)，也可以用以探測鐵制門、窗等是否在指定位置。

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