主令控制器（又稱主令開(kāi)關(guān)），主要用于電氣傳動(dòng)裝置中，按一定順序分合觸頭，達(dá)到發(fā)布命令或其它控制線路聯(lián)鎖、轉(zhuǎn)換的目的。適用于頻繁對(duì)電路進(jìn)行接通和切斷，常配合磁力起動(dòng)器對(duì)繞線式異步電動(dòng)機(jī)的起動(dòng)、制動(dòng)、調(diào)速及換向?qū)嵭羞h(yuǎn)距離控制，廣泛用于各類起重機(jī)械的拖動(dòng)電動(dòng)機(jī)的控制系統(tǒng)中。主令控制器一般由觸頭系統(tǒng)、操作機(jī)構(gòu)、轉(zhuǎn)軸、齒輪減速機(jī)構(gòu)、凸輪、外殼等幾部分組成。

按其結(jié)構(gòu)型式（凸輪能否調(diào)節(jié)）可分為兩類：一類是凸輪可調(diào)式主令控制器；一類是凸輪固定式主令控制器。前者的凸輪片上開(kāi)有小孔和槽，使之能根據(jù)規(guī)定的觸頭關(guān)合圖進(jìn)行調(diào)整；后者的凸輪只能根據(jù)規(guī)定的觸頭關(guān)合圖進(jìn)行適當(dāng)?shù)呐帕信c組合。

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