描述
逆時(shí)針和順時(shí)針，是要從什么方向來(lái)看，這只是看的方向的問(wèn)題，從這個(gè)方向是順時(shí)針從另外一個(gè)方向就是逆時(shí)針，沒(méi)有人規(guī)定電機(jī)總是順時(shí)針轉(zhuǎn)的，以三相異步電機(jī)為例，任何兩條相線接法顛倒了，電機(jī)會(huì)立馬反向，也就是原來(lái)所謂的順時(shí)針，會(huì)變成逆時(shí)針旋轉(zhuǎn)了。
對(duì)電機(jī)旋轉(zhuǎn)方向的術(shù)語(yǔ)是有國(guó)標(biāo)規(guī)定的，只稱(chēng)為順時(shí)針還是逆時(shí)針，但是沒(méi)有誰(shuí)規(guī)定電機(jī)一定要順時(shí)針轉(zhuǎn)。如果只有一個(gè)軸伸，或不同直徑的兩個(gè)軸伸，從軸伸端看（對(duì)兩個(gè)軸伸的看大直徑端）；如果有兩個(gè)相同直徑軸伸的，或者沒(méi)有軸伸，則從有換向器或滑環(huán)端看；如果一端有換向器而另一端有滑環(huán)，則從滑環(huán)端看。電動(dòng)機(jī)的轉(zhuǎn)向是順時(shí)針的稱(chēng)順時(shí)針旋轉(zhuǎn)，逆時(shí)針的稱(chēng)逆時(shí)針旋轉(zhuǎn)。
發(fā)動(dòng)機(jī)大都是順時(shí)針旋轉(zhuǎn)的，別把發(fā)動(dòng)機(jī)和電機(jī)混淆了，發(fā)動(dòng)機(jī)順時(shí)針轉(zhuǎn)的主要原因如下：按照傳動(dòng)系統(tǒng)的設(shè)計(jì)，面對(duì)風(fēng)扇當(dāng)發(fā)動(dòng)機(jī)順時(shí)針運(yùn)轉(zhuǎn)時(shí)，扭矩經(jīng)過(guò)變速箱，傳動(dòng)軸，驅(qū)動(dòng)橋，最終到達(dá)車(chē)輪上剛好是使前進(jìn)的方向。在發(fā)動(dòng)機(jī)剛開(kāi)始問(wèn)世的時(shí)候，起動(dòng)根本不是靠起動(dòng)機(jī)，一般都是靠人力起動(dòng)。一般人都習(xí)慣用右手，所以在設(shè)計(jì)發(fā)動(dòng)機(jī)的時(shí)候，考慮到人站在發(fā)動(dòng)機(jī)前面，使用右手方便，所以就設(shè)計(jì)成順時(shí)針?lè)较蛄?。大多?shù)發(fā)動(dòng)機(jī)都是如此，也有少數(shù)賽車(chē)或者航空發(fā)動(dòng)機(jī)是逆時(shí)針運(yùn)轉(zhuǎn)的，具體要看需要了。電機(jī)節(jié)能智能電機(jī)節(jié)電設(shè)備。
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