IC693CBL304

異步電動(dòng)機(jī)在社會(huì)的各個(gè)領(lǐng)域有著廣泛的應(yīng)用，各個(gè)行業(yè)如工業(yè)、農(nóng)業(yè)、交通運(yùn)輸業(yè)，都少不了異步電動(dòng)機(jī)，可見(jiàn)它在日常生活中對(duì)人們的重要性。

電動(dòng)機(jī)的電壓和電流呈正比，所以要把電壓全加到定子上的話可以減輕啟動(dòng)電流過(guò)大的沖擊，這就是降壓?jiǎn)?dòng)。一般降壓?jiǎn)?dòng)的時(shí)候，在這樣的情況下，它們的數(shù)值都不會(huì)很高：就是啟動(dòng)電流和啟動(dòng)轉(zhuǎn)矩在電壓的情況下，一同增加，一同減小。像這樣的情況，更適合需求啟動(dòng)電流和啟動(dòng)轉(zhuǎn)矩都不高的場(chǎng)合。

為了更加便利，可以采用這樣的辦法：在電機(jī)啟動(dòng)時(shí)，為了避免造成諧波過(guò)大，首先可以采用星型連接的方式，在啟動(dòng)完成后把電路連接方式轉(zhuǎn)換成三角形連接。異步電動(dòng)機(jī)啟動(dòng)時(shí)要注意：?jiǎn)?dòng)需要的設(shè)備不要復(fù)雜，要簡(jiǎn)單，操作要方便；電動(dòng)機(jī)要有特別大的啟動(dòng)轉(zhuǎn)矩；啟動(dòng)轉(zhuǎn)矩相同的情況下，啟動(dòng)電流小的越適合人們應(yīng)用，功率損耗越小的越受到廣泛應(yīng)用。轉(zhuǎn)矩和啟動(dòng)電流是電機(jī)啟動(dòng)時(shí)的兩個(gè)重要參數(shù)，要兼顧這兩個(gè)方面來(lái)控制電動(dòng)機(jī)的啟動(dòng)。

三相異步電動(dòng)機(jī)的電機(jī)的磁場(chǎng)與靜止轉(zhuǎn)子相對(duì)運(yùn)動(dòng)后，轉(zhuǎn)子的電流和感應(yīng)電動(dòng)勢(shì)在變大，定子也是如此。但是，過(guò)大的啟動(dòng)電流會(huì)導(dǎo)致電壓下降，電壓下降過(guò)大會(huì)直接影響電網(wǎng)電力設(shè)備的運(yùn)行。如果電壓降低，會(huì)使啟動(dòng)轉(zhuǎn)矩?zé)o法達(dá)到需要的轉(zhuǎn)矩，即使啟動(dòng)時(shí)間再長(zhǎng)也會(huì)失敗。因而，使用大型變壓器的場(chǎng)所，小容量的三相異步電機(jī)方便啟動(dòng)。

IC693CBL304 

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