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    QZB自耦變壓器

    2014/4/3 8:27:06      點(diǎn)擊:

    QZB自耦變壓器降壓起動(dòng)自耦變壓器|QZB起動(dòng)自耦變壓器,在自耦變壓器降壓起動(dòng)的控制線路中,限制電動(dòng)機(jī)起動(dòng)電流
    是依靠自耦變壓器的降壓作用來實(shí)現(xiàn)的。自耦變壓器的初級(jí)和電源相接,自耦變壓器的次級(jí)與電動(dòng)機(jī)相聯(lián)。
    自耦變壓器的次級(jí)一般有3個(gè)抽頭,可得到3種數(shù)值不等的電壓。使用時(shí),可根據(jù)起動(dòng)電流和起動(dòng)轉(zhuǎn)矩的要求
    靈活選擇。電動(dòng)機(jī)起動(dòng)時(shí),定子繞組得到的電壓是自耦變壓器的二次電壓,一旦起動(dòng)完畢,自耦變壓器便被
    切除,電動(dòng)機(jī)直接接至電源,即得到自耦變壓器的一次電壓,電動(dòng)機(jī)進(jìn)入全電壓運(yùn)行。通常稱這種自耦變壓
    器為起動(dòng)補(bǔ)償器。這一線路的設(shè)計(jì)思想和串電阻起動(dòng)線路基本相同,都是按時(shí)間原則來完成電動(dòng)機(jī)起動(dòng)過程
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