降壓起(qi)(qi)動(dong)(dong):采(cai)用降壓起(qi)(qi)動(dong)(dong)來減(jian)小起(qi)(qi)動(dong)(dong)電流,但會同時使(shi)電動(dong)(dong)機的起(qi)(qi)動(dong)(dong)轉矩減(jian)小,故只適用于對起(qi)(qi)動(dong)(dong)要求不高、空載(zai)或輕載(zai)的場(chang)合。
(1);起動(dong):實用于定子繞組Δ接法的電(dian)動(dong)機,設(she)備(bei)簡單(dan),可(ke)以(yi)頻(pin)繁(fan)起動(dong),應用較廣泛。
(2)定(ding)子回路串電(dian)阻(zu)降壓起(qi)(qi)動(dong):起(qi)(qi)動(dong)過程中把電(dian)阻(zu)短接,電(dian)阻(zu)損耗大,電(dian)阻(zu)容量(liang)限制起(qi)(qi)動(dong)次數不能頻繁,較少采(cai)用。
(3)自(zi)耦變(bian)壓器降壓啟動(dong):定子回路接(jie)入(ru)變(bian)壓器起(qi)動(dong),起(qi)動(dong)后切除變(bian)壓器,不宜(yi)頻繁(fan)起(qi)動(dong),但起(qi)動(dong)較平穩,設備較簡單(dan),應(ying)用較為廣泛。
(4)延邊三角形啟動:;啟動的延伸,但控制很(hen)繁瑣,電機(ji)制造時有(you)特殊要求(qiu),很(hen)少采(cai)用。
(5)軟(ruan)啟動(dong)(dong):采用半導體(ti)整流和逆變(bian)技(ji)術(shu)來降低電機(ji)輸入電壓,逐步升高(gao)至額定電壓,起動(dong)(dong)很平滑(hua),控制很方便,但價格較高(gao),隨(sui)著大功率整流元件(jian)等(deng)半導體(ti)技(ji)術(shu)的(de)飛速發展,軟(ruan)啟動(dong)(dong)已(yi)應用得相當廣泛。
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