1、改變防爆電(dian)機定子電壓調速

防爆電(dian)(dian)(dian)機(ji)(ji)的(de)(de)(de)轉(zhuan)(zhuan)(zhuan)矩與(yu)定子(zi)(zi)電(dian)(dian)(dian)壓的(de)(de)(de)平(ping)方成正比，改動(dong)定子(zi)(zi)電(dian)(dian)(dian)壓就可(ke)以(yi)改動(dong)防爆電(dian)(dian)(dian)機(ji)(ji)的(de)(de)(de)機(ji)(ji)械特性和轉(zhuan)(zhuan)(zhuan)矩，這(zhe)種辦法(fa)不適用于(yu)(yu)一般(ban)籠式(shi)電(dian)(dian)(dian)機(ji)(ji)，由于(yu)(yu)它的(de)(de)(de)轉(zhuan)(zhuan)(zhuan)子(zi)(zi)電(dian)(dian)(dian)阻(zu)很小，轉(zhuan)(zhuan)(zhuan)速(su)低時電(dian)(dian)(dian)流會急劇上升。三(san)相異步電(dian)(dian)(dian)動(dong)機(ji)(ji)轉(zhuan)(zhuan)(zhuan)子(zi)(zi)的(de)(de)(de)轉(zhuan)(zhuan)(zhuan)速(su)低于(yu)(yu)旋轉(zhuan)(zhuan)(zhuan)磁場(chang)的(de)(de)(de)轉(zhuan)(zhuan)(zhuan)速(su)，轉(zhuan)(zhuan)(zhuan)子(zi)(zi)繞組因與(yu)磁場(chang)間存在著相對運動(dong)而(er)產生(sheng)電(dian)(dian)(dian)動(dong)勢和電(dian)(dian)(dian)流，并與(yu)磁場(chang)相互(hu)作用產生(sheng)電(dian)(dian)(dian)磁轉(zhuan)(zhuan)(zhuan)矩，實(shi)現能(neng)(neng)量變(bian)換。可(ke)用于(yu)(yu)繞線式(shi)防爆電(dian)(dian)(dian)機(ji)(ji)，其轉(zhuan)(zhuan)(zhuan)子(zi)(zi)回路可(ke)串電(dian)(dian)(dian)阻(zu)或(huo)頻頻變(bian)阻(zu)器，大有(you)些轉(zhuan)(zhuan)(zhuan)差能(neng)(neng)量損耗(hao)被引(yin)到外接電(dian)(dian)(dian)阻(zu)或(huo)頻頻變(bian)阻(zu)器上，減輕電(dian)(dian)(dian)動(dong)機(ji)(ji)的(de)(de)(de)發熱。

2、改變防(fang)爆電(dian)機轉子電阻調速

這種調速(su)辦法(fa)只適用于繞線式防爆電(dian)(dian)機，在(zai)防爆電(dian)(dian)機的轉(zhuan)子(zi)電(dian)(dian)路(lu)內串入(ru)調速(su)電(dian)(dian)阻，當負載一守時，轉(zhuan)子(zi)回路(lu)中串接的電(dian)(dian)阻越大電(dian)(dian)動機的轉(zhuan)速(su)越低，越小(xiao)轉(zhuan)速(su)越高。此(ci)辦法(fa)設備(bei)簡(jian)略，控制(zhi)便(bian)利，前(qian)期出資(zi)少(shao)，但轉(zhuan)差(cha)功率以發熱(re)的方式耗(hao)費在(zai)電(dian)(dian)阻上，屬有級(ji)調速(su)，機械特性(xing)較軟。

3、防爆電(dian)機串級調速

較領(ling)先的(de)防(fang)爆(bao)電(dian)機(ji)(ji)串級(ji)調(diao)速(su)應用(yong)了可控硅逆變器(qi)控制的(de)串級(ji)調(diao)速(su)線路，其(qi)優點(dian)是(shi)可以取得(de)較硬的(de)機(ji)(ji)械特(te)性，整流(liu)元(yuan)件壓降小(xiao)，設(she)備(bei)占地面積小(xiao)，無(wu)旋轉(zhuan)有(you)些，噪(zao)聲小(xiao)，保護較簡略，是(shi)繞線式電(dian)動機(ji)(ji)很有(you)發展前途(tu)的(de)調(diao)速(su)辦法之(zhi)一，其(qi)缺點(dian)是(shi)，防(fang)爆(bao)電(dian)機(ji)(ji)轉(zhuan)子回路裝有(you)濾波用(yong)的(de)電(dian)抗器(qi)，故(gu)功(gong)率因數較低。