1、改變防(fang)爆電機(ji)定子電壓調速

防爆(bao)電(dian)(dian)機(ji)(ji)的(de)轉(zhuan)(zhuan)矩與(yu)定子(zi)電(dian)(dian)壓的(de)平方成正比，改動(dong)(dong)定子(zi)電(dian)(dian)壓就可以改動(dong)(dong)防爆(bao)電(dian)(dian)機(ji)(ji)的(de)機(ji)(ji)械特(te)性和轉(zhuan)(zhuan)矩，這(zhe)種辦法(fa)不(bu)適(shi)用于一(yi)般籠式(shi)(shi)電(dian)(dian)機(ji)(ji)，由(you)于它(ta)的(de)轉(zhuan)(zhuan)子(zi)電(dian)(dian)阻(zu)很小，轉(zhuan)(zhuan)速(su)低(di)時電(dian)(dian)流會(hui)急劇(ju)上升。三(san)相(xiang)異步電(dian)(dian)動(dong)(dong)機(ji)(ji)轉(zhuan)(zhuan)子(zi)的(de)轉(zhuan)(zhuan)速(su)低(di)于旋轉(zhuan)(zhuan)磁(ci)(ci)(ci)場(chang)的(de)轉(zhuan)(zhuan)速(su)，轉(zhuan)(zhuan)子(zi)繞(rao)(rao)組因與(yu)磁(ci)(ci)(ci)場(chang)間存在著相(xiang)對運動(dong)(dong)而產生電(dian)(dian)動(dong)(dong)勢和電(dian)(dian)流，并(bing)與(yu)磁(ci)(ci)(ci)場(chang)相(xiang)互作用產生電(dian)(dian)磁(ci)(ci)(ci)轉(zhuan)(zhuan)矩，實現能量(liang)變換。可用于繞(rao)(rao)線式(shi)(shi)防爆(bao)電(dian)(dian)機(ji)(ji)，其轉(zhuan)(zhuan)子(zi)回路可串電(dian)(dian)阻(zu)或頻(pin)頻(pin)變阻(zu)器，大有些轉(zhuan)(zhuan)差能量(liang)損耗被(bei)引到外接(jie)電(dian)(dian)阻(zu)或頻(pin)頻(pin)變阻(zu)器上，減(jian)輕電(dian)(dian)動(dong)(dong)機(ji)(ji)的(de)發(fa)熱。

2、改變防(fang)爆電機轉子電阻調速

這種(zhong)調速辦法只(zhi)適用于繞線式防(fang)爆電(dian)(dian)機(ji)，在防(fang)爆電(dian)(dian)機(ji)的(de)轉子電(dian)(dian)路(lu)內(nei)串(chuan)入(ru)調速電(dian)(dian)阻，當(dang)負載一守時，轉子回路(lu)中(zhong)串(chuan)接的(de)電(dian)(dian)阻越大電(dian)(dian)動(dong)機(ji)的(de)轉速越低，越小轉速越高。此(ci)辦法設備簡略(lve)，控制便利，前(qian)期出資(zi)少，但轉差功率以發(fa)熱的(de)方(fang)式耗費在電(dian)(dian)阻上，屬有級調速，機(ji)械(xie)特性較軟。

3、防爆電機串級調速

較(jiao)領先(xian)的防(fang)爆(bao)電機(ji)(ji)(ji)(ji)串級(ji)調速應用(yong)了可控硅逆變器控制的串級(ji)調速線路(lu)，其優點是(shi)(shi)可以取得較(jiao)硬的機(ji)(ji)(ji)(ji)械特性，整流元件壓降小，設備占地面積小，無旋(xuan)轉有(you)些(xie)，噪(zao)聲小，保護(hu)較(jiao)簡略，是(shi)(shi)繞(rao)線式(shi)電動機(ji)(ji)(ji)(ji)很有(you)發展前途的調速辦法之一，其缺點是(shi)(shi)，防(fang)爆(bao)電機(ji)(ji)(ji)(ji)轉子回路(lu)裝有(you)濾(lv)波(bo)用(yong)的電抗器，故功率因數較(jiao)低(di)。