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防爆电机调速方法有哪些?

1、改变(bian)防(fang)爆电(dian)(dian)机定子电(dian)(dian)压调(diao)速
 
防(fang)爆(bao)电(dian)(dian)(dian)(dian)(dian)机(ji)的(de)(de)转(zhuan)矩与(yu)定子(zi)电(dian)(dian)(dian)(dian)(dian)压的(de)(de)平(ping)方(fang)成正(zheng)比,改(gai)动定子(zi)电(dian)(dian)(dian)(dian)(dian)压就(jiu)可以改(gai)动防(fang)爆(bao)电(dian)(dian)(dian)(dian)(dian)机(ji)的(de)(de)机(ji)械(xie)特性和(he)转(zhuan)矩,这种(zhong)办法不适用于一般笼式电(dian)(dian)(dian)(dian)(dian)机(ji),由于它的(de)(de)转(zhuan)子(zi)电(dian)(dian)(dian)(dian)(dian)阻很小,转(zhuan)速低(di)时电(dian)(dian)(dian)(dian)(dian)流(liu)会急剧上升。三相异步(bu)电(dian)(dian)(dian)(dian)(dian)动机(ji)转(zhuan)子(zi)的(de)(de)转(zhuan)速低(di)于旋转(zhuan)磁(ci)场(chang)的(de)(de)转(zhuan)速,转(zhuan)子(zi)绕组(zu)因与(yu)磁(ci)场(chang)间存在着(zhe)相对运(yun)动而产(chan)生电(dian)(dian)(dian)(dian)(dian)动势和(he)电(dian)(dian)(dian)(dian)(dian)流(liu),并与(yu)磁(ci)场(chang)相互(hu)作用产(chan)生电(dian)(dian)(dian)(dian)(dian)磁(ci)转(zhuan)矩,实(shi)现能量(liang)变(bian)换。可用于绕线(xian)式防(fang)爆(bao)电(dian)(dian)(dian)(dian)(dian)机(ji),其转(zhuan)子(zi)回路(lu)可串电(dian)(dian)(dian)(dian)(dian)阻或频(pin)(pin)频(pin)(pin)变(bian)阻器,大有(you)些转(zhuan)差(cha)能量(liang)损(sun)耗被(bei)引到外接电(dian)(dian)(dian)(dian)(dian)阻或频(pin)(pin)频(pin)(pin)变(bian)阻器上,减轻电(dian)(dian)(dian)(dian)(dian)动机(ji)的(de)(de)发热。
 
2、改变防爆电机转子(zi)电阻调速
 
这种调(diao)速(su)办(ban)法只适用于绕线式(shi)防(fang)爆(bao)电(dian)(dian)机(ji),在(zai)防(fang)爆(bao)电(dian)(dian)机(ji)的转子电(dian)(dian)路内(nei)串(chuan)入调(diao)速(su)电(dian)(dian)阻,当负载一守(shou)时,转子回路中串(chuan)接的电(dian)(dian)阻越(yue)大电(dian)(dian)动(dong)机(ji)的转速(su)越(yue)低,越(yue)小(xiao)转速(su)越(yue)高。此办(ban)法设备简略,控制(zhi)便利(li),前期(qi)出资少,但转差功率以发热的方式(shi)耗费在(zai)电(dian)(dian)阻上,属有级(ji)调(diao)速(su),机(ji)械特性(xing)较(jiao)软。
 
3、防爆(bao)电机串级调(diao)速
 
较(jiao)(jiao)领先的防爆电(dian)机串级调(diao)速应用了(le)可(ke)控(kong)硅逆变器控(kong)制的串级调(diao)速线路,其(qi)优点(dian)是可(ke)以取(qu)得较(jiao)(jiao)硬的机械特(te)性,整(zheng)流元件压降小,设备占地面(mian)积小,无(wu)旋(xuan)转(zhuan)有(you)些,噪声(sheng)小,保护较(jiao)(jiao)简(jian)略,是绕(rao)线式(shi)电(dian)动机很有(you)发展前途的调(diao)速办(ban)法之一,其(qi)缺(que)点(dian)是,防爆电(dian)机转(zhuan)子回路装有(you)滤波用的电(dian)抗(kang)器,故功(gong)率因数较(jiao)(jiao)低。
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