輸(shu)入電抗器(qi)(qi)串聯在電源與變(bian)頻器(qi)(qi)輸(shu)入側之間。其主要功能是抑制諧波電流，提高功率因數，削弱(ruo)輸(shu)入電路中的浪(lang)涌電流對變(bian)頻器(qi)(qi)的沖擊，削弱(ruo)電源電壓不平衡對變(bian)頻器(qi)(qi)的影響。

輸(shu)(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗(kang)器(qi)(qi)串聯在變(bian)頻器(qi)(qi)輸(shu)(shu)出側與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)之間。其(qi)(qi)主要功能是(shi)抑制干擾信號從變(bian)頻器(qi)(qi)通(tong)過電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源線傳(chuan)導干擾到電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)。為了減(jian)少電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁噪聲和損耗，在變(bian)頻器(qi)(qi)輸(shu)(shu)出側設(she)置(zhi)輸(shu)(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗(kang)器(qi)(qi)，可以(yi)有效(xiao)地削弱輸(shu)(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流中(zhong)的(de)(de)(de)高次(ci)諧(xie)波成分，尤(you)其(qi)(qi)是(shi)當(dang)變(bian)頻器(qi)(qi)輸(shu)(shu)出到電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)之間的(de)(de)(de)距離較(jiao)長(chang)時，輸(shu)(shu)出長(chang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)纜之間存在較(jiao)大(da)的(de)(de)(de)分布電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容(rong)，會造面(mian)(mian)變(bian)頻器(qi)(qi)的(de)(de)(de)輸(shu)(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓在電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)側產生(sheng)很(hen)高的(de)(de)(de)振蕩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓，一方(fang)面(mian)(mian)對(dui)外界產生(sheng)干擾，另(ling)一方(fang)面(mian)(mian)過高的(de)(de)(de)振蕩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓也會影響電(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)的(de)(de)(de)使(shi)用(yong)壽(shou)命，在這種(zhong)場合增加(jia)輸(shu)(shu)出電(dian)(dian)(dian)(dian)(dian)(dian)(dian)抗(kang)器(qi)(qi)是(shi)非(fei)常重要的(de)(de)(de)有效(xiao)措施(shi)。

直流(liu)(liu)(liu)電抗器串聯在變(bian)頻器整流(liu)(liu)(liu)橋和濾波(bo)電容器之間。它(ta)的(de)功(gong)能比較單一(yi)，就(jiu)是削弱輸入電流(liu)(liu)(liu)中高次諧波(bo)成分和減小(xiao)浪(lang)涌電流(liu)(liu)(liu)。

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