交(jiao)流變頻(pin)器的工作原理：變頻(pin)技術(shu)是通過(guo)變頻(pin)器改(gai)(gai)變電(dian)(dian)源頻(pin)率(lv)，從而改(gai)(gai)變交(jiao)流異步電(dian)(dian)動機(ji)的轉速的一種技術(shu)。通過(guo)變頻(pin)器先進行(xing)(xing)交(jiao)流到直流的變換，再通過(guo)變頻(pin)器進行(xing)(xing)直流到交(jiao)流的變換，從而控制交(jiao)流電(dian)(dian)機(ji)的轉速。

      而繞線機自動保護(hu)裝(zhuang)置項(xiang)目的(de)系列環形(xing)繞(rao)線機對變(bian)(bian)頻(pin)器(qi)的(de)控制是通過控制輸(shu)入變(bian)(bian)頻(pin)器(qi)的(de)模擬電(dian)壓，進而控制變(bian)(bian)頻(pin)器(qi)輸(shu)出(chu)電(dian)源的(de)頻(pin)率，使交流電(dian)機的(de)轉速跟隨輸(shu)出(chu)電(dian)源頻(pin)率的(de)變(bian)(bian)化而變(bian)(bian)化。

      而(er)三(san)相(xiang)異步電(dian)(dian)(dian)動(dong)機(ji)(ji)轉速由點頻(pin)(pin)率(lv)(lv)、電(dian)(dian)(dian)動(dong)機(ji)(ji)的(de)(de)極對數(shu)及轉差率(lv)(lv)決(jue)定(ding)(ding)(ding)。異步電(dian)(dian)(dian)動(dong)機(ji)(ji)的(de)(de)轉矩是(shi)電(dian)(dian)(dian)機(ji)(ji)的(de)(de)磁(ci)(ci)(ci)通(tong)與轉子內(nei)流過電(dian)(dian)(dian)流之間(jian)相(xiang)互作用(yong)而(er)產生(sheng)(sheng)的(de)(de)，在定(ding)(ding)(ding)頻(pin)(pin)率(lv)(lv)下，如果電(dian)(dian)(dian)壓一定(ding)(ding)(ding)而(er)只降低(di)頻(pin)(pin)率(lv)(lv)，那么(me)磁(ci)(ci)(ci)通(tong)就過大，磁(ci)(ci)(ci)回路飽和(he)(he)，嚴重(zhong)時(shi)將燒毀(hui)電(dian)(dian)(dian)機(ji)(ji)。因此，頻(pin)(pin)率(lv)(lv)與電(dian)(dian)(dian)壓要成(cheng)比例地改變(bian)，即(ji)改變(bian)頻(pin)(pin)率(lv)(lv)的(de)(de)同時(shi)控制(zhi)變(bian)頻(pin)(pin)器輸出電(dian)(dian)(dian)壓，使(shi)電(dian)(dian)(dian)動(dong)機(ji)(ji)的(de)(de)磁(ci)(ci)(ci)通(tong)保持(chi)一定(ding)(ding)(ding)，避免弱磁(ci)(ci)(ci)和(he)(he)磁(ci)(ci)(ci)飽和(he)(he)現象的(de)(de)產生(sheng)(sheng)。由于通(tong)用(yong)變(bian)頻(pin)(pin)器一般采用(yong)V/f控制(zhi)，即(ji)變(bian)壓變(bian)頻(pin)(pin)方(fang)式調速，改變(bian)頻(pin)(pin)率(lv)(lv)和(he)(he)電(dian)(dian)(dian)壓使(shi)最優的(de)(de)電(dian)(dian)(dian)機(ji)(ji)控制(zhi)方(fang)法(fa)。

因此選擇了變(bian)頻調(diao)速方(fang)法(fa)，變(bian)頻調(diao)速是改變(bian)電動機定(ding)子電源的頻率(lv)，從而改變(bian)其同步(bu)轉(zhuan)速的調(diao)速方(fang)法(fa)。其特點：

①效(xiao)率(lv)高，調速(su)過程中沒有附加損耗；

②應用(yong)范圍(wei)廣，可(ke)用(yong)于籠型(xing)異步電動機(ji)；

③調(diao)速范圍(wei)大(da)、特性(xing)硬、精度高(gao)。

變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)一般(ban)由鐵芯(xin)、線(xian)(xian)圈(quan)(quan)(quan)(quan)、外殼和必要的(de)(de)(de)絕(jue)(jue)緣(yuan)材料組(zu)成(cheng)。變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)(de)線(xian)(xian)圈(quan)(quan)(quan)(quan)一般(ban)分為高壓(ya)(ya)(ya)(ya)(ya)線(xian)(xian)圈(quan)(quan)(quan)(quan)和低(di)(di)壓(ya)(ya)(ya)(ya)(ya)線(xian)(xian)圈(quan)(quan)(quan)(quan),高壓(ya)(ya)(ya)(ya)(ya)線(xian)(xian)圈(quan)(quan)(quan)(quan)一般(ban)使(shi)用圓絕(jue)(jue)緣(yuan)導線(xian)(xian)繞(rao)制(zhi)(zhi)(zhi),低(di)(di)壓(ya)(ya)(ya)(ya)(ya)線(xian)(xian)圈(quan)(quan)(quan)(quan)一般(ban)使(shi)胃用扁平絕(jue)(jue)緣(yuan)導線(xian)(xian)或箔(bo)料繞(rao)制(zhi)(zhi)(zhi)。變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)(de)線(xian)(xian)圈(quan)(quan)(quan)(quan)繞(rao)制(zhi)(zhi)(zhi)是變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)制(zhi)(zhi)(zhi)造的(de)(de)(de)核心工(gong)序,對(dui)變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)(de)性能(neng)影響很大。它(ta)(ta)不僅直接(jie)決定著(zhu)變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)(de)外形(xing)尺(chi)寸、損耗和重量等主(zhu)要經(jing)濟技(ji)術指(zhi)標,還(huan)直接(jie)影響著(zhu)變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)(de)機(ji)械性能(neng)、絕(jue)(jue)緣(yuan)性能(neng)和耐(nai)熱性能(neng)等主(zhu)要質量指(zhi)標。傳(chuan)(chuan)統的(de)(de)(de)變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)線(xian)(xian)圈(quan)(quan)(quan)(quan)的(de)(de)(de)繞(rao)制(zhi)(zhi)(zhi)是依靠人力將絕(jue)(jue)緣(yuan)導線(xian)(xian)按照(zhao)生(sheng)產(chan)工(gong)藝要求(qiu)纏(chan)繞(rao)到工(gong)件上,并且(qie)由操作工(gong)人對(dui)阻數(shu)進(jin)行計數(shu)。采用傳(chuan)(chuan)統的(de)(de)(de)繞(rao)線(xian)(xian)方式,不僅繞(rao)制(zhi)(zhi)(zhi)效率(lv)低(di)(di),成(cheng)品線(xian)(xian)圈(quan)(quan)(quan)(quan)的(de)(de)(de)質量也(ye)較差。目前的(de)(de)(de)變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)線(xian)(xian)圈(quan)(quan)(quan)(quan)繞(rao)制(zhi)(zhi)(zhi)普遍釆用自(zi)動繞(rao)線(xian)(xian)機(ji),它(ta)(ta)能(neng)夠顯(xian)著(zhu)提升生(sheng)產(chan)效率(lv)和排(pai)線(xian)(xian)精(jing)度。在自(zi)動繞(rao)線(xian)(xian)機(ji)中(zhong),有(you)繞(rao)制(zhi)(zhi)(zhi)大型(xing)變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)(de)立式繞(rao)線(xian)(xian)機(ji),也(ye)有(you)繞(rao)制(zhi)(zhi)(zhi)較低(di)(di)電壓(ya)(ya)(ya)(ya)(ya)等級和較小(xiao)容量變(bian)(bian)壓(ya)(ya)(ya)(ya)(ya)器(qi)(qi)(qi)的(de)(de)(de)臥式繞(rao)線(xian)(xian)機(ji)和箔(bo)繞(rao)機(ji)。