變壓器由鐵芯(或(huo)磁芯)和線圈(quan)組成,線圈(quan)有(you)兩(liang)個(ge)或(huo)兩(liang)個(ge)以上的(de)繞組,其(qi)中接電源的(de)繞組叫初級(ji)線圈(quan),其(qi)余的(de)繞組叫次級(ji)線圈(quan)。它可以變換交流電壓、電流和阻抗(kang)。
鐵(tie)(tie)心的(de)(de)作用(yong)是(shi)加強兩個線(xian)圈(quan)(quan)(quan)間(jian)的(de)(de)磁耦合。為了減少鐵(tie)(tie)內渦流和磁滯損(sun)耗,鐵(tie)(tie)心由涂漆(qi)的(de)(de)硅鋼片疊(die)壓(ya)(ya)而(er)成;兩個線(xian)圈(quan)(quan)(quan)之間(jian)沒有電(dian)(dian)的(de)(de)聯(lian)系,線(xian)圈(quan)(quan)(quan)由絕緣銅(tong)線(xian)(或鋁線(xian))繞成。一個線(xian)圈(quan)(quan)(quan)接(jie)交(jiao)流電(dian)(dian)源稱(cheng)為初級線(xian)圈(quan)(quan)(quan)(或原(yuan)線(xian)圈(quan)(quan)(quan)),另一個線(xian)圈(quan)(quan)(quan)接(jie)用(yong)電(dian)(dian)器(qi)稱(cheng)為次級線(xian)圈(quan)(quan)(quan)(或副(fu)(fu)線(xian)圈(quan)(quan)(quan))。實際的(de)(de)變(bian)壓(ya)(ya)器(qi)是(shi)很(hen)復(fu)雜的(de)(de),不可避免地存(cun)在銅(tong)損(sun)(線(xian)圈(quan)(quan)(quan)電(dian)(dian)阻(zu)發(fa)熱)、鐵(tie)(tie)損(sun)(鐵(tie)(tie)心發(fa)熱)和漏磁(經空氣(qi)閉合的(de)(de)磁感(gan)應線(xian))等(deng),為了簡(jian)化(hua)討論(lun)這里只(zhi)介紹理想變(bian)壓(ya)(ya)器(qi)。理想變(bian)壓(ya)(ya)器(qi)成立的(de)(de)條件是(shi):忽略(lve)漏磁通(tong),忽略(lve)原(yuan)、副(fu)(fu)線(xian)圈(quan)(quan)(quan)的(de)(de)電(dian)(dian)阻(zu),忽略(lve)鐵(tie)(tie)心的(de)(de)損(sun)耗,忽略(lve)空載電(dian)(dian)流(副(fu)(fu)線(xian)圈(quan)(quan)(quan)開路原(yuan)線(xian)圈(quan)(quan)(quan)線(xian)圈(quan)(quan)(quan)中的(de)(de)電(dian)(dian)流)。
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