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電機的靜止部分,是汽輪發電機的關鍵部件之一。對于高壓、大容量的同步電機,采用旋轉磁極結構,由于勵磁部分的容量和電壓常較電樞小得多,把電樞裝設在定子上,主磁極裝設在轉子上。發電機定子主(zhu)要(yao)作(zuo)用在由轉子里形成旋(xuan)轉磁(ci)場里切割磁(ci)場產生(sheng)電壓。
定(ding)子(zi)(zi)結構(gou)非常(chang)簡單,通(tong)常(chang)由鐵心、線(xian)圈、骨(gu)架(有的沒有)、引(yin)線(xian)、拉(la)簧等組成。定(ding)子(zi)(zi)有兩(liang)種(zhong)(zhong)接(jie)(jie)(jie)線(xian)方(fang)式(shi)(shi),一種(zhong)(zhong)是4線(xian)式(shi)(shi),轉(zhuan)子(zi)(zi)串(chuan)連(lian)接(jie)(jie)(jie)在2個定(ding)子(zi)(zi)繞組之間,一種(zhong)(zhong)是2線(xian)式(shi)(shi),2個定(ding)子(zi)(zi)繞組連(lian)接(jie)(jie)(jie)好(hao)后再與轉(zhuan)子(zi)(zi)串(chuan)連(lian)接(jie)(jie)(jie)好(hao)后再與轉(zhuan)子(zi)(zi)串(chuan)連(lian)接(jie)(jie)(jie),(將4線(xian)式(shi)(shi)對角的2根引(yin)線(xian)接(jie)(jie)(jie)在一起)。兩(liang)種(zhong)(zhong)接(jie)(jie)(jie)線(xian)方(fang)式(shi)(shi)不同,但可以通(tong)用(yong)。引(yin)接(jie)(jie)(jie)線(xian)方(fang)式(shi)(shi)有兩(liang)種(zhong)(zhong):一種(zhong)(zhong)是軟線(xian)引(yin)出;一種(zhong)(zhong)是靠骨(gu)架上的插接(jie)(jie)(jie)件引(yin)出,該種(zhong)(zhong)繞線(xian)時要保留骨(gu)架。
定子鐵芯由(you)矽鋼片(pian)疊成,它的(de)主要(yao)作用是導磁(ci)(磁(ci)的(de)通路);上面開有槽(cao),槽(cao)內(nei)可安放定子繞(rao)組(zu)(zu)(電(dian)樞繞(rao)組(zu)(zu))