同步永磁電機優點

同步永磁(ci)(ci)電機(ji)采用(yong)(yong)永磁(ci)(ci)體勵(li)磁(ci)(ci)，減(jian)少了勵(li)磁(ci)(ci)繞組、電刷、集電環結構，避免了傳統勵(li)磁(ci)(ci)式發電機(ji)勵(li)磁(ci)(ci)繞組易(yi)燒(shao)毀(hui)、斷線，電刷、集電環易(yi)磨(mo)損等故障，使用(yong)(yong)性能更可靠(kao)。

轉子不存在勵磁繞組(zu)、電刷、集電環(huan)等損耗(hao)部件，效(xiao)率(lv)(lv)得(de)到明顯提(ti)高，功率(lv)(lv)因數(shu)可維持(chi)在0.95以上(shang)，在負(fu)載波(bo)動(dong)的情況(kuang)下可維持(chi)較高力能水平(ping)，對于(yu)該裝(zhuang)備容量與負(fu)載匹配(pei)情況(kuang)，綜合節電率(lv)(lv)可達(da)15%以上(shang)。

1、改變了機械裝備的傳動模式，將永磁電機與機械負載融為一體，簡化機械裝備的傳動鏈，減掉傳統低速機械運行所需的龐大復雜的齒輪減速機，可減少許多制造成本與人力成本。
2、提供機械裝備傳動效率，永磁電機與異步電動機相比，本身效率與功率因數等力能指標有明顯的優越性，再加上取消了機械裝備的中間環節，大幅度的提供了傳動鏈的效率。
3、采用(yong)變頻起動，系統帶載起動能力(li)強，切降低了大的起動點(dian)了給電網帶來的沖(chong)(chong)擊，同時也(ye)降低了傳(chuan)動系統的機械沖(chong)(chong)擊。

同步永磁電機主要特性

1、電壓的調節

自(zi)動調節(jie)勵磁(ci)(ci)系統可以看成為(wei)一個以電(dian)(dian)(dian)(dian)(dian)壓為(wei)被調量的(de)負(fu)反(fan)饋控制系統。無功負(fu)荷電(dian)(dian)(dian)(dian)(dian)流(liu)是造成發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)機(ji)端(duan)電(dian)(dian)(dian)(dian)(dian)壓下降的(de)主要原因，當勵磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)流(liu)不變時，發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)端(duan)電(dian)(dian)(dian)(dian)(dian)壓將隨無功電(dian)(dian)(dian)(dian)(dian)流(liu)的(de)增大而降低。但是為(wei)了滿足用戶對電(dian)(dian)(dian)(dian)(dian)能質量的(de)要求(qiu)，發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)端(duan)電(dian)(dian)(dian)(dian)(dian)壓應(ying)基(ji)本保(bao)持不變，實現這一要求(qiu)的(de)辦(ban)法是隨無功電(dian)(dian)(dian)(dian)(dian)流(liu)的(de)變化調節(jie)發(fa)(fa)電(dian)(dian)(dian)(dian)(dian)機(ji)的(de)勵磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)流(liu)。

2、無功(gong)功(gong)率的調節：

發(fa)電(dian)(dian)機(ji)(ji)(ji)(ji)與(yu)系(xi)統并(bing)(bing)聯運(yun)行(xing)時(shi)，可以(yi)認為是與(yu)無(wu)(wu)限大容(rong)量電(dian)(dian)源(yuan)的(de)(de)(de)母(mu)線運(yun)行(xing)，要改變(bian)發(fa)電(dian)(dian)機(ji)(ji)(ji)(ji)勵磁(ci)電(dian)(dian)流(liu)(liu)，感(gan)應(ying)電(dian)(dian)勢和(he)定子電(dian)(dian)流(liu)(liu)也跟著變(bian)化，此時(shi)發(fa)電(dian)(dian)機(ji)(ji)(ji)(ji)的(de)(de)(de)無(wu)(wu)功(gong)(gong)電(dian)(dian)流(liu)(liu)也跟著變(bian)化。當發(fa)電(dian)(dian)機(ji)(ji)(ji)(ji)與(yu)無(wu)(wu)限大容(rong)量系(xi)統并(bing)(bing)聯運(yun)行(xing)時(shi)，為了改變(bian)發(fa)電(dian)(dian)機(ji)(ji)(ji)(ji)的(de)(de)(de)無(wu)(wu)功(gong)(gong)功(gong)(gong)率，必(bi)須調(diao)節發(fa)電(dian)(dian)機(ji)(ji)(ji)(ji)的(de)(de)(de)勵磁(ci)電(dian)(dian)流(liu)(liu)。此時(shi)改變(bian)的(de)(de)(de)發(fa)電(dian)(dian)機(ji)(ji)(ji)(ji)勵磁(ci)電(dian)(dian)流(liu)(liu)并(bing)(bing)不是通常所(suo)說的(de)(de)(de)“調(diao)壓”，而是只是改變(bian)了送入系(xi)統的(de)(de)(de)無(wu)(wu)功(gong)(gong)功(gong)(gong)率。

3、無功負荷的分配：

并聯運行(xing)(xing)(xing)的發電機(ji)根(gen)據各自(zi)(zi)的額定容量，按比例進(jin)行(xing)(xing)(xing)無(wu)功(gong)(gong)電流的分配(pei)。大容量發電機(ji)應負(fu)(fu)擔(dan)較多無(wu)功(gong)(gong)負(fu)(fu)荷，而容量較小的則負(fu)(fu)提供(gong)較少的無(wu)功(gong)(gong)負(fu)(fu)荷。為(wei)了實現無(wu)功(gong)(gong)負(fu)(fu)荷能自(zi)(zi)動(dong)(dong)分配(pei)，可以通過自(zi)(zi)動(dong)(dong)高壓(ya)調節(jie)的勵(li)磁裝置，改變發電機(ji)勵(li)磁電流維持其端電壓(ya)不變，還可對(dui)發電機(ji)電壓(ya)調節(jie)特性的傾斜度(du)進(jin)行(xing)(xing)(xing)調整(zheng)，以實現并聯運行(xing)(xing)(xing)發電機(ji)無(wu)功(gong)(gong)負(fu)(fu)荷的合理分配(pei)。