電(dian)(dian)(dian)機(ji)是一(yi)種電(dian)(dian)(dian)能(neng)和機(ji)械(xie)(xie)能(neng)相互轉(zhuan)(zhuan)化的裝置(zhi):給(gei)電(dian)(dian)(dian)機(ji)供電(dian)(dian)(dian),轉(zhuan)(zhuan)子就會(hui)轉(zhuan)(zhuan)動起來產生(sheng)(sheng)(sheng)機(ji)械(xie)(xie)能(neng);用原動機(ji)拖動電(dian)(dian)(dian)機(ji)轉(zhuan)(zhuan)子,定子繞組上的接線(xian)柱(zhu)上就會(hui)產生(sheng)(sheng)(sheng)電(dian)(dian)(dian)能(neng)。尤其對(dui)于用電(dian)(dian)(dian)動機(ji)發電(dian)(dian)(dian),在原理上似乎也很(hen)好解析:轉(zhuan)(zhuan)子被(bei)原動機(ji)拖動,切割磁感線(xian)產生(sheng)(sheng)(sheng)電(dian)(dian)(dian)流,轉(zhuan)(zhuan)子電(dian)(dian)(dian)流方向(xiang)反了,系統就變(bian)成發電(dian)(dian)(dian)狀(zhuang)態了。但(dan)仔(zi)細推敲,卻(que)總覺得不大清晰:像異步電(dian)(dian)(dian)機(ji),轉(zhuan)(zhuan)子電(dian)(dian)(dian)流方向(xiang)反了以后,定子電(dian)(dian)(dian)流的相位角是怎(zen)樣變(bian)化的?有沒有異步發電(dian)(dian)(dian)機(ji)?
從原(yuan)理上看,發電機(ji)(ji)(ji)是把(ba)機(ji)(ji)(ji)械能轉換成電能的裝置。就(jiu)(jiu)是說,用一臺原(yuan)動(dong)機(ji)(ji)(ji)(汽輪(lun)機(ji)(ji)(ji)、柴(chai)油機(ji)(ji)(ji)、水輪(lun)機(ji)(ji)(ji)等等)使電機(ji)(ji)(ji)的轉子旋轉起來,就(jiu)(jiu)可以(yi)產生(sheng)電能,即發電。理論上任何電機(ji)(ji)(ji)都(dou)是可逆的,既可以(yi)作為(wei)電動(dong)機(ji)(ji)(ji),也(ye)可以(yi)用作發電機(ji)(ji)(ji)。異步(bu)電動(dong)機(ji)(ji)(ji)也(ye)不例外,但卻有它的特殊性。
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