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陳大圍
工控新人,還請多多指教
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樓主  發(fā)表于: 2012-03-28 22:33
眾所周知,單相交流電機的大家族里有這種類(lèi)型,就是有啟動(dòng)電容和運行電容的這種類(lèi)型,我想知道在一臺這樣的電機上,啟動(dòng)電容的C與運行電容的C哪個(gè)比較大,它倆之間有什么函數關(guān)系嗎?還有我知道某電機的功率,怎么去配它啟動(dòng)電容和運行電容?假如某電機出力不足,轉矩明顯下降,有沒(méi)有跟運行電容的C值下降有關(guān)?或是其他什么原因?THANKS
專(zhuān)心學(xué)工控技術(shù),請各位幫忙指教
劉麗艷
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1樓  發(fā)表于: 2012-03-29 19:18
啟動(dòng)電容都比運轉電容大,而且2個(gè)電容是并聯(lián)的,啟動(dòng)時(shí)2個(gè)電容工作,電機轉數上去后啟動(dòng)電容會(huì )退出,一般靠離心開(kāi)關(guān)控制,運行電容繼續接在電機的啟動(dòng)繞組上,電機出力不足運行電容的容量下降的可能性較大,一般1.5-2.2KW的電機啟動(dòng)電容為200UF,運行電容40UF
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