秒速赛车必赢计划软件手机版下载

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變頻電機運轉過程中發熱的原因

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秒速赛车必赢计划软件手机版下载① YIBANYIBUDIANJIZAIDIPINDUANYUNZHUANSHI

交流變頻電機一般異步電動機在規劃制作時,是以飽滿磁通基本要求為規范的。在電機運轉在額外頻率之下時,由頻率(f)與磁通(Φ)反比關系,即Φ∝1/f可知,隨著外加頻率下降,定子的磁通量就會上升,造成定子鐵芯磁密度呈現過飽滿,是勵磁電流敏捷上升,定子繞組溫度就會敏捷升高。為減小Φ改變,變頻器在相同負載轉矩下,通過電流調理閉環控制相同的定子電流,并堅持U/f≈KΦ(K:常數)。但是,過低的頻率使得加在定子繞組上的電壓(U)過低,相應的定子阻抗壓降因素影響增大。使得Φ不能堅持在改變范圍內而上升。在一些自動化控制體系要求較高的場合下,為確保體系安穩運轉,下降電機的溫度,常常在低頻端增設低頻補償裝置或改用變頻電機,但也提高了本錢。


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