IC693UDR005RR

三相電機變單相電機后的效率不一樣。所謂的電機效率是指電機輸出功率P2與電機輸入功率P1比值的百分數(shù)叫做電機的效率，用希臘字母“η”表示，即：η=（P2/P1）×100%。一般三相交流異步電機的效率為87％，進口電機的效率高達92％，這些技術(shù)參數(shù)在電機銘牌上有標注。

　　本來三相交流異步電機的額定功率、額定轉(zhuǎn)數(shù)、額定電壓、額定電流、效率、功率因數(shù)是合為一體的，如果任意改變它的其中一個參數(shù)，其他參數(shù)變化了。因為三相電機和單相電機的空載電流不一樣，電機空載電流一般大中功率電機約占額定電流的20％~35％，小功率電機的空載電流約占額定電流的35％~50％。

　　再者，三相電機不需要啟動電容，靠三相交流電的三個120?相位差就可以自動建立旋轉(zhuǎn)磁場，而單相交流電機就沒有啟動時的旋轉(zhuǎn)磁場，完全依靠啟動電容的超前90?來獲得啟動力矩旋轉(zhuǎn)的。

IC693UDR005RR

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