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變頻電機也有能效等級，通常是根據國家或地區的相關標準進行評定和認證。例如，在中國，變頻電機的能效等級按照國家標準GB18613-2012《電動機能效限定值及能效等級》進行劃分，分為IE1、IE2、IE3、IE4四個等級，其中IE4為高能效等級。不同的能效等級代表著不同的能效水平，能效等級越高，電機的能效越好，能夠更有效地節約能源和降低能耗，同時也能夠降低運行成本，提高電機的使用壽命。因此，在選擇變頻電機時，除了考慮額定功率、轉速和負載特性外，也需要關注其能效等級，以便地滿足能源節約和環保要求。

　　變頻電機能效等級標準通常是根據國家、行業和組織發布的標準來劃分的。以下是中國國家標準 GB18613-2012《電動機系統能效限定值及能效等級》對變頻電機能效等級的劃分：

　　IE1：標準能效，與普通異步電機相同，能效較低；

　　IE2：能，比IE1提高了的能效；

　　IE3：超能，比IE2提高了更高的能效，通常是新的變頻電機產品的標準；

　　IE4：極能，目前很少有制造商能夠生產達到IE4等級的變頻電機。

　　需要注意的是，能效等級高的變頻電機通常價格更高，但長期來看可以帶來更多的節能效益。

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