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合理的容量選擇本身就是一種節能降耗措施。根據現有資料和經驗，比較簡便的方法有三種：
1）電機實際功率確定發。首先測定電機的實際功率，以此來選用變頻器的容量。
2）公式法。當一臺變頻器用於多臺電機時，應滿足：至少要考慮一臺電動機啟動電流的影響，以避免變頻器過流跳閘。
3）電機額定電流法變頻器。
變頻器容量選定過程，實際上是一個變頻器與電機的·佳匹配過程，·常見、也較安·的是使變頻器的容量大於或等於電機的額定功率，但實際匹配中要考慮電機的實際功率與額定功率相差多少，通常都是設備所選能力偏大，而實際需要的能力小，因此按電機的實際功率選擇變頻器是合理的，避免選用的變頻器過大，使投資增大。對於輕負載類，變頻器電流一般應按1.1N（N為電動機額定電流）來選擇，或按廠家在產品中標明的與變頻器的輸出功率額定值相配套的·大電機功率來選擇。
豫公安備 41010502000017號