6AV6648-0AC11-3AX0的輸出功率該如何選擇？

答；如果說用一臺變頻器拖動三臺電動機(jī)，首先得考慮；

①變頻器的額定輸出電壓與拖動的三臺電動機(jī)的額定工作電壓一致；即Ufe=Ue Ufe為變頻器的額定輸出電壓，Ue為電動機(jī)的額定工作電壓。

②變頻器的額定功率大于三臺電動機(jī)額定功率的總和，電動機(jī)一般用有功功率KW表示，而變頻器則是用視在功率KVA表示，故選擇時(shí)可按照下式計(jì)算：S=P/ηcosφ，式中的P為電動機(jī)額定功率，η為電動機(jī)的效率，cosφ為電動機(jī)功率因數(shù)。

6AV6648-0AC11-3AX0

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