GE发那科IC693BEM321RR

GE发那科IC693BEM321RR

IC693BEM321RR直流电抗器能有效降低输入电流谐波，提高功率因数。 电感大小选择合理，电感越大，改善功率因素的效果越好，但电感太大，也会增大基波电流的电压降，减小变频器的输入电压，减小了变频器的大输出功率。

直流电抗器的电感值的选择一般为同样变频器输入侧交流电抗器3% 阻抗电感量的2-3倍，少要1.7 倍)，即

LDC=(2~3)LAC

此外还有一种利用经验公式来计算直流电抗器电感量大小：

L=25mH/PM

PM为电机额定功率。

电抗器额定电流大小计算：

IL=(1.1~1.2)*π*Io/√6

Io为变频器额定输出电流。

直流母线电解电容计算直流电解电容是变频器成本比重较大的一块。 用于380V通用变频器的直流电解电容一般都是采用两只400V串连来满足536V的耐压值，220V的单相变频器一般使用1只400V即可满足耐压要求。 一般容量选取原则是：100uF/1KVA。 由于电容器规格有限，电容量选取范围可定为85uF～110uF/KVA，单相输入的机型电容量应向上取大一些的值。

IC693BEM321RR 

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