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[技术互助] A Tip on changing 3 phase AC motor rotation

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发表于 2010-4-14 11:27 | 显示全部楼层 |阅读模式
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本帖最后由 td456 于 2010-4-14 12:28 编辑 / D8 O' X) N1 g2 F7 e- S
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We all know that if you want to change the rotation of a three  phase AC motor.4 `1 b- s4 P; ]' E" }
Just swap any of the two phase leads.' F( d+ b2 Q8 L0 f& u  Q/ z
But for VFD application you need to do the swap after the inverter.. k3 S& u% g. K4 @9 Y. f0 A
If you swap the leads before the inverter, it will not work.
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发表于 2010-4-14 18:18 | 显示全部楼层
go go go
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发表于 2010-4-19 14:38 | 显示全部楼层
Yes, Good point.1 }% C  O7 E. ~3 W' L
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As the principal of the VFD works, bascially from AC to DC, then DC to AC.
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. R# a. Y3 |/ h( [The phase rotation of the output of the VFD connecting to the motor is based on the sequence "open" or "close" controlled by the inverter pre-set inside; any changes to the phase rotation of the feeder will not affect the DC rotation, as DC is NO phase at all.9 W& g8 O6 \5 T7 E5 W+ ^& Y: }2 l

1 m$ K& i; e. w* V: CThe only thing you can change the rotation of the motor is the output side of the VFD, NOT the input of the VFD.
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发表于 2010-7-4 00:19 | 显示全部楼层
老杨团队 追求完美
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