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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
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We all know that if you want to change the rotation of a three  phase AC motor.
# n: b/ L. c- IJust swap any of the two phase leads.1 u* G$ z/ f  G) ?* c
But for VFD application you need to do the swap after the inverter.- u4 i; T; z" }. T0 {
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.
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" m1 K2 t9 }+ T/ Y- wAs the principal of the VFD works, bascially from AC to DC, then DC to AC. 5 I, R2 C5 N! q

) n5 f8 O, Y+ F- v& r$ k0 Q- aThe 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.  V3 H; @3 B1 g1 e! |
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The 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
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