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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 : M! s3 g* }) R

: A9 d$ P. V; P7 MWe all know that if you want to change the rotation of a three  phase AC motor./ t  [& X( b* ^: v+ q  g9 K; m) j
Just swap any of the two phase leads.. z; r$ @' J. J) O# i
But for VFD application you need to do the swap after the inverter.$ a/ T6 r3 E5 d
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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6 l( P  y1 J# z" ]# A! _, MAs the principal of the VFD works, bascially from AC to DC, then DC to AC.
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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.6 k5 o8 U' E: R8 z9 n  |

$ f: Y2 R" ]  M3 B7 mThe 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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