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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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* Q' h0 b$ c4 V" [We all know that if you want to change the rotation of a three  phase AC motor.
4 m9 ~0 `$ P2 l7 R) CJust swap any of the two phase leads.
- }# e+ z6 }' l* MBut for VFD application you need to do the swap after the inverter.9 q8 f/ ~# l$ q+ i; z* u5 S
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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As the principal of the VFD works, bascially from AC to DC, then DC to AC. $ O3 l2 r! e9 |8 r; ?% O% I

+ y3 Y6 G# v! O; D# iThe 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.% X9 e" W! w, F& d, T

# T2 E& `5 d# k) `0 AThe 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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