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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.
# }  a" g, Y" G: HJust swap any of the two phase leads.4 i( |4 _! Y+ L  ~- h
But for VFD application you need to do the swap after the inverter.+ w9 Z6 n* B2 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.$ ^, d, L) T/ z( j; w' l, G
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As 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.
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/ C4 v' T! ]+ Q, i+ o: ^6 h5 EThe 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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