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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 / L( f5 v6 F/ i* Y$ @2 [+ m4 Z: e* @

/ m: k. {7 X, E( n: T6 I5 O1 P/ sWe all know that if you want to change the rotation of a three  phase AC motor.% c5 b+ W- T4 K4 P
Just swap any of the two phase leads.4 R  }( r) N! u
But for VFD application you need to do the swap after the inverter.. q% T  P/ G9 W6 b& h* f
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.$ j# d- s( I2 d
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As the principal of the VFD works, bascially from AC to DC, then DC to AC. ) S- @. Q  y3 v% o$ i# @

: y* A( }, P& D6 U  vThe 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." c0 O7 G) |" U

0 Q' D3 o8 u" O3 c9 F# H# k2 \( ^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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