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Frequency And Torque


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#1 yuri

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Posted 05 October 2012 - 06:54 PM

Hello
Can someone say me in which case the torque of an induction motor starting at lowered voltage will be higher :
1. When the voltage frequency is not changed
2. Or when the frequency is proportionally lowered ?

#2 marke

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Posted 06 October 2012 - 06:10 AM

Hello Yuri

If you reduce the voltage and keep the frequency constant, then the V/Hz ratio is reduced, the flux in the iron is reduced and the torque is also reduced.
If you reduce the voltage and frequency proportionally, the V/Hz ratio remains constant and the troque does not change.

Best regards,
Mark.

#3 yuri

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Posted 06 October 2012 - 07:12 PM

Hello Mark !
Thank you very much, I also thought so, you confirmed it (was a bit in a doubt about that however)
My best regards




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