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Motor Kilowatts

Posted by SBsparky, 05 August 2009 · 2,069 views

Hi guys

Can someone please explain to me is a 3 phase motor running off a VSD at half speed (25hz) still able to produce its rated nameplate kilowatts?








Hi SBsparky

You are better to ask questions in the main forum, make sure that you are in the right section.

With a motor operating on a VFD, the torque is limited by the flux in the iron and that can not be increased beyond the full speed density.
At half speed, because the flux can not be higher than the full speed flux, the torque is the same as the full speed torque. Power equals torque time speed, so equal torque at half speed results in half power.

Best regards,
Mark.
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