rhenders
Member
- Location
- Alabama, USA
Question: I have a 20 HP, 208V, 3 Phase, 3600 RPM electric motor driven by a Variable Frequency Drive (VFD). If I run that motor at 1700 RPM, will it still make the full 20 HP?
No, unless you tweak voltage/frequency patterns, and if you do you shouldn't change them to that large of an extent, you will only have half voltage when running at half frequency, but current can still be up to full load rating current, so if you are drawing full load current rating you are only drawing about half the power you would at full voltage and effectively have only about 10 hp output instead of 20.Question: I have a 20 HP, 208V, 3 Phase, 3600 RPM electric motor driven by a Variable Frequency Drive (VFD). If I run that motor at 1700 RPM, will it still make the full 20 HP?
Right, HP is a function of torque times RPM divided by 5252.I believe using the formula HP=(RPM * T) / 5252, that when you reduce rpm, the hp used reduces linearly.
I believe using the formula HP=(RPM * T) / 5252, that when you reduce rpm, the hp used reduces linearly.
Easier is P=Tw
w being omega, symbols don't seem to work here.