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Old 12-14-2014, 10:12 AM   #1453 (permalink)
cts_casemod
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Join Date: Nov 2012
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Time to use some brain cells folks

I'm designing an algorithm for the induction motor.

Ok, everyone knows that above nameplate speed the V/Hz ratio and the torque start to fall, but exactly by how much I cant find.

I thought about using the HP formula HP = (torque(nm)*Speed(RPM))/5252 but assuming the V/Hz ratio goes down, so does the slip induced current on the rotor, so I would have to increase the slip to have a constant secondary output. Problem is such functions are often not linear.

I cant really find any good source that discusses this on the field weakening region. Any ideas?
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