Engineering - (b) A 400V, 4-pole, 50HZ induction motor develops rated torque at 1440 r/min.?

Question

...  Calculate the voltage and frequency to be supplied to the motor for rated torque to be developed at 800 r/min. Assume constant air-gap flux and neglect the effect of stator impedance

Answer

That is a bogus question because it takes a lot more iron to develop the same torque at a lower frequency. That is why airplanes all use 400 Hz power instead of 60 Hz. Much less iron.

Engineering - (b) A 400V, 4-pole, 50HZ induction motor develops rated torque at 1440 r/min.?

Answers (1)