Induction Motor Torque
The mechanical power P available from any electric motor can be expressed as:
P= 2πNT / 60 watts
N =speed of the motor in r.p.m.
T = torque developed in N-m
If the gross output of the rotor of an induction motor is Pm and its speed is N r.p.m., then gross torque T developed is given by:
Note. Since windage and friction loss is small, Tg = Tsh,. This assumption hardly leads to any significant error.