AC MACHINES-1 (66761) Theory
Completion requirements
11. Recognize the concept of development of rotating magnetic field and torque in rotor.
11.5. Explicit the deduction of the equation of starting torque, running torque and maximum torque.
Putting this value in above equation we get,
s = slip of induction motor
We know that power factor is defined as ratio of resistance to that of impedance. The power factor of the rotor circuit is
Putting the value of flux φ, rotor current I2, power factor cosθ2 in the equation of torque we get,
Combining similar term we get,
Removing proportionality constant we get,
Where, ns is synchronous speed in r. p. s, ns = Ns / 60. So, finally the equation of torque becomes,
