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(Solved): In three-phase squirrel cage induction motor (IM)- (a) why is starting torque inferior as ...
In three-phase squirrel cage induction motor (IM)- (a) why is starting torque inferior as compared to DC motors; (b) large rating IM never started with DoL, why; (c) a 4-pole, 50-Hz, 3-phase IM has rotor resistance of \( 0.02 \Omega / \) phase and standstill reactance of \( 0.05 \Omega \) per phase? Determine the speed at which maximum torque is developed.
Expert Answer
(a) Starting torque of an induction motor is very less. As we know, starting torque of a 3-phase induction motor can be written as, Ts=KR2(R22+X22) Ro