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Question: a determine the speed of the motor at maximum torque...

Question details

A 3ó, 460 V, 60Hz, four-pole wound-rotor induction motor develops full-load torque at a slip of 0.04 when the slip rings are short-circuited. The maximum torque it can develop is 2.5 pu. The stator leakage impedance is negligible. The rotor resistance measured between two slip rings is 0.5

(a) Determine the speed of the motor at maximum torque.

(b)Determine the starting torque in per unit. (Full-load torque is one per- unit torque.)

(c) Determine the value of resistance to be added to each phase of the rotor circuit so that maximum torque is developed at the starting condition

(d)Determine the speed at full-load torque with the added rotor resistance of part (c)

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