Find slip at maximum torque

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Reference no: EM131265470

A 75 kW, 440 V, 3-phase, 6-pole, 50 Hz, wound-rotor induction motor has a full- load slip of 0.04 and the slip at maximum torque of 0.2 when operating at rated voltage and frequency with rotor winding short-circuited at the slip-rings. As sume the stator resistance and rotational losses to be negligible. Find:

(a) maximum torque,

(b) starting torque, and

(c) full-load rotor copper-loss. The rotor resistance is now doubled by adding an external series resistance. Determine:

(d) slip at full-load,

(e) full-load torque, and

(f ) slip at maximum torque.

Reference no: EM131265470

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