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(3) If an external resistance equal to the rotor resistance is added to the rotor circuit, then calculate: (a) The starting current and torque (use the complete equivalent circuit). (b) The developed maximum torque (c) The speed at which the maximum torque is developed.

(3) If an external resistance equal to the rotor resistance is added to the rotor circuit, then calculate: (a) The starting current and torque (use the complete equivalent circuit). (b) The developed maximum torque (c) The speed at which the maximum torque is developed.

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter35: Harmonics 916
Section: Chapter Questions
Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...
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please sir solve question 3, thanks for your help 

A 440 V, 50 Hz, 25 hp, 4-pole, Y-connected three-phase wound-rotor induction motor has the following circuit parameters: R1 = 0.46 02, R2 = 0.33 0, x1 = 1.10, X2=0.46 02, and Xm = 25 02. (stator referred) Rotational losses (including core loss) = 500 W (constant). (1) At a slip of 0.04, use the complete equivalent circuit model to calculate: (a) Motor speed (b) Stator current (c) Airgap and shaft torque (d) Input power factor (e) Efficiency (f) Starting current and torque. (2) Use the simplified Thevenen's equivalent circuit to calculate: (a) The developed maximum torque (b) The speed at which the maximum torque is developed. (c) The starting current (d) The starting torque (3) If an external resistance equal to the rotor resistance is added to the rotor circuit, then calculate: (a) The starting current and torque (use the complete equivalent circuit). (b) The developed maximum torque (c) The speed at which the maximum torque is developed.
Transcribed Image Text:A 440 V, 50 Hz, 25 hp, 4-pole, Y-connected three-phase wound-rotor induction motor has the following circuit parameters: R1 = 0.46 02, R2 = 0.33 0, x1 = 1.10, X2=0.46 02, and Xm = 25 02. (stator referred) Rotational losses (including core loss) = 500 W (constant). (1) At a slip of 0.04, use the complete equivalent circuit model to calculate: (a) Motor speed (b) Stator current (c) Airgap and shaft torque (d) Input power factor (e) Efficiency (f) Starting current and torque. (2) Use the simplified Thevenen's equivalent circuit to calculate: (a) The developed maximum torque (b) The speed at which the maximum torque is developed. (c) The starting current (d) The starting torque (3) If an external resistance equal to the rotor resistance is added to the rotor circuit, then calculate: (a) The starting current and torque (use the complete equivalent circuit). (b) The developed maximum torque (c) The speed at which the maximum torque is developed.
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