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A three-phase, 480 V, six-pole, Y-connected, 60 Hz, 10 kW induction motor is driving a constant torque load of 60 Nm. The parameters of the motor are: R₁ = 0.4 02, R₂ = 0.50 (actual rotor resistance), Xeq = 40, N₁ / N₂ = 2 (turn ratio between stator and rotor windings) Calculate the following: a. Motor torque. b. Motor current c. Starting torque d. Starting current A voltage is injected in the rotor circuit to reduce the motor speed by 40%. e. Calculate the magnitude of the injected voltage. f. Repeat (a) to (d) for the motor with injected voltage. g. Calculate the power delivered to the source of injected voltage.

A three-phase, 480 V, six-pole, Y-connected, 60 Hz, 10 kW induction motor is driving a constant torque load of 60 Nm. The parameters of the motor are: R₁ = 0.4 02, R₂ = 0.50 (actual rotor resistance), Xeq = 40, N₁ / N₂ = 2 (turn ratio between stator and rotor windings) Calculate the following: a. Motor torque. b. Motor current c. Starting torque d. Starting current A voltage is injected in the rotor circuit to reduce the motor speed by 40%. e. Calculate the magnitude of the injected voltage. f. Repeat (a) to (d) for the motor with injected voltage. g. Calculate the power delivered to the source of injected voltage.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Problem 5 A three-phase, 480 V, six-pole, Y-connected, 60 Hz, 10 kW induction motor is driving a constant torque load of 60 Nm. The parameters of the motor are: R₁ = 0.4 02, R₂ = 0.50 (actual rotor resistance), Xeq = 40, N₁ / N₂ = 2 (turn ratio between stator and rotor windings) Calculate the following: a. Motor torque. b. Motor current c. Starting torque d. Starting current A voltage is injected in the rotor circuit to reduce the motor speed by 40%. e. Calculate the magnitude of the injected voltage. f. Repeat (a) to (d) for the motor with injected voltage. g. Calculate the power delivered to the source of injected voltage.
Transcribed Image Text:Problem 5 A three-phase, 480 V, six-pole, Y-connected, 60 Hz, 10 kW induction motor is driving a constant torque load of 60 Nm. The parameters of the motor are: R₁ = 0.4 02, R₂ = 0.50 (actual rotor resistance), Xeq = 40, N₁ / N₂ = 2 (turn ratio between stator and rotor windings) Calculate the following: a. Motor torque. b. Motor current c. Starting torque d. Starting current A voltage is injected in the rotor circuit to reduce the motor speed by 40%. e. Calculate the magnitude of the injected voltage. f. Repeat (a) to (d) for the motor with injected voltage. g. Calculate the power delivered to the source of injected voltage.
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