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:

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 13RQ: A squirrel-cage induction motor is operating at 1175 RPM and producing a torque of 22 Ib-ft. What is...
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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 = 402, N₁ / N₂ = 2
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 = 402, N₁ / N₂ = 2 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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