Problem 1 A 209-V, three-phase, six-pole, Y-connected induction motor has the following parameters: R1 = 0.128 Q, R'2 = 0.0935 Q, Xeg =0.490. The motor slip at full load is 2%. Assume that the motor load is a fan-type. If an external resistance equal to the rotor resistance is added to the rotor circuit, calculate the following: Problem 3 For the motor in Problem 1 and for a fan-type load, calculate the following if the voltage is reduced by 20%: a. Motor speed b. Starting torque c. Starting current d. Motor efficiency (ignore rotational and core losses)
Problem 1 A 209-V, three-phase, six-pole, Y-connected induction motor has the following parameters: R1 = 0.128 Q, R'2 = 0.0935 Q, Xeg =0.490. The motor slip at full load is 2%. Assume that the motor load is a fan-type. If an external resistance equal to the rotor resistance is added to the rotor circuit, calculate the following: Problem 3 For the motor in Problem 1 and for a fan-type load, calculate the following if the voltage is reduced by 20%: a. Motor speed b. Starting torque c. Starting current d. Motor efficiency (ignore rotational and core losses)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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b. Tstart = 71.93 Nm
c. Istart = 179.51 A
..
Transcribed Image Text:Problem 1
A 209-V, three-phase, six-pole, Y-connected induction motor has the following parameters:
R = 0.128 Q,
R'2 = 0.0935 N, Xeg =0.492.
The motor slip at full load is 2%. Assume that the motor load is a fan-type. If an external resistance equal
to the rotor resistance is added to the rotor circuit, calculate the following:
Problem 3
For the motor in Problem 1 and for a fan-type load, calculate the following if the voltage is reduced by 20%:
a. Motor speed
b. Starting torque
c. Starting current
d. Motor efficiency (ignore rotational and core losses)
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