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4-19- A 10-hp, 220-V, Y-connected, four-pole. 60-Hz three- phase induction motor draws a line current of 26.2 A at a pf of 0.78 lag when it operates at a slip of 5%. Rotational losses amount to 250 W. The motor is known to have the following parameters expressed in ohms per phase: ri: 0.3 2 Xi=X'=1,25 2 r=150 N X, =18 2 a-calculate the rotor current per phase referred to the stator. b-find the value of output horsepower. c-determine the efficiency

4-19- A 10-hp, 220-V, Y-connected, four-pole. 60-Hz three- phase induction motor draws a line current of 26.2 A at a pf of 0.78 lag when it operates at a slip of 5%. Rotational losses amount to 250 W. The motor is known to have the following parameters expressed in ohms per phase: ri: 0.3 2 Xi=X'=1,25 2 r=150 N X, =18 2 a-calculate the rotor current per phase referred to the stator. b-find the value of output horsepower. c-determine the efficiency

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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4-19- A 10-hp, 220-V, Y-connected, four-pole. 60-Hz three- phase induction motor draws a line current of 26.2 A at a pf of 0.78 lag when it operates at a slip of 5%. Rotational losses amount to 250 W. The motor is known to have the following parameters expressed in ohms per phase: ri: 0.3 2 Xi=X'=1,25 2 r=150 2 X, =18 2 a-calculate the rotor current per phase referred to the stator. b-find the value of output horsepower. c-determine the efficiency d-find the developed torque in N-m. e-calculate the starting line current at rated hne voltage.
Transcribed Image Text:4-19- A 10-hp, 220-V, Y-connected, four-pole. 60-Hz three- phase induction motor draws a line current of 26.2 A at a pf of 0.78 lag when it operates at a slip of 5%. Rotational losses amount to 250 W. The motor is known to have the following parameters expressed in ohms per phase: ri: 0.3 2 Xi=X'=1,25 2 r=150 2 X, =18 2 a-calculate the rotor current per phase referred to the stator. b-find the value of output horsepower. c-determine the efficiency d-find the developed torque in N-m. e-calculate the starting line current at rated hne voltage.
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