Homework Help is Here – Start Your Trial Now!
Engineering
Electrical Engineering
(12) A 3-phase, 4-pole, 440-V, 50-Hz slip-ring induction motor is started at full voltage uncoupled from its load. When a fixed external rotor resistance of value four times the rotor resistance itself is inserted at starting, the starting current and power factor are respectively 200 A and 0-6. The motor runs up to speed and the slip rings are then short circuited. On steady conditions being achieved the current and power factor become 12-5 A and 0-2. Assuming R1 (a) Estimate the maximum torque and the total external resistance, expressed n terms of the rotor resistance, required to get this torque at standstill with full voltage applied. © How much external rotor resistance would be reguired to double the patural b) What would be the line current if started from full voltage without external R2, rotor resistance? starting torque?

(12) A 3-phase, 4-pole, 440-V, 50-Hz slip-ring induction motor is started at full voltage uncoupled from its load. When a fixed external rotor resistance of value four times the rotor resistance itself is inserted at starting, the starting current and power factor are respectively 200 A and 0-6. The motor runs up to speed and the slip rings are then short circuited. On steady conditions being achieved the current and power factor become 12-5 A and 0-2. Assuming R1 (a) Estimate the maximum torque and the total external resistance, expressed n terms of the rotor resistance, required to get this torque at standstill with full voltage applied. © How much external rotor resistance would be reguired to double the patural b) What would be the line current if started from full voltage without external R2, rotor resistance? starting torque?

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...
See similar textbooks
icon
Related questions
Question
The subject is about Induction machines. Please, Solve the following question using circle diagram only.
(12) A 3-phase, 4-pole, 440-V, 50-Hz slip-ring induction motor is started at full voltage uncoupled from its load. When a fixed external rotor resistance of value four times the rotor resistance itself is inserted at starting, the starting current and power factor are respectively 200 A and 0-6. The motor runs up to speed and the slip rings are then short circuited. On steady conditions being achieved the current and power factor become 12-5 A and 0-2. Assuming R1 (a) Estimate the maximum torque and the total external resistance, expressed terms of the rotor resistance, required to get this torque at standstill with fun voltage applied. (b) What would be the line current if started from full voltage without external rotor resistance? Kiddr (c) How much external rotor resistance would be required to double the natural re 8 to th sp R2', 2. starting torque? (11)
Transcribed Image Text:(12) A 3-phase, 4-pole, 440-V, 50-Hz slip-ring induction motor is started at full voltage uncoupled from its load. When a fixed external rotor resistance of value four times the rotor resistance itself is inserted at starting, the starting current and power factor are respectively 200 A and 0-6. The motor runs up to speed and the slip rings are then short circuited. On steady conditions being achieved the current and power factor become 12-5 A and 0-2. Assuming R1 (a) Estimate the maximum torque and the total external resistance, expressed terms of the rotor resistance, required to get this torque at standstill with fun voltage applied. (b) What would be the line current if started from full voltage without external rotor resistance? Kiddr (c) How much external rotor resistance would be required to double the natural re 8 to th sp R2', 2. starting torque? (11)
Expert Solution
steps

Step by step

Solved in 5 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Knowledge Booster
Antenna array
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:
9780133923605
Author:
Robert L. Boylestad
Publisher:
PEARSON
Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Programmable Logic Controllers
Programmable Logic Controllers
Electrical Engineering
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
Fundamentals of Electric Circuits
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:
9780078028229
Author:
Charles K Alexander, Matthew Sadiku
Publisher:
McGraw-Hill Education
Electric Circuits. (11th Edition)
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:
9780134746968
Author:
James W. Nilsson, Susan Riedel
Publisher:
PEARSON
Engineering Electromagnetics
Engineering Electromagnetics
Electrical Engineering
ISBN:
9780078028151
Author:
Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:
Mcgraw-hill Education,
SEE MORE TEXTBOOKS