Assume a dc motor with an armature resistance of R₁ = 0.23 . The magnetization curve (Eд vs. F) is as shown below. This motor is connected to a dc source of 240 V, and the related line current (I) is 100A. 1. Assume this motor is wired as a shunt de motor with a field winding of 2800 turns. a. If the field resistor is adjusted to 250 Ohms, find the motor speed at no-load. b. Find the speed of the motor at full load (us the rated IL). Then calculate the speed regulation (assume the same field resistance as Part (a)). c. Now assume the field resistance is adjusted to 350 Ohm. Find the motor speed at full load. Compare the results with Part(b). d. If the field resistance can be adjusted from 150 to 500 Ohms, find the maximum and minimum no-load speeds of the motor. e. Find the starting current. Compare this with the full-load current of the motor. 2. Assume the motor is connected as a series motor with Rs = 0.03 and N = 20 turns per pole. a. Find the full-load speed of the motor (same rated current as Problem1). b. Redo Part (a) but with Rs = 0.08 N. 3. Now assume the motor is connected as a cumulatively compound motor with series field resistance of Rs = 0.03 and shunt field resistance of R = 250 . Number of turns for series field winding (N) is 20 and for shunt field (NR) is 2800. a. Find the no-load speed of the motor. b. Find the full-load speed of the motor (use the same line current as Problem 1). c. Find the speed regulation. d. If the field resistance is now adjusted to 300 Ohm, find the motor speed at full-load and compare it with Part (b). EA (V) 300 250 200 150 100 50 50 n=1600 rpm m 0 0 1000 2000 3000 4000 5000 6000 F (A.turns)
Assume a dc motor with an armature resistance of R₁ = 0.23 . The magnetization curve (Eд vs. F) is as shown below. This motor is connected to a dc source of 240 V, and the related line current (I) is 100A. 1. Assume this motor is wired as a shunt de motor with a field winding of 2800 turns. a. If the field resistor is adjusted to 250 Ohms, find the motor speed at no-load. b. Find the speed of the motor at full load (us the rated IL). Then calculate the speed regulation (assume the same field resistance as Part (a)). c. Now assume the field resistance is adjusted to 350 Ohm. Find the motor speed at full load. Compare the results with Part(b). d. If the field resistance can be adjusted from 150 to 500 Ohms, find the maximum and minimum no-load speeds of the motor. e. Find the starting current. Compare this with the full-load current of the motor. 2. Assume the motor is connected as a series motor with Rs = 0.03 and N = 20 turns per pole. a. Find the full-load speed of the motor (same rated current as Problem1). b. Redo Part (a) but with Rs = 0.08 N. 3. Now assume the motor is connected as a cumulatively compound motor with series field resistance of Rs = 0.03 and shunt field resistance of R = 250 . Number of turns for series field winding (N) is 20 and for shunt field (NR) is 2800. a. Find the no-load speed of the motor. b. Find the full-load speed of the motor (use the same line current as Problem 1). c. Find the speed regulation. d. If the field resistance is now adjusted to 300 Ohm, find the motor speed at full-load and compare it with Part (b). EA (V) 300 250 200 150 100 50 50 n=1600 rpm m 0 0 1000 2000 3000 4000 5000 6000 F (A.turns)
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...
Related questions
Question
Transcribed Image Text:Assume a dc motor with an armature resistance of R₁ = 0.23 . The magnetization curve
(Eд vs. F) is as shown below. This motor is connected to a dc source of 240 V, and the related
line current (I) is 100A.
1. Assume this motor is wired as a shunt de motor with a field winding of 2800 turns.
a. If the field resistor is adjusted to 250 Ohms, find the motor speed at no-load.
b. Find the speed of the motor at full load (us the rated IL). Then calculate the speed
regulation (assume the same field resistance as Part (a)).
c. Now assume the field resistance is adjusted to 350 Ohm. Find the motor speed at full
load. Compare the results with Part(b).
d. If the field resistance can be adjusted from 150 to 500 Ohms, find the maximum and
minimum no-load speeds of the motor.
e. Find the starting current. Compare this with the full-load current of the motor.
2. Assume the motor is connected as a series motor with Rs = 0.03 and N = 20 turns per
pole.
a. Find the full-load speed of the motor (same rated current as Problem1).
b. Redo Part (a) but with Rs = 0.08 N.
3. Now assume the motor is connected as a cumulatively compound motor with series field
resistance of Rs = 0.03 and shunt field resistance of R = 250 . Number of turns for
series field winding (N) is 20 and for shunt field (NR) is 2800.
a. Find the no-load speed of the motor.
b. Find the full-load speed of the motor (use the same line current as Problem 1).
c. Find the speed regulation.
d. If the field resistance is now adjusted to 300 Ohm, find the motor speed at full-load and
compare it with Part (b).
Transcribed Image Text:EA (V)
300
250
200
150
100
50
50
n=1600 rpm
m
0
0
1000
2000
3000
4000
5000
6000
F (A.turns)
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
Recommended textbooks for you
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:
9780133923605
Author:
Robert L. Boylestad
Publisher:
PEARSON
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Programmable Logic Controllers
Electrical Engineering
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
Introductory Circuit Analysis (13th Edition)
Electrical Engineering
ISBN:
9780133923605
Author:
Robert L. Boylestad
Publisher:
PEARSON
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:
9781337900348
Author:
Stephen L. Herman
Publisher:
Cengage Learning
Programmable Logic Controllers
Electrical Engineering
ISBN:
9780073373843
Author:
Frank D. Petruzella
Publisher:
McGraw-Hill Education
Fundamentals of Electric Circuits
Electrical Engineering
ISBN:
9780078028229
Author:
Charles K Alexander, Matthew Sadiku
Publisher:
McGraw-Hill Education
Electric Circuits. (11th Edition)
Electrical Engineering
ISBN:
9780134746968
Author:
James W. Nilsson, Susan Riedel
Publisher:
PEARSON
Engineering Electromagnetics
Electrical Engineering
ISBN:
9780078028151
Author:
Hayt, William H. (william Hart), Jr, BUCK, John A.
Publisher:
Mcgraw-hill Education,