7)A separately excited dc motor controlled by a 3 phase full wave full controlled converter connected to the armature and field circuits. the ac supply voltage is 208v and the frequency is 60 Hz. If the field current adjusted to If 1 A and the armature resistance Ra = 0.2 0,the field resistance Rf = 250 n and the voltage constant K = 1.2V/A-rad/sec. The load torque TL=120 Nm and The firing angle of the armeture circuit adjusted to be aa=30. Consider armature inductance La is so large that the output current la can be assumed to be continuous and ripple-free. a) Draw the waveforms of the motor at firing angle a=30. b) Determine the developed torque and the motor speed. c) If the load is decreased by 20% calculate the motor speed. d) Determine the firing angle a to return the speed to its previous value as in case (b).

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...
icon
Related questions
Question
100%

Please solve all subdivisions please 

7)A separately excited dc motor controlled by a 3 phase full wave full controlled converter
connected to the armature and field circuits. the ac supply voltage is 208v and the
frequency is 60 Hz. If the field current adjusted to If =1 A and the armature resistance Ra
= 0.2 0, the field resistance Rf = 250 n and the voltage constant K = 1.2V/A-rad/sec. The
load torque TL=120 Nm and The firing angle of the armeture circuit adjusted to be aa=30.
Consider armature inductance La is so large that the output current la can be assumed to
be continuous and ripple-free.
a) Draw the waveforms of the motor at firing angle a=30.
b) Determine the developed torque and the motor speed.
c) If the load is decreased by 20% calculate the motor speed.
d) Determine the firing angle a to return the speed to its previous value as in case (b).
Transcribed Image Text:7)A separately excited dc motor controlled by a 3 phase full wave full controlled converter connected to the armature and field circuits. the ac supply voltage is 208v and the frequency is 60 Hz. If the field current adjusted to If =1 A and the armature resistance Ra = 0.2 0, the field resistance Rf = 250 n and the voltage constant K = 1.2V/A-rad/sec. The load torque TL=120 Nm and The firing angle of the armeture circuit adjusted to be aa=30. Consider armature inductance La is so large that the output current la can be assumed to be continuous and ripple-free. a) Draw the waveforms of the motor at firing angle a=30. b) Determine the developed torque and the motor speed. c) If the load is decreased by 20% calculate the motor speed. d) Determine the firing angle a to return the speed to its previous value as in case (b).
Expert Solution
steps

Step by step

Solved in 3 steps with 3 images

Blurred answer
Knowledge Booster
Basic Signals and Its Properties
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.
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,