A 140 V, DC shunt motor drives a constant-torque load at 1100 rpm speed. The armature and field resistances are 0.9 N and 155 N, respectively. The motor draws a line current of 10.5 A at the given load. Answer the following questions. 1- Calculate the resistance that should be added Radd 2 to the armature circuit to reduce the speed by 85%. Radd Radd 2- Calculate the efficiency of the motor without the added Radd SN if the rotational losses is M1 Vt equal to 147 W. n = % 3- Calculate the efficiency of the motor with the added Radd Nif the rotational losses is equal to 147 W. |% 4- Calculate the resistance that must be added to the armature circuit to operate the motor at the holding condition. Radd

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
A 140 V, DC shunt motor drives a constant-torque load at 1100 rpm speed. The armature and
field resistances are 0.9 2 and 155 N, respectively. The motor draws a line current of 10.5 A at
the given load. Answer the following questions.
1- Calculate the resistance that should be
added Radd N to the armature circuit to reduce
the speed by 85%.
Radd
Radd
Ω
2- Calculate the efficiency of the motor without
the added Radd N if the rotational losses is
M1
Vt
equal to 147 W.
%
T
Ea
3- Calculate the efficiency of the motor with the
added Radd Nif the rotational losses is equal to
147 W.
%
4- Calculate the resistance that must be added to the armature circuit to operate the motor at
the holding condition.
Radd
|||
Transcribed Image Text:A 140 V, DC shunt motor drives a constant-torque load at 1100 rpm speed. The armature and field resistances are 0.9 2 and 155 N, respectively. The motor draws a line current of 10.5 A at the given load. Answer the following questions. 1- Calculate the resistance that should be added Radd N to the armature circuit to reduce the speed by 85%. Radd Radd Ω 2- Calculate the efficiency of the motor without the added Radd N if the rotational losses is M1 Vt equal to 147 W. % T Ea 3- Calculate the efficiency of the motor with the added Radd Nif the rotational losses is equal to 147 W. % 4- Calculate the resistance that must be added to the armature circuit to operate the motor at the holding condition. Radd |||
Expert Solution
steps

Step by step

Solved in 5 steps with 10 images

Blurred answer
Knowledge Booster
Stepper Motor, Servo Motor and Reluctance Motor
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,