Electrical Machines-I (Th.) | (ET-215) | (Section-A)

This course is intended to provide a basic introduction to the theory of magnetic circuits linked with transformers and rotating electrical machines. The principles of electromechanical energy conversion will be discussed in the context of DC machines. An in-depth analysis of DC generators and motors will be carried out for different characteristics.

Prerequisite: NIL

Catalog Data:             Course Code:                         ET-215

                                    Course Title:                           Electrical Machines-I (Th.)

                                    Credit Hours:                          3

                                    Course Designation:               Engineering Technology Foundation

                                    No of Sessions per week:       1 (Total 16 sessions)

                                    Session Duration:                   180 min

                                    Time of Class Meeting:           11:00 AM to 02:00 PM (Monday)

Program Learning Outcome: 

This course is designed in conjunction with the following PLOs.

PLO 1. Engineering Knowledge: An ability to apply knowledge of mathematics, science, engineering fundamentals and an engineering specialization to the solution of complex engineering problems.

PLO 2. Problem Analysis: An ability to identify, formulate, research literature, and analyze complex engineering problems reaching substantiated conclusions using first principles of mathematics, natural sciences and engineering sciences.

Course Learning Outcome (CLO):

Upon successful completion of this course, the student will be able to:

CLO 1. Apply the concepts of magnetic circuits for the performance evaluation of electrical machines [Cognitive-Level 3 (Applying)]

CLO 2. Evaluate the operation and characteristics of DC machines. [Cognitive-Level 5 (Evaluating)]

CLO 3. Analyze the performance of transformers and three-phase machines. [Cognitive-Level 5 (Evaluating)]

Textbook:

  1. Stephen J. Chapman “Electric Machinery Fundamental”, 5th Edition, McGraw- Hill International Edition.

References:                 

  1. A.E. Fitzgerald, “Electric Machinery”, 6th Edition, McGraw-Hill International Edition.
  2. Charles I. HUBERT, “Electric Machines: Theory, Operating Applications, and Controls”, 2nd Edition, Prentice Hall, 2001.
  3. J. R. Hendershot Jr. and T. J. E Miller, “Design of Brushless Permanent-Magnet Motors”, 1994
  4. Hindmarsh, “Electrical Machines”, McGraw-Hill. (Latest Edition)

Evaluation Criteria:   

  1. Assignments                           10%
  2. Quizzes                                   10%
  3. Mid-Term Exam                       30%
  4. Viva                                         25%
  5. Final Exam                              25%

COURSE DISTRIBUTION ON WEEKLY BASIS

 

Weeks

Topics

Quiz/ Assignment

WEEK 01 TO WEEK 05

Introduction to Magnetic Circuits

CLO-1

Chapter 1

(Chapman & Fitzgerald)

WEEK 06

DC Generator: Construction, Types of DC generators, separately excited generator,   shunt generator, voltage build-up phenomenon, series generator, compounded generator and its type; under compounded, over compounded and flat compounded generator, terminal characteristics of all the generators.

CLO-2

(Chapman 7.3, 7.4 and Lecture Notes)

 

 

Assignment 1

WEEK 07

Armature Reaction: Concept of magnetic and magnetic neutral axis, placement of carbon brushes, armature reaction and its causes, components of armature reaction, effects of armature reaction, remedies for armature reaction (compensating winding, flux enhancement and brush shifting).

CLO-2

(Chapman 7.4 and Lecture Notes)

 

 

Quiz 1

WEEK 08

Commutation: One Commutation process, commutation time, ideal commutation, poor   commutation, effects of poor   commutation, practical difficulties, Ldi/dt effect, interpoles, function of interpoles.

Losses: Different types of losses and their formulation, power flow diagram of motor and generator, calculation of maximum efficiency, calculation of losses at different loads circuit.

CLO-2

(Chapman 7.4, 7.7 and Lecture Notes)

WEEK 08

Mid-Term

CLO1-CLO2

WEEK 09 to WEEK 10

DC Motors: Working principle, construction and operation, different types of DC motors, Back e.m.f equation, torque equation, terminal characteristics of separately excited and shunt type DC motor. Series and parallel combinations

CLO-2

(Chapman 8.1 to 8.4)

WEEK 11

Speed Control of DC Motor: Base speed, speed control of DC motors especially shunt type and separately excited machine, voltage control method, field current control method, effects of open field, permanent magnet machines.

CLO-2

 (Chapman 8.4 to 8.5)

WEEK 11

DC series motor: Expression for torque, applications, terminal characteristics, methods for speed control.

CLO-2

 (Chapman 8.6)

WEEK 12 to WEEK 13

Transformer: Basic principal and operation, types and construction, applications, ideal and practical transformer and their comparison; voltage and current transformation,   impedance matching, dot convention.

CLO-3

(Chapman 2.1 to 2.4)

WEEK 14

Auto Transformers: Basic principle, construction and working, voltage and current relationship, apparent power rating advantage of auto transformers.

Three phase transformers: Types, ratings, different type of connections.

CLO-3

(Chapman 2.9 and Lecture Notes)

WEEK 15

Losses: Different types of losses and their formulation, power flow diagram of motor and generator, calculation of maximum efficiency, calculation of losses at different loads circuit.

CLO-2

(Chapman 7.4, 7.7 and Lecture Notes)

WEEK 16

Transformer Tests and Voltage Regulations: Open circuit Test and calculations of magnetizing branch parameters, short circuit test and calculation of impedance, Voltage regulation, reasons of voltage drops, and voltage regulation under different load conditions.

CLO-3

(Fitzgerald 2.5 and Chapman 2.7 and 2.8)

 

WEEK 17

Revision

 

WEEK 18

Final Examination

CLO-1 to CLO-3

Course Material

Other Courses by Engr. Muhammad Waqar Zahid