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Electric Machines By DP Kothari and IJ Nagrath

Book Summary

Electric Machines By DP Kothari and IJ Nagrath now in its 5″ edition, is intended for third and fourth year UG students and first-year PG students of electrical engineering-updated with latest scientific advancements. The changes are made keeping the original flavor of the book intact, that is, in-depth coverage of fundamental concepts. This edition contains plethora of solved examples, competitive examination based MCQs and MATLAB examples to enhance problem-solving skills. Electric Machines By DP Kothari and IJ Nagrath can be used as a quick reference by practicing engineers and is also useful to lAS, IES, GATE and other entrance and job examination aspirants preparing for the subject.

Electric Machines By DP Kothari and IJ Nagrath is designed to supplement textbooks on electric machines; the book presents basic concepts, techniques and services relating to electric machines through a series of carefully formulated solved examples, review questions and objective questions. Electrical MCQ Question and Answer for Electrical competitive exam.

Salient features

  • Contains detailed answers to the concept review questions;
  • A conceptual review which includes a summary of basic definitions and principles along with relevant equations and formulae;
  • Well – illustrated with over 250 drawings to enable conceptual clarity;
  • This book has 290 review questions with answers, 405 objective questions, 355 solved examples and supplementary questions;
  • Appendix having review material for preparation of vivas and interviews.

Book Name – Basic Electrical & Electronics Engineering By JB Gupta
Author – DP Kothari and IJ Nagrath
Publisher – Mcgraw Hill
Language – English
Edition – 5th, 2017
Paperback – 1000 Pages

Book Contents

  1. Introduction
  2. Magnetic Circuits and Induction 
  3. Transformers
  4. Principles of Electromechanical Energy Conversion
  5. Basic Concepts in Rotating Machines
  6. AC Armature Windings
  7. DC Machines
  8. Synchronous Machines
  9. Induction Machine
  10. Fractional Kilowatt Motors
  11. Generalised Theory of Electrical Machines
  12. Motor Control by Static Power Converters

1. Introduction

1.2 Basic Principle, Types and Constructional Features of Electric Machines
1.3 Recent Trends in Research and Developments in Electric Machines

2. Magnetic Circuits and Induction

2.1 Introduction
2.2 Magnetic Circuits
2.3 Magnetic Materials and Their Properties
2.4 Magnetically Induced EMF and Force
2.5 AC Operation of Magnetic Circuits
2.6 Hysteresis and Eddy-Current Losses
2.7 Permanent Magnets
2.8 Application of Permanent Magnet Materials
practice Problems
Review Questions

3. Transformers

3.1 Introduction
3.2 Transformer Construction and Practical Considerations
3.3 Transformer on No-Load
3.4 Ideal Transformer
3.5 Real Transformer and Equivalent Circuit
3.6 Transformer Losses
3.7 Transformer Testing
3.8 The Per Unit System
3.9 Efficiency and Voltage Regulation
3.10 Excitation Phenomenon in Transformers
3.11 Autotransformers
3.12 Variable Frequency Transformer
3.13 Three-Phase Transformers
3.14 Parallel Operation of Transformers
3.15 Three-Winding Transformers
3.16 Phase Conversion
3.17 Tap Changing Transformers
3.18 Voltage and Current Transformers
3.19 Audio-Frequency Transformer
3.20 Grounding Transformer
3.21 Welding Transformer
3.22 Transformer as a Magnetically Coupled Circuit
Practice Problems
Review Questions
Multiple-Choice Questions

4. Principles of Electromechanical Energy Conversion

4.1 Introduction
4.2 Energy in Magnetic System
4.3 Field Energy and Mechanical Force
4.4 Multiply-Excited Magnetic Field Systems
4.5 Forces/Torques in Systems with Permanent Magnets
4.6 Energy Conversion via Electric Field
4.7 Dynamical Equations of Electromechanical Systems
Practice Problems
Review Questions

5. Basic Concepts in Rotating Machines

5.1 Introduction
5.2 Elementary Machines
5.3 Generated EMF
5.4 MMF of Distributed ac Windings
5.5 Rotating Magnetic Field
5.6 Torque in Round Rotor Machine
5.7 Operation of Basic Machine Types
5.8 Linear Machines
5.9 Magnetic Leakage in Rotating Machines
5.10 Losses and Efficiency
5.11 Rating and Loss Dissipation
5.12 Matching Characteristics of Electric Machine and Load
5.13 Resume
Practice Problems
Review Questions
Multiple-Choice Questions

6. AC Armature Windings

6.1 Introduction
6.2 AC Windings
Practice Problems
Review Questions

7. DC Machines

7.1 Introduction
7.2 Armature Winding and Commutator
7.3 Certain Observations
7.4 EMF and Torque
7.5 Circuit Model
7.6 Armature Reaction
7.7 Compensating Winding
7.8 Commutation
7.9 Methods of Excitation
7.10 Operating Characteristics of dc Generator
7.11 Self-Excitation
7.12 Characteristics of dc Generators
7.13 Shunt Generator–Predetermination of External Characteristic
7.14 Parallel Operation of dc Generators
7.15 Characteristics of dc Motors
7.16 Starting of dc Motors
7.17 Speed Control of dc Motors
7.18 Braking of dc Motors
7.19 Efficiency and Testing
7.20 Testing of dc Machines
7.21 DC Machine Dynamics
7.22 Permanent Magnet dc (PMDC) Motors
7.23 DC Machine Applications
Practice Problems
Review Questions
Multiple-Choice Questions

8. Synchronous Machines

8.1 Introduction
8.2 Basic Synchronous Machine Model
8.3 Circuit Model of Synchronous Machine
8.4 Determination of the Synchronous Reactance
8.5 MMF Method
8.6 Determination of Armature Reaction Ampere-Turns and Leakage Reactance of a Synchronous Machine—Potier Method
8.7 ASA (American Standards Association) Method (Latest)
8.8 Nature of Armature Reaction
8.9 Synchronizing to Infinite Bus-Bars
8.10 Operating Characteristics
8.11 Efficiency of Synchronous Machines
8.12 Power Flow (Transfer) Equations
8.13 Capability Curve of Synchronous Generator
8.14 Salient-Pole Synchronous Machine Two-Reaction Model
8.15 Staying in Synchronizm – The Synchronizing Power (Torque)
8.16 Determination of XD And XQ —Slip Test
8.17 Parallel Operation of Synchronous Generators
8.18 Hunting in Synchronous Machines
8.19 Starting of Synchronous Motors
8.20 Short-Circuit Transient in Synchronous Machine
8.21 Single-Phase Synchronous Generators
8.22 Brushless DC Motors
Practice Problems
Review Questions
Multiple-Choice Questions

9. Induction Machine

9.1 Introduction
9.2 Construction
9.3 Flux and MMF Waves in Induction Motor—Principle of Operation
9.4 Development of Circuit Model (Equivalent Circuit)9.5 Power Across Air-Gap, Torque and Power Output
9.6 Tests to Determine Circuit-Model Parameters
9.7 The Circle Diagram (Approximate)
9.8 Starting
9.9 Cogging and Crawling
9.10 Speed Control
9.11 Deep-Bar/Double-Cage Rotor
9.12 Classes of Squirrel-Cage Motors
9.13 Induction Generator
9.14 Induction Machine Dynamics: Acceleration Time
9.15 Inverted Induction Machine
9.16 High-Efficiency Induction Motors
9.17 Linear Induction Motor (LIM)
Practice Problems
Review Questions
Multiple-Choice Questions

10. Fractional Kilowatt Motors

10.1 Introduction
10.2 Single-Phase Induction Motors
10.3 Single-Phase Synchronous Motors
10.4 Circuit Model of Single-Phase Induction Motor
10.5 Balanced 2-Phase Motor Fed from Unbalanced Supply
10.6 Stepper Motors
10.7 Series Motor—Universal Motor
Practice Problems
Review Questions

11. Generalized Theory of Electrical Machines

11.1 Introduction
11.2 Convention
11.3 Basic Two-Pole Machine
11.4 Transformer with a Movable Secondary Winding
11.5 Kron’s Primitive Machine
11.6 Linear Transformations in Machine
11.7 Three-Phase to Two-Phase (a, b, c To a, b. 0) Transformation
11.8 Rotating Axis (a, b. 0) to Stationary Axis (d, q, 0) Transformation
11.9 Physical Concepts of Park’s Transformation
Review Questions

12. Motor Control by Static Power Converters

12.1 Introduction
12.2 Solid State Devices
12.3 Electrical Drives
12.4 Power Converters
12.5 Thyristor Motor Control
12.6 DC Motor Control Through Converters
12.7 DC Motor Control Through Choppers
12.8 Converter Topologies for dc Motor Drives
12.9 AC Motor Control
12.10 Inverters
12.11 Forced Commutation
12.12 Vector Control of an Induction Motor
Practice Problems
Review Questions
Multiple-Choice Questions

Appendix I: AC Steady-State Circuit Analysis
Appendix II: Three-Phase Systems
Appendix III: Special Topics in Transformers
Appendix IV: Cross-Field Machines
Appendix V: AC Commutator Machines
Appendix VI: Resistance
Appendix VII: Sample Examples Solved Using Matlab
Appendix VIII: Table of Constants and Unit Conversion
Answers to Problems

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