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Electric Motors and Drives - 4th Edition - ISBN: 9780080983325, 9780080993683

Electric Motors and Drives

4th Edition

Fundamentals, Types and Applications

Authors: Austin Hughes Bill Drury
Paperback ISBN: 9780080983325
eBook ISBN: 9780080993683
Imprint: Newnes
Published Date: 5th April 2013
Page Count: 440
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Electric Motors and Drives is intended for non-specialist users of electric motors and drives, filling the gap between maths- and theory-based academic textbooks and the more prosaic 'handbooks', which provide useful detail but little opportunity for the development of real insight and understanding. The book explores all of the widely-used modern types of motor and drive, including conventional and brushless D.C., induction motors and servo drives, providing readers with the knowledge to select the right technology for a given job.

The third edition includes additional diagrams and worked examples throughout. New topics include digital interfacing and control of drives, direct torque control of induction motors and current-fed operation in DC drives. The material on brushless servomotors has also been expanded.

Austin Hughes' approach, using a minimum of maths, has established Electric Motors and Drives as a leading guide for electrical engineers and mechanical engineers, and the key to a complex subject for a wider readership, including technicians, managers and students.

Key Features

  • Acquire knowledge of and understanding of the capabilities and limitations of motors and drives without struggling through unnecessary maths and theory
  • Updated material on the latest and most widely-used modern motors and drives, including brushless servomotors
  • New edition includes additional diagrams and worked examples throughout


Professional/student, Electrical engineering, Electrical and mechanical engineers and technicians requiring a working knowledge of motors and drives (but not a mathematical or academic level of knowledge), Students of electrical and mechanical engineering seeking an accessible introduction

Table of Contents

Chapter One. Electric Motors – The Basics

1. Introduction

2. Producing Rotation

3. Magnetic Circuits

4. Torque Production

5. Torque and Motor Volume

6. Energy Conversion – Motional E.M.F.

7. Equivalent Circuit

8. Constant Voltage Operation

9. General Properties of Electric Motors

Chapter Two. Introduction to Power Electronic Converters for Motor Drives

1. Introduction

2. Voltage Control – D.C. Output from D.C. Supply

3. D.C. from A.C. – Controlled Rectification

4. A.C. from D.C. – Inversion

5. A.C. from A.C.

6. Inverter Switching Devices

7. Converter Waveforms, Acoustic Noise, and Cooling

Chapter Three. Conventional D.C. Motors

1. Introduction

2. Torque Production

3. Motional E.M.F.

4. D.C. Motor – Steady-State Characteristics

5. Transient Behavior – Current Surges

6. Four Quadrant Operation and Regenerative Braking

7. Shunt and Series Motors

8. Self-Excited D.C. Machine

9. Toy Motors

Chapter Four. D.C. Motor Drives

1. Introduction

2. Thyristor D.C. Drives – General

3. Control Arrangements for D.C. Drives

4. Chopper-Fed D.C. Motor Drives

5. D.C. Servo Drives

6. Digitally Controlled Drives

Chapter Five. Induction Motors – Rotating Field, Slip and Torque

1. Introduction

2. The Rotating Magnetic Field

3. Torque Production

4. Influence of Rotor Current on Flux

5. Stator Current–Speed Characteristics

Chapter Six. Induction Motors – Operation from 50/60Hz Supply

1. Introduction

2. Methods of Starting Cage Motors

3. Run-Up and Stable Operating Regions

4. Torque–Speed Curves – Influence of Rotor Parameters

5. Influence of Supply Voltage on Torque–Speed Curve

6. Generating

7. Braking

8. Speed Control

9. Power-Factor Control and Energy Optimization

10. Single-Phase Induction Motors

11. Power Range

Chapter Seven. Variable Frequency Operation of Induction Motors

1. Introduction

2. Inverter-Fed Induction Motor Drives

3. Torque–Speed Characteristics

4. Introduction to Field-Oriented Control

5. Steady-State Torque Under Current-Fed Conditions

6. Torque vs Slip Frequency – Constant Rotor Flux Linkage

7. Dynamic Torque Control

8. Implementation of Field-Oriented Control

9. Direct Torque Control

Chapter Eight. Inverter-fed Induction Motor Drives

1. Introduction

2. Pulse-Width Modulated (PWM) Voltage Source Inverter (VSI)

3. Performance of Inverter-Fed Induction Motor Drives

4. Effect of Inverter Waveform and Variable Speed on the Induction Motor

5. Effect of the Inverter-Fed Induction Motor on the Utility Supply

6. Inverter and Motor Protection

7. Alternative Converter Topologies

Chapter Nine. Synchronous and Brushless Permanent Magnet Machines and Drives

1. Introduction

2. Synchronous Motors

3. Equivalent Circuits of Synchronous Motors

4. Operation From Constant-Voltage, Constant-Frequency (Utility) Supply

5. Variable-Frequency Operation

6. Synchronous Motor Drives

7. Performance of Brushless Motors

8. Reluctance and Hysteresis Motors

Chapter Ten. Stepping and Switched-reluctance Motors

1. Introduction

2. Stepping Motors

3. Principle of Motor Operation

4. Motor Characteristics

5. Steady-State Characteristics – Ideal (Constant-Current) Drive

6. Drive Circuits and Pull-Out Torque–Speed Curves

7. Transient Performance

8. Switched-Reluctance Motor Drives

Chapter Eleven. Motor/Drive Selection

1. Introduction

2. Power Ratings and Capabilities

3. Drive Characteristics

4. Load Requirements – Torque–Speed Characteristics

5. General Application Considerations

Appendix One. Introduction to Closed-loop Control

A1.1. Outline of Approach

A1.2. Closed-Loop (Feedback) Systems

A1.3. Steady-State Analysis of Closed-Loop Systems

Appendix Two. Induction Motor Equivalent Circuit

A2.1. Introduction

A2.2. The Ideal Transformer

A2.3. The Real Transformer

A2.4. Development of the Induction Motor Equivalent Circuit

A2.5. Properties of Induction Motors

A2.6. Performance Prediction – Example

A2.7. Approximate Equivalent Circuits

A2.8. Measurement of Induction Motor Parameters

A2.9. Equivalent Circuit Under Variable-Frequency Conditions


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© Newnes 2013
5th April 2013
Paperback ISBN:
eBook ISBN:

About the Authors

Austin Hughes

Austin Hughes was a long-time member of the innovative motors and drives research team at the University of Leeds, UK, and has established a reputation for an informal style that opens up complex subjects to a wide readership, including students and managers as well as technicians and engineers.

Affiliations and Expertise

Department of Electrical and Electronic Engineering, University of Leeds, UK

Bill Drury

Bill Drury is an independent consultant in power electronics, electrical machines and drives (PEMD). He has 45 years industrial PEMD experience - Siemens, Rolls-Royce and for 20 years Technical Director of Control Techniques. He is a Chartered Engineer and a Fellow of the Institution of Engineering and Technology (IET). He is a Visiting Professor of Innovation at Bristol University and a Visiting Professor at Newcastle University.

Affiliations and Expertise

Independent Consultant in Power Electronics


"This book is very readable, up-to-date and should be extremely useful to both users and o.e.m. designers. I unhesitatingly recommend it to any busy engineer who needs to make informed judgments about selecting the right drive system." --Drives and Controls

"A very useful reference book for anyone wanting a comprehensive understanding of motors and drives ... I have not seen another book which covers this wide subject more comprehensively and in such an easy-to-read style." --Silicon Chip, May 2006

"I would regard this book as a light but broad coverage of many motor and drive concepts that have been around a long time." --Dennis Feucht,

"The coverage of drive types and behaviors is thorough and up to date." --Electrical Apparatus, May 2006

Ratings and Reviews