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Electric Machines and Drives

Electric Machines and Drives

          
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About the Book

This book is part of a three-book series. Ned Mohan has been a leader in EES education and research for decades, as author of the best-selling text/reference Power Electronics.   This book emphasizes applications of electric machines and drives that are essential for wind turbines and electric and hybrid-electric vehicles. The approach taken is unique in the following respects: A systems approach, where Electric Machines are covered in the context of the overall drives with applications that students can appreciate and get enthusiastic about; A fundamental and physics-based approach that not only teaches the analysis of electric machines and drives, but also prepares students for learning how to control them in a graduate level course; Use of the space-vector-theory that is made easy to understand. They are introduced in this book in such a way that students can appreciate their physical basis; A unique way to describe induction machines that clearly shows how they go from the motoring-mode to the generating-mode, for example in wind and electric vehicle applications, and how they ought to be controlled for the most efficient operation.

Table of Contents:
PREFACE xi CHAPTER 1 INTRODUCTION TO ELECTRIC DRIVE SYSTEMS 1 1.1 History 1 1.2 What Is an Electric-Motor Drive? 2 1.3 Factors Responsible for the Growth of Electric Drives 3 1.4 Typical Applications of Electric Drives 3 1.5 The Multi-Disciplinary Nature of Drive Systems 8 1.6 Structure of the Textbook 9 References 10 Problems 11 CHAPTER 2 UNDERSTANDING MECHANICAL SYSTEM REQUIREMENTS FOR ELECTRIC DRIVES 12 2.1 Introduction 12 2.2 Systems with Linear Motion 12 2.3 Rotating Systems 14 2.4 Friction 20 2.5 Torsional Resonances 21 2.6 Electrical Analogy 22 2.7 Coupling Mechanisms 23 2.8 Types of Loads 26 2.9 Four-Quadrant Operation 27 2.10 Steady State and Dynamic Operations 27 References 28 Problems 28 CHAPTER 3 REVIEW OF BASIC ELECTRIC CIRCUITS 31 3.1 Introduction 31 3.2 Phasor Representation in Sinusoidal Steady State 31 3.3 Three-Phase Circuits 38 Reference 43 Problems 43 CHAPTER 4 BASIC UNDERSTANDING OF SWITCH-MODE POWER ELECTRONIC CONVERTERS IN ELECTRIC DRIVES 46 4.1 Introduction 46 4.2 Overview of Power Processing Units (PPUs) 46 4.3 Converters for DC Motor Drives ð2Vd , vo , VdÞ 52 4.4 Synthesis of Low-Frequency AC 58 4.5 Three-Phase Inverters 59 4.6 Power Semiconductor Devices 62 References 66 Problems 66 CHAPTER 5 MAGNETIC CIRCUITS 69 5.1 Introduction 69 5.2 Magnetic Field Produced by Current-Carrying Conductors 69 5.3 Flux Density B and the Flux f 71 5.4 Magnetic Structures with Air Gaps 74 5.5 Inductances 76 5.6 Faraday’s Law: Induced Voltage in a Coil due to Time-Rate of Change of Flux Linkage 78 5.7 Leakage and Magnetizing Inductances 81 5.8 Transformers 83 5.9 Permanent Magnets 88 References 90 Problems 90 CHAPTER 6 BASIC PRINCIPLES OF ELECTROMECHANICAL ENERGY CONVERSION 92 6.1 Introduction 92 6.2 Basic Structure 92 6.3 Production of Magnetic Field 94 6.4 Basic Principles of Operation 96 6.5 Application of the Basic Principles 98 6.6 Energy Conversion 99 6.7 Power Losses and Energy Efficiency 101 6.8 Machine Ratings 102 References 103 Problems 103 CHAPTER 7 DC-MOTOR DRIVES AND ELECTRONICALLYCOMMUTATED MOTOR (ECM) DRIVES 108 7.1 Introduction 108 7.2 The Structure of DC Machines 109 7.3 Operating Principles of DC Machines 111 7.4 DC-Machine Equivalent Circuit 117 7.5 Various Operating Modes in DC-Motor Drives 119 7.6 Flux Weakening in Wound-Field Machines 122 7.7 Power-Processing Units in DC Drives 123 7.8 Electronically-Commutated Motor (ECM) Drives 123 References 129 Problems 129 CHAPTER 8 DESIGNING FEEDBACK CONTROLLERS FOR MOTOR DRIVES 132 8.1 Introduction 132 8.2 Control Objectives 132 8.3 Cascade Control Structure 135 8.4 Steps in Designing the Feedback Controller 135 8.5 System Representation for Small-Signal Analysis 136 8.6 Controller Design 138 8.7 Example of a Controller Design 139 8.8 The Role of Feed-Forward 145 8.9 Effects of Limits 145 8.10 Anti-Windup (Non-Windup) Integration 146 References 147 Problems and Simulations 147 CHAPTER 9 INTRODUCTION TO AC MACHINES AND SPACE VECTORS 149 9.1 Introduction 149 9.2 Sinusoidally-Distributed Stator Windings 149 9.3 The Use of Space Vectors to Represent Sinusoidal Field Distributions in the Air Gap 156 9.4 Space-Vector Representation of Combined Terminal Currents and Voltages 159 9.5 Balanced Sinusoidal Steady-State Excitation (Rotor Open-Circuited) 164 References 172 Problems 172 CHAPTER 10 SINUSOIDAL PERMANENT MAGNET AC (PMAC) DRIVES, LCI-SYNCHRONOUS MOTOR DRIVES, AND SYNCHRONOUS GENERATORS 174 10.1 Introduction 174 10.2 The Basic Structure of Permanent-Magnet AC (PMAC) Machines 175 10.3 Principle of Operation 175 10.4 The Controller and the Power-Processing Unit (PPU) 185 10.5 Load-Commutated-Inverter (LCI) Supplied Synchronous Motor Drives 186 10.6 Synchronous Generators 187 References 191 Problems 191 CHAPTER 11 INDUCTION MOTORS: BALANCED, SINUSOIDAL STEADY STATE OPERATION 193 11.1 Introduction 193 11.2 The Structure of Three-Phase, Squirrel-Cage Induction Motors 194 11.3 The Principles of Induction Motor Operation 194 11.4 Tests to Obtain the Parameters of the Per-Phase Equivalent Circuit 215 11.5 Induction Motor Characteristics at Rated Voltages in Magnitude and Frequency 216 11.6 Induction Motors of Nema Design A, B, C, and D 218 11.7 Line Start 219 11.8 Reduced Voltage Starting (“soft start”) of Induction Motors 220 11.9 Energy-Savings in Lightly-Loaded Machines 220 11.10 Doubly-Fed Induction Generators (DFIG) in Wind Turbines 221 References 228 Problems 229 CHAPTER 12 INDUCTION-MOTOR DRIVES: SPEED CONTROL 231 12.1 Introduction 231 12.2 Conditions for Efficient Speed Control Over a Wide Range 232 12.3 Applied Voltage Amplitudes to Keep ^ Bms 5 ^ Bms;rated 235 12.4 Starting Considerations in Drives 239 12.5 Capability to Operate below and above the Rated Speed 240 12.6 Induction-Generator Drives 242 12.7 Speed Control of Induction-Motor Drives 243 12.8 Pulse-Width-Modulated Power-Processing Unit 244 12.9 Reduction of ^ Bms at Light Loads 248 References 249 Problems 249 CHAPTER 13 RELUCTANCE DRIVES: STEPPER-MOTOR AND SWITCHED-RELUCTANCE DRIVES 250 13.1 Introduction 250 13.2 The Operating Principle of Reluctance Motors 251 13.3 Stepper-Motor Drives 253 13.4 Switched-Reluctance Motor Drives 259 References 260 Problems 260 CHAPTER 14 ENERGY EFFICIENCY OF ELECTRIC DRIVES AND INVERTER-MOTOR INTERACTIONS 261 14.1 Introduction 261 14.2 The Definition of Energy Efficiency in Electric Drives 261 14.3 The Energy Efficiency of Induction Motors with Sinusoidal Excitation 262 14.4 The Effects of Switching-Frequency Harmonics on Motor Losses 265 14.5 The Energy Efficiencies of Power-Processing Units 266 14.6 Energy Efficiencies of Electric Drives 266 14.7 The Economics of Energy Savings by Premium-Efficiency Electric Motors and Electric Drives 266 14.8 The Deleterious Effects of The PWM-Inverter Voltage Waveform on Motor Life 267 14.9 Benefits of Using Variable-Speed Drives 268 References 268 Problem 269


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Product Details
  • ISBN-13: 9781118074817
  • Publisher: John Wiley & Sons Inc
  • Publisher Imprint: John Wiley & Sons Inc
  • Depth: 13
  • Language: English
  • Returnable: N
  • Series Title: English
  • Sub Title: A First Course
  • Width: 180 mm
  • ISBN-10: 1118074815
  • Publisher Date: 31 Jan 2012
  • Binding: Hardback
  • Height: 257 mm
  • No of Pages: 288
  • Returnable: N
  • Spine Width: 18 mm
  • Weight: 590 gr


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