<p>
Electrical Machines Nagrath Kothari</p>
<p>
1. Introduction 1<br />
1.1 Introduction 1<br />
1.2 Basic Principle, Types and Constructional Features of Electric Machines 3<br />
1.3 Recent Trends in Research and Developments in Electric Machines 7<br />
2. Magnetic Circuits and Induction 12<br />
2.1 Introduction 12<br />
2.2 Magnetic Circuits 12<br />
2.3 Magnetic Materials and Their Properties 25<br />
2.4 Magnetically Induced EMF and Force 27<br />
2.5 AC Operation of Magnetic Circuits 31<br />
2.6 Hysteresis and Eddy-Current Losses 33<br />
2.7 Permanent Magnets 35<br />
2.8 Application of Permanent Magnet Materials 40<br />
Summary 42<br />
Practice Problems 43<br />
Review Questions 47<br />
3. Transformers 48<br />
3.1 Introduction 48<br />
3.2 Transformer Construction and Practical Considerations 49<br />
3.3 Transformer on No-Load 54<br />
3.4 Ideal Transformer 58<br />
3.5 Real Transformer and Equivalent Circuit 62<br />
3.6 Transformer Losses 71<br />
3.7 Transformer Testing 72<br />
3.8 The Per Unit System 80<br />
3.9 Efficiency and Voltage Regulation 82<br />
3.10 Excitation Phenomenon in Transformers 91<br />
3.11 Autotransformers 94<br />
3.12 Variable Frequency Transformer 97<br />
viii Contents<br />
3.13 Three-Phase Transformers 101<br />
3.14 Parallel Operation of Transformers 116<br />
3.15 Three-Winding Transformers 120<br />
3.16 Phase Conversion 124<br />
3.17 Tap Changing Transformers 127<br />
3.18 Voltage and Current Transformers 131<br />
3.19 Audio-Frequency Transformer 135<br />
3.20 Grounding Transformer 136<br />
3.21 Welding Transformer 136<br />
3.22 Transformer as a Magnetically Coupled Circuit 137<br />
Summary 146<br />
Practice Problems 148<br />
Review Questions 156<br />
Multiple-Choice Questions 157<br />
4. Principles of Electromechanical Energy Conversion 158<br />
4.1 Introduction 158<br />
4.2 Energy in Magnetic System 158<br />
4.3 Field Energy and Mechanical Force 162<br />
4.4 Multiply-Excited Magnetic Field Systems 176<br />
4.5 Forces/Torques in Systems with Permanent Magnets 184<br />
4.6 Energy Conversion via Electric Field 187<br />
4.7 Dynamical Equations of Electromechanical Systems 190<br />
Summary 193<br />
Practice Problems 194<br />
Review Questions 196<br />
5. Basic Concepts in Rotating Machines 197<br />
5.1 Introduction 197<br />
5.2 Elementary Machines 198<br />
5.3 Generated EMF 205<br />
5.4 MMF of Distributed ac Windings 216<br />
5.5 Rotating Magnetic Field 223<br />
5.6 Torque in Round Rotor Machine 230<br />
5.7 Operation of Basic Machine Types 234<br />
5.8 Linear Machines 245<br />
5.9 Magnetic Leakage in Rotating Machines 247<br />
5.10 Losses and Efficiency 250<br />
5.11 Rating and Loss Dissipation 255<br />
5.12 Matching Characteristics of Electric Machine and Load 261<br />
Contents ix<br />
5.13 Resume 263<br />
Summary 263<br />
Practice Problems 266<br />
Review Questions 270<br />
Multiple-Choice Questions 272<br />
6. AC Armature Windings 273<br />
6.1 Introduction 273<br />
6.2 AC Windings 275<br />
Summary 283<br />
Practice Problems 283<br />
Review Questions 284<br />
7. DC Machines 285<br />
7.1 Introduction 285<br />
7.2 Armature Winding and Commutator 287<br />
7.3 Certain Observations 301<br />
7.4 EMF and Torque 301<br />
7.5 Circuit Model 305<br />
7.6 Armature Reaction 310<br />
7.7 Compensating Winding 316<br />
7.8 Commutation 318<br />
7.9 Methods of Excitation 322<br />
7.10 Operating Characteristics of dc Generator 326<br />
7.11 Self-Excitation 332<br />
7.12 Characteristics of dc Generators 335<br />
7.13 Shunt Generator&ndash;Predetermination of External Characteristic 339<br />
7.14 Parallel Operation of dc Generators 357<br />
7.15 Characteristics of dc Motors 361<br />
7.16 Starting of dc Motors 382<br />
7.17 Speed Control of dc Motors 390<br />
7.18 Braking of dc Motors 408<br />
7.19 Efficiency and Testing 410<br />
7.20 Testing of dc Machines 412<br />
7.21 DC Machine Dynamics 423<br />
7.22 Permanent Magnet dc (PMDC) Motors 426<br />
7.23 DC Machine Applications 430<br />
Summary 431<br />
Practice Problems 433<br />
Review Questions 441<br />
Multiple-Choice Questions 442<br />
x Contents<br />
8. Synchronous Machines 444<br />
8.1 Introduction 444<br />
8.2 Basic Synchronous Machine Model 445<br />
8.3 Circuit Model of Synchronous Machine 451<br />
8.4 Determination of the Synchronous Reactance 454<br />
8.5 MMF Method 462<br />
8.6 Determination of Armature Reaction Ampere-Turns and<br />
Leakage Reactance of a Synchronous Machine&mdash;Potier Method 465<br />
8.7 ASA (American Standards Association) Method (Latest) 473<br />
8.8 Nature of Armature Reaction 475<br />
8.9 Synchronizing to Infinite Bus-Bars 476<br />
8.10 Operating Characteristics 478<br />
8.11 Efficiency of Synchronous Machines 494<br />
8.12 Power Flow (Transfer) Equations 497<br />
8.13 Capability Curve of Synchronous Generator 518<br />
8.14 Salient-Pole Synchronous Machine Two-Reaction Model 521<br />
8.15 Staying in Synchronizm &ndash; The Synchronizing Power (Torque) 536<br />
8.16 Determination of XD And XQ &mdash;Slip Test 543<br />
8.17 Parallel Operation of Synchronous Generators 545<br />
8.18 Hunting in Synchronous Machines 549<br />
8.19 Starting of Synchronous Motors 554<br />
8.20 Short-Circuit Transient in Synchronous Machine 555<br />
8.21 Single-Phase Synchronous Generators 563<br />
8.22 Brushless DC Motors 575<br />
Summary 582<br />
Practice Problems 585<br />
Review Questions 590<br />
Multiple-Choice Questions 591<br />
9. Induction Machine 593<br />
9.1 Introduction 593<br />
9.2 Construction 593<br />
9.3 Flux and MMF Waves in Induction Motor&mdash;Principle of Operation 596<br />
9.4 Development of Circuit Model (Equivalent Circuit) 601<br />
9.5 Power Across Air-Gap, Torque and Power Output 605<br />
9.6 Tests to Determine Circuit-Model Parameters 614<br />
9.7 The Circle Diagram (Approximate) 630<br />
9.8 Starting 638<br />
9.9 Cogging and Crawling 645<br />
9.10 Speed Control 647<br />
9.11 Deep-Bar/Double-Cage Rotor 663<br />
Contents xi<br />
9.12 Classes of Squirrel-Cage Motors 666<br />
9.13 Induction Generator 667<br />
9.14 Induction Machine Dynamics: Acceleration Time 670<br />
9.15 Inverted Induction Machine 685<br />
9.16 High Efficiency Induction Motors 687<br />
9.17 Linear Induction Motor (LIM) 688<br />
Summary 691<br />
Practice Problems 694<br />
Review Questions 699<br />
Multiple-Choice Questions 701<br />
10. Fractional Kilowatt Motors 702<br />
10.1 Introduction 702<br />
10.2 Single-Phase Induction Motors 702<br />
10.3 Single-Phase Synchronous Motors 722<br />
10.4 Circuit Model of Single-Phase Induction Motor 725<br />
10.5 Balanced 2-Phase Motor Fed from Unbalanced Supply 734<br />
10.6 Stepper Motors 740<br />
10.7 Series Motor&mdash;Universal Motor 746<br />
Summary 751<br />
Practice Problems 752<br />
Review Questions 752<br />
11. Generalised Theory of Electrical Machines 753<br />
11.1 Introduction 753<br />
11.2 Convention 753<br />
11.3 Basic Two-Pole Machine 753<br />
11.4 Transformer with a Movable Secondary Winding 755<br />
11.5 Kron&rsquo;s Primitive Machine 757<br />
11.6 Linear Transformations in Machine 758<br />
11.7 Three-Phase to Two-Phase (a, b, c To a, b. 0) Transformation 761<br />
11.8 Rotating Axis (a, b. 0) to Stationary Axis (d, q, 0) Transformation 762<br />
11.9 Physical Concepts of Park&rsquo;s Transformation 765<br />
Review Questions 766<br />
12. Motor Control by Static Power Converters 767<br />
12.1 Introduction 767<br />
12.2 Solid State Devices 769<br />
12.3 Electrical Drives 782<br />
12.4 Power Converters 783<br />
12.5 Thyristor Motor Control 785</p>

Click Here Download : https://goo.gl/vEbPMI