Page 16 - Electric Machinery Fundamentals

'i TABLE OF CONTENTS

Chapter 7 DC Machinery Fundamentals 404
7.1 A Simple Rotating Loop between Curved Pole Faces 404
The Voltage Induced in a RotaTing Loop / Gelting DC
Voltage Our of the Rotating Loop / The Induced Torque ;11
the ROlating Loop
7.2 Commutation in a Simple Four-Loop DC Machine 416
7.3 Commutation and Armature Construction in Real
DC Machines 421
The ROlor Coils / Connections to the CommlltCltor
Segments / The Lap Winding / The Wave Windillg / The
Frog-Leg Winding
7.4 Problems with Commutation in Real Machines 433
Armature Reaction / L di/dt VoLtages / Solutions 10 the
Problems with Commutation
7.5 The [nterna] Generated Voltage and Induced Torque
Equations of Rea] DC Machines 445
7.6 The Construction of DC Machines 449
Pole alld Frame Construction / Rotor or Armature
Cons/ruction / Commutator and Bmshes / Winding
Insularion
7.7 Power FJow and Losses in DC Machines 455
The Losses in DC Machines / The Power-Flow Diagram
7.8 Summary 458
Questions 458
Problems 458
References 461

Chapter 8 DC Motors and Generators 464
8.1 Introduclion to DC Motors 465
8.2 The Equivalent Circuit of a DC Motor 467
8.3 The Magnetization Curve of a DC Machine 468
8.4 Separately Excited and Shunt DC Motors 469
The Terminal Characteristic of a Shunt DC Molor /
Nonlinear Analysis of a Shullt DC MOlOr / Speed Control
of Shunt DC MOlars / The Effect of an Open Field Circuit
8.5 The Pennaoent-Magnet DC Motor 491
8.6 The Series DC Motor 493
Induced Torque ill a Series DC Motor / The Terminal
Characteristic oj a Series DC Motor / Speed Control oj
Series DC MOLOrs