Electric Motors Drives

✍ Scribed by Austin Hughes

• Publisher: Newnes
• Year: 2006
• Tongue: English
• Leaves: 431
• Edition: 3rd
• Category: Library

✦ Synopsis

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. * 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

✦ Table of Contents

Front Cover......Page 1
Electric Motors and Drives......Page 4
Copyright Page......Page 5
CONTENTS......Page 6
Preface......Page 17
Introduction......Page 22
Producing Rotation......Page 23
Magnetic Circuits......Page 28
Torque Production......Page 37
Specific Loadings and Specific Output......Page 42
Energy Conversion – Motional EMF......Page 46
Equivalent Circuit......Page 51
General Properties of Electric Motors......Page 60
Review Questions......Page 63
Introduction......Page 66
Voltage Control – D.C. Output from D.C. Supply......Page 68
D.C. from A.C. – Controlled Rectification......Page 76
A.C. from D.C. SP – SP Inversion......Page 86
Inverter Switching Devices......Page 93
Cooling of Power Switching Devices......Page 96
Review Questions......Page 100
Introduction......Page 103
Torque Production......Page 105
Motional E.M.F......Page 111
D.C. motor – Steady-State Characteristics......Page 116
Transient Behaviour – Current Surges......Page 128
Shunt, Series and Compound Motors......Page 132
Four-Quadrant Operation and Regenerative Braking......Page 140
Toy Motors......Page 145
Review Questions......Page 147
Introduction......Page 154
Thyristor D.C. Drives – General......Page 155
Control Arrangements for D.C. Drives......Page 169
Chopper-Fed D.C. Motor Drives......Page 176
D.C. Servo Drives......Page 180
Digitally Controlled Drives......Page 184
Review Questions......Page 185
Introduction......Page 188
The Rotating Magnetic Field......Page 191
Torque Production......Page 204
Influence of Rotor Current on Flux......Page 212
Stator Current-Speed Characteristics......Page 214
Review Questions......Page 217
Methods of Starting Cage Motors......Page 219
Run-up and Stable Operating Regions......Page 227
Torque–Speed Curves – Influence of Rotor Parameters......Page 232
Influence of Supply Voltage on Torque–Speed Curve......Page 238
Generating and Braking......Page 239
Speed Control......Page 242
Power Factor Control and Energy Optimisation......Page 246
Single-Phase Induction Motors......Page 248
Size Range......Page 253
Review Questions......Page 254
Introduction......Page 257
Similarity Between Induction Motor and Transformer......Page 259
The Ideal Transformer......Page 261
The Real Transformer......Page 269
Development of the Induction Motor Equivalent Circuit......Page 279
Properties of Induction Motors......Page 282
Performance Prediction – Example......Page 284
Approximate Equivalent Circuits......Page 288
Equivalent Circuit Under Variable-Frequency Conditions......Page 295
Review Questions......Page 298
Introduction......Page 300
Torque–Speed Characteristics – Constant V/f Operation......Page 307
Control Arrangements for Inverter-Fed Drives......Page 311
Vector (Field-Oriented) Control......Page 317
Cycloconverter Drives......Page 321
Review Questions......Page 324
Introduction......Page 326
Principle of Motor Operation......Page 332
Motor Characteristics......Page 339
Steady-State Characteristics – Ideal (Constant-Current) Drive......Page 345
Drive Circuits and Pull-Out Torque–Speed Curves......Page 349
Transient Performance......Page 356
Review Questions......Page 359
Introduction......Page 361
Synchronous Motors......Page 362
Controlled-Speed Synchronous Motor Drives......Page 373
Brushless D.C. Motors......Page 378
Switched Reluctance Motor Drives......Page 379
Review Questions......Page 384
Power Range for Motors and Drives......Page 387
Load Requirements – Torque–Speed Characteristics......Page 390
General Application Considerations......Page 396
Review Questions......Page 400
Reasons for Adopting a Simplified Approach......Page 402
Closed-Loop (Feedback) Systems......Page 403
Steady-State Analysis of Closed-Loop Systems......Page 407
Importance of Loop Gain – Example......Page 411
Steady-State Error – Integral Control......Page 413
PID Controller......Page 415
Stability......Page 417
Disturbance Rejection – Example Using D.C. Machine......Page 418
Further Reading......Page 421
Answers to Numerical Review Questions......Page 422
Index......Page 425

✦ Subjects

Топливно-энергетический комплекс;Электропривод;