Electric motors and drives : fundamentals, types and applications

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.

Author Notes

Austin Hughes, a respected teacher and long-time member of one of the world's most innovative motors and drives research teams at the University of Leeds, UK, has established a reputation for an informal style that opens up complex subjects to a wide readership, including managers and students, as well as technicians and engineers.
Bill Drury was the Executive VP of Technology at Emerson - Control Techniques for 18 years, where he still serves ns a Technical Advisor. He is a Visiting Professor at the Universities of Bristol and Newcastle, UK, and undertakes other work promoting innovation and education in power electronics, motors and drives.

Preface	p. ix
1 Electric Motors - The Basics	p. 1
1 Introduction	p. 1
2 Producing Rotation	p. 1
3 Magnetic Circuits	p. 7
4 Torque Production	p. 15
5 Torque and Motor Volume	p. 19
6 Energy Conversion - Motional E.M.F.	p. 24
7 Equivalent Circuit	p. 28
8 Constant Voltage Operation	p. 30
9 General Properties of Electric Motors	p. 36
2 Introduction to Power Electronic Converters for Motor Drives	p. 39
1 Introduction	p. 39
2 Voltage Control - D.C. Output from D.C. Supply	p. 41
3 D.C. from A.C. - Controlled Rectification	p. 50
4 A.C. from D.C. - Inversion	p. 59
5 A.C. from A.C.	p. 64
6 Inverter Switching Devices	p. 66
7 Converter Waveforms, Acoustic Noise, and Cooling	p. 68
3 Conventional D.C. Motors	p. 73
1 Introduction	p. 73
2 Torque Production	p. 75
3 Motional E.M.F.	p. 80
4 D.C. Motor - Steady-State Characteristics	p. 84
5 Transient Behavior - Current Surges	p. 95
6 Four Quadrant Operation and Regenerative Braking	p. 99
7 Shunt and Series Motors	p. 103
8 Self-Excited D.C. Machine	p. 108
9 Toy Motors	p. 110
4 D.C. Motor Drives	p. 113
1 Introduction	p. 113
2 Thyristor D.C. Drives - General	p. 113
3 Control Arrangements for D.C. Drives	p. 126
4 Chopper-Fed D.C. Motor Drives	p. 133
5 D.C. Servo Drives	p. 136
6 Digitally Controlled Drives	p. 139
5 Induction Motors - Rotating Field, Slip and Torque	p. 141
1 Introduction	p. 141
2 The Rotating Magnetic Field	p. 142
3 Torque Production	p. 154
4 Influence of Rotor Current on Flux	p. 163
5 Stator Current-Speed Characteristics	p. 165
6 Induction Motors - Operation from 50/60 Hz Supply	p. 169
1 Introduction	p. 169
2 Methods of Starting Cage Motors	p. 169
3 Run-Up and Stable Operating Regions	p. 176
4 Torque-Speed Curves - Influence of Rotor Parameters	p. 181
5 Influence of Supply Voltage on Torque-Speed Curve	p. 185
6 Generating	p. 187
7 Braking	p. 193
8 Speed Control	p. 195
9 Power-Factor Control and Energy Optimization	p. 198
10 Single-Phase Induction Motors	p. 199
11 Power Range	p. 203
7 Variable Frequency Operation of Induction Motors	p. 205
1 Introduction	p. 205
2 Inverter-Fed Induction Motor Drives	p. 207
3 Torque-Speed Characteristics	p. 209
4 Introduction to Field-Oriented Control	p. 215
5 Steady-State Torque Under Current-Fed Conditions	p. 226
6 Torque vs Slip Frequency - Constant Rotor Flux Linkage	p. 230
7 Dynamic Torque Control	p. 234
8 Implementation of Field-Oriented Control	p. 237
9 Direct Torque Control	p. 248
8 Inverter-fed Induction Motor Drives	p. 255
1 Introduction	p. 255
2 Pulse-Width Modulated (PWM) Voltage Source Inverter (VSI)	p. 255
3 Performance of Inverter-Fed Induction Motor Drives	p. 258
4 Effect of Inverter Waveform and Variable Speed on the Induction Motor	p. 262
5 Effect of the Inverter-Fed Induction Motor on the Utility Supply	p. 266
6 Inverter and Motor Protection	p. 272
7 Alternative Converter Topologies	p. 272
9 Synchronous and Brushless Permanent Magnet Machines and Drives	p. 281
1 Introduction	p. 281
2 Synchronous Motors	p. 282
3 Equivalent Circuits of Synchronous Motors	p. 287
4 Operation From Constant-Voltage, Constant-Frequency (Utility) Supply	p. 287
5 Variable-Frequency Operation	p. 292
6 Synchronous Motor Drives;	p. 300
7 Performance of Brushless Motors	p. 305
8 Reluctance and Hysteresis Motors	p. 311
10 Stepping and Switched-reluctance Motors	p. 315
1 Introduction	p. 315
2 Stepping Motors	p. 315
3 Principle of Motor Operation	p. 320
4 Motor Characteristics	p. 325
5 Steady-State Characteristics - Ideal (Constant-Current) Drive	p. 330
6 Drive Circuits and Pull-Out Torque-Speed Curves	p. 334
7 Transient Performance	p. 340
8 Switched-Reluctance Motor Drives	p. 343
11 Motor/Drive Selection	p. 349
1 Introduction	p. 349
2 Power Ratings and Capabilities	p. 349
3 Drive Characteristics	p. 350
4 Load Requirements - Torque-Speed Characteristics	p. 354
5 General Application Considerations	p. 360
Appendix 1 Introduction to Closed-loop Control	p. 365
Appendix 2 Induction Motor Equivalent Circuit	p. 383
Further Reading	p. 413
Index	p. 415

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