Electric Drives and Electromechanical Systems - 1st Edition - ISBN: 9780750667401, 9780080492643

Electric Drives and Electromechanical Systems

1st Edition

Applications and Control

Authors: Richard Crowder
Paperback ISBN: 9780750667401
eBook ISBN: 9780080492643
Imprint: Newnes
Published Date: 25th January 2006
Page Count: 312
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The focus of this book on the selection and application of electrical drives and control systems for electromechanical and mechatronics applications makes it uniquely useful for engineers in industry working with machines and drives. It also serves as a student text for courses on motors and drives, and engineering design courses, especially within mechanical engineering and mechatronics degree programs.

The criteria for motor-drive selection are explained, and the main types of drives available to drive machine tools and robots introduced. The author also provides a review of control systems and their application, including PLCs and network technologies. The coverage of machine tools and high-performance drives in smaller applications makes this a highly practical book focused on the needs of students and engineers working with electromechanical systems.

Key Features

  • An invaluable survey of electric drives and control systems for electromechanical and mechatronics applications
  • Essential reading for electrical and mechanical engineers using motors and drives
  • An ideal electric motors and drives text for university courses including mechatronics


A wide spectrum of users of electrical motors, drives and machines: electrical engineers, mechanical engineers, manufacturing engineers... Secondary market as a module text where courses focus on electromechanical systems and high performance drives.

Table of Contents

1 Electromechanical Systems 1.1 Principles of automation 1.2 Machine tools 1.2.1 Conventional machining processes 1.2.2 Non-conventional machining 1.2.3 Machining centers 1.3 Robots 1.3.1 Industrial robots 1.3.2 Robotic hands 1.3.3 Mobile robotics 1.3.4 Legged robots 1.4 Other applications 1.4.1 Automotive applications 1.4.2 Aerospace applications 1.5 Motion-control systems 1.6 Summary

2 Analysing a drive system 2.1 Rotary systems 2.1.1 Fundamental relationships 2.1.2 Torque considerations 2.1.3 Gear ratios 2.1.4 Acceleration without an external load 2.1.5 Acceleration with an applied external load 2.1.6 Accelerating loads with variable inertias 2.2 Linear systems 2.3 Friction 2.4 Motion profiles 2.5 Assessment of a motor-drive system 2.5.1 Mechanical compatibility 2.5.2 Electromagnetic compatibility 2.5.3 Wiring considerations 2.5.4 Supply considerations 2.5.5 Protection from the environment 2.5.6 Drive hazards and risk 2.6 Summary

3 Power transmission and sizing 3.1 Gearboxes 3.1.1 Planetary gearbox 3.1.2 Harmonic gearbox 3.1.3 Cycloid gearbox 3.2 Lead and ball screws 3.3 Belt drives 3.4 Bearings 3.4.1 Conventional bearings 3.4.2 Air bearings 3.4.3 Magnetic bearings 3.5 Couplings 3.6 Shafts 3.6.1 Static behavior of shafts 3.6.2 Transient behavior of shafts 3.7 Linear drives 3.8 Review of motor-drive sizing 3.8.1 Continuous duty 3.8.2 Intermittent duty 3.8.3 Inability to meet both the speed and the torque requirements 3.8.4 Linear motor sizing 3.9 Summary

4 Velocity and position transducers 4.1 The performance of measurement systems 4.1.1 Random errors 4.1.2 Systematic errors 4.1.3 Digital-system errors 4.1.4 Analogue-digital and digital-analogue conversion errors 4.1.5 Dynamic performance 4.2 Rotating velocity transducers 4.2.1 Brushed d.c. tachogenerators 4.2.2 Brushless d.c. tachogenerators 4.2.3 Incremental systems 4.2.4 Electromechanical pulse encoders 4.3 Position transducers 4.3.1 Brushed potentiometers 4.3.2 Linear variable differential transformers - LVDT 4.3.3 Resolvers 4.3.4 Rotary and linear Inductosyn 4.3.5 Optical position sensors 4.4 Application of position and velocity transducers 4.4.1 Mechanical installation 4.4.2 Electrical interconnection 4.4.3 Determination of datum position 4.5 Summary

5 Brushed direct-current motors 5.1 Review of motor theory 5.2 Direct-current motors 5.2.1 Ironless-rotor motors 5.2.2 Iron-rotor motors 5.2.3 Torque motors 5.2.4 Printed-circuit motors 5.3 Drives for d.c. brushed motors 5.3.1 Four-quadrant thyristor converters 5.3.2 Linear amplifiers 5.3.3 Pulse width modulated servo drives 5.3.4 Analysis of the bipolar PWM amplifier 5.3.5 PWM amplifiers 5.4 Regeneration 5.5 Summary

6 Brushless motors and controllers 6.1 The d.c. brushless motor 6.1.1 Torque-speed characteristics 6.1.2 Brushless d.c. motor controllers 6.2 Sinewave-wound brushless motors 6.2.1 Torque characteristics 6.2.2 Voltage characteristics 6.2.3 Torque-speed characteristics 6.2.4 Control of sinewave-wound brushless motors 6.3 Linear motors 6.4 Summary

7 Induction motors 7.1 Induction motor characteristics 7.2 Scalar control 7.3 Vector control 7.3.1 Vector control principles 7.3.2 Implementation of vector control 7.3.3 Vector Control using sensors 7.3.4 Sensorless Vector Control 7.4 Matrix Converter 7.5 Summary

8 Stepper motors 8.1 Principles of stepper-motor operation 8.1.1 Multistack variable-reluctance motors 8.1.2 Single-stack variable-reluctance motors 8.1.3 Hybrid stepper motors 8.1.4 Linear stepper motor 8.1.5 Comparison of motor types 8.2 Static-position accuracy 8.3 Torque-speed characteristics 8.4 Control of stepper motors 8.4.1 Open-loop control 8.4.2 Translators and drive circuits 8.5 Summary

9 Related motors and actuators 9.1 Voice Coils 9.2 Limited-angle torque motors 9.3 Piezoelectric motors 9.4 Switched Reluctance motors 9.5 Shape-memory alloy 9.6 Summary

10 Controllers for automation 10.1 Servo control 10.1.1 Digital controllers 10.1.2 Advanced control systems 10.1.3 Digital signal processors 10.2 Motion controllers 10.3 Programmable logic controllers 10.3.1 Combinational-logic programming 10.3.2 Sequential-logic programming 10.4 Networks 10.4.1 Network architecture 10.4.2 Industrial networking 10.4.3 SCADA 10.5 Summary

Units and Conversion Factors Bibliography Index


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About the Author

Richard Crowder

Affiliations and Expertise

IAM Research Group, University of Southampton, UK


“This book presents a survey of mechanical components and system-level motor and motion-control components from an industrial control perspective. For an electronics engineer, the book has value in its coverage of the various mechanical components used in motion systems.” — Dennis Feucht, Innovatia