Electric Drives and Electromechanical Systems

Applications and Control


  • Richard Crowder, IAM Research Group, University of Southampton, UK

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.
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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.


Book information

  • Published: January 2006
  • Imprint: NEWNES
  • ISBN: 978-0-7506-6740-1


“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

Table of Contents

1 Electromechanical Systems1.1 Principles of automation1.2 Machine tools1.2.1 Conventional machining processes1.2.2 Non-conventional machining1.2.3 Machining centers1.3 Robots1.3.1 Industrial robots1.3.2 Robotic hands1.3.3 Mobile robotics1.3.4 Legged robots1.4 Other applications1.4.1 Automotive applications1.4.2 Aerospace applications1.5 Motion-control systems1.6 Summary2 Analysing a drive system2.1 Rotary systems2.1.1 Fundamental relationships2.1.2 Torque considerations2.1.3 Gear ratios2.1.4 Acceleration without an external load2.1.5 Acceleration with an applied external load2.1.6 Accelerating loads with variable inertias2.2 Linear systems2.3 Friction2.4 Motion profiles2.5 Assessment of a motor-drive system2.5.1 Mechanical compatibility2.5.2 Electromagnetic compatibility2.5.3 Wiring considerations2.5.4 Supply considerations2.5.5 Protection from the environment2.5.6 Drive hazards and risk2.6 Summary3 Power transmission and sizing3.1 Gearboxes3.1.1 Planetary gearbox3.1.2 Harmonic gearbox3.1.3 Cycloid gearbox 3.2 Lead and ball screws3.3 Belt drives3.4 Bearings3.4.1 Conventional bearings3.4.2 Air bearings3.4.3 Magnetic bearings3.5 Couplings3.6 Shafts3.6.1 Static behavior of shafts3.6.2 Transient behavior of shafts3.7 Linear drives3.8 Review of motor-drive sizing3.8.1 Continuous duty3.8.2 Intermittent duty3.8.3 Inability to meet both the speed and the torque requirements3.8.4 Linear motor sizing3.9 Summary4 Velocity and position transducers4.1 The performance of measurement systems4.1.1 Random errors4.1.2 Systematic errors4.1.3 Digital-system errors4.1.4 Analogue-digital and digital-analogue conversion errors4.1.5 Dynamic performance4.2 Rotating velocity transducers4.2.1 Brushed d.c. tachogenerators4.2.2 Brushless d.c. tachogenerators4.2.3 Incremental systems4.2.4 Electromechanical pulse encoders4.3 Position transducers4.3.1 Brushed potentiometers4.3.2 Linear variable differential transformers - LVDT4.3.3 Resolvers4.3.4 Rotary and linear Inductosyn4.3.5 Optical position sensors4.4 Application of position and velocity transducers4.4.1 Mechanical installation4.4.2 Electrical interconnection4.4.3 Determination of datum position4.5 Summary5 Brushed direct-current motors5.1 Review of motor theory5.2 Direct-current motors5.2.1 Ironless-rotor motors5.2.2 Iron-rotor motors5.2.3 Torque motors5.2.4 Printed-circuit motors5.3 Drives for d.c. brushed motors5.3.1 Four-quadrant thyristor converters5.3.2 Linear amplifiers5.3.3 Pulse width modulated servo drives5.3.4 Analysis of the bipolar PWM amplifier5.3.5 PWM amplifiers5.4 Regeneration5.5 Summary6 Brushless motors and controllers6.1 The d.c. brushless motor6.1.1 Torque-speed characteristics6.1.2 Brushless d.c. motor controllers6.2 Sinewave-wound brushless motors6.2.1 Torque characteristics6.2.2 Voltage characteristics6.2.3 Torque-speed characteristics6.2.4 Control of sinewave-wound brushless motors6.3 Linear motors6.4 Summary7 Induction motors7.1 Induction motor characteristics7.2 Scalar control7.3 Vector control7.3.1 Vector control principles7.3.2 Implementation of vector control7.3.3 Vector Control using sensors7.3.4 Sensorless Vector Control7.4 Matrix Converter7.5 Summary8 Stepper motors8.1 Principles of stepper-motor operation8.1.1 Multistack variable-reluctance motors8.1.2 Single-stack variable-reluctance motors8.1.3 Hybrid stepper motors8.1.4 Linear stepper motor8.1.5 Comparison of motor types8.2 Static-position accuracy8.3 Torque-speed characteristics8.4 Control of stepper motors8.4.1 Open-loop control8.4.2 Translators and drive circuits8.5 Summary9 Related motors and actuators9.1 Voice Coils9.2 Limited-angle torque motors9.3 Piezoelectric motors9.4 Switched Reluctance motors9.5 Shape-memory alloy9.6 Summary10 Controllers for automation10.1 Servo control10.1.1 Digital controllers10.1.2 Advanced control systems10.1.3 Digital signal processors10.2 Motion controllers10.3 Programmable logic controllers10.3.1 Combinational-logic programming10.3.2 Sequential-logic programming10.4 Networks10.4.1 Network architecture10.4.2 Industrial networking10.4.3 SCADA10.5 SummaryUnits and Conversion FactorsBibliographyIndex