A Comprehensible Guide To
Servo Motor Sizing
by Wilfried Voss

Paperback Book $39.00
Download (PDF) $29.00

About this book
The Importance of servo motor sizing should not be underestimated. Proper motor sizing will not only result in significant cost savings by saving energy, reducing purchasing and operating costs, reducing downtime, etc.; it also helps the engineer to design better motion control systems. However, the knowledge of mechanical systems and their influence on motor speed, inertia and torque requirements seems to decline in a world where modern technology aspects, such as tuning and programming, seem to be the main focus. The motor sizing process involves a number of mathematical equations, which are most certainly documented, but not necessarily with the motor sizing process in mind. This book focuses primarily on servo motor sizing and it documents in detail the inertia and torque calculations of standard mechanical components and the motor selection process.

About the author
Wilfried Voss is the President of Copperhill Technologies Corporation, a company specializing in motor sizing software development for various motor manufacturers all over the world. In addition, Copperhill Technologies sells user licenses of its generic motor sizing program, VisualSizer-Professional^TM.

    2.1 Why Motor Sizing?
    2.2 Technical Aspects
    2.3 The Objective of Motor Sizing

3. The Motor Sizing and Selection Process

    3.1 Selection of mechanical components
    3.2 Definition of a load cycle
        3.2.1 Triangular motion profile
        3.2.2 Trapezoidal motion profile
        3.2.3 Motion profile processing
        3.2.4 Motion profile calculation
        3.2.5 Motion profile equations
        3.2.6 Jerk Limitation
            3.2.6.1 S-Curve Calculation
    3.3 Load calculation
        3.3.1 Load maximum speed
        3.3.2 Load inertia and maximum torque
        3.3.3 Load RMS torque
    3.4 Motor Selection
        3.4.1 Matching Motor Technologies to Applications
            3.4.1.1 Stepper Motors
            3.4.1.2 DC Brush Motors
            3.4.1.3 DC Brushless Motors
            3.4.1.4 AC Induction Motors
        3.4.2 Selection Criteria
            3.4.2.1 Inertia Matching
            3.4.2.2 Interpretation of Torque/Speed Curves
            3.4.2.3 Servo Motor Performance Curves
            3.4.2.4 Stepper Motor Performance Curves
            3.4.2.5 Servos vs. Steppers
    3.5 Special Design Considerations
        3.5.1 Gearing
        3.5.2 Holding Brake and Motor Torque Requirements
        3.5.3 Vertical Applications
        3.5.4 Thrust Forces
        3.5.5 Load Variations
        3.5.6 Multi-Dimensional (X-Y-Z) Applications
        3.5.7 Thermal Considerations
    3.6 Sample application - comprised

4. Load Inertia and Torque Calculation

    4.1 Basic Calculations
        4.1.1 Fundamental Equations
        4.1.2 Solid Cylinder
        4.1.3 Hollow Cylinder
        4.1.4 Rectangular Block
    4.2 Calculation of Mechanical Components
        4.2.1 Disk
        4.2.2 Chain Drive
        4.2.3 Coupling
        4.2.4 Gears
        4.2.5 Gearbox / Servo Reducer
        4.2.6 Belt-Pulley
        4.2.7 Conveyor
        4.2.8 Leadscrew
        4.2.9 Linear Actuator
        4.2.10 Nip Roll
        4.2.11 Rack Pinion
        4.2.12 Rotary Table
        4.2.13 Center Driven Winder
        4.2.14 Surface Driven Winder

5. Motor Sizing Programs

    5.1 Motor Sizing Programs for Windows
        5.1.1 Axis Design
        5.1.2 Velocity Profile
        5.1.3 Motor Selection
        5.1.4 Report Generator
        5.1.5 Performance Curves

Appendix A - References
Appendix B – Web Site References
Appendix C – Symbols & Definitions
Appendix D – Material Densities
Appendix E – Mechanism Efficiencies