Course 14:

MOTION CONTROL LOAD ANALYSIS

HOURS: 3.5

SCOPE: This course is a simplified effort to explain how loading of an actuator can be calculated as it confronts the motion control engineer.  It explains how all loads can and must be reduced to each of four different position, respectively, and how the fourth component can be some constant (independent) value.  The various load components are summarized using a press circuit as an example, and uses the motion control command profile to create load force and load power profiles.  Linear transformations devices such as gears, belts and pulleys, lead screws and conveyors are presented.  The course closes with an evaluation of non-linear transformation that takes place with many linear actuator systems that have triangulated loads, to show how the effective load changes with the actuator position.

OUTLINE:

• Physics of Mechanical Loads
• Five Design Time Decisions
• Newton's Laws
• One Dimensional Motion
• Four Components of Force
• Combining Forces on a Free Body
• Force Waveshapes in Motion Control
• Linearizing the Viscous Component
• Rotational vs. Translational Motion Systems
• Mechanical Transformation Devices
• Reflecting Loads Through the Transformer
• Other Transforming Devices
• Gears
• Conveyors-Elevators
• Some Dynamic Considerations
• Inertia at the Shaft
• Belts and Pulleys
• Non-Linear Load Transformation
• Equivalent Mass
• Mass Polar Moment of Inertia
• Parallel Axis Theorem
• Spring-Inertia Resonance Method of Determining Inertia Empirically
• Pendulous Resonance Method of Determining Inertia Empirically
• In Position Holding Force
• Load Resonance

Page Revised: July 14, 2003