How Do You Calculate Torque for Servo Motors in a Pick and Place System?

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SUMMARY

The discussion focuses on calculating torque for servo motors in a Pick and Place system, specifically for a setup involving two servo rotary axes. The system requires motors capable of handling a peak torque sufficient to accelerate a 50 kg component attached to a 100 mm plate, moving from 0 to 180 degrees within 1 second. Participants emphasize the importance of accounting for both translational and rotational masses to determine the necessary torque, recommending the "Smart Motion Cheat Sheet" as a valuable resource for these calculations.

PREREQUISITES
  • Understanding of basic dynamics principles, particularly torque and inertia calculations.
  • Familiarity with servo motor specifications and performance metrics.
  • Knowledge of rotational motion and its conversion to linear motion.
  • Experience with mechanical systems design, particularly in automation applications.
NEXT STEPS
  • Research the "Smart Motion Cheat Sheet" for detailed torque calculation methodologies.
  • Learn about servo motor specifications, focusing on peak torque ratings and acceleration profiles.
  • Explore the principles of rotational dynamics and their application in servo systems.
  • Investigate methods for calculating inertia in mechanical systems, particularly for pick and place applications.
USEFUL FOR

Engineers and designers working on automation projects, particularly those involved in robotics, pick and place systems, and servo motor selection and sizing.

kripaharan
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Hi all,
I am doing a project on Pick and Place system with 2 Servo based Axis control system. I am struggling in selecting the servo motor and torque calculation. My pick and place system consists of 2 Servo Rotary axis which indexes from 0 degree to 180 Degree with 1 Sec acceleration and deceleration and my component weights 50 kgs. Can anyone give me the formula for torque and inertia calculation. My concept is, a 100 mm plate with one end connected directly with servo motor shaft and other end with 50 Kgs component. How do i select servo motor for this kind of system.

Regards
kripaharan
 
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You don't provide any information on HOW the rotary motion of your servo motor is converted to linear motion. Doesn't really matter.

Your motors should be sized for peak torque. Account for all translational & rotational masses and determine the amount of torque required of the motor to accelerate those masses to the desired speed in the required amount of time. Sum everything, and that's peak torque. Your motor must provide at least that much.

This is basic 2nd year dynamics calculations. Websearch for a PDF document called "Smart Motion Cheat Sheet", it is summarized in there.
 

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