Oemax User Guide

Listing Results Oemax User Guide

Frequently Asked Questions

• What are the torque requirements for a servo motor?

  For servo motors, the required torque must be below the motor's peak torque, and the RMS torque must be below the motor's rated torque. Since peak torque requires a high level of motor current, it cannot be sustained continuously without overheating the motor.

• How do I increase the inertia ratio of a servo motor?

  For auto-tuned servo motors, the inertia ratio increases to 50:1. For manual-tuned servo motors, it can increase to 100:1. After you make a tentative motor selection based on load inertia, find the motor rotor inertia in the specifications, then plug the value for J0 in order to complete the acceleration torque calculation.

• What is the total required torque?

  The total required torque is the sum of the load torque and acceleration torque as shown below (with a safety factor to cover for what we don't know). Mathematically, acceleration torque is made up of load inertia and acceleration rate as shown below.

• Can peak torque be sustained continuously without overheating the motor?

  Since peak torque requires a high level of motor current, it cannot be sustained continuously without overheating the motor. Let's now look at the equation for RMS torque and visualize the variables in a motion profile pattern.