Technical Resources

Quick Reference Guides

When making initial design decisions about motor and gearbox/speed reducer types, use these graphs and charts to narrow in on the best types based on your application characteristics.

Motor Types: Speed vs. Torque Comparison

The graph below maps the motor speed-torque curves of all four standard Groschopp motor types, using the same scale to clearly illustrate the differences between each motor. Notice the dramatically high no-load speed of a Universal motor and the significantly higher starting torques of Permanent Magnet and Brushless DC motors.

Motor Speed-Torque Curve

Motors: Quick Reference Guide

This quick reference chart for motors is something we developed that gives our customers, a “starting point” when selecting a motor. When you are selecting a motor for an application, you first need to determine which of the parameters are the most important for that particular application, and then make your motor selection accordingly. The Quick Reference Chart is basically a tool for differentiating the different motor types in terms of speed, horse power rating, efficiency, life, ratings, noise ratings, and starting torque.

motor speed-torque curve

Gearbox: Quick Reference Guide

This chart can be used as a tool in selecting the right gearbox for your application. The parameters listed in the far left column are the most typical and will once again give you a good “starting point” in figuring out what type of gearbox best fits your application.

But these parameters are not the only considerations you’ll need when selecting a gearbox. Other parameters like overhung load, envelope size, cost and mounting options are some examples of specifications that will also need to be evaluated with each application.

 motors speed-torque curve