WHITEPAPER – Gearmotors: Achieving the Perfect Motor & Gearbox Match

June 11, 2012

motors, gearmotors, Groschopp, fractional, HP, horsepower

For electrical and mechanical design engineers in the process of developing applications, choosing a gearmotor can be a tricky and
arduous process. Can motors and gearboxes be purchased separately and then matched for an application? Is it better to specify a pre-engineered gearmotor? What are the differences?

Focusing on how to choose the right motor/gearbox combination for your OEM
application; this whitepaper will explain cost optimization, performance and other critical application considerations. Outlining the basic motor and gearmotor types and the advantages of each choice will help a designer more easily calculate and choose the best gearmotor for the required application. Even if a new gearmotor is not needed immediately, many of the ideas presented will help audit a current gearmotor’s performance within an application.

Learn how to:

  • Interpret ratings and characteristics of various gearbox types as a “total picture”
  • Select the right motor based on gearbox ratings
  • Identify key application and performance characteristics (beyond speed, torque and life) such as yield strength, operating speed, mounting position, and loading
  • Avoid common mistakes such as selecting a motor that is too large, problems with overheating, and miscalculating yield torque
  • Why thermal and mechanical factors limit gearbox efficiency and performance
  • Understand the effect of torque density on the heat and life of a motor
  • Tips for selecting the correct gearbox ratio


Groschopp offers two invaluable timesavers: the “Application Considerations Checklist,”  and the downloadable STP Calculator, which performs a number of useful calculations, such as current required, speed, torque, and power calculations.


How to use the Motor Search Tool

Narrow your search by selecting motor type, gearbox, voltage, and phase options for your desired motor.

Select a dominant variable: choose one of the three parameters to narrow your search. The selected variable determines which slider bar you will be able to manually move.

Use the slider corresponding to your dominant variable to further narrow your motor selection. The other sliders will automatically move to show available ranges based on the range of your selected variable.

Results will upload as your search criteria changes. If you have any questions regarding your results or how to use the search tool, you can chat with us using the green tab on the left-hand side of your screen.

Note: Groschopp Universal motors are custom built to fit your application so no additional options are available to narrow the search. Selecting the Universal motor type will prompt a message taking you to the Universal product page.

Not sure what you need?

One of our team members would be happy to help. Contact us at 800-829-4135 or by email at sales@groschopp.com. You can also chat with us using the green tab on the left side of your screen.

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Universal Motors

Groschopp Universal motors are custom built to fit your application so no additional options are available to narrow the search. Standard frame sizes and motor features can be found on the Universal page.

go to Universal page