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6 Reasons Your Motor is Overheating

January 7, 2016

motor overheating, fractional hp motors, hp manufacturer, gear motor

Selecting the right motor can be a challenging task, and finding a motor that matches your speed, torque and power requirements is not enough. There are many factors that need to be taken into consideration when choosing a motor that matches your application requirements. This list will provide you a few checks you can do to prevent your motor from overheating, saving you time and money on replacement motors. If you have are currently having issues with your motor overheating, we hope this checklist can help you determine the cause.

There are many factors that cause motor issues, but here are six reasons your motor may be overheating:

1.  Motor is too small for the application

It is important to make sure the motor you are using has been properly sized for the application, environment and duty cycle it will be performing in. A motor that is too small will not be able to dissipate heat quickly enough, and the motor will overheat.

2.  High ambient temperatures

If a motor is running in a much warmer environment than it was designed for, it can overheat because the ambient temperatures will make it more difficult for the motor to cool down properly. Check the insulation class of your motor (found on the motor’s nameplate).

3.  Running an intermittent duty motor continuously

It is important to run motors that are rated for intermittent duty applications at or below their duty cycle. In order for the motor to run at its rated performance specs, it needs to have time to cool-down completely between cycles. If the motor is run more frequently than it is supposed to, the motor will still be warm and will become increasingly hotter with each cycle, eventually overheating the motor.

4.  High or low voltage supply

Power supply may be insufficient due to amp draw. In order to overcome load or inertia at a stand-still, the motor’s running current will be much too high under load. Incorrect voltage supply will make the motor work harder and could cause it to overheat.

5.  High altitude

Motors cool less efficiently at higher elevations due to the thinner air. If you are at a higher elevation—1000 meters (3300 ft.) above sea level, talk to the manufacturer and make sure your motor is rated accordingly.

6.  Blocked ventilation holes

This may seem obvious, but the ventilation holes on your motor must be open to allow heat to escape. Check and make sure nothing is blocking them.

If you continue to have issues with your motor overheating, and have checked these common causes, call the manufacturer of your motor and see if they can help you troubleshoot the issue further. 

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