How do you find the bearing temperature of a motor?

How do you measure bearing temperature?

Bearing operating temperature is determined by the equilibrium or balance between the amount of heat generated by the bearing and the amount of heat conducted away from the bearing.

What is the normal operating temperature of a bearing?

The normal operating temperature range is –65 degrees F to 300 degrees F (-55 to 149 degrees C) with suitable lubrication. Using a ball screw out side this range may make the screw brittle, warped or annealed.

Where do you measure the temperature of a motor?

Temperature rating also can be found on the motor’s original nameplate. Once the temperature rating is known, the temperature rise can be measured directly using sensors or an infrared temperature detector, or indirectly using the resistance method.

What is a high temperature for a bearing?

A simple rule for troubleshooting bearing temperatures: No more than 180 degrees Fahrenheit (82 degrees Celsius) on the housing. The bearing outer ring can be up to 20°F (11°C) hotter than the housing.

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What is C3 bearing?

Internal clearance being C3 means that the bearing has room for expansion if needed between the races of the bearing, whilst holding the outer ring and moving the inner ring in a radial movement you will detect a little amount of play between the two rings.

What are C3 bearings used for?

C3 is designed for hot running environments; engines etc. where the bearing temp could reach 100deg or more. C4 more extreme temperature applications and higher speed environments. C5 the highest clearance bearing available, are extremely loose to start and can knock until at operating speeds and temperature.

What causes bearings to overheat?


Overheating is generally the result of excessive operating temperatures and improper lubrication. High temperatures can cause grease to bleed (purge the oil), which reduces the lubricant’s efficiency.

What happens when bearing overheat?

High temperatures can cause grease to bleed (purge the oil) which reduces the efficiency of the lubricant. In elevated temperature conditions, oxidation causes loss of lubricating oils from the grease leaving a dry crusty soap that can seize the bearing.

How do you check for bearing problems?

You can usually identify this problem by looking at the bearing and seeing discoloration on the ball and raceway. It can also appear as an overloading failure because the heat causes the bearing ring to expand, increasing the resultant load to the bearing.

What is the normal operating temperature of a motor?

The surface temperature of a continuously (and correctly) operating general purpose industrial electric motor will easily be 80 C (176 F) and perhaps as high as 100 C (212 F). You can’t keep your hand on a surface that hot long enough to discern differences, and if you try, you could get a nasty burn.

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How do you check if a motor is too hot to touch?

To verify that overheating is caused by electrical overload and not a tight belt, you should measure amp draw using an ammeter. If the draw is 110% or more of what your motor is rated for (you can find this rating on the motor nameplate) the motor is overloaded.

Why does the temperature of a motor winding rise?

Temperature rise is the change within a motor when operating at full load. For example; if a motor in a 78°F room operates continuously at full load, the winding temperature will rise. The difference between its starting temperature and its final elevated temperature is the motor’s temperature rise.

What is a bearing in a motor?

The purpose of a bearing in an electric motor is to support and locate the rotor, to keep the air gap small and consistent and transfer the loads from the shaft to the motor. The bearings should be able to operate at low and high speeds whilst minimizing frictional loses.

How does rising temperature affect bearing fit?

Potential High Temperature Issues

Lubricant viscosity becomes too low, leading to reduced fatigue life. Raceway hardness is reduced, leading to reduced fatigue life. Seals dry & crack, leading to loss of lubricant, entrance of contamination. Cage/retainer weakens, leading to catastrophic failure.