What is the generally allowable temperature rise in a fan motor?

With Class F insulation, the maximum allowable temperature rise ranges from 105 to 115 C for the motor’s winding insulation, depending on how the motor is configured.

What is temperature rise of a motor?

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. Hot spot allowance.

What is the maximum 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.

What happens if an electric motor gets too hot?

One of the most common performance issues in electric motors is overheating. Experts suggest that an 18°F (10°C) degree increase in motor winding temperature can directly affect the insulation of the component and reduce its lifespan by 50%.

What is hot and cold start of motor?

Hot start and cold start refer to the temperature of the motor when starting. Hot start is usually a restart after coasting to a stop. Cold start is an initial start, after not having run for a relatively long period of time.

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Is the most common cause of motor failure?

Low Resistance. The most common cause of motor failure, and arguably the most difficult to overcome, is low resistance. Low resistance is caused by the degradation of the insulation of the windings due to conditions such as overheating, corrosion, or physical damage.

Why does a 3 phase motor overheat?

Bearing failure, overload, insulation breakdown, environmental contamination, improper input power, can all be reasons for early failure. If the motor has gotten to a certain heat the insulation in the stator windings will be irreparably damaged.

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