![]() ![]() ![]() 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.Īmbient temperature is the temperature of the air (or other cooling medium) that surrounds the motor. Temperature rating also can be found on the motor’s original nameplate. The National Electrical Manufacturers Association (NEMA) defines this rating for three-phase induction motors in its standard Motors and Generators, MG 1-2003. The first step to prevent unexpected shutdowns and extend motor life is to determine the temperature rating of the motor. But it is easy to forget that exceeding the rated operating temperature by as little as 10 C (18 F) can shorten the life of a three-phase induction motor by half. It is no secret that heat kills electric motors. Regularly checking the operating temperature of each critical motor will pay dividends. ![]()
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