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Understanding motor temperature rise limits

Publication date: 
November 2003
Author: 
Tom Bishop, P.E., EASA Senior Technical Support Specialist

How do we know if a motor is operating within its temperature rating? The simple answer, and a good one, is that the National Electrical Manufacturers Association (NEMA) has defined temperature rise for electric motors in Motors and Generators, NEMA standard MG 1-1998. In this article we will focus on temperature rise and temperature sensing of three-phase induction motors.