Relationship Between High-Temperature Operation and the Performance Guarantees of Induction Motors

A digital computer design program has been used to evaluate the effects of temperature rise on induction motor performance. The limiting performance guarantees are identified for 40 C (degrees centigrade) rise and 60 C rise machines. Class F and Class H temperature rises appear to require changes in machine geometry if these insulations are to be most effectively used in general-purpose induction motors.