Correlation of thermal analyses with high temperature properties of magnet wire insulation and its relation to system selection

The experimental determination of the thermal life expectancy and performance of a magnet wire enamel is a long and time-consuming process.¹ Techniques for decreasing the evaluation time of 5,000 hours or more by a factor of about one hundred would be most welcome to those engaged in the synthesis and development of new enamels. Several attempts have been made to devise methods for achieving these ends,^2–7 with varying degrees of success. These methods, as is the method described herein, were proposed as predictors of the ASTM D 2307 results and not in any sense as replacements for that test.