Results from continued interlaboratory simulated insertion (SI) round-robin testing

The authors present data from the continued evaluation of simulated insertion (SI) test fixtures manufactured and finished by the same shop. Also included are data demonstrating differences in SI force levels when evaluating the effect of different slot liner materials. On the basis of the test results, it is concluded that no significant difference in SI test results would be found when testing using the same wire sample and SI test fixtures of identical dimensions and surface finish. It is demonstrated that this test measures the combined effect that the characteristics of a magnet wire have on insertion forces. It is also found that most slot liner materials cause higher simulated insertion values than those measured with a polished steel surface. Furthermore, the specific simulated insertion force is directly related to the type of slot liner material