Investigation of ceramic-coated profile conductors regarding insulation strength with the aim of better thermal connection to the laminated core of electrical machines

Abstract

This work addresses an alternative approach to electrical insulation of the winding by using ceramic materials such as aluminum oxide, which in addition to good insulation strength also have relatively high thermal conductivity. This can be applied to copper by thermal spray processes, which also allow the use of profiled conductors. In the present work, the determined values for insulation strength and insulation resistance are presented depending on different layer thicknesses and manufacturing parameters, as well as the influence of posttreatments. For this purpose, a special measurement setup is used which records the corresponding data with a large number of contact points and thus takes into account weak points caused by manufacturing variations.