Testing of insulation for moisture resistance in a motor under operational stress

Continuous advances in rotating equipment design are placing greater demands on electrical insulations. The conditions under which magnet wire operates have been changing. In some cases, this has resulted from the removal of phase insulation, reduction in magnet wire build or the use of high temperature film insulated magnet wire with low temperature ground insulation. Operating temperatures, overload temperatures, voltage stresses and numerous types of atmospheres have increased over those encountered several years ago.