Development of an Environmental-Friendly Insulation System for the Next-Generation Sustainable Electric Drive Unit

Report, 2025

This report presents the results of the experiments performed with model insulation systems representing rotor and stator subsystems of an electrical machine. Different combinations of materials for wire insulation and slot liners were evaluated by measurements of inception and extinction voltages of partial discharges in the insulation. The tests were conducted by stressing the insulation with bi-polar square shaped test voltages. The insulation systems were thermally aged in air and in oil at temperatures 150C and 180C, respectively. The obtained results provide solid ground for further analysis and materials selection for future environmentally friendly and recyclable insulation systems of electrical machines for electromobility applications.