The project objective is to evaluate the reliability of motor winding technologies able to work at high temperatures. To achieve this goal within the time define in the Clean Sky call sheet, it is necessary to rely on existing technologies, which offer opportunities for rapid implementations on conventional machines, while opening new opportunities towards higher temperatures with innovative technologies.Three sets of technologies will be studied:- The technologies based on enamelled wires associated to polymer impregnation varnishes.- Technologies based on wires wrapped with glass fibber associated to impregnations made with epoxy resins.- The insulation technologies based on ceramics, which offer potential prospects for very high temperatures.The three sets of technologies will be tested for increasing temperatures on representative test vehicles (twisted pairs, transformer coils and motorettes) involving measurement systems able to get the main parameters of the insulation system (DC and AC leakage currents, partial discharge inception voltage, breakdown voltage, …). The analysis of changes in recorded parameters during the test campaigns will estimate the maximum permissible temperature in the heart of the winding for each technology. These data, combined with constraints of implementation of each technology will define recommendations for the design of electrical machines able to operate at high temperatures for each selected technology.The part relating to the use of ceramic insulations opens the way to a major technological leap. With such materials, the maximum operating temperature of electrical machines will no longer be imposed by the winding insulation system but by other parts (magnetic or mechanical), consequently new design methods will have to be developed. It is therefore important to put this new approach against the best we might obtain from other technologies by proposing solutions applicable in the short term.