Efficient heat dissipation is required in electric motors to prolong the durability of materials, especially in heavy duty vehicles where thermal generation is particularly intense.
In this work, several General Purpose Models (GPM), made with different combinations of insulating materials, have been analyzed by means of a combined experimental-numerical methodology, to analyse the effect of current intensity, convective boundary condition, and equivalent thermal resistance of the electrical insulation. First, they have gone through thermal measurements in order to compare their thermal conductivity, in their initial status and after thermal aging treatment. On the other side, a 2D thermal model has been developed in COMSOL to evaluate the equivalent thermal conductivity of each insulation layer combination. The methodology presented in this work compares different insulators from the point of view of heat dissipation efficiency, defining an equivalent thermal conductivity, both before and after a thermal aging treatment.