Novel Modeling Approach for Voltage Distribution within Automotive Electrical Machines

Due to electrification of vehicle drive trains brought about by electromobility increasing demands on reliability and longevity are confronted with increasing loads. Detailed modeling of the voltage distribution along stator windings is therefore becoming increasingly important in the design process in order to identify increases of voltage peaks and to design a robust insulation system. Since a great deal of effort is usually required to create a model that represents a reference machine, this paper presents an advanced concept that is generally valid for all types of stator winding topologies. In this concept an increase in efficiency is achieved by implementing the inductive and capacitive couplings matrix-wise. The matrices are calculated by means of an FEM simulation. Furthermore, the model can be calculated automatically and the used equivalent circuit can be changed or extended if necessary. Finally, simulation results of a reference machine are shown and the voltage distribution is discussed.