Electric motors represent one of the most efficient and performant devices to convert electrochemical energy into mechanical energy. The permanent magnet synchronous machines (PMSMs) are the most commonly employed solutions for electric propulsion in the automotive field, thanks to their high torque capability and high efficiency, compared to other solutions as the induction machines. Nevertheless, reducing the losses in electric motors is one of the major targets in the automotive industry and to model them, the major tool employed is finite element analysis (FEA). The scope of this research activity is to accurately model and predict the electric motor losses and efficiency, exploiting the case study of the internal permanent magnet employed in the Fiat 500 battery electric vehicle (BEV).