The present study determined by simulation, the energy efficiency of the internal configuration of the electric traction systems: simple traction (case 1) and in-wheel system (case 2), using a permanent magnet synchronous motor (PMSM) with a field oriented control (FOC). The study proposes an analysis in the VSI (Voltage Source Inverter) topology where the design of each configuration is explained and an energy efficiency analysis is presented taking into account the power losses in each configuration through simulation in PSIM (Powersim). Finally, the results are tested in a traction system model of the ADVISOR (Advance Vehicle Simulator) in the UDDS driving cycle where the energy efficiency of each configuration is determined.