Performance Evaluation of an On-Board Integrated Battery Charger System Using a 12-Slot/10-Pole Surface-Mounted PM Propulsion Motor

The concept of Electric Vehicles (EVs) withonboard integrated battery chargers, which can be directly connected to the three-phase ac mains, has recently emerged as a cost effective and a practical alternative to charging stations. In such systems, the propulsion system power electronics are used to charge the battery, while, the stator winding of the propulsion motor is used to filter the charging current. This way, the need for separate bulky inductors typically used in battery charging converters is eliminated. Among the different configurations presented in the literature, those based on multiphase windings reduce the need for extra hardware components for winding reconfiguration to switch between propulsion and charging modes of operation. All systems provided in the literature are either based on induction or PM synchronous motors with distributed windings. In recent motor designs employed to EV, PM machines with Fractional Slot Concentrated Winding (FSCW) is much preferred. This paper investigates the effect of different operational modes of an on-board integrated battery charger on the torque ripple and the induced rotor eddy current loss caused by different MMF space harmonics associated with such FSCW type. The well-known 12-slot/10-pole PM machine is employed in this study and simulated using 2D finite element simulations.