Analysis of the magnetomotive force in the multiphase machines within integrated battery chargers for the electric vehicles

In this paper we discuss magnetomotive force (MMF) in the multiphase machines during fast charging of batteries in electric vehicles (EV). Analytical considerations show that using an adequate topology of power converter and additional levels of freedom one can achieve a fast charging without creating any revolving magnetic field within the machine. They also show that this regime can be achieved by using only the elements of the traction system and without changing the configuration between charging and traction regimes. The simulation models have been developed for the relevant configurations of the stator asymmetrical winding in six-phase and nine- phase integrated electrical machines within the charging system of an EV. As the result, the time-space distribution of the magnetic field in charging mode is obtained. Based on the results, suggestions are given for the design of an integrated traction / charging system within electric vehicles.