High Power Density EV Integrated Fast Battery Chargers Based on the General Torque Cancelation Law for Three-phase Motors

This paper proposes, the general torque cancelation law applied in 3p permanent magnet synchronous motors (PMSMs) and induction motors (IMs) is derived to design high power density integrated fast battery chargers. Two novel integrated systems with fast-charging and vehicle-to-grid (V2G) capabilities are proposed based on this law. The main advantages of the proposed systems are Two filter inductors are constituted by the stator windings while charging, and only one external inductor and several contactors are supplemented to the motor-drive circuit. Therefore, the proposed integrated systems possess high power density The 3p open-winding (OW) motor is employed, with no need to modify the propulsion system or redesign the interior structure of the motor Employing an individual controller for each phase of the inner current loop control, the proposed systems realize unity power factors and low current harmonics in the fast-charging and V2G mode.

Keywords: Electric vehicles (EVs), fast charging, integrated battery charger, 3p PMSM/IM, torque cancelation.