Dual rotor single- stator axial air gap PMSM motor/generator drive for HEVs: A review of comprehensive modeling and performance characterization

In an effort to simplify the planetary-geared e-CVT for the parallel HEV or the series HEV we hereby propose-in a synthesis of these authors quite a few previous recent IEEExplore papers on the subject- to replace the basically two electric machines and their two power converters by a single, axial-air-gap, electric machine central stator, fed from a single PWM converter with dual frequency voltage output and two independent PM rotors capable to deliver independently torque by adequate vector control. The paper presents preliminary design with Matlab, optimal design via Hooke Jeeves method, sample quasi-2D and 3-D FEM results and dual vector control of a synchronous machine with axial air-gap single stator dual-rotor with permanent surface magnets and different pole pair's number, destined for hybrid electric vehicles (HEV) applications. For machine's designing the equivalent 3D magnetic circuits method, that takes into account the saturation and the magnetic field fringing, was used. A control model is developed for a single inverter that produces three phase output voltages with two frequency components. The modeling and performance characterization, and dual vector control show promising results, but experiments, which are now in preparation, are needed to prove the practicality of the proposed system.