Design and control of a single stator dual PM rotors axial synchronous machine for hybrid electric vehicles

In this paper is presenting the preliminary designing and control of a synchronous machine with axial airgap single stator dual-rotor with permanent surface magnets and different pole pairs number, destined for hybrid electric vehicles (HEV) applications. For machine´s designing was used the equivalent magnetic circuits method that takes into account the saturation and dispersion of the magnetic field. The control model is developed for a single inverter that produces three phase output voltage with two frequencies components; the torque current for each rotor is controlled through the stator current that passes the two serial windings. The machine, coupled with the thermal engine (ICE), can operate as starter for short time at start-up and as generator, when the rotational speed is established by the thermal engine´s regulator. The other machine can operate as motor in wide speed range (both inferior and superior to the generator´s), but also in generator regime with power recovery at braking.