The single stator dual rotor PMSM for HEV: Two windings and 4 leg inverter control

This paper proposes a single stator dual rotor PMSM for HEV drive-system with two distinct stator windings in Δ connection, four leg inverter and two capacitors connected in series, with Field Oriented Control new solution. The four leg inverter that drives the two rotors should result in additional reliability and compactness through at the cost of addition kVA rating. The A and B phases of both machines are connected to dedicated legs whereas C phase of both machines is connected to the neutral point of the two-split capacitors. The standard PWM technique in three-phase voltage source inverters is not directly applicable because only two phases may be modulated. So, a dedicated PWM strategy that reduces the capacitor middle point voltage pulsations is introduced and “tested” through extensive digital results.