Reducing torque pulsation in interior permanent magnet machine with FSCW for hybrid electric vehicle

This paper analyzes and studies the methods of reducing torque pulsation in interior permanent magnet (IPM) machines with fractional-slot concentrated-winding (FSCW) for hybrid electric vehicles. Several methods are proposed to reduce the cogging torque and ripple torque for the IPM machine. Two finite element analysis (FEA) models of the IPM machine, including FSCW and integer-slot distributed windings, are studied in order to verify the proposed method. Finally, the performance of the machine with these two windings, including the flux-weakening capabilities, is compared. The comparison results show that the machine with FSCW has lower torque pulsation and wider speed range of constant power than the machine with integer-slot winding.