Analysis for cogging Torque Reduction Method of Outer Rotor Hybrid Excitation Flux Switching Machine

Abstract Cogging torque, caused by the interaction of stator slots and rotor magnets, degrades motor performance by producing noise, vibration, and torque ripple even without current in the windings. This study investigates cogging torque reduction techniques in Outer Rotor Hybrid Excitation Flux Switching Machines (OR-HEFSMs) using JMAG Designer. Three approaches—chamfering, notching, and pole pairing—are modelled and compared. The results show that pole pairing reduced cogging torque by 18.77% while improving output torque by 10.46 Nm, making it the most effective method. These findings provide practical design insights for developing smoother, more reliable, and efficient OR-HEFSMs for industrial, renewable energy, and electric vehicle applications