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A 6/8 flux-switching machine with permanent magnets and a large air-gap (δ = 2.5mm) is optimized using finite element method. Maximum output torque and minimum torque ripple is achieved by means of alteration the C-shaped stator core dimensions and the rotor pole shape. Simulation results show, that the characteristics of the flux-switching machine are very suitable for applications where large air-gaps, high-speed operation and high rotor temperatures are requirements.