This article proposes a variable-leakage-flux flux-intensifying permanent magnet machine (VLF-FIPMM). Through the addition of magnetic bridge and the innovative design of magnetic barrier, the machine owns the feature of Ld<Lq and variable-leakage-flux characteristic, which not only widens the speed, but also reduces the irreversible demagnetization risk and core loss. Firstly, the design idea and operating theory of the VLF-FIPMM are analyzed. At the same time, a multi-objective genetic algorithm based on sensitivity analysis is introduced to obtain the optimal torque, torque ripple and reverse saliency ratio. Then the overall performance of the VLF-FIPMM is compared with the conventional IPM machine. Finally, the stress and deformation of the VLF-FIPMM are simulated at high speed. The above simulation results also validate the reliability of the design method and optimization.
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