Abstract
The hybrid axial field flux-switching permanent-magnet machine (HAFFSPMM) is a novel hybrid excited machine with short axial length and high torque density, which is suitable for electrical vehicle drive. However, the HAFFSPMM exhibits a higher cogging torque than traditional permanent-magnet machines due to the doubly salient structure and the high flux density. To reduce the cogging torque, three cogging torque reduction methods by tangential displacement of stators, asymmetric rotor pole shape, and segment-twisted rotor are investigated in this paper. The influences of the asymmetric angle of the three methods on the cogging torque and the output torque are analytically investigated and numerically verified by a three-dimensional finite-element method. The results show that the cogging torque can be greatly reduced, whereas the output torque decreases slightly even increases. In no terms of output torque, the cogging torque with segment-twisted rotor is less than the other two methods; in terms of output torque, the cogging torque reduction with an asymmetric rotor pole shape is better than the others.
Published Version
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