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The purpose of this paper is to present an asymmetrical V-shape rotor configuration of an interior permanent magnet (IPM) machine for improving the torque characteristics, i.e., reducing cogging torque and torque ripple. Using this rotor configuration, the great reduction of the cogging torque and the torque ripple can be achieved. To acquire more desired torque characteristics, an optimization design is implemented using hybrid genetic algorithm-Taguchi (HGAT). Time-stepping finite-element analysis is adopted to calculate the torque characteristics for comparison and analyses. The best set of design parameters is found out; and the IPM model optimized using the HGAT shows even better torque characteristics. An IPM machine prototype having HGAT-design parameters was manufactured for test, and the effectiveness of the proposed rotor is verified by comparison between the simulation and the experiment results.
Ren et al. (Tue,) studied this question.