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摘要
The reduction of cogging torque is the basis of optimizing motor performance and improving system stability. To minimize the cogging torque of the five-phase permanent magnet motor, this paper proposed a multi-parameter compound optimization method based on the rotor structure. The energy method and Fourier expansion is utilized to deduce the cogging torque expression, in which relationship between the cogging torque, the pole-arc coefficient and rotor step skewing are revealed. Then, the prediction model of optimal pole-arc coefficient is offered, and the method to determine the optimal skewing angle corresponding to different permanent magnet segments is given. Furthermore, the response surface method is adopted to establish the mathematical models between the pole-arc coefficient, rotor step skewing and optimization objectives. The optimal rotor structure parameters are obtained by solving the mathematic models. Based on the structural parameters of the motor before and after optimization, finite-element models are established. Where after, some performance parameters of the initial and optimal motors are compared, which include no-load air-gap flux density, no-load back electromotive force (EFM) and cogging torque. Finally, a prototype is manufactured based on the optimal parameters, and the experimental research is carried out to verify the correctness of theoretical analysis and the effectiveness of optimization design. ?2023 Chin.Soc.for Elec.Eng.
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