Simulation analysis for noload airgap fluxdensity waveform of wheelhub permanentmagnet brushless DC motor

CHE Liangsong, PAN Baisong, GE Daochuan, ZHENG Lijun, LIU Weijiang
(Key Laboratory of E&M, Ministry of Education & Zhejiang Province,
Zhejiang University of Technology, Hangzhou 310014, China)

Abstract: Aiming at the problems of improving high quantity of harmonic in noload airgap flux density in the motor, wheelhub permanentmagnet brushless DC motor adopt finite element method. The noload airgap fluxdensity waveform was optimized, which affected the performance of wheelhub permanentmagnet brushless DC motor. By this way, the airgap fluxdensity harmonics was reduced, the performance of wheelhub permanentmagnet brushless DC motor had also been improved. The width of rebate, the gap and the thickness of poles were changed in order to reduce the airgap fluxdensity harmonics. Through drawing the diagram of factor levels influent trend, how various factors affect on airgap flux density waveform has been analyzed. The diagram of factor levels influent trend was analyzed which was described according the last simulated results. The results indicate that the most optimized scheme can optimize the motor structure parameters and provide a basis for motor design.
Key words: orthogonal experiment method; numerical simulation; airgap flux density; total harmonics distortion(THD)