Multi-objective Optimization Design of High-speed Wet Permanent Magnet Brushless DC Motor

doi:10.3901/JME.2025.20.339

Abstract

Abstract: In order to optimize the electromagnetic characteristics and viscous friction loss of wet permanent magnet brushless DC motor(WPMBLDC) at high speed, an 8-pole 12-slot WPMBLDC was taken as the research object, and the finite element method was used to study the electromagnetic performance and internal flow field characteristics of the motor. In order to reduce the peak value of no-load cogging torque, output torque ripple and viscous friction loss, and improve the average output torque, the no-load back electromotive force of the motor should not exceed 250 V. The evolutionary algorithm is used to analyze the sensitivity and influence of stator slot structure parameters, armature diameter, air gap width, pole arc coefficient and permanent magnet thickness on the electromagnetic characteristics and viscous friction loss of the wet motor, and the optimization and experimental verification are carried out. The results show that the air gap width, slot opening and pole arc coefficient are the significant factors affecting the electromagnetic characteristics of the wet motor. The groove opening and the outer diameter of the rotor are the significant factors affecting the viscous friction loss of the wet motor. After optimization, the peak value of cogging torque is reduced by 48.23%, the average torque is increased by 53.5%, the torque fluctuation is reduced by 16.11%, and the viscous friction loss is reduced by 14.8%. The optimization effect is more significant.

Key words: permanent magnet brushless DC motor, wet motor, electromagnetic characteristics, sensitivity analysis, multi-objective optimization, viscous friction loss

CLC Number:

V228

GAO Tianxiong, YANG Liu, YAO Xudong, XIAO Shouwen, AI Chao, KONG Xiangdong. Multi-objective Optimization Design of High-speed Wet Permanent Magnet Brushless DC Motor[J]. Journal of Mechanical Engineering, 2025, 61(20): 339-348.

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