Optimum Stator Design for Vibration Reduction in Brushless DC Motor

Ngu, Yu Zuan (2022) Optimum Stator Design for Vibration Reduction in Brushless DC Motor. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Brushless DC motors are commonly used in many home appliances that are necessary in human’s daily life due to their high efficiency, high speed, low weight, low cost compared to other motors. However, their vibration level increase with the operating speed. The source of vibration in the brushless DC motor are identified from previous research papers. The method to reduce the vibration level in the motor that done by the other researchers are also discussed. A three phase brushless DC motor with 10 poles and 12 slots is used to perform the structural optimization of the stator. The parameters of stator that will be optimized include the diameter of hole on stator, the distance between the hole and coordinate system origin, the angle of hole from horizontal and stator yoke thickness. The optimization is based on manipulating the values of the stator parameters to shift the natural frequencies at different modes to the higher values. The 3D model of stator is developed using SolidWorks software in associated with the modal analysis by the Finite Element Method (FEM) in ANSYS workbench to obtain the natural frequencies of the stators. Besides, the vibration generated by the baseline model and optimized model at operating speed of 4000 rpm are also evaluated. As a result of optimizing stator structure, the overall amplitude of vibration in the optimized model is decreased about 71.7% in comparison with the baseline model.