微型无刷直流电机气隙优化研究

Study of Optimization of Air Gap for Small BLDC Motor

根据无刷直流电机的FOC控制理论,可知电机相反电动势对转矩波动的影响机理。通过研究无刷直流电机气隙长度对相反电动势波形及齿槽力矩的影响,使用Ansys Maxwell模拟软件对电机相反电动势,齿槽力矩及转矩波动等进行模拟分析,通过对相反电动势波形的FFT分解,对相反电动势谐波进行优化,并结合样机的对比测试结果,提出微型、高转速电机的气隙优化的方案。

In accordance with the control theory of FOC for 3-phases BLDC motor, the mechanism that how the motor phased-back EMF is impacting the motor torque fluctuation is known. This paper is providing a solution of optimizing the air gap of small and high speed motor by making a study on the impact of the air gap on the phased-back EMF and cogging of BLDC motor. The study was made by analyzing the motor phased-back EMF, cogging and torque fluctuation in Ansys Maxwell, optimizing the harmonic of phased-back EMF thru. the FFT analysis of the wave of phased-back EMF and combining the test results of actual samples.