变角度导通法补偿换相转矩脉动

Attenuation of Commutation Torque Ripples by the Variable Commutation Angle Method

针对微型无人机电动力系统对低噪声、高平稳性的要求,对无刷直流电动机换相过程建立数学模型,分析了转矩脉动,提出一种变角度导通的实现方法,即根据电机转速选择合适的导通角度,以补偿无刷直流电动机由于换相引起的转矩脉动。仿真结果表明,转矩脉动量与导通角度的大小不成正比,成凹形关系。相比120°导通方式,采用变角度导通法使脉动幅值减小了35%。结果证明变角度导通法可以有效抑制无刷直流电动机换相转矩脉动,减小噪声,提高微型无人机的平稳性。

According to requirements of low noises,high stability for the electrical drives of micro-UAVs,a mathematic model of commutation process in BLDCM was derived to analysis torque ripples.This paper proposed a variable-commutation-angle method,in which conduction angle was varied with speed in order to compensate the commutation torque ripples.Simulation result shows that commutation torque ripples are not proportional to conduction angle,but a concave-relationship between them.Compared with traditional method,the torque ripples decrease 35 percent using the proposed method.The results verify the flexibility of the proposed method in reducing commutation torque ripples,decreasing noises and increasing stability of micro-UAVs.