直流无刷电机换向转矩脉动抑制研究

Reduction of Commutation Torque Ripple in Brushless DC Motors

为了解决直流无刷电机换向过程中转矩脉动较大的问题,提出了一种优化的脉冲宽度调制方法。为了分析直流无刷电机运行时脉冲宽度调制方法对电机换相转矩的影响,在理论上,从直流无刷电机方程入手,推导了直流无刷电机换相时的电磁转矩大小,分析了产生换相转矩的原因。针对使用传统脉冲宽度调制方法时电机转矩脉动较大的缺点,提出了一种新的脉冲宽度调制方法PWM-ON脉冲宽度调制。并从理论上证明了在直流无刷电机控制中,所提出的PWM-ON脉冲宽度调制方法产生的转矩脉动相比较小。在试验中使用了基于TMS320LF28016芯片的具有高可靠性与高灵敏性的DSP控制系统,通过实验证明,所提出的脉冲宽度调制方法有效地抑制了直流无刷电机换相时的转矩脉动。

To reduce the influences of the commutation torque ripples in Brushless DC（BLDC）,an optimal PWM method is proposed to analyze the PWM influences on the commutation torque ripples.Based on the principle and the BLDC motor equations,the mathematical derivation of the commutation torque ripples is given.To the main problem of torque ripples in brushless DC motor,a new PWM method（PWM-on）is proposed and proved to be efficient in reducing the torque ripple in theory.Based on the efficient TMS320LF28016 DSP control system,the experiment results show that the proposed method is efficient in reducing the torque ripple.