This article proposes pulse width modulation (PWM) methods for low inductance brushless dc (BLDC) motor drives that minimize the commutation torque ripples. An uneven current of noncommutation phase generates the commutation torque ripples. In the low inductance BLDC motor drives, two types of time delays in PWM also induce critical torque ripples. In this article, the analyses of the time delays in PWM and their effects are introduced. Then, two PWM methods are proposed to eliminate the time delays in the commutation region and the conduction region, respectively. The commutation period is controlled to be synchronized to the switching period. In addition, the proposed methods synchronize the switching period to the commutation interrupt. As a result, the proposed methods effectively maintain the minimum commutation period as well as minimize the commutation torque ripples in the low inductance BLDC motor drives. The validity of the proposed methods is demonstrated by the simulation and experimental results in various driving conditions. The results show that the commutation period is remarkably shortened and the commutation torque ripples are reduced by 27.6% in comparison to the conventional method.

中文翻译：

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用于最小化低电感无刷直流电机驱动中的换向转矩纹波的脉宽调制方法

本文提出了用于低电感无刷直流 (BLDC) 电机驱动器的脉宽调制 (PWM) 方法，可最大限度地减少换向转矩纹波。非换相相的不均匀电流产生换相转矩脉动。在低电感 BLDC 电机驱动器中，PWM 中的两种时间延迟也会引起临界扭矩纹波。本文介绍了PWM中的延时及其影响的分析。然后，提出了两种 PWM 方法来分别消除换向区和导通区的时间延迟。换向周期被控制为与开关周期同步。此外，所提出的方法将开关周期与换向中断同步。因此，所提出的方法有效地保持了最小换向周期，并最大限度地减少了低电感 BLDC 电机驱动中的换向转矩波动。各种驾驶条件下的仿真和实验结果证明了所提出方法的有效性。结果表明，与传统方法相比，换向周期明显缩短，换向转矩脉动降低了27.6%。