Voltage feedback flux-weakening control has the advantages of simplicity and robustness against parameter variation. However, due to less voltage control margin in the flux-weakening region, the increased feedback voltage ripple could deteriorate the system performance in the flux-weakening region and may even cause oscillation. In this article, based on a nonsalient permanent magnet synchronous machine, the steady-state feedback voltage ripple in the flux-weakening region are analyzed first. It shows that the feedback voltage ripple caused by the current command ripple could dominate in some flux-weakening regions. Consequently, the speed bandwidth based on the conventional speed proportional-integral (PI) controller in the flux-weakening region can be hardly increased, which leads to poor dynamic performance. In order to obtain both fast speed dynamics and less steady-state ripple, especially in the flux-weakening region, an adaptive fuzzy logic (FLC) speed controller is designed and compared with the conventional speed PI controller. With the adaptive FLC, the dc-link voltage utilization can be increased and better flux-weakening capability can be obtained. Finally, the improved performances are verified by the experimental results.

中文翻译：

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永磁同步电机模糊逻辑速度控制及弱磁运行区反馈电压纹波减小


电压反馈弱磁控制具有简单、对参数变化鲁棒性等优点。然而，由于弱磁区的电压控制余量较小，增加的反馈电压纹波可能会降低弱磁区的系统性能，甚至可能引起振荡。本文基于隐凸永磁同步电机，首先分析了弱磁区的稳态反馈电压纹波。它表明，由电流命令纹波引起的反馈电压纹波可能在某些磁通弱化区域中占主导地位。因此，基于传统速度比例积分（PI）控制器的弱磁区域速度带宽很难增加，导致动态性能较差。为了获得快速的速度动态和较小的稳态纹波，特别是在弱磁区域，设计了自适应模糊逻辑（FLC）速度控制器，并与传统的速度 PI 控制器进行了比较。通过自适应FLC，可以提高直流母线电压利用率并获得更好的弱磁能力。最后通过实验结果验证了改进后的性能。