ABSTRACT

Reducing the cogging torque in the axial flux permanent magnet (AFPM) generators is an important study area. Especially, AFPM generators with open slotted and rectangular-shaped poles have high cogging torque and high total harmonic distortion (THD). Generators used in wind turbines require minimal mechanical vibration and a smooth sinusoidal wave. In this study, a new hybrid method is proposed to reduce the cogging torque and increase electrical performance. The proposed method involves combining two techniques to reduce cogging torque, including magnet placement angle and magnet grouping technique. In the proposed hybrid method, the electrical performance of the AFPM generator has improved for the minimum cogging torque. This proposed new method is cost-effective and easy to apply. 3D finite element method (FEM) and experimental verifications were performed for the accuracy of the proposed method. When the results are examined, cogging torque was improved by at least 80% with the new hybrid method. However, the electrical performance has been improved for 10% power loss, and the total harmonic distortion (THD) has been reduced to less than 3%.

摘要

降低轴向磁通永磁 (AFPM) 发电机的齿槽转矩是一个重要的研究领域。特别是具有开槽和矩形磁极的 AFPM 发电机具有高齿槽转矩和高总谐波失真 (THD)。风力涡轮机中使用的发电机需要最小的机械振动和平滑的正弦波。在这项研究中，提出了一种新的混合方法来降低齿槽转矩并提高电气性能。所提出的方法涉及结合两种技术来降低齿槽转矩，包括磁体放置角度和磁体分组技术。在所提出的混合方法中，AFPM 发电机的电气性能已针对最小齿槽转矩有所改善。这种提出的新方法具有成本效益且易于应用。对所提出方法的准确性进行了 3D 有限元法 (FEM) 和实验验证。当检查结果时，使用新的混合方法将齿槽转矩提高了至少 80%。然而，电气性能已提高 10% 的功率损耗，总谐波失真 (THD) 已降至 3% 以下。