Mengesha Samuel, Rajput Shailendra, Lineykin Simon, Averbukh Moshe
Department of Electric and Electronic Engineering, Ariel University, Ariel 40700, Israel.
Department of Mechanic Engineering and Mechatronics, Ariel University, Ariel 40700, Israel.
Micromachines (Basel). 2021 Mar 19;12(3):323. doi: 10.3390/mi12030323.
An axial flux permanent magnet single-rotor generator has good potential in various applications that require high efficiency, prolonged service life, as well as low mass and dimensions. However, the effect of cogging torque diminishes generator efficiency and flexibility of functionality. The effect of cogging torque arises because of a small air gap between the stator teeth and the rotor. In this article, we suggest that shifting the opposite teeth of the stator to the optimal angle can reduce the effect of cogging torque. A special axial flux permanent magnet generator is developed to choose the optimal disposition of the permanent magnet and stator teeth in the frame. The impact of the optimal angle on the cogging torque, output power, and generator efficiency is investigated. This analytical study with experimental testing proves that the optimal angle between opposite teeth can significantly decrease cogging torque and improve output power and efficiency. The results show that cogging torque decreases significantly (4-5 times) at an optimal angle of 7.5° as compared with that of other angles, although magnetic flux and output power decline slightly but efficiency increases.
轴向磁通永磁单转子发电机在各种需要高效率、长使用寿命以及低质量和小尺寸的应用中具有良好的潜力。然而，齿槽转矩的影响会降低发电机效率和功能灵活性。齿槽转矩的产生是由于定子齿与转子之间的气隙较小。在本文中，我们提出将定子相对的齿移动到最佳角度可以降低齿槽转矩的影响。开发了一种特殊的轴向磁通永磁发电机，以选择永磁体和定子齿在框架中的最佳布置。研究了最佳角度对齿槽转矩、输出功率和发电机效率的影响。这项结合实验测试的分析研究证明，相对齿之间的最佳角度可以显著降低齿槽转矩，并提高输出功率和效率。结果表明，与其他角度相比，在7.5°的最佳角度下，齿槽转矩显著降低（4 - 5倍），尽管磁通量和输出功率略有下降，但效率有所提高。
