In this article, a novel structure is proposed for a wound rotor synchronous machine with a small ferrite magnet in each rotor pole. The key is to achieve a higher reluctance torque term and also acquire torque-angle approaching that would allow the field torque and reluctance torque to reach maximum values at the closed current phase angle for efficient production of the average total torque. The assisting ferrite magnet in the proposed model helps compensate the q-axis flux while keeping the d-axis flux unchanged as much as possible, for enhancing reluctance torque and power factor. Meanwhile, the assisting ferrite magnet makes an asymmetrical magnetic flux distribution to close the current phase angles between the maximum of the field torque and the reluctance torque. Moreover, the related parameters of the assisting ferrite magnet in the proposed structure were determined by optimal techniques using the Kriging method and genetic algorithm. In addition, the potential for demagnetization of the assisting magnet was analyzed and the results verified that this would not affect the motor output performance. Finally, prototypes are manufactured for the experiments to verify the principle analysis and finite element analysis results.

中文翻译：

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一种带磁阻转矩增强的永磁辅助绕线转子同步电机的分析与设计

在本文中，提出了一种新颖的绕线转子同步电机结构，在每个转子极中都有一个小铁氧体磁铁。关键是要实现更高的磁阻转矩项并获得转矩角逼近，这将允许励磁转矩和磁阻转矩在闭合电流相角处达到最大值，从而有效地产生平均总转矩。所提出模型中的辅助铁氧体磁铁有助于补偿 q 轴磁通，同时尽可能保持 d 轴磁通不变，以提高磁阻转矩和功率因数。同时，辅助铁氧体磁体形成不对称的磁通分布，以缩小励磁转矩最大值与磁阻转矩之间的电流相位角。而且，所提出结构中辅助铁氧体磁体的相关参数是通过使用克里金方法和遗传算法的优化技术确定的。此外，分析了辅助磁铁退磁的可能性，结果证实这不会影响电机输出性能。最后制作样机进行实验验证原理分析和有限元分析结果。