The resistance of the electric machine’s windings is an important parameter when analyzing the machine’s performance, as conduction losses in the winding are often the largest loss component. However, this resistance changes with frequency due to the skin and proximity effects, making it challenging to accurately estimate these losses. In this article, a computationally efficient, general method of calculating the ac resistance of an electric machine winding with rectangular conductors is presented. The method uses a 1-D magnetoquasi-static model of the stator slot region to develop boundary transfer relations between individual turns. These relations are then used to create an impedance matrix from which the ac resistance can be calculated. This technique is more flexible than previous solutions since it can accommodate different winding configurations such as fractional-pitch windings. It is shown that a fractional-pitch winding has a lower ac resistance than a full-pitch winding. Finite-element analysis simulations and experimental results are used to validate the proposed method.

中文翻译：

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矩形导体定子绕组的计算高效交流电阻模型

在分析电机性能时，电机绕组的电阻是一个重要参数，因为绕组中的传导损耗通常是最大的损耗分量。然而，由于趋肤效应和邻近效应，这种电阻会随频率变化，因此很难准确估计这些损耗。在本文中，介绍了一种计算具有矩形导体的电机绕组的交流电阻的计算效率高的通用方法。该方法使用定子槽区域的一维磁准静态模型来开发各个匝之间的边界转移关系。然后使用这些关系创建一个阻抗矩阵，从中可以计算出交流电阻。这种技术比以前的解决方案更灵活，因为它可以适应不同的绕组配置，例如分数节距绕组。结果表明，分节距绕组比全节距绕组具有更低的交流电阻。有限元分析模拟和实验结果用于验证所提出的方法。