Abstract

This paper presents a new method for the layered equivalent modeling of slot winding in the stator of a flat wire motor to accurately study the thermal performance under steady-state conditions. The conventional equivalent model for flat wire winding involves treating the slot winding as a single copper rod for temperature analysis. This method is not applicable to flat wire motors under high-power density operating conditions. As the power density of the motor increases, the flat wire winding is more affected by skin effect and proximity effect, resulting in a sharp increase in AC loss and uneven distribution of losses in the slot winding. The conductor losses are highest near the slot opening, a characteristic that conventional model is unable to reflect. The proposed layered modeling method fully takes into account the characteristics of flat wire winding. This method involves adding interlayer insulation to divide the overall modeled conductor into layers and fully considers the thermal parameters, heat transfer characteristics, and distribution of materials within the slot to establish a new equivalent model for flat wire winding. Finally, the comparison of the results with the actual model and experimental tests demonstrates that this method effectively improves the calculation accuracy by 2.2% of the flat wire winding equivalent model.

中文翻译：

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扁线电机定子槽精确等效建模及热分析

摘要

本文提出了一种对扁线电机定子槽绕组进行分层等效建模的新方法，以准确研究稳态条件下的热性能。扁线绕组的传统等效模型是将槽绕组视为单根铜棒进行温度分析。该方法不适用于高功率密度运行条件下的扁线电机。随着电机功率密度的增加，扁线绕组受趋肤效应和邻近效应的影响更大，导致交流损耗急剧增加，且槽绕组损耗分布不均匀。槽口附近的导体损耗最高，这是传统模型无法反映的特性。所提出的分层建模方法充分考虑了扁线绕组的特点。该方法通过增加层间绝缘将整体建模导体分层，并充分考虑热参数、传热特性以及槽内材料的分布，建立新的扁线绕组等效模型。最后，将结果与实际模型和实验测试进行比较，结果表明该方法有效提高了计算精度，比扁线绕线等效模型提高了2.2%。