Electric vehicle (EV) systems require a high energy-efficiency traction motor so that the motors for EV traction should achieve high efficiency and power density. Hence, a permanent magnet synchronous motor (PMSM) for EV traction using a maximum slot occupation (MSO) coil has been investigated in this study. By applying the MSO coil, high torque density was achieved, but an additional loss, which decreases the efficiency, was incurred through alternating current (AC) resistance. To reduce the AC resistance of the MSO coil, the following process was performed: First, by investigation using the analytical method, pole/slot numbers, current density and number of parallel circuits affecting the frequency, the shape and number of conductors were chosen as important variables. Resistances of the MSO coil with a stator core were analyzed according to the chosen variables above. From the results, MSO coil applied PMSM with proper pole/slot numbers, current density, and parallel circuits was determined to improve the efficiencies at the base and maximum speeds. To accurately estimate the efficiency of the determined model, loss evaluation methods were explained. Subsequently, the determined MSO coil applied model was compared with the conventional model having round wires, and the improvements were verified by load testing.

中文翻译：

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考虑交流电阻的重型EV牵引用高缝隙填充系数线圈的高效PMSM

电动汽车（EV）系统需要高能效的牵引电动机，因此用于EV牵引的电动机应具有较高的效率和功率密度。因此，在这项研究中，已经研究了使用最大缝隙占用（MSO）线圈的用于EV牵引的永磁同步电动机（PMSM）。通过使用MSO线圈，可以实现高转矩密度，但是由于交流（AC）电阻会导致附加损耗，从而降低效率。为了降低MSO线圈的交流电阻，执行了以下过程：首先，通过使用分析方法进行研究，选择极数/槽数，电流密度和影响频率的并联电路数，导体的形状和数量。重要变量。根据上面选择的变量分析了具有定子铁心的MSO线圈的电阻。根据结果​​，确定了MSO线圈在PMSM上使用适当的极数/槽数，电流密度和并联电路，以提高基本速度和最大速度时的效率。为了准确估计确定模型的效率，介绍了损失评估方法。随后，将确定的MSO线圈应用模型与具有圆线的常规模型进行比较，并通过负载测试验证了改进。损失评估方法进行了解释。随后，将确定的MSO线圈应用模型与具有圆线的常规模型进行比较，并通过负载测试验证了改进。损失评估方法进行了解释。随后，将确定的MSO线圈应用模型与具有圆线的常规模型进行比较，并通过负载测试验证了改进。