To improve electric vehicle (EV) mileage, motors must be designed for higher power density and efficiency. Winding technology with a high fill factor decreases the motor volume by reducing the unnecessary area of the slot. A motor conductor with a large cross-sectional area generates additional losses due to ac resistance, reducing the efficiency of the motor. Traction motors designed under these conditions can adversely affect EV fuel economy. Therefore, a design method is proposed to reduce the ac resistance of a traction motor by applying winding technology with a high fill factor to increase the fuel economy of the EVs. First, the characteristics and manufacturing process of the maximum slot occupation (MSO) coil, which is a winding technology with a high fill factor, are introduced. An ac resistance reduction method for a motor using an MSO coil is then proposed. Additionally, a motor designed using the proposed method is presented, and its electrical performance is compared with that of an initial motor. Next, the effect of the fuel economy improvement of the presently designed traction motor is verified through a vehicle simulation, and the validity of this article is experimentally confirmed using this motor.

中文翻译：

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使用高填充系数线圈降低牵引电机交流电阻提高eBus燃油经济性的设计方法

为了提高电动汽车 (EV) 的行驶里程，电机的设计必须具有更高的功率密度和效率。具有高填充系数的绕组技术通过减少不必要的槽面积来减小电机体积。由于交流电阻，具有大横截面积的电机导体会产生额外的损耗，从而降低电机的效率。在这些条件下设计的牵引电机会对电动汽车的燃油经济性产生不利影响。因此，提出了一种设计方法，通过应用具有高填充系数的绕组技术来降低牵引电机的交流电阻，以提高电动汽车的燃油经济性。首先，介绍了具有高填充系数的绕线技术——最大槽位占用（MSO）线圈的特点和制造工艺。然后提出了一种使用 MSO 线圈的电机交流电阻降低方​​法。此外，还介绍了使用所提出的方法设计的电机，并将其电气性能与初始电机的电气性能进行了比较。接下来，通过车辆仿真验证了当前设计的牵引电机的燃油经济性提高效果，并使用该电机通过实验验证了本文的有效性。