Abstract: In order to study the sensitivity of skin effect on the number of flat wire layers and its impact on the high-speed efficiency of new energy vehicle flat wire drive motors, a motor with a peak power of 220 kW and a rated power of 90 kW is selected as the research object in this paper. By combining analytical calculation and finite element calculation methods, the resistance increase coefficients of each winding conductor based on four, eight layers of windings are comprehensively analyzed, as well as the influence of skin effect on the motor under high-speed operating conditions. Through the comparison of analytical method and finite element calculation, it is concluded that the calculation results of the two methods are similar, with the same trend. The results show that as the speed increases, the skin effect has a significant impact on the efficiency and heating of the motor. The current increases radially along the motor towards the slot position, causing the temperature rise of the winding conductor at the slot position to increase. Furthermore, it significantly increased the rotor temperature, providing a certain reference for the design and optimization of flat wire drive motors for new energy vehicles.

Key words: Flat wire motor; Skin effect; Coefficient of increase in AC resistance; Finite element calculation

摘要： 为研究新能源汽车扁线驱动电机集肤效应对扁线层数的敏感性及其对电机高速效率的 影响，文章以一台峰值为 220 kW，额定功率为 90 kW 电机为研究对象，结合解析计算和有限 元计算方法，综合分析了基于四层、八层绕组，各个绕组导体的电阻增加系数，以及集肤效 应对电机在高速转速工况下的影响。通过解析法和有限元计算的对比，得出二者计算结果接 近，趋势相同的结论，结果表明随着转速的提升，集肤效应对电机的效率及发热影响显著， 电流沿着电机径向，向槽口位置增加，使得槽口位置的绕组导体温升升高，进而大幅度提高 了转子温度，为新能源汽车扁线驱动电机的设计和优化，提供了一定的参考。

关键词: 扁线电机；集肤效应；交流电阻增加系数；有限元计算