Yu Yang, Li Siyuan, Weng Ling, Zhang Xiaorui, Liu Laiweiqing, Chen Qingguo
Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin 150080, China.
School of Electrical and Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China.
Polymers (Basel). 2025 Apr 8;17(8):1002. doi: 10.3390/polym17081002.
The performance of enameled wires has an important impact on new energy vehicle motors. The mainstream practice of existing technology is to improve partial discharge inception voltage (PDIV) by doping powder to inhibit corona and increase varnish thickness, the limitations of which are also obvious. Powder doping has the problem of dispersion stability, and increasing the varnish thickness affects the size and power density of the motor. In this paper, a novel insulation structure design was given. The electronic field stress was controlled by using different dielectric constant materials, and the dielectric constants can be controlled by adjusting the free volume of the polymer. Finally, we specifically create a preparation scheme to increase the corona voltage and the PDIV, without a loss of the breakdown margin of the enameled wire, and the simulation results show that the outermost electric field strength of the enameled wire model decreases by 22.11% and the enameled wire breakdown margin increases by 26.85%.
漆包线的性能对新能源汽车电机有重要影响。现有技术的主流做法是通过掺杂粉末抑制电晕来提高局部放电起始电压（PDIV）并增加漆层厚度，但其局限性也很明显。粉末掺杂存在分散稳定性问题，增加漆层厚度会影响电机的尺寸和功率密度。本文给出了一种新颖的绝缘结构设计。通过使用不同介电常数的材料来控制电场应力，并且可以通过调节聚合物的自由体积来控制介电常数。最后，我们专门制定了一个提高电晕电压和PDIV的制备方案，且不损失漆包线的击穿裕度，模拟结果表明漆包线模型的最外层电场强度降低了22.11%，漆包线击穿裕度提高了26.85%。
