2023,
IET Electric Power Applications.
DOI:
10.1049/elp2.12371
AC losses calculation of parallel multi‐strand flat wire windings for automotive drive motor
Peipei Yang, Yanping Liang, Jia Liu, Ke Zhang
Abstract:
Abstract Automobile drive motor with flat wire winding has improved the slot fill factor and efficiency. However, under the current environment of drive motors development to high frequency and voltage, the increase in winding AC loss has weakened those advantages. Accurate analysis of AC loss and the design of high‐performance windings have become the key issues and difficulties in the design process of drive motors. Based on the winding AC loss generation mechanism, the authors propose a winding AC loss analysis method, which can effectively separate DC loss, eddy current loss, and circulating current loss. The method is used to analyse winding AC loss of 60 kW flat wire winding permanent magnet synchronous motor (PMSM). In addition, parallel multi‐strand flat wire windings are proposed to reduce the winding AC loss and eliminate the limitation of the magnetic load of the motor on the selection of winding layers. The AC loss of the parallel multi‐strand flat wire windings at different frequencies is calculated, which demonstrates the effectiveness of the proposed winding topology in reducing the winding AC loss. In addition, the correctness of the simulation model was verified through experiments, and the loss calculation method was verified through finite element analysis.
2024-01-31 21:30:00
#paper doi:10.1049/elp2.12371 IET Power Electronics, 2023, AC losses calculation of parallel multi‐strand flat wire windings for automotive drive motor. 汽车驱动电机采用扁线绕组，提高了槽填充系数和效率。 然而，在当前驱动电机向高频化、高压化发展的环境下，绕组交流损耗的增加削弱了这些优势。交流损耗的准确分析和高性能绕组的设计已成为驱动电机设计过程中的关键问题和难点。基于绕组交流损耗产生机理，作者提出了一种绕组交流损耗分析方法，可以有效分离直流损耗、涡流损耗和环流损耗。该方法用于分析60 kW扁线绕线永磁同步电机（PMSM）的绕组交流损耗。此外，提出并联多股扁线绕组，以减少绕组交流损耗，消除电机磁负载对绕组层数选择的限制。计算了并联多股扁线绕组在不同频率下的交流损耗，这证明了所提出的绕组拓扑在降低绕组交流损耗方面的有效性。此外，通过实验验证了仿真模型的正确性，并通过有限元分析验证了损耗计算方法。
本文提出了一种准确分析绕组交流损耗的方法。基于该方法，计算了60kW永磁同步电机扁线绕组的交流损耗，并提出了一种可降低绕组交流损耗的高性能绕组结构。得到以下结论。
1）所提出的绕组交流损耗分析方法有效地分离了直流损耗、涡流损耗和环流损耗。该方法解决了绕组交流损耗成分分离的问题，可以考虑不同温度、频率、层数对绕组交流损耗的影响。为绕组交流损耗的研究提供了理论基础。
2）随着温度升高，绕组的直流损耗增大，而涡流损耗减小。另一方面，增加激励频率会导致涡流损耗和环流损耗增加。
3）增加绕组层数可以减少扁线绕组的涡流损耗。绕组中的涡流损耗始终在最接近槽口的导体中最大，约占总涡流损耗的60%。绕组EC损耗随着层数的增加而减小，8层绕组的涡流损耗比4层绕组降低了48.77%。
4) 绕组分成的股数越多，涡流损耗减少得越多，但产生的环流损耗也越多。通过采用端部绕组换位技术，可以有效抑制环流损耗，而涡流损耗的变化基本保持不变。所提出的并联多股扁线绕组在峰值速度下最大可降低26.28%的交流损耗，这证明所提出的绕组可以在不改变绕组层数的情况下有效地降低绕组交流损耗。