Study on flow field of oil-cooling permanent magnet synchronous motor with hairpin winding using porous medium model

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-06-24 DOI:10.1049/elp2.12462

Chen Yang, Wei Cai, Baicheng Shao

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Abstract

The oil cooling method has been widely used in the permanent magnet synchronous motor with hairpin winding. Because of the irregular shape of the hairpin end winding, there are complex oil circuits in the fluid domain, resulting in a large number of grids and a high computational cost. It is still a challenge to calculate the oil-cooling performance of the hairpin end winding. Therefore, the porous medium model (PMM) is first proposed to replace the real hairpin end winding to analyse the oil-cooling performance. By comparing oil volume fraction and velocity at different oil-supplied conditions using three methods: experiments, real model (the non-equivalent fluid domain model based on the real hairpin end winding) and PMM, the feasibility of using the PMM to calculate the oil-cooling performance on the end winding is verified. The oil distribution of three methods is the same. The use of the PMM saves 80% of the number of grids, which improves the simulation efficiency. Relationships between the porosity, permeability and resistance coefficient and the geometry parameters of windings are determined. The results show that the flow field changes greatly with changes in porosity, permeability and resistance coefficient.

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利用多孔介质模型研究带发夹绕组的油冷永磁同步电机的流场

油冷却方法已广泛应用于带发夹绕组的永磁同步电机。由于发夹端绕组的形状不规则，流体域中存在复杂的油路，导致网格数量大，计算成本高。如何计算发夹末端绕组的油冷却性能仍是一个难题。因此，首先提出了多孔介质模型（PMM）来代替真实的发夹端绕组分析油冷却性能。通过使用实验、真实模型（基于真实发夹式末端绕组的非等效流体域模型）和多孔介质模型三种方法比较不同供油条件下的油体积分数和速度，验证了使用多孔介质模型计算末端绕组油冷却性能的可行性。三种方法的油分布相同。使用 PMM 节省了 80% 的网格数量，提高了模拟效率。确定了孔隙率、渗透率和阻力系数与绕组几何参数之间的关系。结果表明，随着孔隙率、渗透率和电阻系数的变化，流场也会发生很大变化。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.