电磁热耦合分析是一种计算永磁同步电机电磁性能和热性能的有效方法，为实现耦合场的高效准确计算，建立了一种结合二维静磁场有限元模型和等效热网络模型的电磁热耦合高效计算模型。首先，基于磁密时空变换公式，推导了考虑材料温升特性的电磁损耗计算模型，并与二维时步有限元法进行对比，相同硬件条件下，计算时间减少约79%；然后，基于传热学定律，建立了电机的等效热网络温度场分析模型，并推导了节点温升计算的状态空间方程。最后，以一台表贴式永磁电机为例，与三维有限元耦合模型进行对比，温度场计算结果最大误差为5.3 K，计算时间减少约95.2%，表明该模型可在保证计算精度的前提下提高电磁热耦合分析效率。
Electromagnetic-thermal coupling field analysis is a powerful tool to analyze electromagnetic and thermal performance of permanent magnet synchronous motor (PMSM). In order to efficiently and accurately calculate the coupling field, an electromagnetic-thermal coupling model based on 2D magnetostatic finite-element analysis（FEA） and lumped parameter thermal network (LPTN) was established. Firstly, based on the flux density space-time transformation, electromagnetic loss model considering the temperature characteristics of materials was built and compared with 2D time-step FEA, the calculation time was reduced by about 79% under the same hardware condition. Secondly, the equivalent thermal network method was established based on the heat transfer laws, and the state space equation for nodes temperature-rising calculation was derived. Finally, the proposed coupling field was compared with the 3D FE coupling model on a surface-mounted PMSM, the maximum error of temperature field is 5.3 K and the calculation time was reduced by about 95.2%. The result shows that the proposed model greatly reduces the computation time under the premise of ensuring the accuracy.
2023,45(17): 118-124 收稿日期：2022-07-23
DOI：10.3404/j.issn.1672-7649.2023.17.023
分类号：TM351
基金项目：国家自然科学基金资助项目(52107063)
作者简介：刘佳豪(1998-),男,硕士研究生,研究方向为永磁电机的分析与设计
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