The eddy current braking (ECB) is often installed on heavy-duty vehicles as the auxiliary braking component. When it works for a long time, the thermal derating of braking torque will reach about 18.5 % due to high temperature. It is important to establish an accurate magneto-thermal coupling model for the ECB high-temperature steady-state braking torque prediction. In multi-field coupling calculation, there are two commonly used data transmission methods between two physics fields. One of them is transmitting average data to important geometry based on the idea of lumped parameters (lumped parameters method), and the other is mapping the data distribution to each grid cell (direct mapping method). This paper takes the ECB as the research object, analyzes the influence of the above two data transmission methods, and proposes to replace the fluid-thermal coupling model with the heat conduction model in the magneto-thermal coupling model. Through calculation and analysis, using the lumped parameters method to transmit the heat generation rate, temperature and convective heat transfer coefficient all have a certain impact on the calculation accuracy of the coupling model comparing with the direct mapping method.

涡流制动（ECB）通常安装在重型车辆上作为辅助制动部件。长时间工作时，由于高温，制动转矩的热降额会达到18.5%左右。建立准确的磁热耦合模型对于 ECB 高温稳态制动扭矩预测非常重要。在多场耦合计算中，两个物理场之间有两种常用的数据传输方式。一种是基于集总参数的思想（集总参数法）将平均数据传输到重要的几何体，另一种是将数据分布映射到每个网格单元（直接映射法）。本文以欧洲央行为研究对象，分析了上述两种数据传输方式的影响，并提出在磁热耦合模型中用热传导模型代替流体-热耦合模型。通过计算分析，与直接映射法相比，采用集总参数法传递的发热率、温度和对流传热系数对耦合模型的计算精度都有一定的影响。