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International Journal of Automotive Technology > Volume 22(5); 2021 > Article
International Journal of Automotive Technology 2021;22(5): 1397-1407.
RESEARCH ON THE DATA TRANSMISSION METHODS IN THE MAGNETO-THERMAL COUPLING MODEL FOR EDDY CURRENT BRAKING
Jinshan Tian1, Desheng Li1, Keyan Ning2, Lezhi Ye1
1Beijing University of Technology
2China North Vehicle Research Institute
PDF Links Corresponding Author.  Keyan Ning , Email. kyning@noveri.com.cn
ABSTRACT
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.
Key Words: Eddy current braking, Magneto-thermal coupling model, Thermal derating, Data transmission, Finite element method
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