Abstract
The operating temperature of the magnetic coupler in wireless power transfer (WPT) systems for electric vehicles (EVs) determines the system reliability and service life. This paper studies the modeling and analysis of temperature characteristics of a general magnetic coupler. Firstly, a thermal circuit model is established to show the heat transfer of the magnetic coupler in the air. Secondly, the heating mechanism of the coil, core and aluminum (Al) shield plate is studied. The thermal power of each component is calculated, and the temperature distribution is qualitatively given based on the proposed thermal circuit model. Then, the temperature distribution of each component is simulated, and the results are consistent with the theoretical analysis. Finally, a 6.6 kW WPT prototype is set up, and the temperature of each component is measured after 30 minutes of operation. The temperature of the coil, 34.6 °C, is the highest among that of the coil, core, Al plate and coil base. The agreement between experimental results and the theoretical simulation results shows that the thermal field simulation can accurately predict the temperature of the magnetic coupler by reasonably setting the thermal power addition method.
Highlights
With clean energy as the power source, electric vehicles (EVs) have the advantages of pollution-free, noiseless operation and low maintenance cost [1], [2]
The temperature distribution of each component is given, the coil loss is regarded as the main heat source
Considering the issues of the current researches, two deficiencies can be found: 1) Thermal simulation is utilized to predict the temperature of the magnetic coupler
Summary
With clean energy as the power source, electric vehicles (EVs) have the advantages of pollution-free, noiseless operation and low maintenance cost [1], [2]. Some research results on temperature characteristics and heating mechanism of magnetic couplers have been proposed. The temperature distribution of each component is given, the coil loss is regarded as the main heat source. Considering the issues of the current researches, two deficiencies can be found: 1) Thermal simulation is utilized to predict the temperature of the magnetic coupler. B. THERMAL RESISTANCE CIRCUIT OF MAGNETIC COUPLER Due to the temperature difference, heat will be transferred within or between systems. The thermal circuit model helps analyze the heat transfer situation and gives the temperature characteristics of each component from a qualitative perspective. Only the qualitative analysis of the temperature conditions of the components of the magnetic coupler brought about by heat conduction will be conducted. Aeff is the equivalent conductive cross-sectional area and leff is the equivalent conducting path distance [28]
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