Electromagnetic-Thermal Field Coupling Calculation of Contactless Power Transfer Vehicle

The application of contactless power transfer technology in urban rail transit has attracted more and more attention. However, there are still many problems to be addressed in the practical application of high-power contactless network power supply technology, among which the eddy current heating problem caused by electromagnetic induction is one of major concerns. In this work, an electromagnetic induction heating model of contactless power transfer vehicle is established according to the electromagnetic induction principle and the heat transfer theory. Using the finite element method, the thermal field distribution of the contactless power transfer vehicle is calculated, and numerical simulations of vehicle heating under different load conditions are performed. In addition, the heat dissipation performance of the receiving coils with radiator and air cooling is compared. Results show that the temperatures of both the receiving coils and bogie rise significantly. As the current of the transmitting coils increases and the distance of the air gap decreases, the temperature of each part of the vehicle has an upward trend. The maximum temperature of the receiving coils with the radiator is 126 ℃ lower than that without the radiator, and the performance of the radiator can be further improved by changing its heat transfer coefficient. Meanwhile, the temperature of the receiving coils with air cooling is reduced by 131.2 ℃. Compared with the radiator, the air-cooling heat dissipation performance is slightly better, and the air-cooling effect is more prominent as the wind speed increases.