부산대학교 도서관

In this paper, for the cooling problem of high-power density automotive permanent magnet synchronous motors, the heat dissipation performance of the three structures of water-cooled, oil-cooled and oil-water composite cooling, and their effects on the performance of the motor are studied. By analyzing the loss distribution of the motor, the heat dissipation performance of different cooling structures under each working condition is calculated, and the maximum output capacity of the motor under the optimal cooling method is explored. The results show that the oil-water composite cooling structure can significantly reduce the motor temperature and improve the heat dissipation ability of the motor, thus increasing the peak power and peak torque of the motor. Under the oil-water composite cooling method, the peak power of the motor can be increased to 427.7kW and the peak torque can be increased to 384.8Nm, which are increased by 13.8% and 9.8% respectively. This shows that the oil-water composite cooling structure not only improves motor performance, but also has the potential to further miniaturize the motor. This study provides an important reference for the design of cooling systems for high-power density permanent magnet motors.