전기자동차 구동모터의 자기포화와 온도변화를 고려한 1D 모델링과 시뮬레이션

Abstract

This study proposes 1D simulation model of electric vehicle whose objective is to consider both magnetic saturationand varying temperature of permanent magnet traction motor during operation. The electromagnetic parameters such astorque and losses are determined from maps constructed in advance by finite element analysis at different combinations of current, motor speed and permanent magnet temperature. The temperature change of the motor is calculated using lumped parameter thermal network (LPTN), which is computationally efficient model for thermal analysis of motor. Asthe LTPN is integrated in the simulation model, iterative process of analyzing the operating scenario is not required. Appling the proposed model to Worldwide Harmonised Light Vehicle Test Procedure (WLTP) class 3 driving cycle, it is confirmed that the model reflects varying efficiency of the motor depending on the temperature well. Also, reasonable time is spent on both preparing maps and simulation.