Thermal Analysis of the Motor Cooling Structure to Use ATF for Hybrid Electric Vehicle (HEV)

摘要

The motor cooling structure to use ATF (Automatic Transmission Fluid) is adopted in recent hybrid electric vehicle (HEV) for the cooling performance improvement. We analyzed details of the heat flow of this cooling Structure by the heat evaluation of each part in the motor. As a result, we clarified the effect of the thermal resistance decrease from generation of heat part to cooling water and air, and the effect of the cooling performance improvement in the motor by this cooling structure to use ATF.