Development of Direct Cooling Stator Structure Using High Thermal Conductive Epoxy Molding Compounds

This paper presents an effort to realize a stator with a direct cooling coil structure as a solution for a drive motor in the trend to promote electrification of automobiles. A channel made of high thermal conductivity epoxy molding compounds is installed in the slot of the stator to achieve direct cooling of the coil. After optimizing the stator shape and water channel shape by electromagnetic field analysis and thermal analysis, we were able to confirm that this structure can be fabricated by molding with a mock-up mold.