Thermal Design and Analysis of Oil-Spray-Cooled In-Wheel Motor Using a Two-Phase Computational Fluid Dynamics Method

In-wheel motors for new energy vehicles are close to the brake, which results in a high ambient temperature. Thus, there is demand cooling systems. This paper designs an oil-spray-cooled system based on flat structural characteristics of in-wheel motor. A computational fluid dynamics method with two-phase volume-of-fluid model applied simulate transient process oil spraying from nozzles onto stator carrier and then dripping end windings. The spatially distributed interfaces location shape fidelity derived. Considering big difference thermal inertia between motor solid fluid, mixed timescale calculate temperature fields solid. Finally, prototype fabricated tested verify proposed oil-cooling simulation method.