A Novel Model to Accurately Acquire Hot Spot Location in Hairpin End Winding of Oil-Cooled PMSM

A novel fluid-solid coupling model is presented to acquire hot spot locations, and methods to avoid hot spots are proposed. The novelty of the model is that it includes narrow gaps between windings as well as a whole 180° circular fluid field, which makes the calculation of hot spot locations more detailed and accurate. Furthermore, based on the fluid-solid coupling model and the volume of fluid (VOF) method, the hot spot locations are acquired when nozzle numbers different. Finally, methods to avoid the hot spots are provided according to the simulation results.