Heat Transfer Characteristics of Oil Jet Impingement Cooling on a Stator Segment Exterior Surface for Traction Motors With Concentrated Windings

This article addresses the heat transfer characteristics of an oil jet impingement cooling on a stator segment exterior surface, which is evaluated for use in a traction motor with concentrated windings. The fluid flow on the segment exterior surface and its heat transfer coefficient (HTC) are estimated using computational fluid dynamics (CFDs) based on a meshless moving particle simulation (MPS) method. The temperature distribution of a stator segment is then analyzed using finite element analysis (FEA) with the assistance of HTC mapping provided by CFD. Finally, experiments are conducted to validate the results obtained from numerical models and to assess the impact factors on the cooling performance, such as the inlet oil flow rate, inlet oil temperature, jet to segment distance, and segment inclined angle. For the first time, this study identifies and evaluates the key parameters influencing oil jet impingement cooling on the segmented stator’s exterior surface by coupling meshless CFD and FEA simulations, significantly reducing overall simulation time. This comprehensive analysis provides valuable insights for future implementation in a complete motor system.