在某城轨车辆设计定型过程中，由于整体布置的限制使冷凝风机被遮挡。为评估该遮挡对整个冷却回路散热能力的影响，借助基于STAR CCM+的三维仿真手段结合多种一维校核方法，对电机冷却系统的潜在风险进行评估。在当前整体布置对冷凝风扇进风量影响为11.4%的情况下,对电机冷却系统的潜在风险进行校核分析后发现散热器仍具有足够余量，风险可控。通过该研究，发展出针对电机冷却系统工况的评估方法。

During the design and finalization process of an urban rail vehicle, the condensing fan was sheltered due to the limitation of the overall arrangement. In order to evaluate the influence of the shielding on the heat dissipation capacity of the whole cooling loop, the potential risk of the motor cooling system is evaluated with the help of 3D simulation method based on STAR CCM+ combined with a variety of 1D verification methods. When the current overall arrangement has an impact of 11.4% on the air intake of the condensing fan, after checking and analyzing the potential risk of the motor cooling system, it is found that the radiator still has sufficient margin and the risk is controllable. Based on this, an evaluation method for the working condition of the motor cooling system is developed.