以某自扇冷式牵引电机为例，采用计算流体力学的方法分析了通风系统的风阻、风量、流速、风扇机械损耗以及气动噪声，并进行了试验验证。结果表明，提高风扇内气流的均匀性和稳定性，减少风扇涡流，可以明显改善风扇性能、降低风扇损耗，明显降低电机气动噪声，显著提高电机效率，提高电机的性能。采用的计算分析方法和所得结论对风扇性能改进具有一定的参考意义。

Taking a self-fan-cooling traction motor as an example, the wind resistance, air volume, flow rate, mechanical loss and aerodynamic noise of the motor ventilation system are analyzed by using computational fluid dynamics (CFD) method, and the experimental verification is carried out. The results show that improving the uniformity and stability of the air flow in the fan and reducing the fan vortex can significantly improve the fan performance and reduce the fan loss. After optimization, the aerodynamic noise of the motor is obviously reduced and the efficiency of the motor is significantly improved, improving the performance of the motor. The calculation and analysis method and the conclusion have certain reference significance for the improvement of motor fan performance.