根据自扇风冷型地铁永磁牵引电机对冷却效果和气动噪声抑制的平衡设计要求，对分别采用两款冷却风扇的某一地铁永磁牵引电机的冷却效果和气动噪声进行数值分析和试验研究。两款风扇的主要差别在风扇外径，风扇B的外径比风扇A小约23%。研究结果表明，与风扇A相比,风扇B在电机风道内引起的风量、静压和消耗功率分别降低29%、47.4%和53%。在电机额定运行工况下，流量降低使电机温升增加约9 K，其满足电机温升设计要求，而相应的气动噪声降低3.3 dB（A），具有良好的降噪效果。

According to the balance design requirements of self-fan air-cooling metro permanent magnet traction motor for cooling effect and aerodynamic noise suppression, the cooling effect and aerodynamic noise of a metro permanent magnet traction motor with two cooling fans are numerically analyzed and experimentally studied. The main difference between the two fans is the outer diameter of the fan. The outer diameter of fan B is about 23% smaller than that of fan A. The research results show that compared with fan A, the ventilation quantity, static pressure and power consumption caused by fan B in the motor air duct are reduced by 29%, 47.4% and 53% respectively. Under the rated operating condition of the motor, the temperature rise of the motor caused by the flow reduction increases by about 9 K, which meets the design requirements of the motor temperature rise, and the corresponding aerodynamic noise is reduced by 3.3 dB(A), which has a good noise reduction effect.

湖南省创新型省份建设专项科研项目(2022GK2062)