To address localized overheating and low cooling efficiency in lightweight asynchronous traction motors for high-speed electric multiple units

a 600 kW air-cooled traction motor was selected as the research object

with analyses performed using heat transfer and computational fluid dynamics methods. Firstly

a fluid-solid conjugate model matching the motor's internal fluid distribution and component temperature variation laws was established

and the calculation error met engineering requirements. Secondly

the correlation between the temperature of heat-sensitive components and local fluid characteristics was analyzed

and a wind-guided ramp circulation ring was proposed for axial airflow regulation and targeted hotspot suppression. Precisely aligned with the circulation distortion zone near winding end-part 1 in the rear cavity

the structure's cooling performance was experimentally validated using a high-temperature resin motor model with heating elements. Further

based on non-magnetic material selection

its impact on the maximum temperature and axial temperature difference of key components was studied. The targeted suppression mechanism was elucidated by analyzing airflow near the surface of winding end-part 1 and temperature variations of windings in specific slots. Finally

through local sensitivity analysis of temperature reduction and flow distribution

the cooling effects of ramp height H

extension length B

and ramp length L were quantified. The results show that ramp height exhibits the strongest hotspot suppression capability.