Thermal analysis of axial‐radial hybrid ventilation motor and stator ventilation channel improvement

Abstract The stator ventilation channel is the key component that affects the cooling capability of the axial‐radial hybrid ventilation motor (ARHVM). To study the influence of the stator ventilation channel on fluid flow and temperature distribution in the ARHVM, taking a 500 kW medium‐sized high‐voltage ARHVM as the research object, the global calculation model of the ARHVM, including the external cooler, was established. The flow characteristics and temperature distribution of the motor were obtained using finite element analysis, and the calculated results were validated through test data. In addition, in view of the vortex phenomenon that hinders fluid flow in the stator radial ventilation duct, this study proposes a new type of stator ventilation channel structure, which can improve the fluid flow pattern and effectively suppress the vortex phenomenon. Compared with the original linear ventilation channel, the temperature of the stator region can be decreased by 1–2.5℃ via the new stator ventilation channel.