Cooling system design optimization of an enclosed PM traction motor for subway propulsion systems

This paper presents the design optimization of a self-circulated ventilation system for an enclosed permanent magnet (PM) traction motor utilized in propulsion systems subway trains. In order to analyze accurately machine's inherent cooling capacity when train is running, ambient airflow and related heat transfer coefficient (HTC) are numerically investigated considering synchronously bogie installation structure. The machine preliminary cooled with air ducts set on shell, fluidic-thermal field distributions only shell duct calculated. During simulations, HTC obtained former steps applied external surface model characteristic caused by movement. To reduce temperature rise thus guarantee motor's working reliability, internal proposed according distribution. end-caps driven blades mounted both sides rotor core forms two circuits bring excessive power losses generated heating components cool regions. fluid flow system's structural parameters further improved Taguchi method confirm efficacy system.