Investigation of the heat characteristic based on the exergy destruction rate for high power density motor

A novel thermal network analysis method is introduced to investigate heat characteristic of high power density motor YJKK-500-4 in the paper. According to the special structure of motor and the related theories, and the influence of the motor cooler, radial ventilation channel, air gap and air flow in the rotor field spider to the motor temperature rise is fully considered, the thermal network model is established. And each node temperature of single motor is solved by energy balance equation. Then the exergy destruction rate in the Second Law of Thermodynamics is introduced to analyze the heat transfer characteristic of each motor component in the paper by the thermal network method. The exergy destruction rate analysis can be used to determine the heat transfer efficiency of the motor components, and can also provide a diagnostic tool for optimizing the cooling effect of the motor.