Effect of insulation property and distribution of turbo generator rotor on temperature field

In order to reduce the thermal conduction resistance inside the rotor, improve the heat transfer ability and reduce the peak temperature for the safe operation of the electric machine, a three dimensional model of air turbulent flow and heat transfer at steady state was present. The model equations were solved by the finite volume method, based on computational fluid dynamics principle (CFD). The effect of thermal conductivity of the rotor insulation, the thickness and distribution of the interturn insulation on the rotor peak temperature was analyzed. The results illustrated that the effect of thermal conduction resistance on the peak temperature was not obvious. Finally, the optimization results of insulation thermal conductivity and distribution were obtained. The conclusion was helpful for rotor insulation design of large capacity turbo generator.