Analysis and calculation of the 3D rotor temperature field of a generator-motor

This paper builds the mathematical model for the rotor temperature field of a generator-motor. The solved region for the temperature field is simplified according to the symmetry in geometry. Based on the assumptions of the solved region and taken into account the difference between the rotor´s windward side and leeward side, the rotor temperature fields are calculated by 3D Finite Element Method. The steady temperature distributions are obtained under three operating modes, and the transient temperature curves are plotted under the asymmetry operation and the double rated excitation operation. The results show that the rotor temperature is within the range of the permissible temperature of designed insulation and has enough tolerance.