ABSTRACT
Due to the axial symmetry of the rotor and the axial size was much larger than the rotor thickness, the following assumptions were made. (1) Heat generation evenly distributed within the heat zone V1. (2) The rotor satisfied the homogeneous, isotropic material. (3) The axial temperature gradient was zero. (4) Thermal conductivity, density and the specific heat of material did not change with temperature. (5) Ignore the volume change of cell caused by temperature. (6) Considered that air gap between the rotor and stator and heat dissipation from it were small, so the inner surface satisfied the adiabatic boundary condition.
