Calculation of temperature field of PM generator for wind turbine based on theory of fluid heat transfer

Theory of fluid heat transfer and 3-D finite volume method were used to calculate the temperature field of megawatt scale permanent magnet synchronous generator for wind turbine with natural ventilation cooling.Firstly,the calculation methods for heat source and the equivalent heat transfer coefficient were given;a 3-D fluid mathematic model was established.Secondly,the model of the test prototype machine for fluid and temperature coupling analysis was established.Compared with the experimental data,the correctness of the calculation model was verified.The 3-D temperature field of a 1.5 MW half-direct permanent magnet synchronous generator for wind turbine was calculated by the same method.Based on the operational features of large power permanent magnet synchronous generator for wind turbine,the 3-D distribution of temperature field was computed when the generator running in the rated wind speed with the rated load.And the graph of temperature change when generator running with rated load in different environment temperature was drawn.At last,the distributions of temperature which generator running in different wind speeds were calculated.