基于流体传热理论永磁风力发电机温度场计算

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

采用流体传热理论和有限体积法计算自然风冷式兆瓦级永磁同步风力发电机的三维温度场。确定热源及等效导热系数的计算方法,建立三维流体的数学模型;对一台实验样机建立三维流动与传热耦合计算的模型,并通过与实验结果的对比,验证计算方法的合理性。利用相同方法对一台1.5 MW永磁同步风力发电机的三维温度场进行计算与分析,在此基础上,根据大功率永磁风力发电机的实际运行特点,计算该发电机额定风速下额定负载运行时的三维温度场分布,并绘制了不同环境温度时电机额定状态下各部分的温度变化图。仿真计算在不同风速下发电机的温度分布。

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.