铁耗和环流损耗分布对定子温度场及绝缘外表面散热系数计算的影响

以150 MW空冷汽轮发电机为例，建立电机二维电磁场数学模型，利用有限元方法对电机定子基本铁耗及其分布进行计算与分析，在此基础上对定子温度场进行计算，并与传统方法铁耗均匀分布情况下的温度场进行比较，给出了铁耗分布对定子温度场的影响；研究了计及每根股线的环流损耗与环流损耗平均分布2种方案下的定子温度场。在考虑上述基本铁耗和环流损耗的基础上，提出基于傅里叶导热定律和牛顿放热定律的通风沟内主绝缘外表面散热系数计算新方法，为电机与电器的表面散热系数计算提供了新思路。

Influence of Distributions of Circulation Losses and Iron Losses on Stator Temperature Field and Heat Transfer Coefficient’s Calculation of Outer Surface of Insulation

Taking a 150 MW air-cooled turbine-generator as an example, the 2-D electromagnetic field mathematical model was established. Finite element method was used to calculate the distribution of stator basic iron loss. Based on above work, the temperature field of the stator was calculated and the result was compared with that got using traditional method. The influence of the iron loss distribution on stator temperature field was given. Two schemes, the circulation loss of each strand and average circulation loss were taken into account respectively, were researched. The stator temperature field was given. Based on the above-mentioned circulation losses and iron losses, a new method of calculating heat transfer coefficient of insulation outer surface in the ventilation ducts based on Fourier's Law and Newton's Law was put forward. The new method provides a new way of calculation about heat transfer coefficient of surfaces of the electric machines and appliances.