摘要
以一台400W离网式风力发电机组永磁同步发电机为例,建立了发电机二维稳态电磁场物理模型,采用有限元方法计算了样机在不同转速时的输出电压特性。基于傅里叶导热和牛顿放热定律,利用数值与解析相结合的方法,计算了机壳表面传热系数,为风力发电机的表面传热系数计算提供了新思路。在传热学理论基础上,以电磁分析得到的损耗为热源,建立了电机的二维温度场物理模型。对样机在不同风速时的温度场进行计算与分析,得出在不同风速与负载情况下的电机温度分布。开展了电磁与热性能试验研究工作,将计算值与试验值进行对比分析,为离网型永磁同步风力发电机温度场的研究提供理论基础。
Taking a PM synchronous generator used in 400W off-grid type wind power generation system as an example,the 2-D physical model for steady-state electromagnetic field of the generator is established.The output voltage characteristics of prototype operating under different speeds are calculated by element finite method.Based on the Fourier heat conduction law and Newton heat dissipation law,a new method is given to calculate the surface coefficient of heat transfer,which provides a new idea for calculating it.Then,using the losses determined from electromagnetic analysis as a heat sources,the 2-D temperature field model is established on the basis of the heat transfer theories.By calculation and analysis on temperature fields of prototype operating with different loads under different output,the temperature distributions are obtained.Experiment studies of electromagnetic field and temperature field are carried out,which can provide a theoretical basis for the thermal analysis of off-grid type PM synchronous generator by comparison with the calculation results.
出处
《防爆电机》
2011年第3期1-6,共6页
Explosion-proof Electric Machine
关键词
离网式风力发电
多风速
电磁场
温度场
表面传热系数
Off-grid type wind power generation
multi-speed of wind
electromagnetic field
temperature field
surface coefficient of heat transfer
