基于棱边元法的永磁风力发电机沟槽电磁及热分析  

ELECTROMAGNETIC AND THERMAL ANALYSIS OF PERMANENT MAGNET WIND GENERATOR GROOVE BASED ON EDGE ELEMENT METHOD

作　　者：温彩凤[1,2] 汪建文[1,2] 孙素丽[1] 

机构地区：[1]内蒙古工业大学能源与动力工程学院,呼和浩特010051 [2]风能太阳能利用技术省部共建教育部重点实验室,呼和浩特010051

出　　处：《太阳能学报》2014年第9期1749-1756,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50976047);内蒙古自治区自然科学基金重大项目(2012ZD08)

摘　　要：以400 W试验样机在额定风速下不同尖速比对应的实际输出电流作为激励,对电机沟槽采用棱边有限元法(EFEM)由矢量插值函数直接求解三维瞬态及谐态磁场矢量,保证磁场矢量在单元交界处应有的切向连续,分别计算32槽8极电机梨形槽、斜肩圆底槽及扇形槽的不同定子结构磁场强度和涡流损耗;通过物理场文件转移载荷法将电磁场计算结果作为温度场载荷进行转移的间接耦合方式,迭代计算后读取结果文件获得磁通密度、磁场强度矢量及热流密度分布。分析表明EFEM计算电机沟槽电磁特性及传热特性有较高的准确性和有效性,且涡流损耗产生的焦耳热引起的温度梯度较大,使得磁场的强度和方向均发生改变。This research adopted the actual output current of the 400 W experimental prototype in rated wind speed un- der different tip speed ratio as an incentive, and solved directly three dimensional transient and harmonic magnetic field vector components for motor groove by the vector interpolation function using edge finite element method （EFEM）, and ensured that the magnetic field vector was tangentially continuous at the cell junction, and then calculated separately pear-shaped groove, oblique round-bottomed groove and fan-shaped groove magnetic field intensity and eddy current loss for 32 grooves 8 pole motor; this study based on the physical field file transfer load method belonging indirect coupling method to transfer electromagnetic field calculation results to temperature field as its load, after iterative calculation, and read the final outcome documents to obtain magnetic flux density, magnetic field intensity vector and heat flux distri- butions. Results showed by eventually analysis that the EFEM has higher accuracy and efficiency as a method to calcu- late the generator groove electromagnetic properties and heat transfer characteristics, and there is larger temperature gra- dient attributing to joule heat that was generated by eddy current loss, which has changed magnetic field strength and di- rection.

关 键 词：永磁风力发电机 棱边元法 涡流损耗 磁矢量载荷 耦合 热流密度 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]