基于棱边元法的永磁风力发电机沟槽电磁及热分析
发布时间：2019-03-07 22:03
【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。
[Abstract]:Taking the actual output current corresponding to different sharp speed ratios at rated wind speed as excitation, the finite element method (EFEM) with edge is used to solve the three-dimensional transient and harmonic magnetic field vectors directly from vector interpolation function in the grooves of the motor. To ensure the tangential continuity of the magnetic field vector at the junction of the unit, the magnetic field intensity and eddy current loss of different stator structures of 32-slot 8-pole motor, 12-pole 8-pole motor, 3-pole groove with inclined shoulder and fan groove are calculated respectively. Through the physical field file transfer load method, the electromagnetic field calculation results are regarded as indirect coupling mode of temperature field load transfer. After iterative calculation, the magnetic flux density, magnetic field intensity vector and heat flux density distribution are obtained by reading the result file. The analysis shows that EFEM has high accuracy and effectiveness in calculating the electromagnetic and heat transfer characteristics of motor grooves, and the temperature gradient caused by Joule heat caused by eddy current loss is larger, which changes the intensity and direction of magnetic field.
【作者单位】： 内蒙古工业大学能源与动力工程学院;风能太阳能利用技术省部共建教育部重点实验室;
【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)
【分类号】：TM315
[Abstract]:Taking the actual output current corresponding to different sharp speed ratios at rated wind speed as excitation, the finite element method (EFEM) with edge is used to solve the three-dimensional transient and harmonic magnetic field vectors directly from vector interpolation function in the grooves of the motor. To ensure the tangential continuity of the magnetic field vector at the junction of the unit, the magnetic field intensity and eddy current loss of different stator structures of 32-slot 8-pole motor, 12-pole 8-pole motor, 3-pole groove with inclined shoulder and fan groove are calculated respectively. Through the physical field file transfer load method, the electromagnetic field calculation results are regarded as indirect coupling mode of temperature field load transfer. After iterative calculation, the magnetic flux density, magnetic field intensity vector and heat flux density distribution are obtained by reading the result file. The analysis shows that EFEM has high accuracy and effectiveness in calculating the electromagnetic and heat transfer characteristics of motor grooves, and the temperature gradient caused by Joule heat caused by eddy current loss is larger, which changes the intensity and direction of magnetic field.
【作者单位】： 内蒙古工业大学能源与动力工程学院;风能太阳能利用技术省部共建教育部重点实验室;
【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)
【分类号】：TM315
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