三维分段分层法用于光滑实心转子异步电机参数计算与性能分析

摘要

实心转子异步电机转子中复杂的三维非线性涡流场计算是分析电机性能的基础,而采用三维有限元分析的计算量十分庞大.提出了一种三维分段分层法计算实心转子磁场,可考虑定转子铁心磁路饱和、转子端部效应的影响,且计算量小.定子铁心磁路饱和采用波幅系数以及饱和系数予以考虑.对于转子磁路饱和以及转子端部对涡流分布的影响,将实心转子沿轴向分段、径向分层,各段、各层的磁导率互不相同,每段采用分层理论递推求解磁场量.转子表面磁场强度的收敛边界由定子电流给出,依据转子柱面和两个端面进入转子的能量计算等效转子阻抗,迭代求解转子磁场及阻抗参数,直至收敛.在不同工况下比较了三维分段分层法的计算结果与样机实验结果,两者较为吻合.可以采用这种算法计算光滑实心转子电机参数并分析性能,为设计优化电机提供依据.%When the nonlinearity of solid rotor was taken into account,the magnetic field and eddy current calculation in solid rotor cost large amount of computation with 3D finite element method.This paper puts forward a 3D subsectional and multi-layer method.Amplitude coefficient and saturated coefficient are applied to consider the saturation in stator core.Permeability of each subsection and layer is different,so that the effect of saturation in rotor core can be considered.While calculating the rotor equivalent impedance,both the energy penetrating from the cylindrical and two end surfaces into the rotor are considered.Therefore, the effect of axial finite length of rotor towards magnetic field is also taken into account.The calculation results using the mentioned 3D subsectional and multi-layer method agree with the experimental test results on a model machine.This indicates the method is suitable for the parameter calculation and optimal design of solid-rotor induction machine.