屏蔽感应电机等效电路参数的有限元计算法

Parameters Calculation of Canned Solid-Rotor Induction Motor by Finite Element Analysis

提出了一种从有限元电磁场分析结果中准确提取屏蔽电机等效电路参数的方法。基于对2-D时谐电磁场的分析,利用傅里叶变换分析得到气隙磁通密度基波幅值并得出感应电动势的精确值。利用冻结磁导率法来计及不同转差率下的铁心饱和情况,推导出了转子外表面的坡印亭矢量表达式并据此得出传到转子侧的复功率,进而得到转子侧等效电路参数。然后,根据一台屏蔽感应电机建立有限元分析模型,将上述方法应用于该电机从而得到其等效电路参数。最后,将等效电路得到的结果与有限元分析及实验结果进行对比,验证了上述方法的准确性。

This paper presents an accurate calculation method to extract parameters of cannedsolid-rotor induction motor from finite element analysis of electromagnetic field. The 2-Dtime-harmonic application is used in the accurate simulation. The Fourier analysis method is applied toobtain the basic wave of air-gap flux density, and the then electromotive force is further calculate. Thefrozen permeability method is also used to take the iron saturation into consideration in wholeoperating range. The Poynting-vector in the edge of rotor region is derived to get the value of complexpower flowing into the rotor side, and the equivalent parameters of rotor can be further determined.Finally, the proposed approach is verified by both numerical and experimental solutions.