分数槽永磁同步电动机稳态参数的计算

针对具有场域结构对称，场分布不对称特征的工程类问题，提出新型有限元降价技术，该技术可将Ｎ阶有限元方法降价为２个具有相同刚度矩阵的０．５Ｎ阶有限元方程大大节省了计算机内丰空间和ＣＰＵ时间，为了提高计算的准确性，采用负载法计算稳态参数，该方法不仅考虑了实际工上磁性材料的饱和情况同时也考虑了ｄ，ｑ轴之间磁场的相互作用，文章还处理非线性收敛问题以及嵌套迭代收敛问题，收敛速度明显提高，最后给出了应用实例及计

THE STEADY STATE PARAMETERS CALCULATION OF A PM MOTOR WITH FRACTIONAL SLOTS

The paper presents a new ranks reduction approach of FEM for the problem with symmetrical geometry and asymmetrical field distribution. By this approach, N ranks FE equation can be transformed into two FE equations with about 0 5N ranks. Therefore, both storage capacity and CPU time may be saved significantly. The steady state parameters are calculated by loading method, which takes the magnetic saturation and the interaction of d and q axes magnetic fields into consideration. The convergence problem caused by nonlinear and overlap iteration has been treated,which leads to the convergence rate to increase obviously. Finally,a calculation example is given. There exists a close agreement between the numerical calculations and experimental results.