磁悬浮列车用直线电机的有限元分析和电感计算

FEM analysis and inductances calculation of linear motor in maglev trains

为研究磁悬浮列车长定子直线电机的性能,以德国TR08型磁悬浮列车长定子直线同步电机尺寸为基础,基于有限元方法建立了一个悬浮电磁铁模块的分析模型,对其牵引和悬浮电磁场进行了较为系统的分析,得到了不同动子极距下牵引和悬浮力的变化曲线.重点研究了长定子直线同步电机在分别改变定、动子电流和气隙大小的情况下,以及定动子绕组交直轴电感的变化情况,并通过多项式拟合和傅立叶分解得到了交直轴电感的经验公式.仿真结果表明,定子电流对气隙磁场和电感影响较小,当动子极距为266.5 mm时电机性能较佳,拟合得到的经验公式具有较高的精确度,平均误差小于5%.

A model of one electromagnet module based on the dimensions of long stator linear motor in Germany TR08 maglev was established to study the performance of long stator linear motor in maglev trains. The levitating and propulsive electromagnetic fields were analyzed by finite element method （FEM）. Then the levitating and propulsive forces were obtained under different pole spans. And the d-q axial inductances were highlighted along with the long stator motor＇s currents and the air gap length. Multinomial fitting and Fourier decomposition method were used to derive the empirical formulas. It was found that the influence of stator current on the air gap magnetic field was very small, and that the motor performance was better on condition that the rotor pole span was 266.5 mm. Simulation results proved that the proposed empirical formulas are accurate and that the average errors are less than 5 %.