基于电磁场形态调整的涡流制动效能分析

针对磁悬浮列车线性涡流制动装置制动力不足的问题,对励磁电流和气隙等参数以及磁轭厚度、铁芯宽度和极距等结构参数进行分析。基于电磁场形态分析,采用脉冲电流作为激励形式,增大磁场作用范围,从而有效提高制动力。结果表明,在一定范围内,增加脉冲幅值能有效提高制动力,随着脉冲高电平幅值的增加,制动力明显减小;脉冲频率对制动力的影响较小;占空比越高,制动力越大。

Efficiency Analysis of Eddy Current Braking Based on Electromagnetic Field Shape Adjustment

In order to handle the problem of insufficient braking force produced by the maglev linear eddy current braking device, we corrected specific parameters in electromagnetic field, such as the exciting current, air gap, yoke thickness, core width and polar pitch. The pulse-current was used as the exciting form to increase magnetic field intensity, which can keep a high-speed field shape. By analyzing the deformation of the moving electromagnetic field, the braking force of the braking device is effectively improved. The results show that within a certain range, increasing the pulse amplitude can effectively improve the braking force. On the other hand, as the amplitude of the high pulse level increases, the braking force will greatly decrease. Besides, the pulse frequency has a relatively small impact on braking force. Meanwhile, the higher duty-cycle of pulse can also be used to generate greater braking force.