常导高速磁悬浮列车电磁场的分析与测量

Electromagnetic Field Analysis and Measurement of the High Speed Normal Magnetic Levitation Vehicle System

常导高速磁悬浮列车采用长定子直线同步电机驱动,依靠电磁场进行悬浮和推进。由于定子齿槽和材料不连续性的影响,其电磁场的分布情况很难通过解析的方式进行精确的描述。采用有限元方法对列车内的悬浮磁场和推进磁场进行了系统的研究,得到了气隙内的磁场分布,计算出了悬浮力和推进力,并发现了6倍频的波动。最后,采用霍尔传感器对气隙磁场进行了测量,验证了分析的正确性。

The research achievements of the electromagnetic fields of a high speed normal magnetic levitation vehicle experimental system are reported in this paper. The high speed normal magnetic levitation vehicle constitutes a typical long stator linear synchronous motor, the study on its levitating and propulsive electromagnetic fields is of great importance. Owing to the influence of the stator grooves and the material's discontinuousness, the magnetic field distribution is very complex to be analyzed in analytical forms. The levitation magnetic field as well as the propulsive magnetic field is studied in this paper and the magnetic fields in the air gap are determined using the finite element method. The levitation force and thrust produced by the levitation magnetic field and the propulsive magnetic field are calculated, they are found to vary following the change of the air gap and exciting currents. At the end of this paper, a magnetic field strength measurement system based on the hall sensor is designed and the experimental result is compared with the result derived from magnetic field analysis.