Abstract：The power system of the superconducting electrodynamic suspension maglev train adopts a longstator linear synchronous motor. Its operational stability is susceptible to disturbances such as uneven tracks，curve passage，and crosswinds，which result in alterations to the train's attitude. The air gap between the superconducting magnet and the propulsion coils fluctuates，thereby altering the electromagnetic force characteristics. To explore the mechanism of the effect of air gap variation on traction performance，firstly，a mathematical model of the superconducting linear synchronous motor was established based on the space harmonic method and verified the accuracy of the model through finite element analysis. Furthermore，the dynamic response characteristics of the motor air gap magnetic field and traction force under multi-degree-of-freedom disturbances，including vertical，lateral，pitch，roll，and yaw conditions were systematically analyzed，the correlation between air gap variations and traction force fluctuations was revealed. The findings provide a theoretical foundation for developing active control strategies and optimizing dynamic stability in the superconducting electrodynamic suspension maglev train.

        Key words：electrodynamic suspension（EDS）；linear synchronous motor；space harmonic method；finite

element method；superconducting magnets

     Format Citation:王津，葛琼璇，赵鲁. 超导电动磁浮列车用长定子直线同步电机电磁性能分析[J].电气传动,2026,56(07):3-9,38. WANG Jin，GE Qiongxuan，ZHAO Lu. Electromagnetic performance analysis of long-stator linear synchronous motors for superconducting electrodynamic suspension maglev trains [J].Electric Drive, 2026,56(07):3-9,38