Numerical Analysis of the Rotational Magnetic Springs for EDS Maglev Train

Different from the traditional railway trains, the combined levitation and guidance EDS maglev train is more likely to rotate after being disturbed. Therefore, the rotational electromagnetic stiffnesses are significant operating parameters for the train. In this paper, the different effects of each translational offset generated in the rotational motion on the corresponding rotational electromagnetic stiffnesses in the EDS maglev train are analyzed and calculated. Firstly, a three-dimensional model of the maglev train is established. Then, based on the space harmonic method and the equivalent circuit of the levitation and guidance circuits, the formulas of rolling, pitching and yawing stiffness are presented. Finally, by comparing with the three-dimensional finite element simulation results, the key translational displacements in the rotational motion which has a great impact on the stiffness are obtained. Hence, the three-dimensional analytical formula can be simplified and the computation can be reduced. In addition, the accuracy of the calculation results is verified by comparing with the experimental data of Yamanashi test line.