Simulation Study on Electromagnetic Environment of Suspension Magnetostatic Field of EMS Maglev Train

In order to quantitatively evaluate the electromagnetic environmental risk of the regularly conducting electromagnetic suspension (EMS) maglev trains, based on determining the rotor excitation coils of the linear motors located on both sides of the suspension frame of the maglev train as the radiation sources, the three-dimensional structural models of long stator track and EMS maglev train are established by using finite element software COMSOL Multiphysics. Simulation calculation is conducted to study the suspension electromagnetic characteristics of linear motor and the magnetostatic field generated by the linear motor in its surrounding space and maglev train compartments; and then the calculation results of magnetic flux density in the compartments are compared with the limit standards of magnetostatic field exposure. The results show that when the excitation current of the long stator linear motor is 25 A, the maximum modulus of the magnetic flux density at the center line of the suspension gap is approximately 0. 9 T, and the suspension electromagnetic force is approximately 19. 7 kN · m-1; the maximum modulus of the magnetic flux density at the interlayer of the maglev train is between the range of 9. 39-53. 6 uT, and that inside the train compartments is approximately 6. 93 uT. The maximum magnetic flux density generated by the suspension excitation coils in the train compartments is far lower than the 400 mT static magnetic exposure limit recommended by the International Commission for Non-Ionizing Radiation Protection (ICNIRP) for the general public; and it meets the static magnetic exposure control limit of less than 1 mT in Standards EN 45502-2-1—2003 and GB 16174. 2—2015. © 2023 Chinese Academy of Railway Sciences. All rights reserved.