Levitation electromagnet which located on the head of a medium-low speed maglev vehicle can cause significant eddy currents in rail when it is running. The eddy current which increases with speed increasing not only affects the levitation force of the levitation electromagnet

but also affects detection output signal of levitation gap sensors based on the principle of eddy current. Aiming at the influence of eddy current on the levitation gap sensor of the head of vehicle

the transient magnetic field simulation of single magnet module model is carried out by Maxwell 3 D and the overlapping phenomenon between the eddy current generated by the rail and the eddy current generated by the excitation of the coil is analyzed. It is concluded that the influence of the eddy current is easy to lead to the larger measured value of the sensor. The experimental results also confirm the above conclusions.