Abstract: Aiming at the problem of insufficient adhesion during train braking, based on the wheel structure and the basic principle of electromagnetism, a scheme of electromagnetic ring coil fixed on bogie is proposed. The scheme uses electromagnetic coil to magnetize the wheel, generating vertical attraction on the track to increase axle load. Embedded ring coil excitation model and external ring coil excitation model are set in the mentioned scheme, and parameters of the two models such as electromagnetic flux density and vertical electromagnetic adhesion are analyzed using Ansoft Maxwell electromagnetic field analysis software. Calculation results show that in the embedded ring coil excitation model, the pressurization effect on wheel-rail is not obvious, as well as the adjustment effect of axle load increase; while in the external ring coil model, more stable excitation has been produced on wheel-rail contact position, and the wheel-rail can obtain larger vertical electromagnetic attraction, demonstrating evident pressurization effect on the wheel.