Research on the characteristics of vertical electromagnetic force in EMS maglev trains based on hysteresis effect
Year: 2025
Type: article
Abstract: The vertical component of the electromagnetic force between the electromagnet and the track is a key factor for the suspension and support of the EMS (Electromagnetic Suspension) maglev train. The hysteresis effect of the levitation electromagnet has a direct impact on the variation of the electromagnetic force. To investigate the influence of the hysteresis effect on the vertical component of the magnetic force in the EMS levitation system, a single electromagnet was first taken as the research object, and a vertical electromagnetic force model of the EMS levitation system was established based on the equivalent magnetic circuit method. A model was established by introducing changes in relative permeability considering magnetic saturation, and a model was established based on the Jiles-Atherton hysteresis theory, considering the hysteresis effect and a bench test of a single electromagnet was carried out. Secondly, a comparative analysis was conducted on the magnetic characteristics of the three vertical electromagnetic force models under static conditions, and levitation control was introduced to compare and analyze the magnetic characteristics of the three vertical electromagnetic force models under dynamic conditions. Finally, a vertical electromagnetic force model suitable for numerical calculation based on the hysteresis effect was proposed. The results show that under static conditions, within the conventional range of levitation gaps (6-12 mm) and coil currents (20-40 A), the differences among the three vertical electromagnetic force models are not significant. However, after the levitation electromagnet reaches the state of magnetic saturation, the model considering the hysteresis effect is closer to the experimental results, and the calculation results are more accurate. Under dynamic conditions, the model considering both the hysteresis effect and magnetic saturation effect will increase the overshoot of the levitation system, and there will be strong noise interference when the levitation is stable.
Authors: Liu Qinghui, Li Miao, Ma Weihua, Cao Yi, Luo Shuihui
Institution: Southwest Jiaotong University
Language: English
Subfield: Control and Systems Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4410806320