[AP8] Magnet science and technology 2

3:01 PM - 3:16 PM JST(6:01 AM - 6:16 AM UTC)

[AP8-02] Electromagnetic and dynamic characteristics of HTS maglev systems under rotating magnetic fields

*Can Peng¹, Bin He², Yicheng Feng², Peiyu Yin², Zigang Deng² (1. School of Information Science and Technology, Southwest Jiaotong University (China), 2. State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University (China))

Keywords:

HTS maglev,magnetic feld rotation,electromagnetic force,dynamic characteristics

This study explores the electromagnetic coupling dynamics of high-temperature superconducting (HTS) maglev systems subjected to rotating magnetic fields, using a combination of quasi-static and dynamic experimental characterizations along with numerical modeling. Two experimental protocols are designed: (1) quasi-static force measurements under constrained HTS bulk rotation to quantify electromagnetic force and torque components; (2) dynamic response measurements of yaw angular displacement during free vibration to extract rotational damping and natural frequencies. An H-formulation-based finite element model is proposed to simulate the coupled translational and rotational magnetic field effects. Both simulations and experiments reveal that rotating magnetic fields introduce strong nonlinearities in electromagnetic force, stiffness, damping, and natural frequency. In the quasi-static tests, the levitation force, guidance force, and yaw torque exhibit notable nonlinear behavior under rotation. Different bulk array configurations are tested, which included single, double, and four bulks. For the single-bulk configuration, levitation force decreases with increasing rotation angle but rises sharply with lateral displacement, while both parameters amplify guidance force and yaw torque. In contrast, for the double-bulk configuration and four-bulk configuration, rotation and lateral displacement jointly enhance all three force components. In dynamic tests, releasing the yaw rotational degree of freedom leads the HTS maglev system to gradually drift from its initial equilibrium under increasing rotational excitation. This drift is accompanied by a decrease in natural frequency and an increase in rotational damping. The interplay of rotating fields and lateral displacements introduces nonlinear electromagnetic forces and damping, significantly impacting system behavior. These findings lay a theoretical and experimental foundation for studying the HTS maglev system under rotating magnetic fields and support the evaluation of full-vehicle stability, as well as vibration responses under rotational excitation.