Speaker
Description
Wenjiao Yang, and Guangtong Ma*
With the merits of passive stability, energy-saved and environment-friendly, high-temperature superconductor (HTS) magnetic levitation (Maglev) is regarded as a promising candidate for the future high speed transit. Limited by the experimental conditions, numerical methods are generally employed in most of the current research on dynamic charactristics of high speed HTS Maglev. However, the governing equation of H-formulation is always employed with the fact that motional electromotive force will make a grateful difference on HTS electromagnetic property during high speed operation ignored. Thus the ultimate goal of this paper is to build a numerical model to advance the understanding of the dynamic charactristics of HTS Maglev system for the potencial high-speed Maglev vehicle applications, such as that of over 1000 km/h, with velocity-related motional electromotive force taken into consideration.
The derivation of H-formulation including motional electromotive force is finished and numerically implemented in finite element method software COMSOL in this paper. In addition, in order to reveal the influence of motional electromotive force on performance of HTS Maglev system at high speed, the dynamic responses of HTS Maglev system under identical external excitations are calculted by models with and without motional electromotive force. The impacts of it on current distribution, magnetic field distribution, temperature distribution, vibrational displacement and electromagneticn forces are deeply explored based on the calculted results. The results from two methods underlines the necessity of the consideration on displacement current in high speed range and will play a positive role to suggest the viable measures for improving the stability of the HTS Maglev system.
Key words: HTS magnetic levitation; H-formulation; motional electromotive force; dynamic response
