Quadratic Approximation Method for the Limit Value of Magnetic Stiffness in a High Temperature Superconducting Levitation System

2020 ◽  
Vol 30 (4) ◽  
pp. 1-5
Author(s):  
Xianfeng Zhao ◽  
Ziyang Sun ◽  
Yuan Liu ◽  
Luquan Yang
Keyword(s):  
High Temperature ◽  
Approximation Method ◽  
Quadratic Approximation ◽  
High Temperature Superconducting ◽  
Magnetic Stiffness ◽  
Limit Value ◽  
Levitation System ◽  
Superconducting Levitation

Influence of the physical parameters on the limits of magnetic stiffness of high-Tc superconducting levitation systems

2020 ◽  
Vol 64 (1-4) ◽  
pp. 221-227
Author(s):  
Xianfeng Zhao ◽  
Zhiqi Zhou ◽  
Yuan Liu ◽  
Luquan Yang
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Applied Magnetic Field ◽  
Physical Parameters ◽  
High Temperature Superconducting ◽  
Magnetic Stiffness ◽  
Superconducting Levitation

Magnetic stiffness is one of the important stability parameters of high temperature superconducting levitation systems. Till to now, great efforts have been made to understand levitation properties including flux penetration, magnetization curves, levitation force, ac susceptibilities, etc. In this paper we present a quadratic approximation method for the limit of magnetic stiffness in a high temperature superconducting levitation system based on Kim’s critical state model and Ampère law. The system is composed with a cylindrical permanent magnet (PM) and a coaxial high temperature superconductor (HTS). It is found that the limit of magnetic stiffness depends upon both the penetration history of shielding currents distribution in HTS and applied magnetic field gradients. Furthermore, the influence of the physical parameters, such as critical current density in HTS and applied magnetic field, on the limits of magnetic stiffness is investigated in detail. The obtained results display that magnetic stiffness decreases with the increasing of critical current density, since shielding currents have not penetrated into the large portion of the HTS. With the increase of applied magnetic field, the magnetic stiffness obtain a larger magnification factor. It is related to the increase of the shielding current penetration volume and the internal magnetic field in HTS.

High temperature superconducting levitation flywheel system and its control

2007 ◽  
Vol 181 (1-3) ◽  
pp. 12-17 ◽  
Author(s):  
Kosuke Nagaya ◽  
Masato Saito ◽  
Kazuya Kobayashi ◽  
Yoshinori Ando
Keyword(s):  
High Temperature ◽  
High Temperature Superconducting ◽  
Superconducting Levitation
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