Numerical Simulation On Interaction Of Superconductive Flux-pinned Connection

Because the magnetic flux pinning interaction between TypeⅡhigh-temperature superconductors and permanent magnets, there will exist flux-pinned force between them. This force is similar to restoring force, so it could enable the superconductive flux-pinned pair to achieve self-stabilization. This force is not limited by Earnshaw's Theorem, and could achieve passive stability. The magnetic flux pinning interaction's application is focused on the ground environment in recent years, but this interaction is ideal for on-orbit assembly of spacecraft. So this interaction have broad applied prospects and great research value.Though the flux frozen-image model could explain the magnetic flux pinning interaction very well, it still have many limitations in the process of numerical analysis. Based on the Maxwell's equations and the magnetic vector potential, this paper established the differential equation of the superconductive flux-pinned pair. Using the finite element simulation software COMSOL Multiphysics, this paper simulated the magnetic field distribution of permanent magnets and the magnetic flux pinning interaction between cylindrical permanent magnet and cylindrical superconductor. This paper also simulated the distribution of magnetic field on the superconductive flux-pinned pair and the shielding current within the superconductor when its in superconductive state. The pinned force-displacement curve of the simulation and experiment indicated that the two results are consistent.Factors that affect the flux-pinned force of the superconductive flux-pinned pair include superconductors'flux-pinned ability and critical current density, permanent magnetic'surface magnetic field intensity, field-cooling height, axial clearance of flux-pinned pair, and the size of permanent magnet and superconductor. This paper analyzed the vertical and horizontal pinned force-displacement curve under different conditions; Obtained the law that these factors influence on the vertical and horizontal pinned force and corresponding rigidity; Proved that the flux-pinned force have the restoring force characteristics. Discussed the rigidity and stability of the superconductive flux-pinned pair; Analyzed the time response and anti-jamming capability of the spacecraft's on-orbit docking when the magnetic flux pinning interaction was used in this course; Proved the applicability of the magnetic flux pinning interaction when its used in the spacecraft's on-orbit assembly.