Study On Magnetic Levitation Force Of Non-ideal Hightemperature Superconducting Magnetic Bearings

In recent years,high temperature superconducting magnetic bearings have shown good application prospects in the fields of rotating machinery,flywheel energy storage,aerospace industry,transportation,nuclear industry and other fields because of their good non-originated stability characteristics.The design idea,structure,material and application environment have always been the focus of attention.Based on the application of high temperature superconducting magnetic levitation bearing system,this paper comprehensively explores the magnetic field distribution of the permanent magnet itself and the magnetic levitation force on the high temperature superconductor in view of the simplified model of the high temperature superconducting magnetic levitation system and when the surface of the permanent magnet contains defects,and obtains some meaningful results.First of all,using the method of combining the theory and simulation,studied the monolithic cylindrical permanent magnet containing defects and two pieces of poles and the combination of the adjacent side by side same space of the cylindrical permanent magnet magnetic field distribution,hole defects,edges and corners are analysed in detail on the geometry size and the location of the defect of permanent magnet parameters,such as threedimensional space magnetic field distribution,the influence of defect of space magnetic field of permanent magnet is given quantitatively.The results show that the permanent magnet defects mainly affect the local magnetic field variation,and the influence on the axial magnetic field component is small,and the influence on the radial magnetic field component peak value,distribution characteristics,and the location of the maximum value is significant.Secondly,according to the governing equation of H-method,the quasi-static study of the magnetic levitation force of the ideal HTS maglev system is carried out,and the reliability of the method and calculation program is verified by comparing with the experimental results.Furthermore,the influences of radius,thickness,residual flux density of single permanent magnet and horizontal distance between combined permanent magnets on the magnetic levitation force are discussed in detail,and the relationship between the maximum magnetic levitation force and the parameters of permanent magnet is given.Finally,based on the ideal of high temperature superconductors superconducting maglev system internal shielding current density and magnetic field analysis of the physical change,single block permanent magnets are given respectively-the superconductor is not an ideal and composite magnets-superconductor maglev system not ideal in the maglev system with permanent magnet magnetic levitation force surface face defects,defect of edges and the rule of variation of geometric parameters such as size and location,the results show that compared to the hole edges and defects on the magnetic levitation force influence obviously on the edge of the magnet induced defects at the bottom of the superconductor shielding current changes and internal magnetic field change was the main reason for the effect of the magnetic levitation force.Given the non-ideal defect in the HTS maglev system trace,and considering the research questions for the electromagnetic coupling problem of three dimensional space,the paper using numerical simulation method and programming language synchronization is analyzed,and compared based on experimental data,to ensure accurate access to the problem of non ideal detail variation characteristics of magnetic field and magnetic levitation force in non-ideal HTS maglev system used by numerical simulation technology is helpful to the design and application of high temperature superconducting maglev bearing used in the study.