Study On The Influence Of Magnetic Properties In Radical Magnetic Bearings Caused By The Anisotropy Of Silicon Steel

Magnetic levitation technology has become mature and magnetic bearings has been widely used.Today,people have put forward higher requirements to the magnetic levitation bearings,such as the rotation accuracy of the magnetic bearing rotor,magnetic bearing energy loss,the bearing capacity of magnetic bearings.The influence of the anisotropy of the core material on the performance of the magnetic bearing has been shown in the practical application.In this paper,based on the anisotropy of ferromagnetic materials,the influence of electromagnetic properties of radial magnetic bearings is analyzed in detail and the radial magnetic bearing structure is optimized.First of all,based on the finite element analysis theory of electromagnetic field,the Maxwell equations of magnetic bearing,the boundary conditions and the general steps of solving the finite element of radial magnetic bearing are given,which lays the foundation for the electromagnetic field analysis of magnetic bearing.Secondly,the anisotropy of ferromagnetic materials is briefly introduced,and the finite element analysis method of anisotropy of ferromagnetic materials is given.In order to verify the anisotropy of silicon steel sheet,the magnetization curve and loss curve of different directions of the silicon steel were measured and compared.In order to further study the effect of ferromagnetic material anisotropy on radial magnetic bearings,based on the anisotropy of silicon steel sheet,Maxwell software is used to establish and analyze the models of radial magnetic bearing laminated of silicon steel at any angle.The results show that in terms of magnetic field and magnetic force analysis,the radial magnetic bearing laminated of silicon steel sheet by rotation is much better than that laminated of silicon steel sheet on one direction,and the more careful the angle of rotation is,the better the performance optimization is.Finally,the radial magnetic bearing magnetic stators and rotors laminated of DW250 non-oriented silicon steel sheets rotated in different direction were made,and carried out a force test.The test results show that in the same structure parameters,the angle of the laminated silicon steel rotation is more detailed,the bearing capacity of radial magnetic bearings is greater.The maximum radial bearing capacity of the radial magnetic bearings laminated of silicon steel rotated by 10°is 8.4% larger than the radial magnetic bearing laminated of silicon steel in the form of non-rotation and the result of simulation is 9.3%.