Study Of The Mechanical Properties Of High Speed Heavy Load Superconducting Magnetic Levitation Bearings

High-temperature superconducting magnetic levitation bearings operate at high speed without active control,allowing for both high load ratios and ultra-high speed operation.This paper is oriented to engineering practice,the axial and radial superconducting bearings are studied,and the loss of the superconducting system are studied experiment and simulation.In this paper,the numerical modeling of superconducting bulk is carried out in COMSOL software using the H-formulation,and a finite element model is used to establish the outfield model.For axial-type superconducting bearings,the optimal size of permanent magnets exists,and the influence of relaxation,preload and radial offset on the levitation force is investigated,and in the presence of an inclination angle between the rotor and the stator,it is found that the orthogonal inclination angle decreases the levitation force more than the parallel inclination angle when moving radial.For radial superconducting bearings,the relaxation and preload characteristics of radial superconducting bearings at different temperatures were studied,the inclination of the superconducting stator was studied,the tapered structure was found to improve the bearing stiffness,two-dimensional axisymmetric and three-dimensional bearing models were established,a set of high-speed and heavy-load radial superconducting bearings were designed and assembled and experiments were carried out.For the dynamic loss of the superconducting system,the loss of the bulk under the spatial vector magnetic field was simulated by introducing the temperature influence function,and a high-speed test platform was built,and it was found that the greater the magnetic field gradient,the greater the bulk loss,the more unfavorable the operation of the superconducting magnetic levitation system.The above-mentioned experimental study on radial superconducting bearings has verified the scientific basis and feasibility of numerical simulation calculations,which can reduce the cost and development time of superconducting bearing design optimization,and is of reference value to the engineering application of superconducting bearings.