Analysis of the influence of axial mass eccentricity on polar axis offset characteristics in superconducting rotors of magnetic levitation system

The superconducting rotor magnetic levitation system has great potential in high-precision angular velocity sensing, but its accuracy and stability are limited by the coupling of multiple physical fields. To address the unresolved synergistic interaction between axial mass eccentricity and aspheric factors, this study systematically quantifies how material heterogeneity affects axial mass eccentricity. On this basis, a multi-field coupling dynamic model of superconducting rotor is established, and the dynamic characteristics of polar axis offset under the single action of axial mass eccentricity and its synergistic effect with aspheric factors such as centrifugal deformation are deeply analyzed, and quantitatively characterizes the nonlinear increase in drift velocity arising from their coupling. The results show that axial mass eccentricity is the core interference source of polar axis drift. The proposed quantitative models of material-induced eccentricity and its coupling with deformation offer a new theoretical foundation for drift prediction, compensation control, and structural optimization of high-precision superconducting rotors.