Due to the external disturbances or the time-variable load, it is necessary to study the dynamic levitation behavior in order to guarantee the stable levitation of superconducting magnetic bearing (SMB). This paper investigates the dynamic levitation behaviors of a radial-type SMB under axial load condition. By adopting the Power-law E-J relation, the simplified H-formulation finite element model of a radial-type SMB was established to calculate the axial dynamic levitation behavior with the aid of the PDE module and ODE module in software COMSOL. The experimental measurements of the axial levitation force were performed in the field cooling condition so as to validate the model. Then, the dynamic levitation behaviors of the radial-type SMB were discussed when the PM rotor suffers from the external disturbances including the axial constant load with different initial velocities and the sinusoidal time-variable loads. The results show that both the load size and the initial velocity drift the work point of PM rotor. And the sinusoidal load leads to a complex time-evolution of the levitation behavior. The study is useful to predict the effects of external disturbances on the dynamic levitation behaviors in the practical applications of the SMB.

由于外部干扰或随时间变化的负载，有必要研究动态悬浮行为以确保超导磁性轴承（SMB）的稳定悬浮。本文研究了径向型SMB在轴向载荷条件下的动态悬浮行为。通过采用幂律E - J关系，简化了H利用COMSOL软件中的PDE模块和ODE模块，建立了径向型SMB的有限元模型，以计算轴向动态悬浮行为。在田间冷却条件下进行了轴向悬浮力的实验测量，以验证该模型。然后，讨论了当永磁转子受到外部扰动（包括具有不同初始速度的轴向恒定负载和正弦时变负载）的外部干扰时，径向型SMB的动态悬浮行为。结果表明，负载大小和初始速度都会使永磁转子的工作点发生偏移。正弦载荷导致悬浮行为的复杂时间演化。