径向高温超导磁悬浮轴承的悬浮性能分析

摘要

通过对杨氏模型和 Hull John R 模型进行改进，使其既适用于径向超导磁悬浮又适用于轴向超导磁悬浮，改进模型既考虑了磁滞特性，又引入了超导体与永磁体之间有倾角的情况。利用改进的磁通冻结镜像模型对径向超导磁悬浮轴承的悬浮力及刚度进行了理论计算，结果表明：磁悬浮力随着初始径向间隙、径向偏移和轴向位移的变化而变化，且与这三者并不成单调的正比或反比关系；在所研究的位移范围内，刚度为正值且随位移变化而变化；由于磁滞效应的影响，永磁转子作往复运动时在同一点受到的力会衰减。%A new model is built by improving Young′s model and John R.Hull model,which is suitable for both radial and axial superconducting magnetic suspension.The hysteresis characteristic and the inclination angel between super-conductor and permanent magnet are considered.The theoretical calculations of suspension forces and stiffness of radial superconducting magnetic bearings are done by using improved magnetic -flux frozen -image model.The results show that the magnetically suspension forces change with the initial radial clearance,radial displacement and axial displace-ment.The relation between magnetically suspension forces and three parameters mentioned above is neither inverse nor proportional.The stiffness of bearings is positive and proportional to displacements.Due to the affection of hysteresis, the magnetically suspension forces will attenuate when the permanent magnet is reciprocating.