中文摘要：

南极天文望远镜所处的超低温环境决定了传统接触式机械轴承的性能受到严重影响,而磁悬浮轴承由于具有低功耗、无机械接触摩擦等优点非常适合这种环境。为了方便维护及降低建造成本,永磁支承采用拼接永磁结构。文中首先对无聚磁极结构的永磁支承进行仿真,然后在对聚磁材料的宽度进行优化后,对有聚磁极结构的永磁支承进行仿真计算。最后得出结论：引入聚磁极结构将实现永磁支承承载性和稳定性的提升,可促进永磁轴承轻量化的发展。

英文摘要：

The properties of traditional contact mechanical bearing are seriously limited in ultra-low temperature environment at the South Pole. The magnetic bearing which has the advantages of low power consumption and no mechanical contact friction is suitable for working in this environment. Considering convenience of maintenance and lowrost, a structure of segment permanent magnet is designed. First, the magnetic bearing witbout the structure of magnetism concentration is simulated in this article. Then the design of magnetism concentration width is optimized, and the magnetic bearing with the structure of magnetism concentration is simulated. Finally the conclusions are as follows： the bearing capacity and stability of magnetic bearing are improved with the structure of magnetism concentration ; the development of the lightweight of permanent magnetic bearing will be promoted.