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为满足航天用扁平转子磁悬浮飞轮对低功耗磁轴承的需求,提出一类同极性嵌环式永磁偏置径向磁轴承(Radial permanent-magnet-biased magnetic bearing,RPMB),旋转损耗低,工作气隙径向内外双环、轴向同层分布,径向磁力为平面汇交力系,具有磁极轴向短、可灵活设计的独特优势。根据全主动、主被动两类磁悬浮飞轮的不同需求,采用磁路分析与有限元仿真的方法,对磁极对齐型、磁极交错型、磁极偏置型三种嵌环式RPMB进行了有针对性的分析与设计,所设计的全主动磁悬浮飞轮,具有轴向长度短、质量小、精度高的优点;所设计的两轴主动磁悬浮飞轮,经优化设计,具有高被动刚度、高电流刚度、电流刚度高稳定性的优点。
In order to meet the demand of low power magnetic bearing for the flat rotor magnetic flywheel used in aerospace, a radial permanent magnet with biased magnetic bearing (RPMB) The working air gap is radially inward and outward with double rings and is distributed in the same layer in the axial direction. The radial magnetic force is a planar cross-power system. It has the unique advantages of a short axial magnetic pole and flexible design. According to the different requirements of all active and active and passive magnetic levitation flywheel, the magnetic circuit analysis and finite element simulation methods were used to analyze the three types of RPMB, such as pole-aligned type, pole-staggered type and pole-offset type Analysis and design, the designed all-active magnetic suspension flywheel has the advantages of short axial length, small mass and high precision. The designed two-shaft active magnetic flywheel has the advantages of high passive stiffness, high current rigidity, The advantages of high stability.