基于精确磁路的新型混合型轴向-径向磁悬浮轴承研究

Research of New Hybrid Axial-Radial Magnetic Bearing Based on Accurate Magnetic Circuit

该文基于一种实心同极性轴向-径向磁悬浮轴承结构,其具有磁场分布均匀、轴向空间较小的优点。针对该新型混合型轴向-径向磁悬浮轴承结构紧凑、磁场分布复杂等特点,结合有限元二维仿真结果,建立考虑漏磁的精确磁路模型。根据磁路模型,计算该结构的气隙磁通密度、刚度和承载力,并与有限元仿真进行对比,仿真与计算结果基本一致。实验结果表明转子能够在较高转速下实现稳定悬浮,验证了该结构的可行性。

This paper proposes a structure of solid homo-polar axial-radial magnetic bearing,which has the advantages of uniform magnetic field distribution and small axial space.Considering the characteristics of this new hybrid axial-radial magnetic bearing,such as compact structure and complex magnetic field distribution,an accurate magnetic circuit model considering magnetic flux leakage was established combined with the two-dimensional finite element simulation results.According to the magnetic circuit model,the magnetic density in air,stiffness and bearing capacity of the structure were calculated.The simulation results are basically consistent with the calculation results.It is shown that the rotor can achieve stable suspension at high speed,which verifies the feasibility of the structure.