Research on Influence of Annular Magnetic Pole on Airgap Magnetic Field and Bearing Capacity of Axial Magnetic Bearing

In order to enhance the radial bearing capacity of the axial magnetic bearing, the magnetic field distribution of the air gap in the double-annular magnetic axial magnetic bearing and the three-annular magnetic axial magnetic bearing is simulated and studied, and the dual-ring magnetic pole shaft is established. Based on the magnetic circuit model of the magnetic bearing and the three-ring magnetic pole magnetic bearing, the effect of the annular magnetic pole on the air gap permeability and the total magnetic flux of the magnetic circuit was analyzed. The spatial distribution of air gap magnetic field between magnetic poles was obtained by finite element simulation. The distributions of axial and radial components of the air gap magnetic induction intensity were analyzed. Compared with the traditional single annular magnetic pole axial magnetic bearing structure, the multi-annular magnetic pole structure was enhanced. With the edge effect of the air gap flux, the proportion of the edge flux increases, and the axial flux ratio decreases. After that, the axial component of the magnetic induction intensity and the radial component of the radial displacement of the two-ring magnetic structure and the three-ring magnetic structure are compared and analyzed. The results show that the annular magnetic pole reduces the axial force and enhances the radial force, that is, the radial bearing capacity increases, and the axial component of the magnetic induction intensity of the three-ring magnetic structure is larger than that of the double-ring magnetic structure. The radial component of the displacement to the displacement is reduced, which provides a theoretical and experimental reference for the radial suspension of the annular magnetic axial magnetic bearing.