A novel structure for radial hybrid magnetic bearing based on flux extrusion effect

This paper introduces a new type of magnetic bearing structure based on flux extrusion effect. The structure consists of a square stator, a circular rotor, permanent magnets and exciting coils. By generating permanent magnet flux on the four sides of the square stator and electromagnetic flux at the four corners, and forming mixed flux in the sections of maximum area, the restriction of the structure size on the magnetic pole area is broken through, so as to reduce the maximum power consumption of the magnetic bearing and effectively improve the bearing capacity of the magnetic bearing. On this basis, the formulas of electromagnetic force, current stiffness and displacement stiffness are established according to the equivalent magnetic circuit method. The effectiveness of the formulas is verified by the FEA analysis.