Design and Analysis of Axial Hybrid Magnetic Bearing with Asymmetric Axial Air Gaps

摘要

A novel hybrid magnetic bearing (HMB) with asymmetric axial air gaps is proposed. The magnetic bias force between the upper and lower surfaces counteracts the rotor's gravity to keep the rotor at equilibrium position. The magnetic circuit model considering the flux leakage is established to calculate the electromagnetic parameters and optimize the main dimensions. The inductances of the control windings and the relationship between bias force and position displacement is calculated and analyzed by the finite element method (FEM). The linear expression of the net force governed by the position displacement and control current is presented. The FEM results verify the validity and correctness of the magnetic circuit model.