Performance evaluation and improvement of hybrid magnetic bearings with auxiliary clearance

Abstract

Recently, Hybrid Magnetic Bearings (HBMs) are being widely used in many devices because they have advantages of both active and passive
magnetic bearings. However, the way to combine effectively between permanent magnets and electromagnets always attracts many scientists.
This paper focuses on the performance of a four-pole hybrid magnetic bearing with auxiliary clearance and suggests a new innovative way
of using the magnetic gap. To evaluate the performance of these types of magnetic bearings, finite element analysis method (FEM) using
ANSYS was applied. In addition, the simulation results are also compared with the calculated results by the equivalent magnetic circuit
method (EMCM) to verify and give ideas to optimize the HMB. The evaluated results show outstanding advantages of the HBM using the
magnetic gap compared to the use of auxiliary clearance.