Đánh giá hoạt động của ổ từ kiểu lai có khe hở phụ và đề xuất phương án cải tiến

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 other of using the auxiliary clearance.