Design and performance analysis of a new uncoupled radial hybrid magnetic bearing

Jun  Liu; Xiaojun  Lin; Xinquan  Yin; Juanjuan  Qin

doi:10.6180/jase.202408_27(8).0012

Design and performance analysis of a new uncoupled radial hybrid magnetic bearing

Jun Liu¹, Xiaojun Lin²This email address is being protected from spambots. You need JavaScript enabled to view it., Xinquan Yin³, and Juanjuan Qin²

¹Lanzhou Institute of Technology, School of Civil Engineering, Lanzhou, Gansu, China 730050

²Lanzhou Institute of Technology, School of Mechatronics Engineering, Lanzhou, Gansu, China 730050

³Lanzhou Institute of Technology, School of Automotive Engineering, Lanzhou, Gansu, China 730050

Received: June 4, 2023
Accepted: September 23, 2023
Publication Date: November 21, 2023

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202408_27(8).0012

There is a coupling problem between the bias magnetic circuit and the control magnetic circuit of hybrid magnetic levitation bearings, which not only affects the support stiffness of the magnetic bearing, but also increases the difficulty of control and power consumption. To solve this problem, an uncoupled radial hybrid magnetic bearing (RHMB) with four stator cores in the front and rear rows is proposed, which achieves the design of independent magnetic circuit channels for bias magnetic field and control magnetic field. Subsequently, an equivalent magnetic circuit model for the new magnetic bearing was established and its electromagnetic force analytical calculation formula was derived. In order to verify the performance of the new structure and the effectiveness of the analytical model, the ANSYS Electronics Desktop software was used to simulate and analyze its three-dimensional magnetic field distribution, electromagnetic force variation patterns, and coupling characteristics. The results show that the proposed analytical model for the new structure is effective and can effectively linearize the force displacement and force current relationships, which is consistent with the calculation results of the simulation model. In addition, compared to traditional structures, the new structure has better magnetic field decoupling characteristics, which can reduce the eddy current loss of the iron core by 50.12% and the required control current from 2.3A to 1A. The research results can provide theoretical basis for the design and control of magnetic levitation bearings.

Keywords: Radial hybrid magnetic bearing; Independent magnetic circuits; Analytic calculation; Decoupling; Finite element analysis

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