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

Abstract

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