Finite Element Analysis of Fault Tolerance Method for Eight-pole Hybrid Magnetic Bearing

The structure of the magnetic bearing system is complex, and the damage of the magnetic bearing winding will lead to the failure of the whole magnetic bearing system. In order to study the operation of the eight-pole magnetic bearing winding under fault, this paper proposes different compensation methods for its typical fault. Through the analysis of magnetic circuit and the principle of force invariance, the relationship between the control current and the fault of one circuit or the corresponding power amplifier system is solved, and then the current compensation mode under the fault condition is obtained. MagNet 3D is used to analyze its electromagnetic characteristics. Based on the results of finite element analysis, the compensation methods of different suspension forces are optimized.