Modeling and Analysis of a Proposed AC-DC C-Core Heteropolar Radial Hybrid Magnetic Bearing

In this study, a new C-Core heteropolar radial hybrid magnetic bearing (HRHMB) driven by a three-phase power inverter is proposed. The use of a three-phase inverter driving technology improves the performance of magnetic bearings in terms of cost and power consumption. The force-current and the force-displacement characteristics of the proposed HRHMB are linear and the magnetic field coupling between the X and Y directions is significantly reduced. To analyze the proposed HRHMB, the configuration, working principle and required mathematical model based on the equivalent magnetic circuit (EMC) method are firstly presented. Then the load capacity and important parameters design are deduced. A comparison between the results obtained by the used analytical approach and those given by the finite element method (FEM) allowed verification of the developed mathematical model’s accuracy. Compared with the twelve-pole HRHMB, the proposed HRHMB improves bearing capacity, reduces mass, and enhances cost efficiency and performance, making it highly suitable for large journal diameter applications.