Abstract
The three-degrees-of-freedom hybrid magnetic bearing (3-DOF HMB) is widely used in high-speed motors because of its compact size and small axial space. For high-speed applications, only a solid rotor structure can be used. However, solid materials may have problems such as eddy current effects. To design high-performance 3-DOF HMB, the dynamic characteristics of the 3-DOF HMB are first analyzed, and an accurate dynamic magnetic circuit model considering eddy currents and leakage fluxes is established. Secondly, an optimization method with minimum axial length and volume is proposed based on the model. Finally, the results of the optimization design meet the design requirements, and the accuracy of the optimization results is proved by finite element simulation.
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