Analytical Modeling of Bearingless Flux Switching Permanent Magnet Machines Considering Rotor Dynamic Eccentric

The analysis methods of traditional bearingless permanent magnet synchronous machines whose permanent magnets located in the rotor cannot be applied to a bearingless flux switching permanent magnet machine directly. In addition, the finite element method and the magnetic equivalent circuit are difficult to derive the explicit expressions of variables. Moreover, those methods are sensitive to machine parameters, require a large amount of computation time, and are sophisticated in model construction or reconstruction. Hence, an analytical method based on equivalent smoothed stator and rotor and single-salient permeance are proposed in this paper to deduce the explicit expressions of some key electromagnetic quantities of proposed BFSPMM, and then construct the mathematical models of suspension force with rotor eccentric and torque. Finally, the finite element simulation and experiment are carried out, and the correction of the proposed mathematical models of the BFSPMM is verified by the results.