Review of Unbalanced Magnetic Pull Analysis Models for Bearingless Permanent Magnet Slice Motors

Bearingless permanent magnet lamella motors have become one of the research hotspots in the field of motors in recent years because of their lack of mechanical wear. The suspension accuracy of the rotor is one of the most important performance indicators of the bearingless slice motor, and the unbalanced magnetic pull greatly affects the suspension performance of the rotor. In order to improve the precision and stability of bearingless slice motors, it is crucial to understand and accurately compensate for the unbalanced magnetic pulling force. Therefore, studying the precise mathematical model of this force is essential to achieving high-quality levitation in these motors. To this end, for the unbalanced magnetic pull analysis model of the bearingless slice motor, this article summarizes and classifies existing analysis models from aspects such as modeling methods, modeling principles, modeling difficulty, and derivation processes, explain the analysis methods of various models and the advantages and disadvantages of the models. Finally, the analysis model of unbalanced magnetic pull is summarized and prospected.