Suspension Force Model of Bearingless Multi-Sector Surface-Mounted Permanent Magnet Synchronous Motor Based on Maxwell Stress Tensor Method

Considering motor load and eccentricity, the time-domain model of suspension force of a bearingless multisector permanent magnet synchronous motor is obtained. The model is suitable for the bearingless motor with multi-sector winding connections and can be used to calculate the magnitude and direction of the suspension force vector on the rotor of the bearingless motor in real time. Finally, Ansys Maxwell simulation results are compared with the calculated results to verify the correctness of the time-domain model. Furthermore, based on the time-domain model, the decoupling control strategy of the bearingless motor is proposed.