Levitation Force Analysis of Bearingless Motor Based on Coordinate Transformation

Accurate radial levitation force modeling is crucial as the theoretical basis for the design of bearingless motor driving schemes. A radial levitation force modeling scheme for bearingless motor based on coordinate transformation is proposed in this paper. The derivation of the radial levitation force is under the newly defined rotor coordinate system, which not only simplifies the model of radial levitation force but also clarifies the physical concept. Sufficient finite element simulation analysis is given to verify the accuracy of the proposed radial levitation force modeling scheme.