Eddy Current Loss Reduction and Thermal Analysis of Ultrahigh-Speed Bearingless Permanent Magnet Synchronous Motor

Due to the bright development prospect of the self-levitation technology in the field of high-speed motor and the importance of eddy current loss to permanent magnet motor, a 10kW, 100krpm ultrahigh-speed bearingless permanent magnet synchronous motor (UHSBPMSM) is designed in this paper and the eddy current loss are reduced with the using of auxiliary slots and multi-objective optimization method. Then the thermal analysis is carried out to reveal the effects of suspension windings and the optimization scheme on temperature rise of the designed UHSBPMSM.