Optimization Design of Permanent Magnet Assisted Single Winding Bearingless Synchronous Reluctance Motor

Conventional permanent magnet assisted bearingless synchronous reluctance motors (PMa-BSynRM) have suspension force windings and torque windings in the stator, and their reliability may be restricted by the complexity of stator windings and lack of the compactness of the motor structure. To balance the contradictions mentioned above, in this paper, a novel permanent magnet assisted single winding bearingless synchronous reluctance motor (PMa-SWBSynRM) is proposed. Firstly, the motor topology of the proposed motor is described. Secondly, the mathematic model of the motor is derived with Maxwell stress tensor method. Then, through finite-element analysis (FEA), the electromagnetic characteristics of the motor is analyzed in detail. Finally, after the electromagnetic analysis, the thermal analysis of the PMa-SWBSynRM is discussed based on the model analysis. The research results indicate that the suspension force of the PMa-SWBSynRM increases approximately 18.27% and has the better operational performance, compared with the PMa-DWBSynRM.