Optimal Design on Bearingless Permanent Magnet Synchronous Motorto Decrease Losses and Torque Ripple

Sensors & Transducers

Chen ZHANG¹  Tao ZHANG¹  Wei NI¹  Xiaohui WANG¹  Hongyun JIA² 

[1] Faculty of electronic and Electrical Engineering, Huaiyin Institute of Technology, Huaian, Jiangsu 223005, China ;School of information and control engineering, Nanjing University of Information Science and Technology, Nanjing, Jiangsu 210044, China;

关键词: High speed motor;    Bearingless motor;    Permanent magnet motor;    Eddy current loss;    Time-stepping finite element method.;   

DOI  :  

来源: DOAJ

【 摘 要 】

It is important to clarify the eddy current losses in permanent magnet rotor for temperature rising to induce irreversible demagnetization when the bearingless permanent magnet synchronous motor (BPMSM) is operating at high speed. In this paper, the torque and radial suspension force producing mechanisms of BPMSM are introduced. The relative motion relationships among radial suspension force, rotor magnetic field and suspension winding magnetic field are analyzed. The rotor eddy current losses in BPMSM with PB=PM+1 and PB=PM-1 are compared. At the same time, the radial suspension forces of different pole pair number surface-mounted permanent magnet rotors with the same stator are calculated and compared to reduce the suspension force ripples using 2D time-steeping finite element method considering the rotor rotation. The research results have shown that the BPMSM with PB=PM+1 is the most suitable for high speed operation with the minimum eddy current losses in rotor, bigger radial suspension force and smaller suspension force ripples.

【 授权许可】

Unknown