新型无轴承开关磁阻电机双相导通数学模型.pdf

2006 4 Vol.21 No.4 21 4 TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Apr. 2006 210016 TM301 Novel Mathematical Model of Bearingless Switched Reluctance Motors With Two-Phase Excitation Cao Xi n Deng Zhiquan Yang Gang Wang Xi aolin Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Abstract In view of limitations of mathematical model only suited for the single-phase excitation mode in bearingless switched reluctance motors (BSRM), a novel mathematical model of BSRM with one or two-phase excitation is proposed. The inductance matrix is constructed based on the magnetic equivalent circuits in the two-phase excitation mode. And new mathematical formulas of radial force and magnetic torque are derived . The operating area of BSRM can be expanded to a great extent . The capability of bearing radial force is enhanced greatly. Computer simulations with magnetic-field analytical-method verify the validity and the fine characteristics of the new mathematical model. Two optimal methods to distribute currents of two-phase windings including main windings and radial force windings for practical applications are also proposed. Keywords Bearingless switched reluctance motor, mathematical model, two-phase excitation 1