计及偏心及洛仑兹力的永磁型无轴承电机建模与控制研究

对转子偏心情况下永磁型无轴承电机中2种磁悬浮力的产生机制进行了深入的理论分析和数学建模；特別揭示了转子偏心、转矩绕组磁场对悬浮力控制及悬浮绕组磁场对转矩控制的耦合影响；提出一种实用的悬浮力及转矩控制方案，并通过在一台表面贴装无轴承永磁同步电动机上进行的实验验证了其有效性和实用性。实验结果表明考虑转子偏心和洛仑兹力的影响有效的提高了无轴承电机悬浮运行时的稳态精度和动态响应速度，极大的拓宽了其应用领域。

Study on the Modeling and Control of a Permanent-magnet-type Bearingless Motor Considering Rotor Eccentricity and Lorenz Force

This paper presents a profound theoretical analysis on mechanism of the generation of two kinds of magnetic levitation forces considering rotor eccentricity for a permanent magnet type bearingless motor.The coupling effects of Lorenz force and rotor eccentricity on the control of torque and radial levitation force are especially discussed.Based on the detailed analysis of air-gap magnetic field under eccentricity condition,a feasible levitation force and torque control strategy is developed for a surface-mounted permanent magnet type machine and the experiments validate its validity and practicability.Results reveal the consideration of influence of Lorenz force and rotor eccentricity effectively improves the static and dynamic performance of bearingless motors and vastly broadens their fields of application.