三相交流主动磁轴承参数设计与特性分析

摘要

A mathematical model of the suspension forces is established for three-phase inverter-fed AC radial magnetic bearings. According to the requirement the suspension forces, parameters of an experimental prototype are calculated. The magnetic field and suspension forces of the rotor are verified using Ansoft. Nonlinearity of the suspension forces and the coupling characteristics of the movement between two degrees of freedom around the balance position are calculated and analyzed. The results show that the mechanical configuration and magnetic circuits of the magnetic bearing are correct, and the suspension magnetic forces satisfy the design requirement. Suspension forces have good linearity and symmetry around the balance position, and the movement of two degrees of freedom around balance position has no coupling.%建立了一种三相逆变器驱动的交流主动磁轴承的悬浮力数学模型,根据实验样机悬浮磁力的要求,给出了实验样机参数计算过程.利用Ansoft对该结构磁轴承的磁场和转子受力情况进行仿真验算,并对磁轴承悬浮力非线性和转子在平衡位置附近的运动耦合性进行了计算分析.研究结果表明:这种磁轴承机械和磁路结构合理,悬浮磁力满足设计要求,悬浮力在平衡位置附近具有较好的线性和对称性,二自由度运动几乎没有耦合.