电磁轴承系统的位移刚度和电流刚度特性研究

RESEARCH OF THE CURRENT AND DISPLACEMENT STIFFNESS CHARACTERISTIC OF AMB SYSTEM

以实际应用的电磁径向轴承和推力轴承为研究对象,从理论上详细分析差动激磁方式作用下的位移刚度和电流刚度的特性,探讨位移刚度和电流刚度对系统性能的影响。研究表明,在工程误差允许范围内,位移刚度和电流刚度可视为定值,即此时电磁力方程在应用上存在较大的线性区间,因此简化的线性化模型完全可满足控制器设计的需要,且线性区间随着控制精度提高而减小。研究结果为深入了解电磁轴承系统在可能工作范围内的全部性能以及控制器设计提供依据。

The current and displacement stiffness are analysed toward radial magnetic bearing and thrust magnetic bearing with differential driving mode. The effects of current and displacement stiffness on AMB（ active magnetic bearing） system are studied in order to ensure it stable operation. The study indicated that current and displacement stiffness are constant in the range of allowable engineering error. There is a linear range to the magnetic force. The simplified linear model meets the requirement of controller design. The more precise control precision is, the smaller linear range is. The research provides the theoretical base of controller design. The study is useful for understanding AMB system performance in operation range.