一种新型三极交流磁轴承原理与解耦控制

摘要：阐述了一种新型三极交流磁轴承的基本结构与工作原理，用等效磁路法推导了其悬浮力数学模型。针对三极交流磁轴承在两相静止坐标系下数学模型的强耦合特性，采用逆系统方法将其解耦为伪线性系统，并在该伪线性系统的基础上利用线性二次型调节器（Linear Quadratic Regulator，简称LQR）设计了满足性能指标的控制器。仿真试验表明这种解耦控制策略不仅能够实现三极交流磁轴承径向位移之间的动态解耦，而且可以实现转子稳定悬浮，并且系统具有良好的动、静态性能。

Principle and Decoupling Control of an Innovative Three-pole AC Magnetic Bearing

Abstract：The configuration and working principle of a innovative three-ploe AC magnetic bearing was introduced. The flux path was calculated by using equivalent magnetic circuit, and the mathematical models of the suspension forces were deduced. Aiming at the coupling identity of the mathematical model of the magnetic bearing in two-phase static coordinates, a pseudo-linear model is given based on the inverse system method. Finally, a linear quadratic regulator is designed to meet performance indexes of the pseudo-linear system. The simulation experiments have shown that this kind of decoupling control strategy can realize dynamic decoupling control between radial displacements of the magnetic bearing, the rotor can be suspended steadily and the whole control system has good dynamic and static performance.