摘要：针对三相无轴承异步电机这一多变量、非线性对象的强耦合问题，提出了一种基于逆系统方法的解耦控制策略。在转子磁场定向坐标系下分析了转矩系统的可逆性并求解逆系统，将其解耦成转速和转子磁链两个二阶子系统；对悬浮控制子系统采取负反馈控制，所需的气隙磁场利用转子磁链和定子电流辨识得到；最后对系统进行综合和仿真研究。仿真结果表明该控制方法具有良好的解耦控制性能，所给控制策略是可行的。

关键词：无轴承异步电机；逆系统；解耦控制；气隙磁链
Abstract: For the strong coupling problem of three-phase bearingless induction motor which is a multi-variable and nonlinear object, this paper proposed a decoupling control strategy based on inverse system method. The reversibility of torque subsystem was analyzed based on rotor flux orientation, and the inverse system method was ananlyzed also. Then the torque subsystem was decoupled into two second-order linear subsystems: one is the rotor speed system; the other is the rotor flux system. The suspension control subsystem adopted negative feedback control, the required air-gap flux linkage was obtained from the rotor flux and stator current. Finally, synthesis and simulation of the whole system were researched. Simulation results demonstrate that good performance of decoupling control can be achieved. The presented control strategy is feasible.

Key words: bearingless induction motor；inverse system；decoupling control；air-gap flux linkage