基于转子磁场定向的磁悬浮异步电动机线性化解耦控制

Linearization Decoupling Control of Bearingless Induction Motors Based on Rotor Field Oriented Control

根据磁悬浮异步电动机转子磁场定向下的数学模型,应用多变量非线性控制的状态反馈线性化方法,将多变量、强耦合的非线性系统解耦成转速、转子磁链及转子位置等彼此无耦合的线性子系统。采用专家PID控制器对解耦后的线性子系统进行控制器设计。仿真结果表明,系统具有良好的动静态性能,确保磁悬浮异步电动机的稳定悬浮。

With rotor field oriented control mathematical model of the bearingless induction motor,a nonlinear controller based on state feedback linearization was designed such that the nonlinear system with multivariable and strongly coupled motion was reduced to decoupled linear subsystems including its speed,rotor flux as well as two rotor displacements.Expert-PID controllers were used to the design of these decoupled linear subsystems.To verify the effectiveness of the control scheme,some simulations were carried out and the results show satisfactory static and dynamic performances of the system which enables stable suspension of the bearingless induction motor.