基于逆系统的无轴承异步电机多内模切换控制

he bearingless induction motor is a multi-variable, nonlinear and strong-coupled system.In order to realize high-speed and reliable operation of motor, decoupling control must be realized between electromagnetic torque and radial suspension.Based on operation principle and mathematical model of bearingless induction motor is analyzed, this paper proposes a multiple internal model switch control strategy based on inverse system decoupling.Using inverse system method, the original system is decoupled into radial displacements, speed and flux subsystems. The theory of multiple internal model switch control is applied to design closed-loop controllers of subsystems. It can carry out on-line identification of real-time equivalent model of system.The simulation results show that the control strategy realizes dynamic decoupling among speed, flux and radial displacements of bearingless induction motor. The control system has good dynamic and static performance.