Decoupling Control of Magnetically Levitated Induction Motor with Inverse System Theory

Abstract

A magnetically levitated induction motor is a multivariable, nonlinear and strong coupling system. In order to achieve the rotor suspending and working steadily, it is necessary to realize dynamic decoupling control between torque force and radial suspension forces. In this paper, a method based on inverse system theory is used to study on decoupling control of magnetically levitated induction motors. Firstly, the working principle of radial suspension forces is expounded, and then the state equations of this motor are set up. Secondly, feasibility of decoupling control based on inversion theory for magnetically levitated induction motor is discussed in detail, and the dynamic feedback linearization method of system decoupling and linearizing is used. Finally, linear control system techniques are applied to these linearization subsystems to synthesize and simulate. The simulation results have shown that this kind of control strategy can realize dynamic decoupling control between torque force and radial suspension forces, and the control system has fine dynamic and static performance