Decoupling control based on backstepping control for bearingless synchronous reluctance motor

Focused on a multivariate, strong-coupled, non-linear system of a bearingless synchronous reluctance motor (BSRM), the backstepping decoupling control method was proposed in the paper. Based on the mathematics model of the BSRM, the control system of motor speed and two radial suspension displacements was designed by using backstepping control method. Using backstepping control method, the original complicated and non-linear system was decomposed into several subsystems that were no more than orders of the system. The backstepping control strategy realized the decoupling control for the BSRM. At the same time, the control strategy reduced the adjusting parameters, and simplified the process of design. Then the stable capability of system was proved. Finally, the simulation results show the effectiveness and superiority of the proposed control method. In addition, the control method can assure global stability and has good tracking accuracy and strong robustness.