Study on Backstepping Control and dSPACE Realization for Induction Motors

Due to its great potential value in applications and theory,nonlinear control strategies of induction motors,especially backstepping control methods,have been a focus.The main purpose is to develop a control algorithm that forces the induction motor to track position trajectories with immeasurable load rotor flux and load velocity.To achieve this,a partial state feedback backstepping control method was developed.The control strategy utilized a novel rotor velocity and flux observer which facilitates the potential for improved position tracking transient performance.In addition,the ovserved integrator backstepping technique was utilized to ensure the observer-based controller remains bounded.Backstepping control combined with partial state feedback scheme not only has the advantages such as nonexistence of singularity,but also leads to a simple control structure and enhances the robustness of the control system.The on-line simulation results based on dSPACE illustrate the effectiveness of the backstepping control strategy for the induction motors under practical conditions.It is shown the objective of position tracking is satisfied even with unknown motor speed and flux information.