Backstepping control of a bearingless induction motor based on a linear extended state observer

The article introduces a novel backstepping control strategy for a bearingless induction motor (BL-IM) that leverages a linear extended state observer (LESO) to enhance speed response, disturbance rejection, and suspension performance. The BL-IM combines the advantages of both ordinary induction motors and magnetic bearings, making it suitable for applications in flywheel energy storage, sterile environments, and life sciences. The authors address the complexity of the BL-IM system by employing backstepping control, which decomposes the high-order nonlinear system into lower-order subsystems, ensuring stability and precision control. The LESO is used to observe and compensate for total disturbances, improving the system's dynamic performance and robustness against external loads. The proposed strategy is validated through simulations and experiments, demonstrating superior speed response, suspension performance, and anti-disturbance capabilities compared to traditional PID control and robust backstepping control methods. The article concludes by highlighting the significant improvements achieved in the BL-IM's overall performance, making it a valuable resource for specialists in control systems and electrical engineering.