PMSM Control via Composite Logarithmic Sliding Mode Control

Abstract

Non-singular fast terminal sliding mode control (NFTSMC) is a promising control method for permanent magnet synchronous motor (PMSM) control due to its fast convergence speed. However, the presence of unknown disturbances poses a significant challenge to its performance. This article focuses on the fast position tracking and improved anti-disturbance performance for PMSM control system. The main contribution is a composite logarithmic sliding mode control (CLnSMC) scheme incorporating a disturbance observer (DOB) based on a novel sliding mode reaching law. This approach effectively mitigates the impact of unknown disturbances on the control system. The proposed scheme stands out by effectively integrating a disturbance observer (DOB) into the traditional LnSMC framework. This integration not only enhances the control performance but also enables the direct estimation and suppression of complex disturbances, thereby improving the robustness and reliability of the control system. Extensive simulation and semi-physical experimental studies have been carried out to verify the effectiveness of the proposed control strategy. The results show that the proposed CLnSMC outperforms NFTSMC in both transient response and steady-state performance.