Sliding Mode Control Approach with Integrated Disturbance Observer for PMSM Speed System

The research on high-performance vector control of permanent magnet synchronous motor (PMSM) drive system plays an extremely important role in electrical drive system. To further improve the speed control performance of the system, a fast non-singular end sliding mode (FNTSM) surface function based on traditional NTSM control is developed. The theoretical analysis proves that the FNTSM surface function has a faster dynamic response and more finite-time convergence. In addition, for the self-vibration problem caused by high sliding mode switching gain, an FNTSM control method with anti-disturbance capability was designed based on the linear disturbance observer (DO), i.e. the FNTSMDO method was employed to devise the PMSM speed regulator. The comparative simulation and experiment results with traditional PI control and NTSM control methods indicate that the FNTSMDO method could improve the dynamic performance and anti-interference of the system.