Non-singular Fast-Terminal Sliding-Mode Control System Based on Improved Reaching Law

A synchronous control system with high dynamic performance, high synchronous control performance is built in this study for permanent magnet synchro-nous motor (PMSM). This study designs a non-singular fast-terminal sliding-mode control strategy based on an improved reaching law (INFTSMC) for the speed loops of PMSM. The Improved sliding-mode reaching law incorporates both the power term of the system state and the check-function term related to the sliding-mode function into the conventional sliding-mode reaching law. Furthermore, the non-singular terminal sliding-mode disturbance observer is introduced to estimate and compensate for the disturbance existing in the driving process. The efficacy of the proposed control strategy is confirmed through simulation that the synchronous control system provides fast convergence speed, weak chattering, excellent synchronous control performance.