Composite Sliding Mode Control for PMSM Speed Regulation System

In this paper, for the purpose of optimizing the dynamic performance of the permanent magnet synchronous motor (PMSM) speed regulation system, the improved NFTSMC based on a new sliding mode reaching law (NSMRL) is proposed. This NSMRL can dynamically adapt to the variations of the controlled system, which allows chattering reduction on control output while maintaining high tracking performance of the controller. To further improve the performance of the PMSM system, a composite sliding mode controller is developed. This control method introduces the internal mode disturbance observer (IMDO) to estimate the load disturbance and adds a feed-forward compensation item to the output of the improved NFTSMC. Simulation results demonstrate that the proposed method has better suppression of chattering effect and disturbance rejection ability.