Hybrid sliding mode speed control strategy of surface-mounted permanent magnet synchronous motor based on improved marine predator algorithm

Abstract This study aims to enhance the speed tracking performance of surface-mounted permanent magnet synchronous motor (SPMSM) drive systems. A hybrid sliding mode controller is proposed, integrating a novel fast integral terminal sliding mode control with an extended sliding mode disturbance observer. Based on the mathematical model of SPMSM in the rotating coordinate system, a sliding mode controller using the fast integral terminal sliding mode surface is designed. This design improves both dynamic and steady-state performance. An improved dual power reaching law is further developed as the switching term. To address internal and external disturbances, an improved extended sliding mode disturbance observer is employed. The observer estimates and compensates for disturbances through feedforward control. The stability and convergence of the system are rigorously validated using the Lyapunov theorem. Additionally, an improved marine predator algorithm optimizes the controller parameters. Simulation comparisons with existing controllers demonstrate that the proposed controller exhibits superior speed tracking performance, immunity to disturbances, reduced chatter, and enhanced robustness of the system.