A Predefined Time Fast Terminal Sliding Mode Predictive Speed Control for PMSM Drives

This article proposes an improved predefined time sliding mode predictive control strategy for surface-mounted permanent magnet synchronous motor to achieve superior antidisturbance capability and tracking performance. Compared to the conventional predefined time sliding mode surface (PTSLMS), a linear term is introduced to enhance the convergence rate of system states. A more broadly applicable formulation of the PTSLMS is presented. Then, a cost function is provided to make the one-step forward prediction of the sliding mode surface approach the target value. The lumped disturbances from load torque and uncertainties are estimated and compensated by an enhanced predefined time disturbance observer. Simulations and experiments are carried out to verify the effectiveness of the proposed method in dynamic response performance and antidisturbance capability.