Double-Layer Fast Terminal Sliding Mode Predictive Control for PMSM Speed Regulation

A double-layer fast terminal sliding mode predictive speed control method is proposed for surface-mounted permanent magnet synchronous motors (PMSMs) in this article. First, a double-layer sliding mode structure consisting of one inner layer and one outer layer sliding mode surface is proposed, where fast terminals are included to accelerate the convergence of the targeted machine speed. Then, integral terms are adopted in the outer layer sliding mode surface for better disturbance resistance performance. The disturbances from load and friction are considered in the cost function of the proposed method to further enhance the disturbance resistance capability, and the cost function is defined as the error between the target and the real trajectory of the outer layer sliding mode surface. Finally, the effectiveness of the proposed method is validated by various simulation and test cases. The results show that the proposed method has better convergence and disturbance resistance capability when compared with the traditional linear sliding mode predictive control (LSMPC) method.