PMSM Control Based on the New Nonsingular Fast Terminal Sliding Mode Control Algorithm

The control of the stable platform is the core part of dynamic directional rotary steerable drilling system. The control accuracy of the stabilized platform is directly determined by its motor control system. For the control system of a permanent magnet synchronous motor (PMSM), the traditional PI control has large overshoot and weak anti-interference ability. The classical sliding mode control (SMC) has large chattering. In order to solve the above problems, a new nonsingular fast terminal sliding model (NNFTSM) control algorithm is proposed in this paper. The controllers of the PMSM control system based on the NNFTSM control algorithm are designed. The PI control algorithm and the nonsingular fast terminal sliding model (NFTSM) control algorithm are used as comparative algorithms to verify the superiority of the NNFTSM control algorithm in the PMSM control system. The simulation is carried out and shows that the NNFTSM control algorithm has faster response speed, no overshoot, stronger anti-interference ability and smaller chattering. The effectiveness of the NNFTSM control algorithm for the PMSM control system is verified. This work has a certain guiding significance for the control research of the stable platform.