Vector control of PMSM based on disturbance compensation and nonsingular terminal sliding mode

In order to enhance the global asymptotic stability of the system in sliding mode control for permanent magnet synchronous motor (PMSM), a nonsingular terminal sliding mode speed loop controller based on nonlinear sliding mode surface is designed in this paper, which ensures the finite-time convergence and improves the steady state precision of the system. Meanwhile, it avoids the singularity problem and reduces the chattering problem of the system. In order to improve the anti-interference ability and control precision of the system, a new disturbance observer is designed, which feeds the observed values back to the speed controller. Aiming at the safety and reliability of the position sensor, a sliding mode position observer is also designed which enable the real-time, fast and accurate tracking of the position signal to be realized. The simulation results show that the control strategy proposed in this paper can effectively improve the control precision and response speed of the system, and enhance the anti-interference ability of the PMSM control system