Design Of Nonsingular Fast Terminal Sliding Mode Speed Controller For Permanent Magnet Synchronous Motor

Aiming at the problem that the accuracy of the control system decreases under the condition of loss of excitation fault of permanent magnet synchronous motor, a non-singular fast terminal sliding mode control (NFTSMC) algorithm is proposed. Firstly, Build a mathematical model of PMSM for demagnetization fault. Secondly, Design of NFTSMC controller based on speed loop, The extended state observer is used to monitor the change of flux linkage to improve the estimation accuracy of flux linkage, And feed it back to NFTSMC controller to realize fault-tolerant control of PMSM loss of excitation fault, The system response speed is improved while reducing the system buffeting. Finally, The effectiveness and superiority of the proposed NFTSMC algorithm are verified by simulation.