The Non-Singular Fast Terminal Sliding Mode Control of Interior Permanent Magnet Synchronous Motor Based on Deep Flux Weakening Switching Point Tracking

This paper presents a novel non-singular fast terminal sliding mode control (NFTSMC) based on the deep flux weakening switching point tracking method in order to improve performance of permanent interior magnet synchronous motor (IPMSM) drive systems. The mathematical model (FW) is established, and calculated accurately by analyzing relationship between torque curve voltage decline curve. Next, second-order NFTSMC designed for speed loop controller ensure that system converges equilibrium state finite time. Then, an extended disturbance observer (ESMDO) estimate uncertainty system. Finally, compared with both PI (SMC) simulations experiments different working conditions, proposed has merits accelerating convergence, improving steady-state accuracy, minimizing current pulsation.