Full-Order Terminal Sliding Mode Observer for PMSM Based on Fractional-Order Model

Aiming at suppressing the chattering of the sliding mode observer in the sensorless control system, a full-order terminal sliding mode (FOTSM) observer is proposed for the position and speed of the permanent magnet synchronous motor (PMSM). Firstly, a fractional-order model of PMSM is established by using fractional calculus theory, which improves the accuracy of modeling. Secondly, an FOTSM observer method using the generalized proportional integral quadrature phase-locked loop (GQPLL) is used to eliminate the chattering of the observation signal and achieving fast convergence of the observation error. Finally, the experiments verify the superiority of the proposed scheme.