Sensorless Control of PMSM Based on Fuzzy Integral Terminal Sliding Mode Observer

Abstract

To address the challenges of low estimation accuracy and strong chattering in traditional sliding mode observer (SMO) for permanent magnet synchronous motors (PMSM), a fuzzy integral terminal sliding mode observer (FITSMO) is proposed. First, based on the analysis of nonlinear sliding mode surface theory, an integral-type terminal sliding mode surface is constructed, which enables the current observation error to converge to zero within a finite time, effectively reducing chattering phenomena and enhancing the accuracy of the system’s observation. Then, the fuzzy logic controller (FLC) is introduced to combine the sliding mode gain and fuzzy control by designing the fuzzy rule base and the membership function, so that the sliding mode gain is dynamically adjusted according to the actual operating conditions. Both simulation and experimental results demonstrate that the proposed algorithm can enhance the speed and accuracy of position observation for the sliding mode observer.