Fault-tolerant control of PMSM based on second-order sliding mode

This paper presents a fault-tolerant control (FTC) based on a second-order sliding mode using a super-twisting algorithm applied to a 3-phase permanent magnet synchronous motor (PMSM). First, a second-order sliding mode control (SOSMC) is applied to the direct field-oriented control (FOC), which improves dynamic response and anti-disturbance performance by maintaining the speed and currents within their desired reference values. Second, a second-order sliding mode observer (SOSMO) is constructed in order to estimate and reconstruct the faults. Finally, the effectiveness of the proposed FTC has been verified through simulation using MATLAB/Simulink software.