A Speed Sensor Fault Tolerant Control for a Permanent Magnet Synchronous Motor

This paper focuses on an active fault tolerant control (AFTC) system dedicated for a speed sensor faults in Permanents Magnet Synchronous Motor (PMSM) leading to degraded performance of the system. The proposed AFTC scheme is based on switching between a classical controller based on integral proportional (IP) controller under normal conditions and a robust fuzzy logic controller (FLC) in faulty case. In order to guarantee the continuity of the service and to overcome the problems caused by the sensor fault, a new FTC structure based on FLC is designed to improve PMSM drives speed controls during faulty mode. An Extended Kalman Filter (EKF) is used to estimate the PMSM rotor speed that generates a residual signal for the fault detection block (FD). Finally, a numerical simulation carried out to prove the efficiency of the proposed AFTC control strategy.