Internal model based fault tolerant control strategy for PMS motors

In order to increase the reliability, which is crucial topic in industrial applications and to create a fault tolerant control (FTC) unite based internal model strategy for permanent magnet synchronous motors (PMSM). Two ideas are presented in this paper. The first one is to design a robust controller, which is able to steer the current and the speed variables to their desired references under load torque disturbances. The second one is to design an internal model. This later is activated automatically as the appearances of plant fault to compensate its effect by generate an additive control law. The proposed scheme ensures closed-loop stability (based Lyapunov theory) throughout the entire closed-loop response of the system even in the presence of load torque and plant fault. Simulation results show the high precision of the proposed control techniques, and the good PMSM characteristics in healthy and during the faulty condition.