Sliding Mode Observer for Rotor Faults Diagnosis

Although induction motors are traditional thought to be reliable and robust, the possibility of faults is unavoidable once the machines can be exposed to different hostile environments, misoperations, and manufacturing defects. Therefore, motor monitoring incipient fault detection and diagnosis are important topics. This paper presents a method for on-line induction motor monitoring with the purpose of detecting and locating a single rotor broken bar. The method avoids any frequency analysis and observes instead the machine state with the help of the two models. The torque difference between the two models indicates a fault. The technique utilizes input signals from standard transducers. An experimental setup has been constructed to implement the new technique in on-line model