Rotor Fault Detection in Induction Machines: Methods and Techniques - State-of-the-Art

Fault detection, on-line condition monitoring and fault diagnosis of induction machines have received considerable attention in the last twenty years. Despite of various, more or less questionable practical results obtained, the topic increased in interest especially concerning those methods and techniques which are related to rotor fault detection case. Although the recent trend is toward the non-invasive, potentially sensorless methods (that use more and more sophisticated mathematical models in order to avoid false alarms), the present paper takes also into consideration the traditional, dedicated techniques in use. However, most of these methods in use are limited to the case of the three-phase squirrel cage induction motor. A wide range of literature is cited in order to provide appropriate references. Some critical comments regarding the new achievements are also included