A new prototype of diagnosis system of inner-faults for three-phase induction motors developed by expert system

During practical operation of three-phase induction motors in industry, the inner faults may occur in their rotor and stator windings. These kinds of faults seriously influence the operation of the motor. Moreover, due to insufficient research and development in the diagnosis system of inner-faults of an induction motor, new research on the prototype of this diagnosis system of inner-faults for three-phase induction motors, developed by the expert system are presented. This paper provides a comprehensive understanding of the fundamental signal processing techniques that underpin the diagnosis systems, and demonstrate how they are applied. As we have found in analyzing the inner-fault of a squirrel-cage rotor for three-phase induction motors by "bi-directional revolving magnetic fields" concept, the stator currents at frequencies f₁ and (1-2s)f₁ exists. Signal processing involves the measurement and analysis of the fluctuations about the selected variables in order to provide the detection of the motor malfunctions