Detection of stator winding faults in induction machines using flux and vibration analysis

• The use of internal flux sensor is characterized as being a new proposal.
• Vibration and flux are used to distinguish short-circuit and unbalanced voltage.
• Envelope analysis proved to be very useful in the verification of the frequencies.
• Clear variations of specific frequency's amplitude identify the studied faults.
• The used techniques can be complementary and applied to more complex cases.

This work aims at presenting the detection and diagnosis of electrical faults in the stator winding of three-phase induction motors using magnetic flux and vibration analysis techniques. A relationship was established between the main electrical faults (inter-turn short circuits and unbalanced voltage supplies) and the signals of magnetic flux and vibration, in order to identify the characteristic frequencies of those faults. The experimental results showed the efficiency of the conjugation of these techniques for detection, diagnosis and monitoring tasks. The results were undoubtedly impressive and can be adapted and used in real predictive maintenance programs in industries.