Detection of Rotor Electrical Faults in Induction Motors during the Start-up via Torque Monitoring

The strong impact of rotor electrical faults on the magnetic field of 3-phase induction motors during the startup has led to the development of several modern diagnostic techniques. The most typically used signals for condition monitoring purposes have been the stator current and the stray flux. However, past works have noted that the stator current-based methods have some drawbacks, such as their inadequacy during very fast transients. In this paper, such unreliability is also shown for the stray flux monitoring methods. However, the torque monitoring is proposed here as a reliable alternative to detect broken rotor bar faults in induction motors.

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