Routine offline and shop stage gate tests should include Phase-to-Phase Inductance measurements. Phase-to-Phase measurements can be useful for diagnosing a variety of situations:
• Poor or incorrect rework such as reversed coil winding leads
• Faults in power cables or main contacts in the power circuit
• Air gap eccentricity problems
• Shorted turns such as stator phase-to-phase and coil-to-coil
• Rotor porosity and lamination damage
• Broken/cracked rotor bars or end rings
For more information read Influence of Residual Flux on the Measurement of Inductance at
http://www.pdma.com/pdfs/Articles/Influence_of_Residual_Flux_on_the_Measurement_of_Inductance.pdf.