Stator Related Faults
Static Eccentricity / Casing Distortion / Soft Foot / Loose Stator Windings / Shorted lamination
Diagnosis: Stator faults will generate high vibration at twice the line frequency (2xLF).
Rotor Related Faults
Rotor Eccentricity
Diagnosis: 1X peak and 2xLF with pole pass sidebands
Cracked Rotor Bar
Diagnosis: 1X peak and harmonics with pole pass sidebands
Loose Rotor Bar
Diagnosis: A peak at the Rotor Bar Frequency with 2xLF sidebands
Rotor Bow
Diagnosis: bow results in an unbalance condition with all its usual symptoms
Loose Rotor
Diagnosis: 1X and harmonics
Loose Connections Fault
Phasing problems due to loose connectors
Diagnosis: 2xLF with sidebands of one-third line frequency