8 Motor parts and common faults

By Steven McFadyen on December 6th, 2011

Straight forward list of some common motor faults:

Shaft - Imbalance, Misalignment, Wear
Rotor - Imbalance, Rotor Bar Faults, Loose Rotor, Eccentricity
Stator - Stator Looseness, Incorrect Air Gap, Winding Fault
Motor Bearing Housing -Mechanical Looseness, Misalignment
Rolling Element Bearings - Cage, Ball/Roller, Outer and Inner Race Defects Looseness within the bearing
Motor Feet - Structural Looseness/Soft Foot
Base-plate/Foundations - Structural Looseness, Twisted Supports
Motor insulation - Insulation breakdown

If I've missed any other common faults, please take a bit of time to add them in as a comment below.

Motors, Equipment Faults, Maintenance

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Steven McFadyen

Steven has over twenty five years experience working on some of the largest construction projects. He has a deep technical understanding of electrical engineering and is keen to share this knowledge. About the author

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Rajeevankeeran says:

12/28/2011 2:38 AM

While it may not be a major problem in Low Voltage Motors, bearing damage due to circulating currents needs special mention. With Regards and wishing all a Happy New Year.

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