Electric Motor Failure

Most motor failures stem from damaged bearings or stator windings.

The most common failures are:

  1. bearing failure
  2. stator winding failure
  3. overheating
  4. power supply anomaly
  5. humidity
  6. contamination
  7. unusual mechanical loads

Bearing Failure

The main reasons for bearing failure are:

Stator Winding Failure

Electrical insulation deteriorates at a rate that doubles for every 10°C increase in temperature.

Overheating

The reasons for overheating are numerous and include:

Power Supply Anomaly

Humidity

If the motor is stopped and cools down it may drop below the dew point. Moisture weakens the insulation and contributes to bearing corrosion.

Contamination

This results in: abrasion, corrosion and overheating. Small particles in the windings can gradually wear the insulation away as the wires flex during operation.


See also: Electric Motor Bearings, Electric Motor Windings, Electric Motors.

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Subjects: Electrical Engineering