Converting Blogs
Motor failure: Rotor faults
By Clarence Klassen
The rotor is the moving part of an ac induction motor and is subject to the greatest number of faults. These include:
The rotor is the moving part of an ac induction motor and is subject to the greatest number of faults. These include:
- Thermal overload, unbalance due to contamination or abrasion
- High rotor losses due to foreign particles
- Hot spots due to inadequate ventilation
- Sparking due to excessive temperature
- Rotor pullover due to casting faults
- Noise due to loose laminations
- Vibration
- Runs off magnetic center due to breakage
- Saturation of the laminations due to design
- Circulating currents due to steel or other deviations
- Stress concentrations
- Overspeeding
- Cyclic stresses
- Centrifugal force
An excellent article describing motor rotor faults including photos is in IEEE Industry Applications, Vol.18 No. 6, “Root Cause Methodology For Induction Motors” by Bonnet, Austin H.