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Common Preventable Electric Motor Failures: Windings


Winding_Failures.jpgThe below video is a 15 minute segment of an hour long presentation given by Todd Hatfield of HECO at the 2017 Reliability, Process, and Maintenance (RPM) Symposium. This presentation discusses common preventable causes of electric motor failures. This section of the presentation discusses winding related failures which account for 32% of all electric motor failures. 

This presentation discusses winding failures related to:

  • Thermal Stress
    • Voltage Unbalance, Ambient Temperatures, Load Cycling/Starting/Stopping, etc.
    • Poor Ventilation
  • Electrical Stress
    • Turn to Turn, Coil to Coil, Phase to Phase, Coil to Ground, Open Circuit
    • Insulation/dielectric Aging
    • Inadequate Insulation
    • Partial Discharge (Normally 6000v and up)
    • Transient Voltages
  • Mechanical Stress
    • Coil Movement (Poor blocking and bracing)
    • Rotor/Stator Rubbing
  • Environmental Stress
    • Moisture/Abrasion/Ventilation/Chemical

 The presentation then goes into understanding the coil design, core integrity, and how to improve a coil design.

Download What To Look For In An Electric Motor Repair Shop

Todd A. Hatfield

HECO – All Systems Go



About the author:

Todd Hatfield is a Senior Electrical Engineer at HECO. He has over 35 years' experience in generator and electric motor repair and engineering. Todd has a BS in Electrical Engineering, and his areas of expertise are: electrical and mechanical motor redesigns and engineering, root cause of failure analysis, and quality electric motor rebuilding.

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