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Case Study 5500HP, 13,200v, Synchronous Motor: (Part 5) Electrical Design of Rotor


large electric motor repair, 5500HP 132000v motor - Rotor with coils and polesIn part 5 of this case study, Todd Hatfield will be reviewing the electrical design of the rotor. Below is a short 3 minute video showing the steps involved in creating the new coils for this 5500HP, 13,200v, Synchronous Motor's Rotor.

 The video below will discuss: 

  • The decision to keep the coil design and duplicate it or to come up with a new and improved design
  • Temperature differential of about 10º C - the insulation life "doubles" for every 10º C decrease in temperature
  • The CAD drawing of field coils that were mounted on the spider
  • Rewinding the new rotor coils and mounting the poles with the new coils

Before starting the video, make sure you are all caught up with the series starting with...




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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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