In 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...
- What is an AC Synchronous Motor?
- Part 1 - Problem Identification and Potential Solution
- Part 2 - Evaluating Surplus Motor Option and Initial On-site Application
- Part 3 - Electrical and Mechanical Redesign Engineering
- Part 4 - Mechanical Design of Shaft and Rotor
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.