17-034 Multilayer Winding Configuration for AC Machines

December 20, 2016

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Current commercially available AC winding machines usually use fully-pitched or chorded type.  However, this winding configuration has end-winding lengths that are long which reduces power conversion efficiency and causes large unwanted stator conductor loss.  An alternative configuration is a concentrated wound design which has the advantage of lower end-winding length and low stator conductor loss, but however has the disadvantage of large unwanted space harmonics in air-gap MMF resulting in large iron loss, low power factor, large torque ripple.

Researchers at North Carolina State University have developed a novel alternative winding configuration for AC electric winding machines that improves performance vs. current configurations and is able to be integrated into commercially available wound machines.  This new configuration holds the positive features of both concentrated and chorded winding.   It provides high quality rotating MMF with reduced space harmonics, minimizes torque ripple and improving power factor.  A shorter end-winding length reduces losses and improves efficiency.

This new configuration improves machine performance and requires no change in manufacturing process.


  • Improved machine performance compared to current configurations.
  • Reduced losses.
  • Improved power factor.
  • Improved efficiency.
  • Integrated into current state of the art at no additional costs.




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