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Article

Stator I2R loss: Considerations for rewinds and redesigns

  • March 2013
  • Number of views: 5529
  • Article rating: 4.0

Mike Howell
EASA Technical Support Specialist

Aside from managing his family’s brewery in England, J.P. Joule did some pretty amazing work in physics dur­ing the mid-nineteenth century. Joule discovered that the rate at which heat is produced by a steady current in any part of an electric circuit is proportional to the resistance and the square of the current. So, the I2R loss of a conductor is not creatively named.

How does this apply to motor stator windings? The stator I2R loss is typically the largest contributing factor to the stator winding tempera­ture rise and the largest detractor of efficiency.

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Recommended Practice for the Repair of Rotating Electrical Apparatus
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The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.

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