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Stator I2R loss: Considerations for rewinds and redesigns

  • March 2013
  • Number of views: 5440
  • 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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