Precompressed and Stranded Aluminum Motor Windings for Traction Motors

James Widmer, Richard Martin, Barrie C. Mecrow

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)
1463 Downloads (Pure)


There are benefits if copper windings are replaced with aluminum in applications that are cost- and mass-sensitive, such as automotive traction; these include the low cost of aluminum, low mass of aluminum, and the ease of motor recycling at the end of life. However, the relatively low electrical conductivity of aluminum compared to copper needs to be overcome. Precompressed motor coils have been shown to produce very high fill factors (> 75%), reducing dc-winding losses, therefore enabling the use of aluminum conductors. However, the single-stranded conductors used can be prone to high ac losses due to skin and proximity effects. Therefore, a method of manufacture of precompressed coils made from stranded/Litz wire is needed, allowing ac losses to be reduced to low levels. This paper describes the development and test of stranded, precompressed aluminum coils, which have been developed for use in an automotive traction application.
Original languageEnglish
Pages (from-to)2215 - 2223
Number of pages9
JournalIEEE Transactions on Industry Applications
Issue number3
Early online date11 Feb 2016
Publication statusPublished - 1 May 2016
Externally publishedYes

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  • Windings
  • Aluminum Conductors
  • Electric Machines


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