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Precompressed and Stranded Aluminium Motor Windings for Traction Motors

Lookup NU author(s): Dr James Widmer, Dr Richard Martin, Professor Barrie Mecrow



This is the authors' accepted manuscript of an article that has been published in its final definitive form by IEEE, 2016.

For re-use rights please refer to the publisher's terms and conditions.


There are benefits if copper windings are replaced with aluminum in applications which 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 end of life. However the relatively low electrical conductivity of aluminum compared to copper needs to be overcome. Pre-compressed 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 pre-compressed 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, pre-compressed aluminum coils which have been developed for use in an automotive traction application.

Publication metadata

Author(s): Widmer JD, Martin R, Mecrow BC

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Industry Applications

Year: 2016

Volume: 52

Issue: 3

Pages: 2215-2223

Print publication date: 01/05/2016

Online publication date: 11/02/2016

Acceptance date: 09/11/2015

Date deposited: 20/11/2015

ISSN (print): 0093-9994

ISSN (electronic): 1939-9367

Publisher: IEEE


DOI: 10.1109/TIA.2016.2528226


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