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Lookup NU author(s): Dr Rafal Wrobel
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The accurate prediction of the ac copper loss together with its thermal behaviour is crucial in the design of electrical machines, transformers and inductors. The commonly used figure of merit, when describing the ac copper loss, is a ratio of the equivalent ac and dc resistance (Rac/R dc). This ratio defines the average ac copper loss as a function of frequency. However, as the ac and dc components of the copper loss scale differently with temperature a single value of Rac/Rdc derived for one temperature might be inadequate when used in thermal modelling. In this paper, the authors discuss limitations and applicability of the existing scaling techniques. The emphasis is placed on the method proposed earlier by the authors. The proposed scaling approach is illustrated on example test coils. Both theoretical and experimental data is provided and discussed. © 2012 IEEE.
Author(s): Wrobel R, Griffo A, Mellor PH
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: Proceedings - 2012 20th International Conference on Electrical Machines, ICEM 2012
Year of Conference: 2012
Online publication date: 12/11/2012
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