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Derivation and scaling of AC copper loss in thermal modeling of electrical machines

Lookup NU author(s): Dr Rafal Wrobel


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Accurate prediction of temperature-dependent ac winding loss effects is crucial in the design of electrical machinery. Average ac winding loss as a function of operating frequency is commonly characterized by the ratio of the equivalent ac and dc resistances (Rac/Rdc). However, as the ac and dc components of the winding loss scale differently with temperature, a single value of Rac/Rdc derived for one temperature can be inadequate when used in thermal modeling. In this paper, methods of deriving the Rac/Rdc ratio, together with scaling techniques of the ac winding loss accounting for thermal effects, are discussed. As an alternative to computationally intensive 3-D finite-element analysis, an experimental approach based on tests on full-scale stator assemblies is proposed. A previously proposed scaling technique of the ac winding loss is discussed and developed further. The proposed techniques of deriving the ac winding loss accounting for temperature variation are illustrated using both theoretical analysis and experimental data. © 1982-2012 IEEE.

Publication metadata

Author(s): Wrobel R, Salt DE, Griffo A, Simpson N, Mellor PH

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Industrial Electronics

Year: 2014

Volume: 61

Issue: 8

Pages: 4412-4420

Print publication date: 01/08/2014

Online publication date: 04/06/2013

Acceptance date: 23/05/2013

ISSN (print): 0278-0046

ISSN (electronic): 1557-9948

Publisher: IEEE


DOI: 10.1109/TIE.2013.2266088


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