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Lookup NU author(s): Dr Rafal Wrobel
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© 2017 IEEE. This paper discusses two analytical methods used in estimating the equivalent thermal conductivity of impregnated electrical windings constructed with Litz wire. Both methods are based on a double-homogenisation approach consecutively employing the individual winding conductors and wire bundles. The first method is suitable for Litz wire with round-profiled enamel-coated conductors and round-shaped bundles; whereas the second method is tailored for compacted Litz wires with conductors and/or bundles having square or rectangular profiles. The work conducted herein expands upon established methods for cylindrical conductor forms , and develops an equivalent lumped-parameter thermal network for rectangular forms. This network derives analytical formulae which represents the winding's equivalent thermal conductivity and directly accounts for any thermal anisotropy. The estimates of equivalent thermal conductivity from theoretical, analytical and finite element (FE) methods have been supplemented with experimental data using impregnated winding samples and are shown to have good correlation.
Author(s): Wrobel R, Ayat S, Baker JL
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017
Year of Conference: 2017
Online publication date: 08/08/2017
Acceptance date: 21/05/2017
Publisher: Institute of Electrical and Electronics Engineers Inc.
Library holdings: Search Newcastle University Library for this item