Research Repository

See what's under the surface

A thermal improvement technique for phase windings of electrical machines

Galea, Michael; Gerada, C.; Raminosa, Tsarafidy; Wheeler, Patrick

Authors

Michael Galea michael.galea@nottingham.ac.uk

C. Gerada chris.gerada@nottingham.ac.uk

Tsarafidy Raminosa

Patrick Wheeler pat.wheeler@nottingham.ac.uk

Abstract

In electrical machines, a higher torque/force density can usually be achieved by increasing the current density in the windings. However, the resulting increase in copper losses leads to higher temperatures in the coils, especially in the centre of the slots where the thermal resistance to the ambient/cooling surfaces is highest. In this paper a novel, simple technique is presented in which a higher thermal conductivity path between the centre of the slot and the cooling arrangement is created, thus increasing the heat flow away from the slot centre. A lumped parameter thermal model is presented and used along with finite element analysis to investigate the effectiveness of the proposed technique. The lumped parameter model is also used for optimizing the high conductivity path for maximum air-gap shear stress and to obtain a compromise between the reduced slot area and the improved temperature distribution. Experimental validation is then presented to compare the predicted results with the measured results on a purposely built instrumented set-up.

Journal Article Type Article
Publication Date Jan 31, 2012
Journal IEEE Transactions on Industry Applications
Print ISSN 0093-9994
Electronic ISSN 1939-9367
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 48
Issue 1
Institution Citation Galea, M., Gerada, C., Raminosa, T., & Wheeler, P. (2012). A thermal improvement technique for phase windings of electrical machines. IEEE Transactions on Industry Applications, 48(1), doi:10.1109/TIA.2011.2175470
DOI https://doi.org/10.1109/TIA.2011.2175470
Keywords Permanent magnet machines, Electrical machine windings, High current density, Thermal improvements
Publisher URL http://ieeexplore.ieee.org/document/6074939/
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information c2012 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works

Files

A Thermal Improvement Technique for Phase Windings of Electrical Machines.pdf (739 Kb)
PDF

Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf




Downloadable Citations