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Durham University

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Publication details for Dr Christopher Donaghy-Spargo

Donaghy-Spargo, C. M. & Spargo, A. J. (2019). Use of Fractional-Conductor Windings and Semi-Magnetic Slot Wedges in Synchronous Machines. Journal of Engineering 2019(17): 4936-4400.

Author(s) from Durham


This paper discusses two methods of altering the harmonic content of the spatial air-gap flux density waveform in
synchronous machines (generators and motors). First, fractional-conductor windings are analysed for adoption as a
replacement for a conventional distributed winding arrangement, their advantages and disadvantages briefly discussed and an
example design scenario presented. Second, analysis and discussion regarding the use of semi-magnetic slot wedges as a
replacement for glass-fibre type wedges is presented to complement the choice of winding in synchronous machines. Both
methods are shown to benefit machine performance under certain circumstances.