Abstract
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.
Highlights
This paper explores the impact of adopting fractional-conductor distributed winding arrangements and/or the use of semi-magnetic slot wedges on the various design and performance criteria of wound field synchronous machines (Fig. 1)
If this is a synchronous generator, the machine will have a higher fundamental armature voltage capability as the fundamental winding factor has been increased by 1.46%
The use of fractional conductor windings is useful in fine-tuning the armature voltage, E, in synchronous machines, which can be written;
Summary
This paper explores the impact of adopting fractional-conductor distributed winding arrangements and/or the use of semi-magnetic slot wedges on the various design and performance criteria of wound field synchronous machines (Fig. 1). Particular emphasis is on exploiting any potential performance improvements in large synchronous generators and electrically excited automotive traction motors It has been shown in the literature that the wound field synchronous machine can provide superior performance to permanent magnet or reluctance machines for long-range electric vehicles [1], and is a very active research area, with this technology being adopted by Renault [2] in their electric vehicle range. Semi-magnetic wedges have been subject to some study but are lacking widespread adoption despite their apparent benefits [5] This paper explores these two technological advances in both application contexts and seeks to demonstrate the usefulness of those technologies, while discussing challenges to their adoption. The aim of this paper is to explore the adoption of these two technologies in synchronous machines and draw general conclusions regarding their advantages and/or disadvantages against set performance criteria, as outlined
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