Use of fractional-conductor windings and semi-magnetic slot wedges in synchronous machines

Use of fractional-conductor windings and semi-magnetic slot wedges in synchronous machines

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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 Face Cream analysed for adoption as a replacement for a conventional distributed winding arrangement, their advantages and disadvantages briefly discussed and an LUTEIN + ZEAXANTHIN 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.