Eddy-current losses in the solid back-iron of PM machines for different concentrated fractional pitch windings

Conference paper (2007)

Authors

H. Polinder Electrical Power Processing

MJ Hoeijmakers Electrical Power Processing

M Scuotto Electrical Power Processing

Research Group

Electrical Power Processing

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Published Date

2007

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Research Group

Electrical Power Processing

Abstract

Permanent magnet (PM) machines with concentrated fractional-pitch stator windings are increasingly used because of their cost-effectiveness. In this paper, the eddy-current losses in the solid back-iron of these machines are modeled. This model is applied to calculate the losses in the solid back-iron of the linear PM generator of the Archimedes Wave Swing (AWS) for different combinations of numbers of poles and numbers of teeth. In machines with fractional-pitch windings, these eddy-current losses are considerable and depend strongly on the combination of number of teeth and number of poles. In fractional pitch machines with a coil around very second tooth, these losses are excessive.