Eddy-Current Losses in the Solid Back-Iron of PM Machines for different Concentrated Fractional Pitch Windings

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-ir...

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Bibliographic Details
Main Authors: Polinder, H., Hoeijmakers, M.J., Scuotto, M.
Format: Conference Proceeding
Language:English
Subjects:
Air gaps
back-iron
Coils
concentrated windings
Contracts
Demagnetization
distributed windings
eddy currents
fractional-pitch windings
Machine windings
Magnetic flux
permanent-magnet machines
Power generation
Solid modeling
Stator windings
Teeth
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Summary: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.
DOI:10.1109/IEMDC.2007.382744