Composite materials for low loss rotor construction

Conference paper (2011)

Authors

J.J. Wolmarans Electrical Power Processing
M. van der Geest Electrical Power Processing
H. Polinder Electrical Power Processing
Jan Abraham Ferreira Electrical Power Processing
D Zeilstra External organisation
Research Group
Electrical Power Processing
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Published Date

2011

Language

English

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Research Group

Electrical Power Processing

Abstract

The use of concentrated windings in electrical machines leads to significant rotor losses due to severe space harmonics in the airgap. Metallic retaining sleeves and sintered magnets used in high speed rotor construction have low electrical resistivities, leading to larger associated eddy currents loss. Composite materials like carbon fiber and plastic bonded magnets are investigated, due to their relative low conductivity. Analysing eddy current loss in composites can be cumbersome as they are frequently anisotropic. By observing eddy currents induced in a sample material, the material resistivity may be derived for a given direction by reverse finite element modelling. Resistivity values may be further used to calculate rotor eddy current loss.