Abstract
This paper evaluates the performance of fractional-slot per pole winding
configurations for tubular permanent magnet (PM) machines that can
effectively eliminate the most undesirable space harmonics in a simple and
cost-effective manner. The benefits of the proposed machine topology
winding configurations are illustrated through comparison with 9-slot,
10-pole tubular PM machine developed for a free piston energy converter
under the same specification and volumetric constraints. It has been shown
that the proposed machine topology results in more than 7 times reduction
in the eddy current loss in the mover magnets and supporting tube, and
hence avoids potential problem of excessive mover temperature and risk of
demagnetization.
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