ANALYTICAL PREDICTION OF EDDY-CURRENT LOSSES IN FRACTIONAL SLOT PM MACHINES
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Published
Jul 12, 2010
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Abstract
Fractional slot permanent magnet machines
are gaining interest in propulsion applications. However,
they are penalized by the production of flux densities
waveforms with dense harmonic contents, leading to
additional losses in the magnets as well as in the back
iron compared to distributed winding machines. In this
paper, an analytical prediction of eddy-current losses in
the back iron including rotor and stator yokes is provided
considering a 10pole/12slot double-layer machine. The
influence of skin depth is taken into consideration for the
high harmonic frequencies. It has been found that considering
just eddy-currents caused by the synchronous
harmonic leads to very underestimated losses.
are gaining interest in propulsion applications. However,
they are penalized by the production of flux densities
waveforms with dense harmonic contents, leading to
additional losses in the magnets as well as in the back
iron compared to distributed winding machines. In this
paper, an analytical prediction of eddy-current losses in
the back iron including rotor and stator yokes is provided
considering a 10pole/12slot double-layer machine. The
influence of skin depth is taken into consideration for the
high harmonic frequencies. It has been found that considering
just eddy-currents caused by the synchronous
harmonic leads to very underestimated losses.