DOUBLE-STATOR SWITCHED FLUX PERMANENT MAGNET MACHINES HAVING LOW ROTOR POLE NUMBERS
DOI:
https://doi.org/10.4314/njt.373.1783Keywords:
Harmonics, low rotor pole, PM usage, and unbalanced back-EMF.Abstract
In this paper, double-stator switched flux permanent magnet (DS-SFPM) machines having low rotor numbers and whose stator teeth and rotor pole numbers are relatively same is investigated. Quantitative comparison of their electromagnetic performance is also given. Two-dimensional finite element (2D-FEA) analysis is employed in the prediction of the developed machines’ performance. It is observed that the open circuit flux-linkage waveforms of the analysed machines having odd rotor poles are both symmetrical and sinusoidal in contrast to its even number rotor pole counterparts whose waveforms are asymmetrical, non-sinusoidal and unbalanced. More importantly, the developed machines with odd rotorpole numbers exhibit higher torque density than its even rotor pole equivalents.
http://dx.doi.org/10.4314/njt.v37i3.26
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