Abstract
The present paper describes the electromagnetic field of a permanentmagnet based device comprising parts that have a rotational movement. Theequivalence between the field of a permanent magnet and a magnetic dipoleconstitutes the main assumption. The real device is thus modelled by ahypothetical structure made of magnetic dipoles. To calculate the magnetic andthe electric field, the Hertz vector potential approach was used. The magneticdipole modelling shows a resultant magnetic field which is rotating 15 timesfaster than its field source, it underlines ways by which the anisotropy ofthe magnetic field can be greatly enhanced, and it succeeds in providingconcise computational formulae for the field and the energy flow within thefield that can be related to results of a more traditional approach, such asthe finite element method.
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