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Calculating the external magnetic field from permanent magnets in permanent-magnet motors-an alternative method

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4 Author(s)
Selvaggi, J.P. ; Syst. Eng. Dept., Rensselaer Polytech. Inst., Troy, NY, USA ; Salon, S. ; Kwon, O-Mun ; Chari, M.V.K.

We present an alternative method for calculating the magnetic field from a set of permanent magnets in a permanent-magnet motor. The method uses a cylindrical coordinate system to model the geometry of the structure enclosing the magnets. A Fourier series expansion yields an alternative to the more familiar multipole expansion given in spherical coordinates. The expansion is developed by using Green's function in cylindrical coordinates. A technique called charge simulation allows computation of an equivalent point charge distribution. Finally, Coulomb's law is applied to express the magnetic scalar potential in a mathematically tractable form.

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Magnetics, IEEE Transactions on  (Volume:40 ,  Issue: 5 )