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


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      Views: (2004)   Date: (Publication Date: Sept. 2004)   Pages: ()
    • Author:  Selvaggi  J.P. Salon  S. O-Mun Kwon Chari  M.V.K. Syst. Eng. Dept.  Rensselaer Polytech. Inst.  Troy  NY  USA;  

    • Abstract:  Abstract 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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