The effect of the magnetization distribution within anisotropic alnico magnets upon field calculation

Magnetization characteristics of an anisotropic alnico permanent magnet have been measured at 10° increments from the preferred to the transverse axes. These are shown to correspond to results obtained in a magnetometer. Although the magnetization varies in magnitude and direction throughout the volume of alnico magnets, the rotation of magnetization may therefore be modelled using J vs. H characteristics. In fact, it is found that only curves for mutually perpendicular directions should be used, and these are incorporated in a rapid method for modelling these magnets. This new technique allows a non-uniform magnetization distribution to be determined from self-demagnetizing fields that have been calculated using a uniform magnetization distribution, thus eliminating a lengthy iterative procedure.