Abstract
A new formula is proposed for calculation of the central demagnetization coefficient for hollow cylindrical bars made of soft magnetic materials. The nonuniformity of the demagnetizing field was taken into account by means of averaging, over the volume, the density of fictitious magnetic charges on the surface of the hollow bar and using an empirical expression for the magnetization distribution over the surface. The calculations performed according to the proposed formula are compared to experimental data, including those obtained by other authors. The new formula is shown to be applicable to the calculation of the central demagnetization coefficient for hollow cylindrical bars made of soft magnetic materials in a broad range of bar dimensions.
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