Frequency Dependence of the Resistance and Inductance of Solid Core Magnets

A simple model is used to obtain, from basic field theory, expressions for the equivalent dynamic resistance and inductance of non-laminated iron core magnets when small amplitude sine waves modulate the D. C. magnet excitation. The approximations involved when applying the model equations to practical magnets are discussed. Deviation of calculated values from experimental data is of the order of 10% when the level of magnet excitation is low. Computed values of R and L may be used for field stability and ripple reduction studies.