A Frequency-Domain Model of Electromagnets Composed of Solid Iron Cores

A dynamic model in the frequency domain is considered for electromagnets composed of solid iron cores with a U-shaped stator and an I-shaped moving core. Fringing effect and leakage flux, which were neglected, are considered to improve a model presented before in a simple form with a half-power of frequency. The numerical frequency response of incremental magnetic flux to magnet-coil current is compared with the experimental response. We conclude that the fringing effect is significant, but the effect of leakage flux is small in the improvement of the model.