Dynamical Models for Eddy Current in Ferromagnetic Cores Introduced in an FE-Tuned Magnetic Equivalent Circuit of an Electromagnetic Relay

Electromagnetic relay modeling is elaborated using a magnetic equivalent circuit (MEC). The lumped parameters of the MEC are fitted with respect to 3-D finite-element simulation by using classical optimization algorithms. An accurate dynamic material law has to be taken into account in the modeling, considering the massive core of the circuit. Two accurate dynamical models for representing eddy currents are studied. The simulation of the relay is carried out for several excitation frequencies. A comparison between measurements and simulated quantities is provided. Index Terms—AC circuit breakers (CBs), eddy currents, magnetic hysteresis, optimization methods. I