Transient Currents and Forces of a Plunger Core Reactor by using 3D Field-Circuit Coupled Finite Element Analyses

The transient behaviour of a plunger core reactor with four parallel connected winding paths is calculated from voltage driven finite element analyses. Thereby, the 3D finite element model utilizes a direct circuit coupling to take into account for the applied voltage and the parallel windings paths. Consequently, the unknown coil currents are obtained with the full influence of the axial position of the plunger core. Moreover, the Lorentz forces acting on the coil windings and the Maxwell forces acting on the plunger core are calculated in dependence of the plunger core air-gap