Magnetic Core Model of a Midfrequency Resistance Spot Welding Transformer

This paper deals with the analytically described iron core model of a midfrequency resistance spot welding transformer. This model considers eddy currents, hysteresis, and the saturation effect in a laminated iron core. The proposed model is simple, based on parameters that can be obtained from a data sheet, and is easy to integrate into the circuit model of the transformer. It is applicable for the design of control algorithms, as well as a rough optimization of lamination thickness, air gap width, and sizing the transformer´s core.