A Comparison of Measurement Procedures for Soft-Magnetic Wound Core Characterisation

The paper describes key features and shows some advantages and disadvantages of two measurement approaches used in determination of magnetic properties of soft-magnetic wound cores. The first approach is based on a measuring principle in which the current through the primary winding determines the sinusoidal magnetic flux density in the core and consequently also the sinusoidal induced voltage in the secondary winding. The second approach is a variation of the impedance method with which complex relative permeability is measured. In it, the controlled variable is the magnetizing current. In the first approach, the custom-made measurement equipment is normally used. The second approach relies on a wide variety of commercially available impedance meters.