Measurement System for Characterization of Ferromagnetic Cores Under Controlled Magnetic Field Waveform

The aim of this letter is to present a prototyping measurement system for the characterization of ferromagnetic cores under a controlled magnetic field. The main part of the system is a short-circuited magnetizing coil that forms a relatively large square loop. The loop stands fixed in the vertical plane, and it is equipped on one side of the square with a connector for opening and closing of the loop. Thus, a ring-shaped core made of grain-oriented electrical steel can be placed around the loop and become magnetized. A number of measurements have been performed using the system to validate its applicability. Experiments were performed for the sinusoidal and triangular waveforms of the magnetic field, under quasistatic and dynamic conditions. In addition to the presentation of the measurement system, this letter also presents measured hysteresis loops and corresponding energy loss. Part of the results obtained with the presented method are compared with the results obtained using the standardized method. The main features of the measurement system are discussed.