Influence of Various Technological Manufacturing Processes on the Magnetic Properties of Nanocrystalline Cores
Résumé
Nowadays, nanocrystalline soft magnetics materials for high power applications receive more and more consideration. Nevertheless, some technological parameters can have an influence of potential significance on the performances (losses, permeability, frequency behavior…). One main drawback of the nanocrystalline materials is their brittleness. To prevent this effect in order to handle the Magnetic Circuit (MC), it is preferable to impregnate it with varnish. Moreover, thanks to the impregnation, the MC can be cut in order to insert the winding. In this paper, the influence of various technological manufacturing processes on the magnetic properties of nanocrystalline cores is studied. Firstly, nanocrystalline magnetic cores of the same size, without impregnation and with three different varnishes, are experimentally characterized with a hysteresigraph (from DC to 1 MHz). Secondly, the same MC were cut in and characterized again. This protocol gives information about the influence of the varnish employed and on the cut separately. The results also help the end-user to choose the " best " technological processes for its application (example: medium frequency transformer (MFT))