A High DB/DT, Square-Pulse Excitation Magnetic Core Test Stand for Comparison of Ferrite, Metglas, and Nanocrystalline Materials

Summary form only given. A test stand was developed to generate energy loss and permeability data under square-pulse magnetic excitation for several ferri-and ferromagnetic materials. The test stand consists of a coaxial transmission line pulse-charged to 100 kV that is discharged into a magnetic core load. The magnetization rates achieved in the experiments extend from 5 to 50 T/mus, corresponding to saturation times from 40 to 100 ns. In comparison, recent research using similar materials have discussed energy loss and permeability data up to a magnetization rate of 1 T/mus. The development of the test stand will be discussed in detail, and test results for ferrite CN20, Metglas 2605CO, and the nanocrystalline alloy Finemet FT-1HS will be presented and discussed. In addition, a figure of merit known as the loss factor will be used for relative core-to-core comparisons. In order to verify the accuracy of the data, the test results for Metglas 2605CO and Finemet FT-1HS will be compared with those of previous experiments discussed in the literature in a similar parameter space.