Characterization of magnetic properties and losses of Fe-9Cr steel under transient conditions

The aim of this paper is to evaluate the magnetic properties and losses of the Fe-9Cr steel under nonperiodic conditions of the magnetic field. A first series of measurements is performed for characterizing the quasi-static major loop and various dynamic cycles obtained at different rate of the driving magnetic field H. Then, a series of “ad-hoc” experiments is defined in order to provide a good basis for discussion and validation of eddy current and hysteresis losses calculated via analytical methods. In a first case, moving from the saturation H is rapidly changed at different rates towards the opposite saturation. In a second case, minor asymmetric loops are formed after a series of major cycles. In both the cases, measurements are performed under non periodic conditions. Experimental and simulation results are reported and discussed throughout the paper.