New characterisation device for electric alloys

Abstract
This paper deals with the characterisation of electric alloys used in the building of electrical rotating machines. Firstly, it is shown that classical devices are not suitable. They are unable to predict the behaviour of magnetic sheets under their real working conditions : the distribution of the flux density through the section of the sheets is wrong and the anisotropy of magnetic permeability is not correctly taken into account[1][2]. Then, the results are useless to compute and design electrical machines. Then, we describe a new measurement device to enable us to test either circular smooth or slotted samples, with the use of a suitable electromagnetic travelling wave, analogous to that of the airgap of the real electrical machine[2]. Finally, we give the first results obtained with the first device realized in our Laboratory. They show clearly the possibility to take into account the physical phenomenon and translate them with respect to geometrical building parameters of rotating machines.