Abstract EN:

The present work is divided in five sections. The first one concerns a bibliographical study of the actual iron loss measurement devices. A critical study of their own reliability has been developed to show the obvious incompatibility between the measured and real values met in rotating electrical machines. In the second section , we have used the measurement device realised in Marseilles for the characterisation of two kinds of electric alloys ; one is French made and the other Japanese made. This work was under an industrial contract with a group of French motorists. How do they behave under rotating field conditions ? Is it possible to model the evolution of the power loss with respect to the different parameters ? All these questions lead us to achieve an experimental study. The third section deals with the principle of a new iron loss measurement method which tries to take into account the real working conditions of electrical machines. The geometry of the samples, the air gap field space distribution, the signal generated by the current source which feeds the machine, etc, are influential parameters for the iron loss. That needs a global approach of this problem. So, we have tried to design a new measurement device. The next section shows how to use the new acquisition system described in the previous section to represent the magnetic reluctance from an equivalent schema. Finally, the last section deals with an inverse problem used in other topics to solve the problem of the anisotropy which has never been treated in a satisfactory way.