Détection détats de fonctionnement à partir dune analyse du signal dalimentation

We want to solve a problem one faces in the automobile industry. We aim to develop a method capable of precision measurements on systems made up of four coupled electric machines hermetically enclosed, each having three possible states of operation. The main problem comes from the impossibility of making direct measurements inside the enclosure, the only measurable quantity being the global input signal. The method introduces a technique to separate the states of operation from that of failure, using an analysis in Fourier space of the small variations of the input signal.