This paper presents a method to obtain the magnetic field in the (x,v) tangential direction on a DC bus. Effecti,vely, the local measurement of this signal w^ill give us the current density; repartition profile on the bus, in the 400 -10 MHz frequency range. The magnetic field repartition has been identified and show us the geometry and skin effect influences on this distribution. A special sensor has been designed to allow us this measurement in the frequency range.
Abstract-Induction machine is widely used in industrial applications, and currently numerous researches deals with its on line monitoring. A great on line monitoring would provide fault diagnosis, optimal use and quality management. However, diagnosis is, until today, mainly based on vibration analysis and/or motor current signature analysis (weel known as MCSA). This paper presents a new approach in the whole electrical drive diagnosis thought original measurements. The first part shows that the measures of the electromagnetic field emitted on the DC bus bar of the inverter can provide a relevant signature for the spectral analysis of the power drive. The second part deals with the in sight simulation prospectives, through the widely spread Partial Element Equivalent Circuit (PEEC) modelling of the surfacic conductor structures.
Les auteurs proposent une étude du champ magnétique proche émis par le bus barre d'un onduleur alimentant une machine asynchrone dans la gamme de la dizaine de kW. Tout d'abord les idées maîtresses qui ont abouti à cette étude sont présentées, puis des mesures de prospection fréquentielle précises sur le champ magnétique sont menées. Il est démontré dans cet article que les signaux captés sont exploitables pour des applications de type diagnostique de l'ensemble de la chaîne électromécanique. The authors propose a study based on a middle power (kW range) inverter DC bus bar magnetic field emission. The load is an induction motor. First of all, the main ideas that have lead to this study are exposed, then prospective measures on the magnetic field spectrum are presented. It is demonstrated here that the signals are exploitable for typical diagnostic applications of the whole electromechanical bench
International audienceIn this paper, the authors present the modelling of the impedance variation of an inverter DC bus. Modelling is done by application of the PEEC method (partial element equivalent circuit) with an additional method for computing the local charge density (analytical formulas) in order to give the local capacity. This method has been implemented so as to extract the behaviour of the local charge density, specifically for busbar structure. Results obtained in the case of an approached busbar equivalent geometry are shown. A quantification of the edges importance for the charge repartition is presented, and so its link with the HF local capacitor influence. Moreover simulations of the values of the global DC bus impedance versus frequency are compared to measures
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