Ecole Nationale de lIndustrie Minerale

Rabat, Morocco

Ecole Nationale de lIndustrie Minerale

Rabat, Morocco

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Ngote N.,Ecole Nationale de lIndustrie Minerale | Guedira S.,Ecole Nationale de lIndustrie Minerale | Ouassaid M.,Cadi Ayyad University | Cherkaoui M.,Mohammed V University | Maaroufi M.,Mohammed V University
International Review of Electrical Engineering | Year: 2012

Rotor fault in induction motors are of significant importance since they usually lead to more severe failures. But, sometimes, particularly when the motor is unattainable (such as the engines immersed in the motor-driven pump groups), the accelerometer signal measurement is quasi impossible because of the inaccessibility in mounting transducers. An efficient and new method to detect the rotor fault may be the application of the Time Synchronous Averaging (TSA) to the stator current. This paper focuses on the detection of a rotor defect in a three-phase wound rotor induction motor. By exploiting the cyclostationarity characteristics of electrical signals, the TSA method is applied to the stator current signal which is conditioned in order to obtain a sensitive indicator, allowing the monitoring of the induction motor operation. Simulation and experimental results are presented in order to show the effectiveness of the proposed approach. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.


Ngote N.,Ecole Nationale de lIndustrie Minerale | Guedira S.,Ecole Nationale de lIndustrie Minerale | Cherkaoui M.,Ecole Mohammadia dIngenieurs | Ouassaid M.,Ecole Nationale des science Appliquees
Journal of Electrical Engineering and Technology | Year: 2014

Induction motors are critical components in industrial processes since their failure usually lead to an unexpected interruption at the industrial plant. The studies of induction motor behavior during abnormal conditions and the possibility to diagnose different types of faults have been a challenging topic for many electrical machine researchers. In this regard, an efficient and new method to detect the induction motor-fault may be the application of the Time Synchronous Averaging (TSA) to the stator current Park's Vector. The aim of this paper is to present a methodology by which defects in a three-phase wound rotor induction motor can be diagnosed. By exploiting the cyclostationarity characteristics of electrical signals, the TSA method is applied to the stator current Park's Vector, allowing the monitoring of the induction motor operation. Simulation and experimental results are presented in order to show the effectiveness of the proposed method. The obtained results are largely satisfactory, indicating a promising industrial application of the hybrid Park's Vector-TSA approach.


Najib K.,Ecole Nationale de lIndustrie Minerale | Rosier C.,University of Lille Nord de France | Rosier C.,French National Center for Scientific Research
Mathematics and Computers in Simulation | Year: 2011

We studied a sharp interface model issuing from a seawater intrusion problem in a confined aquifer. This model consists in a coupled system of an elliptic and a de-generate parabolic equation. The global in time existence is obtained in using Schauder theorem combined with parabolic regularization. We establish a priori estimations for the P1 finite element method applied to this problem. Finally, we propose numerical simulations in easy examples. © 2010 IMACS.


Alvaro J.J.,CSIC - National Institute of Aerospace Technology | Benziane F.,Ecole Nationale de lIndustrie Minerale | Thomas R.,Council for Geoscience | Walsh G.J.,U.S. Geological Survey | Yazidi A.,Council for Geoscience
Journal of African Earth Sciences | Year: 2014

In the last two decades, great progress has been made in the geochronological, chrono- and chemostratigraphic control of the Neoproterozoic and Cambrian from the Anti-Atlas Ranges and the Ouzellagh promontory (High Atlas). As a result, the Neoproterozoic is lithostratigraphically subdivided into: (i) the Lkest-Taghdout Group (broadly interpreted at c. 800-690. Ma) representative of rift-to-passive margin conditions on the northern West African craton; (ii) the Iriri (c. 760-740. Ma), Bou Azzer (c. 762-697. Ma) and Saghro (c. 760?-610. Ma) groups, the overlying Anezi, Bou Salda, Dadès and Tiddiline formations localized in fault-grabens, and the Ouarzazate Supergroup (c. 615-548. Ma), which form a succession of volcanosedimentary complexes recording the onset of the Pan-African orogeny and its aftermath; and (iii) the Taroudant (the Ediacaran-Cambrian boundary lying in the Tifnout Member of the Adoudou Formation), Tata, Feijas Internes and Tabanite groups that have recorded development of the late Ediacaran-Cambrian Atlas Rift. Recent discussions of Moroccan strata to select new global GSSPs by the International Subcommissions on Ediacaran and Cambrian Stratigraphy have raised the stratigraphic interest in this region. A revised and updated stratigraphic framework is proposed here to assist the tasks of both subcommissions and to fuel future discussions focused on different geological aspects of the Neoproterozoic-Cambrian time span. © 2014 Elsevier Ltd.

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