Communications Internationales

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/11

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    Calculation of IGBT power losses and junction temperature in inverter drive
    (IEEE, 2016) Bouzida, Ahcene; Abdelli, Radia; Ouadah, M'hamed
    Several techniques for estimating power losses in insulated-gate bipolar transistors (IGBTs), diodes and MOSFETs are known. Most of the approaches in the literature deal with PWM switching technique. In this paper presents a feasible loss model to estimate IGBT losses in a switching operation. The loss model is coupled to RC (Foster) Network using the Thermal Impedance. This paper investigates the power losses in IGBT's and associated Diodes as a function of the circuit and the temperature variation during operation. A full presentation of the electro-thermal model has been developed and simulated
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    Dynamic eccentricity fault diagnosis in induction motors using finite element method and experimental tests
    (Inder Science Online, 2017) Bouzida, Ahcene; Abdelli, Radia; Touhami, Omar; Aibeche, Abderrazak
    This paper presents the dynamic eccentricity (DE) in the squirrel cage induction machine obtained by the simulation using finite element method (FEM) and the experimental tests. Motor current signature analysis (MCSA) through the power spectral density (PSD) is used to monitor the low frequency components related to the rotor faults. In order to generalise the study, a comparison was performed between faulty machines and healthy, under different load conditions. The experimental tests show the encountered difficulties in the detection of the dynamic eccentricity under various load conditions because the spectral representation shows the existence of low frequency components for the healthy case, which are superimposed with the indicator components. These low frequency components offer an alternative way to the monitoring of eccentricity air-gap when the load is balanced
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    Static eccentricity fault modeling in permanent-magnet synchronous motors
    (IEEE, 2016) Abdelli, Radia; Bouzida, Ahcene; Touhami, Omar; Ouadah, M'hamed
    In this paper, a model based on the finite element analysis has been developed for healthy and eccentric PMSM. The proposed model is analyzed by time stepping Finite element method. The electromagnetic field distribution, air-gap magnetic flux density and the leakage inductances under healthy and eccentric rotor have been calculated. Meanwhile, the MCSA of the healthy and faulty PMSM is inspected under various static eccentricity levels