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Jelassi S.,Laboratoire Systemes Electrotechniques et Environnement LSEE | Jelassi S.,University of Artois | Jelassi S.,University Paris Grand Ouest | Romary R.,Laboratoire Systemes Electrotechniques et Environnement LSEE | And 3 more authors.
Progress In Electromagnetics Research B | Year: 2013

The goal of this paper is to present a semi analytical method which makes it possible the calculation of the dynamic iron losses in a three phase induction machine taking the slotting e®ect into account. The particularity of this method is that it allows the distinction of the stator and the rotor slot openings contribution in the dynamic and, consequently, in the total iron losses. This analytical study shows that a convenient choice of the stator and the rotor slot openings leads to an iron loss reduciton, due to the cancellation of particular flux density slotting harmonics. Theoretical results are confirmed numerically. Source


Pusca R.,Laboratoire Systemes Electrotechniques et Environnement LSEE | Pusca R.,University of Artois | Romary R.,Laboratoire Systemes Electrotechniques et Environnement LSEE | Romary R.,University of Artois | And 4 more authors.
Progress In Electromagnetics Research B | Year: 2013

This paper deals with the finite element analysis and experimental study concerning the influence of the broken bar and rotor dynamic eccentricity faults on the magnetic field outside a squirrel-cage induction motor. The spatial distribution of the magnetic field, the time variation of the magnetic flux density at a point outside the machine and the time variation of the electromotive force delivered by a coil sensor are evaluated based on the finite element models of the healthy and faulty states of the motor. The increase of amplitude from the healthy to the faulty states of some low frequency harmonics measured in the near-magnetic field is emphasized. For broken bar fault, the increase of the amplitudes of specific harmonics of the coil sensor electromotive force, with frequency lower than 25 Hz, is experimentally confirmed. Source

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