Abstract-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.
PurposeThis paper aims to deal with the 3D finite element analysis of metallic sheets heating in translating motion through the air gap of an inductor of transverse flux type.Design/methodology/approachThis study presents two finite element based motion coupling techniques used to analyze the transient temperature field of moving metallic sheets heated by induction.FindingsThe numerical results obtained by the two different magneto‐thermal – translating motion coupling techniques proposed in this paper are in good agreement with each other being validated also by experimental measurements.Practical implicationsThe proposed numerical techniques can be used for the design and optimization of transverse flux induction heating systems.Originality/valueAn original solution to improve the transversal thermal profile of the metallic sheet based on the magnetic shielding is proposed and analyzed. The numerical results of the thermal field are validated by experimental measurements.
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