Affiliations: [a] Department of Electrical and Computer Engineering,
Shahid Beheshti University, G.C., Tehran, Iran | [b] Laboratoire d'Acoustique de l'Universite du Maine, UMR
CNRS 6613, Le Mans, France
Abstract: The magnetic characteristics of a Switched Reluctance Motor (SRM) in
normal and abnormal conditions are important in performance prediction and
verification of the motor. In this paper, a novel view of air gap magnetic
field analysis of SRM under rotor misalignment is presented. This analysis is
based on a three-dimensional finite element method (FEM) to provide the precise
fault diagnosis. This method is used to simulate reliable and precise model by
considering the end effects as well as axial fringing effects. The FE analysis
are performed to obtain the static magnetic characteristics of SRM including
flux linkages, terminal inductance and static torque profile under different
rotor positions for varying degree of misalignments. To do so, Fourier analysis
is carried out to study the variations of diagnosis index. Inductance waveforms
were analyzed by FFT, and the concept of relative spectral coefficient from the
FFT analysis is given as a fault diagnosis index, and its sensitivity to SRM
misalignment fault is shown under different conditions. The obtained results
present useful information with regard to the detection as well as the amount
of misalignment fault. To the best knowledge of the authors, such an analysis
has not been carried out previously.
Keywords: Misalignment, axial eccentricity fault, non-uniform air gap, finite element method, fault diagnosis, switched reluctance motor
