Finite Element Analysis of Switched Reluctance Generator under Fault Condition Oriented Towards Diagnosis of Eccentricity Fault

In this paper, a novel two phase double layer switched reluctance generator (DLSRG) under static eccentricity fault is introduced and analyzed. The proposed generator consists of two magnetically independent stator and rotor layers. There is a stationary reel, which has the field coils wrapped around it and is placed between the two-stator sets. This paper then continues with modeling this generator in the field assisted mode for healthy condition as well as motor with static rotor eccentricity utilizing three-dimensional finite element analysis (3-D FEA). The results of the numerical analysis for a (4/2)x2 DLSRG including flux linkages, mutual inductances per phase in each layer and radial force for various eccentric generator conditions by considering the end effects and axial fringing fields for simulating reliable model are obtained and compared. Consequently, Fourier analysis is carried out to study the variations of mutual inductance as a diagnosis index. The obtained results present useful information as good candidates for fault indicators as well as the amount of eccentricity fault and the direction of fault occurrence.