Abstract
This paper presents some considerations regarding the application of the stator zero-sequence current component (ZSC) in the fault detection of cage induction machines, including the effects of magnetic core saturation. Faults such as rotor cage asymmetry and static, dynamic, and mixed eccentricity were considered. The research started by developing a harmonic motor model, which allowed us to obtain a voltage equation for the zero-sequence current component. The equation allowed us to extract formulas of typical frequencies for particular fault types. Next, in order to verify the effectiveness of ZSC in induction motor fault diagnosis, finite element calculations and laboratory tests were carried out for the previously mentioned faults for delta and wye connections with neutral wire stator winding configurations.
Highlights
This paper is a continuation of the research presented in [1] regarding the application of magnetic core saturation effects in induction motor diagnosis
Most failure cases cancan be be diagnosed by other methods discussed in the the cited literature, in particular by examining the stator current spectrum (MCSA)
Forslots three cases, One can see that the core saturation-related harmonic of the frequency equal to the triple supply fault, and mixed eccentricity cases, similarities to the zero-sequence voltage component (ZSV) were frequency is dominant in both ZSV and zero-sequence current component (ZSC) signals [10]
Summary
This paper is a continuation of the research presented in [1] regarding the application of magnetic core saturation effects in induction motor diagnosis. Research on the application of the zero-sequence voltage component (ZSV) in the detection of rotor cage faults and eccentricity was undertaken This method can be applied to star connected induction motors. Such modeling method was the background for determining spectrum of ZSV and ZSC characteristic for damages of the cage and three types of eccentric rotor position: static, dynamic, and mixed This was applied in [10], but without influence of the machine core slotting, and was used in the mentioned paper [1]. The studies presented in this paper start from analysis of the mathematical model of the squirrel cage induction motor in order to determine the characteristic spectrum of ZSC for the considered failures, despite the fact that the model formulated in this way has the necessary simplifications.
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