Abstract
An accurate means of non-invasive condition monitoring of the popular industrial drive, three-phase squirrel-cage induction motor, can help to avoid unscheduled maintenance downtime and loss. Faults like air-gap eccentricity can exist even in a newly assembled drive and hence may co-exist with other internal defects. Despite it being a possible situation, the occurrence of simultaneous faults has seldom been studied. Therefore, there is a need for identifying fault signatures of combined fault conditions in a non-invasive manner. This paper presents a detailed model-based study on a three-phase squirrel-cage induction motor with the simultaneous existence of broken rotor-bar and air-gap mixed eccentricity faults using spectral analysis of stator current, instantaneous power, and estimated air-gap torque signals. The modelling of the machine is done using the Multiple Coupled Circuit method and modified to model the presence of the combined fault conditions. A comparative evaluation with various fault conditions and their severity is carried out by spectral analysis, and unique slip-dependent frequency components are identified in the spectra of diagnostic signals. This fault characterization is the most significant contribution of this paper.
Original language | English |
---|---|
Pages (from-to) | 345-358 |
Number of pages | 14 |
Journal | International Review on Modelling and Simulations |
Volume | 14 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2021 |
All Science Journal Classification (ASJC) codes
- Modelling and Simulation
- General Chemical Engineering
- Mechanical Engineering
- Electrical and Electronic Engineering