Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Investigation into effect of mixed air gap eccentricity on dq components of currents in induction motor(2011) Rajalakshmi Samaga, R.; Vittal, K.P.dq components of currents are extensively used in the controller applications of industrial drives as they are dc quantities. In this paper, it is shown that these components will no longer remain as dc quantities, if they are extracted from the induction motor suffering from mixed air gap eccentricity. A dynamic model of an induction motor suffering from mixed air gap eccentricity is developed and simulated to show the presence of eccentricity characteristic harmonics in dq components of the stator currents in synchronous reference frame. In this paper, it is also shown that the frequency analysis of dq currents helps in the detection of air gap non uniformity in the machine. The results obtained by modeling and simulation are also validated experimentally. © 2011 IEEE.Item Inclined mixed air gap eccentricity detection method for an induction motor(IEEE Computer Society, 2014) Rajalakshmi Samaga, B.L.; Vittal, K.P.Significant number of research articles on axial uniform mixed air gap eccentricity detection methods in three phase squirrel cage induction motor are reported in literature. Most often, machines suffer from non uniform axial air gap eccentricity. In this paper, a study conducted on a three phase squirrel cage induction motor suffering from inclined mixed air gap eccentricity is presented and a new parameter is introduced to detect the inclined eccentricity fault. Experiments were conducted on 3 phase squirrel cage induction motor to show the impact of inclined mixed air gap eccentricity on dq components of stator currents. To validate the experimental results, mathematical expressions and modeling and simulation results are presented. The paper concludes with a note that an eccentricity detection unit with dq components of stator currents in synchronous reference frame as detection parameters can be embedded in the controller circuit to monitor the health of the machine. © 2014 IEEE.