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Öğe Closed rotor slot effect on negative sequence impedance(Ieee, 2001) Arkan, M; Kostic-Perovic, D; Unsworth, PJThis paper presents experimental results concerning the negative sequence impedance Z(n) of induction motors with different rotor slot constructions. Z(n) is used as a fault index for shorted turns in stator windings, or can be used distinguish negative sequence current due to unbalanced supply voltage from negative sequence current due to stator shorts. Although Z(n) is largely independent of speed changes, experiments show that it can vary strongly with motor loading. Results presented show that, depending on rotor slot type, negative sequence reactance can change by as much as 10% to 50%, especially in motors with closed rotor slots.Öğe Modelling and simulation of induction motors with inter-turn faults for diagnostics(Elsevier Science Sa, 2005) Arkan, M; Kostic-Perovic, D; Unsworth, PJThis paper presents two orthogonal axis models for simulation of three-phase induction motors having asymmetrical windings and inter-turn short circuits on the stator. The first model assumes that each stator phase winding has a different number of turns. To model shorted stator turns, the second model assumes phase as has two windings in series, representing the unaffected portion and the shorted portion. It uses the results of the first model to transfer phase as to qd so that shorted portion is transferred to the q axis. Simulations results from the models are in good agreement with other studies and are compared with experiment carried out on a specially wound motor with taps to allow different number of turns to be shorted. The models have been successfully used to study the transient and steady state behaviour of the induction motor with short-circuited turns, and to test stator fault diagnostic algorithms operating in real time. (c) 2005 Elsevier B.V. All rights reserved.
