Modelling and simulation of induction motors with inter-turn faults for diagnostics

This 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.