Study of an induction motor working under stator winding inter-turn short circuit condition

Research has proven that several methods are able to detect shorted turns in the stator winding of operating motors, even in cases in which few turns are involved. One important aspect of these methods is its ability to be applied to condition-based maintenance systems; moreover it has the sensitivity to predict how far the machine is from the end of its useful life. Any information that contributes to establishing an alarm level to predict the remaining life of the motor would be very useful. This paper presents the results of a study carried out on a motor working under a turn to turn short condition. In this condition, interesting results about the behaviour of the motor are obtained and a comparison between the sensitivity of some diagnostic methods to detect shorted turns is made.