Estimation of stator winding faults in induction motors using an adaptive observer scheme

Abstract

This paper addresses the subject of inter-turn short circuit estimation in the stator of an induction motor. In the paper an adaptive observer scheme is proposed. The proposed observer is capable of simultaneously estimating the speed of the motor, the amount turns involved in the short circuit and an expression of the current in the short circuit. Moreover the states of the motor are estimated, meaning that the magnetizing currents are made available even though a fault has happened in the motor. To be able to develop this observer, a model particular suitable for the chosen observer design, is also derived. The efficiency of the proposed observer is demonstrated by tests performed on a test setup with a customized designed induction motor. With this motor it is possible to simulate inter-turn short circuit faults.

Modelling and study of PM machines with inter-turn fault dynamic model–FEM model

“…Modelling and determining the parameters of the electrical machines with turn faults is the first step in the development of turn fault study and diagnosis [1,[4][5][6][7]. These models exhibit a tradeoff between simplicity and precision.…”

“…The reference frame transformation to orthogonal axis is widely applied to the asymmetrical electrical machines or for machine with fault [1,[4][5][6][7][8][9][10][11]. In [5] a transient model for induction machine with using reference frame transformation is presented.…”

“…The stator turn fault must be predicted and detected in time to avoid catastrophic failure. Different approaches are proposed for detection of inter-turn faults in electrical machines [7][8][9][10][11][12].…”

Model Based Stator Fault Detection in Induction Motors

“…It allows to detect the faulted phase, and the quantification of the number of short-circuited turns. A similar approach was presented in [7], where an adaptive observer is used to estimate the amount of short-circuited turns. However, such proposal needs three simultaneous observers, one for each motor phase.…”

Fault detection and isolation of electrical induction motors via LPV fault observers: A case study

“…The industry request for an increased reliability of these machines has stirred up a considerable industrial and academic research interest towards the development of robust and effective FDI strategies (see e.g., and references therein) for such a class of systems because they would pave the way for their fault‐tolerant control as a next goal. See for a detailed description of all classes of stator/rotor electrical and mechanical faults and for a recent comprehensive review of most used diagnostic techniques in industry.…”