On -Line Stator Winding Inter -Turn Short -Circuits Detection in Induction Motors Using Recursive Levenberg -Marquardt Algorithm

Abstract

Within the framework of the diagnosis of the stator windings faults, the authors propose in this paper a recursive diagnosis method for on-line detection and location of an inter-turn short-circuit by parameters identification. This approach based on the Recursive Levenberg-Marquardt (RLM) algorithm is used for the minimization of the objective function represented by the quadratic criterion obtained by the difference between the real outputs and their estimations. Tests and validations of failure detection by parameter identification require a model suited for fault modelling. For this purpose, a faulty induction motor model is proposed. Electric parameters of this model as well as fault parameters are estimated by RLM adaptive algorithm through an output-error technique. Because the parameters values of this model present magnitude order very different, the normalization of these parameters is proposed in order to obtain the sensitivity functions with the same magnitude order. The estimation results, which used simulated data, are presented to show the effectiveness and the advantage of the proposed approach for use in real-time stator faults diagnosis.

Incipient short circuit fault impact on service continuity of an electric vehicle propelled by dual induction motors structure

“…For a faulty model, different research works of mathematical models regarding inter-turn shortcircuit faults in the stator of an induction motors can be found in literature [12][13][14]. As the need for greater accuracy in induction motor modeling, important physical characteristics have to be taken into account.…”

“…The differential action assured by dual motors operating at different speed enables the wheels to be driven at different speeds when cornering the outer wheel covering a greater distance than the inner wheel. Then the propulsion control structure placed at the rear wheels propels electrically the vehicle and assures the required differential speed Ω diff according to [15]: (13) where:…”

Least square support vectors machines approach to diagnosis of stator winding short circuit fault in induction motor

“…In order to take into account the presence of windings of inter-turn short-circuits in the stator of an IM, an original model has been proposed in reference [11]. Figure 1 shows the defective model of the stator in the Park axes with an overall leak reported to the stator.…”

“…In addition to solve nonlinear regression it is enough to change the inner product of (x i ), (y i ) (12) by a kernel function and the ijth element of matrix K equals to (11) This means as result a nonlinear regression function:…”

“…The second technique is related to knowledge-based approach [5], [7], [8]. The third class is based on state or parameters estimation and implies the use of mathematical models of the studied system [9], [10], [11], [12].…”