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Observer-based fault diagnosis and field oriented fault tolerant control of induction motor with stator inter-turn fault

100%

Toumi D. , Boucherti M. S. , Tadjine M.

tom Vol. 61, nr 2

165-188

This paper describes a fault-tolerant controller (FTC) of induction motor (IM) with inter-turn short circuit in stator phase winding. The fault-tolerant controller is based on the indirect rotor field oriented control (IRFOC) and an observer to estimate the motor states, the amount of turns involved in short circuit and the current in the short circuit. The proposed fault controller switches between the control of the two components of measured stator current in the synchronously rotating reference frame and the control of the two components of estimated current in the case of faulty condition when the estimated current in the short circuit is not destructive of motor winding. This technique is used to eliminate the speed and the rotor flux harmonics and to assure the decoupling between the rotor flux and torque controls. The results of the simulation for controlling the speed and rotor flux of the IM demonstrate the applicability of the proposed FTC.

The effect of closed loop control on diagnostic indices in different faults of squirrel cage induction motor

80%

Bouabid N. , Moussa M.-A. , Maouche Y. , Khezzar A.

Archives of Electrical Engineering

2021

tom Vol. 70, nr 4

943--958

The aim of this work is to study the influence of closed loop control on diagnostic indices of both broken bar and mixed air-gap eccentricity fault indices of the squirrel cage induction motor drive. The present work is focused on the direct stator current isd signal analysis, which is independent of torque load when the induction motor is controlled by an indirect control field. The fault signatures are on the line extracted from the direct stator current signal using the discrete Fourier transformation (DFT). The formula of the measured direct stator current at both conditions is determined by the transfer function of the current loop. The obtained results show that the current loop corresponds to a low pass filter and can reduce the magnitude of diagnostic indicators which lead to wrong evaluation of the fault. Simulation and experiments were carried out in order to confirm the theoretical analysis.

Ewolucyjny dobór pobudzenia do diagnozowania uszkodzeń w układach analogowych

80%

Korzybski M. , Ossowski M.

tom R. 87, nr 10

167-170

Praca poświęcona jest metodzie dobierania częstotliwości prostokątnego pobudzenia przeznaczonego do diagnozowania uszkodzeń parametrycznych i katastroficznych w obwodach analogowych. Wynikiem stosunkowo dużego kosztu obliczeniowego oceny przydatności diagnostycznej każdej częstotliwości zastosowany został algorytm symulowanego wyżarzania, znacznie oszczędniejszy od algorytmu pełnego przeglądu przestrzeni rozwiązań. Opisane przykłady potwierdzają skuteczność prezentowanej metody.

The paper is devoted to the algorithm for the selection of the frequency of the rectangular input signal used in the parametric and catastrophic fault diagnosis in analog circuits. The calculation of frequency adjustment is very time consuming, so the simulated annealing algorithm is applied for the optimization of the stimuli frequency. The numerical examples confirm the effectiveness of the proposed method.