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Mathematical modeling is a basic way to simulate electric machines under various faulty conditions because it is to dangerous and/or to expensive to recognize properties of faulty machines by tests in the field or even on specialized test beds. Nowadays, signature analysis of measurable currents of machine windings is the most permissible way to characterize and to compare various faulty conditions...
A method is here presented that allows the diagnosis of broken rotor bars in time varying operations with simple post processing of input currents. Extensive simulations are presented to validate the proposed approach for open loop and closed loop induction machines. A diagnostic index is presented also, that is quite robust versus load and inertia variations.
The aim of the paper is to show several case histories regarding the diagnosis of rotor asymmetries and other faults in large induction motors. These are motors under real operation in power generating installations. Two different approaches are used for the diagnosis of the machine condition. Both of them are based on the study of the startup transient of the machine and the extraction of characteristic...
This paper presents a diagnostic method of the eccentricity of the rotor of the cage induction motor, using a diagnostic inference block, based on ANFIS (adaptive-network-based fuzzy inference system). A construction and principle of work of the diagnostic inference block for a selected induction motor will be provided, in order to assess the eccentricity of the rotor. The input data for the proposed...
Diagnostic method of electrical faults in switched reluctance motors (SRM) based on current harmonics analysis is presented in this paper. The classification of electrical faults in SRM's has been discussed, simulation model and laboratory setup presented. For the SRM motor of 6/4 design the conclusions drawn from the tests conducted both in the simulated and laboratory conditions for regular operation...
The aim of this paper is to monitor the bearing damage developing by vibration signals measured from induction motors subjected to bearing fluting aging. The vibration signals taken from the accelerometers were analyzed by principal component analysis (PCA) and computed their spectra to denote the progressing of the aging. Meanwhile, using the principal component (PC) results, the entropy values based...
In the paper, a new approach on the model of the broken rotor bars and rotor rings of the induction generators used in micro hydro power plants is proposed. Any physical asymmetry of the rotor, as a broken bar or a broken ring directly affects the stator current and the machine torque by distorting the corresponding waveforms. The analysis of simulation results and experimental data obtained for different...
This paper deals with the tracking and the prediction of the evolution of the system operation. The aim is to define a forecast of future operating state of the process by using the previous state. First of all, a signature is determined in order to monitor the evolution of different operating modes. For this purpose, on the example of an induction machine, diagnostic features are extracted from current...
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