The Diagnostics of Induction Motor Broken Rotor Bars based on the Electromotive Force Analysis
Researchers succeeded in searching for efficient methods of IM diagnostics that are most suitable for particular conditions and modes of equipment operation. There are different methods for diagnostics of induction motor broke rotor bars. However, the analysis of conventional diagnostics methods revealed that most of them require the removal of the induction motor from the operation process and its disassembling. Presently, such methods of IM broken rotor bars diagnostics in operation modes such as methods of currents spectral analysis, the analysis of zero-phase sequence voltages, and the analysis of external magnetic field parameters are known. Nevertheless, these methods do not provide satisfactory results during diagnostics under a no-load condition. This is because they do not consider that the low-quality voltage of the supply network and the fluctuation of load level influence the diagnostic results. Besides, the results of the Fourier transform of current signals do not allow for unambiguous identification of the number and relative position of IM broken rotor bars. Hence, developing the method for diagnostics of IM broken rotor bars is a topical scientific and applied problem.
A method for diagnostics of IM broken rotor bars based on the analysis of electromotive force (EMF) in the stator windings is presented in the monograph. The circuit mathematical models and those related to the final element method have been developed to research IM as a diagnostics object. The efficiency of using the wavelet analysis of the EMF signal in the stator windings under the IM self-running-out condition has been demonstrated. In addition, a method for EMF signal decomposition using reverse z-transform theory has been proposed to improve the reliability of damaged diagnostics.
The presented monograph contains theoretical and experimental research that made it possible to solve the topical scientific problem of improving the efficiency of IM broken rotor bars using the signal of electromotive force wavelet analysis in the stator windings under the motor self-running-out condition. (Imprint: Nova).
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