Purpose. To develop a method of decomposition of a signal of electromotive force induced in stator windings in an induction motor with rotor broken bars after disconnection of the motor from the network. Methodology. Methods of comparative analysis, mathematical modeling and forecasting were used. Findings. A mathematical model was developed using finite element method for computation of electromagnetic field in cross-section of induction motor with rotor broken bars. It was proposed to use wavelet-transform of winding electromotive force (EMF) signal in order to determine the number and mutual displacemen of rotor broken bars. A method for decomposition of electromotive force signal of induction motor stator winding to electromotive force signals of active sides of winding coils was developed using the theory of reverse z-transform. This allows one to increase accuracy of induction motors rotor broken bar diagnostics via singling out information features from electromotive force signal of one active side of winding coil We have proposed a method for calculation of electromagnetic field in the cross section of an induction motor with the use of a mathematical model based on the finite element method enabling assessment of broken rotor bars influence on generation of electromotive force in stator windings after disconnection of the motor from the network. The performed analysis of structural features of induction motors allowed us to find out that generation of electromotive force signal in stator winding elements can be influenced by such design factors as the number of pairs of poles, the circuit of connection of coil groups in the winding phase, the type of stator winding. We have proposed to use the theory of reverse z-transform to realize the method of decomposition of the signal of stator winding phase electromotive force. Originality. For the first time we have developed a method of decomposition of a signal of stator winding phase electromotive force with use of the theory of reverse z-transform. This method makes it possible to improve the reliability of diagnostics of induction motor rotor broken bars by means of singling out information features in the signal of electromotive force of one side of the coil. Practical value. We have developed a software module for automated calculation of electromagnetic field in the cross section of an induction motor.

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