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Home / 2025 issue 6 / Justification of the possibility to diagnose an inter-turn short circuit in the winding of an asynchronous electric motor using thermal imaging

Justification of the possibility to diagnose an inter-turn short circuit in the winding of an asynchronous electric motor using thermal imaging

P.V. Yakovlev, I.N. Sulynenkov

Vestnik IGEU, 2025 issue 6, pp. 43—50

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Abstract in English: 

Background. An analysis of asynchronous electric motor defects shows that interturn short circuits in the stator windings are one of the main causes of their failure. Existing diagnostic systems to detect this defect primarily require shutting down the equipment or disassembling the electric motor for detection of defects of the windings. Thermal imaging is currently used as an operational monitoring method, but there is no method to detect interturn short circuits at their initial stage, when localized heat generation is relatively low. Therefore, it is relevant to study localized surface temperature anomalies that occur at the initial stage of interturn short circuits in the stator winding, to justify their reliable detection using thermal imaging, to determine the required thermal imager sensitivity, and to develop recommendations on inspection.

Materials and methods. The authors have used a method of numerical modeling of heat exchange with verification of the results using existing thermograms to determine the mechanism and patterns of formation of the temperature field on the surface of an asynchronous electric motor and to identify interturn short circuits using thermal imaging control.

Results. Patterns of the formation of temperature fields and temperature anomalies on the surface of an asynchronous electric motor housing during interturn short circuits in the stator winding have been identified. The authors have proposed a method to detect and localize interturn short circuits in the stator winding by analyzing the temperature field of a thermogram and assessing the amount of heat generated in the winding, enabling early detection of the defect.

Conclusions. The proposed method to conduct thermal imaging of an asynchronous electric motor and analyze the resulting thermogram can be used for early detection of interturn short circuits in the motor stator. It allows us significantly reduce labor costs for troubleshooting electric motors and, in combination with other existing diagnostic methods, effectively and timely plan maintenance of power equipment and increase its energy efficiency.

 

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Key words in Russian: 
асинхронный электродвигатель, межвитковое короткое замыкание, тепловизионная съемка, численное моделирование, температурное поле
Key words in English: 
asynchronous electric motor, interturn short circuit, thermal imaging, numerical modeling, temperature field
The DOI index: 
10.17588/2072-2672.2025.6.043-050
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