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  5. Analysis of methods for determining the technical condition of asynchronous motors of electric machine frequency converters in electric supply systems of surface-to-air missile systems

Analysis of methods for determining the technical condition of asynchronous motors of electric machine frequency converters in electric supply systems of surface-to-air missile systems

H. Lahutin, O. Skyba, O. Yur'yev
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Description: Electric frequency converters provide combat operations by anti-aircraft missile units, and failure of the drive induction motor can lead to non-fulfillment of combat mission and destruction of important industrial and military facilities of the country. Due to the fact that the reliable operation of the asynchronous motor of the frequency converter depends on the performance of combat missions by anti-aircraft missile systems, information about the actual technical state of the engine is very important. When operating asynchronous motors of power supply systems of the Air Force objects, the following methods of evaluation of their technical condition can be used: acceptance and periodic tests; assessment of the technical condition by the results of the analysis of malfunctions; systems of test and functional diagnostics. Existing methods and means of diagnosing asynchronous motors used in the Armed Forces of Ukraine do not allow to fully assess their actual technical condition and, thus, prevent pos-sible malfunctions and accidents. The analysis showed that the following promising methods of diagnosing electric motors can be defined: vibroacoustic method; a method for comparing the results of measurements of engine operating signals with its mathe-matical model; Spectral analysis of Park vectors modules of current and voltage of the engine. Particularly noteworthy is the method of determining the technical state of the engine, based on the spectral analysis of the Current and Voltage Park vectors. Using this method allows to diagnose such basic malfunctions of the electric motor of the frequency converter, as: the intercon-nection circuit in the windings of the stator; breakdown of rods short-circuited rotor; insolubility of electric motor shafts and high frequency generator; damage to the rotor bearings. For the electrotechnical units, especially those involved in the joint forces operation zone, the application of this method allows the full implementation of the technology of servicing the equipment in its actual state, which ensures the minimization of emergency equipment failures due to the early detection of emerging defects and development control damages.


Keywords: asynchronous motor, electric frequency converter, power supply system of a military object, evaluation of tech-nical condition.

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Reference:
 Lahutin, H.I., Skyba, O.O. and Yuriev, O.O. (2019), “Analiz sposobiv vyznachennia tekhnichnoho stanu asynkhronnykh dvyhuniv elektromashynnykh peretvoriuvachiv chastoty v systemakh elektropostachannia zenitnykh raketnykh kompleksiv” [Analysis of methods for determining the technical condition of asynchronous motors of electric machine frequency converters in electric supply systems of surface-to-air missile systems], Scientific Works of Kharkiv National Air Force University, Vol. 2(60), pp. 133-139. https://doi.org/10.30748/zhups.2019.60.17.