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Analysis of operating conditions and improvement of research methods of squirrel-cage rotor induction motors

S.N. Tkachencko

Vestnik IGEU, 2025 issue 2, pp. 34—42

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Abstract in English: 

Background. At present, induction motors with a squirrel-cage rotor are the main type of AC electrical motors used in industry as an electric drive for various mechanisms and installations. To assess the performance of relay protection, automation, monitoring and diagnostics systems of induction machines, a qualitative analysis of their operating conditions is necessary. For this purpose, various approaches are used, based on experimental studies as well as on methods of mathematical simulation on a PC. However, most of the existing methods have certain drawbacks, such as the complexity of implementing a number of operating modes in real practical conditions, such as emergency short-circuit cases, the errors in mathematical simulation process, etc. Therefore, the qualitative analysis of normal, abnormal and emergency operating conditions of low- and high-voltage induction motors with squirrel-cage rotor and modernization of respective research methods is relevant.

Materials and methods. To achieve the stated goal, both experimental research methods and research methods based on mathematical simulation on a PC have been applied. A mathematical model based on full differential equations describing an induction motor has been used. The original PTC® MathCADTM software has been used as a modeling tool.

Results. The paper presents a detailed classification of normal, abnormal and emergency operating conditions of induction motors with a squirrel-cage rotor, and also considers existing approaches to study their operating modes. It is proposed to use a hybrid approach to perform a qualitative analysis, combining both experiments using digital recorders and PC mathematical simulation using a mathematical model based on full differential equations describing an induction motor. The key feature of the proposed mathematical model is an improved module for combined detection of heating temperature of stator and rotor windings based on monitoring the operating parameters. The performance of the proposed hybrid approach has been tested for 0,4 kV stator voltage induction motor.

Conclusions. The obtained results can be used for both scientific and practical purposes to carry out a qualitative analysis of operating conditions to check the operability of relay protection, automation, monitoring and diagnostics systems of low- and high-voltage induction motors with squirrel-cage rotor.

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Key words in Russian: 
асинхронный двигатель, короткозамкнутый ротор, модуль комбинированного определения температуры нагрева
Key words in English: 
induction motor, squirrel-cage rotor, module for combined heating temperature detection
The DOI index: 
10.17588/2072-2672.2025.2.034-042
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