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Method for diagnosing breakage of rods of rotors short-circuited winding of induction motor

S.V. Derkachev

Vestnik IGEU, 2025 issue 2, pp. 28—33

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Abstract in English: 

Background. Induction motors have found wide application as electric drives of the main equipment of power, metallurgical, mechanical and thermal power equipment due to their simplicity of manufacture and maintenance. However, their application as electric drives of the main equipment at industrial enterprises requires the development of methods for monitoring and diagnosing their actual condition based on operating mode parameters to ensure their trouble-free operation and timely removal for preventive maintenance. Therefore, the objective of the work is relevant. The aim is to develop a method to diagnose the breakage of one or several rods of the short-circuited rotor winding of an induction motor using the Fourier transform of the stator currents according to the parameters of the steady-state operating mode.

Materials and methods. To achieve this purpose, computer modeling methods have been used, based on mathematical models of electrical network elements presented using systems of differential equations.

Results. A diagnostic criterion has been established. It allows one to determine a breaking down in the rods of a short-circuited rotor winding of an induction motor, based on the use of the Fourier transform of stator currents measured in real time and it allows one to detect magnetic flux oscillations caused by a break in the rods in the rotor winding, based on a change of the value of the phase sum of the measured stator phase currents. It has been established that the use of the proposed criterion to diagnose the breakage of rods has a sufficiently high accuracy, since it allows one to determine not only the breakage of several rods of the short-circuited winding of the rotor of an induction motor, but also the breakage of only one rod.

Conclusions. The proposed criterion to diagnose the condition of the short-circuited rotor winding allows one to detect the presence of broken rods in the short-circuited rotor winding without its decommissioning and disassembly. It can be used in continuous monitoring systems for an induction motor.

References in English: 

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Key words in Russian: 
асинхронный электрический двигатель, короткозамкнутый ротор, обрыв стержней ротора, преобразование Фурье
Key words in English: 
induction electric motors, squirrel-cage rotor, rotor bar breakage, Fourier transform
The DOI index: 
10.17588/2072-2672.2025.2.028-033
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