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Stator current spectrum analysis of a double cage induction motor with rotor asymmetry

Tulicki Jarosław, Sobczyk Tadeusz Jan, Sułowicz Maciej

Archives of Electrical Engineering

2023

Vol. 72, nr 2

357--371

This study presents a method to directly calculate the stator current Fourier spectra in double-cage induction motors to diagnose faults in rotor cages. A circuit model is developed for this purpose, allowing the modelling of any asymmetry in the outer and inner rotor cages. The model extends the conventional model of a cage motor by considering the higher space harmonics generated by the stator windings. The asymmetry of the cages is modelled by growing the resistance of any of the rotor bars. This results in various model equations, to be solved by looking for diagnostic signals. Motor current signature analysis is typically used to diagnose cage motors based on the Fourier spectra of the stator currents during steady-state operation. This study determines these spectra for double cage motors using the harmonic balance method, omitting the transient calculations. The calculation results confirmed the sensitivity of the stator current Fourier spectra as a diagnostic signal to distinguish faults in the outer and inner cages.

Projekt przekształtnika DC/DC w topologii podwójnego mostka aktywnego (DAB) dla układu laboratoryjnego do badania baterii litowo-jonowych

Gierczyński Michał, Grzesiak Lech M., Kaszewski Arkadiusz, Bałkowiec Tomasz, Miazga Tomasz, Straś Andrzej

Przegląd Elektrotechniczny

2021

R. 97, nr 2

77--81

W artykule przedstawiono projekt przekształtnika DC/DC w topologii podwójnego mostka aktywnego. Przedstawiono specyfikę aplikacji docelowej tego przekształtnika. Wyjaśniono jego budowę oraz zasadę działania. Następnie na podstawie zależności analitycznych wyjaśniono, jak dobierać kluczowe parametry tego układu, aby spełnić wymagania określone w jego specyfikacji.

The paper presents a design of a DC/DC converter in dual active bridge topology. The characteristics of its target application have been presented. Then, the structure and operational principle have been described. Finally, based on analytical expressions it has been shown, how to choose the key system parameters, in order to meet the application requirements.

Improved algorithm for periodic steady-state analysis in nonlinear electromagnetic devices

Sobczyk T. J., Radzik M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2019

Vol. 67, nr 5

863--869

This paper presents the improved methodology for the direct calculation of steady-state periodic solutions for electromagnetic devices, as described by nonlinear differential equations, in the time domain. A novel differential operator is developed for periodic functions and the iterative algorithm determining periodic steady-state solutions in a selected set of time instants is identified. Its application to steady-state analysis is verified by an elementary example. The modified algorithm reduces the complexity of steady-state analysis, particularly for electromagnetic devices described by high-dimensional nonlinear differential equations.