Current measurements and analysis for induction motor diagnostics

• Autorzy: Swędrowski L.
• Języki publikacji: EN

Abstrakty

EN

Additional motor vibrations are the result of a faulty bearing. They are reflected in the harmonic content of stator currents. The object of the investigation presented in the paper are measurements related to diagnostics of induction motors, especially damages caused to bearings. Due to the fact that the amplitude of the network voltage basic harmonic in the current spectrum is high in comparison with components responsible for damages of bearings, preliminary elimination of this component from the analog current signal has been proposed. The problem with interpretation of diagnostic measurements in present systems is the difference between measurement results of characteristic frequencies and theoretical calculations. In the proposed measurement system this problem was solved in such a way that the value of the angular speed and of the supply frequency is calculated on the basis of appropriate components in the very same current spectrum that is further used in the search for diagnostic components. The paper presents also the measuring system and provides results of the investigations carried out on a motor encumbered with a specially prepared defect.

Słowa kluczowe

EN

induction motors; current measurement; diagnostics; roller bearing; spectral analysis

• Wydawca: Komitet Metrologii i Aparatury Naukowej PAN
• Czasopismo: Metrology and Measurement Systems
• Rocznik: 2010
• Tom: Vol. 17, nr 1
• Strony: 87--94
• Opis fizyczny: Bibliogr. 7 poz., rys., wykr.

Twórcy

autor

Swędrowski L.

• Gdansk University of Technology, Faculty of Electrical and Control Engineering, G. Narutowicza 11/12, 80-952 Gdańsk, Poland,

Bibliografia

• [1] R.R. Schoen, T.G. Habetler, F. Karman, R.G. Bartheld: “Motor bearing damage detection using stator current monitoring”. IEEE Transactions on Industry Applications, vol. 31, 1995, pp. 1274-1279.
• [2] B. Yazici, G.B. Kliman: “An adaptive statistical time-frequency method for detection of broken bars and bearing faults in motors using stator current”. IEEE Transactions on Industry Applications, vol. 35, no. 2, 1999, pp. 442-452.
• [3] G.B. Kliman, J. Stein: “Induction motor fault detection via passive current monitoring”. Proc. ICEM, MIT, Cambridge USA, 1990, pp. 13-17.
• [4] H. Calis, P.J. Unsworth: “Fault diagnosis in induction motors by motor current signal analysis”. Proc. SDEMPED’ 99, pp. 237-241.
• [5] R. R. Schoen, B. Lin, T.G. Habetler, J.H. Schlag, S. Farag: “An unsupervised, on line system for induction motor fault detection using stator current monitoring”. Conf. Rec. 29th IEEE-IAS Annu. Meeting. Oct., 1994, pp. 117-122.
• [6] J. Rusek, L. Swędrowski: “Effect of the damage of bearing on current spectrum of induction machines”. Proc. XXXIX International Symposium on Electrical Machines SME 200, Gdansk, Poland, 9-11 Jun. 2003. CD ROM.
• [7] L. Swędrowski: “Diagnostics of induction motors by means of current supplying measurements. Machine Engineering”. Editoral Institution of the Wroclaw Board of Federation of Technical Societes NOT, vol. 3, no. 1-2, Wrocław, Poland, 2003.