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Mixed eccentricity fault diagnosis in saturated squirrel cage induction motor using instantaneous power spectrum analysis

Abdellah C., Azeddine B., Pusca R., Romary R., Lecointe J. P.

Przegląd Elektrotechniczny

2016

R. 92, nr 7

116--120

Mixed eccentricity fault is one of the most common faults occurring in squirrel cage induction motors. Several techniques have been used to detect this type of fault, such as those based on vibration, axial leakage monitoring, zero-sequence component, negative sequence current, and motor current signature analysis. However, these techniques do not take into account the effect of magnetic saturation. In this paper, Instantaneous Power Signature Analysis (IPS) technique is used to detect this kind of fault, it shows the effect of harmonic saturation on the mixed eccentricity fault diagnosis of squirrel induction motors. Both simulation and experimental results for healthy and faulty motors are shown and discussed.

Do analizy ekscentryczności silnika indukcyjnego powszechnie używa się monitorowania wibracji, rozproszenia osiowego, negatywnej sekwencji prądu I kształtu prądu. Metody te niestety nie biorą pod uwagę nasycenia magnetycznego. W artykule zaproponowano metodę IPS (analiza sygnatury prądu) analizująca nasycenie harmonicznych. Przedstawiono wyniki symulacji i eksperymentalne metody.

On-line technique for measuring thickness for three-dimensional braided composite material preforms

Wan Z., Li J.

Autex Research Journal

2005

Vol. 5, no. 4

236--246

This paper presents an automatic method that can measure the thickness of three-dimensional (3-D) braided composite preforms. The thickness of 3-D braided composite material preform is an important parameter of 3-D braided composites. With the development of 3-D braided composite technology, an automated measurement technology for thickness of braided composite preform has become an importantgoal. The objective of this paper is to present an automatic measuring system. The system we devised consisted of a computer, a proximity sensor, a pressure sensor, an analog-to-digital converter and pulse motor, etc. The measuring principle and results are discussed in the paper. The system was tested on both carbon and glass fibre preforms. We obtained very encouraging results. Experiments showed the pressure and eddy current resistance value are important parameters for measuring the thickness of 3-D braided composite material preforms. The measuring precision is higher when the pressure value ranges from 0.6kg/cm2 to 0.8kg/cm2 and the eddy current resistance is 2kW for preforms made of carbon-fibre than of other substances.