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1
Content available Diagnostics of Rotor Damages of Three-Phase Induction Motors Using Acoustic Signals and SMOFS-20-EXPANDED
Glowacz A.
Archives of Acoustics
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2016
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Vol. 41, No. 3
507--515
EN
A fault diagnostics system of three-phase induction motors was implemented. The implemented system was based on acoustic signals of three-phase induction motors. A feature extraction step was performed using SMOFS-20-EXPANDED (shortened method of frequencies selection-20-Expanded). A classification step was performed using 3 classifiers: LDA (Linear Discriminant Analysis), NBC (Naive Bayes Classifier), CT (Classification Tree). An analysis was carried out for incipient states of three-phase induction motors measured under laboratory conditions. The author measured and analysed the following states of motors: healthy motor, motor with one faulty rotor bar, motor with two faulty rotor bars, motor with faulty ring of squirrel-cage. Measured and analysed states were caused by natural degradation of parts of the machine. The efficiency of recognition of the analysed states was good. The proposed method of fault diagnostics can find application in protection of three-phase induction motors.
2
Content available remote Analyses and tests of interlamination short-circuits
Makuc D., Berlec M., Miljavec D.
Przegląd Elektrotechniczny
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2011
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R. 87, nr 3
115-118
EN
Since the interlamination short-circuits in stator cores can cause major damage to electrical machine a great emphasis is placed to detect such faults. ELCID (Electromagnetic Core Imperfection Detector) test is nowadays often used for testing of interlamination insulation in stator cores of large electrical machines. To investigate this relatively young method a laboratory model of stator core was built, which enables measurements and analyses of intentional shorl-circuits in the core. Interlamination faults were also simulated and analysed using FEM.
PL
Ponieważ zwarcia międzywarstwowe w rdzeniach stojanów mogą spowodować istotne awarie maszyn elektrycznych jest sprawą wielkiej wagi detekcja takich zwarć. Test detektorem uszkodzeń rdzeni magnetycznych jest współcześnie często używany dla testowania izolacji międzywarstwowej w rdzeniach stojana dużych maszyn elektrycznych. Do zbadania tej relatywnie nowej metody zbudowany został laboratoryjny model rdzenia stojana, który umożliwia pomiary i analizę celowych zwarć w rdzeniu. Uszkodzenia międzywarstwowe były także symulowane i analizowane za pomoca MES.
3
Content available remote An application of discrete-continuous modelling of the rotating systems for fault diagnostics
Szolc T.
Vibrations in Physical Systems
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2004
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Vol. 21
365--368
EN
In the paper coupled parametric vibration analysis of the three-bearing double span rotor-shaft system with two bladed disks has been performed by means of the analytical-numerical approach based on the discrete-continuous mechanical model. There were investigated rotor-shaft lateral vibrations coupled with its torsional-axial vibrations by the local shaft anisotropy co-operating with a bearing misalignment. For various rotational speeds a severity of the coupling effects between the mentioned kinds of vibrations was studied for several values of the bearing misalignment.
4
Content available remote Vibration fault diagnosis and site dynaminc balance of rotary
Changzheng C., Heji Y.
Vibrations in Physical Systems
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2000
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Vol. 19
78--79
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