-Mechanical imbalances are common mechanical faults in induction motors. Vibration monitoring techniques have been widely used for the diagnosis of mechanical faults in induction motors, but electrical detection methods have been preferred in recent years. For many years, researchers have concentrated on the Motor Current Signature Analysis (MCSA). This paper examines the effect of mechanical imbalances to induction machine electrical parameters. Instantaneous Power Signature Analysis (IPSA) technique used to detect these faults. In the paper, a full analysis of the proposed technique is presented, and experimental results for healthy and faulty motors have been shown and discussed.
ÖZETÜç fazlı asenkron motorlarda herhangi bir arıza durumunda veya dengesiz kaynakla beslendiklerinde çekilen güçte şebeke frekansından farklı frekanslarda birçok sinüsoidal bileşen ortaya çıkmaktadır. Bu bileşenlerin genliği ve frekansı, oluşan arızalar ve derecesi hakkında bilgi verir. Kırık rotor çubuğu arızalarında özellikle şebeke frekansının iki katı frekansın her iki yanında kaymaya bağlı olarak bileşenlerin belirgin olarak arttığı teorik analizler sonucunda görülmüştür. Geliştirilen kırık rotor çubuğu arızası tespit yöntemi motorun çektiği üç fazlı ani güçteki 90-110 Hz frekans aralığındaki bileşenlerin enerji yoğunluğu değişimi temeline dayanmaktadır. Yapılan deneysel çalışmalarla yeni geliştirilen arıza tespit yönteminin diğer yöntemlerden daha güvenilir ve etkin çalıştığı görülmüştür.Anahtar Kelimeler: Asenkron motorlar, kırık rotor çubuğu arızası, motor ani gücü
A POWER BASED ALGORITHM DESIGN FOR DETECTION OF BROKEN ROTOR BARS FAULTS IN THREE PHASE INDUCTION MOTORS ABSTRACTMany sinusoidal components different from power system frequency in instantaneous power occur in three phase induction motors during faults and unbalanced conditions. The amplitude and frequency of these components give an idea about faults and their level. Theoretical analysis indicates that side band components that changes with slip around twice of the power system frequency occur during broken rotor bars faults. The new detection algorithm that introduced is based on power spectral density changes between 90-110 Hz frequency band in three phase instantaneous power. Experimental results have demonstrated that the new algorithm detects the faults more reliable and effective than the other methods.
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