ANALYSIS OF ROTOR FAULTS OF INDUCTIN MOTORS

Öz

The identification of rotor faults and their effects on induction motors have been a popular research area in recent years. The rotor faults are identified by observing the stator current, torque, flux, and flux density of the motor. In this study, the rotor faults (broken rotor bars) are modelled by using Ansoft/Maxwell simulation tool. The modelling was conducted in both two dimension (2D) and three dimension (3D). In 2D modelling, stator current, electromagnetic torque, and winding flux were observed both in time domain and frequency domain by using Finite Element Analysis. In addition, the flux distribution and flux density were also observed. In 3D modelling, a healthy motor is modelled along with a motor with rotor faults to observe magnetic flux density. The results of modelling and simulation show that Ansoft/Maxwell simulation tool can be successfully used for detection of the rotor faults of induction motors for educational purposes.

Anahtar Kelimeler

• Induction motor,rotor bar fault,broken rotor bars,Finite Element Method

ASENKRON MOTOR ROTOR ARIZALARININ ANALİZİ

Öz

Asenkron motorların rotor çubuklarında meydana gelen arızaların bir son yıllarda popüler bir araştırma konusu haline gelmiştir. Rotor arızaları, motorun şebekeden çektiği akım, moment, akı dağılım, akı yoğunluğu, gibi parametreler izlenerek tespit edilmeye çalışılır. Bu çalışmada, üç fazlı, dört kutuplu, sincap kafesli bir asenkron motorun rotor çubuklarında meydana gelen arızalar (kırık rotor çubukları) Ansoft/Maxwell yazılımı ile modellenmiştir. Modelleme iki ve üç boyutlu olarak gerçekleştirilmiştir. İki boyutlu modellemede, stator akımı, elektromanyetik moment ve stator sargı akısı sinyalleri hem zaman alanında hem de frekans alanında incelenmiştir. İki boyutlu modellemede sonlu elemanlar yöntemi kullanılarak manyetik akı yoğunluğu ve akı çizgileri de incelenmiştir. Üç boyutlu modellemede ise sağlam ve arızalı (rotorlu) motor sonlu elemanlar yöntemi modellenerek manyetik akı yoğunluğu incelenmiştir. Elde edilen sonuçlar Ansoft/Maxwell yazılımının asenkron motorların arızalarının modellenmesinde eğitim amaçlı olarak kullanılabileceğini göstermektedir.

Anahtar Kelimeler

• Asenkron motor,rotor çubuğu arızası,kırık rotor çubukları,sonlu elemanlar yöntemi

Kaynakça

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