Journal of Institute of Control, Robotics and Systems (제어로봇시스템학회논문지)

Institute of Control, Robotics and Systems (제어로봇시스템학회)
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Analysis of the Bearing Fault Effect on the Stator Current of an AC Induction Motor

유도전동기의 고정자 전류에 미치는 베어링 고장 영향 분석

  • Kim, Jae-Hoon (School of Electronics Engineering, Kyungpook National University) ;
  • Lee, Dong-Ik (School of Electronics Engineering, Kyungpook National University)
  • Received : 2013.05.31
  • Accepted : 2014.04.03
  • Published : 2014.06.01
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Abstract

Detection and diagnosis of incipient bearing fault in an induction motor is important for the prevention of serious motor failure. This paper presents an analysis of the effect of a faulty bearing on the stator current of an induction motor. A bearing fault leads to torque oscillations which result in phase modulation of the stator current. Since the torque oscillations cause specific frequency components at the stator current spectrum to rise sharply, the bearing fault can be detected by checking out the faultrelated frequency. In this paper, a mathematical model of the load torque oscillation caused by a bearing fault is presented. The proposed model can be used to analyze the physical phenomenon of a bearing fault in an induction motor. In order to represent the bearing fault effect, the proposed model is combined with an existing model of vector-controlled induction motors. A set of simulation results demonstrate the effectiveness of the proposed model and represent that bearing fault detection using a stator current is useful for vector-controlled induction motors.

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References

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