Juggrapong Treetrong. Fault quantifications of induction motor based on time frequency analysis. (). King Mongkut's University of Technology North Bangkok. Central Library. : , 2555.
Fault quantifications of induction motor based on time frequency analysis
Abstract:
The spectrum method has popularly been applied to fault detection bases on frequency analysis by observing the side band, its harmonics around the main frequencies or its other harmonics. Based on the present experiments, the spectrum method with the FFT function has the ability to distinguish the motor condition. However, the fault severity levels were not analyzed. Therefore a time-frequency analysis (or spectrogram) of the stator phase currents is proposed here. This method is expected to show the relationship between the phase current signal sand the fault levels, enabling it to detect the faults and also to indicate the fault levels. The method is tested on 3 different motor conditions: healthy, stator fault, and rotor fault motor at full load conditions. The experiments show that the proposed method can provide accurate fault prediction and fault level quantification by observing the change in the color index at specific frequencies. Hence it can be concluded that the propose method is an effective tool for motor fault analysis.