Vibration research on winding faults of induction motor based on experiment modal analysis method

By the experiment modal research for rotor winding faults of induction motors, the electric motor fault diagnosis by means of vibration mode analysis is explored. Motor (the model is Y2-90S-4 in China), which is given an artificial rotor bar broken, is analyzed to study the difference of motor vibration mode under fault condition and normal condition respectively. By the experiment modal analysis, it is noticed that, when running at load situation, there would be some special frequency components in the vibration spectrum of the rotor winding fault motor. Particularly, the amplitudes of second-order and third- order modal frequency components would have a sharp increase along with the deterioration of motor fault condition. A new idea that the amplitude ratio of second-order (or third-order) modal frequency component to first-order modal frequency component can be used as characteristic quantity of rotor winding faults of induction motors is proposed. In this paper, the variation of vibration spectrum is used to diagnose rotor winding faults of induction motor.