Analysis of induction motor faults by means of monitoring the current and magnetic flux density spectrums

In this paper the analysis of presence of faults in squirrel-cage induction motor using motor current signature analysis as well as monitoring of behavior of stray flux is presented. There were measured 6-pole motors with static, dynamic and mixed eccentricity. Measurement and analyzed results were compared with data obtained from the simulation and measurement of the 4-pole induction motor. The behavior of the sidebands of principal slot harmonics were examined. The illustration of effectiveness and practical benefits of use of these types of diagnosis is presented in the form of the graphs and tables.