A New Artificial Neural Network Based Failure Determination System For Electric Motors

Abstract

Abstract A new measurement system was developed for determination of failures and defining the level of failure that may occur in bearings and rotor bearings or in foot of motor in single phase capacitor start motor. In system, the vibratory operation of the motor is provided by connecting different screws on the motor’s rotor mounted flywheel or by gradually removing the nut bolts of motor foot. The VB3 vibration sensor outputs were recorded to the computer. The changing characteristics of sensor output for each experiment had more than one frequency component; therefore, FFT was performed for determining such components. It was observed that the frequency and amplitude values of first 5 harmonics could be used for determining the presence, type and level of failure but there was a nonlinear relation between each other. 2 different ANN customized separately were developed for determining the type and rate of the failure of motor. 80%, 10% and 10% of available data were reserved for training, testing and verification respectively and the ANN was trained. Accuracy degree for the ANN in the estimations following the training stage was calculated as R = 0.97-0.98. Furthermore, the results of ANN was compared with the results obtained using Sequential Minimal Optimization (SMO), Naive Bayes (NB) and J48 algorithms; and it was determined that the accuracy degree of ANN was higher.