Induction motor vibration diagnostics with the use of stator current analysis

In this paper, a non-traditional approach for induction motor mechanical fault detection is proposed. The possibility of the extension of stator current demodulation methods will be evaluated experimentally. So far, demodulation methods were used almost only for induction motor fault diagnostic. This novel approach is based on the usage the same demodulation methods for other purposes. Two areas of interest are described: the detection of unbalance connected to the induction motor shaft and bearing fault detection. Accelerometers are usually the sensor of choice for this application. The following work compares the traditional methods, which are using accelerometers as sensors, with the results obtained by induction motor stator current analysis.