Broken bar detection in induction motors using current and flux spectral analysis

Abstract

Spectrum analysis of the stator current is commonly used for detecting broken rotor bar faults in induction motors. In this paper we examine the practicality of estimating the number of broken bars using stator current and axial leakage flux measurements. The work is based on experimental current and flux measurements taken from induction motors as the number of broken rotor bars is progressively increased. The test results are compared with theoretical predictions and empirical results from other researchers. The effect of partial load operation is also examined.