On the Rotor Bar Faults Detection in Induction Machines

The monitoring of the condition of electrical machines can significantly reduce the costs of maintenance by allowing the early detection of faults, which could be expensive to repair. It is very advantageous to implement time and money saving condition based maintenance rather than periodic or failure based maintenance. In this paper some results on detecting broken rotor bars in induction motors are presented. If there is any broken bar in the rotor it will directly affect the induced voltages in the stator windings and the waveform of the stator currents. Therefore the spectrum analysis of the line current (motor current signature analysis) is one of the best non-intrusive methods to be applied.