Diagnosis of rotor faults by fast Fourier transform using an auxiliary winding voltage

Abstract

<p>Condition monitoring and on-line detection have attracted several researchers in order to carry out an efficient diagnosis of machine failures. Therefore, the detection in early stage avoids system breakdown and reduce the maintenance cost. This paper presents a new diagnosic approach to detect the broken bars and broken end ring faults for a squirrel cage induction machine based on the fast Fourier transform analysis applied on a new signature as the voltage of an auxiliary winding. The auxiliary winding is a small coil inserted between two of the stator phases, the explicit expression of its voltage is presented. The signal is monitored in six faults cases under a different load level, the emergence of the fault frequencies changes for each kind of failure. The successfully simulation results obtained show the effectiveness of this approach.</p>

Diagnosis of induction motor failures using discrete wavelet transform of an auxiliary winding voltage

“…The determination of the auxiliary winding voltage is the main key of this approach. Monitoring this signal is extremely beneficial to achieve an efficient diagnosis of the squirrel cage induction machine [24], [25]. This technic was applied previously for a wound rotor induction machine [26], [27].…”