In this paper, the cyclostationary characteristics of electrical signals will be
exploited in order to detect the rotor faults of an asynchronous machine. These defects
are the most complex in terms of detection since they interact with the 50 Hz carrier with
a weak band occupied in frequency. The testing ground used includes an industrial
three-phase wound rotor asynchronous motor of 400 V, 6.2 A, 50 Hz, 3 kW, 1385 rpm
characteristics. The rotor fault has been carried out by adding an extra 40 mΩ resistance
on one of the rotor phases (i.e. 10% of the rotor resistance value per phase,
Rr = 0.4Ω). From the stator voltage and
current acquisition, and by application of the Time Synchronous Averaging (TSA) method to
the stator current, the electrical signal will be conditioned in order to obtain a
sensitive indicator allowing to easily distinguish the healthy cases from defective ones.