Experimental and analytical approaches for investigating low-level inter-turn winding faults in induction machine

Inter-turn winding fault is one of the defects which are said to be an evolving fault. Therefore it is very important to be able to detect it as soon as possible to avoid the ultimate fault that can lead to stop the machine. Indeed, a motor with a few turns in short circuit can operate. Nevertheless, maintenance must be programmed as quickly as possible to avoid the complete destruction of the winding but also the break of the machine. Aims of the preventive maintenance are both to keep equipment and prevent downtime but also to reduce expensive costs due to this fault. Firstly, we propose an analytical and experimental study of the detection of the inter-turn fault. Finally, an analysis of their effects on an induction machine is developed. This degradation can be modeled with a resistor called the contact resistor. Several values of this contact resistor are studied theoretically and experimentally to analyze their effects on detection. The analytical and the experimental studies are carried out on a 0.25 kW induction machine with 2.5% of inter-turn fault at one phase of the stator winding.

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