Inter-turn short-circuit analysis in an induction machine by finite elements method and field tests

Modern industry requires reliability in the continuous operation of the electric motors which requires the use of predictive maintenance techniques. Present commonly used techniques consist in offline test that involves stopping the electrical motor and taking measurements to detect faults [1] [2] [3]. The fault detection methods are based on symptoms generated from the fault condition, and these symptoms are evaluated by testing offline or through signals obtained from the machine [3] [4]. The finite element method FEM has proved to be a valuable tool in determining the presence of failure symptoms and the establishment of its severity levels, obviating the need for laboratory tests that are often harmful for the same machine [5][6]. The negative sequence parameters analysis and the Extended Park Vector Approach, with the evolution of short-circuit turns of the stator phase winding in a 3HP induction machine was done in this paper by using field tests and FEM computer simulations.