Effect of the position and the number of broken bars in an Asynchronous Motor Stator Current Spectrum

Abstract

The asynchronous motor has an interest in applications of strong powers requiring the variation speed. However, it is not, like any other electric machine, safe from a dysfunction in consequence of failure of an electrical or mechanical nature. Among these rotor defects, we can quote a fissure or a total break of bar, a rupture of end ring circuit, an eccentricity of the rotor axis... In this paper, we use a technique based on the spectral analysis of stator current in order to detect a break down or a defect in the rotor. Thus, the number and the position effect of the breaks has been highlighted. The effect is highlighted by considering the machine supplied directly through a balanced three-phase network. Index Terms- broken rotor bar, asynchronous motor, modeling, diagnostic, broken bars position, stator current.