Comprehensive computations of the response of faulty cage induction machines

Abstract

This paper presents the results from extensive computations of the vibrations as well as other relevant quantities of a cage induction machine under different fault conditions, i.e. broken bar, static, and dynamic eccentricity, stator windings turn short-circuit and short-circuit in the core of the stator. The 2D finite element method is adopted for both mechanical and electromagnetic analysis, where the circuit equations of the windings are also included. The computation results are compared with measurements made on a test bench. The comparison of the computation results from healthy and faulty machines shows that the combination of vibrations with either current or phase voltages leads to a better segregation between the different faults. It shows also that the low frequency components are usually enough to monitor. This result is of significance when designing the diagnosis and monitoring system of induction machines.