Analysis and modeling on the induction machine faults

To obtain high performance and high safety degree in induction machine operation, the researchers´ attention is directed through monitoring and evaluating their reliability. This paper analyzes the connection between the failure causes and their effects on induction machine, by using Failure Mode and Effects Analysis (FMEA) and Fault Tree Analysis (FTA). The first method identifies possible faults in induction machine operation and assesses their consequences on the entire electric system, while the second one is a logical and graphical method used to assess the failure probability. These methods are applied in a case study on the induction machines produced by a Romanian company. The faults that appear in the manufacturing phase for the induction machine with powers in the range of 0.75-1.5 kW are monitored and analyzed. Based on experimental data, the faults space for the induction machine is modeled and the failure rate & probability of failure for this electrical system are established. The case study is useful for determining weaknesses of the induction machine, based on which the optimization of manufacturing procedures can be done.