Reliability analysis for DC motors under voltage step-stress scenario

Abstract

In reliability analysis, different stress techniques are used to know the lifetime and performance of electrical devices via accelerated life testing. One of these stress technique is the step stress, which combines the traditional reliability testing and over-stress testing; with this method, it is easy to obtain the failure time in a short time. Nonetheless, the analysis of step-stress data can be difficult, and the specialist has usually have to trust on shortcuts or estimations to obtain reliability information from step-stress data. In this paper, a model based on Weibull distribution, inverse power law, cumulative damage model and step-tress technique is proposed to analyze the behavior of electronic devices under a voltage step-stress scenario. The parameters of the model were analyzed via a maximum likelihood. A case of study is based on DC motors is presented in this paper. The results obtained in this paper helped to design department in order to improve the lifetime and performance of the device under analysis.