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Catalog of Failed Wire Ends


 Coil failures can often be traced to an electrically open wire. In practice, coil wire breaks are the result of two or more failure mechanism acting together or in sequence. This article discusses the characteristics of different failure mechanisms and explains how to recognize them during analysis. Scanning electron micrographs of failed copper-wire ends presented in this article may be used as a guide in pinning down the cause of open-wire coil failures.