There is a little known failure mechanism that affects dc coils, particularly those used in low-side-switched circuits. This mechanism involves electrolytic transport of copper from the winding in conjunction with chemical corrosion. For this phenomenon to occur, several conditions must exist simultaneously. This article discusses the conditions under which such failures occur and explains how to minimize their effects if not prevent them.
This content is only available as a PDF.
Copyright © ASM International® 2001