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Design and Fabrication of Long-Lasting Inductors. Prevention of Coil Failures.
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Systematic analysis of induction coil failures. Part 14: Split-return inductors and butterfly inductors

Author: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 3/1/2009

The main considerations when choosing an inductor style are the shape of the part, the desired heat-treat pattern, and the material handling to be used for production (i.e., how the part is moved into the coil or the coil indexes into the part, whether rotation of the part is required, or how is the part transferred after heat treatment). Over the years, induction practitioners have established a family of special or specialty inductors. Common names have been coined to describe their appearance or function, such as pancake, channel, hairpin, split-return, and butterfly inductors [1]. This column is devoted to the analysis and prevention of failures of split-return and butterfly-type inductors.

Systematic analysis of induction coil failures. Part 13: Electromagnetic proximity effect

Authors: Valery Rudnev
Publication: Heat Treating Progress, Professor Induction Series
Date: 10/1/2008

This article is one of series of articles devoted to a systematic scientific/engineering analysis of failures of induction heating coils and prevention. Electromagnetic proximity effect has a strong influence not only on heating/hardening patterns and unexpected pattern shift but it also effects a coil life being responsible for localized hot spots, copper overheating, degradation, arcing and even melting. Case studies of prevention of premature coil failure due to electromagnetic proximity effect is provided in this article.

Systematic analysis of induction coil failures. Part 12: Inductors for heating internal surfaces.

Authors: Valery Rudnev
Publication: Heat Treating Process, Professor Induction Series
Date: 7/1/2008

This article is one of series of articles devoted to a systematic scientific/engineering analysis of failures of induction heating coils and prevention. Four of the most typical coil failure modes when induction heating internal surfaces of a workpiece (for example, holes or inside diameters)are discussed here. Induction heating of internal surfaces of a workpiece can be used in such applications as hardening, tempering, annealing, shrink fitting, stress relieving, brazing, and others. Ways to prevent premature coil failures and making robast and long-lasting internal inductors are discussed here as well.

Systematic analysis of induction coil failures. Part 11c: Frequency selection

Authors: Valery Rudnev
Publication: Heat Treating Process, Professor Induction Series
Date: 1/1/2008

This article is one of series of articles devoted to a systematic scientific/engineering analysis of failures of induction heating coils and prevention. Frequency selection not only affects the performance of the induction system but it also has a significant effect on coil life. Choice of an improper frequency is the most common mistake made by developers and users of induction heating processes. Frequency selection has the detrimental effect on coil life of choosing an improper frequency for induction through-heating applications (including through hardening, annealing, normalizing, and heating prior to hot and warm forming, for example) is the topic of this column and two others in the "Systematic analysis of induction coil failures" series.

Systematic analysis of induction coil failures. Part 11b: Frequency selection.

Authors: Valery Rudnev
Publication: Heat Treating Process, Professor Induction Series
Date: 9/1/2007

This article is one of series of articles devoted to a systematic scientific/engineering analysis of failures of induction heating coils and prevention. Frequency selection not only affects the performance of the induction system but it also has a significant effect on coil life. Choice of an improper frequency is the most common mistake made by developers and users of induction heating processes. Frequency selection has the detrimental effect on coil life of choosing an improper frequency for induction through-heating applications (including through hardening, annealing, normalizing, and heating prior to hot and warm forming, for example) is the topic of this column and two others in the "Systematic analysis of induction coil failures" series.

Systematic analysis of induction coil failures. Part 11a: Frequency selection.

Authors: Valery Rudnev
Publication: Heat Treating Process, Professor Induction Series
Date: 7/1/2007

This article is one of series of articles devoted to a systematic scientific/engineering analysis of failures of induction heating coils and prevention. Frequency selection not only affects the performance of the induction system but it also has a significant effect on coil life. Choice of an improper frequency is the most common mistake made by developers and users of induction heating processes. Frequency selection has the detrimental effect on coil life. An effect of choosing an improper frequency for induction through-heating applications (including through hardening, annealing, normalizing, and heating prior to hot and warm forming, for example) is the topic of this column and two others in the "Systematic analysis of induction coil failures" series.

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