Talk:Terfenol-D

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Military history: Technology Start‑class

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Untitled[edit]

This page was voted on for deletion at Wikipedia:Votes for deletion/Terfenol. The final result was Redirect to Terfenol-D. --Death phoenix 04:30, 11 Mar 2005 (UTC)

Wiki Education Foundation-supported course assignment[edit]

This article was the subject of a Wiki Education Foundation-supported course assignment, between 5 September 2018 and 20 December 2018. Further details are available on the course page. Student editor(s): Marino20. Peer reviewers: Amarino789, Dimitri Lampes.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 10:52, 17 January 2022 (UTC)[reply]

Video that refers to the substance[edit]

This video at a point 34 or 35 minutes into the presentation states that Terfenol-D is extremely expensive, can be used for perturbing the strengths of a magnetic field by having it painted in a pattern onto a disk which is then rotated in front of a magnet in proximity to a pickup coil. The coil will receive a varying strength magnetic flux from the nearby magnet, and in doing so induces AC electromotive force (Voltage) into the pickup coil. Presumably virtually no forces are exerted upon the disk so rotating the disk requires little effort, yet the modulation induced in the magnetic field going into the coil is huge, producing good energy output from the coil. The disk could be rotated by wind via rotor, or whatever sized small motor required to spin the light weight disk.

Is there some source of info about how much this stuff costs?
Where it is manufactured?
Is it patented?
Are there consumer applications in use that employ these methods?
Does a RS that talk about these applications that could be mentioned in the article? Oldspammer (talk) 07:55, 2 July 2011 (UTC)[reply]

At a point 49m:00s into the video, an energy generation device prototype is shown that spins a Terfenol-D painted 33.3 RPM vinyl disk with holes cut in it that modulates the magnetic field going into a set of coils mounted statically on the top layer. The person narrating the image gives the size of the small motor that rotates the disk that is in the few milliwatts range. The device presumably generates a few kilowatts. The Terfenol-D paint required supposedly costs more than $3,000 (possibly per coil with 8 coils) mentioned somewhere earlier in the video. (If $3k per coil, that is $24k for the prototype device just for the Terfenol-D paint alone?) Oldspammer (talk) 08:33, 2 July 2011 (UTC)[reply]

External links modified[edit]

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